Bistable SME actuator with retainer
US4887430A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 21, 1988 |
| Grant date | Dec 19, 1989 |
| Priority date | — |
| Expiry date | Dec 21, 2008 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2061/0122
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
In a bistable shape memory effect, SME, mechanism having first and second opposing shape memory effect, SME, elements (16, 20) moving an actuator (12) along a travel stroke between respective first and second positions upon heating of the respective SME element above its transition temperature mechanical frictional retainers are provided for holding the actuator at the end of its travel stroke, including after cooling of the respective SME element and return repose movement thereof. One embodiment provides a detent retainer (38, 40, 42, 44, 46). Another embodiment provides a friction wedge retainer (12a, 12b, 14a, 14b, 12c, 12d, 14c, 14d). Another embodiment provides a resiliently biased friction member (50, 52) and a lost motion coupling (56, 58) between the actuator and the SME elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.