GB515440A - Improvements in or relating to servo brake operating mechanism for vehicles - Google Patents
Improvements in or relating to servo brake operating mechanism for vehiclesInfo
- Publication number
- GB515440A GB515440A GB1642038A GB1642038A GB515440A GB 515440 A GB515440 A GB 515440A GB 1642038 A GB1642038 A GB 1642038A GB 1642038 A GB1642038 A GB 1642038A GB 515440 A GB515440 A GB 515440A
- Authority
- GB
- United Kingdom
- Prior art keywords
- spring
- pressure
- piston
- pedal
- 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
Links
Classifications
-
- 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
- B60T15/00—Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
- B60T15/02—Application and release valves
- B60T15/04—Driver's valves
- B60T15/043—Driver's valves controlling service pressure brakes
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Abstract
515,440. Fluid-pressure brakes. OTTAWAY, E. C., WILLETT, S. E., LONDON PASSENGER TRANSPORT BOARD, and CLAYTON DEWANDRE CO., Ltd. June 1, 1938, No. 16420. [Class 103 (i)] In a manually operated selflapping valve for fluid-pressure brakes, that is controlled by a piston subject to brake cylinder pressure opposed to the pressure of a spring that is stressed by the pedal movement, a second spring which reacts on the pedal but not on the piston comes into action after a moderate brake application has been made so as to increase the rate of change of pedal pressure with cylinder pressure. A further spring may come 'into action between the pedal and the piston at about the same time as the second spring. The compressed air supply, brake cylinder and exhaust are connected respectively to ports 2, 3, 4. The supply and exhaust valves 5, 12 are carried by a rod 8, the valve 12 being arranged to seat on a passage 13 through the piston 11 which is subject to brake cylinder pressure through ports 3,24. Movement of the plunger 16 by the pedal and rod 16a moves the piston 11 by the spring 17 to seat the valve 12 and lift the supply valve 5. When the cylinder pressure on the piston 11 is sufficient to overcome the pressure of the spring 17 the piston moves back and the valve 5 closes. When a moderate brake application has been effected, the plunger 16 engages the seating ring 20 of a spring 21 which may be precompressed between that ring and a fixed ring 22, the resistance of this spring being thus added to that of the spring 17 with further pedal movement. When or just before the spring 21 is engaged, the plunger 16 may engage a further spring 26 which abuts on an extension 18 of the piston 11 so that the pedal movement for a given increase of cylinder pressure is reduced during the second stage of brake application. The casing 1 may be fixed or may be connected through a lever to the brakes to enable the brakes to be applied by direct pedal pressure assisted by the fluid pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1642038A GB515440A (en) | 1938-06-01 | 1938-06-01 | Improvements in or relating to servo brake operating mechanism for vehicles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1642038A GB515440A (en) | 1938-06-01 | 1938-06-01 | Improvements in or relating to servo brake operating mechanism for vehicles |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB515440A true GB515440A (en) | 1939-12-05 |
Family
ID=10076993
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1642038A Expired GB515440A (en) | 1938-06-01 | 1938-06-01 | Improvements in or relating to servo brake operating mechanism for vehicles |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB515440A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2698205A (en) * | 1948-01-27 | 1954-12-28 | Bendix Aviat Corp | Control valve |
| US3449020A (en) * | 1968-02-19 | 1969-06-10 | Berg Mfg & Sales Co | Dual force treadle application valve |
| US3515441A (en) * | 1969-09-22 | 1970-06-02 | Applied Power Ind Inc | Power control device |
-
1938
- 1938-06-01 GB GB1642038A patent/GB515440A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2698205A (en) * | 1948-01-27 | 1954-12-28 | Bendix Aviat Corp | Control valve |
| US3449020A (en) * | 1968-02-19 | 1969-06-10 | Berg Mfg & Sales Co | Dual force treadle application valve |
| US3515441A (en) * | 1969-09-22 | 1970-06-02 | Applied Power Ind Inc | Power control device |
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