Enclosed switch contact assembly
US4927988A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 23, 1989 |
| Grant date | May 22, 1990 |
| Priority date | — |
| Expiry date | Jan 23, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A centrifugal switch assembly for a single phase induction motor connects a start winding in circuit to start the motor. A centrifugal actuator positions a movable contact on the end of a cantilevered spring arm relative to an aligned fixed switch carried by an insulating flat plate secured within the motor. A silicone rubber boot in the form of a tubular member has a first heavy end telescoped over the movable contact with a resilient gripping of the side of the contact. The opposite end of the boot is a heavy end which is freely telescoped over the opposite contact into engagement with the flat plate to totally enclose the contacts, but may also be attached to the contact with a resilient grip. The boot has an intermediate convolution between the two ends. The convolution is formed as a very thin wall to establish a highly flexible but supporting wall member. The boot length is greater than the spacing of the open contacts and the convolution is continuously deflected to create a compressive support of the boot between the flat plate and the movable contact. The contacts open to de-energize the circuit during the starting of the motor. The boot may have more than one convolution …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.