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Transmission locking system

  • US 3,960,235 A
  • Filed: 12/23/1974
  • Issued: 06/01/1976
  • Est. Priority Date: 12/24/1973
  • Status: Expired due to Term
First Claim
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1. A transmission locking system for a motor vehicle, comprising electric locking means movable between a rest position to allow a transmission of the vehicle to be shifted into a driving gear and a locking position to lock said transmission in a neutral position in which the vehicle is unable to start to move, first sensing means sensing that the driver sits down on his seat of the vehicle to produce a first output signal and sensing that the driver is absent from his seat to produce a second output signal, second sensing means sensing that the driver fails to carry out a precautionary procedure for his safety and protection when said first sensing means produces said first output signal to produce an output signal, and an electric control circuit connected to said first and second sensing means and to said electric locking means and responsive to said output signal of said second sensing means to produce an output signal to move said electric locking means said rest position into said locking position, in which said electric control circuit comprises a first bistable memory circuit which is set by said second output signal of said first sensing means to produce an output signal and which is reset by said output signal of said second sensing means to cease to produce said output signal, a first AND gate circuit for producing an output signal only when said first output signal of said first sensing means and said output signal of said bistable memory circuit are concurrently present, and an OR gate circuit for producing an output signal when only one of said output signal of said second sensing means and said output signal of said AND gate circuit is present, said electrical locking means being moved from said rest position into said locking position to lock said transmission in said neutral position when said output signal of said OR gate circuit is present.

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