GB515440A - Improvements in or relating to servo brake operating mechanism for vehicles - Google Patents

Improvements in or relating to servo brake operating mechanism for vehicles

Info

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
Application number
GB1642038A
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.)
ERIC CARLTON OTTAWAY
LONDON PASSENGER TRANSP BOARD
Wabco Automotive UK Ltd
Original Assignee
ERIC CARLTON OTTAWAY
LONDON PASSENGER TRANSP BOARD
Clayton Dewandre Co Ltd
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 ERIC CARLTON OTTAWAY, LONDON PASSENGER TRANSP BOARD, Clayton Dewandre Co Ltd filed Critical ERIC CARLTON OTTAWAY
Priority to GB1642038A priority Critical patent/GB515440A/en
Publication of GB515440A publication Critical patent/GB515440A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B60VEHICLES IN GENERAL
    • B60TVEHICLE 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
    • B60T15/00Construction arrangement, or operation of valves incorporated in power brake systems and not covered by groups B60T11/00 or B60T13/00
    • B60T15/02Application and release valves
    • B60T15/04Driver's valves
    • B60T15/043Driver's valves controlling service pressure brakes

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.
GB1642038A 1938-06-01 1938-06-01 Improvements in or relating to servo brake operating mechanism for vehicles Expired GB515440A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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