Double cylinder system

Details Double cylinder system Double cylinder system

1978-06-06

1981-02-10

Novosad, Stephen J.

Wells

Above ground apparatus

Moving tubing or cable into an existing well

173 28, 254 29R, 52 69, 52117, E21B 1922

Patent

active

042496004

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: 3313359 (1967-04-01), Ross et al.
patent: 3527309 (1970-09-01), Rassieur
patent: 3658270 (1972-04-01), Slator et al.
patent: 3752229 (1973-08-01), Pridy
patent: 3841407 (1974-10-01), Bozeman
patent: 3960360 (1976-06-01), Elliston
patent: 3999610 (1976-12-01), Sage et al.

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