US3758733A - Ric material and conductive particles therein pressure sensitive stepping switches with multi layer spring contact assembly with interposed layers of lubricated non-conductive elastome - Google Patents

Ric material and conductive particles therein pressure sensitive stepping switches with multi layer spring contact assembly with interposed layers of lubricated non-conductive elastome Download PDF

Info

Publication number
US3758733A
US3758733A US00185957A US3758733DA US3758733A US 3758733 A US3758733 A US 3758733A US 00185957 A US00185957 A US 00185957A US 3758733D A US3758733D A US 3758733DA US 3758733 A US3758733 A US 3758733A
Authority
US
United States
Prior art keywords
pads
conductive
set forth
construction set
stack
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
US00185957A
Other languages
English (en)
Inventor
G Durocher
D Durocher
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.)
Mobil Oil AS
Lear Corp EEDS and Interiors
Original Assignee
Essex International 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 Essex International Inc filed Critical Essex International Inc
Application granted granted Critical
Publication of US3758733A publication Critical patent/US3758733A/en
Assigned to MOBIL OIL CORPORATION reassignment MOBIL OIL CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: NOWLIN, THOMAS E.
Assigned to UNITED TECHNOLOGIES AUTOMOTIVES, INC., A CORP. OF DE reassignment UNITED TECHNOLOGIES AUTOMOTIVES, INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: ESSEX GROUP, INC.
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
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/36—Contacts characterised by the manner in which co-operating contacts engage by sliding
    • H01H1/40—Contact mounted so that its contact-making surface is flush with adjoining insulation
    • H01H1/403—Contacts forming part of a printed circuit
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material
    • H01H1/029—Composite material comprising conducting material dispersed in an elastic support or binding material
    • 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

Definitions

  • a pressure sensitive stepping switch comprises a stack F'lcd: 1971 of resiliently compressible, normally non-conductive [2] APPL 1 5 957 elastomeric pads throughout each of which a quantity of electrically conductive particles are dispersed.
  • each pad is a pair of conductors for connec-
  • the pads are rendered elec- IIIL CI. ny conductive in response to compression of the [58] Field of Search 200/86.5, 166 C, Stack the compressive force required to render each 200,166 153 L3, 83 159 81 82 pad conductive being different so as to enable the pads 82 83 J to be rendered conductive in a predetermined sei quence.
  • This invention relates to pressure sensitive stepping switches of the kind adapted to effect sequential operation of a plurality of electrical devices in response to the application of a progressively increasing force.
  • the switches may be converted from conductive condition to non-conductive condition, eithersimultaneously or sequentially.
  • a vehicle may have a plurality of direction signaling lamps which are flashed sequentially to signal the vehicle driver's intention to make a turn.
  • the switching mechanisms heretofore provided for such sequential direction signal devices have required a considerable number of movable switching parts, relays, flashers, and associated electrical components, thereby resulting in a complex and expensive assembly.
  • a pressure sender device for an automotive vehicles oil pressure gauge Such a gauge conventionally utilizes an electrically operable indicator which is responsive to changes in oil pressure to indicate whether the oil pressure is high, low, or in a safe operating range.
  • a pressure sender device conventionally has a wire wound resistor to vary the current in the circuit of the gauges indicator so as to affect the position of the gauge indicator.
  • Pressure gauges of this kind in use heretofore have utilized fairly expensive and somewhat fragile mechanisms such as wire wound rheostats, pivots, torsion return springs, and the like, which, although enabling the gauge to be operative within rather wide tolerances, have presented objectionable assembly and maintenance problems.
  • An object of this invention is to provide a stepping switch for operating in predetermined sequence a plurality of electrical devices and which overcomes the disadvantages of previously known switches for similar purposes.
  • Another object of the invention is to provide a stepping switch construction having a plurality of on-off switching members composed of resiliently compressible pads convertible from conductive to nonconductive condition, andvice versa, solely in response to the applying and relieving of compressive force.
  • a further object of the invention is to provide resiliently compressible stepping switches of the character referred to and wherein the sensitivity of the switches may be varied within wide limits and in a number of different ways.
  • Another object of the invention is to provide a resiliently compressible on-off switch provided with a lubricant which greatly increases the electrical life of I the switch.
  • a further object of the invention is to provide a stepping switch of the character described and which itself is capable of handling large current loads, thereby avoiding the necessity of using relays and the like.
  • Another object of the invention is to provide a stepping switch for a vehicles signaling system and which avoids the necessity for the use of flashers.
  • FIG. 1 is a schematic diagram of a sequential direction signaling circuit for an automotive vehicle and in which stepping switches constructed according to the invention are included;
  • FIG. 2 is a side elevational view of an oil pressure sender assembly incorporating a stepping switch constructed in accordance with the invention
  • FIG. 3 is a vertical sectional view of the sender and taken on the line 3-3 of FIG. 4;
  • FIG. 4 is a transverse sectional view taken on the line 4-4 of FIG. 3;
  • FIG. 5 is a side elevational view of a part of the sender
  • FIG. 6 is an enlarged, plan view of a three-element .resistor incorporated in the sender assembly.
  • FIG, 7 is a schematic wiring diagram of a typical oil pressure gauge and sender circuit.
  • the circuit illustrated in FIG. 1 constitutes a combined sequential direction signaling circuit, a hazard warning circuit, and a stop warning circuit adapted for use on a motor vehicle having three right-rear lamps l, 2, and 3, a right-front lamp 4, three left-rear lamps 5, 6, and 7, and a left-front lamp 8'.
  • a direction signal operating switch 9 of conventional construction includes a movable right turn bridging contact 10 which in the inactive position of the operator 9 bridges a pair of fixed contacts 11 and 12 and which, when moved left to the dotted line position, bridges three fixed contacts 11, 13, and M.
  • the switch operator 9 also includes a movable left turn bridging contact 15 which, in the inactive position of the operator, bridges fixed contacts 16 and 17 and which, when moved to the dotted line position, bridges fixed contacts 13, I7, and 18.
  • the contact 13 is connected by a wire 19 to the positive terminal of a battery (not shown) or other source of electrical potential;
  • the contacts 11 and 17 are connected by wires 20 and 21 to the positive terminal of the source through a normally open brake pedal operated switch 22.
  • the contact 12 is connected'by a wire 23 to the filament lead 240i the lamp 1.
  • Wires 25 and 26 connected to the wire 23 also connect the terminal 12 to filament wires 27a and 28, respectively, of the lamps 2 and 3.
  • a diode 27 is interposed between the contact 12 and each of the lamp filament wires to prevent current flow in a direction from the lamps toward the contact 12.
  • the contact I6 is connected by a wire 28 to the filament wire 29 of the lamp 5.
  • Wires 3t) and 31 also connect the wire 28 to the filament wires 32 and 33, respectively, of the lamps 6 and 7.
  • Diodes 34 are interposed between the contact I6 and the filament wires of the lamps 5, 6 and 7 to prevent the flow of current in a direction from the lamps toward the contact 16.
  • the fixed contact 14 is connected by a wire 35 to a terminal 36 to which four additional wires 37, 38, 39, and 40 also are connected.
  • the fixed contact 18 is connected by a wire 41 to a terminal 42 to which four additional wires 43, 44, 45 and 46 also are connected.
  • the contacts 14 and 18 are connected to a common terminal 47 by means of wires 48 and 49, respectively, in each of which is a diode 50, the diodes permitting current flow from the contacts 14 and 18 in a direction only toward the terminal 47.
  • To the terminal 47 is connected one end of a conductor 51, the other end of which is connected to the winding of an electric motor 52 having a rotatable shaft 53 indicated by the dash line.
  • a hazard warning switch 54 has two terminals 55 and 56 connected by wires 57 and 58, respectively, to the contacts 14 and 18.
  • the switch 54 has a first movable contact 59 that is adapted to bridge the terminals 55 and- 56, and a second movable contact 60 that is adapted to engage a fixed terminal 61 which is connected by a wire 62 to the line 19.
  • the contacts 59 and 60 are joined by a conductor 63.
  • the construction and arrangement of the hazard warning switch 54 and its associated parts are such that, when the switch 54 is moved from its normally open position, as shown in FIG. 1, to its closed position, the motor 52 is energized from the power source via the line 62, either of the wires 57 and 58, and the conductor 51 so as to effect rotation of the motor shaft 53, for a purpose presently to be explained.
  • the construction and arrangement of the direction signal operating switch 9 and its associated parts are such that, when either of the movable contacts or is moved from its normally inactive position, as shown in full lines in FIG. 1, to an operative position, as shown in dotted lines, the motor 53 will be energized via the line 19, the contact 13, the associated contact 10 or 15, the appropriate wire 48 or 49, and theconductor 51.
  • the motor shaft 53 thus will be rotated for a purpose hereinafter to be explained.
  • a stepping switch 64 constructed in accordance with the invention, and comprising four independent, resiliently compressible pads 65, 66, 67,v and 68 arranged in a stack.
  • On opposite sides of the pad 65 is a pair of conductive plates 69 and 70, on opposite sides of the pad 66 is a pair of conductive plates 71 and 72, on opposite sides of the pad 67 is a pair of conductive plates 73 and 74, and on opposite sides of the pad 68 is a pair of conductive plates 75 and 76.
  • an insulator 78 Between the plates 70 and 71 is an insulator 78, between the plates 72 and 73 is an insulator 79, and between the plates 74 and 75 is an insulator 80.
  • the component parts of the switch are supported in a suitable tubular container (not shown) which is secured in a convenient manner to a fixed support 77.
  • the plate 69 is connected to the filament wire 24 of the lamp 1, the plate 70 is connected to the wire 37, the plate 71 is connected to the filament wire 27a of the lamp 2, the plate 72 is connected to the wire 38, the plate 73 is connected to the filament wire 28 of the lamp 3, the plate 74 is connected to the wire 39, the plate 75 is connected to the wire 40, and the plate 76 is connected to the filament wire 81 of the lamp 4.
  • a switch 64a which is identical in all respects to the switch 64, and corresponding parts are identified by the same reference characters, followed by the suffix a.
  • the motor shaft 53 mounts a cam 82 having a pair of similar lobes or risers 83 spaced apart from one another by a pair of dwell areas 84.
  • the cam 82 is mounted between the two switches 64 and 64a and in such manner that rotation of the cam causes the lobes 83 to bear against the plates 69 and 69a so as simultaneously to subject the pads of each stack to progressively increasing compressive forces.
  • the lobes and dwells of the cam are so shaped that the compressive force exerted by the cam on the switches 64 and 64a is relieved substantially instantaneously following maximum compression of the pads.
  • each switch preferably are formed of an electrically non-conductive, resiliently compressible, elastomeric material such as silicone rubber'and throughout which a plurality of electrically conductive particles are dispersed.
  • the particles preferably are spherical and are composed of a base metal such as copper or the like, coated with a noble metal such as silver which, upon oxidation, forms an electrically conductive oxide.
  • the size and quantity of the particles contained in each pad may vary, as sub sequently will be explained, but the size and quantity of the particles contained in each pad should be such that, when the pad is in an uncompressed state, the particles do not form a conductive path through the pad.
  • the size and quantity of particles contained therein should be such that a sufficient number thereof move into engagement so as to establish a conductive path through the pad and permit current to flow from one conductive plate through the pad to the other.
  • the size of the particles will vary according to the current load which must be carried. Generally, particle sizes ranging from 0.005 to 0.045 inch in diameter will accommodate automotive vehicle current values.
  • the sensitivity of any one of the pads in a stack may be varied in any one of a number of ways.
  • the compressibility and hence the sensitivity of a pad is inversely proportional to the density and the area of the elastomeric material.
  • the sensitivity of a pad also depends on its thickness and the quantity of conductive particles it contains. Thus, if two pads of different thickness contain the same number of particles, the thicker pad will be less sensitive than the thinner pad because the thicker pad must be compressed. to a greater degree before it can be rendered conductive.
  • a pad containing a larger number of particles, or particles of a smaller size than the number and size of particles of an otherwise identical pad will be rendered conductive under less compressive force than the other pad.
  • the most sensitive pad may have particles of approximately 0.005 inch in diameter and constituting about 85 90 weight percent of the pad.
  • the least sensitive pad may have particles of about 0.045 inch in diameter and constituting about 75 weight percent of the pad.
  • the size and quantity of particles in the other pads should be so selected that the sensitivities of such other pads are between those of the most and least sensitive pads.
  • the right-rear lamp 1 is located at the inboard side of the vehicle, the right-rear lamp 3 is located at the outboard side of the vehicle, and the rear lamp 2 is located between the lamps l and 3.
  • the lamp 4 is located at the right front of the vehicle. If the lamps 1, 2, and 3 are to signal a right-hand turn, therefore, the lamp 1 should be illuminated first, the lamp 2 illuminated second, and the lamp 3 illuminated third.
  • the right front lamp 4 may be illuminated to indicate a right hand turn without regard to the sequence of the illumination of the lamps ll, 2 and 3.
  • the pad 65 should be rendered conductive first, the pad 66 should be rendered conductive second, the pad 67 should be rendered conductive third, and the pads 65 and 66 should remain conductive at least until the pad 67 is rendered conductive.
  • the pad 65 thus should be the most pressure sensitive, the pad 67 should be the least pressure sensitive and the sensitivity of the pad 66 should be between those of the pads 65 and 67.
  • the sensitivity of the pad 68 may correspond to the sensitivity of any of the other pads.
  • the sensitivity of the pads 65a, 66a, 67a and 68a should correspond to the sensitivities of the pads 65, 66, 67, and 68, respectively.
  • the direction switch operator 9 is adjusted so as to shift the movable contact 10 from the full line position shown in FIG. 1 to the dotted line position.
  • the motor 52 thus will be energized so as to impart rotation to the cam 82.
  • one of the lobes 83 will engage the plate 69 and subject the entire stack of pads to compression.
  • the compressive force exerted on the stack of pads increases progressively as the cam rotates so as to render the pads 65, 66, and 67 conductive in succession and effect sequential illumination of the lamps l,
  • the lamp 4 also will be illuminated via the pad 68. Inasmuch as the compressive force applied by the cam to the stack of pads in the switch 64 increases progressively, any pad rendered conductive will remain conductive until the compressive force is relieved.
  • the cam 82 is so located that it engages both of the switches 64, 64a simultaneously. Since movement of the movable contact 10 to the right turn indicating position has no effect on the position of the movable contact 15, however, compression of the stack of pads in the switch 64a by the cam 82 has no effect on the lamps 5-8. it will be understood, however, that movement of the switch operator 9 to the left turn indicating position will effect movement of the contact 15 to the dotted line position shown in FIG. 1 so as to enable the signaling lamps 5-8 to be flashed.
  • the motor 52 will be started so as to drive the cam 82. Under these conditions compression of the pads in the switches 64 and 64a will cause both the left-hand and the right-hand sets of signaling lamps to be flashed simultaneously, thereby providing a warning signal which is different from the turn indicating signal.
  • the embodiment of the invention illustrated in FlGS. 2 7 comprises an oil pressure sender or transmitter T for internal combustion engines and comprises a hollow, metallic housing having a top wall 91 and a depending ski'rt 92.
  • the housing accommodates a base 93 formed of insulating material and which is maintained in'assembled relation with the housing by crimping the skirt beneath the base.
  • an annular insulating and sealing gasket 89 and an electrical resistor 94 having three resistance segments 95, 96 and 97 connected in series.
  • a flexible arm 98 terminating at its free end in a disc-like terminal 99.
  • a tap arm 100 like the arm 98, and a similar arm 1101 is interposed between the confronting ends of the resistances 95 and 97.
  • the arm 106 terminates in a disc-like terminal 102 and the arm 101 has a similar terminal 103.
  • a disc-like terminal 104 connected at 105 to a terminal 106 that extends through the base 93.
  • the resistive element 97 is connected to a grounded bushing 107 which extends through the base 93 and engages the metallic skirt 92 of the housing.
  • the arrangment is such that a current path extends from the terminal 106 to the terminal 104 and thence successively through each of the resistive elements 95, 96 and 97 to the grounded bushing 1107.
  • any one, or all, of the resistive segments may be by-passed, however, by bridging selected ones of the taps.
  • a nipple 109 Fixed to the top wall 91 of the housing 90, and extending through an opening 108 in the wall is a nipple 109 that is adapted to be fitted into an opening formed in a pressurized fluid system such as the oil distribution system of an internal combustion engine.
  • the nipple has a passageway 110 extending inwardly from the outer end thereof and which communicates with an internal bore 1 11 within which is mounted a resilient piston 112.
  • the piston is fitted on and carried by a stem 113 projecting from one end of a ram or plunger 114 which extends into the housing 90 and terminates at its other end in a presser disc 115.
  • the disc is slidably accommodated in and guided by a cylindrical socket 116 carried by the base 93, the socket having three axially extending slots 117 spaced uniformly from one another.
  • a pressure sensitive switch 118 constructed according to the invention is fitted into the socket 116 and comprises three independent, resiliently compressible pads 119, 120, and 121, similar to the pads of the switches 64, 64a previously described.
  • the resistor 94 is so arranged on the base 93 that the terminal 104 lies at the bottom of the guide socket 116 and in faceto-face engagement with the lowermost pad 119.
  • the tap arms 98, 100 and 102 extend through the adjacent slots 117 in the guide.
  • the tap arm 98 is reversely turned so as to locate its terminal 99 between the pads 119 and 120.
  • the arm 101 is reversely turned so as to locate its terminal 103 between the pads 120 and 121.
  • the arm 100 is reversely turned so as to locate its terminal 102 between the pad 121 and the presser disc 115 of the plunger.
  • Each of the pads 119 121 normally is nonconductive and each pad has a different pressure sensitivity so that a greater compressive force must be applied to one pad than to any other so as to render it conductive. Of the other two pads, one requires the application of less pressure than the other to render it conductive.
  • the pad 119 may be rendered conductive when subjected to a pressure of 6 psi
  • the pad 120 may be rendered conductive when subjected to a pressure of 30 psi
  • the pad 121 may be rendered conductive when subjected to a pressure of 60 psi.
  • the sensitivities of the respective pads may be adjusted, however, in any one of the several ways previously discussed.
  • the pressure transmitter T is adapted to be incorporated in the circuit of a conventional oil pressure gauge 125 having an oscillatable needle 126 operable to indicate a low, normal, or high pressure.
  • the position of the needle is determined by a bimetallic member the temperature of which is controlled, by a resistance heater 127.
  • the circuit includes a source of electrical potential such as a battery 13 which is connected to the heater 127 via a contact of a vehicle's ignition switch 128, a current limiting resistor 129, a choke coil 130, and a constant voltage regulator 131.
  • the heater 127 is connected to the terminal 106 and thence to the terminal 107 via the resistor 94.
  • the switches 119, 120, and 121 are connected in parallel with the resistor 94 so that selected ones of the resistive elements 95, 96,
  • gauge circuits and 97 may be inserted in or removed from the gauge circuit.
  • fluid under pressure may enter the passageway and act on the piston 112 so as to displace the ram 114, thereby subjecting the stacked pads of the switch 1 18 to progressively increasing pressure proportional to that in the system. If the pressure of the fluid is relatively low, such as would be the case if the engine is not operating, none of the switch pads will be compressed an amount sufflcient to render it conductive. Thus, the total resistance of the resistor 94 will be in the gauge circuit so as to cause the indicator needle to show no pressure.
  • the pressure of the oil should be sufficiently high to cause displacement of the ram 114 an amount sufficient to render the switch pads 119 and 120 conductive, thereby effecting bridging of all three of the conductive heads 99, 100 and 103 so as to remove the resistance segments 95 and 96 from the gauge circuit and permit the indicator to reflect normal oil pressure.
  • the ram 114 will compress the stacked switch pads an amount sufficient to render the third pad 121 conductive, thereby removing the third resistance 97 from the indicator circuit and enabling the indicator to reflect a high oil pressure.
  • the ram 114 will exert progressively less compressive force on the stacked switch pads so as to enable only the pad 119 to be conductive. In this instance, the two resistances 96 and 97 will be in the gauge circuit, thereby causing the indicator to reflect a lowpressure.
  • the longevity of the switch 118 may be improved by providing a small quantity of a lubricant, such as machine oil, at the interface between each pad and its conductive head.
  • a lubricant such as machine oil
  • a switch construction comprising a stack of individual pads each of which is formed of an electrically non-conductive, resilient elastomer having electrically conductive particles dispersed therethrough, each of said pads being responsive to compression thereof to establish an electrically conductive path therethrough; an electrical conductor on opposite sides of each of said pads; and means for applying on and longitudinally through said stack of pads a compressive force of such magnitude as to render a selected number of said pads electrically conductive.
  • Current control apparatus comprising a body formed of electrically non-conductive elastomeric material throughout which electrically conductive particles are dispersed in such quantity as to establish an electrically conductive path through said body, and a lubricant other than said material and said particles at least on the outer surface of said body.
  • Apparatus for operating in sequence a plurality of electrical devices comprising a stack of resilient, electrically non-conductive pads each of which has a sufficient quantity of electrically conductive particles therein to render it electrically conductive in response to the application of a predetermined compressive force on said pad; means for connecting each of said pads in circuit with a different electrical device and with a source of electrical energy; and operating means for subjecting opposite ends of said stack of pads to a compressive force of such magnitude as to render one after another of said pads electrically conductive and to maintain conductive each pad rendered conductive until all of said pads are rendered conductive.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Composite Materials (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Switches Operated By Changes In Physical Conditions (AREA)
  • Measuring Fluid Pressure (AREA)
  • Lighting Device Outwards From Vehicle And Optical Signal (AREA)
  • Push-Button Switches (AREA)
US00185957A 1971-10-04 1971-10-04 Ric material and conductive particles therein pressure sensitive stepping switches with multi layer spring contact assembly with interposed layers of lubricated non-conductive elastome Expired - Lifetime US3758733A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US18595771A 1971-10-04 1971-10-04

Publications (1)

Publication Number Publication Date
US3758733A true US3758733A (en) 1973-09-11

Family

ID=22683085

Family Applications (1)

Application Number Title Priority Date Filing Date
US00185957A Expired - Lifetime US3758733A (en) 1971-10-04 1971-10-04 Ric material and conductive particles therein pressure sensitive stepping switches with multi layer spring contact assembly with interposed layers of lubricated non-conductive elastome

Country Status (7)

Country Link
US (1) US3758733A (enrdf_load_stackoverflow)
JP (1) JPS5112822B2 (enrdf_load_stackoverflow)
CA (1) CA968836A (enrdf_load_stackoverflow)
DE (1) DE2248635C3 (enrdf_load_stackoverflow)
FR (1) FR2156039B1 (enrdf_load_stackoverflow)
GB (1) GB1375939A (enrdf_load_stackoverflow)
IT (1) IT974649B (enrdf_load_stackoverflow)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873795A (en) * 1973-04-28 1975-03-25 Lucas Electrical Co Ltd Electrical switch with reciprocating cam
US3879586A (en) * 1973-10-31 1975-04-22 Essex International Inc Tactile keyboard switch assembly with metallic or elastomeric type conductive contacts on diaphragm support
US3944766A (en) * 1974-07-03 1976-03-16 Essex International, Inc. Seat belt buckle having pushbutton type switch with elastomeric conductor bridging contact
US3952173A (en) * 1973-11-09 1976-04-20 Kabushiki Kaisha Tokai Rika Denki Seisakusho Switching apparatus
US3959610A (en) * 1974-12-13 1976-05-25 Motorola, Inc. Hermetically sealed keyboard type assembly with elastomeric electrical connecting link between switch and component modules
US3979570A (en) * 1973-05-16 1976-09-07 Kabushiki Kaisha Tokai Rika Denki Seisakusho Switching apparatus
US4055735A (en) * 1975-10-23 1977-10-25 Honeywell Information Systems Inc. Touch sensitive device
US4079269A (en) * 1975-04-22 1978-03-14 Fuji Photo Optical Co., Ltd. Switch means for cameras
FR2470435A1 (fr) * 1979-11-26 1981-05-29 Eventoff Franklin Dispositif electrique sensible a la pression, notamment pour commutateur d'instrument de musique
US4551594A (en) * 1983-06-20 1985-11-05 Honda Giken Kogyo Kabushiki Kaisha Oil pressure switch
US4795869A (en) * 1987-09-01 1989-01-03 S&C Electric Company Contact assembly for high-voltage switch
US4801925A (en) * 1987-02-02 1989-01-31 Davis Albert F Alarm transmission system and circuit interception switch
US20030010612A1 (en) * 2001-06-26 2003-01-16 Matsushita Electric Works, Ltd. Sliding switch with lubricant and method for manufacturing the same
US7768366B1 (en) 2007-10-29 2010-08-03 The United States Of America As Represented By The Secretary Of The Air Force Nanoparticles and corona enhanced MEMS switch apparatus
US20120160645A1 (en) * 2009-07-07 2012-06-28 Eltek S.P.A. Switch for vehicles

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51118554U (enrdf_load_stackoverflow) * 1975-03-20 1976-09-25
JPS558178Y2 (enrdf_load_stackoverflow) * 1976-11-15 1980-02-23
JPS6113520A (ja) * 1984-06-27 1986-01-21 松下冷機株式会社 圧力スイツチ
WO1992015109A2 (de) * 1991-02-15 1992-09-03 Niessen Guenther Steuerung, anordnung von teilchen und steuerungsvorrichtung, zu durchschaltzwecken, zu steuerzwecken, anordnung von teilchen mit zwei oder mehr zuständen, nicht-leitend und leitend, bzw. wenig leitend und stark leitend, bzw. undurchlässig und in einer ebene durchlässig, oder normal nicht-leitend, aber bei einwirkung einer k

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR577386A (fr) * 1923-04-17 1924-09-04 Forges Ateliers Const Electr Résistance électrique pouvant varier d'une façon progressive
DE1103077B (de) * 1959-12-08 1961-03-23 Daimler Benz Ag Anzeigevorrichtung fuer den OEldruck in Brennkraftmaschinen

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3873795A (en) * 1973-04-28 1975-03-25 Lucas Electrical Co Ltd Electrical switch with reciprocating cam
US3979570A (en) * 1973-05-16 1976-09-07 Kabushiki Kaisha Tokai Rika Denki Seisakusho Switching apparatus
US3879586A (en) * 1973-10-31 1975-04-22 Essex International Inc Tactile keyboard switch assembly with metallic or elastomeric type conductive contacts on diaphragm support
US3952173A (en) * 1973-11-09 1976-04-20 Kabushiki Kaisha Tokai Rika Denki Seisakusho Switching apparatus
US3944766A (en) * 1974-07-03 1976-03-16 Essex International, Inc. Seat belt buckle having pushbutton type switch with elastomeric conductor bridging contact
US3959610A (en) * 1974-12-13 1976-05-25 Motorola, Inc. Hermetically sealed keyboard type assembly with elastomeric electrical connecting link between switch and component modules
US4079269A (en) * 1975-04-22 1978-03-14 Fuji Photo Optical Co., Ltd. Switch means for cameras
US4055735A (en) * 1975-10-23 1977-10-25 Honeywell Information Systems Inc. Touch sensitive device
FR2470435A1 (fr) * 1979-11-26 1981-05-29 Eventoff Franklin Dispositif electrique sensible a la pression, notamment pour commutateur d'instrument de musique
US4551594A (en) * 1983-06-20 1985-11-05 Honda Giken Kogyo Kabushiki Kaisha Oil pressure switch
US4801925A (en) * 1987-02-02 1989-01-31 Davis Albert F Alarm transmission system and circuit interception switch
US4795869A (en) * 1987-09-01 1989-01-03 S&C Electric Company Contact assembly for high-voltage switch
US20030010612A1 (en) * 2001-06-26 2003-01-16 Matsushita Electric Works, Ltd. Sliding switch with lubricant and method for manufacturing the same
US6894235B2 (en) * 2001-06-26 2005-05-17 Matsushita Electric Works, Ltd. Sliding switch with lubricant and method for manufacturing the same
US7768366B1 (en) 2007-10-29 2010-08-03 The United States Of America As Represented By The Secretary Of The Air Force Nanoparticles and corona enhanced MEMS switch apparatus
US20120160645A1 (en) * 2009-07-07 2012-06-28 Eltek S.P.A. Switch for vehicles

Also Published As

Publication number Publication date
JPS4872669A (enrdf_load_stackoverflow) 1973-10-01
IT974649B (it) 1974-07-10
CA968836A (en) 1975-06-03
GB1375939A (en) 1974-12-04
DE2248635A1 (de) 1973-04-12
JPS5112822B2 (enrdf_load_stackoverflow) 1976-04-22
DE2248635C3 (de) 1975-09-04
FR2156039A1 (enrdf_load_stackoverflow) 1973-05-25
FR2156039B1 (enrdf_load_stackoverflow) 1975-10-24
DE2248635B2 (de) 1975-01-16

Similar Documents

Publication Publication Date Title
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
US4295699A (en) Pressure sensitive combination switch and circuit breaker construction
EP0322422A1 (en) Pressure checked electrical pressure switch
US4639710A (en) Foot pedal for varying resistance in an electrical circuit
US2275556A (en) Switch
US4648277A (en) Pressure responsive assembly
US3321594A (en) Fluid pressure actuated switch
US4449113A (en) Oil pressure sender with friction free resistor device
GB2078005A (en) Warning light illumination apparatus
US4127839A (en) Thermal switch
US2837609A (en) Electric switch
ES202652U (es) Interruptor electrico.
US3979570A (en) Switching apparatus
US4048455A (en) Pressure switch with plural axes pivoted conduction plate
US3431371A (en) Multiple position reciprocating switch construction
US3784941A (en) Relay construction
US4623868A (en) Variable electrical resistance device
US3735310A (en) Temperature responsive electrical switch assembly
US2506208A (en) Switch
US3562466A (en) Make-and-break composite electrical contacts
US4727263A (en) Electromotive setting device
US3511955A (en) Combined indicating lamp and pushbutton switch unit
US1405537A (en) Electric switch
SU1372205A1 (ru) Сигнализатор давлени
US3440647A (en) Two-terminal indicator light having spring-biased terminals

Legal Events

Date Code Title Description
AS Assignment

Owner name: MOBIL OIL CORPORATION,VIRGINIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NOWLIN, THOMAS E.;REEL/FRAME:004870/0785

Effective date: 19880418

Owner name: MOBIL OIL CORPORATION, A CORP. OF NEW YORK

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:NOWLIN, THOMAS E.;REEL/FRAME:004870/0785

Effective date: 19880418

AS Assignment

Owner name: UNITED TECHNOLOGIES AUTOMOTIVES, INC., A CORP. OF

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:ESSEX GROUP, INC.;REEL/FRAME:004933/0578

Effective date: 19880223