Motor protector
US3959691A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 16, 1973 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | Apr 16, 1993 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H2061/0122
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The disclosure relates to a manual reset motor protector device having an arm of a nickel-titanium metal alloy or the like supporting an electrical contact and having a spring arm supporting a second electrical contact, both of these arms being mounted on a device housing. A manual reset member is slidable on the housing for deforming the arm of the noted nickel-titanium metal alloy from an original configuration to a second configuration while the nickel-titanium alloy is below a predetermined transition temperature, whereby the device contacts are normally engaged to close a device circuit. When the device is mounted on a motor for protecting the motor against over-temperature conditions, electrical current is normally directed through the device circuit. However, when an over-temperature condition occurs in the device so that the initially deformed arm of the nickel-titanium alloy is heated above its transition temperature, the arm returns abruptly to its original configuration and moves away from the spring arm to open the device circuit. The reset member has portions arranged to engage the nickel-titanium alloy arm and the spring arm of the device separately as the reset membe…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.