HOIST LIMITING SYSTEMS AND METHODS

摘要

A hoist rotation limiting system for a hoist. A hoist drum has a grooved exterior surface configured to position a cable in a predetermined position relative to the ends and longitudinal axis of the hoist drum as the cable is wound onto or off of the hoist drum. Upon the cable being positioned in the predetermined position, the cable urges portions of a carrier weldment to contact a switch, thereby sending an electrical signal to stop rotation of a hoist motor.

主权项

1. A hoist limiting system for a hoist having a hoist motor, the hoist limiting system comprising:
a hoist drum coupled to the hoist motor, wherein the hoist drum is configured for selective rotation about a rotation axis, wherein an exterior surface of the hoist drum defines a groove, and wherein the hoist drum has a first end and a second end; a cable configured to be positioned therein the, groove of the hoist drum, wherein the cable is at least partially wound around the hoist drum such that, upon rotation of the hoist drum about the rotation axis in a first direction, the cable is further wound around the hoist drum in a predetermined direction relative to the first and second ends of the hoist drum; a carrier weldment positioned adjacent the hoist drum and comprising:
a mounting plate slidably attached to the hoist,at least one trigger contacting member extending away from a first side of the mounting plate a predetermined distance; andat least one cable contacting finger attached to and extending away from a second, opposed side of the mounting plate;a mounting bracket fixed to a central portion of a frame of the hoist; and at least one switch positioned on a central portion of the mounting bracket between the hoist drum and the mounting plate, the at least one switch being electrically coupled to the hoist motor, wherein the at least one switch is located interior to the at least one trigger contacting member, and wherein after the cable is wound around the hoist drum a predetermined distance, a portion of the cable contacts the at least one cable contacting finger and urges the at least one cable contacting finger, the mounting pate, and the at least one trigger contacting member to slide towards an end of the hoist drum, wherein upon sliding a predetermined distance, the at least one trigger contacting member contacts and actuates the at least one switch, and wherein upon actuation, the at least one switch sends a signal to the hoist motor to alter rotation of the hoist motor arid hoist drum.