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Subchapter 7. General Industry Safety Orders
Group 13. Cranes and Other Hoisting Equipment
Article 92. Cranes (Except Boom-Type Mobile Cranes)

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§4904. Trolley Bumpers.

(a) Bumpers shall be provided at each end of the trolley travel to prevent trolleys leaving the rails. If the bumpers engage the tread of the wheels, they shall be of a height at least equal to the radius of the wheel. Trolley bumpers shall be capable of stopping the trolley at an average rate of deceleration not exceeding 4.7 feet per second per second when traveling in either direction at 1/3 of the rated load speed. Bumpers shall be designed and installed to minimize parts falling from the trolley in case of breakage.

(b) If there is more than one trolley on the same bridge girder, buffers or other cushioning devices shall be placed between the trolleys. Buffers shall be designed and installed to minimize parts falling from the trolley in case of breakage.

NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code

HISTORY

1. Amendment filed 2-13-75; effective thirtieth day thereafter (Register 75, No. 7).

2. New NOTE filed 8-29-86; effective thirtieth day thereafter (Register 86, No. 39).

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