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(a) At the limits of travel of the bridges or gantry structures, bumpers or other positive travel limiting device shall be provided which will prevent bridge or gantry structures from leaving the ends of the rails. If bumpers are provided and they engage the tread of the wheel, they shall be of a height not less than the radius of the wheel.
(b) Bumpers, if used, shall have energy absorbing capacity to stop the crane when traveling at a speed of at least 40 percent of rated load speed, but the average deceleration rate shall not exceed 3 feet per second per second when traveling in either direction at 20 percent of the rated load speed and shall be so mounted that there is no direct shear on bolts.
NOTE: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.
1. Amendment of subsection (b) filed 2-13-75; effective thirtieth day thereafter (Register 75, No. 7).
2. Amendment of subsection (b) filed 8-29-86; effective thirtieth day thereafter (Register 86, No. 39).