Geometrical instruments – Gauge – Bowling ball
Patent
1994-06-23
1995-10-10
Fulton, Christopher W.
Geometrical instruments
Gauge
Bowling ball
33562, 473128, G01B 314, G01B 356, G01B 525
Patent
active
054560160
ABSTRACT:
A gauge for indicating the correct alignment for a thumb hole of a bowling ball having a ring with a circular abutment section having a central axis, the ring having an aperture through the opening inside the abutment section, the ring also having a circular track concentric and coaxial with the central axis and angular indicia on the ring. A fin is attached to the ring extending in a plane which includes the central axis. A thumb plate having a periphery which fits and rotates in the track, the thumb plate having a centrally located thumb aperture with a boundary having a generally flattened portion against which the top of the thumb will bear and an opposite generally rounded portion against which the bottom of the thumb will bear, the thumb plate also having an index mark to align with the angular indicia on the ring to indicate the correct angular orientation of the thumb hole to be drilled in the bowling ball.
REFERENCES:
patent: 2349394 (1944-05-01), Widdis
patent: 3182404 (1965-05-01), Fleming et al.
patent: 3415146 (1968-12-01), Schroeder, Jr.
patent: 3875668 (1975-04-01), Taylor
patent: 5181325 (1993-01-01), Damon
Fulton Christopher W.
Mon Donald D.
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