Power hoist

Details Power hoist Power hoist

1977-02-22

1979-06-19

Smith, Jr., David

Electricity: motive power systems

Braking

Plural, diverse or diversely controlled braking means

192 2, 254186HC, H02P 310, H02P 314

Patent

active

041587979

ABSTRACT:
A power hoist is disclosed wherein a single operating lever is moved between haul, hold and lock positions. A load may be suspended when the hoist is in hold position by means of braking action which is primarily provided by closing a shunting switch across the leads of a DC motor whereby the motor functions as a brake, which holding action, when necessary, is supplemented by a positive mechanical locking device engageable with the gear train. The combination of electrical shunt holding means with mechanical locking means, both operated by the same lever member enables convenient and improved hoist action in which the load may be securely held in a suspended position without any creepage taking place, and without danger of damage to the mechanical locking system.

REFERENCES:
patent: 2549870 (1951-04-01), Wallace
patent: 2902635 (1959-09-01), Kuka
patent: 3708046 (1973-01-01), Brown
patent: 3773294 (1973-11-01), Alcott

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