Bimetal-controlled overload protection switch
US4347494A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 13, 1981 |
| Grant date | Aug 31, 1982 |
| Priority date | — |
| Expiry date | Oct 13, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2071/088
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
In an overload protection switch including a narrow housing, bimetal strips mounted in the housing, a pushbutton mounted in, and projecting out of, the housing and made of insulating material, the pushbutton being provided with a partition and being movable relative to the housing between an on position in which a conductive path is established via the strips and an off position in which such conductive path is broken, and a spring device urging the pushbutton into its off position, the housing and bimetal strips are physically symmetrical to the longitudinal center axis of the housing, the path of movement of the pushbutton is along that center axis, there are two identical bimetal strips disposed symmetrically relative to the center axis, each strip having a first part fastened to the housing and a second part which is movable relative to the housing in response to temperature changes, with the second parts converging toward one another while remaining out of contact, the pushbutton carries a conductive contact piece at a location such that in the on position of the pushbutton the contact piece is wedged between the strips and is held thereagainst by the force of the spring devic…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.