Inversion spring for thermal overload relay and method for making the same
US5054754A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 14, 1989 |
| Grant date | Oct 8, 1991 |
| Priority date | — |
| Expiry date | Sep 14, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49609
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An inversion spring unit for a thermal overload relay and method for making the same, comprising a support member, a spring plate having a first end, a second end, an elongated central axis, and first and second side portions disposed on opposite sides of the central axis, the side protions being bent towards each other at the first end and attached at the first end to the support member for causing the second end of the spring plate to curve in a first direction away from the central axis, and a lug disposed intermediate the first and second ends for selective engagement with a drive portion to cause the second end of the spring plate to curve in a second direction opposite the first direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.