Single throw pump switch
US5998749A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1999 |
| Grant date | Dec 7, 1999 |
| Priority date | — |
| Expiry date | Feb 11, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01H35/18
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A single pole, snap action, sump pump switch is disclosed having a housing containing a single electrically conductive contact arm with a contact mounted on a forward end portion, which arm is pivotally movable between on and off positions. The contact arm contains a pair of pivot tabs projecting from opposite sides on a rear end portion thereof, which pivot tabs fit within rearwardly opening, triangularly shaped notches on a U-shaped terminal. The notches form a fulcrum about which the contact arm rocks through the U-shaped member when switching between the on and off positions. An actuator arm is pivotally mounted between a pair of shoulders formed on opposing sidewalls within the housing and projects out of a rear end of the housing for connection to a float bulb assembly. A forward end of the actuator arm fits within a recess in one end of a pivot bushing. The other end of the bushing is open to receive one end of a coiled spring therein, the other end being compressed against a rear edge of the contact arm surrounding a centering tab. The actuator arm, bushing and spring combination, directly actuates the contact arm near the fulcrum, thus, providing a relatively long lever ar…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.