Double cylinder system

Details Double cylinder system Double cylinder system

1980-12-08

1982-06-29

Novosad, Stephen J.

Wells

Above ground apparatus

Moving tubing or cable into an existing well

52 69, 52117, 91167R, 92117A, 173 28, 173152, 254 93VA, E21B 1500, E21B 1908, E21B 1922

Patent

active

043368409

ABSTRACT:
Disclosed is a system including two or more fluid pressure piston-and-cylinder assemblies. The cylinders are linked in pairs so that retraction of both piston rods reduces the length of the pair of assemblies to the length of a single assembly. Operation of both pistons in a pair provides an effective stroke twice the length of a single assembly stroke. In a particular embodiment, a double cylinder system is used as a pickup system for elevating equipment along a mast in a well workover rig.

REFERENCES:
patent: 2126933 (1938-08-01), Stone et al.
patent: 2502895 (1950-04-01), Shaffer
patent: 2595401 (1952-05-01), Moon
patent: 2821264 (1958-01-01), Ulinski
patent: 2930582 (1960-03-01), Foster
patent: 3003746 (1961-10-01), Gridley
patent: 3026950 (1962-03-01), Johnson
patent: 3250182 (1966-05-01), Nansel
patent: 3841407 (1974-10-01), Bozeman
patent: 3978768 (1976-09-01), Ringkamp

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