Hydraulic torque wrench

Details Hydraulic torque wrench Hydraulic torque wrench

1990-02-07

1991-01-08

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

B25B 1346

Patent

active

049826263

ABSTRACT:
A hydraulic torque wrench comprises a body member housing a piston-cylinder assembly and a drive member pivotal by the piston of the assembly about an axis radially spaced from the line of action of the piston, the drive member carrying a shaft or socket connected to the drive member by a ratchet connection. A spherical bearing member is mounted to the end of the piston for guided linear reciprocal movement therewith, a neck portion of the drive member being slidably received in a bore in the bearing member whereby, as the drive member is pivoted by movement of the piston, the neck portion of the drive member undergoes guided sliding movement in the bore of the bearing member, the bearing member rotating relative to the piston such that the perpendicular distance between the line of action of the piston and the pivot axis remains constant.

REFERENCES:
patent: 4765210 (1988-08-01), Merbach et al.
patent: 4825730 (1989-05-01), Junkers

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