Speed responsive switching device
US4054764A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 17, 1976 |
| Grant date | Oct 18, 1977 |
| Priority date | — |
| Expiry date | May 17, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H3/56
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An overspeed switching mechanism for a motor has an electrically conductive rotor driven by the motor, a movable drag mechanism having a permanent magnet structure linked magnetically with the rotor for movement of the mechanism through electromagnetic interaction between the magnet structure and the rotor, a latching mechanism linked with the drag mechanism by means of another permanent magnet structure for restraining movement of the drag mechanism until the rotor attains a preset speed at which the latching mechanism releases the drag mechanism and allows limited movement thereof, a switch, and an actuator operatively linked with the drag mechanism and the switch for translating movement of the drag mechanism into switching of the switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.