GB840236A - Improvements in or relating to pressure change responsive devices, for example, switches - Google Patents

Improvements in or relating to pressure change responsive devices, for example, switches

Info

Publication number
GB840236A
GB840236A GB39458/57A GB3945857A GB840236A GB 840236 A GB840236 A GB 840236A GB 39458/57 A GB39458/57 A GB 39458/57A GB 3945857 A GB3945857 A GB 3945857A GB 840236 A GB840236 A GB 840236A
Authority
GB
United Kingdom
Prior art keywords
conduit
piston
fluid
fluid inlet
switches
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
GB39458/57A
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.)
Motors Liquidation Co
Original Assignee
Motors Liquidation Co
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 Motors Liquidation Co filed Critical Motors Liquidation Co
Publication of GB840236A publication Critical patent/GB840236A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/04—Control of fluid pressure without auxiliary power
    • G05D16/06—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule
    • G05D16/063—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane
    • G05D16/0644—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator
    • G05D16/0672—Control of fluid pressure without auxiliary power the sensing element being a flexible membrane, yielding to pressure, e.g. diaphragm, bellows, capsule the sensing element being a membrane the membrane acting directly on the obturator using several spring-loaded membranes
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D16/00—Control of fluid pressure
    • G05D16/20—Control of fluid pressure characterised by the use of electric means
    • G05D16/2086—Control of fluid pressure characterised by the use of electric means without direct action of electric energy on the controlling means
    • 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
    • H01H35/242—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow operated by one particular pressure-time function

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Reciprocating Pumps (AREA)

Abstract

840,236. Fluid actuation of switches. GENERAL MOTORS CORPORATION. Dec. 19, 1957 [Dec. 20, 1956; March 7, 1957], No. 39458/57. Class 38 (5). A device responsive to rapid changes of fluidpressure comprises a fluid motor connected by an unrestricted conduit to the fluid inlet, a second fluid motor connected by a restricted conduit to the fluid inlet, a movable member biased to a neutral position and connected at its opposite ends to the fluid motors and a device actuated by movement of the member from its neutral position. As shown, the fluid inlet 13 is connected by a conduit 14 to one side of a piston 11 and by a conduit 43, having a variable restriction 16, and conduits 17, 57 to the other side of a piston 12. Piston 11 acts directly on one end of an axially-slidable member 18 and piston 12 acts on the other end of the member through a conical spring 19. The member 18 is formed with cam surfaces 74 which co-operate with a follower 81 mounted on a control member 21 actuating a snap-action switch 22. The ends of the pistons 11, 12 are sealed to the casing parts 26, 27, 28 by flexible diaphragms 29, 31, respectively, and chambers 39, 63 formed between the parts 27, 28 and the diaphragms may be connected to a low-pressure drain conduit. A by-pass containing a non-return valve may be provided around the restriction 16 so that the device is only responsive to a pressure change in one direction (Fig. 3, not shown).
GB39458/57A 1956-12-20 1957-12-19 Improvements in or relating to pressure change responsive devices, for example, switches Expired GB840236A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US840236XA 1956-12-20 1956-12-20

Publications (1)

Publication Number Publication Date
GB840236A true GB840236A (en) 1960-07-06

Family

ID=22182392

Family Applications (1)

Application Number Title Priority Date Filing Date
GB39458/57A Expired GB840236A (en) 1956-12-20 1957-12-19 Improvements in or relating to pressure change responsive devices, for example, switches

Country Status (1)

Country Link
GB (1) GB840236A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3654412A (en) * 1971-02-10 1972-04-04 Nissan Motor Motor vehicle pressure actuated deformation responsive switch with piston actuator and vent opening
US3678231A (en) * 1970-07-28 1972-07-18 Negretti & Zambra Aviat Ltd Apparatus for detecting rapid change of fluid pressure
US3717734A (en) * 1971-09-02 1973-02-20 Bendix Corp Pressure rate change responsive diaphragm switch with relatively hard rebound prevention member on diaphragm

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3678231A (en) * 1970-07-28 1972-07-18 Negretti & Zambra Aviat Ltd Apparatus for detecting rapid change of fluid pressure
US3654412A (en) * 1971-02-10 1972-04-04 Nissan Motor Motor vehicle pressure actuated deformation responsive switch with piston actuator and vent opening
US3717734A (en) * 1971-09-02 1973-02-20 Bendix Corp Pressure rate change responsive diaphragm switch with relatively hard rebound prevention member on diaphragm

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