US2468774A - Electrical circuit breaker - Google Patents

Electrical circuit breaker Download PDF

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Publication number
US2468774A
US2468774A US732308A US73230847A US2468774A US 2468774 A US2468774 A US 2468774A US 732308 A US732308 A US 732308A US 73230847 A US73230847 A US 73230847A US 2468774 A US2468774 A US 2468774A
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US
United States
Prior art keywords
throw
rod
circuit
push button
electrical
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
US732308A
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English (en)
Inventor
Joseph F O'brien
John B Cataldo
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.)
John B Pierce Foundation
Original Assignee
John B Pierce Foundation
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 John B Pierce Foundation filed Critical John B Pierce Foundation
Priority to US732308A priority Critical patent/US2468774A/en
Priority to FR953256D priority patent/FR953256A/fr
Application granted granted Critical
Publication of US2468774A publication Critical patent/US2468774A/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
    • 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

Definitions

  • This invention relates to electrical circuit breakers for protecting electric circuits against overload, and constitutes an improvement on existing devices of the type.
  • l is a side elevation. of the device
  • Fig. 2 is a central vertical section, showing the circnit in. its normally closed condition
  • Fig. 3 is a corresponding View, out showing how the device operates to hreak the circuit overload
  • Fig. 5 is a similar View showing how the circuit is reclosed and the device re-set from its thrown positions of Figs, 3 and 4;
  • Fig. 6 is a transverse section taken on the line G--6, Fig. 2, somewhat reduced in size; and Fig. 7 is a similar transverse section taken on the line 'l2-T, Fig. 2.
  • the operative mechanism of the preferred form illustrated is, housed in a casing I0, advantageously molded from an insulating plastic in two complementary longitudinal sections held together by spring wire hoops II which snap into circumferential receiving grooves, see Fig. l.
  • a neck Illa, through which extends a manually controlled re-set push button I2 may be externally threaded as shown for convenient installation of the device in a panel or other supporting structure.
  • a disc I3 advantageously molded from an insulating plastic in two complementary longitudinal sections held together by spring wire hoops II which snap into circumferential receiving grooves, see Fig. l.
  • a neck Illa through which extends a manually controlled re-set push button I2 may be externally threaded as shown for convenient installation of the device in a panel or other supporting structure.
  • a disc I3 advantageously molded from an insulating plastic in two complementary longitudinal sections held together by spring wire hoops II which snap into circumferential receiving grooves, see Fig. l.
  • Fig. 2 of insulation serves to close the opposite end of the casing I0 and to carry the external electric terminals of the device.
  • the device is arranged to be connected across an electric load circuit in such manner as not to interfere lwith the normal functioning thereof except at such times as overload is manifest, whereupon the device acts to break the circuit so the excessive load will not be enough to cause damage.
  • the electric terminals I4 and I5 afford means for connecting the device in a load circuit to be protected from damage by electrical overload.
  • a throw-rod I1 is supported longitudinally by means of partition elements i8 and I9.
  • Such throw-rod I'I passes through the partition elements, having bearing therein for sliding movement.
  • end portion Ila of l such throw-rod is disposed within a corresponding receiving passage, which extends completely through the push button i 2, longitudinally thereof, said end stoppin-g short of the open outer end of the passage in the unthrown or norm mal position of the rod, see Fig. 2.
  • the rod is electrically conductive.
  • the opposite end of the throw-rod l1 is formed as an electrical Contact, preferably by having a disc lib of silver or other suitable material secured thereto.
  • the arm 2i is anchored, preferably to the partition element I8 which is of insulation.
  • the throw-rod Il is normally maintained in its unthrown or circuit closing position of Fig. 2 by means of a mechanical latching arrangement, and is forcibly thrown to its circuit-breaking pom sition of Figs. 3 and 4 by resilient means which become eiective upon the unlatchlng of the rod.
  • the resilient means advantageously taire the form of a spring disc 22, anchored circumferentially in the casing I0, and an auxiliary or booster coil spring 23.
  • the latter is disposed between the spring disc 22 and a circumferentially shouldered portion 24 formed intermediate the length of throw-rod I1, the spring disc thereby acting on the throw-rod through the intermediacy of the coil spring.
  • the mechanical latching arrangement here comprises a latch arm 25, pivoted at one end to the partition element I9 and extending longitudinally within the casing into the vicinity of partition element I8.
  • partition element I9 is advantageously apertured deeply from its periphery and provided with stub projections for receiving and journaling the opposite ear formations 25a, 25a of latch arm 25.
  • a latch linger 25h extends from latch arm 25, being advantageously an intermediate portion thereof which has been struck outwardly as shown. It lies in the vicinity of the shouldered maintained long portion 24 of throw-rod
  • a slightly curled bi-metal thermo element 21 encircled by an electric heating coil 28.
  • Such heating coil is electrically connected in series with the electric terminals I4 and I5, the series circuit including, however, the separable electrical contacts
  • the circuit comprises a wire 29 electrically connecting the terminal I4 to one end of the heating coil 28 through the intermediacy of a conductive stud 30 which passes through the partition element I8, a.
  • carrying the electrical contact 20 is held in normal position when the throw-rod I1 is thrown, so that contact 2U does not follow electrical contact
  • a rigid pin 34 preferably of electrical insulating material, which extends longitudinally within the casing I from the back flange I2a of push button I2 to abutment against the resilient arm 2
  • Push button I2 works against a return spring 35, and the rigid pin 34, as here illustrated, works against a return spring 36. Pressing of push button I2 following circuit-breaking action of the device changes the positions of the parts in the manner indicated by the differences between Figs. 4 and 5. That is to say, throw-rod I1 is pushed inwardly so that latching finger 25h snaps back into latching position under keeper flange 24a. At the same time, rigid pin 34 pushes resilient arm 2
  • the device has a trip-free action. That is to say, the circuit may be broken manually without disturbing the overload protectivc ⁇ mechanism.
  • the circuit may be opened, and it may be held open for as long a time as the push button is continued to be pressed, see Fig. 5. Release of the push button will, of course, result in re-closing the circuit.
  • throw means carrying an electric contact; movable supporting means carrying a second electric contact f or make and break with said first contact; latch means normally maintaining said throw means in fixed position relative to said supporting means so that the said contacts are closed; resilient means operative to actuate said throw means in a direction away from said second contact; thermostatic means responsive to electrical overload for positively tripping said latch means, said means being disposed in the electric circuit governed by said contacts, and being effective to release said latch means upon a given condition of electrical overload in said circuit; a push button associated with said throw means and serving as a limit stop therefor in its thrown position so that pressing of said push button will re-set said throw means in its normal latched position; and means mechanically connecting said push button with said movable supporting means so that pressing of the push button will move said second contact out of rangeof the first.
  • An electrical circuit breaker comprising a casing; a push button installed in said casing for manual operation exteriorly thereof; a throw-rod mounted for longitudinal movement within the casing, said throw-rod having one end slidably associated with said push button and a portion arranged as a limit stop for abutment against said push button in the thrown position; resilient means constantly urging said throw-rod towards the said limit position; latch means normally holding said throw-rod against the urge of said resilient means; an electrical contact carried by the other end of said throw-rod; a second electrical contact carried by movable supporting means, said second contact being in break relationship with said contact carried by the throwrod when said throw-rod is released by said latch means, and normally in make relationship with said contact when said throw-rod is held by said latch means; means responsive to electrical overload, said means being disposed in the electric circuit governed by said contacts, and being effective to release said latch means upon a given condition of electrical overload in said circuit; and means mechanically connecting said push button with said movable supporting means so that pressing of the push button will move

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US732308A 1947-03-04 1947-03-04 Electrical circuit breaker Expired - Lifetime US2468774A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US732308A US2468774A (en) 1947-03-04 1947-03-04 Electrical circuit breaker
FR953256D FR953256A (fr) 1947-03-04 1947-09-19 Perfectionnements apportés aux disjoncteurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US732308A US2468774A (en) 1947-03-04 1947-03-04 Electrical circuit breaker

Publications (1)

Publication Number Publication Date
US2468774A true US2468774A (en) 1949-05-03

Family

ID=24943024

Family Applications (1)

Application Number Title Priority Date Filing Date
US732308A Expired - Lifetime US2468774A (en) 1947-03-04 1947-03-04 Electrical circuit breaker

Country Status (2)

Country Link
US (1) US2468774A (fr)
FR (1) FR953256A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2838635A (en) * 1956-07-16 1958-06-10 Mechanical Products Inc Electric switch having automatic current overload protection
US3009999A (en) * 1958-06-24 1961-11-21 Arrow Hart & Hegeman Electric Tool handle switch with overload protection

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1766965A (en) * 1927-04-08 1930-06-24 Adolph A Thomas Thermostat
US2150635A (en) * 1936-07-22 1939-03-14 Emerson Electric Mfg Co Motor protector switch
US2325650A (en) * 1941-12-02 1943-08-03 Westinghouse Electric & Mfg Co Circuit breaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1766965A (en) * 1927-04-08 1930-06-24 Adolph A Thomas Thermostat
US2150635A (en) * 1936-07-22 1939-03-14 Emerson Electric Mfg Co Motor protector switch
US2325650A (en) * 1941-12-02 1943-08-03 Westinghouse Electric & Mfg Co Circuit breaker

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2838635A (en) * 1956-07-16 1958-06-10 Mechanical Products Inc Electric switch having automatic current overload protection
US3009999A (en) * 1958-06-24 1961-11-21 Arrow Hart & Hegeman Electric Tool handle switch with overload protection

Also Published As

Publication number Publication date
FR953256A (fr) 1949-12-02

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