Pressure-operated power wrench

Details Pressure-operated power wrench Pressure-operated power wrench

1991-01-14

1992-04-14

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

81 5744, B25B 1346

Patent

active

051036967

ABSTRACT:
The power wrench is provided with two pistons (38,41) arranged within each other. The pistons (38,41) abut against a pressure member (26) for pivoting a lever (18). The lever (18) is connected by an annular member (14) to the bolt head to be rotated. In a working stroke, the path of the first piston (38) is limited in that this piston impinges onto an abutment (46) while the second piston (41) moves on. The largest part of the working stroke is performed exclusively by the second piston (41) and thus is effected with low hydraulic throughput. When the force of the second piston (41) is not sufficient anymore, the working strokes are performed by both pistons (38,41) in common over the shorter piston path.

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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