Safety apparatus for vehicles having automatic transmissions
OwnerJerald L. Stugartinventor
Life of this patent
Estimating the term…
Abstract
A neutral safety switch is moved to a closed position upon shifting of an automatic transmission to a neutral position but moved to an open position when the automatic transmission is shifted to a drive position. An air pressure responsive switch is moved to a closed position when air brake pressure is reduced to set alternative brakes and is in series with a bell, buzzer, light or other signal producing device. A control device is controlled by the neutral safety switch, so as to close one circuit, whereby an ignition control may be utilized to start the engine with the transmission in neutral position, but to close an alternative circuit, whereby the signal device will be activated with the alternative brakes set, when the neutral safety switch is moved to open position.
Claims8
Safety apparatus for a truck or tractor having an engine, an automatic transmission, air brakes and alternative brakes which set when air brake pressure is reduced to a predetermined value, for producing a signal when such transmission is shifted away from neutral while the engine is running for an extended period of time and such alternative brakes are utilized for parking purposes, comprising:
- a neutral safety switch which is moved to a closed position upon shifting of the automatic transmission to a neutral position but moved to an open position when the automatic transmission is shifted to a drive position;
- an air pressure responsive switch which is moved to a closed position when air brake pressure is reduced to said predetermined value;
- means for producing a signal and connected in series with said air pressure responsive switch;
- current supply means;
- and
- means controlled by said neutral safety switch for causing current to be supplied to said air pressure switch and said signal producing means when said neutral safety switch is moved to an open position.
Dependencies are inferred from the claim text.