Mast safety restraint mechanism

摘要

Described herein is a safety restraint mechanism for a mast assembly. The safety restraint mechanism comprises a tension line attached to a lever and a winch mechanism such that operation of the winch mechanism translates a carriage assembly along the mast. A cam brake including an engagement profile at a first end thereon is pivotally attached to the lever at a second end. The cam brake is also pivotally attached to the carriage assembly such that the engagement profile pivots into a brake position or a free lift position relative to a tension force acting on the lever. The lever is pivotally attached to the second end and includes a kickstand. The engagement profile having a protruded portion to abut the tubes in a brake position and a relief portion to space the cam brake from the tubes in a free lift position.

主权项

1. A safety restraint mechanism for an associated mast assembly, the safety restraint mechanism comprising:
a carriage assembly adapted to support an associated payload and configured to move axially along the mast assembly; an elongated line attached to a lever at a first end and attached to an associated winch mechanism at a second end such that operation of the associated winch mechanism retracts or extends the elongated line; a cam brake having an engagement profile at a first end and pivotally attached to the lever at a second end, the cam brake being pivotally attached to the carriage assembly such that the engagement profile pivots to a brake position or a free position relative to a tension force acting on a tension line.