Patent ID: 8499853
Filing Date: 2013-08-06
Classification: B25B

Abstract:
1. A hydraulic wrench having a proximal end and a distal end, comprising: a cylinder assembly disposed within a housing including first and second cylinders therein, wherein the first and second cylinders are arranged substantially in parallel, side by side, and include respective first and second fluid ports located at proximal ends of the respective cylinders and at the proximal end of the wrench; a swivel coupling first and second supply hoses to the cylinder assembly; a first piston, within the first cylinder, coupled to the first hose and to a drive train, the first piston operable to transmit force through the drive train to transmit torque to a fastener to be driven by the wrench upon extending out of the first cylinder; and a second piston, within the second cylinder, coupled to the second hose and to the drive train, and operable, upon extending out of the second cylinder, to transmit force through the drive train to force the first piston into a retracted position, without moving the fastener.