Hand-Held Power Tool Driven By A Flow Medium

Abstract

Disclosed is a hand-held power tool with a housing ( 12 ) and a tool ( 70 )—a cutting tool, in particular—located thereon in a manner which allows it to be driven in a rotating and/or oscillating manner, it being possible to operate the tool ( 70 ) using a suction air flow, via a vacuum cleaner, in particular; the hand-held power tool is made particularly robust and safe against becoming clogged with chips by the fact that it is driven by a turbine ( 36 ) with a rotatable turbine wheel ( 38 ) and a stationary turbine housing ( 60 ); means ( ) are located between the turbine wheel ( 38 ) and the turbine housing ( 60 ) for carrying away dust and chips which accidentally enter this space.

1 . A hand-held power tool with a housing ( 12 ) and a tool ( 70 )—a cutting tool, in particular—located thereon in a rotatable manner, it being possible to operate the tool ( 70 ) using a suction air flow, via a vacuum cleaner, in particular,
 wherein   a turbine ( 36 ) with a rotatable turbine wheel ( 38 ) and a stationary turbine housing ( 60 ) is used as the drive, and means ( 100 ) are located between the turbine wheel ( 38 ) and the turbine housing ( 60 ) for carrying away particles ( 108 ), such as dust and chips, which accidentally enter this space.   
   
   
       2 . The hand-held power tool as recited in  claim 1 ,
 wherein   the means ( 100 ) are designed as at least one opening ( 102 ) which passes through the turbine housing ( 60 ).   
   
   
       3 . The hand-held power tool as recited in  claim 1 , wherein
 the means ( 100 ) are surface recesses ( 103 ) and/or raised surface roughness in the turbine wheel ( 38 )—adjacent to the opening ( 102 ) of the turbine housing ( 60 ) in particular—for carrying the particles along and creating a preferably pulsing airstream toward the opening ( 102 ) to blow the particles outward through this opening ( 102 ).   
   
   
       4 . The hand-held power tool as recited in  claim 1 ,
 wherein   the turbine ( 36 ) is provided with means for eliminating the swirling of the inflowing and outflowing air, in particular a guide-blade row ( 74 )—and/or a rear guide grid; the airstream flowing onto the turbine wheel ( 38 ) is forwarded or redirected at an acute angle to the normal axis ( 40 ) of the turbine wheel ( 38 ), at an angle of 50° in particular.   
   
   
       5 . The hand-held power tool as recited in  claim 1 ,
 wherein   the turbine wheel ( 38 ) is provided with a labyrinth seal ( 51 ) which protects the turbine ( 36 ) against loss of pressure.   
   
   
       6 . The hand-held power tool as recited in  claim 1 ,
 wherein   the guide-blade row ( 74 ) serves as a bearing seat ( 76 ) for a bearing ( 66 ) of the drive shaft ( 72 ).   
   
   
       7 . The hand-held power tool as recited in  claim 1 ,
 wherein   it includes a balancing mass ( 78 ) which, together with structures ( 80 ,  82 ) of the guide-blade row ( 74 ), forms a labyrinth seal ( 84 ).   
   
   
       8 . The hand-held power tool as recited in  claim 1 ,
 wherein   the guide-blade row ( 74 ) is installed in the structure of the housing ( 12 ) such that it reinforces it.   
   
   
       9 . The hand-held power tool as recited in  claim 1 ,
 wherein   the air for driving the turbine wheel ( 38 ) is directed from the outside onto the turbine ( 36 ) radially outwardly in the direction of rotation of the turbine ( 36 ), and, therefore, radially diagonally, and is subsequently drawn in temporarily axially by the outer edge of the turbine wheel ( 38 ).   
   
   
       10 . The hand-held power tool as recited in  claim 1 ,
 wherein   it is designed as a surface grinding machine, a finishing sander in particular.   
   
   
       11 . The hand-held power tool as recited in  claim 1 ,
 wherein   downwardly guiding channels are located next to the openings ( 102 ) between the turbine housing ( 60 ) and the housing ( 12 ) for removal of the chips which exit through the openings ( 102 ).   
   
   
       12 . The hand-held power tool as recited in  claim 1 ,
 wherein   inspection flaps ( 15 ) for openings are located on the housing ( 12 ) near the openings ( 102 ), through which accumulated chips can be removed by hand from the outside.