Method and device for the production of bores

Abstract

A method and a device are disclosed for the production of a bore with a special shape, for example a bore which deviates from a cylindrical shape or a bore with an undercut. First, a first bore portion is produced using an oscillatingly driven tool, the first bore portion having a shape deviating from a cylinder and having at least one projection projecting from the wall face of the first bore portion towards the bore centre. Subsequently, when a bore with an undercut is to be produced, the tool is then at least partially rotated about its longitudinal axis, in order to produce a second bore portion which has a larger cross section than the first bore portion.

1 . A tool for producing bores having a shape deviating from a cylinder, said tool comprising: 
 a shank having a first end and a second end, said first end being configured for chucking to an oscillatory drive;    a cutting head located at said second end and having at least one projection radially protruding from said shank; and    a cutting means provided on said cutting head.    
   
   
       2 . The tool of  claim 1 , wherein said cutting head comprises at least two projections being arranged at equal angular intervals in relation to one another, depressions being formed between adjacent projections.  
   
   
       3 . The tool of  claim 1 , wherein said cutting means is selected from the group formed by an abrasive cutting means and a cutting tooth.  
   
   
       4 . The tool of  claim 1 , wherein said cutting means is located on at least one end face of said at least one projection.  
   
   
       5 . The tool  claim 3 , wherein said cutting means comprises at least one cutting means selected from the group formed by a diamond cutting means, a boron carbide cutting means, and a corundum cutting means.  
   
   
       6 . The tool of  claim 1 , wherein said at least one projection has at least one outer surface having substantially the shape of a partial arc of a circle.  
   
   
       7 . The tool of  claim 1 , wherein said cutting head comprises at three projections being arranged at equal angular intervals in relation to one another, depressions being formed between adjacent projections, each of said projections comprising a radially outwardly protruding surface comprising an abrasive cutting means.  
   
   
       8 . The tool of  claim 7 , wherein each of said projections comprises a cutting means provided on an end surface of said projection facing away from said shank.  
   
   
       9 . The tool of  claim 7 , wherein each of said projections has at least one outer surface having substantially the shape of a partial arc of a circle.  
   
   
       10 . The tool  claim 7 , wherein said cutting means is selected from the group formed by a diamond cutting means, a boron carbide cutting means, and a corundum cutting means.  
   
   
       11 . The tool of  claim 10 , wherein each of said projections comprises a cutting means provided on an end surface of said projection facing away from said shank.  
   
   
       12 . The tool of  claim 1 , further comprising a drill attachment which is aligned with a central axis of said shank.  
   
   
       13 . The tool of  claim 1 , wherein said cutting means is designed as a cutting means selected from the group formed by a rock cutting means and a wood cutting means.  
   
   
       14 . A kit for producing bores having a shape deviating from a cylinder, said kit comprising: 
 a drill; and    a tool;    wherein said tool comprises a shank having a first end and a second end, said first end being configured for chucking to an oscillatory drive;    a cutting head located at said second end and having at least one projection radially protruding from said shank; and    a cutting means provided on said cutting head.    
   
   
       15 . A method for producing a bore, comprising the following step: 
 (a) producing a first bore portion using an oscillatingly driven tool, said first bore portion having a shape deviating from a cylinder and having at least one projection projecting from a wall face of said first bore portion towards a centre of said bore.    
   
   
       16 . The method of  claim 15 , in which, after a desired bore depth is reached, a second step is carried out: 
 (b) rotating the tool at least partially about its longitudinal axis for producing a second bore portion having a cross section being larger than a cross section of said first bore portion.    
   
   
       17 . The method of  claim 16 , wherein, in step (b), the tool is rotated by a method selected from the group formed by rotating by hand, driving in rotation and driving intermittently with a preferred direction.  
   
   
       18 . The method of  claim 15 , wherein a pre-bore is first made before performing step (a).  
   
   
       19 . The method of  claim 15 , wherein a pre-bore is made during step (a).  
   
   
       20 . The method of  claim 15 , wherein a tool is used for producing the bore comprising: 
 a shank having a first end and a second end, said first end being configured for chucking to an oscillatory drive;    a cutting head located at said second end and having at least one projection radially protruding from said shank; and    a cutting means provided on said cutting head. Express Mail No. EL  570   207   164  US