Neutral start and park brake safety interlock circuitry for a tr

Details Neutral start and park brake safety interlock circuitry for a tr Neutral start and park brake safety interlock circuitry for a tr

1976-11-05

1977-10-04

Betts, Kenneth H.

Motor vehicles

Bodies

307 10R, 74473R, 123179K, B60K 2800

Patent

active

040519155

ABSTRACT:
Electric control circuitry is provided for preventing a tractor engine from being started with the tractor transmission or power take-off engaged and for preventing the tractor from being driven with the park brake engaged. The control circuitry includes normally open power take-off and transmission condition sensing switches connected in series with each other and a starting solenoid and thus defining a portion of a starting circuit. These two switches in the starting circuit are respectively held closed only when a power take-off control lever is in a clutch-disengage position and the transmission shift lever is in a neutral position. The control circuitry also includes a second normally open transmission condition sensing switch connected in parallel with a normally open park brake condition sensing switch, these two switches being in series with the ignition coil and thus defining a portion of an ignition circuit. Also, these two switches are respectively held closed only when the transmission shift lever is in its neutral position and a brake pedal locking pawl is in a pedal-release position.

REFERENCES:
patent: 2250754 (1941-07-01), Dooley
patent: 2740947 (1956-05-01), Davies
patent: 3185246 (1965-05-01), Maurer
patent: 3229452 (1966-01-01), Hasenbank
patent: 3715002 (1973-02-01), Halls et al.
patent: 3733794 (1973-05-01), Allen
patent: 3736729 (1973-06-01), Peterson
patent: 3782084 (1974-01-01), Harkness
patent: 3969875 (1976-07-01), Nofel

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