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Service brake and shift lever interlock system

  • US 5,129,494 A
  • Filed: 10/02/1990
  • Issued: 07/14/1992
  • Est. Priority Date: 02/23/1989
  • Status: Expired due to Fees
First Claim
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1. In a vehicle having a transmission with a shift lever movable between a drive position and a non-drive position, an engine and a service brake system operable in a brake applied mode and a brake release mode, a service brake and shift lever interlock system, comprising:

  • (a) an electrical power supply means,(b) electrically actuated locking means for preventing shifting of the shift lever from the non-drive position,(c) a logic control circuit connected in series between the electrical power supply means and the locking means for controlling actuation of said locking means, said circuit including;

    (1) ignition switch means that is in a closed, current conducting condition when the engine is operated or being started,(2) first switching means responsive to the position of the shift lever, said first switching means being placed in a current conducting condition when the shift lever is in the non-drive position and in a current non-conducting condition when the shift lever is in the drive position,(3) second switching means responsive to the mode of the service brake system, said second switching means being placed in a current conducting condition when the system is in the brake release mode and in a current non-conducting condition when the system is in the brake applied mode,whereby said logic control circuit electrically actuates said locking means to prevent shifting of the shift lever from the non-drive position when said ignition switch means is in the closed current-conducting condition and the service brake system is in the brake release mode.

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