Vacuum vice for bowling balls

Details Vacuum vice for bowling balls Vacuum vice for bowling balls

1994-08-26

1995-04-25

Briggs, William

Gear cutting, milling, or planing

Milling

Process

269 21, 408 1R, 409225, B23C 300, B23B 3500, B25B 1100

Patent

active

054093341

ABSTRACT:
A vacuum vice for holding a bowling ball when drilling holes or engraving the ball includes inner and outer o-rings seals which form two vacuum chambers that work together to form a seal with a bowling ball having surface imperfections or engraving. The inner vacuum chamber holds the ball to a buoyant cup. The outer vacuum chamber seats the ball against a contoured, hard rim surface and is connected by a leakage path around the inner seal to a piston chamber which pulls on the buoyant cup to further seat the ball. The outer seal is mounted on a movable housing that automatically adjusts to the size of the ball.

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