Anti-rollaway device for trucks and equipment with fluid and electrically actuated brakes
First Claim
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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.
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Abstract
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.
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Citations
30 Claims
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1. A vehicle anti-rollaway device comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 23, 27)
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10. A vehicle anti-rollaway device comprising:
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a parking control valve connected between a source of pressurized fluid and a fluid controlled parking brake of a vehicle, said parking control valve operative for controlling a supply of pressurized fluid from the source of pressurized fluid to the fluid controlled parking brake of the vehicle; a speed sensor operative for outputting a speed signal corresponding to a speed of the vehicle; a speed control responsive to the speed signal for outputting a signal as a function of the speed sensor indicating the vehicle is at or below a predetermined speed; a solenoid valve fluidly connected in series between the source of pressurized fluid and the parking control valve whereupon pressurized fluid received by the parking control valve from the source of pressurized fluid for passage to the fluid controlled parking brake of the vehicle first passes through said solenoid valve, said solenoid valve responsive to the signal output by the speed control for terminating the supply of all pressurized fluid to the parking control valve; a first switch operative for controlling the response of the solenoid valve to the signal output by the speed control as a function of the supply of pressurized fluid to the fluid controlled parking brake of the vehicle; and a second switch operative for controlling the response of the solenoid valve to the signal output by the speed control as a function of the presence of an operator at least at one predetermined location in the vehicle. - View Dependent Claims (11, 12, 13, 24, 28)
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14. A vehicle anti-rollaway device for use on a vehicle equipped with a parking control valve operative for controlling the supply of pressurized fluid to a fluid controlled parking brake of the vehicle and a speed control operative for outputting a signal when the speed of the vehicle is at or below a predetermined speed, said device comprising:
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a solenoid valve fluidly connected in series between a source of pressured fluid and the parking control valve, said solenoid valve responsive to the signal output by the speed control for controlling the supply of all pressurized fluid to the parking control valve; and a first switch operative for controlling the response of the solenoid valve to the signal output by the speed control as a function of the presence and absence of an operator at a predetermined location in the vehicle, wherein, in response to the operator moving from the predetermined location in the vehicle when pressurized fluid is being supplied to the fluid controlled parking brake of the vehicle via the solenoid valve and the parking control valve, the first switch changes state whereupon the solenoid valve terminates the supply of all pressurized fluid to the parking control valve whereupon the fluid controlled parking brake assumes its on state. - View Dependent Claims (15, 16, 17, 18, 25, 29)
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19. A vehicle anti-rollaway device comprising:
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a solenoid valve operatively coupled between a source of pressurized fluid and a parking control valve that controls the state of a fluid actuated parking brake of the vehicle; and a first switch responsive to the presence and absence of an operator at a predetermined location in the vehicle for controlling the state of the solenoid valve to respectively supply and withhold all pressurized fluid to the parking control valve, wherein the first switch assumes open and closed states in response to the respective presence and absence of the driver at a predetermined location in the vehicle. - View Dependent Claims (20, 21, 22, 26, 30)
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Specification