Patent ID: 7225884
Filing Date: 2007-06-05
Classification: B25B,B25D

Abstract:
1. A hand power tool, comprising a power tool housing; a tool spindle supported rotatably in said housing; a drive train via which said tool spindle is drivable to rotate; a cam device located in said drive train and having two cam discs in engagement with one another for transmitting axial percussion motions to said tool spindle; an overloading coupling located in said drive train and having two coupling parts which are in engagement with one another and are overloadable counter to an axially exerted force; a coupling spring exerting said axial force; a blocking device which upon its activation blocks a relative rotation of said coupling parts of said overloading coupling to one another; and an operating mode setting device for setting “percussion drilling”, “drilling” and “screw driving” operating modes, and also a magnitude of an overloading moment upon screwdriving, said operating mode setting device having two adjusting rings located on said power tool housing and rotatable manually to define setting positions and acting on said cam device, said overloading coupling and said blocking device, wherein one of said adjusting rings is a torque adjusting ring and sets the “drilling” operating mode and the “screwdriving” operating mode, with preselection of the magnitude of the overloading moment, while the other of said adjusting rings is embodied as a function adjusting ring and switches the “percussion drilling” operating mode on and off, and in its position that switches the “percussion drilling” operating mode on, it overrides any operating mode set by said torque adjusting ring, wherein said torque adjusting ring has a plurality of setting positions and accesses said overloading coupling and said blocking device in such a way that in a setting position that sets the “drilling” operating mode, said blocking device is activated, and in other setting positions the blocking device is deactivated, and said coupling spring of said overloading coupling is prestressed variously strongly, said function adjusting ring having two setting positions and accesses said cam device and said blocking device in such a way that in one setting position said “percussion drilling” operating mode is switched on and said blocking device is activated, and in the another setting position, said percussion drilling function is switched off and said blocking device is deactivated.