automatic hand brake release ppt
#1

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#2
A hand brake control system for a rail vehicle hand brake having a release trigger. The system includes a cylinder for activating the release trigger of the hand brake and a source of pressure. A first valve selectively connects either the source of pressure at a first input or a second input to the cylinder at an output. A second valve selectively connects either the source of pressure or exhaust to the second input of the first valve at the output of the second valve. The first valve is a manually operated valve and the second valve is an electro-pneumatic valve. Linkage allows actuation of the first valve from at least two location about the vehicle.
Claims:

1. A hand brake control system for a rail vehicle hand brake having a release trigger, the system comprising:a cylinder for activating the release trigger of the hand brake;a source of pressure;a first valve for selectively connecting either the source of pressure at a first input or a second input to the cylinder at an output;a valve for selectively connecting either the source of pressure or exhaust to the second input of the first valve at the output of the second valve.

2. The system according to claim 1, wherein the first valve is a manually operated valve and the second valve is an electro-pneumatic valve.

3. The system according to claim 1, wherein the first valve is a manually operated valve having a stable position connecting the second input of the first valve to the output of the first valve and a manual operated position connecting the first input of the first valve to the output of the first valve.

4. The system according to claim 3, wherein the first valve has a manually operated rocker mechanism.

5. The system according to claim 3, wherein the second valve has a stable position connecting exhaust to the second input of the first valve and an activated position connecting the source of pressure to the second input of the first valve.

6. The system according to claim 3, including linkage connected to the first valve and extending to at least two locations about the sides of the vehicle for manual operation of the first valve without mounting the vehicle.

7. The system according to claim 1, wherein the second valve has a stable position connecting exhaust to the second input of the first valve and an activated position connecting the source of pressure to the second input of the first valve.

8. The system according to claim 7, wherein the second valve is an electro-pneumatic valve.

9. The system according to claim 1, wherein the source of pressure is a reservoir on the vehicle.

10. The system according to claim 9, including a tap connected to the reservoir for connection of a source of pressure off the vehicle.

11. The system according to claim 1, including a check valve between the source of pressure and the first and second valves to pre-charge the connection to the first and second valves.

12. A hand brake control system for a rail vehicle hand brake having a release trigger, the system comprising:a cylinder for activating the release trigger of the hand brake;a source of pressure;a manually operated valve having a stable position connecting a second input connected to exhaust to an output connected to the cylinder and a manual operated position connecting a first input connected to the source of pressure to the output connected to the cylinder.; andlinkage connected to the first valve and extending to at least two locations about the sides of the vehicle for manual operation of the first valve without mounting the vehicle.

13. The system according to claim 12, wherein the locations are on opposite sides of the vehicle.

14. The system according to claim 12, wherein the valve has a manually operated rocker mechanism.
Description:

BACKGROUND AND SUMMARY

[0001]The present disclosure relates generally to automatic hand brakes and more specifically to a control system for automatic release of hand brakes.

[0002]Hand or parking brakes on rail vehicles generally include a chain connected to the vehicle brakes and wound around a wheel. The brakes are applied by rotating the wheel and tensioning the chain. The hand brake includes a trigger or lever which, when activated, automatically releases the tension on the chain and releases the parking hand brake.

[0003]Two cylinders may be provided on the hand brake to apply the brakes by turning the wheel to tension the chain and a second cylinder to release the brakes by interacting with the release trigger or lever. A pneumatic system to control the two cylinders manually is illustrated in U.S. Pat. No. 6,394,559, for example. The use of parallel manually actuated valves and electro-pneumatic valves is described in U.S. Pat. No. 7,014,275. The actuation of the electro-pneumatic valves as discussed herein may be by an electrically controlled pneumatic (ECP) brake network and through the cars control unit (CCU). The overall control system is described, for example, in U.S. Pat. No. 7,073,753.

[0004]Remote control of the hand brake by hand-held terminal is described in U.S. Pat. No. 6,175,784.

[0005]The present hand brake control system for a rail vehicle hand brake having a release trigger includes a cylinder for activating the release trigger of the hand brake and a source of pressure. A first valve selectively connects either the source of pressure at a first input or a second input to the cylinder at an output. A second valve selectively connects either the source of pressure or exhaust to the second input of the first valve at the output of the second valve. The first valve may be a manually operated valve and the second valve may be an electro-pneumatic valve.

[0006]The first valve is a manually operated valve having a stable position connecting the second input of the first valve to the output of the first valve and a manual operated position connecting the first input of the first valve to the output of the first valve. The first valve has a manually operated rocker mechanism.

[0007]Linkage may be connected to the first valve and extends to at least two locations about the sides of the vehicle for manual operation of the first valve without mounting the vehicle.

[0008]The second valve has a stable position connecting exhaust to the second input of the first valve and an activated position connecting the source of pressure to the second input of the first valve.

[0009]The source of pressure may be a reservoir on the vehicle or a source of pressure off the vehicle connected by a tap. A check valve between the source of pressure and the first and second valves pre-charges the connection to the first and second valves.

[0010]Other objects, advantages and novel features of the present invention will become apparent from the following detailed description of the invention when considered in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011]FIG. 1 is a schematic of a hand brake control system for a rail vehicle hand brake according to the present disclosure.

[0012]FIG. 2 cross-sectional view of a manual valve for use in the present system.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013]A control system for automatic release of a hand brake is illustrated in FIG. 1. A pneumatic cylinder 10 via a clevis 12, or a similar mechanism, like a pushrod with a ball-end, and a corresponding socket geometry on the release lever, is connected to the trigger or the release lever of the hand brake on a vehicle. A first source of pressure is shown as a reservoir 14. The reservoir 14 includes an emergency reservoir portion 16 and an auxiliary reservoir portion 18. Such structure is generally available on the vehicle. Even though it is shown as a two compartment reservoir, any other reservoir may be used. This is just an example of a reservoir. The reservoir portion 16 is connected to line 20 by a cutout cock 22, a one way check valve 24 and a choke or orifice 26. A port 28 or quick disconnect fitting is also provided to allow an external source of pressure not on the vehicle to be connected to line 20. This may be, for example, from a way-side air supply and offers an alternative to the emergency reservoir if the emergency reservoir does not have sufficient pressure to operate the system.

[0014]The source of pressure in line 20 is connected to a first input 32 of a first valve 30. The first valve 30 is illustrated as a manually operated valve. A second input 34, normally connected to exhaust or atmosphere is provided on the valve 30. The output 36 of valve 30 is connected to the cylinder 10. Spring 38 biases the valve 30 in the shown position where the supply pressure at input 32 is not connected to the brake release cylinder. In this position, the release cylinder 10 is exhausted through connection 34. This is a stable position of the first valve 30.

[0015]The manual operator 40 of the valve 30 is connected at joint 42 to links 44. Links 44 extend to the exterior of the vehicle allowing access at various points for manual operation at various points adjacent to the vehicle without mounting the vehicle. As shown in FIG. 2, the valve's 30 manual actuating mechanism 40 may be a rocker type mechanical lifter that can be actuated from any 360 degrees about its center. The rocker mechanism also provides for automatic reset of the valve 30 when the mechanical actuator is returned to its neutral position.

[0016]A second valve 50 is illustrated as an electro-pneumatic valve. The first input 52 is connected to the pressurized supply line 20. A second input 54 is connected to exhaust or atmosphere. The output 56 is connected to the second input 34 of the first valve 30. Spring 58 biases the valve 50 in the position shown, wherein the connection to the supply line 52 is terminated and exhaust at input 54 is connected to its output 56 and input 34 of valve 30. Thus, in the stable position shown of the two valves 30 and 50, the release cylinder 10 is deactivated. By connecting valve 50 between the exhaust EX and the input 34 of the valve 30, any system leaking is allowed to go to exhaust. This prevents undesired release of the hand brake.
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