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Motor vehicle security system and security method

  • US 3,973,805 A
  • Filed: 02/14/1975
  • Issued: 08/10/1976
  • Est. Priority Date: 09/20/1971
  • Status: Expired due to Term
First Claim
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1. A motor vehicle security system comprising a vehicle braking system having separate braking assemblies for each of a plurality of wheels, each braking assembly including a pneumatically operated brake setting assembly and a mechanically powered alternate booster assembly brake setting means, each pneumatically operated brake setting assembly being normally arranged in a nonbraking position and adapted to be activated to braking position through the operation of the pneumatically operated brake setting assembly by the application of pressurized air under the control of the vehicle driver, the mechanically powered alternate booster assembly brake setting means being normally arranged in a non-braking position in response to the application of pressurized air and adapted to automatically set the vehicle brakes upon failure of said pressurized air, said mechanically powered alternate booster assembly brake setting means including access means into the interior of the booster assembly for manually resetting said booster assembly and first key means constructed and defined to lock the access means to the interior of said alternate booster assembly brake setting means to prevent the booster assembly from being manually operated at the brake setting means by an unauthorized individual, the brakes being maintained in a set condition when set by the booster assembly until the booster assembly is manually reset, and lockable control valve means including an individual key actuated lock means for the valve means having an unlocked position for manually controlling the application of pressurized air to said alternate booster assembly for conveying pressurized air through the valve means to the alternate booster assembly brake setting means to set the booster assembly to a non-braking position and to lock same in the set position when the lockable valve means is manually operated to the locked position to prevent the conveyance of the pressurized air to the alternate booster assembly through the valve means.

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