SURFACE VEHICLE STANDARDJ826 NOV2008 Issued Revised 1962-11 2008-11 Superseding J826 MAR2008 Devices for Use in Defining and Measuring Vehicle Seating Accommodation RATIONALE The March 2008 revision incorporated an inspection procedure for checking calibration of the H-point machine (Appendix C). It also added specifications for the mounting surface of the head restraint measuring device. Other changes included: - 10 year phase-out period for the HPM - Revision of HPM weight specification from 167 to 169.6 lb to reflect current HPM build - New ambient humidity specification - Narrower range of ambient test temperatures - Clarification of muslin cloth specification - Extensive revision of short couple method and addition of long couple method to Appendix A - Terminology consistent with SAE J1100 - Editorial clarifications This revision adds a check for knee and ankle rotation efforts to Appendix C. It also corrects an error in the specification for the H1 divot rearward to the vertical angle block surface. In addition, the length of the optional CAD shoe was changed from 200 to 203 mm to align with the current shoe length. A few other minor editorial changes were made to the text and to Figure A4. SAE J4002 (HPM-II) and SAE J826 (HPM) shall co-exist for a transition period of at least 10 years, preferably no longer, from the first publication date of SAE J4002 (August 2005). Following this transition period SAE J826 will be withdrawn. During the transition period, it remains up to the vehicle designers to decide which HPM to use. Regulatory bodies and other parties that need to know shall be informed regarding which HPM was used. __________________________________________________________________________________________________________________________________________ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefrom, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. Copyright © 2008 SAE International All rights reserved. No part of this publication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: 724-776-4970 (outside USA) Fax: 724-776-0790 Email:
[email protected] http://www.sae.org SAE WEB ADDRESS: Uncontrolled copy when printed SAE J826 Revised NOV2008 TABLE OF CONTENTS -2- 1. 1.1 2. 2.1 2.1.1 2.2 2.2.1 3. 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 4. 4.1 4.2 4.3 4.3.1 4.3.2 4.3.3 4.3.4 4.3.5 4.3.6 4.3.7 4.4 4.4.1 4.4.2 4.4.3 5. 5.1 5.2 5.3 6. 7. 8. SCOPE.......................................................................................................................................................... 3 Purpose......................................................................................................................................................... 4 REFERENCES.............................................................................................................................................. 4 Applicable Publications ................................................................................................................................. 4 SAE Publications........................................................................................................................................... 4 Related Publications ..................................................................................................................................... 4 SAE Publications........................................................................................................................................... 4 DEFINITIONS ............................................................................................................................................... 4 Accelerator Heel Point, AHP......................................................................................................................... 4 Ankle (Foot) Angle, A46................................................................................................................................ 4 Ball of Foot, BOF........................................................................................................................................... 4 Cushion Angle, A27 ...................................................................................................................................... 5 Floor Reference Point, FRP.......................................................................................................................... 5 H-Point .......................................................................................................................................................... 5 Heel of Shoe ................................................................................................................................................. 5 Hip Angle, A42 .............................................................................................................................................. 5 Knee Angle, A44 ........................................................................................................................................... 5 Seating Reference Point, SgRP.................................................................................................................... 5 Shoe Plane.................................................................................................................................................... 5 Thigh Centerline............................................................................................................................................ 5 Thigh (Cushion) Line..................................................................................................................................... 5 Torso (Back) Angle, A40............................................................................................................................... 5 Torso Line ..................................................................................................................................................... 5 H-POINT TEMPLATE—DESCRIPTION, APPLICATION, AND POSITIONING PROCEDURE .................. 5 Description .................................................................................................................................................... 5 Application—Aids in displaying the following:............................................................................................... 5 Positioning Procedure for physical template (Figure 1)................................................................................ 5 Torso positioning for any specified Seating Reference Point and torso angle............................................. 5 Front Seat—Driver Position .......................................................................................................................... 6 Front Seat—Driver Position .......................................................................................................................... 6 Second Row—Left Side Occupant Position ................................................................................................. 6 Third Row—Left Side Occupant Position—Forward Facing......................................................................... 7 Third Row—Left Side Occupant Position—Rearward Facing ...................................................................... 7 H-point template layout using data obtained during H-point machine installation........................................ 7 Positioning Procedure for CAD template (Figure 2) ..................................................................................... 7 Use of optional shoe bottom ......................................................................................................................... 7 Positioning for any specified Seating Reference Point and torso angle....................................................... 7 Positioning for an unknown Seating Reference Point and torso angle. ....................................................... 8 H-POINT MACHINE—DESCRIPTION, APPLICATION, AND INSTALLATION PROCEDURE................... 8 Description .................................................................................................................................................... 8 Application................................................................................................................................................... 10 Installation Procedure ................................................................................................................................. 10 SHORT-COUPLED SEATING CONDITION............................................................................................... 13 LONG-COUPLED SEATING CONDITION ................................................................................................. 13 DETERMINATION OF CUSHION ANGLE ................................................................................................. 13 Uncontrolled copy when printed SAE 9. 10. 11. 11.1 APPENDIX A APPENDIX B APPENDIX C APPENDIX D FIGURE 1 FIGURE 2 FIGURE 3 FIGURE 4 FIGURE A1 FIGURE A2 FIGURE A3 FIGURE A4 FIGURE B1 FIGURE C1 FIGURE C2 FIGURE C3 FIGURE C4 FIGURE C5 FIGURE C6 FIGURE C7 TABLE 1 TABLE C1 J826 Revised NOV2008 -3- H-POINT MACHINE AND TEMPLATE FABRICATION.............................................................................. 13 CALIBRATION OF THE H-POINT MACHINE ............................................................................................ 13 NOTES........................................................................................................................................................ 14 Marginal Indicia ........................................................................................................................................... 14 INSTALLATION PROCEDURE FOR SHORT- AND LONG-COUPLED SEATING ................................... 15 DETERMINATION OF CUSHION ANGLE ................................................................................................. 19 SAE J826 H-POINT MACHINE CALIBRATION INSPECTION .................................................................. 21 HEAD RESTRAINT MEASURING DEVICE (HRMD) ................................................................................. 32 H-POINT TEMPLATE ................................................................................................................................... 6 CAD VERSION OF H-POINT TEMPLATE ................................................................................................... 8 H-POINT MACHINE...................................................................................................................................... 9 H-POINT MACHINE...................................................................................................................................... 9 OVERVIEW OF SHORT-COUPLE CONDITION METHOD ‘A’.................................................................. 15 OVERVIEW OF SHORT-COUPLE CONDITION METHOD ‘B’.................................................................. 16 OVERVIEW OF LONG-COUPLE CONDITION .......................................................................................... 17 DECISION TREE FOR COUPLE METHODS - 2-D TEMPLATE PLACEMENT FOR 2nd TO Nth ROW................................................................................................................................................ 18 DISTRIBUTION OF WEIGHTS FOR CUSHION ANGLE MEASUREMENT.............................................. 20 MEASUREMENT COORDINATE SYSTEM FOR HPM PANS .................................................................. 22 HPM TORQUE ADJUSTMENT. SOME HPMS MAY DIFFER FROM THIS ILLUSTRATION. .................. 23 HPM CUSHION AND BACK PAN SETUP ................................................................................................. 24 HPM CUSHION AND BACK PAN MEASUREMENTS ............................................................................... 25 LEG AND SHOE SETUP ............................................................................................................................ 27 ANKLE AND KNEE JOINT EFFORT CHECK ............................................................................................ 27 HPM WEIGHTS .......................................................................................................................................... 28 LEG SEGMENT LENGTH .......................................................................................................................... 10 HPM DIMENSIONS AND TOLERANCES (ITEM NUMBERS IDENTIFY A MEASUREMENT SHOWN IN FIGURES C1-C7) .................................................................................................................... 29 1. SCOPE The devices of this SAE Standard provide the means by which passenger compartment dimensions can be obtained using a deflected seat rather than a free seat contour as a reference for defining seating space. All definitions and dimensions used in conjunction with this document are described in SAE J1100. These devices are intended only to apply to the driver side or center occupant seating spaces and are not to be construed as instruments which measure or indicate occupant capabilities or comfort. This document covers only one H-point machine installed on a seat during each test. Certified H-point templates and machines can be purchased from: SAE International 400 Commonwealth Drive Warrendale, PA 15096-0001 Specific procedures are included in Appendix A for seat measurements in short- and long-coupled vehicles and in Appendix B for measurement of the driver seat cushion angle. Specifications and a calibration inspection procedure for the H-point machine are given in Appendix C. Additional considerations are necessary when a Head Restraint Measuring Device (HRMD) is mounted to an H-point machine (Appendix D). Uncontrolled copy when printed "A 2-D Manikin—The Inside Story". publications shall apply. A46 Ball of Foot. Paper 267A presented at SAE International Congress. 3. BOF Uncontrolled copy when printed .1 Applicable Publications The latest issue of SAE The following publications form a part of this specification to the extent specified herein.sae.SAE 1. 2. REFERENCES 2.2 3.org.2 Motor Vehicle Fiducial Marks and Three-Dimensional Reference System Motor Vehicle Dimensions Related Publications The following publications are provided for information purposes and are not a required part of this document.1. SAE J1516 SAE J1517 SAE J2732 SAE J4002 Accommodation Tool Reference Point Driver Selected Seat Position Motor Vehicle Seat Dimensions H-Point Machine (HPM-II) Specifications and Procedure for H-Point Determination—Auditing Vehicle Seats H-Point Machine (HPM-II)—Procedure for H-Point Determination—Benchmarking Vehicle Seats Positioning the H-Point Design Tool—Seating Reference Point and Seat Track Length SAE J4003 SAE J4004 S. added explanation is provided. January 1961 3. PA 15096-0001. When appropriate. Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA). DEFINITIONS The following terms are defined in SAE J1100. Warrendale.1 3. PA 15096-0001.1 SAE Publications Available from SAE International. Warrendale. www. Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA). 2.2. www. SAE J182 SAE J1100 2. 2. Geoffrey. P.1 SAE Publications Available from SAE International.1 Purpose J826 Revised NOV2008 -4- This document specifies a two-dimensional H-point template and a three-dimensional H-Point Machine (HPM) for use in defining and measuring accommodation in vehicle seats. AHP Ankle (Foot) Angle.org. 400 Commonwealth Drive.sae. Detroit. 400 Commonwealth Drive.3 Accelerator Heel Point. 2 • • • 4. and development stages of any new vehicle.5 3. H-POINT TEMPLATE—DESCRIPTION. A42 Knee Angle. A401 3. Individual torso.14 Torso (Back) Angle.4 Cushion Angle. AND POSITIONING PROCEDURE 4. A torso angle reference bar is included to orient the template’s torso in relation to the vertical. A44 3. Data obtained from checks made with the H-point machine.12 Thigh Centerline 3. 1 Prior to 2008 SAE standards generally used the term “back angle” to describe the A40 dimension of SAE J1100. 4.1 Application—Aids in displaying the following: Passenger compartment space and seating attitude during conception. 3.13 Thigh (Cushion) Line 3.3.7 3.1. Passenger compartment space and seating attitude for comparison and reporting purposes.3 4. Cushion Angle is measured using the H-point machine with the lower legs removed and the torso weights redistributed about the cushion pan.SAE 3.8 3. Position the H-point of the H-point template on the Seating Reference Point (SgRP) location on the layout.1 4.9 Heel of Shoe Hip Angle.10 Seating Reference Point. Uncontrolled copy when printed .6 Floor Reference Point. and shoe segments are provided with locking pivot joints which can be used to fix the angular relationships of the segments. thigh. APPLICATION. Positioning Procedure for physical template (Figure 1) Torso positioning for any specified Seating Reference Point and torso angle. FRP H-Point The H-point is located on the centerline of the H-point machine midway between the H-point sight buttons on either side of the machine. (See Section 5). engineering.11 Shoe Plane 3. SgRP 3.15 Torso Line 4.1 Description The H-point template (Figure 1) is constructed to represent in profile an adult male wearing shoes and corresponds to the profile of the deflected seating contour of the H-point machine. New or revised standards beginning in 2008 will use the term “torso angle” for this dimension. lower leg. A27 J826 Revised NOV2008 -5- See Appendix B. 3.3. rotate the shoe forward until the bottom of the shoe contacts the undepressed accelerator pedal without infringing upon the 87 degrees minimum ankle (foot) angle. However.3.1. Front Seat—Driver Position 4.3.2 4.4 Leg and shoe positioning with the front seat in its SgRP position.3.2 Set the torso angle reference bar quadrant scribe line marked on the torso angle quadrant to the specified torso angle.1 Holding the torso portion of the template in position as outlined in 4. Second Row—Left Side Occupant Position 4.3.SAE J826 Revised NOV2008 -6- FIGURE 1 .3. Front Seat—Driver Position 4. Holding the heel point at the specified location.3. Normally the pedal contact point is at or below the shoe ball of foot.3.1 to 4.3.3. 4.3 4. position the heel point of the template at the specified heel point location.1.2.2 Leg and shoe positioning for any specified Accelerator Heel Point location. 4.1 to 4.3 Leg and shoe positioning for any specified undepressed accelerator pedal location. The undepressed accelerator pedal (point of contact with the bottom of shoe or shoe plane) may be determined by locating the heel point as described previously and presetting and locking the ankle angle to 87 degrees. position the bottom of the shoe on the specified undepressed accelerator pedal and the heel as far forward as allowable.3. This point on the layout is located on top of the heel pad or the depressed floor covering surface at the Y-plane centerline of the accelerator pedal. Uncontrolled copy when printed .2.1.H-POINT TEMPLATE 4.1 Holding the torso portion of the template in position as outlined in 4.3. Lock ankle angle quadrant.1.2.3.3 4.1.3. the ankle angle is never less than 87 degrees.3. Position the vertical reference scribe lines on the torso angle reference bar parallel to the body grid lines on the layout drawing.3.3. Lock this quadrant in place.1. 7.1 to 4. 4. Follow the procedure as outlined in 4.5.2 Uncontrolled copy when printed . NOTE: Locating the shoe either side of the Y-plane centerline of the occupant position will make the shoe location compatible to the shoe location in the existing H-point machine installation procedure.6 4.1 4.4.1 to 4.3. lower leg.7. There is no heel pocket.2 4.3. Use values for SgRP and torso angle that are either specified by the manufacturer or can be determined from SAE J4004 or SAE J1516/SAE J1517. The bottom of the shoe should be touching the undepressed accelerator pedal.3.2 Move the shoe forward along the depressed floor covering line to the nearest interference of the toe.1 4. lock the ankle angle at 87 degrees.1.3. instep.3.3.1 Positioning Procedure for CAD template (Figure 2) Use of optional shoe bottom The standard H-point template has a shoe with an arched bottom and a defined heel shape.1. Positioning for any specified Seating Reference Point and torso angle. the heel of shoe may be placed at the manufacturer AHP with the bottom of the shoe touching the pedal.7 4.1 J826 Revised NOV2008 -7- Holding the torso portion of the template in position as outlined in 4.2.1 4. or knee with the front seat. Lock this quadrant in place.2. Third Row—Left Side Occupant Position—Forward Facing Follow the procedure as outlined for the second row seat. Holding the torso portion of the template in position as outlined previously. as shown in Figure 2. move the upper leg segment to the measured hip angle shown on the hip angle quadrant. position the ankle pivot center on an arc from the hip pivot center equal to the measured effective leg room less 254 mm.5 4. place the bottom of the shoe (heel and ball) on the depressed floor covering line. Alternatively.SAE 4.6 4.1. The shoe is to be placed on the Y-plane centerline of the occupant or up to 127 mm (5 in) on either side of the Y-plane centerline on the floor pan section. The ankle angle is to be restricted to a maximum of 130 degrees.3.4.3.7.4. 4.3.3.1 4.3 using the measured torso angle instead of the design torso angle.1 4. Third Row—Left Side Occupant Position—Rearward Facing Follow the same procedure as outlined for the third row—side occupant position—forward facing except that the shoe is positioned in the footwell to the interference with the rear end or closure.1.4.3.5 4. Allowing the knee angle to vary as necessary. H-point template layout using data obtained during H-point machine installation.3.7.3 4.4. except with the template Hpoint on the SgRP of the second row seat.7.4. SAE manikins defined in SAE J4002 (HPM-II) and SAE J4004 (HPD) have a shoe with a flat shoe bottom from the shoe heel to the BOF.4.3.4 4. Position and lock the ankle (foot) angle quadrant to the measured ankle angle. 4.3.3.4 4.3. left side occupant position except that the template is positioned in the third seat compartment. The BOF point on the shoe is 203 mm (8 in) from the heel of the shoe.7. users are strongly encouraged to flatten the shoe bottom of the CAD template.3. As an option to aid in transitioning to these devices.3.2 4. Position the H-point of the CAD template on the SgRP at the specified torso angle.1.6. Position the H-point pivot of the template at the measured H-point location on a layout drawing or grid system. For the driver position. 3 4. Two spirit levels orient the device in space.4. H-POINT MACHINE—DESCRIPTION. Positioning for an unknown Seating Reference Point and torso angle.1 Description The back and cushion pans of the 3-D H-point machine (Figures 3 and 4) are representations of adult male contours2. (See Table 1.3. The remaining dimensions were developed from U. AND INSTALLATION PROCEDURE 5. March. and 95th percentile lengths. Constructed of reinforced plastic and metal. Department of Health. Body segment weights are placed at the center of gravity locations to provide seat penetration equivalent to a 77 kg (169. 50th. 4. Lower leg segments. which is a lateral extension of the adjustable thigh bar. Shoe and ankle assemblies are calibrated to measure the angular relation to the lower leg segment.S. are connected to the cushion pan assembly at the knee joining T-bar.2 5. 1969.3 For passenger positions the shoe should be positioned with the heel of shoe at the floor reference point (FRP) and the bottom of shoe on the floor. attached to the cushion pan. these separate back and cushion pans simulate the human torso and thigh and are mechanically hinged at the H-point. Positive stops are provided in the thigh and lower leg segments for the 10th. Install the CAD template as described in 4. Education. also adjustable in length.SAE J826 Revised NOV2008 -8- FIGURE 2 . A graduated sliding probe is hinged from the H-point to measure the head room in the compartment.CAD VERSION OF H-POINT TEMPLATE 4. shoe plane angle.4.3. establishes the thigh centerline and serves as a baseline for the hip angle quadrant.2. and Welfare data by the Design Devices Subcommittee of the SAE Human Factors Engineering Committee. Uncontrolled copy when printed . The adult male dimensions were in part taken from the 50th percentile data as acquired by Geoffrey. A quadrant is fastened to the probe to measure the torso angle. AHP.2. An adjustable thigh bar. SgRP and torso angle. See SAE J1100 and SAE J4003/SAE J4004 for determining BOF. Quadrants are incorporated in the lower leg segments to measure knee angles.4.4.1 4.6 lb) male.) 2 3 The cushion and back pans of the HPM-II are an improved representation of adult male contours.3 The lower leg and thigh segments are available in 10th.4. APPLICATION. and 95th percentile of adult male dimensions (Table 1). 50th. Install the 3-D H-point machine to determine the seat H-point travel path. H-POINT MACHINE Uncontrolled copy when printed .H-POINT MACHINE FIGURE 4 .SAE J826 Revised NOV2008 -9- FIGURE 3 . 94) .for bench (or other) seats.SAE J826 Revised NOV2008 TABLE 1 .1 456. that is.06) 455. Values for 95th percentile leg lengths of the template were established by comparisons of CMM scans of templates from several manufacturers in 1992. Uncontrolled copy when printed . Place a piece of muslin cotton cloth over the seat area to be checked. "A 2-D Manikin—The Inside Story. seats. C/LO may be aligned with the steering wheel center.381 mm outboard from the vehicle centerline (as a last resort) The C/LO should be moved inboard whenever the H-point machine is sitting far enough outboard that the seat edge will not permit leveling of the H-point machine.2.7 (15.3. C/LO is located at the middle of the head restraint.LEG SEGMENT LENGTH 10th Percentile(1) mm (inches) 50th Percentile(1) mm (inches) 417. should be in the design position.3. S.7 (16. or equivalent. Use 25 degrees if not specified. Curb and gross weight rating loads require different fiducial mark heights. Values for the 95th percentile leg lengths were developed on the basis of best judgment of available data by the Design Devices Subcommittee of the SAE Human Factors Engineering Committee at the July 1968 and March 1969 meetings. It is moved inboard the necessary distance to permit leveling of the H-point machine and the new dimension from centerline of vehicle to C/LO noted in recording measurements. If the seat to be checked has never been sat upon. Detroit.1 5. etc.) All interior dimensions are measured with the front seat in the SgRP position as specified by the manufacturer.2 5. For the driver. C/LO is the centerline of the seat. If specifications are not available.0 Lower leg segment (A) Thigh segment (B) 392. approximately 910 mm square. 3. mid-grade. The muslin should be tucked in a sufficient amount to prevent hammocking of the material.5 (16. locate C/LO as follows: 5. suitable floor covering sections.1 5. record both relative humidity and room temperature.7 (18. a 68 to 79 kg (150 to 175 lb) person shall sit on the seat twice for 1 min to flex the cushion and back.2 5. general-purpose muslin that is available from most fabric stores.3. 2.42) 431. the normal driving or riding torso angle is specified by the manufacturer (A40).99) HPM 95th Percentile(2) mm (inches) 458. 5. Installation Procedure Dimensions are measured relative to the X and Z body zero planes by setting up the vehicle relative to the front and rear fiducial mark (see SAE J182) height (H163 and H164). The muslin cloth should be of sufficient size to prevent the machine from contacting the seat.05) 1. controls.3.4 . Geoffrey. locate C/LO midway between the lap belt anchors. Room relative humidity should be within a range of 50% ± 5%. are to be placed under the H-point machine's shoes. The cushion tilt adjustment. When the seatback has an angular adjustment separate from the seat cushion.46) 407." Paper 267A presented at SAE International Congress.2. If the test is run in a buck.10 - Template 95th Percentile(3) mm 459. relationship of H-point to body structures. All seat assemblies are to remain unloaded for a minimum period of 1/2 h (1 h preferred) prior to the H-point machine installation. If this relative humidity is not met. or individual auxiliary seats. . The muslin should be a plain cotton fabric having a thread count and weight typical of a durable.7 (17.1 (16. P.3 5.2 Application Aid in the design and development of seats and seat materials. (See SAE J1100. .for bucket front seats. January 1961. Place cushion and back assembly of the H-point machine at the centerline of occupant (C/LO). Check vehicle seating compartments for conformance to design specifications. C/LO is also the centerline of H-point machine and is located in vehicle per manufacturer specifications. if available. seats with defined bolsters. Room temperature shall be 19 to 26 °C (66 to 79 °F).3 5. If a head restraint is not fitted. Sufficient time (at least 4 h) shall be allowed to ensure that the seat material reaches room temperature. tunnel width. unless otherwise specified by the manufacturer.1 The right shoe and leg assembly is placed on the undepressed (blocked or mechanically restrained) accelerator pedal with the sole of the shoe on the pedal and the heel as far forward as allowable. Tilt the back pan forward against the forward stop and draw the H-point machine away from the seatback using the T-bar. . Tunnel contact at the heel is defined where the Heel Point on the shoe is at the beginning transition of horizontal to upturned compressed carpet surface.2 Front Seat—Occupant in Vehicle Centerline Position The H-point machine is installed in the front seat vehicle centerline position with both legs extended at the specified percentile.3. instep.8 5.7 The shoe and leg positions of the H-point machine for the various individual seat positions to be checked are as follows: Front Seat—Driver Position 5. in order to clear lateral obstructions. or lower leg with the front seat. In vehicles having no tunnel. see Section 6 and Section 7.3. instep. The T-bar lateral segment should be parallel to the ground and perpendicular to the Y-plane of the vehicle unless otherwise specified by the manufacturer. such as seat belt anchors. and placed astride the tunnel.3 Second and Successive Seats—Side Occupant Position The H-point machine is installed in the second seat outboard occupant position at the C/LO as described in 5.3. 5. the one with the farthest interference will be used for dimensioning purposes.7.7.3. the T-bar may be extended. The left shoe is positioned on the floor or toe pan and located approximately the same distance to the left of the H-point machine centerline as the right shoe is to the right. or lower leg with the front seat.3. approximately opposite and symmetrical in a manner that levels the knee joint Tbar.) The two shoes are placed together.3.3. either individually at the knee joint or by using the T-bar lateral segment and lower leg assembly. The right leg is adjusted inboard on the Tbar toward the centerline of the vehicle until just contacting the tunnel (or other components) or until the Ball of Foot on the shoe is aligned with the center of the accelerator pedal pad unless specified otherwise by the manufacturer.SAE 5. (Check applicable seating arrangement drawing for specified location. see Appendix A.6 J826 Revised NOV2008 Use 95th percentile leg and thigh segments specified in Table 1. The left shoe is placed on the undepressed accelerator pedal and the right shoe is located to the right of the tunnel. one on either side of the tunnel. the shoes are set approximately 254 mm (10 in) apart. If necessary. the ankle angle is never less than 87 degrees. 5. The 87 degree limit can be fixed by inserting the pin into the shoe assembly. or up to 127 mm (5 in) to either side of C/LO. Reposition the H-point machine on the seat by one of the following methods: Uncontrolled copy when printed . and positioned to the nearest interference of the toe. set the H-point machine's shoes approximately 254 mm (10 in) apart. The heel may not be placed on the toe board.. The T-bar should be maintained parallel to the ground.coupled seating conditions.7. Both leg assemblies are extended to the nearest interference of the toe.3.5 5.and long. A T-bar extension may be required to straddle the knee segments on either side of the tunnel. For a description of short. However. if present.9 Apply lower leg and thigh weights and level the H-point machine.11 - Attach shoe and lower leg assemblies to the cushion pan assembly.7. In vehicles with no tunnel. 5.3. For additional H-point machine leg location conditions and restrictions. The leg comfort angles are determined from the H-point machine's left leg.4 Second and Successive Seats—Occupant in Vehicle Centerline Position The H-point machine is installed in the second seat-vehicle centerline position with both the shoe and lower leg assemblies on the normal floor. In instances where one shoe reaches interference before the other. etc.4. 5. 5.3. 5. Due to the movement of the shoes during the H-point machine rocking operation. use the following procedure: Slide the H-point machine rearward by a horizontal rearward load applied at the T-bar until the cushion pan contacts the seatback. the shoes are repositioned as follows: a. 5. b.3. proceed as follows: a. Alternately apply and release this force until the hip angle readout indicates that the back pan has reached a stable position after the applied force has been released. the seat assembly should remain unloaded for a minimum period of 1/2 h prior to the rerun.11 Install the right and left buttock weights and then alternately the eight torso weights. Force sufficient to increase the hip angle by 3 degrees. rotate the back pan forward. repeated identical hip angle readouts.3. and if the shoes change position. 66 N (15 lb).1 J826 Revised NOV2008 . therefore.9. Uncontrolled copy when printed . During this lifting. 5. use the following procedure: Allow the H-point machine to slide rearward until a forward horizontal restraining load on the T-bar is no longer required due to the cushion pan contacting the seatback. This operation releases any accumulated shoe friction and movement incurred during the lateral rocking step. Maintain H-point machine level. If the H-point machine does not tend to slide rearward.13 Holding the T-bar to prevent the H-point machine from sliding forward on the seat cushion. that is. apply a sufficient lateral load to the top of the back pan to level the H-point machine cushion pan on the seat. Front Seat—Alternately lift each shoe off the floor the minimum necessary amount until no additional forward shoe movement is obtained. Care shall be exercised in holding the T-bar and rocking the H-point machine to minimize inadvertent exterior loads applied in a vertical or fore-and-aft direction. the T-bar must be restrained and properly aligned by applying an appropriate lateral load during the rocking motions. If an H-point machine level adjustment is necessary. the heel is to be in contact with the floor and the ball (sole) of the foot is to be in contact with the floor.12 - If the H-point machine tends to slide rearward. the T-bar of the H-point machine may tend to change from the specified horizontal and vertical alignment. or undepressed accelerator pedal.SAE 5. or 2. When each shoe is placed back in the down position.3. b. and repeat the H-point machine back rocking. The direction of load application should be maintained along a line from the above intersection to a point just above the thigh bar housing. Then carefully return the back pan to the seatback. Care shall be exercised to minimize exterior downward or side forces applied to the H-point machine.3.3.9. 5. sliding the shoes forward until the shoe or leg interfere with the rear of the front seatback.10 Apply a 10 kg (22 lb) load twice to the back and pan assembly positioned at the intersection of the hip angle quadrant and the T-bar housing (Figure 3). the shoes are to be free to rotate and no forward or lateral loads are to be applied. Second and Successive Seats—Alternately move each shoe forward by applying a forward load to the heel of the shoe. The H-point machine's shoes are not to be restrained or held during this step.3.2 5.14 If a rerun of the H-point machine installation is desired. Care must be exercised through the remainder of the procedure to prevent the H-point machine from sliding forward. Return the back pan to the seatback. toe board.3.12 Tilt the back pan forward until the stop is contacted. Rock the H-point machine from side to side over a 10 degree arc (5 degrees to each side of the vertical centerline) for three complete cycles to release any accumulated friction between the H-point machine and the seat. The loaded H-point machine should not be left on the assembly longer than the time required to perform the test. they should be allowed to remain in that attitude at this time. Apply a rearward force perpendicular to the torso angle bar just above the torso weights using the smaller of the following forces: 1. If the cushion pan is not level at the completion of this step. re-level. During the rocking. 5. Two levels of calibration are envisioned: 1. DETERMINATION OF CUSHION ANGLE A measure called cushion angle has been developed to determine the attitude that a seat cushion imposes on the seated occupant's thighs independent of seating package geometry. Much like the torso angle reflects the torso attitude imposed by the seat back on the three-dimensional H-point machine. is given in Appendix C. The cushion angle measurement procedure is presented in Appendix B.1 Each H-point machine must have a permanently attached identification plate showing the following information: Three-Dimension H-Point Machine No. together with specifications and tolerances for the various measurements. 9. 7.13 - 6.2 Three H-point template leg segments are available duplicating 10th. one or more components of the assembled HPM interferes with the preceding row seat or structure). is such that the H-point machine with 95th percentile leg lengths will attain an ankle angle greater than 130 degrees with the preceding row positioned at its SgRP location and attitude (that is. or seating package. 9. the foot to lower leg relationship is not limited by the preceding row seat component or other structure). install the machine in accordance with the method described in Appendix A. CALIBRATION OF THE H-POINT MACHINE A procedure for inspecting the HPM for calibration. install the machine in accordance with the method described in Appendix A. the H-point machine thigh attitude depends on the seating package arrangement because the machine's shoe location in the package sets the angle of the lower leg and thigh. ________________ This measuring device is constructed in full accordance with the SAE International Standard SAE J826 specifications. 50th. 8. Conventional use of the HPM for H-point determination 2. SHORT-COUPLED SEATING CONDITION If the H-point couple distance is such that the H-point machine with 95th percentile leg lengths will not fit into a second or successive row seat with the preceding row positioned at its SgRP location and attitude (that is. calibrations of HPMs by an SAE sanctioned agency will include a report on these measurements. Use of the HPM in conjunction with a Head Restraint Measuring Device (HRMD) for the purpose of assessing head restraint geometry (Appendix D) A certification label on the HPM will indicate its level of calibration. This measure uses the H-point machine with lower legs removed and the torso weights redistributed about the seat pan. Normally. 9. Beginning in 2008. Neither torso angle nor cushion angle depend on the particular seating package geometry. and 95th percentile leg lengths of the H-point machine. LONG-COUPLED SEATING CONDITION If the H-point couple distance.SAE J826 Revised NOV2008 . 10. Uncontrolled copy when printed . cushion angle reflects the thigh attitude imposed by the seat cushion. H-POINT MACHINE AND TEMPLATE FABRICATION Fabrication of the H-point machine and the H-point template must conform to design as specified in the SAE International Standard SAE J826 specifications. including technical revisions. NOTES 11. nor in documents that contain editorial changes only.14 - A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical revisions. Change bars and (R) are not used in original publications. not editorial changes.SAE 11.1 Marginal Indicia J826 Revised NOV2008 . have been made to the previous issue of this document. PREPARED BY THE SAE HUMAN ACCOMMODATION AND DESIGN DEVICES STANDARDS COMMITTEE Uncontrolled copy when printed . An (R) symbol to the left of the document title indicates a complete revision of the document. or long-coupled if seating conditions exist as described in Sections 6 or 7.3.3. Use Method A if the HPM shoe can be placed on the floor between the seating rows without interfering with any vehicle component. see A. Use Method B if the HPM shoe cannot be placed on the floor between the seating rows. Follow the installation procedure through 5. respectively.3. Slide the lower leg and shoe forward on the floor until it is obstructed by the seat cushion or support structure and mark a lateral line at the rear of the heel point. L48. effective leg room. or by physical means.12. and following the SAE J1100 procedure. g. is determined by measuring the diagonal distance from the ankle pivot center to the H-point plus a constant of 254 mm.3. Refer to SAE J1100. For short-coupled seating. two distinct methods are employed for installing the HPM.1 A vehicle is said to be either short.1. e. Calculate L48.OVERVIEW OF SHORT-COUPLE CONDITION METHOD ‘A’ Uncontrolled copy when printed . the rearmost point of the heels should be on the lateral line determined in step ‘c’. Slide shoe forward until it makes contact with the lower seat structure. Use one of the lower leg-shoe assemblies of the H-point machine and initially place the sole on the floor covering with the heel as far rearward as possible. minimum knee clearance. Resume the general installation procedures except: 1. 2.7.SAE J826 Revised NOV2008 APPENDIX A . Method A (Shoe fits. f. When completing the rocking motion in 5.1 a. Measure L51. b. Other compartment metrics can be recorded with the H-point machine positioned as described. is best determined graphically on the drawing.3. h. L51. FIGURE A1 .Method A (HPM shoe fits into available floor space) A. Move the seat out of the way by using the available track travel. The shoes are repositioned with the rearmost point of the heels on the lateral line determined in step ‘c’. c.INSTALLATION PROCEDURE FOR SHORT. care should be used to prevent jack-knifing of the legs. the forward tilt or seatback adjustment. When positioning the shoes on the floor in 5. For installation of the HPM in a long-coupled vehicle. Knee does not fit) Position shoe on floor behind the front seat.5.AND LONG-COUPLED SEATING . or mathematically in CAD by transferring the physical HPM orientation to either environment. Short-Coupled Seating . d. and clam-shelling of the back and seat pans.15 - A.1. Method B (Inadequate floor space to fit the HPM shoe) .2. the shoes should be located as far rearward as possible. then: 1. When positioning the shoes on the floor in 5. by measuring the diagonal distance from the ankle point center to the H-point plus a constant of 254 mm less the movement of the preceding row’s seat recorded in A. Move seat forward along seat travel.1. Record the necessary seat travel used to fit the HPM shoe.2 J826 Revised NOV2008 Short-Coupled Seating .5.7. e.12.3. d. FIGURE A2 .SAE A. Place one or more registration marks on the side of the preceding row’s seat. or by physical means.3.3. minimum knee clearance. is best determined graphically on the drawing. or by mathematical methods in CAD. care should be used to prevent jack-knifing of the legs. 2. and clam-shelling of the back and seat pans. L48. and following the SAE J1100 procedure. Measure L51. determine the longitudinal (Delta X) displacement required to fit the shoe on the floor between the seating rows by graphical methods from the drawing. Follow the general installation procedure through 5. g. effective leg room. or mathematically in CAD by transferring the physical HPM orientation to either environment.3.16 - a. Other compartment metrics can be recorded with the H-point machine positioned as described.OVERVIEW OF SHORT-COUPLE CONDITION METHOD ‘B’ Uncontrolled copy when printed . or if no seat travel. Method B (Shoe does not fit): Position shoe in rearmost location to minimize interference with the seat (see Shoe Detail). b.1. If the preceding row’s seat has fore-aft adjustment capability. The shoes are repositioned as far rearward as possible. Resume the general installation procedures except: 1.d. 2. the forward tilt or seatback adjustment. h. Determine L51. If the preceding row’s seat does not adjust. Move the preceding row’s seat out of the way by using the remaining track travel. c. with the heel as far rearward as possible. Calculate L48 (see Knee Detail). Move this seat forward along the seat track travel path until the HPM shoe can be fitted. i. When completing the rocking motion in 5. translate horizontally until shoe will be clear of interference. Refer to SAE J1100. f. 3.SAE A. Determine L51: 1.3. 3. The ankle angle should not exceed 130 degrees.1. e. 2. If a foot support is not provided.2 DECISION TREE FOR SHORT. and following the SAE J1100 procedure.1.OVERVIEW OF LONG-COUPLE CONDITION A. Detach one of the lower leg-shoe assemblies of the H-point machine and place the sole on the floor.17 - a.f.3 Long-Coupled Seating J826 Revised NOV2008 .1.2) to the either environment. It can be approximated by measuring the diagonal distance between the ankle pivot center and the H-point (from A.b). Detach shoe and slide forward until it makes contact.6. Record the longitudinal distance ( X) between the heel location marked in step ‘c’ and the current heel location.3. Mark a lateral line at the rear of the heel location. Uncontrolled copy when printed . extend the H-point machine legs to the full limit of the seat deflection with both shoes flat on the floor.3. plus a constant of 254 mm and the additional heel point movement ( X). or mathematically in CAD by transferring the physical HPM orientation (from A. L51. is best determined graphically on the drawing.7.AND LONG-COUPLE CAD PROCEDURES Figure A4 provides a decision tree for selecting the appropriate CAD method to use for positioning the H-point template and measuring L48 and L51. Follow the general installation procedure through 5. d. effective leg room. When positioning the shoes on the floor in 5. place the shoe soles on the foot support with the heel located as indicated on the drawing. c. as the distance from the knee joint less 51 mm. minimum knee clearance.3. Slide the lower leg and shoe forward on the floor until it is obstructed by the seat cushion or support structure and mark a second line at the rear of the heel.1. f. FIGURE A3 . Refer to SAE J1100. b. Determine L48. Measure L48. Method: Move leg forward until restriction of ankle angle (130°). 4. Other compartment metrics can be recorded with the H-point machine positioned as described.b) and the most forward shoe position (from A.3. along the design H-point travel line until the shoe interference is cleared. No Does preceding row have seat travel? Yes Does the knee or lower leg interfere? Yes Translate preceding seat horizontally forward until the shoe interference is cleared. Measure Leg Room L51-x. Measure L48-x Short Couple Method Requires leg room penalty Move a copy of the shoe forward until it or the ankle circumference contacts the preceding rows’ seat. Indicate shoe location on drawing.18 - Collect Data Seating Reference Point Torso Angle Depressed Floor Covering Preceding Seat at SgRP and design torso angle Position the CAD Manikin 2-D Template at the Seating Reference Point and design torso angle No Position heel on the rearmost point of the floor with legs attached Is the floor covering continuous and large enough to accommodate the manikin shoe? Yes Position heel on the floor close to the SgRP X-value with legs attached Move the shoe forward along the depressed floor covering No No Does the shoe or ankle circumference contact the preceding seat? Yes Does the shoe or ankle circumference contact the preceding seat? No Is the ankle angle 130º? Yes Yes Long Couple Method Shoe is at FRP Indicate manikin position on drawing.DECISION TREE FOR COUPLE METHODS .2-D TEMPLATE PLACEMENT FOR 2ND TO NTH ROW Uncontrolled copy when printed . Move preceding seat forward.SAE J826 Revised NOV2008 . No Standard Method Short Couple Method No leg room penalty Shoe is at FRP Measure L48-x and L51-x from this position Shoe is at FRP Measure L48-x (negative) and L51-x from this position Shoe is at FRP Subtract preceding seat movement from L51-x Measure L48-x with no penalty (large negative) FIGURE A4 . 2.19 - B. Place the cushion and back assembly with legs removed on the selected seat.2.2.4 B.1 BACKGROUND AND DEFINITION OF CUSHION ANGLE See Section 7 and SAE J1100. alternately. four additional torso weights next to the H-point pivot.2 through 5.1 through 5.3.6 B.7. (All weights are placed on or in the cushion pan.2.4. B.4.DETERMINATION OF CUSHION ANGLE .2. rotate the head room probe to vertical using the torso angle level and lock it in position.3. See Figure B1 for proper distribution of weights. (Cushion Angle. the remaining two torso weights at the front of the cushion pan. Apply a 16 kg (35 lb) load to the push spring on the machine cushion pan. Set the torso angle quadrant to zero.Hip Angle scale reading) B. The weights will each lay propped outwardly in the forward corner of the cushion pan against the thigh weights.3.SAE J826 Revised NOV2008 APPENDIX B .5 B.8 Uncontrolled copy when printed .2.2.1 B.7.7 B.4 but with both lower legs removed.) Add.3 B.3.3. Other seated positions are specified in 5. alternately.2 Follow the same installation procedures as described in 5. Alternately install the two buttock weights on the H-point pivot on the cushion pan. A27) = (90 Degrees .2.2 MEASUREMENT PROCEDURE Cushion Angle is measured using the H-point machine with torso weights redistributed and lower legs removed to eliminate any confounding effect of packaging geometry on thigh attitude. Alternately place two torso weights next to the buttock weights. Lateral location for the driver is specified in 5. B. Add. Install the two thigh weights on the cushion pan and level the machine. The machine is now prepared for Cushion Angle readout using the hip angle quadrant to measure the Thigh Centerline angle (Hip angle relative to a vertical Torso angle). 20 - FIGURE B1 .DISTRIBUTION OF WEIGHTS FOR CUSHION ANGLE MEASUREMENT Uncontrolled copy when printed .SAE J826 Revised NOV2008 . SAE J826 H-POINT MACHINE CALIBRATION INSPECTION .SAE J826 Revised NOV2008 APPENDIX C .4 back pan shims of thickness 0.21 - C.0.CMM equipment for taking measurements . thickness range 0. positive z is upward and positive y is to the right of the H-point (viewing the HPM from rear).025 to 0. Actual calibration of the HPM shall be performed by an SAE sanctioned agency.Two ¾ inch open end wrenches .One 25 mm diameter rod at least 200 mm long . .Torque wrench (accurate in 20 to 40 in-lb range) with ¾ inch socket . 130 mm high.One 90-degree angle block at least 500 mm wide and 500 mm high .3 GRID SYSTEM The xyz axis orientations used to record CMM data and establish the tolerance measurements are as follows (Figure C1): .2 BASIC EQUIPMENT The following equipment is used for checking HPM calibration: .The x and y axes are parallel to the flat level surface. 1. 1 C-clamp with 20 mm throat .Flat.g. Uncontrolled copy when printed . . but they are useful during HPM setup) ..Metric scales: 100 mm and 1000 mm (neither scale is required. C. the x axis is normal to the vertical surface of the angle block and the y axis is parallel to the angle block.1 APPLICATION This inspection procedure can be used to check calibration of the SAE J826 H-Point Machine.Electronic Inclinometer .Set of shim gauges at least 125 mm long. C. height 130 mm.The z-axis is normal to the flat level surface. Angular measurements should be taken with either the CMM or the inclinometer. level surface (or surface plate) approximately 750 mm wide and 1000 mm long . Starrett #667) . at least 400 mm wide . 2 and 4 mm.Weight scale (accurate to +1 lb) Points used to determine distance measurements shown in Table C1 should be taken with a CMM.75 mm (e.5. .0) is at the H-point. and width 400 mm .The origin (0.1 cushion pan shim 4 mm thick.2 small C-clamps with 75 mm throats.Positive x is rearward. The upper and lower leg links are pinned at the 95% settings. The flat level surface and 90-degree angle block are used to position the HPM back and cushion pan.H1L and H1R divots are the crosshairs on the H-point buttons on each side of the cushion pan. .The thigh angle land is the top surface of the T-bar housing on the cushion pan. This angle convention is consistent with positive thigh angle and torso angle definitions.MEASUREMENT COORDINATE SYSTEM FOR HPM PANS This convention should be used for both linear and angular measurements.The ankle pivot center is the center of the bolt head or nut attaching the leg to the shoe. This land parallels the torso line of the HPM (Figure C1).22 - FIGURE C1 . Prior to calibrating the HPM the inclinometer shall be placed on the flat level surface parallel to the x and y axis and set to zero.The knee pivot center for the leg is the intersection of a longitudinal centerline (parallel to the y-axis) of the square T-bar and the centerline of the T-bar insert hole (x-axis).4 H-POINT MACHINE MEASUREMENT LOCATIONS Most measurements specified in the checking procedures are taken from available points and surfaces on the H-point machine. Uncontrolled copy when printed .SAE J826 Revised NOV2008 . . . C. A positive angle in side view is clockwise as viewed from the left side of the pans. Prior to 2008 these surfaces were not calibrated in HPM build or during HPM calibrations. . . . NOTE: The thigh angle land and torso angle land shown in Figure C1 are calibrated surfaces in HPM builds since 2008.The head room probe tip is at the top center of the head room probe. The inclinometer should be zeroed prior to each measurement taken. if the HPM is certified for HRMD assessments. .The torso angle land is the front surface of the head room probe scale on the back pan with the probe seated against the adjustment screw. The front face of the left yoke of the torso weight bar will also a calibrated surface for measuring torso angle. SAE C. C. Remove the H-point weight hanger bushing to gain access to the locking nut.5. .1 J826 Revised NOV2008 . Hold the nut on the other side and torque the locking nut. C. Note that the methods described below can be enhanced by constructing a special fixturing device containing adjustable surfaces that could reduce or eliminate the need for using shims.5 C. .and Z-planes defined by the flat level surface and the vertical angle block (Figure C3). Once the torque is set.23 - CUSHION AND BACK PAN: MEASUREMENT COORDINATE SYSTEM AND PRELIMINARY ADJUSTMENTS Set H-point Joint Torque Torque the nuts on the pivot of the H-point shaft assembly to 30 in-lb (Figure C2).Support the front of the cushion pan using the 25 mm rod such that the thigh angle land (top of the T-bar housing) is level as checked with the inclinometer. set the torso angle to 0 (vertical) with the back pan resting against the vertical block. Record values for 6a and 6b in Table C1. Adjust the left and right H-point divots by rotating the HPM until 2a=2b. See Figure C3.Align the HPM x-axis.2. If the back pan contacts the vertical block before the cushion pan. perpendicular to the vertical angle block.5. FIGURE C2 . Special fixtures could also be constructed to aid in aligning the HPM axes to the reference planes established by the flat level surface and 90 degree angle block.1 Cushion Pan (x and y axes) Use CMM equipment to align the HPM to the Y. Record these dimensions. . Record the torque setting in Table C1. .HPM TORQUE ADJUSTMENT. hand-tighten the H-point weight hanger bushing. SOME HPMS MAY DIFFER FROM THIS ILLUSTRATION. holding the back pan approximately vertical. Uncontrolled copy when printed .5. which is a line from the front center of the T-bar. and parallel to the flat level surface.2 Establish Measurement Coordinate System for HPM Body Pans Coordinate origin is the H-point. through the HPM H-point.Place the HPM cushion and back pan assembly on the flat level surface.Slide the cushion pan and back pan assembly against the vertical angle block. shim the cushion pan until 3a=3b using the appropriate shim gauge from the set of shim gauges.2. check the offset between the back of the back pan and the back of the cushion pan..3 and 5.5. The back pan may be up to 4 mm forward. The HPM y-axis should now be parallel to the angle block and to the flat level surface plate. but not rearward of the cushion pan when the torso angle is 0 degrees (vertical). Record these values in Table C1. Design intent is 0 offset. C. and that the knee pivot is aligned with the H-point. Uncontrolled copy when printed .4 before adjusting the bubble level.HPM CUSHION AND BACK PAN SETUP C.3 Check x-axis Inclination Take measurements 4a-4d and calculate 4i-4m in Table C1. measure the offset of mid-back surface between the top.5.Level HPM y-axis. complete steps 5.24 - . Shim the back pan until contact is made with the flat vertical area of the back pan between the attaching bolts.2 Check Cushion Pan Bubble Level Verify that the bubble level on the cushion pan reads level (Figure C1). These measurements verify that the thigh line (x-axis in inspection procedure) is horizontal.5. Also check that the mid-back flat surface is vertical. middle and bottom back pan bolts. since accessing the underside of the cushion pan will undo the measurement setup. If necessary. Using shim gages. FIGURE C3 . rotate the back pan until the flat area is tangent to the shim (visual inspection). measurements 3a and 3b are not equal). which is a line through the left and right H-point divots. Measure and record the heights of the left and right H-point buttons above the flat level surface (3a and 3b in Table C1 and shown as #3 in Figure C3). The difference between the top and bottom attachment bolts on the back (5b) is used to verify verticality of the flat portion of the back pan. Offset (5a) is measured between the mid-rear of the cushion pan and the back pan surface at the middle attachment bolt.4 Check Back Pan Verticality and Offset to Cushion Pan Prior to recording measurements.2. If the left and right H-point buttons are not equidistant above the flat level surface (i.e.SAE J826 Revised NOV2008 .2. These checks are made as follows. If not. C.2.2. 6. Cushion and back pan measures are illustrated in Figure C4.SAE J826 Revised NOV2008 . Place inclinometer on the torso angle land of the head room probe (the front surface of the head room scale). adjust the head room probe alignment set screw to attain a vertical condition.1 MEASUREMENTS AND ACCEPTABLE TOLERANCES Back Pan and Cushion Pan Recheck the alignments in 5.2.5 Back Pan (HPM z-axis) Set the headroom probe against its vertical stop.5.25 - If either the offset or the flat part of the HPM back pan is not within spec. mid-back) should be firmly against and tangent to the vertical angle block or a shim(s).HPM CUSHION AND BACK PAN MEASUREMENTS Uncontrolled copy when printed .2. remove the six attaching bolts and add washers between the metal and inside of the fiberglass shell to reposition the back pan to specification.2 to ensure that the HPM is still properly set up before continuing with measurements. FIGURE C4 . If not.2. C. C.1-5. The flat part of the back pan (the surface between the attaching bolts in the lower.6 C. It should read 90 degrees. Table C1 lists the measurements to be taken and the acceptable tolerances. After adjusting the back pan surface or the cushion pan bubble level to specification.3. The final offset of the back pan to cushion pan is the difference between the shim thicknesses for the cushion and back pans. repeat step 5. This establishes the HPM z-axis. 26 - The hip angle scale (7d) should read within +1.4 Check Torso Weight Bar Measurements 8a-8d from H-point to torso weight bar are not critical for measuring H-point.6. C. With the lower leg held vertically and the thigh bar horizontal. hip angle should be determined from inclinometer readings of torso and thigh angle lands.SAE C. Set the back of the leg to 90 degrees and the T-bar to horizontal.6. On some HPMs this scale is not adjustable. Record any scale reading error. c.1. They are important for measurements taken with the head restraint measuring device (HRMD) because the HRMD attaches to the torso weight bar (see Appendix D). and the other length measurements listed in Table C1 (left leg: 13a.6. Prior to 1989 the maximum width of both pans was slightly greater.1. C.1 set the head room probe to read 39 inches.0 degree of 0 when the torso angle bubble level indicates level.0 degree of 90 degrees. Prior to 2008 these dimensions were not controlled in HPM build. These two specifications apply to HPM builds since 1989 that have a serial number Txxx (or pan replacements on older HPMs). Check for excessive rotational effort about the ankle joint as follows (Figure C6). These dimensions will be controlled in future HPM builds if the HPM is intended for use with the HRMD. with the lower leg and thigh bar held horizontally. Record the knee and ankle angle scale readings (left leg codes: 12a and 12b) for both the inboard and outboard scales on each leg.6. Future readings of torso angle should be made using the inclinometer and calibrated land.1. Record and mark the scale reading error. The foot should rotate freely under its own weight without excessive lateral play. Neither the scale markings nor the bubble level are adjustable. the thigh bar should rotate under its own weight when released. Uncontrolled copy when printed . Also. Remove the thigh bar from the manikin and insert it into the knee pivot as far as possible.1 Check Hip Angle Scale J826 Revised NOV2008 . Check for excessive rotational effort about the knee joint as follows (Figure C6).2 Check Torso Angle Bubble Level Verify that the torso angle scale (7e. The maximum width of the cushion pan was 385 mm excluding the H-point buttons.2 Head Room Probe Using the set-up in 6.3 Leg and Shoe Assembly Remove the T-bar from the cushion pan and insert each leg on the T-bar. Support the leg and T-bar for measurement as shown in Figure C5.6. If the scale cannot be adjusted to meet specification. C. use a circle method with CMM to locate the center of the bar. Determine the measurements as described in Table C1 (11a through 11c).1. If not. The scale markings may be removed at the user’s discretion. the hip angle scale should be re-positioned to read 90 degrees.5 Check Pan Widths The maximum cushion and back pan widths. C.6. the thigh bar should rotate under its own weight when released. C. d).1. 7f) reads within +1. Both the cushion pan bubble level and the bubble level inclinometer are now aligned to the HPM y-axis. C. The maximum width of the back pan was 395 mm. b. measurements 10a and 10b in Table C1.3 Adjust Bubble Level Inclinometer Install the lateral bubble level inclinometer that’s used when rocking the HPM side-to-side.6. which approximates the mounting area of the HRMD. are shown in Figure C6.1. The tolerances for 8a-8d given in Table C1 are temporary placeholders until more and better data are available. Adjust so it reads 0 degrees. Suspend the lower leg assembly vertically above the floor. These measurements should be taken at 25mm from the inboard end of each torso weight bar. ANKLE AND KNEE JOINT EFFORT CHECK Uncontrolled copy when printed .27 - FIGURE C5 .SAE J826 Revised NOV2008 .LEG AND SHOE SETUP FIGURE C6 . HPM WEIGHTS Uncontrolled copy when printed .28 - Determine the weights of the components shown in Figure C7 and described in Table C1 (15a through 15d).4 Weights J826 Revised NOV2008 .SAE C.6. FIGURE C7 . 7 +/-2 mm 97.6 +/-2 mm bubble reads level Left 455. z – 95% leg Left (Right) knee pivot to H1L (H1R).5 +/-2 mm 407. x .C4) 1 2a 2b 2c 3a 3b Measurement .HPM DIMENSIONS AND TOLERANCES (ITEM NUMBERS IDENTIFY A MEASUREMENT SHOWN IN FIGURES C1-C7) H-Point Machine ____________________________________________ Item Description Date_______________________ Specification Back Pan and Cushion Pan (Figures C1 . 6a 6b 7a 7b 7c Thigh angle land (inclinometer on T-bar housing) Thigh angle (from CMM points on land) Torso angle land (inclinometer on head room probe scale) Torso angle (from CMM points on land) Hip angle (from CMM points on torso and thigh angle lands) Hip angle = torso angle – thigh angle 7d 7e 7f Hip angle scale reading Torso angle bubble level on hip quadrant Torso (back) angle scale reading (forward is a negative angle) 90 +/-1° bubble reads level 0 +/-1° 0 +/-0.1° 0 +/-0.7 +/-2 mm 97.9 +/-2 mm 134. Retake measurements 2-5.6 +/-2 mm 3c 3d 4a (b) H1 divot height from level surface (mean of 3a and 3b) Cushion pan bubble level Left (Right) knee pivot to H1L (H1R). measure to middle bolts of lower back at C/L Flat surface on lower mid-back. re-establish the measurement coordinate system.6 +/-2 mm 431.6 +/-2 mm 97.29 - H-point joint torque H1L divot rearward to vertical angle block surface H1R divot rearward to vertical angle block surface Mean H-point (center) rearward to vertical angle block surface H1L divot height from level surface H1R divot height from level surface Shim under cushion pan until 3a=3b 30 +/-4 in-lb 134. measure offset difference between upper and lower bolts at lower back C/L 97.2° 90 +/-0.5°) Final Right 4c (d) 4e (f) 4g (h) 4i 4j 4k 4m 5a 5b Note: After adjusting cushion pan bubble level or back pan offset/verticality.1 mm (90 +/-0.9 +/-2 mm 134. x .1 mm 0 +/-0.50% leg Left (Right) knee pivot to H1L (H1R).9 +/-2 mm 97.1° 90 +/-0.2° 90 +/-0.6 +/-2 mm 0 +/.25° Uncontrolled copy when printed .2° Initial 0 +4/-0 mm < 1.SAE J826 Revised NOV2008 TABLE C1 .10% leg Knee pivot x-distance from H-point (mean of 4a and 4b) Knee pivot height from level surface (mean of 4c and 4d) Difference in height between mean H1 and knee pivot (4j-3c) x-axis side view angle [arctan(4k/4i)] Back pan to cushion pan offset (value is positive if back pan is forward of cushion pan). x – horizontal distance for 95% leg length Left (Right) knee pivot height from level surface.7 +/-2 mm 455. 4 lb 1 Not a controlled dimension in HPM builds unless the HPM is intended for use with an HRMD. repair.4 +/-1 mm Mean H-pt to left inboard center of torso weight bar.6 if measured from H-point) Tip of head room probe fore aft of H-point Tip of head room probe each side of H-point Lower Legs (Figures C5. 8b 8c 1 .SAE 7g 7h 8a 1 J826 Revised NOV2008 Torso angle (inclinometer on land--left side torso weight yoke) Torso angle (from CMM points on land--left torso weight yoke) Mean H-pt to left inboard center of torso weight bar.2 +/-2 mm (888. Leg weight X 2 Total weight 43. C6) 986.5 +/-1° 107.4 +/-2. the nominal maximum cushion pan width is 385 mm.4 +/-0.8 +/-0. I O Right 12a (c) Left (Right) knee angle scale – inboard (I) and outboard sides (back of leg set at 90 degrees and T-bar horizontal) 12b (d) 13a (e) 13b (f) 13c (g) 13d (h) 14a 14b Ankle (foot) angle scale Left (Right) ankle pivot to level surface Left (Right) knee pivot to ankle pivot (95%) Left (Right) knee pivot to ankle pivot (50%) Left (Right) knee pivot to ankle pivot (10%) Left (Right) ankle pivot rotates freely Left (Right) knee pivot rotates freely Machine Weights (Figure C7) 15a 15b 15c 15d Cushion and Back Pans (includes inclinometer but no weights) Lower leg and shoe X 2 Torso and buttock weight X 10.2 +/-2 mm 458.5 lb 106. Z Note: Measurements 8a-d are made at 25 mm from inboard end of torso weight bar. Thigh weight X 2. Yes -.30 90 +/-0.7 lb 19. HPMs built prior to 1989 have slightly wider cushion and back pans and do not meet this tolerance specification. This is a key dimension for the HRMD. Z Mean H-pt to right inboard center of torso weight bar. maximum (Figure C6) Head Room (Figure C4) 11a Head room probe height at 39 inch setting above surface plate at H-point (subtract 97.7 +/-2 mm 417. X Mean H-pt to right inboard center of torso weight bar. Use CMM circle method to find center.If No. For the back pan the nominal width is 395 mm.7 lb 169.6 +/-3.1 +/-2 mm 392.5° 90 +/-0.If No. For these HPMs.8 mm button depth not included) Back pan width.4 +/-1 mm 0 +/-1 mm 0 +/-1° 379 +/-2 mm 388 +/-2 mm 1 1 8d 9 Lateral bubble level inclinometer reading 2 2 10a 10b Cushion pan width at H-point (3. 2 Uncontrolled copy when printed .7 +/-2 mm Yes -.6 from H-pt) 11b 11c +/-5 mm +/-5 mm Left 90 +/-1° I O 96. X 0 +/-1 mm 356. repair.5° 356. Z Note: Measurements 8a-d are made at 25 mm from inboard end of torso weight bar. Use CMM circle method to find center. 8b 8c 8d Mean H-pt to left inboard center of torso weight bar.31 - 7g 7h 8a 90 +/-0.1° 356.1° 90 +/-0. measure to middle bolts of lower back at C/L Torso angle (inclinometer on land--left side torso weight yoke) Torso angle (from CMM points on land--left torso weight yoke) Mean H-pt to left inboard center of torso weight bar.SAE J826 Revised NOV2008 HPM calibrated for use with HRMD (Figures C1 and C4) 5a Back pan to cushion pan offset (value is positive if back pan is forward of cushion pan). Z Mean H-pt to right inboard center of torso weight bar. X Mean H-pt to right inboard center of torso weight bar.4 +/-1 mm 0 +/-1 mm 0 +1/-0 mm . X 0 +/-1 mm 356.4 +/-1 mm Uncontrolled copy when printed . calibration of the HPM/HRMD system should again be verified. the user should confirm that the HPM still meets the calibration specifications of Appendix C.gov/staticfiles/DOT/NHTSA/Vehicle%20Safety/Test%20Procedures/Associated%20Files/TP-202aS-00. These measurements are cited in a federal regulation on head restraints (FMVSS 202a).3 CALIBRATION PROCEDURE At the time of publication there was no SAE sanctioned procedure to calibrate the HRMD together with the SAE J826 H-Point Machine.pdf The HRMD installation procedure used by NHTSA is available at www. If the HPM is subsequently used with the HRMD. The HPM and HRMD should be calibrated as a system.nhtsa. D. If an HPM is used for taking HRMD measurements.HEAD RESTRAINT MEASURING DEVICE (HRMD) .dot. and then disassembled and reassembled for performing conventional H-point installations. Disassembling and reassembling a calibrated HPM or HPM/HRMD system can affect its calibration.SAE J826 Revised NOV2008 APPENDIX D .org/ratings/protocols/pdf/head_restraint_procedure.pdf The two procedures are similar but not identical. An HPM calibrated for use with a given HRMD will likely have a unique certification marking.2 INSTALLATION PROCEDURE The HRMD installation procedure used by IIHS is available at http://www.iihs. In order to keep measurement variability as low as practicable.1 BACKGROUND The HRMD attaches to the torso weight bar of the HPM and is used to assess head restraint backset and height. the SAE HADD Committee strongly recommends that each measurement facility dedicate a single HPM and a single HRMD (acting as a test pair) when making head restraint assessments with the HRMD. Uncontrolled copy when printed .32 - D. A calibration procedure is under development and may be included in a future SAE standard. D.