A-A-50041D
prevent inadvertent opening of the gate during use. The gate and the locking nut shall operate easily without jamming in either the open or closed positions. The hinge pin attaching the gate to the body shall be tightly peened or pressed into the body of the snap link. The color of the snap link shall be that of natural zinc plated steel and its maximum weight shall be 224 grams (see figure I).
3.3 Type III snap link. The type III snap link shall be aluminum construction. The snap link shall be "D" shaped. The hinge pin attaching the gate to the body shall be tightly peened or pressed into the body of the snap link. The gate shall operate easily without jamming in either direction. The color of the snap link shall be that of natural aluminum, and its maximum weight shall be 98 grams (see figure I).
3.4 Proof loading.
3.4.1 Type I. The type I snap link shall be capable of withstanding a 910 kg proof test load in the longitudinal direction with the gate in the closed position and the locking nut in the open position without any deformation. The snap link shall also be capable of withstanding a 1460 kg proof test load in the longitudinal direction with the nut in the locked position without the snap link breaking or cracking.
3.4.1.1 Proof load test, Type I. Any desired operating speed may be used until a load of
590 kg is reached. After reaching that point the speed shall be maintained at not more than 4 inches per minute or less than 1 inch per minute until a load of 910 kg is reached. This load shall be maintained for not less than 10 nor more than 15 seconds. Any deformation of the snap link shall constitute failure of this test. Deformation shall be determined by operating the gate, if the gate functions properly there is no deformation of the snap link. Snap links with the gate closed and the locking nut in the closed position shall be tested in accordance with the same procedure except that the final load shall be
1460 kg. The snap links shall withstand the 1460 kg load without breaking of cracking. Snap links subjected to this test shall be discarded. Snap links shall be tested for operation of the locking nut and gate by screwing the nut from the open position to the locked position and then back to the open position. The gate shall then be moved from the closed position to the completely open position and then released. Any jamming of the nut or gate shall be considered a failure. Any test failure shall be cause for rejection of the lot.
3.4.2 Type II. The type II snap link shall be capable of withstanding a 2300 kg proof test load in the longitudinal direction with the gate in the closed position and the locking nut
in the open position without any deformation. The snap link shall also be capable of withstanding a 3600 kg proof test load in the longitudinal direction with the nut in the locked position without the snap link breaking or cracking.
3.4.2.1 Proof load test, Type II. Any desired operating speed may be used until a load of
1600 kg is reached. After reaching that point the speed shall be maintained at not more than 4 inches per minute or less than 1 inch per minute until a load of 2300 kg is reached. This load shall be maintained for not less than 10 nor more than 15 seconds. Any
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