Vehicle speed control device

Claim 2

A speed control device for a railroad car to control the speed of the car within predetermined limits comprising: a wheel driven governor, speed control valve means to supply fluid under pressure to an associated car brake cylinder for operating the associated car wheel brakes and operatively associated with said governor and opened thereby upon exceeding a predetermined maximum speed for supplying the fluid under pressure to the brake cylinder, conditioning means operatively connected with said speed control valve means and the governor and selectively controlling the operation of said valve means in accordance with the speed of the car, off-car mounted tripping mechanism being operatively associated with said conditioning means to operate same and To set the conditioning means to cause a supply of pressurized fluid to said speed control valve means when required, said governor comprising a speed responsive unit operable in accordance with the predetermined maximum speed of the car to cause operation of the valve means, and mounting means pivotally mounting the speed responsive unit on the car for movement of the speed responsive unit between operative and inoperative positions.

Claim 3

The invention according to claim 1, and said device including a wheel driven generator connecting with the speed responsive unit and the valve means and operative upon the latter when a predetermined speed is exceeded to brake the car.

Claim 4

The invention according to claim 1, and movable means for moving said mounting means between operative and inoperative positions.

Claim 5

The invention according to claim 3, and said movable means including a fluid operated ram means which, upon extension and contraction in response to the fluid under pressure, moves said mounting means and said speed responsive unit thereby between said operative and inoperative positions.

Claim 6

The invention according to claim 4, and means having a source of pressure introduced to said fluid operated ram means for moving the speed responsive unit to the inoperative position.

Claim 7

The invention according to claim 1, and said speed responsive unit comprising a centrifugal speed responsive switch.

Claim 8

The invention according to claim 1, and said speed responsive unit comprising a centrifugal speed responsive switch, generator means being operated by the movement of said car and operative to supply a source of electrical energy to said speed control valve means when said centrifugal speed responsive switch closes the circuit between the speed responsive control valve means and the generator.

Claim 9

A speed control device for a railroad car to control the speed of the car within predetermined limits comprising: a wheel driven means and a governor driven by said wheel means, speed control valve means to supply fluid under pressure to an associated car brake cylinder for operating the associated car wheel brakes and operatively associated with said governor and opened thereby upon exceeding a predetermined maximum speed for supplying the fluid under pressure to the brake cylinder, conditioning means operatively connected with said speed control valve means and the governor and selectively controlling the operation of said valve means in accordance with the speed of the car, off-car mounted tripping mechanism being operatively associated with said conditioning means to operate same and to set the conditioning means to cause a supply of pressurized fluid to said speed control valve means when required, and pneumatic means including a first reservoir, a second reservoir, passage means supplying fluid to each reservoir, conduit means connecting with each of the reservoirs for supplying braking fluid to the brake cylinder, said conduit means including a first conduit connecting with the speed control valve and with the first reservoir and a second conduit connecting with the second reservoir, two-way valve means adapted for connecting with the associated brake cylinder and connecting with each of the conduits, and means in said two-way valve means for selectively and alternately supplying communication between one of the conduits and the brake cylinder, said governor upon operating of said speed control valve means allowing communication of the first conduit with the brake cylinder and preventing communication of the second conduit with the brake cylinder.

Claim 10

A speed control device for a railroad car to control the speed of the car within predetermined limits comprising: a wheel driven means and a governor driven by said wheel means, speed control valve means to supply fluid under pressure to an associated car brake cylinder for operating the associated car wheel brakes and operatively associated with said governor and opened thereby upon exceeding a predetermined maximum speed for supplying the fluid under pressure to the brake cylinder, conditioning means operatively connected with said speed control valve means and the governor and selectively controlling the operation of said valve means in accordance with the speed of the car, off-car mounted tripping mechanism being operatively associated with said conditioning means to operate same and to set the conditioning means to cause a supply of pressurized fluid to said speed control valve means when required, and pneumatic means including a first reservoir, a second reservoir, passage means supplying fluid to each reservoir, conduit means connecting with each of the reservoirs for supplying braking fluid to the brake cylinder, said conduit means including a first conduit connecting with the speed control valve and with the first reservoir and a second conduit connecting with the second reservoir, two-way valve means adapted for connecting with the associated brake cylinder and connecting with each of the conduits, and means in said two-way valve means for selectively and alternately supplying communication between one of the conduits and the brake cylinder, said governor upon operating of said speed control valve means allowing communication of the first conduit with the brake cylinder and preventing communication of the second conduit with the brake cylinder.

Claim 11

The invention according to claim 8, and said two-way valve means having a port communication with the first conduit and having a port communication with the second conduit and having a port communication with the brake cylinder and passage blocking means reciprocally disposed in said two-way valve and movable in response to pressure in either the first or second conduit for moving the passage blocking means to the other position for communication of the other conduit with the brake cylinder.

Claim 12

The invention according to claim 8, and a quick exhaust valve being disposed between the speed control valve means and the two-way valve means and bleed hole means operatively associated with and operative upon the first conduit for dropping the pressure therein and exhausting fluid under pressure from the associated brake cylinder and out the quick exhaust valve means.

Claim 13

The invention according to claim 10, and said quick exhaust valve means including a resiliently loaded diaphragm operable to exhaust the fluid from the brake chamber upon a drop in pressure in the first conduit.

Claim 14

A speed control device for a railroad car to control the speed of the car within predetermined limits comprising: a wheel driven governor, speed control valve means to supply fluid under pressure to an associated car brake cylinder for operating associated car wheel brakes and operatively associated with said governor and opened thereby upon exceeding a predetermined maximum speed for supplying the fluid under pressure to the brake cylinder, conditioning means operatively connected with said speed control valve means and the governor and selectively controlling the operation of said valve means in accordance with the speed of the car, off-car mounted tripping mechanism being operatively associated with said conditioning means to operate same and to set the conditioning means to cause a supply of pressurized fluid to said speed control valve means when the predetermined speed is exceeded, said speed control valve means including an electrical solenoid valve and said governor including a centrifugal speed responsive switch and an electrical generator for supplying current, the generator and switch being drivingly operated by engagement with the railroad wheel whereby an electrical current is supplied to the solenoid valve for energizing the same upon closing of the switch when the vehicle reaches a predetermined speed, said switch including a first fixed contact portion and a second movable switch portion movable toward the first fixed portion upon increase in car speed, and means for movably adjusting the fixed contact portion with respect to the movable portion for variably adjusting the maximum car speed required to energize the solenoid valve.

Claim 15

A speed control device for a railroad car to control the speed of the car within predetermined limits comprising: a wheel driven governor, speed control valve means to supply fluid under pressure to an associated car brake cylinder for operating associated car wheel brakes and operatively associated with said governor and opened thereby upon exceeding a predetermined maximum speed for supplying the fluid under pressure to the brake cylinder, conditioning means operatively connected with said speed control valve means and the governor and selectively controlling the operation of said valve means in accordance with the speed of the car, off-car mounted tripping mechanism being operatively associated with said conditioning means to operate same and to set the conditioning means to cause a supply of pressurized fluid to said speed control valve means when the predetermined speed is exceeded, said speed control valve means including an electrical solenoid valve and said governor including a centrifugal speed responsive switch and an electrical generator for supplying current, the generator and switch being drivingly operated by engagement with the railroad wheel whereby an electrical current is supplied to the solenoid valve for energizing the same upon closing of the switch when the vehicle reaches a predetermined speed, said switch including a first fixed contact portion and a second movable switch portion movable toward the first fixed portion upon increase in car speed, and means for movably adjusting the fixed contact portion with respect to the movable portion for variably adjusting the maximum car speed required to energize the solenoid valve.

Claim 16

The invention according to claim 12, and said variable adjustable means providing a setscrew means for movement of the fixed contact portion toward and away from the movable switch portion.

Claim 17

A speed control device for a railroad car to control the speed of the car within predetermined limits comprising: a wheel driven governor including a speed responsive means, speed control valve means to supply fluid under pressure to an associated car brake cylinder for operating associated car wheel brakes and operatively associated with said governor and opened thereby upon exceeding a predetermined maximum speed for supplying the fluid under pressure to the brake cylinder, conditioning means operatively connected with said speed control valve means and the governor and selectively controlling the operation of said valve means in accordance with the speed of the car, off-car mounted tripping mechanism being operatively associated with said conditioning means to operate same and to set the conditioning means to cause a supply of pressurized fluid to said speed control valve means when required, a wheel driven generator, and mounting means carrying said speed responsive means and said generator and being pivotal between an engaged position for operation of the speed control device in a speed control position and in a position where said speed control device is inoperative.

Claim 18

A speed control device for a railroad car to control the speed of the car within predetermined limits comprising: a wheel driven governor including a speed responsive means, speed control valve means to supply fluid under pressure to an associated car brake cylinder for operating associated car wheel brakes and operatively associated with said governor and opened thereby upon exceeding a predetermined maximum speed for supplying the fluid under pressure to the brake cylinder, conditioning means operatively connected with said speed control valve means and the governor and selectively controlling the operation of said valve means in accordance with the speed of the car, off-car mounted tripping mechanism being operatively associated with said conditioning means to operate same and to set the conditioning means to cause a supply of pressurized fluid to said speed control valve means when required, a wheel driven generator, and mounting means carrying said speed responsive means and said generator and being pivotal between an engaged position for operation of the speed control device in a speed control position and in a position where said speed control device is inoperative.

Claim 19

The invention according to claim 14, and movable means connecting with the mounting means and moving same for pivoting said generator and said speed responsive means between operative aNd inoperative positions of the speed control device.

Claim 20

A speed control device for a vehicle comprising: an electric circuit, an electric generator in said circuit and for mounting on the car and operatively connectable with the vehicle wheel and drivable thereby, a speed responsive switch in said circuit and operatively connectable with said wheel and drivable thereby to complete the electric circuit to the generator in going from an open position to a closed position when the vehicle exceeds a predetermined speed, an off-vehicle trigger responsive switch element in said circuit having opened and closed circuit positions and mountable on said vehicle and connecting with the generator, a holding relay in said circuit being in series connection with said switch element and said generator whereby when said switch element is in the closed position said holding relay is energized, said holding relay being mountable on said vehicle, a solenoid actuated air valve for supplying and terminating the supply of air pressure to the associated vehicle brakes being in said circuit and having a series connected with said relay and said speed responsive switch and with said generator when said holding relay is energized, said solenoid valve being mountable on said vehicle, said speed responsive switch, in going from the open to the closed position upon the vehicle''s exceeding a predetermined speed, causes the solenoid valve to be placed in a closed circuit series connection with the generator with the holding relay being energized whereby the solenoid valve is moved for supplying air pressure to brake the vehicle, whereupon when the vehicle speed falls below the predetermined speed the speed responsive switch opens the circuit and the solenoid valve closes off the air supply to the vehicle brakes, and mounting means carrying said speed responsive switch and said generator and being pivotal between an engaged position for operation of the speed control device in a speed control position and in a position where said speed control device is inoperative.

Claim 21

A speed control device for a vehicle comprising: an electric circuit, an electric generator in said circuit and for mounting on the car and operatively connectable with the vehicle wheel and drivable thereby, a speed responsive switch in said circuit and operatively connectable with said wheel and drivable thereby to complete the electric circuit to the generator in going from an open position to a closed position when the vehicle exceeds a predetermined speed, an off-vehicle trigger responsive switch element in said circuit having opened and closed circuit positions and mountable on said vehicle and connecting with the generator, a holding relay in said circuit being in series connection with said switch element and said generator whereby when said switch element is in the closed position said holding relay is energized, said holding relay being mountable on said vehicle, a solenoid actuated air valve for supplying and terminating the supply of air pressure to the associated vehicle brakes being in said circuit and having a series connected with said relay and said speed responsive switch and with said generator when said holding relay is energized, said solenoid valve being mountable on said vehicle, said speed responsive switch, in going from the open to the closed position upon the vehicle''s exceeding a predetermined speed, causes the solenoid valve to be placed in a closed circuit series connection with the generator with the holding relay being energized whereby the solenoid valve is moved for supplying air pressure to brake the vehicle, whereupon when the vehicle speed falls below the predetermined speed the speed responsive switch opens the circuit and the solenoid valve closes off the air supply to the vehicle brakes, and mounting means carrying said speed responsive switch and said generator and being pivotal between an engaged position for operation of the speed control device in a speed control position and in a position where said speed control device is inoperative.

Claim 22

A speed control device for a vehicle comprising: an electric circuit, an electric generator in said circuit and for mounting on the vehicle and operatively connectable with the vehicle wheel and drivable thereby, a speed responsive switch in said circuit and operatively connectable with said wheel and drivable thereby to complete the electric circuit to the generator in going from an open position to a closed position when the vehicle exceeds a predetermined speed, an off-vehicle trigger responsive switch element in said circuit having opened and closed circuit positions and mountable on said vehicle and connecting with the generator, a holding relay in said circuit being in series connection with said switch element and said generator whereby when said switch element is in the closed position said holding relay is energized, said holding relay being mountable on said vehicle, a solenoid actuated air valve for supplying and terminating the supply of air pressure to the associated vehicle brakes being in said circuit and having a series connected with said relay and said speed responsive switch and with said generator when said holding relay is energized, said solenoid valve being mountable on said vehicle, said speed responsive switch, in going from the open to the closed position upon the vehicle''s exceeding a predetermined speed, causes the solenoid valve to be placed in a closed circuit series connection with the generator with the holding relay being energized whereby the solenoid valve is moved for supplying air pressure to brake the vehicle, whereupon when the vehicle speed falls below the predetermined speed the speed responsive switch opens the circuit and the solenoid valve closes off the air supply to the vehicle brake means, and pneumatic means including a first reservoir, a second reservoir, passage means supplying fluid to each reServoir, conduit means connecting with each of the reservoirs for supplying braking fluid to the brake cylinder, said conduit means including a first conduit connecting with the speed control valve and with the first reservoir and a second conduit connecting with the second reservoir, two-way valve means adapted for connecting with the associated brake cylinder and connecting with each of the conduits, and means in said two-way valve means for selectively and alternately supplying communication between one of the conduits and the brake cylinder, said solenoid valve allowing communication of the first conduit with the brake cylinder and preventing communication of the second conduit with the brake cylinder when the vehicle exceeds the predetermined speed.

Claim 23

A speed control device for a vehicle comprising: an electric circuit, an electric generator in said circuit and for mounting on the vehicle and operatively connectable with the vehicle wheel and drivable thereby, a speed responsive switch in said circuit and operatively connectable with said wheel and drivable thereby to complete the electric circuit to the generator in going from an open position to a closed position when the vehicle exceeds a predetermined speed, an off-vehicle trigger responsive switch element in said circuit having opened and closed circuit positions and mountable on said vehicle and connecting with the generator, a holding relay in said circuit being in series connection with said switch element and said generator whereby when said switch element is in the closed position said holding relay is energized, said holding relay being mountable on said vehicle, a solenoid actuated air valve for supplying and terminating the supply of air pressure to the associated vehicle brakes being in said circuit and having a series connected with said relay and said speed responsive switch and with said generator when said holding relay is energized, said solenoid valve being mountable on said vehicle, said speed responsive switch, in going from the open to the closed position upon the vehicle''s exceeding a predetermined speed, causes the solenoid valve to be placed in a closed circuit series connection with the generator with the holding relay being energized whereby the solenoid valve is moved for supplying air pressure to brake the vehicle, whereupon when the vehicle speed falls below the predetermined speed the speed responsive switch opens the circuit and the solenoid valve closes off the air supply to the vehicle brake means, and pneumatic means including a first reservoir, a second reservoir, passage means supplying fluid to each reServoir, conduit means connecting with each of the reservoirs for supplying braking fluid to the brake cylinder, said conduit means including a first conduit connecting with the speed control valve and with the first reservoir and a second conduit connecting with the second reservoir, two-way valve means adapted for connecting with the associated brake cylinder and connecting with each of the conduits, and means in said two-way valve means for selectively and alternately supplying communication between one of the conduits and the brake cylinder, said solenoid valve allowing communication of the first conduit with the brake cylinder and preventing communication of the second conduit with the brake cylinder when the vehicle exceeds the predetermined speed.

Claim 24

A speed control device for a vehicle comprising: an electric circuit, an electric generator in said circuit and for mounting on the vehicle and operatively connectable with the vehicle wheel and drivable thereby, a speed responsive switch in said circuit and operatively connectable with said wheel and drivable thereby to complete the electric circuit to the generator in going from an open position to a closed position when the vehicle exceeds a predetermined speed, an off-vehicle trigger responsive switch element in said circuit having opened and closed circuit positions and mountable on said vehicle and connecting with the generator, a holding relay in said circuit being in series connection with said switch element and said generator whereby when said switch element is in the closed position said holding relay is energized, said holding relay being mountable on said vehicle, a solenoid actuated air valve for supplying and terminating the supply of air pressure to the associated vehicle brakes being in said circuit and having a series connected with said relay and said speed responsive switch and with said generator when said holding relay is energized, said solenoid valve being mountable on said vehicle, said speed responsive switch, in going from the open to the closed position upon the vehicle''s exceeding a predetermined speed, causes the solenoid valve to be placed in a closed circuit series connection with the generator with the holding relay being energized whereby the solenoid valve is moved for supplying air pressure to brake the vehicle, whereupon when the vehicle speed falls below the predetermined speed the speed responsive switch opens the circuit and the solenoid valve closes off the air supply to the vehicle brakes, said switch including a first fixed contact portion and a second movable switch portion movable toward the first fixed portion upon increase in vehicle speed, and means for movably adjusting the fixed contact portion with respect to the movable portion for variably adjusting the maximum vehicle speed required to energize the solenoid valve.

Claim 25

A speed control device for a vehicle comprising: an electric circuit, an electric generator in said circuit and for mounting on the vehicle and operatively connectable with the vehicle wheel and drivable thereby, a speed responsive switch in said circuit and operatively connectable with said wheel and drivable thereby to complete the electric circuit to the generator in going from an open position to a closed position when the vehicle exceeds a predetermined speed, an off-vehicle trigger responsive switch element in said circuit having opened and closed circuit positions and mountable on said vehicle and connecting with the generator, a holding relay in said circuit being in series connection with said switch element and said generator whereby when said switch element is in the closed position said holding relay is energized, said holding relay being mountable on said vehicle, a solenoid actuated air valve for supplying and terminating the supply of air pressure to the associated vehicle brakes being in said circuit and having a series connected with said relay and said speed responsive switch and with said generator when said holding relay is energized, said solenoid valve being mountable on said vehicle, said speed responsive switch, in going from the open to the closed position upon the vehicle''s exceeding a predetermined speed, causes the solenoid valve to be placed in a closed circuit series connection with the generator with the holding relay being energized whereby the solenoid valve is moved for supplying air pressure to brake the vehicle, whereupon when the vehicle speed falls below the predetermined speed the speed responsive switch opens the circuit and the solenoid valve closes off the air supply to the vehicle brakes, said switch including a first fixed contact portion and a second movable switch portion movable toward the first fixed portion upon increase in vehicle speed, and means for movably adjusting the fixed contact portion with respect to the movable portion for variably adjusting the maximum vehicle speed required to energize the solenoid valve.

Claim 26

A speed control device for a vehicle comprising: an electric circuit, an electric generator in said circuit and for mounting on the vehicle and operatively connectable with the vehicle wheel and drivable thereby, a speed responsive switch in said circuit and operatively connectable with said wheel and drivable thereby to complete the electric circuit to the generator in going from an open position to a closed position when the vehicle exceeds a predetermined speed, an off-vehicle trigger responsive switch element in said circuit having opened and closed circuit positions and mountable on said vehicle and connecting with the generator, a holding relay in said circuit being in series connection with said switch element and said generator whereby when said switch element is in the closed position said holding relay is energized, said holding relay being mountable on said vehicle, a solenoid actuated air valve for supplying and terminating the supply of air pressure to the associated vehicle brakes being in said circuit and having a series connected with said relay and said spEed responsive switch and with said generator when said holding relay is energized, said solenoid valve being mountable on said vehicle, said speed responsive switch, in going from the open to the closed position upon the vehicle''s exceeding a predetermined speed, causes the solenoid valve to be placed in a closed circuit series connection with the generator with the holding relay being energized whereby the solenoid valve is moved for supplying air pressure to brake the vehicle, whereupon the vehicle speed falls below the predetermined speed the speed responsive switch opens the circuit and the solenoid valve closes off the air supply to the vehicle brakes, and mounting means for said speed responsive switch for attaching the speed responsive means to the vehicle, said mounting means being pivotal between an engaged position for operation of the speed control device in a speed control position and having a position where said speed control device is ineffective.

Claim 27

A speed control device for a vehicle comprising: an electric circuit, an electric generator in said circuit and for mounting on the vehicle and operatively connectable with the vehicle wheel and drivable thereby, a speed responsive switch in said circuit and operatively connectable with said wheel and drivable thereby to complete the electric circuit to the generator in going from an open position to a closed position when the vehicle exceeds a predetermined speed, an off-vehicle trigger responsive switch element in said circuit having opened and closed circuit positions and mountable on said vehicle and connecting with the generator, a holding relay in said circuit being in series connection with said switch element and said generator whereby when said switch element is in the closed position said holding relay is energized, said holding relay being mountable on said vehicle, a solenoid actuated air valve for supplying and terminating the supply of air pressure to the associated vehicle brakes being in said circuit and having a series connected with said relay and said spEed responsive switch and with said generator when said holding relay is energized, said solenoid valve being mountable on said vehicle, said speed responsive switch, in going from the open to the closed position upon the vehicle''s exceeding a predetermined speed, causes the solenoid valve to be placed in a closed circuit series connection with the generator with the holding relay being energized whereby the solenoid valve is moved for supplying air pressure to brake the vehicle, whereupon the vehicle speed falls below the predetermined speed the speed responsive switch opens the circuit and the solenoid valve closes off the air supply to the vehicle brakes, and mounting means for said speed responsive switch for attaching the speed responsive means to the vehicle, said mounting means being pivotal between an engaged position for operation of the speed control device in a speed control position and having a position where said speed control device is ineffective.

Claim 28

The invention according to claim 19, and means for pivotally moving said mounting means between operative and inoperative positions.

Claim 29

The invention according to claim 20, and said means for moving including a pneumatically operated ram and cylinder jack means.

Claim 30

In a railroad vehicle having a frame structure and having ground engaging means, a vehicle speed control device comprising: a ground driven generator provided with shaft means driven by the rotation of said ground engaging means, vehicle mounted solenoid operated fluid supply valve, centrifugal speed responsive means operably engageable with said shaft means and operable upon a predetermined rotational speed of said ground engaging means for operably coupling said generator with the vehicle solenoid operated fluid supply valve for operating the latter to supply and terminate fluid under pressure to the associated vehicle brake means for operation thereof when the predetermined speed is exceeded, starter means operatively connected with said generator and said supply valve and operated by associated ground mounted energizing means to prepare for operation of said speed control device, and means mounted on said vehicle frame structure and carrying said generator to and from operable engagement with said ground engaging means.

Claim 31

In a railroad vehicle having a frame structure and having ground engaging means, a vehicle speed control device comprising: a ground driven generator provided with shaft means driven by the rotation of said ground engaging means, vehicle mounted solenoid operated fluid supply valve, centrifugal speed responsive means operably engageable with said shaft means and operable upon a predetermined rotational speed of said ground engaging means for operably coupling said generator with the vehicle solenoid operated fluid supply valve for operating the latter to supply and terminate fluid under pressure to the associated vehicle brake means for operation thereof when the predetermined speed is exceeded, starter means operatively connected with said generator and said supply valve and operated by associated ground mounted energizing means to prepare for operation of said speed control device, and means mounted on said vehicle frame structure and carrying said generator to and from operable engagement with said ground engaging means.

Claim 32

The invention according to claim 22, and said means mounted on said vehicle frame structure further operatively carrying said centrifugal speed responsive means for moving said starter means from inoperable to operable position with respect to the ground engaging means and being mounted on said vehicle frame structure.

Claim 33

The invention according to claim 22, and said centrifugal speed responsive means including adjustment means for varying the predetermined speed at which the speed responsive means is operative.

Claim 34

The invention according to claim 22, and said centrifugal speed responsive means including an electrical switch being provided with centrifugal weight means adapted to move the switch to a closed position upon an increase in vehicle speed.

Claim 35

The invention according to claim 25, and adjustment means mounted on said centrifugal switch and including an adjustable set member fixedly mounted on the switch and a contact portion mounted operatively with said weight means and responsive to going into contact with said adjustable set member.

Claim 36

The invention according to claim 22, and said means mounted on the vehicle frame structure including a pivotally mounted frame carrying said generator in pivotal movement toward and away from said ground engaging means.

Claim 37

The invention according to claim 27, and a pneumatically operated ram unit moving said pivotally mounted frame from operative to inoperative position upon a change in pressure in said ram unit.

Claim 38

The invention according to claim 28, and said centrifugal speed responsive means being carried by said frame and being placed from operative to inoperative position also upon a change in presSure in said ram unit.

Claim 39

The invention according to claim 22, and pneumatic means for supplying the pressure fluid to said brake cylinder including a first reservoir for supplying fluid pressure by way of the solenoid valve to said brake cylinder and a second reservoir for supplying pressurized fluid to the brake cylinder via an associated second valve, flow control means in the form of a two-way valve including means responsive to fluid pressure from the solenoid valve or from the second valve to supply selectively pressurized fluid to the brake cylinder, said means including a flow blocking valve member movable in one direction by the solenoid valve and in the other direction by the second valve.

Claim 40

The invention according to claim 30, and a valve structure for supplying the pressurized fluid to a low pressure area including a bleed valve hole adjacent the solenoid valve and pressure responsive diaphragm valve movable to exhaust the air to the low pressure area when pressurized fluid is blocked by the two-way valve between the solenoid valve and the brake cylinder.

Claim 41

The invention according to claim 22, and said means mounted on said vehicle frame structure comprising an arm extending from said frame structure downwardly adjacent the ground, said arm carrying at its lower end said starter means for placing the starter means adjacent the associated ground mounted energizing means.

Claim 42

The invention according to claim 32, and said starter means including a magnetically responsive switch energizable by said ground mounted energizing means, and relay means operable upon closing of said switch to connect the generator with the solenoid operated valve when the predetermined vehicle speed is exceeded.

Claim 43

The invention according to claim 1, and said mounting means having flow control means including one-way flow means for actuation of said speed control device into an operative position, and bleed means in said flow control means for deactivating operation of said speed control device.

Claim 44

The invention according to claim 5, and flow control means between said ram means and a source of fluid pressure, said flow control means including a one-way valve permitting flow from the source of pressure to the ram means for moving said speed responsive unit to the inoperative position and including orifice means to allow escape of fluid under pressure from said ram means to said source of pressure in the other direction to place the speed responsive unit in the operative position.

Claim 45

The invention according to claim 16, and said mounting means having flow control means including one-way flow means for actuation of said speed control device into an operative position, and bleed means in said flow control means for deactivating operation of said speed control device.

Claim 46

The invention according to claim 20, and said means for pivotally moving said mounting means having flow control means including one-way flow means for actuation of said speed control device into an operative position, and bleed means in said flow control means for deactivating operation of said speed control device.

Claim 47

The invention according to claim 21, and flow control means between said ram means and a source of fluid pressure, said flow control means including a one-way valve permitting flow from the source of pressure to the ram means for moving said speed responsive unit to the inoperative position and including orifice means to allow escape of fluid under pressure from said ram means to said source of pressure in the other direction to place the speed responsive unit in the operative position.