US3321594A - Fluid pressure actuated switch - Google Patents

Fluid pressure actuated switch Download PDF

Info

Publication number
US3321594A
US3321594A US474715A US47471565A US3321594A US 3321594 A US3321594 A US 3321594A US 474715 A US474715 A US 474715A US 47471565 A US47471565 A US 47471565A US 3321594 A US3321594 A US 3321594A
Authority
US
United States
Prior art keywords
recess
upper housing
contact
switch
diaphragm
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 - Lifetime
Application number
US474715A
Other languages
English (en)
Inventor
Donald A Reise
Jr Charles W Jeep
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.)
ACF Industries Inc
Original Assignee
ACF Industries Inc
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 ACF Industries Inc filed Critical ACF Industries Inc
Priority to US474715A priority Critical patent/US3321594A/en
Priority to GB30321/66A priority patent/GB1100999A/en
Priority to FR70474A priority patent/FR1487572A/fr
Priority to DE19661590017D priority patent/DE1590017B1/de
Priority to SE10122/66A priority patent/SE338085B/xx
Application granted granted Critical
Publication of US3321594A publication Critical patent/US3321594A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • H01H35/34—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by diaphragm

Definitions

  • This invention relates to fluid pressure actuated switches for electrical circuits and consists particularly in a novel safety switch which responds to the presence or absence of normal operating pressure in the oil feed line of an engine.
  • Fluid pressure actuated switches find utility in a number of applications.
  • One application of importance to this invention is the use of a fluid pressure actuated electrical switch in the circuit of an electrical fuel pump when used on an automotive vehicle.
  • the pump motor is energized when the ignition circuit is closed.
  • the fuel pump be operating in the event that the engine is not running or in case the oil pressure falls below a safe operating level.
  • Safety considerations make it imperative that in the event a vehicle equipped with an electric fuel pump is involved in an accident, that the pump cease pumping as soon as possible, even though the ignition switch is not turned to the off position.
  • An example of this condition would be one in which the vehicle is overturned, in which case the enginewould soon stop running, but the ignition switch might not be turned oif immediately by the driver.
  • Another object is to provide such a switch in which the actuator element has adequate movement to compensate for wear and inaccuracies of manufacture.
  • Still another object is to provide such a switch having a switch actuating diaphragm with means for positively limiting the throw of the diaphragm to prevent excessive distortion thereof.
  • Still another object is to provide a switching action which causes wiping action between the switch points to insure better contact therebeween.
  • Yet another object is to provide a pressure actuated switch that is sensitive and will operate properly under wide variation of pressures produced by an engine lubricating system under the dilferent operating conditions of the vehicle.
  • Still another object is to provide a novel pressure switch of the double contact type in which the respective stationwhen there is a pressure and when there is an absence of pressure in the system.
  • FIGURE 1 is a top view-of the switch;
  • FIGURE 2 is a vertical center section therethrough;
  • FIGURE 3 is a cross section taken along the lines 3-3 of FIGURE 2;
  • FIGURE 4 is another vertical section of the switch;
  • FIGURE 5 is a schematic electrical diagram illustrating the method of installation of the switch.
  • the switch comprises a top cap member having electrodes 12, 14 and 16 thereon.
  • a vent passage 15 can be provided alongside one or more of the electrodes if desired to permit free entry and egress of air to the space above a diaphragm 30.
  • Cap 10 is preferably made of an electrically nonconductive or insulating material such as rubber, Bakelite, or plastic.
  • the cap 10 is fitted into a recess in a lower body member 20, which is provided with pipe threads 22 at the lower end thereof.
  • An axial passage 24 provides communication for fluid pressure to actuate the switch.
  • the body 20 is provided with a recess 26 for receiving a portion of cap member 10.
  • a diaphragm 30 is placed at the bottom of recess 26 and rests upon a shoulder 32.
  • the lower portion of cap 10 presses upon the diaphragm to position and hold it in place and make a fluidtight seal.
  • the bottom portion of cap 10 is secured by an overturned lip 34 of the body 20.
  • the outer surface of body 20 can be provided with a hexagonal section 36 for engagement by a wrench to facilitate installation or removal of the switch.
  • the interior of the body 20 is provided with a conical recess 40 below the diaphragm to limit the movement of the diaphragm.
  • the interior of cap member 10 is generally hollowed out and one portion of the interior provides a shoulder 42.
  • An axial recess 44 receives and positions a spring 46.
  • a movable contact arm 50 is secured to the inner end of electrode 14.
  • Contact arm 50 is provided with a double ended contact point 51.
  • Contact arm 50 is provided near its center with a dimple or depression 51 for receiving on one side the conical portion 54 of a piston 56, and on its other side one end of spring 46 to center and position the same.
  • a portion 53 may be cut away to impart greater flexibility to contact arm 50.
  • Upper and lower fixed contacts 60, 62, having contact points 64, 66, are secured to electrodes 12 and 16 respectively.
  • the switch is shown schematically as it would be installed in a motor vehicle.
  • a battery 70 grounded at 71, supplies voltage to an ignition switch 72 and to a vehicle starting motor 73.
  • contacts 74, 75 will be closed completing a circuit to contact 76, and this in turn completes a circuit to contact 77, which energizes a starting solenoid 78.
  • Current is passed by Way of contact 77 through wire 80 to contact 62, through movable contact 50, to a wire 81, which supplies electric current to the motor 82 of the electric fuel pump, thus causing the pump to deliver fuel to the carburetor of the engine.
  • the oil pump 84 of the engine When the engine is running, the oil pump 84 of the engine will deliver fluid pressure to the switch by way of a pipe 85, and will shift the electrical circuit by way of contact 50 to complete the circuit with contact 60 and Wire 92 to contact 76, and the fuel pump 82 will continue to run.
  • the ignition switch After the engine has started, the ignition switch will be turned to the normal running position, so that contacts 90, 91 complete a circuit to contact 76 and the fuel pump is thus able to continue running but the starter solenoid 78 is deenergized and the starting motor will cease to operate.
  • a low oil pressure warning light 93 such as is commonly used on modern automobiles. In the event of low oil pressure, or a stopped engine, contacts 51, 64 will open and battery current will pass through the lamp 93 to motor 82 and thence to ground. The high resistance of the lamp will limit current flow so that motor 82 will not run.
  • a fluid pressure actuated switch comprising (A) an upper housing of electrically nonconductive material,
  • the said normally open and normally closed con-- tacts being spaced apart a distance less than the length of travel of said piston whereby. a rolling and sliding motion is imparted to the surfaces of the contacts during movement of said piston from one position to another.
  • a fluid pressure actuated switch comprising (A) an upper housing of electrically nonconductive material,
  • each of said electrodes having means at their outer ends for securing an electrical conductor thereto and at their inner ends for securing one of said contacts thereto,
  • a first one of the said electrodes being located off-center to one side of the said upper housing and having the said movable contact secured thereto,
  • biasing means centrally disposed in said recess and secured from lateral movement therein, said biasing means being interposed between the bottom of said recess and an upper face of said movable contact, the said movable contact being further provided with locating means for said biasing means constituting a depression when viewed from the underside and a raised portion or dimple when viewed from the upper side thereof,
  • a fluid pressure actuated switch comprising (A) an upper housing of electrically nonconductive material,
  • each of said electrodes having means at their outer ends for securing an electrical conductor thereto and at their inner ends for securing one of the said contacts thereto,
  • a first one of the said electrodes being located off-center to one side of the said upper housing and having the said movable contact secured thereto,
  • biasing means centrally disposed in said recess and secured from lateral movement therein, said biasing means being interposed between the bottom of said recess and an upper face of said movable contact, the said movable contact being further provided with locating means for said biasing means constituting a depression which viewed from the underside and a raised portion or dimple when viewed from the upper side thereof,

Landscapes

  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
US474715A 1965-07-26 1965-07-26 Fluid pressure actuated switch Expired - Lifetime US3321594A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US474715A US3321594A (en) 1965-07-26 1965-07-26 Fluid pressure actuated switch
GB30321/66A GB1100999A (en) 1965-07-26 1966-07-06 Fluid pressure actuated switches
FR70474A FR1487572A (fr) 1965-07-26 1966-07-22 Interrupteur électrique actionné par la pression d'un fluide
DE19661590017D DE1590017B1 (de) 1965-07-26 1966-07-23 Fluessigkeitsdruckbetaetigter elektrischer Schalter
SE10122/66A SE338085B (en)) 1965-07-26 1966-07-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US474715A US3321594A (en) 1965-07-26 1965-07-26 Fluid pressure actuated switch

Publications (1)

Publication Number Publication Date
US3321594A true US3321594A (en) 1967-05-23

Family

ID=23884662

Family Applications (1)

Application Number Title Priority Date Filing Date
US474715A Expired - Lifetime US3321594A (en) 1965-07-26 1965-07-26 Fluid pressure actuated switch

Country Status (4)

Country Link
US (1) US3321594A (en))
DE (1) DE1590017B1 (en))
GB (1) GB1100999A (en))
SE (1) SE338085B (en))

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3529107A (en) * 1968-05-09 1970-09-15 Berg Mfg & Sales Co Double throw switch
US3939506A (en) * 1974-01-18 1976-02-24 Pearson Raymond H Odor control ventilator
US3942200A (en) * 1975-01-13 1976-03-09 Pearson Raymond H Odor control ventilator
US4250361A (en) * 1979-03-12 1981-02-10 The Echlin Manufacturing Company Pressure actuated switch with actuator having contact-actuating rib between piston and spring-guide portions
US4767897A (en) * 1987-11-03 1988-08-30 Chrysler Motors Corporation Conductor structure for transducer switch
US4778956A (en) * 1987-11-03 1988-10-18 Chrysler Motors Corporation Pressure transducer with switch
US4967047A (en) * 1989-01-09 1990-10-30 Acustar, Inc. Switch with post-assembly calibration access
US4982607A (en) * 1990-03-29 1991-01-08 Acustar, Inc. Composite cylinder for a mini oil pressure transducer
US5089675A (en) * 1990-03-29 1992-02-18 Acustar, Inc. Resistor card calibration retention method and fuel pump switch
US5144102A (en) * 1990-09-15 1992-09-01 Pierburg Gmbh Fluid pressure switch adapted for low fluid pressure and throughputs
CN112294292A (zh) * 2020-10-16 2021-02-02 深圳市盛景基因生物科技有限公司 一种智慧医疗家用生理信息采集装置

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2253629A (en) * 1936-05-15 1941-08-26 Electric Aute Lite Company Hydraulic switch
US2849242A (en) * 1955-01-31 1958-08-26 William D Allison Pressure control means for load compensator mechanism

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2466111A (en) * 1946-08-07 1949-04-05 Katcher Pressure operated switch for hydraulic brake systems
US2566545A (en) * 1950-03-31 1951-09-04 Sofronio B Alcoriza Brake fluid operated switch unit

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2253629A (en) * 1936-05-15 1941-08-26 Electric Aute Lite Company Hydraulic switch
US2849242A (en) * 1955-01-31 1958-08-26 William D Allison Pressure control means for load compensator mechanism

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3529107A (en) * 1968-05-09 1970-09-15 Berg Mfg & Sales Co Double throw switch
US3939506A (en) * 1974-01-18 1976-02-24 Pearson Raymond H Odor control ventilator
US3942200A (en) * 1975-01-13 1976-03-09 Pearson Raymond H Odor control ventilator
US4250361A (en) * 1979-03-12 1981-02-10 The Echlin Manufacturing Company Pressure actuated switch with actuator having contact-actuating rib between piston and spring-guide portions
US4767897A (en) * 1987-11-03 1988-08-30 Chrysler Motors Corporation Conductor structure for transducer switch
US4778956A (en) * 1987-11-03 1988-10-18 Chrysler Motors Corporation Pressure transducer with switch
US4967047A (en) * 1989-01-09 1990-10-30 Acustar, Inc. Switch with post-assembly calibration access
US4982607A (en) * 1990-03-29 1991-01-08 Acustar, Inc. Composite cylinder for a mini oil pressure transducer
US5089675A (en) * 1990-03-29 1992-02-18 Acustar, Inc. Resistor card calibration retention method and fuel pump switch
US5144102A (en) * 1990-09-15 1992-09-01 Pierburg Gmbh Fluid pressure switch adapted for low fluid pressure and throughputs
CN112294292A (zh) * 2020-10-16 2021-02-02 深圳市盛景基因生物科技有限公司 一种智慧医疗家用生理信息采集装置
CN112294292B (zh) * 2020-10-16 2022-05-31 深圳市盛景基因生物科技有限公司 一种智慧医疗家用生理信息采集装置

Also Published As

Publication number Publication date
GB1100999A (en) 1968-01-31
DE1590017B1 (de) 1971-02-25
SE338085B (en)) 1971-08-30

Similar Documents

Publication Publication Date Title
US3321594A (en) Fluid pressure actuated switch
US3758733A (en) Ric material and conductive particles therein pressure sensitive stepping switches with multi layer spring contact assembly with interposed layers of lubricated non-conductive elastome
US4037193A (en) Liquid level alarm apparatus for a tank of a vehicle
US3963887A (en) Pressure-responsive switch device for pneumatic tires
US3723684A (en) Pressure responsive switch with parallel contact blades bent apart by axial force applied by diaphragm
US4255630A (en) Multi-circuit electrical switch
US3372372A (en) Automobile deceleration signal switching circuit
US3209088A (en) Sliding contact window switch with resilient spring means for biasing contacts and centering actuator means
US2817727A (en) Electric switch
US2537354A (en) Oil pressure switch
US3310642A (en) Tail gate electric window and gate switch
US3525262A (en) Electric pressure gauge
US2520353A (en) Tire pressure alarm switch
US4074226A (en) Brake malfunction warning and indicating system for automobiles
US2663772A (en) Float switch
US5099092A (en) Position indicator assembly
US4091250A (en) Electro-mechanical liquid level sensor
GB1535436A (en) Electric switch for monitoring liquid level
KR850008547A (ko) 차량 유압시스템의 액면지시기
US2748218A (en) Fluid operated cyclic control for brake light circuits
US3792219A (en) Pushbutton switch with coil spring movable content wedgingly engageable with stationary housing contact
US3576413A (en) Washer fluid low level warning switch
US3859626A (en) Vehicle engine oil temperature pressure and metal detecting device
US3716682A (en) Turn signal switch
US3121145A (en) Fluid pressure operated switch