Torsion spring type wrist exercising device
US4155547A · kind A · utility
21Cited by
5References
9Claims
0Family size
Inventors
Key dates
| Filing date | Sep 27, 1977 |
| Grant date | May 22, 1979 |
| Priority date | — |
| Expiry date | Sep 27, 1997 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B21/0455
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
An arm exercising device for strengthening of the wrist, forearm and elbow, the invention comprises a pair of longitudinally aligned tubular members movable axially relative to each other, such movement being resisted by an adjustable spring force. A spring system has its length varied to adjust the tension, and thus the torsion of said spring system, one of the tubular members preferably being formed of a clear material in order that the adjustment can be visually observed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.