Hydraulically operated heavy lift system for vertically moving a

Details Hydraulically operated heavy lift system for vertically moving a Hydraulically operated heavy lift system for vertically moving a

1974-06-13

1976-04-13

Werner, Frank E.

Boring or penetrating the earth

Below-ground impact members

With releasable means to detachably retain telescoping...

214 25, 175 85, E21B 1900

Patent

active

039498832

ABSTRACT:
A system utilizing linear hydraulic cylinders for continuously raising or lowering a pipe string. Two sets of cylinders are spaced along the length of the pipe string. The cylinders are driven reciprocally with the cylinders in one set moving out of phase with the cylinders of the second set. Each set of cylinders includes means for releasably supporting the pipe string. The supporting means are operated out of phase so that one is released while the other is supporting the pipe. Control is such that the cylinder sets alternately raise or lower the pipe by incremental amounts, providing a continuous constant motion to the pipe string.

REFERENCES:
patent: 3145786 (1964-08-01), O'Neill et al.
patent: 3177944 (1965-04-01), Knights
patent: 3390654 (1968-07-01), Bromell et al.

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