Hydraulic tensioner

Details Hydraulic tensioner Hydraulic tensioner

1995-03-17

1998-02-03

Watson, Robert C.

Implements or apparatus for applying pushing or pulling force

Pipe or rod jack

Tie rod tensioner

E21B 1900

Patent

active

057135584

ABSTRACT:
A hydraulic tensioner for tensioning a threaded connector has a substantially tubular housing having an axis, one axial end to abut against an object, and another opposite axial end, a substantially tubular engaging element arranged radially inside the housing so as to form a space therebetween and provided with engaging means for engaging a threaded connector, a plurality of pistons arranged in the space and spaced axially from one another so as to form a plurality of chambers in the space, and passages for supplying a working liquid into the chambers so as to apply a force to the housing and to the engaging element whereby when the housing abuts against the object in one axial direction, the engaging element is displaced axially in an opposite direction and thereby axially pulls the threaded connector in an opposite axial direction. The radially outer dimension of the chambers reduces in a direction from the another axial end to the one axial end of the housing.

REFERENCES:
patent: 3008362 (1961-11-01), Tucker
patent: 3718205 (1973-02-01), Fair et al.
patent: 4074890 (1978-02-01), Boudet et al.
patent: 4314690 (1982-02-01), Mlynarik et al.
patent: 4949943 (1990-08-01), Bernstein
patent: 4973033 (1990-11-01), Sun

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