EP0268508A1 - Flachlastschalter mit Bimetall - Google Patents

Flachlastschalter mit Bimetall Download PDF

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Publication number
EP0268508A1
EP0268508A1 EP87402290A EP87402290A EP0268508A1 EP 0268508 A1 EP0268508 A1 EP 0268508A1 EP 87402290 A EP87402290 A EP 87402290A EP 87402290 A EP87402290 A EP 87402290A EP 0268508 A1 EP0268508 A1 EP 0268508A1
Authority
EP
European Patent Office
Prior art keywords
circuit breaker
breaker according
bimetallic
flat circuit
housing
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.)
Granted
Application number
EP87402290A
Other languages
English (en)
French (fr)
Other versions
EP0268508B1 (de
Inventor
Jacques Weber
Bertrand Torcheux
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.)
Dav Dite Ste
Dav SA
Original Assignee
Dav Dite Ste
Dav SA
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 Dav Dite Ste, Dav SA filed Critical Dav Dite Ste
Publication of EP0268508A1 publication Critical patent/EP0268508A1/de
Application granted granted Critical
Publication of EP0268508B1 publication Critical patent/EP0268508B1/de
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
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/04—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrothermal opening

Definitions

  • the present invention relates to a flat bimetallic circuit breaker and, more particularly to a flat circuit breaker whose bimetallic strip is blistering and usable in the automotive industry.
  • the movable part generally constituted by a pusher is moved between a contact of the bimetallic strip and a contact carried by a connection tab ensuring electrical continuity with the bimetallic strip so as to interrupt an electrical supply when the bimetallic strip deforms as a result of a rise in temperature developed in said bimetallic strip, by the Joule effect.
  • circuit breakers interpose a member between the fixed contact and the movable contact.
  • the need to cut the bimetallic strip following a special configuration not only involves very special tools but also to accept tolerances for manufacturing the bimetallic strip which are not very precise due to the nature of the metals used for the production of bimetallic strips.
  • the circuit breakers are not extremely flat due to the superposition of at least three elements, such circuit breakers being difficult to use on motor vehicles in which very little space is available in the electrical connection areas.
  • the present invention aims to remedy the aforementioned drawbacks and to propose a flat circuit breaker, extremely reliable and whose volume is reduced to the maximum.
  • An object of the present invention is a circuit breaker of the type comprising a housing in which are housed a bimetallic actuator with snap action, in the form of a dome and carrying a movable contact, a first cylindrical orifice being formed in the center of said dome; coplanar connection tongues and connected to said bimetallic actuator, one of said tongues carrying a fixed contact cooperating with the movable contact, and it is characterized in that the movable contact and the connection of the other connection tab with the bimetallic actuator are diametrically opposite along a diameter which is inclined relative to the median plane passing through the center of said bimetallic actuator and between the coplanar connection tongues.
  • the bimetallic actuator comprises a central cylindrical orifice, the dimensions of which determine the calibration of the circuit breaker, and two other small orifices, one of which cooperates with a lug mounted on a control pusher and maintaining the bimetallic actuator in position separated from electric opening of its contact relative to the fixed contact as long as a reset of said actuator has not occurred, while the other serves for the correct positioning, during assembly, of said actuator in the housing and in relation to the connection tabs.
  • the circuit breaker according to the invention represented in FIGS. 1 and 2 comprises a box 1 constituted by two parts 2 and 3, one, for example 2, serving to house the different elements of the circuit breaker, the other 3 being used as closing cover.
  • the connection of the two parts 2 and 3 is ensured by four pins 4 and 5 coming from molding with the part 2 and being introduced into corresponding orifices formed in the closing cover 3, of which only one 6 is shown in FIG. 2.
  • Two flat and coplanar connecting tongues 7 and 8 each have an orifice 9 into which a force-fitting pin 5 is fitted which, for this purpose, has a bevelled end allowing better introduction into the corresponding orifice 9 and an enlarged base 5a which prevents the connection tab from moving along the nipple.
  • Side projections 7a and 8a housed in grooves 10 and 11 formed in the bottom part 2 prevent said tongues from moving laterally or in the direction of a median plane of the circuit breaker materialized by the dashes 12; the connection tabs 7 and 8 are arranged symmetrically with respect to said median plane.
  • the tongue 7 is longer than the tongue 8 and has a configuration in two parallel planes located one above the other, so as to conform to the configuration of the housing 1 which is designed to occupy the most volume weak possible.
  • the tongue parts 13 and 14 located in different planes are connected by an inclined part 15.
  • the free ends 16 of the tongues 7 and 8 are bevelled so as to allow easy insertion into not shown receiving clips.
  • a bimetallic actuator 17 is constituted, FIGS. 3 and 4, by a curving blistering disc, so as to constitute what is commonly called a bimetal with snap action.
  • the bimetallic strip 17 is obtained from a disc of diameter equal to for example 17 mm which has been deformed into two spheres of different radii so as to obtain a central part 18 of radius R1 bordered by a crown 19 of radius R2 .
  • a cylindrical orifice 20 of which the diameter which varies from 0 to 10 mm makes it possible to calibrate the circuit breaker according to the operating intensities under which the circuit breaker must operate.
  • the bimetallic strip 17 is precalibrated in temperature and must withstand temperatures up to 140 ° C.
  • a material with zero expansion coefficient such as, for example, INVAR, which comprises 64% iron, 36% nickel. and from 0.25 to 0.30% chromium.
  • the external face 21 is an alloy with a high positive expansion coefficient, based on iron, nickel and manganese or iron, nickel and chromium.
  • a very weak layer of nickel or copper is interposed to adjust the resistivity of the bimetallic strip 17.
  • the bimetallic strip 17 which is shown in dotted lines in FIG. 1, comprises along the median plane 12, two small orifices 23 and 24, of small diameter, which can be indifferently formed on the central part 18, on the crown 19 or at the junction of these two parts and this, depending on the dimensions of said parts 18 and 19.
  • the orifice 23 is used to properly position the bimetallic strip 17 during its assembly in part 2 by means of an appropriate assembly tool not shown.
  • a movable contact 25 is provided on the internal face 22 of the bimetallic strip 17 and cooperates with a fixed contact 26 provided, opposite, on the tongue 7.
  • the tongue 8 is connected, for example a welding point 27.
  • the electrical continuity between the tongues 7 and 8 is provided by said contacts 25 and 26, the bimetallic strip 17 and the welding point 27.
  • the fixed contact 26 and the welding point 27 are aligned along a diameter of the bimetallic strip 17, inclined relative to the median plane 12, at an angle of 36 ° for example.
  • a reset button 28 is mounted in the bottom part 2 of the housing 1.
  • the enlarged head 29 is guided in a notch 30 formed in said part 2, while the push rod 31 which is flat, is guided by two lateral flanges 32 arranged above a groove 33 in which the push rod moves. In this way, the push rod 31 cannot come out of its guide groove other than by sliding. Any release perpendicular to the sliding direction is prevented by the flanges 32.
  • the end 34 of the push rod 31 is also bevelled. Two lugs 35 and 36 are each mounted symmetrically on one face of the push rod 31.
  • the lug 36 is capable of being received in the orifice 24 of the bimetallic strip to maintain the latter in a given position.
  • the lug 35 serves to support a branch 38 of a spring 37 in the form of a two-hairpin.
  • the spring 37 is arranged flat under the bimetallic strip 17, around a slight relief 40 and between two small flanges 41 and 42 provided above small openings 43 formed in the bottom part 2, the branch 39 of the spring passed under the rim 42 and resting on a small vertical wall 44.
  • the lug 35 is capable of moving in a rectangular opening 45 which is aligned with another rectangular opening 46 formed between the lateral flanges 32.
  • the different openings 43, 45 and 46 thus formed in the bottom wall 2 allow ventilation of the interior of the housing which avoids rashly raising the temperature inside the housing during the production of contact break sparks.
  • the housing comprises sectionable lateral fasteners 50 which connect the third boxes 1 to one another so as to allow mass production in the form of a string capable of being wound in a strip.
  • the bimetallic strip 17 When, by the passage of an electric current, the temperature of the bimetallic strip 17 reaches a predetermined value as a function of the calibration of the circuit breaker, the bimetallic strip 17 abruptly deforms in the direction opposite to the bulging of the central spherical cap, thus cutting the electrical connection between the contacts 25 and 26.
  • the movement of the bimetallic strip 17 has the effect of releasing the lug 35 and the pusher 28 is biased towards a position released by the action of the spring 37 which relaxes, thus maintaining the contacts 25, 26 open when the bimetallic strip cools, the bimetallic strip, after cooling, remaining in abutment on the lug 36.
  • the manual reset of the circuit breaker is carried out by depressing the pusher 28 in order to bring the lug 35 into the orifice 24 of the bimetallic strip.
  • the pusher 28 does not move between the contacts 25 and 26 and therefore does not touch the latter. It follows that the pusher cannot be deformed or worn by the sparks of rupture of the contacts 25 and 26. In addition, the contacts 25 and 26 are themselves protected and cannot be polluted by material which would slip between them.
  • connection between the short tongue 8 and the bimetallic strip 17 can be achieved by any suitable means on an appendage 50 of the bimetallic strip 17 so as to improve, if necessary, the current density in said bimetallic strip 17.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Fuses (AREA)
EP87402290A 1986-10-27 1987-10-14 Flachlastschalter mit Bimetall Expired - Lifetime EP0268508B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8614889 1986-10-27
FR8614889A FR2605798A1 (fr) 1986-10-27 1986-10-27 Disjoncteur plat a bilame

Publications (2)

Publication Number Publication Date
EP0268508A1 true EP0268508A1 (de) 1988-05-25
EP0268508B1 EP0268508B1 (de) 1992-05-06

Family

ID=9340220

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87402290A Expired - Lifetime EP0268508B1 (de) 1986-10-27 1987-10-14 Flachlastschalter mit Bimetall

Country Status (5)

Country Link
US (1) US4801913A (de)
EP (1) EP0268508B1 (de)
DE (1) DE3778835D1 (de)
ES (1) ES2031149T3 (de)
FR (1) FR2605798A1 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5742464A (en) * 1994-07-12 1998-04-21 Ceola; Giacomo Heat responsive power interrupting device
US6707368B2 (en) * 2001-07-18 2004-03-16 Cooper Technologies Company Manually trippable circuit breaker

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1189234A (fr) * 1959-02-26 1959-10-01 Prise de courant comportant un disjoncteur
US3311725A (en) * 1965-10-23 1967-03-28 Mechanical Products Inc Circuit breaker with lost motion lockout member for interposing between contacts
DE2720499A1 (de) * 1976-05-07 1977-11-24 Taylor John C Elektrischer schalter
DE2640181A1 (de) * 1976-09-07 1978-03-16 Hofsass P Elektrischer temperaturschutzschalter
DE3526785C1 (de) * 1985-07-26 1986-07-17 Ellenberger & Poensgen Gmbh, 8503 Altdorf Druckknopfbetaetigter UEberstromschutzschalter

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3342144A1 (de) * 1983-11-22 1985-05-30 Ellenberger & Poensgen Gmbh, 8503 Altdorf Druckknopfbetaetigter ueberstromschutzschalter
DE8522254U1 (de) * 1985-08-02 1985-09-26 Ellenberger & Poensgen Gmbh, 8503 Altdorf Überstromschutzschalter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1189234A (fr) * 1959-02-26 1959-10-01 Prise de courant comportant un disjoncteur
US3311725A (en) * 1965-10-23 1967-03-28 Mechanical Products Inc Circuit breaker with lost motion lockout member for interposing between contacts
DE2720499A1 (de) * 1976-05-07 1977-11-24 Taylor John C Elektrischer schalter
DE2640181A1 (de) * 1976-09-07 1978-03-16 Hofsass P Elektrischer temperaturschutzschalter
DE3526785C1 (de) * 1985-07-26 1986-07-17 Ellenberger & Poensgen Gmbh, 8503 Altdorf Druckknopfbetaetigter UEberstromschutzschalter

Also Published As

Publication number Publication date
FR2605798A1 (fr) 1988-04-29
EP0268508B1 (de) 1992-05-06
DE3778835D1 (de) 1992-06-11
ES2031149T3 (es) 1992-12-01
US4801913A (en) 1989-01-31

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