Patent ID: 9056390
Filing Date: 2015-06-16
Classification: B25B

Abstract:
1. A power wrench comprising: a housing having a forwardly extending tubular neck portion; a motor; an output shaft extending coaxially through the neck portion and adapted to be connected to a screw joint; and a torque reaction bar supported on the neck portion via a splines coupling including axially directed keyways for rotationally locking the torque reaction bar relative to the housing; wherein the neck portion comprises at a forward-most part thereof a threaded section, and a nut assembly engaging said threaded section for axially clamping the torque reaction bar to the housing; wherein said nut assembly is provided with a lock mechanism including at least one lock pin disposed in parallel with the output shaft and movable between a release position and a lock position; wherein said at least one lock pin is arranged to positively engage with the splines coupling keyways in said lock position to thereby lock said nut assembly against rotation; wherein said nut assembly comprises a nut element to be engaged with the threaded section, and said lock mechanism comprises a maneuver ring which is axially displaceable and rotatively locked relative to the nut element; and wherein said maneuver ring is connected to said at least one lock pin and arranged to shift via an axial displacement said at least one lock pin between said release position and said lock position.