Bat swing practice apparatus
US4907800A · kind A · utility
38Cited by
7References
16Claims
0Family size
Inventors
Key dates
| Filing date | Sep 24, 1987 |
| Grant date | Mar 13, 1990 |
| Priority date | — |
| Expiry date | Sep 24, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B21/0088
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
The training aid has a handle with a fan section at its far end. The fan section provides resistance to swinging the handle. The fan section has a rotatable fan and a friction element which varies the rotational resistance of the fan.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.