Cutting by use of rotating axially moving tool – Tool or tool with support – Including detailed shank
Patent
1992-11-12
1994-02-15
Howell, Daniel W.
Cutting by use of rotating axially moving tool
Tool or tool with support
Including detailed shank
279 194, 408239R, B23B 5102, B23B 3110
Patent
active
052861457
ABSTRACT:
A tool bit for use in a percussion drilling tool has a shank (11) insertable into a tool chuck. The shank (11) has two rotary entrainment grooves (14, 15), one smaller than the other with side flanks (16, 17) loaded during the drilling operation and not located diametrically opposite one another. In addition, the shank (11) has two locking grooves (12, 13). The rotary entrainment grooves (14, 15) are open at the end (18) of the shank insertable into the chuck, so that rotary entrainment members in the chuck can be inserted into the rotary entrainment grooves (14, 15). The locking grooves (12, 13) are closed at the ends adjacent the end (18) of the shank insertable into the chuck to assure that the tool bit is not displaced out of the chuck when the locking members are engaged. To prevent fatigue fractures or failure due to wear in the rotary entrainment grooves (14, 15) or stress peaks between the cross-sectional areas located between the locking grooves (12, 13) and the rotary entrainment grooves (14, 15), the locking grooves (12, 13) are not located diametrically opposite one another. The tool chuck contains only one locking member for reasons of manufacturing costs, and the locking member forms an angle smaller than 90.degree. with the smaller rotary entrainment member.
REFERENCES:
patent: 4691929 (1987-09-01), Neumaier et al.
patent: 4717292 (1988-01-01), Phillips
patent: 4943192 (1990-07-01), Lafforgue et al.
patent: 5028057 (1991-07-01), Wanner
patent: 5076371 (1991-12-01), Obermeier et al.
patent: 5174698 (1992-12-01), Obermeier
Hilti Aktiengesellschaft
Howell Daniel W.
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