Hydraulically operated mandrels

Details Hydraulically operated mandrels Hydraulically operated mandrels

1981-08-05

1984-02-07

Taylor, Dennis L.

Hydraulic and earth engineering

Foundation

Columnar structure

405247, 269 481, E02D 1100

Patent

active

044300247

ABSTRACT:
Expandable tubular mandrels have lengthwise sections the upper ends of which are joined by a head. Hydraulically operated piston-cylinder units within the mandrel are spaced apart lengthwise of the sections and connected to the mandrel in a manner such that the axis of each unit extends lengthwise of the mandrel and expanding and contracting forces are applied to the mandrel sections when the units are operated to vary their overall length, to effect mandrel expansion when their overall lengths are changed in one direction and mandrel retraction when changed in the opposite direction.

REFERENCES:
patent: 2881593 (1959-04-01), Cobi
patent: 3118284 (1964-01-01), Cobi
patent: 3131544 (1964-05-01), Thornley
patent: 3803854 (1974-04-01), Guild et al.
patent: 3984992 (1976-10-01), Merjan

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