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. The seat belt shall also be designed to secure the pelvis and remain in the pelvic area under operating, collision, or roll-over conditions.

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Rationale statement available. This standard, beyond ISO , includes testing of seat belt anchorage forces on industrial and agricultural machines and the testing of seat belt assemblies. L Scope — This SAE Standard provides performance and test requirements for operator restraint systems provided for off-road self-propelled work machines.

This force should be added to the 15 N test force described in 4. The latest issue of SAE publications shall apply. It includes buckles or other features, and may include the attachment hardware designed for installing the seat belt assembly to an anchorage. This could include the seat assembly, fixed seat support, or seat suspension flexible seat support. 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 3. In all operating positions, adjustment to a snug condition shall at least accommodate the 5th percentile United States female through the 95th percentile United States winter-clothed male, reference SAE J To meet the previous requirements, overall length of belt may vary depending upon anchorage locations. The creep shall not exceed 25 mm for each adjusting device in the assembly.

The sum of creep amounts for all adjusting devices in the belt assembly shall not exceed 40 mm. The test apparatus shall conform to that shown in Figure 2 for test 1 and test 2. Apply a 5 kg mass to the lower end of each belt assembly.

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. Guide the 5 kg mass vertically in a manner to prevent swaying of the mass and twisting of the belt during test. The attachment shall be fixed to tiie 5 kg mass as in the machine. Before start of test, complete 20 cycles of the reciprocating motion to remove initial slack.

Mark the force-bearing strap material at each adjuster in preparation for measuring creep. Complete cycles at a frequency of 0. Refer to Figure 2.

Measure the distance the strap material has moved at each adjusting device. The rollers shall be mounted on anti-friction bearings, and shall have sufficient capacity so that tiiere is no brinelling, bending, or other distortion of parts which may affect results. Proper installation, including the proper manner of threading the strap into the attachment hardware when threadable hardware is supplied, b.

Proper wearing of the installed assembly. Proper maintenance including cleaning procedures and periodic inspection for wear or damage. The stiffness shall be effective for the usable life of the strap. After conditioning, the new material shall have a tensile breaking strength of not less than 26 N. 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 tiie grips, the strap material shall be stretched continuously at a uniform rate to failure. Each failure force value shall be not less than the 26 N tensile breaking strength requirement. The strap material shall be mounted in apparatus shown schematically in Figure 4. 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 tho new abrading edges of the hexagon bar, C, and the other 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 abraded strap material shall be conditioned and tested for breaking strength as described in 3,2. After subjection to the force described in 3. The buckle release force shall be measured by applying a force on the buckle in a manner and dhection typical of that which would be employed by a seat belt user. The release force shall be applied on the centerline of the buckle lever or finger tab in a direction that produces maximum releasing effect.

This pad must cover the entire buckle area and is to be tiie full width of the strap. It must be permanentiy fastened to the asscmf! SIZE, 6. End Fittings Mounting Brackets — End fittings mounting brackets shall witiistand a loop force of 22 N when tested on equipment similar to that shown in Figure 3.

During tiie test, tiie attaching bolts shaU be parallel to or at an angle of 45 or 90 degrees to tiie strap material, whichever results in an angle nearest to 90 degrees between tiie strap material and tiie end fitting.

Exception: Eye bolts shall be mounted vertically. When a locking retractor is included in a seat belt assembly, it shall be locked at tiie start of tiie seat belt assembly strengtii test. A seat belt assembly utilizing a nonlocking retractor shall have tiie strap material fiilly extended from tiie retractor at the start of tiie seat belt assembly strength test. The extension belt length may be adjustable. Replace the seat belt assembly immediately if damage such as worn or damaged hardware, nicked or ftayed strap, buckle or retractor malfunction, or loose stitching is found.

L3 After the force is applied to the seat system, the force application device shall not be repositioned to compensate for any changes that may occur to the force application angle. If a retractor is included in the assembly, refer to3. The force shall be attained in not more than 30 s and naaintained for not less than 10 s.


SAE J386: Operator Restraint Systems for Off-Road Work Machines




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