Importance

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Abstract

A hydraulic work support assembly includes a externally threaded housing and a sleeve pressed into the bore of the housing which in turn receives a cylindrical plunger. The plunger may be extended to any one of a number of positions and thereafter locked in place upon application of hydraulic pressure to an annular chamber between the sleeve and the housing which causes the sleeve to contract and grip the complimental plunger. The end of the sleeve and the end of the housing lie in a common plane transverse to the central axis of the housing, and seals are carried by the housing and the sleeve adjacent the ends thereof in contact with opposite sides of an annular chamber formed in the bottom of a recess of base structure. Hydraulic fluid is admitted into the chamber through a space between end portions of the sleeve and housing in a simplified fashion which eliminates the necessity of end caps mounted within the sleeve or conventional, relatively thick housing walls which are provided with a transverse passage for admitting hydraulic fluid into the chamber. A shoulder of the housing urges the sleeve into firm, sealing contact with the bottom of the annular chamber of the base structure during tightening of the housing into the threaded recess.

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First Claim