Interlock control system for a fluid-operated hoist

Details Interlock control system for a fluid-operated hoist Interlock control system for a fluid-operated hoist

1974-07-17

1976-01-20

Werner, Frank E.

Handling: hand and hoist-line implements

Utilizing fluid pressure

Venturi effect

254168, 214650SG, B66C 102

Patent

active

039333884

ABSTRACT:
Fluid-operated, load-handling apparatus is provided with an interlock control system. The fluid-operated apparatus specifically is a pneumatically-operated hoist having a two-handle operator control, one for raising a load and one for lowering the load. The interlock system enables normal operation of the hoist when a load is properly engaged by a load-engaging unit of the hoist and also when no load at all is present. However, the system prevents operation of the hoist if a load is present and not properly engaged. The interlock system includes a load-sensing device and a load-sensitive valve operated by the device, and further includes a pressure-sensitive valve. The hoist can be operated normally when neither valve is actuated or both are actuated, but not when one is actuated.

REFERENCES:
patent: 2942745 (1960-06-01), Horton
patent: 3187989 (1965-06-01), Barto
patent: 3253719 (1966-05-01), Povlacs et al.
patent: 3756563 (1973-09-01), Stone

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