Pressure actuated assembly extendable by fluid pressure and retractable by spring action
US4833973A · kind A · utility
18Cited by
17References
12Claims
0Family size
Inventor
Key dates
| Filing date | May 24, 1988 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | May 24, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF15B15/10
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fluid pressure actuated assembly includes a casing made of a flexible resilient material, such as rubber or polyurethane, a coiled tension spring sleeved on the casing for biasing the casing to move toward a retracted position, and a coiled spacing spring interposed between the tension spring and the casing for preventing any wall of the casing from being clamped between any two adjacent turns of the tension spring. When a compressed fluid is applied to the interior of the casing, the casing extends.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.