Impact driver having an impact mechanism

Abstract

In an impact driver including an impact mechanism for percussive driving of an output drive shaft on which is provided a tool receptacle for receiving an inserted tool, the tool receptacle is embodied as a clamping chuck, a permanent connection being embodied between the clamping chuck and the output drive shaft in order to prevent at least tool-free detachment of the clamping chuck from the output drive shaft.

What is claimed is: 
     
         1 . An impact driver, comprising:
 an impact mechanism for percussive driving of an output drive shaft on which is provided a tool receptacle for receiving an inserted tool;   wherein the tool receptacle is a clamping chuck, a permanent connection being embodied between the clamping chuck and the output drive shaft to prevent at least tool-free detachment of the clamping chuck from the output drive shaft.   
     
     
         2 . The impact driver of  claim 1 , wherein the impact mechanism includes a mechanical impact mechanism having a spring-loaded impact member having at least one input drive cam, the output drive shaft having at least one output drive cam. 
     
     
         3 . The impact driver of  claim 1 , wherein the output drive shaft has at least one axial internal recess having an internal thread, and wherein an external thread is embodied on the external periphery of the output drive shaft, the internal thread and the external thread having counterdirectional screw threads. 
     
     
         4 . The impact driver of  claim 3 , wherein the clamping chuck has a clamping chuck body equipped with an axial passthrough opening and an internal thread, the internal thread being embodied for thread-joining to the external thread of the output drive shaft and the axial passthrough opening being equipped for passage of a screw equipped with an external thread, and the external thread of the screw being embodied for thread-joining to the internal thread of the output drive shaft. 
     
     
         5 . The impact driver of  claim 2 , wherein the output drive shaft is embodied in at least two pieces and has an output drive stud and a cam member having at least one output drive cam, the output drive stud being fastened via a rigid connection on the clamping chuck and being connected nonrotatably to the cam member. 
     
     
         6 . The impact driver of  claim 5 , wherein the output drive stud has, at its axial end connected to the cam member, a rotationally entrained member that engages in a rotationally secured manner into a rotationally entraining member correspondingly embodied on the cam member. 
     
     
         7 . The impact driver of  claim 6 , wherein the rotationally entrained member is embodied in the manner of a polygonal contour on the external periphery of the output drive stud, and the rotationally entraining member is provided in the manner of a polygonal opening on the cam member. 
     
     
         8 . The impact driver of  claim 5 , wherein the cam member is fastened on the output drive stud via a securing member. 
     
     
         9 . The impact driver of  claim 8 , wherein the securing member is disposed on a side of the cam member facing toward the impact member. 
     
     
         10 . The impact driver of  claim 8 , wherein the securing member is disposed on a side of the cam member facing away from the impact member. 
     
     
         11 . The impact driver of  claim 9 , wherein the securing member is embodied in the manner of a securing ring that is disposed in an annular groove provided on the output drive stud. 
     
     
         12 . The impact driver of  claim 1 , wherein the output drive shaft embodies a rotationally entraining member and has at least one radial passthrough opening. 
     
     
         13 . The impact driver of  claim 12 , wherein the clamping chuck has a clamping chuck body on which is provided a radial opening oriented in alignment with the radial passthrough opening of the output drive shaft, and which embodies a rotationally entrained member into which the rotationally entraining member embodied on the output drive shaft engages in rotationally secured fashion. 
     
     
         14 . The impact driver of  claim 13 , wherein for rotationally secured fastening of the clamping chuck body on the output drive shaft, an at least locally peg-shaped securing member is disposed in the radial passthrough opening of the output drive shaft and at least locally in the radial opening of the clamping chuck body. 
     
     
         15 . The impact driver of  claim 14 , wherein an O-shaped securing ring is disposed in the region of the peg-shaped securing member on the clamping chuck body to immobilize the peg-shaped securing member in the radial opening of the clamping chuck body and in the radial passthrough opening of the output drive shaft.