Pressure-operated power wrench

Details Pressure-operated power wrench Pressure-operated power wrench

1991-01-14

1992-03-17

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5744, B25B 1346

Patent

active

050957805

ABSTRACT:
The pressure-operated power wrench is provided with an annular member (14) rotatably supported within a headpiece (10). The annular member (14) can be coupled to the bolt to be rotated and is taken along in a moving direction by a ratchet lever (18). The lever (18) is actuated by a hydraulically moved piston (40). The piston (40) has a first piston face (45) and a second piston face (47) arranged coaxially thereto. When the load moment is small, only the first piston face (45) is pressurized. When this pressure exceeds a limit value, a back-check valve (57) is opened whereby also the second piston face (47) is pressurized. In the phase wherein rotation for tightening a bolt is still easy, only a small quantity of oil need be moved. Thus, power and heat losses are small. Further, the easy-rotating phase is abbreviated by fast reciprocation of the piston.

REFERENCES:
patent: 4805496 (1989-02-01), Wagner et al.
patent: 5003847 (1991-04-01), Wagner
patent: 5005447 (1991-04-01), Junkers

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