Torque wrench

Details Torque wrench Torque wrench

1990-04-06

1991-04-09

Smith, James G.

Tools

Wrench, screwdriver, or driver therefor

Machine

B25B 1346

Patent

active

050054473

ABSTRACT:
A torque wrench for tightening or loosening of threaded connectors comprises a turnable engaging unit arranged to be turned and to engage threaded connector so as to tighten or loosen the latter in response to turning of the engaging unit, and a power drive unit for turning the engaging unit, the power drive unit including fluid-operated cylinder piston unit provided with a cylinder and two pistons, the pistons being movable independently of one another, so that when one piston with its smaller piston area is moved it applies a smaller pressure to the engaging unit to provide a smaller torque, while when both the pistons with a greater combined piston area are moved together they apply a greater pressure to the engaging unit to provide a greater torque.

REFERENCES:
patent: 4524651 (1988-06-01), Dubiel et al.

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