Materials of the cylinders of active-piston actuators
US7569974B2 · kind B2 · utility
7Cited by
6References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 31, 2006 |
| Grant date | Aug 4, 2009 |
| Priority date | — |
| Expiry date | May 31, 2026 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16D2121/28
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
The invention concerns an actuator which includes a linear piston (2) in an active material, and an inner sliding cylinder (7, 7′) which includes an outer cylinder (5, 5′) in which the said sliding cylinder ((7, 7′) is pre-stressed, with one cylinder being in an anisotropic material with a negative or approximately zero expansion coefficient along at least one axis and a positive or approximately zero expansion coefficient on at least one other axis, and the other cylinder having a positive thermal or approximately zero expansion coefficient.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.