Hand machine tool

Abstract

A hand-operated machine tool is disclosed that rotationally drills or percussively chips or both. An embodiment of the hand-operated machine tool includes a toolholder that is used to hold tools having a grooved shank. The toolholder has a toolholder body and at least one radially moving locking member, for example a locking sphere, that is insertable into a groove in the tool and the locking member is radially locked in position by a retaining element that may be displaced by an actuating element to a position that radially releases the locking member. In an embodiment of the invention, the toolholder has at least one sealing device that seals at least one chamber outwardly surrounding the locking member. The sealing device includes at least one sleeve-shaped component that is separate from the actuating element and at least partially defines the volume referred to as the chamber.

What is claimed is:  
     
         1 . A hand-operated machine tool, in particular a drilling and/or chipping hammer, comprising a percussively and/or rotationally driven toolholder ( 10 ), which is used to hold tools having a grooved shank and includes a toolholder body ( 12 ) having at least one radially moving locking member ( 14 ), which in turn is insertable into a groove of the tool closed at the shank end and is held in its locked position by a retaining element ( 16 ) that may be placed by an actuating element ( 18 ) in a position that radially releases the locking member ( 14 ); and comprising at least one sealing device ( 20 ,  22 ,  24 ,  26 ,  28 ) that outwardly seals at least one chamber ( 30 ,  32 ) surrounding a locking member ( 14 ), 
 wherein the sealing device ( 20 ,  22 ,  24 ,  26 ,  28 ) has at least one sleeve-shaped component ( 34 ,  36 ,  38 ,  40 ,  42 ,  44 ) that is separate from the actuating element ( 18 ) and at least partially delimits the chamber ( 30 ,  32 ) in the radial direction.    
     
     
         2 . The hand-operated machine tool according to  claim 1 , wherein the actuating element ( 18 ) has least one radial distance ( 110 ) from the sleeve-shaped component ( 34 ,  36 ,  38 ,  40 ,  42 ,  44 ).  
     
     
         3 . The hand-operated machine tool according to  claim 1  or  2 , wherein the sealing device ( 20 ,  22 ,  24 ,  26 ,  28 ) has at least one sleeve-shaped, elastically deformable component ( 34 ,  36 ,  38 ,  40 ,  42 ).  
     
     
         4 . The hand-operated machine tool according to one of the preceding claims, 
 wherein at least one sealing surface pair ( 48 ,  50 ,  52 ) is held together by a compression spring ( 46 ) that holds the retaining element ( 16 ) in its retaining position.    
     
     
         5 . The hand-operated machine tool according to  claim 4 , wherein the sleeve-shaped component ( 38 ) surrounds the compression spring ( 46 ) and seals its ends against neighboring components ( 54 ,  56 ).  
     
     
         6 . The hand-operated machine tool according to one of the preceding claims, 
 wherein one sealing surface pair ( 58 ,  60 ) is situated axially in front of the locking member ( 14 ) and one sealing surface pair ( 62 ,  64 ) is situated axially behind the locking member ( 14 ), and, in the case of both sealing surface pairs ( 58 ,  60 ,  62 ,  64 ), one sealing surface is formed by the toolholder body ( 12 ) or by a component ( 54 ,  66 ) attached to the toolholder body ( 12 ).    
     
     
         7 . The hand-operated machine tool according to one of the preceding claims, 
 wherein a lubricant is introduced into the chamber ( 30 ,  32 ).    
     
     
         8 . The hand-operated machine tool according to one of the preceding claims, 
 wherein at least one sleeve-shaped component ( 40 ,  42 ) engages with at least one groove ( 68 ) in the toolholder body ( 12 ).    
     
     
         9 . The hand-operated machine tool according to one of the preceding claims, 
 wherein a labyrinth seal ( 72 ) is situated between the actuating element ( 18 ) and a neighboring component ( 70 ).