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SAE J Scope This SAE Standard establishes the minimum performance requirements for pelvic restraint systems seat belts, anchorages, and the fastening elements of seat belts necessary to restrain an operator or rider within a roll-over protective structure ROPS in the event of a machine roll-over, as defined in ISO , or tip-over protection structure TOPS , in the event of a machine tip over as defined in ISO At the time of publication the editions indicated were valid.
All standards are subject to revision and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
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. 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.
SAE 2. I"" ,i',iUl kf? Further extraction of the strap is prevented without voluntary intervention by the wearer. Such a device has length adjusting components strap to the wearer and a locking mechanism actuated in an emergency the machine single sensitivity , a combination of machine deceleration, other locking means multiple sensitivity. H Le;, A". HlJWllll ",jNl i'T',m ;-;,.. If the seat does not swivel nor has a suspension system, the seat belt assembly may be anchored to the seat or to the machine at any point within the hatched zones shown in Figure 1.
Alternatively, the seat belt assembly shall be attached to anchorages on the seat near the corners of the seat cushion within the hatched zone shown in Figure 1, so that the loop size of the seat belt assembly does not change as the seat suspension oscillates.
Extension Tether Belts Belts, cables, or similar flexible devices may be used to transfer the seat belt assembly forces from the seat belt anchorages to the machine. The extension belt length may be adjustable. Extension belts must meet the seat belt assembly force requirements of 4. Where practical, the preferred angle through the SIP is toward the more vertical.
The seat belt assembly is intended to remain in the pelvic girdle area under operating, collision, and rollover conditions, thereby restraining the operator's hips and lower torso area to the seat assembly. Replace the seat belt assembly immediately if damage such as worn or damaged hardware, nicked or frayed strap, buckle or retractor malfunction, or loose stitching is found. Performance Requirements 4. The seat shall be adjusted to the operating position, which produces the most severe loading condition to the operator restraint system, prior to any subsequent structural deflection.
After the force is applied to the operator restraint system, the force application device shall not be repositioned to compensate for any changes that may occur to the force application angle. The seat belt assembly force shall be applied using a body block similar to that shown in Figure 2.
If a retractor is included in the assembly, refer to 5. With the test set-up free of slack, a force of 15 N plus 10 times 9. The force shall be attained in not more than 30 s and maintained for not less than lOs. Permanent deformation of any elements shall not constitute failure. It shall also be capable of being released with either hand, bare or mittened. The buckle shall be designed to minimize the possibility of accidental release due to operator movement, inertia, or external forces. The buckle shall meet all the requirements described in 5.
Any adjustment of the seat belt shall be capable of being made with mittened hands. The strap length shall be adjustable for the 5th percentile to the arctic clothed 95th percentile operator. See ISO The micro-slip shall not exceed 25 mm for each adjusting device in the assembly. The sum of micro-slip amounts for all adjusting devices in the belt assembly shall not exceed 40 mm. The test apparatus shall conform to that shown in Figure 4.
If there is a free end serving as reserve strap, it shall not be fastened or clipped to the section subjected to the 5 kg mass; d. Ensure that on the test bench, the strap in the slack position maintains contact with the full length of the body block; e. Guide the 5 kg mass vertically in a manner to prevent swaying of the mass and twisting of the belt during test; f.
The attachment shall be fixed to the 5 kg mass as in the machine; g. Before start of test, complete 20 cycles of the reciprocating motion to remove initial slack; h.
Mark the force-bearing strap material at each adjuster in preparation for measuring creep; i. Complete cycles at a frequency of 0. Refer to Figure 4. Measure the distance the strap material has moved at each adjusting device.
The complete seat belt assembly, including strapping, straps, buckles, adjustment and attachment hardware, and retractors, shall withstand a tensile force of not less than All components of three seat belt assemblies shall be tested as specified in 5.
The pelvic restraint between seat belt anchorages shall be adjusted to a length between mm and mm, or as near to this length as possible if the design of the pelvic restraint does not permit its adjustment to this length. An automatic locking or emergency locking retractor, when included in a seat belt assembly, shall be locked at the start of the test with a tension in the strapping slightly in excess of the retractile force in order to keep the retractor locked. The attachment hardware shall be oriented to the strapping as specified in 5.
A tensile force of The force shall be reduced and the buckle release force shall meet the requirements of 5. W :t;'-l. The attaching bolt, with the listed exceptions, shall be parallel, or at an angle of 45 degrees or 90 degrees to the strapping, whichever results in the greatest angle between strapping and attachment hardware.
Eye bolts shall be vertical, and attaching bolts of a seat belt assembly designed for use in specific models of machines shall be installed to produce the maximum angle in use indicated by the installation instructions.
Proper installation, including the proper manner of threading the strap into the attachment hardware when threadable hardware is supplied. Proper wearing olthe installed assembly. Proper maintenance including cleaning procedures and periodic inspection for wear or damage as described in 4.
The stiffness shall be effective for the usable life of the strap. The strap shall be flexible in the longitudinal direction to permit adjustment at 'C.
After conditioning three specimens, the new material shall have a tensile breaking strength of not less than The distance between centers of the grips of the machine at the start of the test shall be between and mm. After placing the specimen in the grips, the strap material shall be stretched continuously at a uniform rate to failure. Each failure force value shall not be less than CI Ji,lJ fj'f ,. The strap material shall be mounted in apparatus shown schematically in Figure 6.
One end of the strap material, A, shall be attached to a weight, B, which has a mass of 2. The strap material shall be passed over the new abrading edges of the hexagon bar, C, and the opposite end attached to an OSCillating drum, D, which has a stroke of mm.
Suitable guides shall be used to prevent movement of the strap material along the axis of the hexagonal bar, C. The median value for the breaking strength determined on three abraded specimens shall be not less than 20 kN tensile strength.
Upon removal of the compressive force, it shall be operable and meet the applicable requirements of 5. The force shall be applied through a cylindrical bar 19 mm in diameter, at least mm long, and curved to a radius of mm. The bar shall be placed with the longitudinal centerline of the bar directly above the lines through the longitudinal centerline of the buckle and at 60 degrees to it Figure 7. The latch plate shall be disengaged from the buckle and the compressive force applied to the buckle again.
The buckle-latch plate assembly shall be separable by a force of not more than 22 N when tested according to the procedure specified in 5. The buckles from three seat belt assemblies shall be fully latched with their latch plates and unlatched at least 10 times. Each buckle shall then, with the latch plate withdrawn from the buckle, be clamped or firmly held against a solid surface so as to permit normal movement of buckle parts without movement of the buckle assembly.
After completion of this portion of the test, the N force shall be reduced to a force of just sufficient magnitude to assure full travel to the stop for an additional cycles. The performance of each buckle shall then be evaluated with respect to 5. This force shall not exceed 50 N when measured by the procedure specified in 5.
Three buckles or other manual adjusting devices normally used to adjust the length of the assembly shall be tested. This test shall be conducted within 1 h after conditioning under laboratory ambient conditions. The strapping shall be precycled 10 times prior to measurement.
H zun, D! This test shall be conducted on buckles or other manual adjusting devices employing a tilt-lock feature to adjust the length of the assembly, using strapping intended for use in the adjusting device, Three buckles or devices shall be tested within 1 h after oonditioning the strapping for 4 h at laboratory ambient conditions, The base of the adjustment mechanism and the anchor end of the strapping shall be oriented in planes normal to one another with the strapping vertical as in Figure 8.
Three samples of a given buckle shall be tested. After SUbjection to the force described in 5. The buckle release force shall be measured by applying a force on the buckle in a manner and direction typical of that employed by a seat belt user.
A buckle designed for lift lever application of buckle release shall at least permit the insertion of a cylinder 10 mm in diameter and 38 mm in length to at least the midpoint of the cylinder along the lift lever's entire length in the actuating portion of the buckle release.
The release force shall be applied on the centerline of the buckle lever or finger tab in a direction that produces maximum releasing effect. Buckles having other designs for release shall have adequate access to actuate release with the mittened hand.
It shall be permanently fastened to the assembly in such a manner that it is not injurious or uncomfortable to the operator, does not hinder operation of any part of the seat belt, and does not expose any rough surfaces to the operator's clothing. COl'lHJ ,ifj I. I Z liN: When an automatic locking or emergency locking retractor is included in a seat belt assembly, it shall be locked at the start of the test with a tension in the strapping slightly in excess of the retractile force'in order to keep the retractor locked.
A seat belt assembly utilizing a non locking retractor shall have the strap material fully extended from the retractor at the start of the strength test. Begin the measurement with no strapping on the retractor and continue to monitor the retraction force until there is mm on the retractor.
Compute the average of the reading from 0 mm to mm.
SAE J386: Operator Restraint Systems for Off-Road Work Machines
This SAE Standard establishes the minimum performance requirements for pelvic restraint systems seat belts, anchorages, and the fastening elements of seat belts necessary to restrain an operator or rider within a roll-over protective structure ROPS in the event of a machine roll-over, as defined in ISO , or tip-over protection structure TOPS , in the event of a machine tip over as defined in ISO Your Alert Profile lists the documents that will be monitored. If the document is revised or amended, you will be notified by email. You may delete a document from your Alert Profile at any time. This standard is also available to be included in Standards Subscriptions. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Subscription pricing is determined by: the specific standard s or collections of standards, the number of locations accessing the standards, and the number of employees that need access.
BS EN ISO 6683:2005
This banner text can have markup. Search the history of over billion web pages on the Internet. Purpose— The purpose of this recommended practice is to estab- lish minimum requirements for a pelvic restraint belt suitable' for use primarily on track-type tractors, wheel tractor-scrapers, wheel loaders, motor graders, and similar types of construction equipment. Scope— This recommended practice covers the general require- ments for webbing, buckle hardware, adjustment hardware, and attach- ment hardware of the restraint system. It does not include the method or direction of attachment to the vehicle or seat assembly. Definitions 3. General Requirements 4.