Patent ID: 6012360
Filing Date: 2000-01-11
Classification: B25B,E21B

Abstract:
A hydraulic wrench for loosening a screw joint between two threaded components, comprising:a base;a swinging body pivotally mounted to said base;a clamp support movably connected to said swinging body, said clamp support having at least one clamp for gripping one of said threaded components;a lever pivotally attached to said clamp support, said lever having a clamp for gripping said one threaded component;a first means to bias said clamp support toward a retracted position with respect to said swinging body;a second means to bias said lever toward an open position with respect to said clamp support;a hydraulic cylinder having a first end connected to said base and a second end connected to said lever;said hydraulic cylinder simultaneously producing gripping force on and torque to one of the threaded components, said gripping force varying proportionally with the torque.