Cutting by use of rotating axially moving tool – Tool or tool with support – Including detailed shank
Patent
1994-05-03
1995-04-11
Bishop, Steven C.
Cutting by use of rotating axially moving tool
Tool or tool with support
Including detailed shank
279 83, 407 30, 408239A, 451541, B23B 5100, B23B 5112
Patent
active
054052211
ABSTRACT:
A tool bit includes a shaft portion having an adaptor end and a working end and a middle segment connecting the adaptor end and the working end, the middle segment having an average radius and a longitudinal axis, an adaptor base having an axial bore for receiving the adaptor end and having a fastening structure for removably securing the adaptor end within the axial bore, where the adaptor base has an average radius which is at least two times the average radius of the shaft portion middle segment, for enhanced tool bit stability, and where the adaptor base includes a lateral chuck engaging surface adapted to abut during rotational loading of the tool bit a corresponding lateral adaptor base engaging surface within a power tool chuck, and to abut the adaptor base engaging surface at a distance from the shaft portion longitudinal axis of at least two times the average radius of the middle segment so that the chuck engaging surface lockingly abuts the adaptor base engaging surface with a substantial moment, to resist adaptor base stripping and slipping, and to further enhance tool bit rotational stability. The chuck engaging surface preferably includes a substantially planar lateral face and the adaptor base engaging surface within the chuck also preferably includes a substantially planar lateral face.
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Ducker, III Andrew L.
Ducker, Jr. Andrew L.
Bishop Steven C.
Kubler Frank L.
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