Self-equalizing linkage for well derricks

Details Self-equalizing linkage for well derricks Self-equalizing linkage for well derricks

1975-10-15

1977-06-07

Smith, Al Lawrence

Implements or apparatus for applying pushing or pulling force

Pipe or rod jack

Tie rod tensioner

254 93R, B66F 324

Patent

active

040278549

ABSTRACT:
A self-equilizing mechanical leverage system for well-drilling derricks is provided for coupling pairs of hydraulic rams in side-by-side arrangement to a common load, in a manner to overcome the tendency of one ram of a pair to advance more rapidly than the other. The system is especially adapted for use with well-drilling derrick systems, for raising and lowering the drilling head and pipe string using elongated hydraulic cylinders and rams as the lifting means.

REFERENCES:
patent: 2090854 (1937-08-01), Timbs
patent: 2126933 (1938-08-01), Stone
patent: 2240794 (1941-06-01), Mason
patent: 2683019 (1954-07-01), Saunders et al.
patent: 3096075 (1963-07-01), Brown
patent: 3282357 (1966-11-01), Bunn
patent: 3413766 (1968-12-01), Wilson
patent: 3871617 (1975-03-01), Majima
patent: 3877680 (1975-04-01), Childs et al.

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