Interlock circuit for de-activating an engine
US5190019A · kind A · utility
19Cited by
6References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 10, 1991 |
| Grant date | Mar 2, 1993 |
| Priority date | — |
| Expiry date | Sep 10, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF02P11/06
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A safety circuit coupled to an ignition circuit and a magneto coil for disabling an engine that powers a riding lawn mower. The circuit includes a triac which is rendered conductive in response to a sensed unsafe condition. The triac turns on to short the magneto coil and prevent generation of a spark plug energization voltage. A capacitor coupled to the triac gate electrode charges in the event an unsafe condition is sensed and is prevented from charging when operating conditions are safe.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.