Patent ID: 7587964
Filing Date: 2009-09-15
Classification: B25B

Abstract:
1. A pneumatic power wrench, comprising: a housing with a pressure air supply passage, a motor, an adjustable pressure responsive shut-off valve located in the pressure air supply passage for limiting an output torque of the motor, said shut-off valve including a valve element, and a bias spring supported in one direction by the valve element and in an opposite direction by a movable spring support, and a manually operated torque setting mechanism arranged to set a position of said spring support in various positions, thereby varying a pre-tension of the spring for obtaining different output torque levels of the motor, wherein said torque setting mechanism comprises an adjustment unit rotatively journalled in the housing for rotation about an axis located at a lateral distance from said shut off valve and carrying two or more adjustable stop elements arranged to be selectively brought into engagement with said spring support, wherein each of said stop elements comprises a set screw for individual pre-setting of said stop elements at different positions corresponding to desired different output torque levels of the power wrench, and wherein each of said stop elements comprises a contact block with cam profiles that is coupled to said set screw and arranged to engage said spring support.