Flow medium-driven hand-held power tool

Abstract

A hand-held power tool, having a housing ( 12 ) and a tool ( 70 ) which is located on the housing in a way drivable to rotate and/or oscillate and is drivable as intended by means of a flow of suction air, especially with a vacuum cleaner, is made especially effective in that a turbine ( 36 ) with a turbine wheel ( 38 ) serves as the drive mechanism and is provided with means for calming the inflowing and outflowing air, in particular with an upstream baffle ( 74 ) and/or a downstream baffle, and the air flow approaching the turbine wheel ( 38 ) is carried onward or deflected at an acute angle to the vertical axis ( 40 ) of the turbine wheel ( 38 ), in particular an angle of less than 50°.

1 . A hand-held power tool, having a housing ( 12 ) and a tool ( 70 ), which is located on the housing in a manner capable of being driven in rotating and/or orbiting fashion and which can be operated as intended by means of a flow of suction air, especially with a vacuum cleaner, characterized a turbine ( 36 ) with a turbine wheel ( 38 ) serves as the drive mechanism and is provided with means for calming the inflowing and outflowing air, in particular with an upstream baffle ( 74 ) and/or a downstream baffle, and the air flow approaching the turbine wheel ( 38 ) is carried onward or deflected at an acute angle to the vertical axis of the turbine wheel ( 38 ), in particular an angle of less than 50°. 
   
   
       2 . The hand-held power tool as defined by  claim 1 , characterized in that the turbine wheel ( 38 ) is provided by a labyrinth seal ( 51 ), which protects the turbine ( 36 ) against a pressure loss. 
   
   
       3 . The hand-held power tool as defined by  claim 1 , characterized in that the upstream baffle ( 74 ) serves as a bearing seat ( 76 ) for a bearing ( 66 ) of the axial shaft ( 72 ). 
   
   
       4 . The hand-held power tool as defined by  claim 1 , characterized in that it has a downstream baffle ( 78 ), which together with structures ( 80 ,  82 ) of the upstream baffle ( 74 ) forms a labyrinth seal ( 84 ). 
   
   
       5 . The hand-held power tool as defined by  claim 1 , characterized in that the upstream baffle ( 74 ) is built into the structure of the housing ( 12 ) in such a way that it reinforces the housing. 
   
   
       6 . The hand-held power tool as defined by  claim 1 , characterized in that the air for driving the turbine wheel ( 38 ) is made to pass radially outward past it and is then extracted by suction radially obliquely inward from the outer edge of the turbine wheel ( 38 ). 
   
   
       7 . The hand-held power tool as defined by  claim 1 , characterized in that the housing ( 12 ) has a radio switch, with which a counterpart switch that switches the vacuum cleaner on and off is actuatable and thus the hand-held power tool is simultaneously capable of being switched on and off. 
   
   
       8 . The hand-held power tool as defined by  claim 1 , characterized in that it is designed as a surface sander, in particular as an orbital sander.