US3739314A - Heat responsive switching devices - Google Patents

Heat responsive switching devices Download PDF

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Publication number
US3739314A
US3739314A US00181473A US3739314DA US3739314A US 3739314 A US3739314 A US 3739314A US 00181473 A US00181473 A US 00181473A US 3739314D A US3739314D A US 3739314DA US 3739314 A US3739314 A US 3739314A
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US
United States
Prior art keywords
wire
resistor
circuit
contact
windscreen
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
US00181473A
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English (en)
Inventor
P Rouvre
F Peroy
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Renault SA
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Renault SA
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Filing date
Publication date
Application filed by Renault SA filed Critical Renault SA
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Publication of US3739314A publication Critical patent/US3739314A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60S—SERVICING, CLEANING, REPAIRING, SUPPORTING, LIFTING, OR MANOEUVRING OF VEHICLES, NOT OTHERWISE PROVIDED FOR
    • B60S1/00—Cleaning of vehicles
    • B60S1/02—Cleaning windscreens, windows or optical devices
    • B60S1/46—Cleaning windscreens, windows or optical devices using liquid; Windscreen washers
    • B60S1/48—Liquid supply therefor
    • B60S1/481—Liquid supply therefor the operation of at least part of the liquid supply being controlled by electric means
    • B60S1/482—Liquid supply therefor the operation of at least part of the liquid supply being controlled by electric means combined with the operation of windscreen wipers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H61/00—Electrothermal relays
    • H01H61/06—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts
    • H01H61/08—Self-interrupters, i.e. with periodic or other repetitive opening and closing of contacts wherein the make-to-break ratio is varied by hand setting or current strength

Definitions

  • This thermal switching device is intended for switching a circuit with different time periods for the opening and closing thereof and is characterized in that it consists of a conducting wire having a relatively substantial coefficient of thermal elongation, said wire being connected at one end to a switch and at the other end to one end of a flexible blade carrying at this end a contact adapted to engage another contact connected via a first resistor to ground and at the other end through a second resistor of considerably greater value than the first resistor to ground, said blade further comprising a link actuating a movable blade contact adapted to open or close through a switch the circuit to be switched.
  • This type of device is applicable notably but not exclusively to combined control circuits of windscreen washers and windscreen wipers of automotive vehicles.
  • the deviceconstituting the subject-matter thereof comprises a conducting heating wire having a relatively substantial coefficient of thermal elongation, which is connectedat one end to a switch and at the other end to one end of a flexible blade carrying at the same end a contact adapted to engage another contact connected via a first resistor to a return conductor (ground), the other end of this blade being connected via another resistor of considerably higher resistance value than said first resistor to a return conductor, said blade further comprising a levercontrolling a movable arm adapted through.
  • FIG. 1 is a diagrammatic view showing the basic principle of' the device; a I FIG. 2 is a section showing a specific form of embodiment of the device of FIG. 1, and
  • FIG. 3 illustrates the wiring diagram in which the'device of this invention is incorporated in a windscreen washer and windscreen wiper control system.
  • the device of this invention comprises a so-called. heating wire" or resistive wire 1 having one end connected to a fixed point of a circuit 1 and the other end. connected to one end of a flexible blade having its opposite end grounded through a relatively high resistance resistor 2.
  • the end of blade 5 attached tothe heating wire 1 carries a contact 3 adapted to engage an-- other contact 4 grounded through another resistorl2 having a lower resistance than resistor 2.
  • Blade 5 carries a link 6 also visible in FIG. 2, which is made of non-electroconductive material. The function of this link 6 is to provide a mechanical coupling between the flexible blade 5 and a lever 7.
  • This lever 7 comprises a fixed point at one end and engages with its other end a rolling spring 8 having two stable positions.
  • This spring 8 actuates in turn a contact-bearing lever 9 adapted torock between the pair of contacts 10, 11 of a switch inserted in a circuit II.
  • FIG. 3 illustrates diagrammaticallythe circuit of an assembly A comprising a windscreen wiper having a permanent-magnet motor adapted" to be stopped in anunvariableposition' also referred to as the fixed position, a windscreen wiper switch B, a windscreen washer pump C, and a timing device D adapted toextend the operating time of the windscreen wiper subsequent-to. the operation of the windscreen washer pump.
  • terminals'2'2" and'23" connected to the high and low speed contact studs 24' and 25, respectively, of switch B.
  • This switch B comprises, in addition to contact studs 24'and 25, a contact'stud 26 connectedto the positive terminal-of thesource of current and a contact stud'27 connected to'the'lever'7.
  • a sliding contact 28' permits connectingthe high-speed contact studs 24' and2 6 to thelow-speedcontact studs 25 and 26, or ZSand 27 (OFF position).
  • the time-lag device D comprises the abovedescribed component elements, namely the heating 3;. and a conductor 31 connectingthe terminal 32 of said pu'mp'to the heating wire 1.
  • the circuit is closed, the windscreen washer pump motor is energized, the time-lag blade 5 remains expanded and the windscreen wiper motor continues to operatepWhen the push-button 30 is released, the pump is stopped, the heating wire 1 being deenergized is cooled by the surrounding atmosphere and therefore contracts slowly during a predetermined time period.
  • the complete assembly is thus ready to start another cycle of operation which is obtained by depressing again pushbutton 30, and this can be done without waiting for the windscreen wiper motor to resume its inoperative position.
  • a thermal switching device for switching a circuit with different opening and closing time periods, characterizedin that it comprises a heating wire having a relatively substantial thermal elongation coet'ficient, said wire having one end connected to a switch and the other end connected to one end of a flexible blade carrying at this end a contact adapted to engage another contact connected in turn via a first resistor to a return or ground conductor, said flexible blade having its other end connected via another resistor of substantially greater value than said first resistor to a return or ground conductor, said blade being also associated with a link controlling the position of a movable lever adapted to open or close the circuit to be switched through a snap-action contact.
  • the thermal switching device set forth in claim 1, characterized in that the heating wire is connected to the energizing circuit of the windscreen washer motor so as to be energized simultaneously therewith, the windscreen wiper motor circuit being controlled through the movable link actuated as a consequence of the elongation of the heated wire, said first resistor causing the rapid heating of said wire and a rapid actuation of said windscreen wiper motor, the second resistor keeping the wire in its elongated condition, the cooling of said wire by the surrounding atmosphere causing the windscreen wiper to resume its inoperative condition after a longer time period.

Landscapes

  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Mechanical Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
  • Control Of Direct Current Motors (AREA)
  • Motor And Converter Starters (AREA)
  • Thermally Actuated Switches (AREA)
US00181473A 1970-09-23 1971-09-17 Heat responsive switching devices Expired - Lifetime US3739314A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7034460A FR2106758A5 (enExample) 1970-09-23 1970-09-23

Publications (1)

Publication Number Publication Date
US3739314A true US3739314A (en) 1973-06-12

Family

ID=9061735

Family Applications (1)

Application Number Title Priority Date Filing Date
US00181473A Expired - Lifetime US3739314A (en) 1970-09-23 1971-09-17 Heat responsive switching devices

Country Status (3)

Country Link
US (1) US3739314A (enExample)
FR (1) FR2106758A5 (enExample)
GB (1) GB1350798A (enExample)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872415A (en) * 1973-04-16 1975-03-18 Texas Instruments Inc Relay

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB703308A (en) * 1951-07-13 1954-02-03 Gen Motors Corp Improved temperature responsive electric switch
US3166655A (en) * 1959-12-21 1965-01-19 Herbert J Kline Hot wire regulated mechanical movements

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB703308A (en) * 1951-07-13 1954-02-03 Gen Motors Corp Improved temperature responsive electric switch
US3166655A (en) * 1959-12-21 1965-01-19 Herbert J Kline Hot wire regulated mechanical movements

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3872415A (en) * 1973-04-16 1975-03-18 Texas Instruments Inc Relay

Also Published As

Publication number Publication date
GB1350798A (en) 1974-04-24
DE2147193A1 (de) 1972-03-30
DE2147193B2 (de) 1975-09-04
FR2106758A5 (enExample) 1972-05-05

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