Flasher switch vane structure
US4001747A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1975 |
| Grant date | Jan 4, 1977 |
| Priority date | — |
| Expiry date | Jun 23, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H37/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An improved self-biased vane structure normally buckled to an abnormal posture by a thermally expansible pull member comprises a piece of resilient sheet metal deformed downwardly relative to a horizontal reference plane between pairs of divergent creases which extend to opposite lateral edges of the piece from respective apex points spaced apart on the longitudinal center line thereof. The vane thus has a pair of triangular end panels between which there are oppositely sloped side or wing panels, and has a transversely, elastically bowed portion between the apex points. The bowed central portion may be creased longitudinally and/or formed with a central opening to give it selected buckling properties. The pull member extends centrally from end to end over the convex side of the vane; when it is heated, as by an electric current passing through it and the vane, the vane snaps toward its natural posture and brings the pull member into cooling contact with its central portion and its end panels.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.