The design of trolley bumpers for electric overhead traveling cranes.

Standard Number: 1910.179 

April 23, 1979

Mr. H. W. Beamer
Project Engineer
Pollock Research and Design,
Incorporated
P.O. Box 66
Canfield, Ohio 44406

Dear Mr. Beamer:

This is in response to your recent letter requesting an opinion on the design of trolley bumpers for electric overhead traveling cranes.

Your idea of a combination bumper and final stop to be mounted on all four corners of the bridge for old cranes that have cast iron trolley frames appears to comply with the intent of the Overload Gantry Crane Standards, provided that:

The bumpers shall be capable of stopping the trolley (not including the lifted load) at an average rate of deceleration not to exceed 4.7 feet/s/s when traveling in either direction at one third of the rated load speed, as required by 29 CFR 1910.179(e)(3)(i). 

If I may be of further assistance, please feel free to contact me.

Sincerely,

Grover C. Wrenn Director,
Federal Compliance and State Programs