Arm for electric switches and the like controlled by electricity
US5023587A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 1990 |
| Grant date | Jun 11, 1991 |
| Priority date | — |
| Expiry date | Jun 6, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H61/02
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
An arm preferably for electric switches, the arm being controlled by electricity, and having a first fixed end the other end of which is movable perpendicular to the length direction of the arm. The arm comprises two parallel portions (47) separated by an air gap (17) or some other heat insulating material, and which are secured to each other at each end. At least one of the portions, being heated by electricity and, through longitudinal differential expansion with respect to the other portion, achieves said movement. The portions are so shaped that, adjacent the fixed end (at 45) with respect to the rest of the portions, they have a reduced bending resistance about an axis which is perpendicular to the length direction of the arm and with respect to said direction of movement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.