Cutting by use of rotating axially moving tool – Tool or tool with support – Including detailed shank
Patent
1994-12-09
1996-05-21
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Including detailed shank
279 19, 408240, B23B 5100, B23B 3122
Patent
active
055183450
ABSTRACT:
A tool bit for insertion into a tool bit chuck in a manually operated tool used for chiseling and/or percussion drilling includes a chucking shank (6). The chucking shank has two rotary entrainment grooves (7) located diametrically opposite one another and open at the end of the chucking shank to be inserted into the chuck. A pair of locking grooves (8) are located diametrically opposite one another. Axially extending grooves (9) overlap at least part of the pair of locking grooves (8) so that end faces (8a) are formed extending transversely of the axial projection and facing away from the end of the chucking shank to be inserted into the chuck. While the axially extending grooves (9) afford improved transmission of the required torque, additional locking grooves (10) overlapping the rotary entrainment grooves (7) are provided for improving absorption of axial forces with the additional locking grooves (10) forming end faces (10a) directed away from the end of the chucking shank (6) to be inserted into the chuck.
REFERENCES:
patent: 4943192 (1990-07-01), Lafforgue et al.
patent: 5397203 (1995-03-01), Kleine et al.
Hilti Aktiengesellschaft
Howell Daniel W.
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