Oil pressure interlock switch powered by the engine starter
US4984543A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1989 |
| Grant date | Jan 15, 1991 |
| Priority date | — |
| Expiry date | Nov 1, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P11/02
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A starter-powered interlock switch means 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 means disables the low oil pressure switch when the engine is not running to permit the engine to be easily started. Several embodiments of the interlock switch means are disclosed. The embodiments include a capacitor that is charged by the starter motor during cranking of the engine, and a relay switch that interrupts the circuit between the ignition primary and the low oil pressure switch to disable the low oil pressure switch. When the engine has started, the capacitor discharges to control one or more other switches that in turn close the circuit between the ignition primary and the low oil pressure switch. The closing of the latter circuit enables the low oil pressure switch to be activated when a low oil pressure condition is sensed.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.