Hydraulic ratchet wrench with double-action hydraulic...

Details Hydraulic ratchet wrench with double-action hydraulic... Hydraulic ratchet wrench with double-action hydraulic...

2005-11-22

2005-11-22

Hail, III, Joseph J. (Department: 3723)

Tools

Wrench, screwdriver, or driver therefor

Machine

C173S206000, C173S218000

Reexamination Certificate

active

06966240

ABSTRACT:
The invention relates to a hydraulic ratchet wrench with a double-action hydraulic cylinder piston drive with a gear pump (20) and a piston pump (21). According to the invention, a working stroke and a return stroke are controlled through a reversal of rotational direction of a pump motor (4), whereby the necessary flow volume is produced automatically via internal flow control valves, and without additional valve controls.

REFERENCES:
patent: 4805496 (1989-02-01), Wagner et al.
patent: 5782158 (1998-07-01), Rothering
patent: 6012360 (2000-01-01), Concha
patent: 6029546 (2000-02-01), Gibson et al.
patent: 6295913 (2001-10-01), Rothering
patent: 6553873 (2003-04-01), Collins et al.

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