Telescopic spring operable as an electric switch
US4237353A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 24, 1978 |
| Grant date | Dec 2, 1980 |
| Priority date | — |
| Expiry date | Nov 24, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H13/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A telescopic spring has an outer spring member and an inner spring member movable inward and outward of a cavity in the outer spring member. Fasteners on the spring members outside the cavity permit the spring members to be fastened to respective objects. A compressed gas in the cavity outwardly biases the inner spring member. One of the spring members carries a contact element which engages a conductive face portion of the inner spring member during one portion of the movement of the inner spring member. Insulating matter insulates the contact element from the conductive face portion during another portion of the movement. Two electrical connectors outside the cavity are conductively connected to the contact element and the conductive face portion respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.