Interlock circuit for a walk-behind mower

Details Interlock circuit for a walk-behind mower Interlock circuit for a walk-behind mower

1996-01-31

1997-07-08

Rice, Kenneth R.

Motor vehicles

With means for promoting safety of vehicle, its occupant or...

Responsive to absence or inattention of operator, or...

180 531, B60K 2800

Patent

active

056451350

ABSTRACT:
An interlock circuit includes key and PTO switches, at least one operator presence switch, and relays connected to a transmission switch to prevent engine starting and running unless the PTO is off, the transmission is in neutral and the key is on. Operator presence switch activation is unnecessary to start the engine but is required before PTO or transmission condition is changed to begin a vehicle operation such as cutting grass. Required start and run features of the interlock circuitry are met using simple circuits with readily available components and without modules. The circuitry can be used with pull start and electric start vehicles and is particularly useful with vehicles that have transmission clutches that lock engaged when the operator releases a bail.

REFERENCES:
patent: 3266032 (1966-08-01), Buhler
patent: 3942604 (1976-03-01), Black, III
patent: 4580455 (1986-04-01), Beugelsdyk et al.
patent: 4651018 (1987-03-01), Peterson, Jr.
patent: 4974711 (1990-12-01), Peterson, Jr. et al.
patent: 5203440 (1993-04-01), Peterson, Jr. et al.
patent: 5314038 (1994-05-01), Peterson, Jr. et al.

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