Positive break snap action switch
US4154996A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 12, 1977 |
| Grant date | May 15, 1979 |
| Priority date | — |
| Expiry date | May 12, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H1/2008
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch of the type utilized for machine tool controls and actuated by a roller passing over a cam track has two members mounted for independent reciprocation along a plunger actuated from the cam track. One of the members carries a movable contact or contacts, while the second member is utilized to trigger the first member. Each of the members is independently activated by an associated overcenter arrangement for snap action. A compression spring is utilized to return drive the plunger from the position to which it is moved by the action of the roller on the cam track. Movement of the plunger under the driving force of either the roller and cam track or the compression spring provides for a snap action of both members in the appropriate direction upon activation by their respective overcenter arrangement. The plunger is driven by the cam track to provide a positive contact break, while the compression spring provides an additional opening force in the other direction, if the overcenter arrangements for the two members do not succeed in effecting the desired contact opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.