Emergency pawl release system for winches

Details Emergency pawl release system for winches Emergency pawl release system for winches

1982-07-16

1984-12-04

Levy, Stuart S.

Implements or apparatus for applying pushing or pulling force

Apparatus for hauling or hoisting load, including driven...

Device includes rotatably driven, cable contacting drum

60636, 74577S, B66D 532, F16D 4112

Patent

active

044860072

ABSTRACT:
A hinged pawl and an emergency pawl release system for heavy duty winches such as those used to anchor semi-submersible drilling rigs. The pawl includes two sections hinged together at an overcenter knuckle joint and provided with flat bearing surfaces which hold the pawl in a rigid position engaged with a ratchet wheel on the winch drum. The pawl is normally engaged and released by a pneumatic cylinder. In an emergency situation involving a loss of electric power while the winch is heavily loaded, the pawl is collapsed about the knuckle joint by an air operated explosive actuator which applies an explosive release force to the pawl. The pneumatic control system for the explosive actuator releases both the clutch and the brake of the winch when the actuator is fired.

REFERENCES:
patent: 147817 (1874-02-01), Bryant
patent: 248883 (1881-11-01), Ralston
patent: 3058548 (1962-10-01), Stair
patent: 3240474 (1966-03-01), Garnier
patent: 3302931 (1967-02-01), Blackburn
patent: 3803942 (1974-04-01), Duggan
patent: 4230288 (1980-10-01), Fohl

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