Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Having tool-opposing – work-engaging surface
Patent
1994-11-18
1996-04-16
Howell, Daniel W.
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Having tool-opposing, work-engaging surface
408 91, 408DIG1, 269 21, 269 60, 269 71, B23B 4100
Patent
active
055076050
ABSTRACT:
A finger hole drilling machine for a bowling ball is disclosed. The drilling machine includes a ball seat assembly, an air suction/expelling valve unit, a marking pen assembly and a turntable assembly. The ball seat assembly has a ball seat housing of the box type for tilting the bowling ball forward and backward, and a ball seat movably placed on the ball seat housing and adapted for tilting the bowling ball leftward and rightward. The drilling machine identically drills the finger holes on a plurality of bowling balls of a bowler, thus to achieve identity of the finger holes of the bowling balls. The drilling machine also readily sets the drilling positions on the bowling balls, thus to save time and to readily finish the finger hole drilling work and to improve the efficiency of the finger hole drilling work.
REFERENCES:
patent: 1414970 (1922-05-01), Nelson
patent: 1616188 (1927-02-01), Hatcher
patent: 2146906 (1939-02-01), Moller
patent: 3714703 (1973-02-01), Maples
patent: 5409334 (1995-04-01), Edis et al.
patent: 5427478 (1995-06-01), Boucher et al.
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