GB1357839A - Differential pressure responsive switch - Google Patents

Differential pressure responsive switch

Info

Publication number
GB1357839A
GB1357839A GB5223772A GB5223772A GB1357839A GB 1357839 A GB1357839 A GB 1357839A GB 5223772 A GB5223772 A GB 5223772A GB 5223772 A GB5223772 A GB 5223772A GB 1357839 A GB1357839 A GB 1357839A
Authority
GB
United Kingdom
Prior art keywords
plunger
clip
head
terminal
pressure differential
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
GB5223772A
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.)
Bendix Corp
Original Assignee
Bendix Corp
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 Bendix Corp filed Critical Bendix Corp
Publication of GB1357839A publication Critical patent/GB1357839A/en
Expired legal-status Critical Current

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
    • 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
    • B60T17/22—Devices for monitoring or checking brake systems; Signal devices
    • B60T17/226—Devices for monitoring or checking brake systems; Signal devices using devices being responsive to the difference between the fluid pressions in conduits of multiple braking systems
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H35/00—Switches operated by change of a physical condition
    • H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
    • H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder

Abstract

1357839 Pressure differential responsive indicators BENDIX CORP 13 Nov 1972 [13 Dec 1971] 52237/72 Headings F2E and F2F In a pressure differential responsive switch, two piston portions 48, 61, joined by a stem 80, are acted upon by pressure fluid in respective chambers 58, 72 in respective circuits of a dual hydraulic brake system, the stem having a land part 94 bounded by two ramps 86, 88; an electrically non-conductive body 95 secured to the switch housing 26 has a cylindrical bore 100 containing an electrical terminal 106, fixed at one end thereto and its other end connected to an indicator, and a plunger 114 having an axial projection 120 with a spherical head 122 and a cylindrical head on the other end, the spherical head contacting the land part when the pressures in the two circuits are equal so that a clip associated with the plunger is maintained out of contact with the terminal, but, upon a pressure differential occurring across portions 48, 61, the spherical head slides down one of the ramps, aided by resilient means located in the cylindrical bore 100, to allow clip-terminal contact to actuate the indicator until the pressures are subsequently equalized. The piston part 48 is exposed to fluid in a front wheel disc brake circuit which includes a metering valve 24, and the piston part 61 is exposed to fluid in a rear wheel drum brake circuit. The plunger 114 has the clip 134, Fig. 2, riveted to the cylindrical head 116, the clip having inwardly projecting prongs 140 with outwardly arcuate ends 144 which, when a pressure differential occurs, are biased by a spring 124 to contact a head 108 of the terminal thereby connecting a visual indicator to earth via the housing 26, the indicator being connected to a power source. Fig. 5 shows a similar clip which is located at the upper end of the spring 124 whose prongs when the plunger 114 is on the land part 80, are held away from the terminal head 108 by an extension 250 of the plunger pressing against the inner prong surfaces.
GB5223772A 1971-12-13 1972-11-13 Differential pressure responsive switch Expired GB1357839A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US20736571A 1971-12-13 1971-12-13

Publications (1)

Publication Number Publication Date
GB1357839A true GB1357839A (en) 1974-06-26

Family

ID=22770241

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5223772A Expired GB1357839A (en) 1971-12-13 1972-11-13 Differential pressure responsive switch

Country Status (5)

Country Link
US (1) US3736393A (en)
JP (1) JPS4865371A (en)
CA (1) CA952948A (en)
FR (1) FR2163449B1 (en)
GB (1) GB1357839A (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1471029A (en) * 1974-05-17 1977-04-21 Girling Ltd Pressure control valves
JPS5291473U (en) * 1975-12-29 1977-07-08
FR2501605A1 (en) * 1981-03-16 1982-09-17 Dba Detector for unbalance in motor vehicle dual braking circuit - uses sliding piston with ball contacting centre section to operate electrical contacts in alarm circuit when slid by pressure differential
US5046313A (en) * 1989-07-27 1991-09-10 Allied-Signal Inc. Master cylinder with fluid level and pressure failure detection

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2060377A (en) * 1933-08-01 1936-11-10 Glenn D Knodle Motor vehicle rear end spotlight switch
GB578032A (en) * 1944-08-02 1946-06-12 Eustace Russell Booth Improvements in push-button electric switches
US3427582A (en) * 1965-10-07 1969-02-11 Bendix Corp Failure indicating apparatus for a split brake system
US3448230A (en) * 1967-03-28 1969-06-03 Wagner Electric Corp Control valve and system
US3542438A (en) * 1969-04-07 1970-11-24 Wagner Electric Corp Control valve
US3622934A (en) * 1969-05-30 1971-11-23 Matsushita Electric Ind Co Ltd Variable resistor of sliding type with switch activated by slider
US3606487A (en) * 1969-11-04 1971-09-20 Wagner Electric Corp Control valve
US3637963A (en) * 1970-03-02 1972-01-25 Weatherhead Co Brake warning switch with bypass

Also Published As

Publication number Publication date
CA952948A (en) 1974-08-13
JPS4865371A (en) 1973-09-08
FR2163449A1 (en) 1973-07-27
US3736393A (en) 1973-05-29
FR2163449B1 (en) 1976-06-04

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee