Hydraulic wrench

Details Hydraulic wrench Hydraulic wrench

1993-03-02

1994-04-12

Meislin, D. S.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5724, B25B 1346

Patent

active

053015746

ABSTRACT:
A hydraulic wrench is provided of minimum external dimensions and yet constructed in a manner to be capable of exerting relatively high torsional forces. The wrench is constructed to be driven by a hydraulically reciprocal piston carrying a rack gear thereon with the rack gear meshed with a reciprocal sector gear having a pawl pivotally supported therefrom for driving a ratchet-type power wheel of the wrench. The wrench is provided with a variably positionable and reversable reaction bar or abutment assembly on the end thereof remote from the power wheel and the wrench further includes a secondary deactivatable ratchet pawl for preventing reverse rotation of the main ratchet-type drive wheel of the wrench.

REFERENCES:
patent: 3930776 (1976-01-01), Keller
patent: 3972242 (1976-08-01), Hunt
patent: 4266444 (1981-05-01), Anderson et al.
patent: 4336727 (1982-06-01), Junkers
patent: 4794825 (1989-01-01), Schmoyer
patent: 5090273 (1992-02-01), Fossella
patent: 5097730 (1992-03-01), Bernard et al.

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