Bowling ball including a means for displacing the center of grav

Details Bowling ball including a means for displacing the center of grav Bowling ball including a means for displacing the center of grav

1975-10-28

1977-11-15

Marlo, George J.

Amusement devices: games

Aerial projectile game; game element or accessory therefor...

Target

273DIG20, 273171, A63B 4304

Patent

active

040583104

ABSTRACT:
In the center of the bowling ball a three-way valve has been mounted and iating from this, three tubes closed at one end, one of the tubes lying substantially in the plane containing the line of throw while the other two are laterally directed on either side of said plane. The system of tubes and valve contains a quantity of mercury substantially equivalent to the capacity of one tube, and the mercury may by means of the three-way valve be transferred from the central tube into one or the other side tube and thereby the center of gravity shifted to one side. The three-way valve is controllable by means of a stem, from the surface of the ball. In an alternative embodiment all three tubes lie in the plane containing the line of throw.

REFERENCES:
patent: 746576 (1903-12-01), Rice
patent: 2432450 (1947-12-01), Sears
patent: 3591177 (1971-07-01), Skuse
patent: 3876212 (1975-04-01), Oppenheimer

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