GB1592539A - Compressed air brake systems - Google Patents

Compressed air brake systems Download PDF

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Publication number
GB1592539A
GB1592539A GB2147878A GB2147878A GB1592539A GB 1592539 A GB1592539 A GB 1592539A GB 2147878 A GB2147878 A GB 2147878A GB 2147878 A GB2147878 A GB 2147878A GB 1592539 A GB1592539 A GB 1592539A
Authority
GB
United Kingdom
Prior art keywords
brake
compressed air
line
control valve
valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB2147878A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB1592539A publication Critical patent/GB1592539A/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R25/00—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles
    • B60R25/01—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens
    • B60R25/08—Fittings or systems for preventing or indicating unauthorised use or theft of vehicles operating on vehicle systems or fittings, e.g. on doors, seats or windscreens operating on brakes or brake systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
    • B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
    • B60T13/24—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release the fluid being gaseous
    • B60T13/26—Compressed-air systems
    • B60T13/261—Compressed-air systems systems with both indirect application and application by springs or weights and released by compressed air
    • B60T13/263—Compressed-air systems systems with both indirect application and application by springs or weights and released by compressed air specially adapted for coupling with dependent systems, e.g. tractor-trailer systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
    • B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
    • B60T17/18—Safety devices; Monitoring

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Transportation (AREA)
  • Valves And Accessory Devices For Braking Systems (AREA)
  • Regulating Braking Force (AREA)

Description

(54) IMPROVEMENTS IN OR RELATING TO COMPRESSED AIR BRAKE SYSTEMS (71) We, ROBERT BOSCH GMBH, a German company of Postfach 50, 7 Stuttgart 1, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:- The present invention relates to compressed air brake systems for vehicles.
A problem common to all vehicles is that of providing security against theft, and commercial vehicles having a compressed air brake system are not yet customarily provided with a simple anti-theft device, so that tractor vehicle-trailer vehicle combinations are frequently being stolen, particularly when they are loaded with valuable freight.
In the case of vehicles having an hydraulic brake system, it is already known to main hydraulic brake pressure in a wheel brake cylinder by means of a valve which is fixable so as to be secure against unauthorised tampering. However, a device of this type is not operationally reliable, since no hydraulic valve is sufficiently fluid-tight to prevent a decrease in the hydraulic pressure and to prevent the brake pressure in the wheel cylinder from dropping to an extent where the vehicle can be driven away or can roll away.
According to the present invention there is provided a compressed air brake system for commercial vehicles, having a compressed air supply, a control valve and at least one spring-loaded brake cylinder whose energystoring spring is stressed by compressed air and rendered inoperative when the control valve is in its position for releasing the brake and, when the control valve is in its position for applying the brake, the said energystoring spring is relieved of stress and actuates the brake upon removal of the action of the compressed air, in which a compressed air line leading to the spring-loaded brake cylinder is provided with means whereby communication between the spring-loaded cylinder and a relief point can be established in a manner at least resistant against unauthorised tampering.
A compressed air brake system embodying the present invention can have the advantage that a commercial vehicle cannot be readily driven away by unauthorised persons. The energy-storing spring has applied the brake, and, in addition to providing compressed air, possibly only by starting the engine, the control valve, or a separate parking control valve, also has to be moved from its fixed, tamper-resistant position, in which it is preferably locked with a lock and key, in order to release the brake applied by the energy-storing spring. Thus, in order to release the brake, an ignition key is required for switching on the means for producing the compressed air, as well as the key for releasing the control valve or separate parking valve from its fixed position. It is unlikely that unauthorised persons can fulfil all these pre-requisites for driving away a commercial vehicle.
The invention will be further described by way of example, with reference to the accompanying drawing, which illustrates two embodiments of the invention.
A brake system on a tractor vehicle has a compressor I which supplies compressed air to two reservoirs 5 and 6, a secondary load 7 and a trailer vehicle air supply line 8 by way of a pressure regulator 2, an anti-frosting pump 3 and a 4-circuit protective valve assembly 4. Two tractor vehicle service brake circuits I and II are associated respectively with the two reservoirs 5 and 6 and can supply compressed air to a front wheel brake cylinder 10 and a rear wheel brake cylinder 11 by way of a foot-operated two-circuit brake valve 9. Compressed air lines 12 and 13 of the two brake circuits I and II are connected to a trailer vehicle brake control valve 14 to which is also connected a third line 15 which leads from a spring-loaded brake circuit having a manually operable parking brake valve 16 and two springloaded brake cylinders 17 and 18. The spring-loaded brake circuit is supplied with compressed air from the trailer vehicle air supply line 8 by way of a non-return valve 19.
A compressed air line coupling head 20 is located at the end of thc trailer vehicle compressed air supply linc 8 and, down strcam of the trailer vehicle brake control valve 14, a linc 21 leads to a trailer vehicle brake line coupling head 22. Furthermore. a branch line 23 leads from the trailer vehicle compressed air supply line coupling head 20 to the trailer vehicle brake control valve 14.
Finally, a brake line 24 leads from the holed brake valve unit 16 to the spring-load cr brake cylinders 17 and 18.
The manually operable parking brake valve 16 has a housing 27 which carries an actuating lever 34. The housing 27 has a compressed air line inlet connection 3 1 for the compressed air line, a connection 32 fir the brake line 24, and an atmospheric air connection 33 (acting as a relief point). When the vehicle is ready to travel, the parking brake valve 16 maintains communication between the compressed air line and the brake line 24 and, when the parking brake valve 16 is in its illustrated braking position.
communication with the compressed air line is shut off and the brake line 24 communicates with the atmospheric air.
The housing 27 is provided with a projection point 35, and a second projection point 36 is provided on the actuating lever 34.
When the valve 16 is in its illustrated position, the two projection points 35 and 36 are lockable in their mutual positions by means of a lock 38 which is lockable by a key 37, so that unauthoriscd persons cannot move the lever 34.
Alternatively or additionally as is shown by a connection line 39 (shown by a broken line), it is al o possible to connect the spring loaded cylinders to a special control valve 40.
The control valve 40 has a relief point 41 and is assembled with, or connected to, a cylinder lock 42 and is lockable by means of a key 43.
The control valve 40 is arranged at a point in the driver's cab which is readily accessible from the drivcr's seat. Preferably, the line connection 39 is a flexible line made from plastics material.
The system described above operates as follows: When the vehicle, parked in a theftresistant manner, is to be driven away, the ignition system has to be actuated by means of an ignition key and the engine of the vehicle has to be started. The compressor of the compressed air brake system supplies compressed air to the system. llowever, this compressed air cannot stress the energystoring springs in the spring-loaded brake cylinders 17 and 18 and cannot release the brake, since the manually operated parking brake valve 16 or the control valve 40 allows compressed air to flow to the atmosphere.
A pressure can build up in the springloaded brake cylinders 17 and 18 only when the driver has unlocked the valve 16 or 40 by means of the key 37 or 43 and has brought the valve into a different switching position in which communication with the atmospheric air (relief point 33 or 41) has been interrupted. The energy-storing springs are then compressed and the brakes are released.
When the vehicle is to be parked in a theft proof manner after a journey, the valve 16 or 40 is brought into the position for venting the compressed air line and is locked in this position in a theft-resistant manner.
WHAT WE CLAIM IS: 1. A compressed air brake system for commercial vehicles. having a compressed air supply, a control valve and at least one spring-loaded brake cylinder whose energystoring spring is stressed by compressed air and rendered inoperative when the control valve is in its position for releasing the brake and, when the control valve is in its position for applying the brake, the said energystoring spring is relieved of stress and actuates the brake upon removal of the action of the compressed air, in which a compressed air line leading to the spring-loaded brake cylinder is provided with means whereby communication between the spring-loaded cylinder and a relief point can be established in a manner at least resistant against unauthorised tampering.
2. A compressed air brake system as claimed in claim 1, in which the said means are provided on the control valve which is in the form of a manually operable parking brake valve and which is lockable in a tamper-resistant manner when in its braking position.
3. A compressed air brake system as claimed in claim 1, in which the said means are provided on a separate control valve which is assembled with, or coupled to, a lock, preferably a cylinder lock.
4. A compressed air brake system as claimed in claim 3, in which the separate control valve is adapted so that it can be arranged in the driver's cab at a location which is readily accessible from the driver's seat, and in which a compressed air line, connecting the control valve to the springloaded brake cylinder is a flexible line made of plastics material.
5. A compressed air brake system for commercial vehicles, constructed and arranged and adapted to operate substantially as hereinbefore particularly described with reference to and as illustrated in the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. located at the end of thc trailer vehicle compressed air supply linc 8 and, down strcam of the trailer vehicle brake control valve 14, a linc 21 leads to a trailer vehicle brake line coupling head 22. Furthermore. a branch line 23 leads from the trailer vehicle compressed air supply line coupling head 20 to the trailer vehicle brake control valve 14. Finally, a brake line 24 leads from the holed brake valve unit 16 to the spring-load cr brake cylinders 17 and 18. The manually operable parking brake valve 16 has a housing 27 which carries an actuating lever 34. The housing 27 has a compressed air line inlet connection 3 1 for the compressed air line, a connection 32 fir the brake line 24, and an atmospheric air connection 33 (acting as a relief point). When the vehicle is ready to travel, the parking brake valve 16 maintains communication between the compressed air line and the brake line 24 and, when the parking brake valve 16 is in its illustrated braking position. communication with the compressed air line is shut off and the brake line 24 communicates with the atmospheric air. The housing 27 is provided with a projection point 35, and a second projection point 36 is provided on the actuating lever 34. When the valve 16 is in its illustrated position, the two projection points 35 and 36 are lockable in their mutual positions by means of a lock 38 which is lockable by a key 37, so that unauthoriscd persons cannot move the lever 34. Alternatively or additionally as is shown by a connection line 39 (shown by a broken line), it is al o possible to connect the spring loaded cylinders to a special control valve 40. The control valve 40 has a relief point 41 and is assembled with, or connected to, a cylinder lock 42 and is lockable by means of a key 43. The control valve 40 is arranged at a point in the driver's cab which is readily accessible from the drivcr's seat. Preferably, the line connection 39 is a flexible line made from plastics material. The system described above operates as follows: When the vehicle, parked in a theftresistant manner, is to be driven away, the ignition system has to be actuated by means of an ignition key and the engine of the vehicle has to be started. The compressor of the compressed air brake system supplies compressed air to the system. llowever, this compressed air cannot stress the energystoring springs in the spring-loaded brake cylinders 17 and 18 and cannot release the brake, since the manually operated parking brake valve 16 or the control valve 40 allows compressed air to flow to the atmosphere. A pressure can build up in the springloaded brake cylinders 17 and 18 only when the driver has unlocked the valve 16 or 40 by means of the key 37 or 43 and has brought the valve into a different switching position in which communication with the atmospheric air (relief point 33 or 41) has been interrupted. The energy-storing springs are then compressed and the brakes are released. When the vehicle is to be parked in a theft proof manner after a journey, the valve 16 or 40 is brought into the position for venting the compressed air line and is locked in this position in a theft-resistant manner. WHAT WE CLAIM IS:
1. A compressed air brake system for commercial vehicles. having a compressed air supply, a control valve and at least one spring-loaded brake cylinder whose energystoring spring is stressed by compressed air and rendered inoperative when the control valve is in its position for releasing the brake and, when the control valve is in its position for applying the brake, the said energystoring spring is relieved of stress and actuates the brake upon removal of the action of the compressed air, in which a compressed air line leading to the spring-loaded brake cylinder is provided with means whereby communication between the spring-loaded cylinder and a relief point can be established in a manner at least resistant against unauthorised tampering.
2. A compressed air brake system as claimed in claim 1, in which the said means are provided on the control valve which is in the form of a manually operable parking brake valve and which is lockable in a tamper-resistant manner when in its braking position.
3. A compressed air brake system as claimed in claim 1, in which the said means are provided on a separate control valve which is assembled with, or coupled to, a lock, preferably a cylinder lock.
4. A compressed air brake system as claimed in claim 3, in which the separate control valve is adapted so that it can be arranged in the driver's cab at a location which is readily accessible from the driver's seat, and in which a compressed air line, connecting the control valve to the springloaded brake cylinder is a flexible line made of plastics material.
5. A compressed air brake system for commercial vehicles, constructed and arranged and adapted to operate substantially as hereinbefore particularly described with reference to and as illustrated in the accompanying drawing.
GB2147878A 1977-12-10 1978-05-23 Compressed air brake systems Expired GB1592539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19772755178 DE2755178A1 (en) 1977-12-10 1977-12-10 COMPRESSED AIR BRAKE SYSTEM

Publications (1)

Publication Number Publication Date
GB1592539A true GB1592539A (en) 1981-07-08

Family

ID=6025852

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2147878A Expired GB1592539A (en) 1977-12-10 1978-05-23 Compressed air brake systems

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DE (1) DE2755178A1 (en)
GB (1) GB1592539A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2665628A4 (en) * 2011-01-18 2016-05-04 Barry John Bryar Vehicle control system and method

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4471852A (en) * 1982-02-08 1984-09-18 Ike Schield Anti-theft devices for automotive vehicles
SE441174B (en) * 1983-02-18 1985-09-16 Vihab DEVICE FOR THE PREVENTION OF THE VEHICLE OF A VEHICLE AND A TRAILER, WHICH OPERATING BRAKES AND PARKING BRAKES ARE MADE BY PRESSURE-MANOVERED BRAKES, WHICH DEVICE INCLUDES ONE OF A CODLED CONTROL VALVE
FR2562487B1 (en) * 1984-04-05 1986-09-05 Moio Bruno ANTI-THEFT DEVICE FOR VEHICLES BY NEUTRALIZATION OF THE ELECTRICAL CIRCUIT AND BY LOCKING THE BRAKES AFTER SOLICITATION
FR2631298A1 (en) * 1988-05-11 1989-11-17 Raimbault Patrice Anti-theft device for vehicles equipped with hydraulic or pneumatic locomotion and/or actuating means
DE4409699A1 (en) * 1994-03-22 1995-09-28 Goebelsmann Peter Antitheft device for vehicles having compressed air systems
DE102008030303A1 (en) * 2008-06-25 2009-12-31 Hetzel, Jürgen Anti-theft system for e.g. semi-trailer, has parking brake with actuating valve, which is fastened at vehicle frames, includes U-shape actuating heads with two holes for U-lock and is locked by U-lock in position to and on brake

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2665628A4 (en) * 2011-01-18 2016-05-04 Barry John Bryar Vehicle control system and method

Also Published As

Publication number Publication date
DE2755178A1 (en) 1979-06-13

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee