Gauge to indicate a correct alignment for the thumb hole of a bowling ball
US5456016A · kind A · utility
Inventor
Key dates
| Filing date | Jun 23, 1994 |
| Grant date | Oct 10, 1995 |
| Priority date | — |
| Expiry date | Jun 23, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B5/0023
- WIPO fieldMeasurement
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.