Bowling ball including a means for displacing the center of gravity
AssigneeThe United States of America as represented by the Department of Commerce
InventorSeppo I. Miettinen
Life of this patent
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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.
Claims4
In a bowling ball, a means for displacing the center of gravity, comprising
- - within the ball, substantially at its geometrical center, a three-way valve, wherefrom radiate three tubes with one closed end, at least one of these tubes lying substantially in the vertical plane passing through the geometrical centre of the ball and through the centermost of its three finger holes,
- - enclosed in said system of tubes and valve, a quantity of a heavy fluid substantially equivalent to the capacity of one tube and which can be selectively made to enter any one of said three tubes with the aid of the three-way valve and of gravity action, and a mechanical member shaped as a stem, with the aid of which the position of the three-way valve is controllable from the outer surface of the bowling ball.
Dependencies are inferred from the claim text.