Hydraulic oil cylinder structure with reverse force function
US6401886B1 · kind B1 · utility
4Cited by
2References
2Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 18, 2001 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | Jan 18, 2021 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2022/0033
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The invention herein relates to a hydraulic oil cylinder structure with reverse force function comprises of a piston rod with one threaded end and ring base on the other end; the piston rod is housed in order with a elastic cushion, a cover body, a cushioning circle, a spring, a spring fastening member, a tension spring, a cushioning ring and a piston; when the piston rod is stepped downwards for physical exercise, the piston rod can resume automatically by the reverse force function of the tension spring to allow the exerciser to choose to operate by exercising with single foot, both feet up or both feet down.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.