Ratchet means switch operator
US4788520A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Sep 24, 1987 |
| Grant date | Nov 29, 1988 |
| Priority date | — |
| Expiry date | Sep 24, 2007 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H13/58
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A switch operator has a low friction ratchet wheel driven by a low power time programmed clock to operate the switch in one position or another depending upon the position of the ratchet wheel to operate the ratchet wheel independent of the time programmed clock. A pawl resiliently held and biased away from the ratchet wheel engages the ratchet wheel when moving in a forward direction to move it a predetermined amount. A cam member mounted adjacent the ratch wheel is engaged by the pawl to bias the pawl against a projection on the ratchet wheel when the pawl is moved forward and to bias the pawl away from the ratchet wheel upon its return movement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.