Hand-held power tool device

#This application is based on German Patent Application 10 2009 054 929.3 filed on Dec. 18, 2009.

#1. Field of the Invention

#The invention is based on a hand-held power tool device equipped with a locking device, which is for locking an output device and has at least one locking element for supporting at least one radial clamping force.

#The invention will be better understood and further objects and advantages thereof will become more apparent from the ensuing detailed description of preferred embodiments taken in conjunction with the drawings, in which:

#FIG. 1 shows a hand-held power tool equipped with a hand-held power tool device according to the invention;

#FIG. 2 shows a detail of a longitudinal section through the hand-held power tool from FIG. 1; and

#FIG. 1 schematically depicts a hand-held power tool embodied in the form of a cordless impact drill/screwdriver 34a, having a drive motor 38a that is accommodated in a machine housing 36a and is able to drive an output shaft 18a of an output device 17a via a planetary gear set 40a that is not depicted in detail (FIGS. 1 and 2). The output shaft 18a has a clamping chuck 42a fastened to it. The clamping chuck 42a has a clamping device 44a that can be actuated in order to fasten a tool in the rotation direction 46a around a rotation axis 28a of the output device 12a relative to the machine housing 36a.

#The hand-held power tool also has a hand-held power tool device with a locking device 10a for locking the output shaft 18a of the output device 12a (FIG. 2). The locking device 10a is used to couple the output shaft 18a in a rotationally fixed fashion in relation to the machine housing 36a when the tool is being clamped and released by means of the clamping device 44a. The locking device 10a is automatically opened or more precisely stated, automatically releases the output shaft 18a, when a torque is transmitted from the drive motor 38a to the clamping chuck 42a and is automatically closed or more precisely stated, automatically immobilizes the output shaft 18a, when a torque is transmitted from the clamping chuck 42a to the drive motor 38a.

#The locking device 10a includes a locking element 14a, which is embodied in the form of a clamping ring, for supporting radial clamping forces 16a. Inside the locking element 14a, clamping elements 48a are situated between the locking element 14a and the output shaft 18a and, in order to lock the output shaft 18a when a torque is transmitted from the clamping chuck 42a to the drive motor 38a, are moved in the circumference direction into tapering gaps, thus producing the radial clamping forces 16a and locking the output shaft 18a in the rotation direction 46a. The clamping elements 48a are embodied in the form of rollers. When a torque is transmitted from the drive motor 38a to the clamping chuck 42a, the clamping elements 48a are carried along by catch elements 50a of a catch device 52a so that the clamping elements 48a are prevented from jamming inside the locking element 14a. The catch device 52a is embodied of one piece with a planet carrier of the planetary gear seat 40a.