US3641469A - Electric fuse - Google Patents

Electric fuse Download PDF

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Publication number
US3641469A
US3641469A US70853A US3641469DA US3641469A US 3641469 A US3641469 A US 3641469A US 70853 A US70853 A US 70853A US 3641469D A US3641469D A US 3641469DA US 3641469 A US3641469 A US 3641469A
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US
United States
Prior art keywords
receptacle
washer
resilient member
electrically conductive
electric
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
US70853A
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English (en)
Inventor
Luigi Pramaggiore
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US3641469A publication Critical patent/US3641469A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23Q—IGNITION; EXTINGUISHING-DEVICES
    • F23Q7/00—Incandescent ignition; Igniters using electrically-produced heat, e.g. lighters for cigarettes; Electrically-heated glowing plugs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling
    • H01H37/76—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material
    • H01H37/761—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit
    • H01H2037/762—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts
    • H01H2037/763—Contact member actuated by melting of fusible material, actuated due to burning of combustible material or due to explosion of explosive material with a fusible element forming part of the switched circuit using a spring for opening the circuit when the fusible element melts the spring being a blade spring

Definitions

  • ABSTRACT An electric fuse, especially for electric lighters in motor vehicles, comprising electrically conductive fusible means for releasing at a given temperature an electrically conductive metal plate to open the electric circuit and interrupt the supply of current.
  • This invention relates to an electric fuse, especially for electric lighters in motor vehicles.
  • an electric fuse which can be attached to the electric lighter and comprises electrically conductive fusible means for releasing at a given temperature an electrically conductive metal plate to open the electric circuit and interrupt the supply of current. In this way the supply of current can be automatically stopped when the resistor of the electric lighter remains continuously energized because of some misfunction of the electric lighter.
  • the essential or operative part of the fuse is mode of metal or an alloy which will melt at a low temperature, for example, a lead alloy, so that when the electric lighter is energized by the rated electric current of the circuit in which it is inserted, the operative part will not be noticeably heated whereas it will be overheated until it melts when the electric resistor is energized longer than a predetermined period whereby the circuit protected by the fuse is interrupted.
  • the fuse according to the invention may be applied, for example, to an electric lighter for motor vehicles of the type described in applicants Italian Pat. No. 570,238 of Apr. 19, 1957.
  • the fuse is mounted on the shaft projecting from the rear of the lighter where conventionally the terminal plate for connection to the electric feed cable is secured.
  • the fuse according to the invention comprises a supporting receptacle of insulating material accommodating a fusible element in the form of a washer while another metal washer and finally a nut hold the pack thus formed together on the rear shaft or pin of the lighter in the manner of a riveting.
  • a small blade projecting from a tombac leaf spring may be secured to establish electric connection between the current supply terminal plate and the resistor of the lighter so that when the thermal element melts due to heating produced by the heat coming from the lighter body, the leaf spring will be released and come out of the pack of the fuse to interrupt the electric circuit. Normally when the electric circuit is closed the leaf spring will be wound around the.
  • the fuse according to the invention ensures the interruption of the electric current supply when there is a short circuit or when the temperature in the lighter rises beyond a predetermined limit.
  • the fuse according to the invention may also be supplied to many other electric devices.
  • this fuse permits the regular passage of current as long as the device on which it is installed operates in the normal regular way, but it interrupts the supply of current in the case of a short circuit or defect of operation of the device to be protected, for example, as mentioned above, when the temperature rises above a certain value.
  • FIG. 1 is a transverse section of a fuse according to the invention, shown on an enlarged scale;
  • FIG. 2 is a front view of the fuse in the closed or inoperative position (with the circuit closed), and
  • FIG. 3 is a similar view showing the fuse in the open position when the device is detached (with the circuit open).
  • the fuse or device according to the invention essentially consists of a supporting receptacle 1 preferably made of fiber I glass and having incorporated therein and partly extending therefrom a brass terminal 4 for connection to thelelectric feed cable (not shown).
  • the portion of the terminal4 which is embedded in the receptacle 1 has a laterally projecting pointed lug 8 to which a steel spring 7 is secured and bent round.
  • the free end of the steel spring 7 carries a bronze blade 6 which serves for electric connection of the terminal 4 to the central pin of the lighter (not shown), this pin being electrically connected through a rivet 5 in the form of an eyelet with through hole to a fusible washer 3 of an electrically conductive lead alloy and a brass washer 2 for electric connection of the device.
  • the bronze blade 6 extends in a plane perpendicularly to the plane of the steel spring 7 and has a semicircular recess at its free end which facilitates the insertion of the bronze blade 6 between the fusible washer 3 and the brass washer 2 and ensures its close engagement on the shaft of the rivet 5.
  • the rivet 5 connects in the manner of a conventional riveting the supporting receptacle 1, the fusible washer 3 and the brass washer 2 so as to form a single block thereof.
  • the alloy of the fusible washer 3 is so chosen that the washer will melt at a given temperature determined by the temperature of fusion of the metal alloy employed.
  • the lower peripheral portion of the supporting receptacle 1 is provided with a semicircular outer surface.
  • An electric fuse for electric lighters in motor vehicles comprising a receptacle of insulating material for said electric lighter, an electrically conductive terminal projecting from said receptacle, a resilient member connected at one end to said terminal and carrying at its opposite end a contact blade; said resilient member having a first operative and a second inoperative position, and electrically conductive temperature responsive means insulatingly supported by said receptacle with respect to said terminal for maintaining said resilient member in said first position thereof at temperatures below a predetermined temperature and adapted to release said resilient member at temperatures above said predetermined temperature, and electrically conductive means for assembling as a unit said receptacle, said temperature responsive means and said resilient member in said first position thereof, said last-named means being adapted to engage a center projecting pin of a cigarette lighter.
  • a fuse according to claim 1, wherein said receptacle defines over at least a portion of its periphery a curved surface adapted to guide said resilient member into said first position thereof.
  • a fuse according to claim 2 wherein said resilient member comprises a steel spring and said contact blade at said opposite end of said member comprises a bronze blade located in said first position of said resilient member between said fusible washer and said end washer.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuses (AREA)
  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Lighters Containing Fuel (AREA)
  • Passenger Equipment (AREA)
US70853A 1970-04-11 1970-09-09 Electric fuse Expired - Lifetime US3641469A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT6823470 1970-04-11

Publications (1)

Publication Number Publication Date
US3641469A true US3641469A (en) 1972-02-08

Family

ID=11308605

Family Applications (1)

Application Number Title Priority Date Filing Date
US70853A Expired - Lifetime US3641469A (en) 1970-04-11 1970-09-09 Electric fuse

Country Status (11)

Country Link
US (1) US3641469A (de)
JP (1) JPS5146895B1 (de)
BE (1) BE756206A (de)
CA (1) CA920182A (de)
CH (1) CH514815A (de)
DE (1) DE2041063C3 (de)
ES (1) ES383782A1 (de)
FR (1) FR2092029B1 (de)
GB (1) GB1296566A (de)
SE (1) SE376510B (de)
YU (1) YU33998B (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016400A (en) * 1974-05-20 1977-04-05 Schoeller & Co. Elektrotechnische Fabrik Overheating safety device for electrical lighters
US4459464A (en) * 1981-10-13 1984-07-10 Kabushiki Kaisha Tokai Rika Denki Seisakusho Electric cigar lighter
US5173593A (en) * 1989-12-28 1992-12-22 Shin-Etxu Polymer Co., Ltd. Electric cigar lighter having a thermal safety fuse
US6324086B1 (en) * 2001-01-12 2001-11-27 Simon Hsieh Power source supplier usable in an automobile

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1055838B (it) * 1976-01-22 1982-01-11 Iao Industrie Riunite Spa Accendisigari elettrico per autoveicoli

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA668041A (en) * 1963-08-06 A. Dahlen Paul Fuse
US3323458A (en) * 1964-08-24 1967-06-06 Jr Henry W Hartmann Thermal fuze
FR1577002A (de) * 1967-03-21 1969-08-01

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2790049A (en) * 1955-07-11 1957-04-23 Mcgraw Electric Co Protectors for electric circuits

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA668041A (en) * 1963-08-06 A. Dahlen Paul Fuse
US3323458A (en) * 1964-08-24 1967-06-06 Jr Henry W Hartmann Thermal fuze
FR1577002A (de) * 1967-03-21 1969-08-01

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4016400A (en) * 1974-05-20 1977-04-05 Schoeller & Co. Elektrotechnische Fabrik Overheating safety device for electrical lighters
US4459464A (en) * 1981-10-13 1984-07-10 Kabushiki Kaisha Tokai Rika Denki Seisakusho Electric cigar lighter
US5173593A (en) * 1989-12-28 1992-12-22 Shin-Etxu Polymer Co., Ltd. Electric cigar lighter having a thermal safety fuse
US6324086B1 (en) * 2001-01-12 2001-11-27 Simon Hsieh Power source supplier usable in an automobile

Also Published As

Publication number Publication date
FR2092029B1 (de) 1975-01-10
CA920182A (en) 1973-01-30
DE2041063A1 (de) 1972-01-13
YU33998B (en) 1978-09-08
GB1296566A (de) 1972-11-15
SE376510B (de) 1975-05-26
DE2041063B2 (de) 1978-03-02
JPS5146895B1 (de) 1976-12-11
BE756206A (fr) 1971-03-01
ES383782A1 (es) 1973-03-01
CH514815A (it) 1971-10-31
DE2041063C3 (de) 1978-10-26
YU296770A (en) 1978-02-28
FR2092029A1 (de) 1971-01-21

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