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专利名称：Drilling device for making holes with
undercuttings
发明人：EISCHEID, KARL申请号：EP92103731.3申请日：19920305公开号：EP0508103B1公开日：19950118
摘要：Drilling device (90) for making undercut holes, having a drill (15), the drillingshank (19) of which has a side cutting edge (14), projecting radially beyond the periphery(18) of the drilling shank, and a flat on its periphery (18) opposite the side cutting edge(14), which flat enables the side cutting edge (14) to be inserted into the hole, and isfirmly connected to an articulated connecting coupling (20) which permits wobbling shankmovements during the rotation of the drill (15), is arranged between the drill (15) and adrill drive and has a coupling piece (28) on the drill-drive side with an axially movablepressure body (85) which can be supported on an inclined surface (17) of a coupling piece(29) connected to the drilling shank (19), which inclined surface (17) effects a radialadvance of the side cutting edge (14). In order to improve a drilling device (90) having thefeatures mentioned at the beginning in such a way that the drill (15) can be positivelyguided against radial movements when the pilot hole (12) is being made in the workpiece(46) by axial feed of the drill (15) or can be pulled out of the completed undercut holeeven if self-alignment, effected by centrifugal force, of the coupling piece (29) on thedrilling-shank side is not possible or is not possible to an adequate degree, this device isdesigned in such a way that the pressure body (85) axially overlaps the coupling piece
(29) on the drilling-shank side in a position not acted upon axially and is radially coupledin a positive-locking manner to this coupling piece (29).
申请人：EISCHEID, KARL,EISCHEID KARL,EISCHEID, KARL
地址：DE
国籍：DE
代理机构：Eichler, Peter, Dipl.-Ing.
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