Cutting by use of rotating axially moving tool – With means to apply transient – fluent medium to work or product – Including tool with duct
Patent
1991-03-21
1992-03-03
Bishop, Steven C.
Cutting by use of rotating axially moving tool
With means to apply transient, fluent medium to work or product
Including tool with duct
175214, 408 72R, 408202, 408226, 4082415, B23B 5106
Patent
active
050927175
ABSTRACT:
The device for producing a drilled hole with an undercut includes a drilling tool having 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 a lateral connecting pipe for a cooling and flushing liquid. So that the drilled hole with the undercut can be made in a single working step using the same drilling tool, the shank of the drilling tool (2) is provided with a stop collar (12) and also a cross-sectionally enlarged portion (17). The shank of the drilling tool (2) tapers uniformly toward the drilling head (11) and also tapers uniformly toward the stop collar (12). The shank is provided with a plurality of longitudinally extending helical grooves at least in the vicinity of the enlarged portion so that the enlarged portion can act together with the wall of the drilled hole as a pivot during formation of the undercut.
REFERENCES:
patent: 3259403 (1966-07-01), Hjalsten et al.
patent: 3555937 (1971-01-01), Nicodemas
patent: 4585256 (1986-04-01), Rassieur et al.
patent: 4962820 (1990-10-01), Fischer
patent: 4993894 (1991-02-01), Fischer et al.
Bishop Steven C.
fischerwerke Artur Fischer GmbH & Co. KG
Striker Michael J.
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