Anti-rollaway device for trucks and equipment with fluid and electrically actuated brakes

摘要

A vehicle anti-rollaway device includes a first switch responsive to the presence and absence of an operator at a predetermined location in the vehicle for controlling the on/off state of parking brake of the vehicle in the form of either a servo controlled parking brake or a fluid controlled parking brake. The device can also include a speed control responsive to a speed of the vehicle for controlling the on/off state of the parking brake as a function of the speed of the vehicle. The device can also include a second switch operative for controlling the response of the parking brake to the state of the first switch.

主权项

1. A vehicle anti-rollaway device comprising:
a source of electrical power; means responsive to providing and withholding electrical power from the source of electrical power for controlling the operation of a fluid controlled parking brake of the vehicle as a function thereof; and means responsive to the presence and absence of a vehicle operator at a predetermined location in the vehicle for controlling said providing and withholding of electrical power from the means for controlling the operation of the fluid controlled parking brake, wherein: the means for controlling the operation of the fluid controlled parking brake includes a solenoid valve fluidly connected in series in a path of pressurized fluid that runs between a source of pressurized fluid and the fluid controlled parking brake, and a parking control valve fluidly connected in series in the path of pressurized fluid between the solenoid valve and the fluid controlled parking brake; and said solenoid valve is responsive to the providing and withholding of electrical power for respectively withholding and providing all pressurized fluid to the parking control valve.