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US3930213A - Manually operable circuit interrupter with automatic current overload protection - Google Patents

Manually operable circuit interrupter with automatic current overload protection Download PDF

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Publication number
US3930213A
US3930213A US513371A US51337174A US3930213A US 3930213 A US3930213 A US 3930213A US 513371 A US513371 A US 513371A US 51337174 A US51337174 A US 51337174A US 3930213 A US3930213 A US 3930213A
Authority
US
United States
Prior art keywords
lever
latch
latch lever
arm
retainer
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
US513371A
Other languages
English (en)
Inventor
Edward L Richards
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.)
CBS Corp
Original Assignee
Westinghouse Electric Corp
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 Westinghouse Electric Corp filed Critical Westinghouse Electric Corp
Priority to US513371A priority Critical patent/US3930213A/en
Priority to ZA00756056A priority patent/ZA756056B/xx
Priority to CA236,436A priority patent/CA1044288A/en
Priority to GB39744/75A priority patent/GB1515749A/en
Priority to BR7506495*A priority patent/BR7506495A/pt
Application granted granted Critical
Publication of US3930213A publication Critical patent/US3930213A/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
    • 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
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/522—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
    • H01H71/525—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism comprising a toggle between cradle and contact arm and mechanism spring acting between handle and toggle knee
    • 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
    • H01H71/505—Latching devices between operating and release mechanism
    • H01H2071/508—Latching devices between operating and release mechanism with serial latches, e.g. primary latch latched by secondary latch for requiring a smaller trip force
    • 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
    • H01H71/505—Latching devices between operating and release mechanism
    • 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
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts

Definitions

  • the switch further comprises a pivoted latch lever operatively connected to the releasable arm to retain the arm in the latched condition, or for effecting unlatching of the arm, a latch retainer lever to retain the latch lever in the latch position said retainer lever is operatively connected to the trip plate of the overload relay to effect unlatching of the latch lever and releasable arm in response to an overload current.
  • the retainer lever is spring-biased to the latch position with the latch lever and the retainer lever comprising an extension engageable with the latch lever when the latter is in the unlatched position to maintain the latch lever in a relatching position.
  • a circuit interrupter with adjustable overload protection which comprises relatively movable contact means and means releasable to effect automatic opening of said contact means, operating means for moving the contacts between open and closed positions, the operating means including a releasable arm movable between latched and unlatched positions, a pivoted latch lever operable to effect latching or unlatching of the releasable arm, a latch retainer lever effective to releasably retain the latch lever in the latched position; a trip mechanism comprising a trip plate, a position adjusted pivoted trip lever, and bimetal means for actuating the latch retainer lever in response to excessive heat radiated to the bimetals by the heater elements when subjected to current in excess of the rating of the heater elements, the trip plate being operatively connected to the retainer lever to move the latch lever to the unlatched position, and the latch
  • the advantage of the device of this invention is that a manually operated toggle mechanism which provides switching control to alternately close and open electrical contacts is combined with an overload relay and 2 provided with lever means associated with the relay for positively tripping the switch in response to an overload current.
  • FIG. 1 is a sectional view of a three-pole overload relay connected to a circuit interrupter in accordance with this invention
  • FIG. 2 is a vertical sectional view taken on the line II-II of FIG. 1, with the outer housing omitted;
  • FIG. 3 is a vertical sectional view taken on the line IIIIII of FIG. 2 showing the trip mechanism in the reset position;
  • FIG. 4 is a vertical sectional view showing the trip mechanism in the tripped position.
  • FIG. 5 is a vertical sectional view of the trip mechanism in a position intermediate those of FIGS. 3 and 4.
  • a circuit" interrupter is generally indicated at 7 and it comprises'a manually operated switch 9 and an overload relay 11, both of which are mounted on a supporting base 13.
  • the switch 9 is a multi-pole, such as a three-pole, switch which includes a pair of stationary contacts 17, a pair of movable contacts 19, as well as movable contact carrier means 21.
  • the switch 9 also comprises a manually operated over-center toggle mechanism generally indicated at 23 which in turn comprises a releasable arm 25 that is pivotally mounted on a pivot pin 27 that extends between a pair of upright frames 29 and 31 (FIG. 2).
  • the overhead toggle mechanism 23 is enclosed within a housing 33 of electrically insulating material and includes a handle 35 which extends upwardly through the upper side of the housing.
  • a trip mechanism which comprises a latch lever 37 and a latch retainer lever 39.
  • the latch lever 37 is an L-shaped or bellcrank type lever which is pivoted on a pair of similar trunnions 41 extending from opposite sides thereof into corresponding apertures in spaced upright frames 29, 31.
  • the latch lever 37 also includes an opening 43 in which the left end of the arm 25 is seated when in the latched position as shown in FIG. 3.
  • the lower end of the latch lever 37 extends to and is engaged by the latch retainer lever 39 as shown in FIG. 3.
  • the latch retainer lever 39 is a substantially vertically extending member having similar trunnions 45 extending from opposite sides thereof and seated 'in corresponding apertures in the spaced upright frames 29, 31.
  • Hole 47 is disposed in the latch retainer lever 39 below the trunnions 45 and outwardly extending lips 49 and 51 are provided at the lower and upper sides of the hole 47.
  • the lower end portion of the latch retainer lever 37 is disposed in an aperture 53 of a trip plate 55 which as shown in FIG. 1 extends from the overload relay 11. When the trip plate 55 is moved by the relay to the left as viewed in FIG.
  • the latch retainer lever 39 rotates clockwise until the lower extremity of the latch retainer lever 37 moves out of the hole 47 and from the lip 49, whereupon the latch lever rotates counterclockwise in response to an upper pressure applied to the upper side of the opening 43 by the releasable arm 25.
  • the releasoccurs, the'heaters 73 cause the bi-metal 71 to move able arm 25 moves until it strikes a stop pin 57 which extends between the upright frames 29, 31.
  • a roller 59 is mounted on a pin 61 at the end of the arm. Movement of the retainer lever 39 and f latch lever 37 in the manner described constitutes tripping of the current interrupter 9 and causes the movable contacts 19 to separate from the stationary contacts 17 (FIG. 1).
  • the tripped position of the arm 25 is shown in FIG. 4 with the roller 59 in contact with the pin 57 as well as in contact with the upper end of the latch lever 37 whereby the latch lever 37 is maintained in the position shown. in FIG. 4.
  • the arm 25 is rotated counterclockwise about the pivot pin 27 until the roller 57 strikes a projection 63 on the lever and at the lower side of the opening 43.
  • the roller 59'strikes the projection 63 it causes the lever to rotate counterclockwise until the left end of the lever 37 isagain seated in the hole 47 of the retainer lever 39.
  • the retainer lever 39 is biased counterclockwise by a wire spring 65 whereby it is normally urged against the lower end of the latch lever 37.
  • the upper end of the opening 43 of the lever 37 is reinforced by a projection 63 which engages the roller and provides a broader surface for contact therewith when the roller 59 is seated in the opening 43.
  • the projection 63 includes a body portion 67a which is secured to the surface of the latch lever 37 in a suitable manner such as spot welding.
  • the upper end of the retainer lever 39 includes an extension 69 (FIG. 5) which is adapted to engage the side of the lever 37 or the projection member 67a when the arm 25 is moving either up or down during tripping or resetting of the switch 9.
  • the relay includes multiple bi-metals 71, bi-metal heaters 73, a cross bar 75, a position adjusted trip lever ln the latched position the overload protection mechanism'does not prevent operation of the switch in a normal manner between on and off positions during vnormal current conditions.
  • a circuit interrupting device comprising relatively movable contact means and means releasable to effect 'automatic opening of said contact means, operating means for moving the contacts between open and closed positions and comprising a releasable arm movable between latched and unlatched positions, a latch l'everoperable to effect unlatching of the releasable arm, a retainer plate effective to releasably retain the latch lever in the latched position, a trip device comprising a trip plate and bi-metal means for activating the trip plate in response to excessive currents, the trip plate: being operatively connected to the retainer plate to move the retainer plate to the unlatched position, and the retainer plate being spring-biased in the latched position with the latch lever and including an extension engageable with the latch lever when in the unlatched i. to maintain the latch lever in a relatching posi- 2.
  • the circuit interrupting device of claim 2 in which the latch lever is a first class lever, and the latch lever comprising one latching end portion latchingly engageable with the retainer plate and a second end portion ei'rgageable with said extension of the retainer plate.
  • circuit interrupting device of claim 3 in which said second end portion comprises a latching surface forfretaining the releasable arm in the latched position.

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US513371A 1974-10-09 1974-10-09 Manually operable circuit interrupter with automatic current overload protection Expired - Lifetime US3930213A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
US513371A US3930213A (en) 1974-10-09 1974-10-09 Manually operable circuit interrupter with automatic current overload protection
ZA00756056A ZA756056B (en) 1974-10-09 1975-09-23 An improvement in or relating to manually operable circuit interrupter with automatic current overload protection
CA236,436A CA1044288A (en) 1974-10-09 1975-09-25 Manually operable circuit interrupter with automatic current overload protection
GB39744/75A GB1515749A (en) 1974-10-09 1975-09-29 Manually operable circuit interrupter with automatic current overload protection
BR7506495*A BR7506495A (pt) 1974-10-09 1975-10-06 Dispositivo de interrupcao de circuito

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US513371A US3930213A (en) 1974-10-09 1974-10-09 Manually operable circuit interrupter with automatic current overload protection

Publications (1)

Publication Number Publication Date
US3930213A true US3930213A (en) 1975-12-30

Family

ID=24042985

Family Applications (1)

Application Number Title Priority Date Filing Date
US513371A Expired - Lifetime US3930213A (en) 1974-10-09 1974-10-09 Manually operable circuit interrupter with automatic current overload protection

Country Status (5)

Country Link
US (1) US3930213A (pt)
BR (1) BR7506495A (pt)
CA (1) CA1044288A (pt)
GB (1) GB1515749A (pt)
ZA (1) ZA756056B (pt)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2838630A1 (de) * 1977-09-06 1979-03-08 Square D Co Mehrpoliger niederspannungsschalter mit ueberstromausloesung
FR2424622A1 (fr) * 1978-04-27 1979-11-23 Lee Wen Fong Interrupteur magnetique automatique
US4288767A (en) * 1976-12-16 1981-09-08 Lee Wen Fong Automatic magnetic switch
US4296396A (en) * 1979-01-31 1981-10-20 La Telemecanique Electrique Manual electric switch with thermal release
EP0563368A1 (en) * 1991-10-18 1993-10-06 Square D Co CURRENT LIMITING SELF-SWITCH.
WO2001065910A3 (en) * 2000-03-08 2002-01-31 Gen Electric Latch resetting arrangement
DE10139917A1 (de) * 2001-08-14 2003-02-27 Abb Patent Gmbh Schaltschloß für ein elektrisches Schaltgerät, insbesondere für einen Motorschutzschalter

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473901A (en) * 1947-07-31 1949-06-21 Westinghouse Electric Corp Push button operated circuit interrupter
US3179768A (en) * 1962-05-03 1965-04-20 Gen Electric Circuit breaker with mechanically isolated trip mechanism

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2473901A (en) * 1947-07-31 1949-06-21 Westinghouse Electric Corp Push button operated circuit interrupter
US3179768A (en) * 1962-05-03 1965-04-20 Gen Electric Circuit breaker with mechanically isolated trip mechanism

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4288767A (en) * 1976-12-16 1981-09-08 Lee Wen Fong Automatic magnetic switch
DE2838630A1 (de) * 1977-09-06 1979-03-08 Square D Co Mehrpoliger niederspannungsschalter mit ueberstromausloesung
FR2424622A1 (fr) * 1978-04-27 1979-11-23 Lee Wen Fong Interrupteur magnetique automatique
US4296396A (en) * 1979-01-31 1981-10-20 La Telemecanique Electrique Manual electric switch with thermal release
EP0563368A1 (en) * 1991-10-18 1993-10-06 Square D Co CURRENT LIMITING SELF-SWITCH.
EP0563368A4 (en) * 1991-10-18 1994-03-17 Square D Co CURRENT LIMITING CIRCUIT BREAKER.
WO2001065910A3 (en) * 2000-03-08 2002-01-31 Gen Electric Latch resetting arrangement
DE10139917A1 (de) * 2001-08-14 2003-02-27 Abb Patent Gmbh Schaltschloß für ein elektrisches Schaltgerät, insbesondere für einen Motorschutzschalter
EP1284494A3 (de) * 2001-08-14 2004-11-03 ABB PATENT GmbH Schaltschloss für ein elektrisches Schaltgerät, insbesondere für einen Motorschutzschalter

Also Published As

Publication number Publication date
GB1515749A (en) 1978-06-28
CA1044288A (en) 1978-12-12
ZA756056B (en) 1976-09-29
BR7506495A (pt) 1976-08-17

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