The design of trolley bumpers for electric overhead traveling cranes.

This is an OSHA interpretation letter responding to a request about trolley bumper design for electric overhead traveling cranes. It states that a combination bumper and final stop on all four bridge corners for old cranes with cast iron trolley frames complies with the Overload Gantry Crane Standards if the bumpers can stop the trolley at an average deceleration not exceeding 4.7 feet/s/s in…