Device for making a drilled hole with an undercut

专利名称：Device for making a drilled hole with an

undercut

发明人：Artur Fischer申请号：US07/674068申请日：19910321公开号：US05092717A公开日：19920303

摘要：The device for producing a drilled hole with an undercut includes a drilling toolhaving a shank and a drilling head faced with a plurality of diamond chips, a drilling tool-holder structured to hold the drilling tool and a rotatable sleeve having an axial

throughgoing passage for the drilling tool and the drilling tool-holder and also having alateral connecting pipe for a cooling and flushing liquid. So that the drilled hole with theundercut can be made in a single working step using the same drilling tool, the shank ofthe drilling tool (2) is provided with a stop collar (12) and also a cross-sectionallyenlarged portion (17) . The shank of the drilling tool (2) tapers uniformly toward thedrilling head (11) and also tapers uniformly toward the stop collar (12). The shank isprovided with a plurality of longitudinally extending helical grooves at least in the vicinityof the enlarged portion so that the enlarged portion can act together with the wall ofthe drilled hole as a pivot during formation of the undercut.

申请人：FISCHERWERKE ARTUR FISCHER GMBH & CO. KG

代理人：Michael J. Striker

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