Crane bumpers

Runway bumpers act similarly to their automobile counterparts:

• They absorb kinetic energy of the crane's impact.

Bridge bumpers should be designed to resist the force resulting from the crane hitting the stop at 40% of the rated speed.

For top-running bridge cranes, a heavy bracket bolted to the top of the runway girder is used as a stop. The bracket either:

• has an attached bumper, or
• is designed to come in contact with a bumper installed on the crane's end truck.

Eventually, the force on the stop is transferred to the building structure and bracing.