Adjustable thumb hole insert for bowling balls

Details Adjustable thumb hole insert for bowling balls Adjustable thumb hole insert for bowling balls

1994-11-21

1996-07-16

Pierce, William M.

Games using tangible projectile

Bowling

Ball

473130, A63B 3700

Patent

active

055362125

ABSTRACT:
An adjustable thumb hole insert for a bowling ball. A bowling ball having an oversized thumb hole has an adjustment cup positioned within it. The adjustment cup is tapered at the bottom and at the top. A thumb collet is positioned within the adjustment cup and has a generally cylindrical sidewall surrounding the thumb hole. The thumb collet is tapered at the bottom and at the top and is held in the over-sized thumb hole of the bowling ball. An adjustment screw is held in the bottom of the adjustment cup and when it is screwed downwardly it raises the adjustment cup which causes the thumb collet to squeeze inwardly, thereby reducing the inside diameter of the thumb hole. Conversely, when the adjustment screw is loosened, the inside diameter of the thumb hole increases.

REFERENCES:
patent: 2210528 (1940-08-01), Darby
patent: 2372958 (1945-04-01), Keith
patent: 3012783 (1961-12-01), Bunk et al.
patent: 3416796 (1968-12-01), Ginder
patent: 4561654 (1985-12-01), Haza
patent: 4968033 (1990-11-01), Alutto

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