Thumb pitch compensating span gauge

Details Thumb pitch compensating span gauge Thumb pitch compensating span gauge

1979-06-13

1981-03-24

Stearns, Richard R.

Geometrical instruments

Area integrators

Electrical

33178B, 273 54R, G01B 502

Patent

active

042571650

ABSTRACT:
A span gauge for measuring the distance between a thumb hole and a finger hole on a bowling ball comprised of a plate having a curved edge fitting the contour of the bowling ball and an angle positioning post pivotally attached to the edge of the plate. The radius of curvature on the curved edge is equal to the radius of curvature of the surface of the bowling ball and the pivoting post is attached to one end of the curved edge. A calibrated scale on the curved edge permits measurement by inserting the pivoted post in a pre-drilled thumb hole to determine the point at which the finger hole is to be drilled. The pivoted post allows the span gauge to compensate for the pitch angle of pre-drilled thumb holes which may vary from ball to ball.

REFERENCES:
patent: 754513 (1904-03-01), Swenson
patent: 3276134 (1966-10-01), Szwajkowski
patent: 3429049 (1969-02-01), Snoddy

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