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Service brake and shift lever interlock system

  • US 5,018,610 A
  • Filed: 02/23/1989
  • Issued: 05/28/1991
  • Est. Priority Date: 02/23/1989
  • Status: Expired due to Fees
First Claim
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1. An interlock system for a vehicle having a transmission, an engine and a service brake system operable in a brake applied mode and a brake release mode, comprising:

  • (a) shift lever means movable between a non-drive position and a drive position,(b) detent means for releasably retaining the shift lever means in a selected position,(c) an ignition switch mechanism having a "Lock" position, a "Start" position to start the engine and a "Run" position to operate the engine,(d) a locking lever operably connected to the ignition switch mechanism,(e) means for moving said locking lever to a locking position when the shift lever is releasably retained in said non-drive position such that said locking lever in said locking position prevents actuation of the detent means to release the shift lever when the ignition switch mechanism is in the "Lock" position, and(f) lever locking means responsive to the mode of the service brake system for retaining the locking lever in said locking position when the shift lever is in the non-drive position with the ignition switch mechanism in the "Start" position or "Run" position and with the service brake system in the brake release mode and for releasing the locking lever for movement from said locking position when the shift lever is in the non-drive position with the ignition switch mechanism in the "Start" position or the "Run" position and with the service brake system in the brake applied mode such that said shift lever can be moved to the drive position, said lever locking means comprising a solenoid having a plunger, said solenoid being operative in response to said service brake system being in said brake release mode when the shift lever is in the non-drive position and the ignition switch mechanism is in the "Start" position or "Run" position to position its plunger in an aligned aperture in the locking lever at said locking position to retain the locking lever in said locking position and said solenoid being operative in response to said service brake system being in the brake applied mode when the shift lever is in the non-drive position and the ignition switch mechanism is in the "Start" position or "Run" position to remove its plunger from the aperture to release the locking lever.

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