Patent ID: 6295913
Filing Date: 2001-10-02
Classification: B25B

Abstract:
A compressed air-powered hydraulic torque wrench apparatus of the type having an air motor which drives a hydraulic pump for supplying hydraulic fluid under pressure to a hydraulic torque wrench and having controls including an advance actuator which when actuated supplies a flow of hydraulic fluid under pressure to said wrench to cause said wrench to advance in rotation, the improvement wherein said controls continue operation of said air motor after said advance actuator is deactuated and said wrench has terminated advancement in rotation to drive said hydraulic pump until a post-advance period of operation has expired, an immediate off actuator is provided for turning off said pump during said post-advance period and said controls prevent said pump from restarting if said immediate off actuator is deactuated before expiration of said post-advance period.