Safety elevator

Details Safety elevator Safety elevator

1992-09-04

1994-08-23

Cherry, Johnny D.

Handling: hand and hoist-line implements

Hook, hoistline, or grab type

Locking device

294 90, 2941022, 2941101, E21B 1906

Patent

active

053401824

ABSTRACT:
An elevator for supporting a string of pipe in a well rig is actuable between a closed condition for gripping of the pipe and an open condition, and includes a safety device for preventing opening of the elevator when a string of pipe is positioned in and supported by the elevator, to thus prevent accidental dropping of the string into a well. The elevator may be opened and closed by air pressure, with the safety device preferably including a sensing element positioned to respond to the presence of a well pipe in the elevator at a location to be supported thereby, and a valve actuable by the sensing element to control the delivery of pressure fluid to the elevator.

REFERENCES:
patent: 1599144 (1926-09-01), Paulsen
patent: 1814407 (1931-07-01), Peebles
patent: 2636769 (1953-04-01), Cobb
patent: 2684166 (1954-07-01), DeJarnett
patent: 2692059 (1954-10-01), Bolling
patent: 2695189 (1954-11-01), Chrisman et al.
patent: 2722450 (1955-11-01), Nelson
patent: 3363929 (1968-01-01), Nelson
patent: 4878705 (1989-11-01), Arnquist
Brochure of Varco International, Inc. entitled "Varco BJ Air Operated Elevators" showing several prior art air operated elevators, Jan. 1990.

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