Manually actuated hydraulic jack for compressively applying term

Details Manually actuated hydraulic jack for compressively applying term Manually actuated hydraulic jack for compressively applying term

1982-12-27

1985-01-08

Crane, Daniel C.

Metal deforming

With means to drive tool

Including pneumatic- or fluid-actuated tool support

7245316, 72410, 81301, 29751, 60477, B21J 918

Patent

active

044921063

ABSTRACT:
The jack comprises a fixed jaw, rigidly associated with the jack body, and a movable jaw facing said fixed jaw and being connected to a piston sealingly movable inside a cylindrical chamber. In the body, first and second chambers are provided, respectively in communication, through a first delivery conduit and first intake conduit, and through a second delivery conduit and second intake conduit, with the cylindrical chamber and a working fluid reservoir, in the first chamber there being sealingly movable a high pressure piston, whereto is connected a lug passed through the second chamber in sealed relationship therewith, wherein it acts by contact on an elastically biased low pressure piston, the high pressure piston being connected at the free end thereof to an actuating lever handle.

REFERENCES:
patent: 2688231 (1954-09-01), Northcutt
patent: 2845033 (1958-07-01), Wright
patent: 3674381 (1972-07-01), Schiff
patent: 4132107 (1979-01-01), Suganuma et al.

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