GB1357839A - Differential pressure responsive switch - Google Patents
Differential pressure responsive switchInfo
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Hydraulic Control Valves For Brake Systems (AREA)
- Braking Arrangements (AREA)
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.
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)
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)
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 |
-
1971
- 1971-12-13 US US00207365A patent/US3736393A/en not_active Expired - Lifetime
-
1972
- 1972-09-15 CA CA151,830A patent/CA952948A/en not_active Expired
- 1972-11-13 GB GB5223772A patent/GB1357839A/en not_active Expired
- 1972-11-23 FR FR7241634A patent/FR2163449B1/fr not_active Expired
- 1972-12-12 JP JP47124044A patent/JPS4865371A/ja active Pending
Also Published As
Publication number | Publication date |
---|---|
JPS4865371A (en) | 1973-09-08 |
US3736393A (en) | 1973-05-29 |
FR2163449B1 (en) | 1976-06-04 |
CA952948A (en) | 1974-08-13 |
FR2163449A1 (en) | 1973-07-27 |
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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 |