Deadman's switch
US4192982A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 2, 1978 |
| Grant date | Mar 11, 1980 |
| Priority date | — |
| Expiry date | Aug 2, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2300/026
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch includes an actuating element movable against a biasing force from a rest into a working position. The element is engageable with a member movable under a force of a predetermined magnitude applied thereto between a first position corresponding to the rest position of the element and a second position in which it displaces the element into the working position. The member is provided with a spring for urging the member against the applied force into the first position so as to release the actuating element. The member tends to prematurely move into the first position in response to a slight decrease of the applied force to a lever below the predetermined magnitude. The switch is further provided with an arrangement for preventing the premature movement of the member into the first position until after the applied force decreases below the above-mentioned level.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.