Engine shut-off circuit
US4995357A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 1989 |
| Grant date | Feb 26, 1991 |
| Priority date | — |
| Expiry date | Nov 13, 2009 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02B61/00
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
An ignition-powered engine shut-off circuit is provided for power-driven apparatus such as lawn mowers, pumps, generators, tractors and the like. The shut-off circuit preferably includes a first switch, such as a low oil or toggle switch, which is activated when a particular condition exists. The circuit also includes an electronic switch that is subject to the control of a switch control means. When the first switch senses that a particular condition exists, the switch control means gates on the electronic switch, grounding the ignition pulses and shutting off the engine. The first switch is preferably a reed switch used to sense low oil levels, and the electronic switch is preferably a high-power SCR or other thyristor. An indicator means consisting of an LED and a shunt resistor indicates that the ignition pulses are being grounded.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.