Low oil pressure interlock switch
US4986228A · kind A · utility
8Cited by
23References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1989 |
| Grant date | Jan 22, 1991 |
| Priority date | — |
| Expiry date | Nov 1, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF01M11/12
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An ignition-powered interlock switch is provided for disabling a low oil pressure switch in power-driven apparatus such as lawn mowers, pumps, generators, tractors and the like. The interlock switch disables the low oil pressure switch when the engine is not running to permit the engine to be easily started. The interlock switch preferably comprises a diode, a relay, and a capacitor connected in parallel with the relay solenoid. The capacitor discharges through the relay solenoid after the engine stops running to operate the relay. The interlock switch may also include either a manual or an electronic switch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.