Guiding disk for drilling holes on a bowling ball

Details Guiding disk for drilling holes on a bowling ball Guiding disk for drilling holes on a bowling ball

1996-11-15

1998-09-29

Fulton, Christopher W.

Geometrical instruments

Gauge

Bowling ball

33510, 33562, 33566, B43L 1320, G01B 314

Patent

active

058131299

ABSTRACT:
A guiding disk for accurately and quickly finding drill holes on a bowling ball, for finding hole positions for certain characteristics of pushaway on different bowling balls, and for avoiding positioning any hole above that of a weight in the bowling ball. The body of the guiding disk is a transparent domed plastic plate, having a reference hole and a plurality of radiant angular lines extending from the center of the reference hole. Among the radiant lines is a reference line provided at a location of zero degrees of radiant angle. Secondary spaced apart reference lines are also provided on the disk. With such a construction, positions of the holes to be drilled can be found very quickly.

REFERENCES:
patent: 3161041 (1964-12-01), Amburgey
patent: 3875668 (1975-04-01), Taylor
patent: 4742620 (1988-05-01), Manker
patent: 5181325 (1993-01-01), Damon
patent: 5456016 (1995-10-01), Ellison
patent: 5603165 (1997-02-01), Bernhardt et al.

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