US2895028A - Pushbutton-operated overload switch - Google Patents

Pushbutton-operated overload switch Download PDF

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Publication number
US2895028A
US2895028A US699952A US69995257A US2895028A US 2895028 A US2895028 A US 2895028A US 699952 A US699952 A US 699952A US 69995257 A US69995257 A US 69995257A US 2895028 A US2895028 A US 2895028A
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United States
Prior art keywords
switch
pushbutton
bridge
bimetallic strip
contact
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Expired - Lifetime
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US699952A
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English (en)
Inventor
Ellenberger Jakob
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Individual
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/48—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having both electrothermal and electromagnetic automatic release
    • H01H73/56—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having both electrothermal and electromagnetic automatic release reset by push-button, pull-knob or slide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/46—Automatic release mechanisms with or without manual release having means for operating auxiliary contacts additional to the main contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/58—Manual reset mechanisms which may be also used for manual release actuated by push-button, pull-knob, or slide
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H01H71/7436—Adjusting the position (or prestrain) of the bimetal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/22—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release
    • H01H73/30—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide
    • H01H73/306—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having electrothermal release and no other automatic release reset by push-button, pull-knob or slide the push-button supporting pivotally a combined contact-latch lever

Definitions

  • the present invention relates to a pushbutton-operated thermally released overload switch which is mounted in a housing of a considerably greater length than width.
  • this contact bridge is arrested in a fixed position in engagement with a control spring by means of a carrier member which is mounted on the control bridge and by a projecting portion on an angular part of the contact bridge;
  • This control spring is controlled by a thermal and/or magnetic release mechanism, and it may additionally be acted upon manually by a pushbutton.
  • the switch construction may according to the invention be further simplified by making the control spring in the form of a heated bimetallic strip which is preferably heated indirectly. If the switch is also to be provided with an electromagnetic release, the heating coil for this bimetallic strip may be connected in series with the winding of the electromagnet.
  • Another feature of the invention is to provide the switch with very simple means for adjusting the bimetallic strip to operating currents of diiferent strength.
  • These means consist of an adjusting screw with a conical tip which acts upon a projection on the bimetallic strip to vary the initial tension of the latter.
  • the bimetallic strip is provided with a detent which holds the contact bridge in the on position. This detent is preferably likewise conductive so that, when the switch operates, the circuit will also be broken at this point.
  • the bimetallic strip may also be provided with a second detent which is adapted to arrest the contact bridge in an intermediate position in which the angular portion thereof may engage with a projecting portion of the switch housing.
  • the control bridge is also provided with a pair of contacts which are operatively associated with other contacts on the base of the switch which, by means of terminal strips, may be connected to signaling circuits.
  • the new switch In the intermediate position, however, the new switch will not close any of the signaling circuits and it will also interrupt the main circuit.
  • the carrier member on the control bridge and the resilient contacts In this position, the carrier member on the control bridge and the resilient contacts will be electrically separated from each other by the control bridge and insulating bushings.
  • the bimetallic strip is preferably mounted at a point between the coil of the electromagnetic release mechanism and the contact bridge.
  • the armature of the magnet is provided with a slot into which an angular lever engages which, in turn, may be acted upon by a pushbutton for releasing the switch manually.
  • This slot arrangement permits the switch to be operated independently of the electromagnetic and thermal release.
  • the switch according to the invention is designed to fit into a narrow oblong housing which consists of two longitudinally separated parts and is provided with internal projections, recesses and webs which are associated with the switch parts to serve as abutments and guiding means therefor.
  • FIG. 1 illustrates a switch according to the invention in the off position with one part of the housing removed;
  • Fig. 2 illustrates a cross section taken along line IIII of Fig. 1, but with the entire housing;
  • Fig. 3 illustrates a view similar to Fig. 1, but with the switch in the on position
  • Fig. 4 illustrates another view similar to Fig. 1, but with the switch in the neutral position
  • Fig. 5 illustrates a cross section taken along line V-V of Fig. 4, but with both parts of the housing;
  • Fig. 6 illustrates a diagrammatic view of the switch connections in the on position
  • Fig. 7 illustrates a modification of the switch without an electromagnet; while Fig. 8 illustrates one of the two housing parts.
  • Figs. 1 to 6 illustrate the inventive concept as applied to an automatic switch which is mounted within a flat housing, and in which the release of the switching operation may be carried out either electromagnetically or thermally.
  • the housing of the switch consists of the two parts 1 and 2.
  • the upper portion 3 of the housing contains a pushbutton 4 with a skirt 5 which is slidably guided within a bore 6.
  • Pushbutton 4 carries integrally there with a control rod 7 which is surrounded by a coil spring 8 which tends to press pushbutton 4 outwardly to its off position.
  • a bridge member 9 of insulating material is connected to the lower end of control rod 7 with a carrier member 10 secured thereto which has on each side an upwardly projecting tab 11.
  • the upper edges 12 of tabs 11 pivotably support an angular lever having two arms 13 and 14. This lever has an inwardly extending projection 15 which, as illustrated in Fig, 1 may be engaged and taken along by member 10 when bridge member 9 is depressed.
  • the angular lever 13, 14 which forms a contact bridge is pressed upwardly by a coil spring 16 and has a contact point 17 which is operatively associated with another contact 18 on a terminal strip 19 leading to the outside of the housing.
  • Lever 13, 14 which is made of conductive material has another contact point 20 which, when the switch is in the on position, as illustrated in Fig. 3, engages with a detent 21 which is mounted on a latching member in the form of a bimetallic strip 22.
  • This bimetallic strip has another detent 53 which is adapted to engage with lever 13, 14 to hold the same in an intermediate position.
  • Bridge member 9 has mounted on its lower side contact springs 54 which are adapted to make contact either with the pair of contacts 23 or the pair of contacts 24, depending upon the position of bridge member 9. Contacts 23 and 24 are fixed on terminal strips 25 and 26, respectively, which also lead to the outside of the housing.
  • Bridge member 9 and contact springs 54- are separately insulated by bushings 49 and 50.
  • the bimetallic strip 22 further carries a heating coil 27 which, as illustrated in Fig. 6, is connected to a Winding 28 of an electromagnet 29.
  • Armature 30 of this magnet has in its upper end a slot 31 into which a laterally projecting lug 32 on an angular lever 33 engages which is pivotably mounted at 34.
  • Lever 33 has another lateral lug 48 which is adapted to be engaged by the release button 35.
  • Lever 33 is connected to bimetallic strip 22 in such a manner that, when this lever is rocked about the pivot at 34 by depressing the release button 35, the bimetallic strip will be similarly disengaged from the levers 13 and 14 as it will be if heated by its heating coil 27.
  • the bimetallic strip 22 may thus be actuated not only by the core of the magnet or the flexing of the bimetallic strip 22 under thermal action but also by the release button 35.
  • the bimetallic strip is further provided with a laterally projecting lug 36 upon which the conical tip 37 of a set-screw 38 is adapted to act which is mounted at 3:9 and may be adjusted from the outside of the housing to vary the initial tension of the bimetallic strip.
  • Winding 28 of electromagnet 29 is connected to a terminal strip 4t) leading to the outside, and is connected in series with the heating coil 27 of bimetallic strip 22 and with contact lever 13, 14.
  • Terminal strips 25 and 26 are adapted to be connected to signalling means, for example, lamps.
  • Fig. 7 differs from that shown in Figs. l to 6 merely by the omission of the electromagnetic release means 28, 29 and 30.
  • Detent 21 will then slide off contact point 20. Under the action of the two springs 8 and 16, bridge member 9 will then move upwardly to the position shown in Fig. 1.
  • Contact lever 13, 14 will pivot about the rock points 12 to the position shown in Fig. l, and the upper arm 13 will engage the inclined surface 41 of the housing.
  • the two contacts 17 and 18 will then be likewise disengaged so that the circuit will be broken at two places.
  • the switch is further provided with a neutral position in which none of the contacts are closed.
  • This position is illustrated in Fig. 4, in which the contact 17 of the lever 13, 14 will engage a projection 43 on the housing, while contact portion 20 will be arrested by the detent 53 on bimetallic spring 22.
  • the bridging contact springs 54 will then be disposed at a point between contacts 23 and 24 so that none of the signal circuits is closed.
  • the switch can be brought from the off position, shown in Figure l, to the neutral position, illustrated in Figure 4, by depressing the pushbutton 4 to such extent that the top of the skirt 5 is aligned with the upper end of the bore 6.
  • lever system 13, 14 is taken along by the carrier member 10, engaging the top end of projection 15 forming part of this lever system 13, 14, as shown in Figure 1.
  • the lever 13 has arrived at about the position shown in Figure 4-, its contact point 29 has passed the detent 53, so that upon release of the partially depressed pushbutton 4, the spring 8 tends to move this pushbutton 4 upwards.
  • the contact point 20 on the lever 13 is provided with an inclined side 44-, adapted to slide along the opposite surfaces on the detents 53 and 21 when the pushbutton 4- is depressed.
  • the switch will release when actuated by overloads or short circuits, even if the pushbutton 4 should be jammed in its depressed or on-position ( Figure 3), due to a mechanical deficiency, or while manually held in such position.
  • An overload switch having a trip-free release comprising a.housing, switch elements provided within said housing and comprising a contact bridge having an angulararm thereon, a control rod, a pushbutton connected to one end of said control rod for moving said switch to the on position, a bridge member rigidly secured to the other end of said control rod, said bridge member having a projection thereon, said contact bridge being freely pivotable on said projection and being slidable along said control rod in the axial direction thereof, a carrier member mounted on said bridge member, a latching member, a projection on said angular arm of said contact bridge, said carrier member being adapted to engage said last projection when said bridge member is moved together with said control rod and pushbutton to move said contact bridge into engagement with said latching member, at least one automatic overload actuated releasing means connected to said latching member for varying the position thereof so as to disengage said latching member from said contact bridge and thereby to move said switch to the oflf position, and a
  • An overload switch as defined in claim '2 wherein said bimetallic strip has a projection thereon, and an adjusting screw having a conical tip engaging with said projection for adjusting the tension of said strip in accordance with the strength of an electric current to be controlled by said switch.
  • An overload switch as defined in claim 2 further comprising a detent on said bimetallic strip adapted to engage with said contact bridge to maintain said contact bridge in the on position.
  • An overload switch as defined in claim 2 further comprising a pair of resilient contacts on said bridge member, a pair of stationary contacts, a second pair of stationary contacts, each pair of said stationary contacts being adapted to be connected to different signaling means, said contacts on said bridge member being adapted to engage with one pair of said stationary contacts when said switch is in the on position and to engage with the other pair of stationary contacts when said switch is in the off position.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
  • Push-Button Switches (AREA)
US699952A 1958-02-27 1957-12-02 Pushbutton-operated overload switch Expired - Lifetime US2895028A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1958E0015424 DE1072717B (de) 1958-02-27 1958-02-27 Druckknopfbetätigter Überstromschalter

Publications (1)

Publication Number Publication Date
US2895028A true US2895028A (en) 1959-07-14

Family

ID=7069028

Family Applications (2)

Application Number Title Priority Date Filing Date
US699952A Expired - Lifetime US2895028A (en) 1958-02-27 1957-12-02 Pushbutton-operated overload switch
US795006A Expired - Lifetime US2952757A (en) 1958-02-27 1959-02-24 Pushbutton-operated overload switch

Family Applications After (1)

Application Number Title Priority Date Filing Date
US795006A Expired - Lifetime US2952757A (en) 1958-02-27 1959-02-24 Pushbutton-operated overload switch

Country Status (6)

Country Link
US (2) US2895028A (xx)
CH (2) CH359196A (xx)
DE (2) DE1051951B (xx)
FR (2) FR1185835A (xx)
GB (2) GB828754A (xx)
NL (2) NL106254C (xx)

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031542A (en) * 1959-10-26 1962-04-24 Ellenberger & Poensgen Pushbutton operated overload switch
US3075058A (en) * 1959-12-17 1963-01-22 Ite Circuit Breaker Ltd Push-push circuit breaker
US3143617A (en) * 1960-03-23 1964-08-04 Ellenberger & Poensgen Overload circuit breaker for high currents
US3185793A (en) * 1961-07-21 1965-05-25 Ellenberger & Poensgen Pushbutton operated overload circuit breaker
US3211862A (en) * 1962-04-28 1965-10-12 Ellenberger & Poensgen Pushbutton-controlled polyphase overload circuit breaker
US3268688A (en) * 1963-10-26 1966-08-23 Ellenberger & Poensgen Pushbutton-controlled overload circuit breaker
US3307122A (en) * 1964-06-30 1967-02-28 Ellenberger & Poensgen High-speed pushbutton-controlled overload circuit breaker
US3324429A (en) * 1965-06-02 1967-06-06 Ellenberger & Poensgen Pushbutton-controlled overload circuit breaker
US3365682A (en) * 1965-08-31 1968-01-23 Fujita Teizo Hand resettable trip-free electric circuit breaker
US3470507A (en) * 1966-11-05 1969-09-30 Square D Co Earth-leakage sensing circuit breaker
US3675177A (en) * 1969-10-27 1972-07-04 Ellenberger & Poenigen Gmbh Safety switch
US3794945A (en) * 1971-10-25 1974-02-26 Merlin Gerin Automatic tripping electro-magnetic contactor
US3938065A (en) * 1973-07-31 1976-02-10 Ellenberger & Poensgen Gmbh Push-button operated bipolar faulty current protective switch
US5757254A (en) * 1995-11-01 1998-05-26 Nitto Electric Works, Ltd. Earth leakage breaker
US20190103242A1 (en) * 2016-03-22 2019-04-04 Eaton Intelligent Power Limited Circuit breaker

Families Citing this family (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3087146A (en) * 1959-10-26 1963-04-23 Boudouris Angelo Signaling system employing a remotely controlled switch
NL257709A (xx) * 1959-11-09
US3217125A (en) * 1961-06-07 1965-11-09 Wood Electric Corp Circuit breaker having a cam means for very rapid opening of the contacts
US3240903A (en) * 1961-11-15 1966-03-15 Westinghouse Electric Corp Circuit interrupter with thermal trip means
US3211861A (en) * 1961-11-15 1965-10-12 Westinghouse Electric Corp Circuit interrupter having an improved tripping mechanism with an adjusting structure that cooperates with a bimetal to enhance tripping movement
DE1463121B2 (de) * 1964-06-30 1970-09-17 Ellenberger & Poensgen Gmbh, 8503 Altdorf Druckknopfbetätigter Oberstromschalter für hohe Nennströme mit thermischer und elektromagnetischer Auslösung
US3408606A (en) * 1966-06-10 1968-10-29 Ite Circuit Breaker Ltd Low ampere circuit breaker with indirectly heated thermal element
CH499871A (de) * 1968-11-07 1970-11-30 Ellenberger & Poensgen Thermischer Schalter
US3629763A (en) * 1970-01-27 1971-12-21 Mechanical Products Inc Circuit breaker
US3673531A (en) * 1970-08-13 1972-06-27 Design & Mfg Corp Electrically released latching switch for timer-controlled appliances and the like
US3680014A (en) * 1971-01-19 1972-07-25 Heinemann Electric Co Circuit breaker with an improved actuating mechanism
US3873955A (en) * 1971-01-25 1975-03-25 Frederick T Bauer Electrical switch for primary control system for furnaces
BE793833A (fr) * 1972-01-14 1973-05-02 Telemecanique Electrique Dispositif d'armement et de declenchement pour relais thermique
DE2511223C2 (de) * 1975-01-23 1978-02-09 Ellenberger & Poensgen Gmbh, 8503 Altdorf Druckknopfbetätigter Überstromschalter mit thermischer Auslösung
US4080582A (en) * 1976-09-15 1978-03-21 Cutler-Hammer, Inc. Circuit breaker with improved trip mechanism
DE7704459U1 (de) * 1977-02-15 1977-06-02 Ellenberger & Poensgen Gmbh, 8503 Altdorf Druckknopfbetätigter bimetallgesteuerter UberstromschaHer mit Freiauslösung
FR2530072B1 (fr) * 1982-07-07 1985-12-20 Cgae Satelem Dispositif commutateur, notamment disjoncteur du type a enclenchement par enfoncement puis relachement d'un bouton-poussoir et a declenchement par la deformation d'une lame bimetallique
DE3242062A1 (de) * 1982-11-13 1984-05-17 Brown, Boveri & Cie Ag, 6800 Mannheim Elektrischer schalter
DE3313465A1 (de) * 1983-04-14 1984-10-18 Ellenberger & Poensgen Gmbh, 8503 Altdorf Druckknopfbetaetigter ueberstromschalter
DE8530597U1 (de) * 1985-10-29 1986-02-27 Ellenberger & Poensgen Gmbh, 8503 Altdorf Überstromschutzschalter
US4816429A (en) * 1986-08-25 1989-03-28 Murata Manufacturing Co., Ltd. Temperature compensating dielectric ceramic composition

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2409917A (en) * 1943-02-26 1946-10-22 Gen Electric Circuit breaker
US2443090A (en) * 1945-08-04 1948-06-08 Donald R Wise Circuit breaker
US2633515A (en) * 1951-10-29 1953-03-31 Zinsco Electrical Products Thermally actuated automatic overload circuit breaker
US2741681A (en) * 1951-03-27 1956-04-10 Allard Georges Electrical circuit-breakers

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE934235C (de) * 1944-12-13 1955-10-13 Siemens Ag Reihenselbstschalter
US2476648A (en) * 1945-06-04 1949-07-19 Square D Co Circuit breaker
AT177825B (de) * 1950-05-10 1954-03-10 Ellenberger & Poensgen Thermischer Überstromschalter
US2563175A (en) * 1950-10-03 1951-08-07 Julia Kitman Thermal circuit breaker
AT172874B (de) * 1951-06-20 1952-10-25 Wenzel Letfuss Sicherungsautomat
US2797276A (en) * 1952-02-06 1957-06-25 Labinal Ets Automatic circuit breakers
FR1105604A (fr) * 1954-05-31 1955-12-06 Interrupteur électrique perfectionné
US2863022A (en) * 1955-04-20 1958-12-02 Gen Electric Circuit breaker
US2816192A (en) * 1956-09-05 1957-12-10 Mechanical Products Inc Electric switch incorporating an automatic circuit breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2409917A (en) * 1943-02-26 1946-10-22 Gen Electric Circuit breaker
US2443090A (en) * 1945-08-04 1948-06-08 Donald R Wise Circuit breaker
US2741681A (en) * 1951-03-27 1956-04-10 Allard Georges Electrical circuit-breakers
US2633515A (en) * 1951-10-29 1953-03-31 Zinsco Electrical Products Thermally actuated automatic overload circuit breaker

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3031542A (en) * 1959-10-26 1962-04-24 Ellenberger & Poensgen Pushbutton operated overload switch
US3075058A (en) * 1959-12-17 1963-01-22 Ite Circuit Breaker Ltd Push-push circuit breaker
US3143617A (en) * 1960-03-23 1964-08-04 Ellenberger & Poensgen Overload circuit breaker for high currents
US3185793A (en) * 1961-07-21 1965-05-25 Ellenberger & Poensgen Pushbutton operated overload circuit breaker
US3211862A (en) * 1962-04-28 1965-10-12 Ellenberger & Poensgen Pushbutton-controlled polyphase overload circuit breaker
US3268688A (en) * 1963-10-26 1966-08-23 Ellenberger & Poensgen Pushbutton-controlled overload circuit breaker
US3307122A (en) * 1964-06-30 1967-02-28 Ellenberger & Poensgen High-speed pushbutton-controlled overload circuit breaker
US3324429A (en) * 1965-06-02 1967-06-06 Ellenberger & Poensgen Pushbutton-controlled overload circuit breaker
US3365682A (en) * 1965-08-31 1968-01-23 Fujita Teizo Hand resettable trip-free electric circuit breaker
US3470507A (en) * 1966-11-05 1969-09-30 Square D Co Earth-leakage sensing circuit breaker
US3675177A (en) * 1969-10-27 1972-07-04 Ellenberger & Poenigen Gmbh Safety switch
US3794945A (en) * 1971-10-25 1974-02-26 Merlin Gerin Automatic tripping electro-magnetic contactor
US3938065A (en) * 1973-07-31 1976-02-10 Ellenberger & Poensgen Gmbh Push-button operated bipolar faulty current protective switch
US5757254A (en) * 1995-11-01 1998-05-26 Nitto Electric Works, Ltd. Earth leakage breaker
US20190103242A1 (en) * 2016-03-22 2019-04-04 Eaton Intelligent Power Limited Circuit breaker
US10818462B2 (en) * 2016-03-22 2020-10-27 Eaton Intelligent Power Limited Circuit breaker

Also Published As

Publication number Publication date
NL295713A (xx) 1965-05-10
CH370471A (de) 1963-07-15
US2952757A (en) 1960-09-13
CH359196A (de) 1961-12-31
GB866733A (en) 1961-04-26
FR1185835A (fr) 1959-08-06
DE1072717B (de) 1960-01-07
NL106254C (xx) 1963-10-15
DE1051951B (de) 1959-03-05
NL121180C (xx) 1966-09-15
FR74972E (fr) 1961-03-03
GB828754A (en) 1960-02-24

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