US3928826A - Circuit breaker with improved tripped latch means - Google Patents

Circuit breaker with improved tripped latch means Download PDF

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Publication number
US3928826A
US3928826A US474855A US47485574A US3928826A US 3928826 A US3928826 A US 3928826A US 474855 A US474855 A US 474855A US 47485574 A US47485574 A US 47485574A US 3928826 A US3928826 A US 3928826A
Authority
US
United States
Prior art keywords
circuit breaker
latch lever
links
latch
roller
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
US474855A
Other languages
English (en)
Inventor
Alfred E Maier
Robert H Hill
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.)
Westinghouse Electric 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 US474855A priority Critical patent/US3928826A/en
Priority to AR259033A priority patent/AR205465A1/es
Priority to AU81469/75A priority patent/AU497134B2/en
Priority to ZA00753218A priority patent/ZA753218B/xx
Priority to GB21156/75A priority patent/GB1498454A/en
Priority to CA227,766A priority patent/CA1025916A/en
Priority to DE19752523507 priority patent/DE2523507A1/de
Priority to ES1975212735U priority patent/ES212735Y/es
Priority to BE1006694A priority patent/BE829682A/xx
Priority to JP6440375A priority patent/JPS5437303B2/ja
Application granted granted Critical
Publication of US3928826A publication Critical patent/US3928826A/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
    • H01H71/505—Latching devices between operating and release mechanism
    • 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
    • H01H2071/506—Latching devices between operating and release mechanism using balls or rollers in the latching device
    • 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
    • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S200/00—Electricity: circuit makers and breakers
    • Y10S200/42—Contact welding considerations

Definitions

  • latch means comprising a roller, latch lever, and'a linkage mechanism in which the roller is mounted on the latch lever and retaining the latch arm in the latched position, the linkage mechanism including an overcenter toggle for holding the latch lever in the latched position, and means for releasing the overcenter toggle so that the latch lever is movable to the unlatch position.
  • an improved protective device may be provided for a circuit breaker which comprises relatively movable contact means and releasable means to effect opening of said contact means, the releasable means including a releasable arm movable between latched and unlatched positions, latch means latching the releasable arm and comprising a roller, a latch lever, and a linkage mechanism, the roller being mounted on the latch lever for retaining the releasable arm in the latched position, the latch lever being pivotally mounted for movement between latched and unlatched positions, the linkage mechanism comprising an overcenter toggle for holding the latch lever in the latched position, and release means operable to release the overcenter toggle so that the latch lever is movable to the unlatched position.
  • the advantage of the device of this invention is that it provides a latch structure with reduced friction so that there is a force reduction with a corresponding reduction in size to enable the use of standard circuit breaker framework.
  • it enables the use of the positive-on advantage so that the manual handle of the circuit breaker remains in the on position if the contacts are welded together, and the breaker is unlatched.
  • FIG. 1 is a vertical sectional view with parts broken away of a circuit breaker embodying the principlesof this invention
  • FIG. 2 is an enlarged elevational view partly in section showing the trip device of FIG. 1;
  • FIG. 3 is a horizontal sectional view taken on the line IIIIll of FIG. 2;
  • FIG. 4 is an enlarged elevational view of another embodiment of the trip device shown in FIG. 1;
  • FIG. 5 is a horizontal sectional view taken on the line VV of FIG. 4.
  • a circuit breaker generally indicated at 7 in FIG. 1, corresponds to that disclosed in US. Pat. No. 3,560,683 for which reason the description herein is limited to only the primary operating parts.
  • the circuit breaker 7 comprises an insulating housing including a molded insulating base 9 with a detachable cover 11 which housing is separated by suitable insulating barrier means into three adjacent insulating compartments for housing three full units of the multi-pole 2 circuit breaker in a manner known in the art.
  • a pair of solderless terminals 15 and 17 are provided at opposite ends of the associated compartment to enable connection of the circuit breaker to an electric circuit.
  • each of the three pole-unit compartments of the circuit breaker there are a pair of spaced conductors 19 and 21, a stationary contact 23 on the conductor 19, a movable contact 25 on a contact arm 27, and a flexible conductor 29 which extends between the contactarm and the conductor 21.
  • the conductor 21 is electrically connected by associated conductors 31 and 33 to the terminal 17.
  • a circuit passing through the circuit breaker 7 extends from the terminal 15 through the elements 19, 23, 25, 27, 29, 21, 31, 33 to the terminal 17.
  • the contact arm 27 is shown in the open position, the closed position is shown in broken lines with the contacts 23, 25 in the closed circuit position.
  • a single operating mechanism, generally indicated at 35, for controlling all three circuit poles, is mounted in the center pole unit of the circuit breaker.
  • the operating mechanism 35 comprises a frame 37 that comprises spaced supporting plate parts, mounted on the base 9, a pivoted forked operating lever 39, upper and lower toggle links 41, 43 which are pivotally connected by means of a knee pivot pin 45, a pair of tension springs 47, and an insulating handle 49.
  • the upper toggle link 41 is pivotally connected to a movable releasable arm or trip member 51 by means of a pin 53.
  • the releasable arm 51 is pivotally supported on the frame 37 by means of the pivot pin 55.
  • the other end of the releasable arm 51 includes a latch surface 57 which is held in a latch position by a roller 59 which is part of a trip means generally indicated at 61, as shown more particularly in FIG. 2.
  • the trip means 61 (FIG. 2) comprises a frame 63, the roller 59, a latch lever 65, a linkage mechanism 67, a reset lever 69, and a magnetic trip actuator 71.
  • the frame 63 is a U-shaped member, the lower intermediate portion of which is secured by a bolt 72 extending into the base 9.
  • the latch lever 65 is pivotally mounted on a pin 73 which extends between the spaced upright portions of the frame 63, and as shown more particularly in FIG. 3, comprises spaced parallel portions 65a and 65b interconnected by intermediate portion 6'50.
  • the portions 65a, 65b, 650 comprise an integral bifurcated member.
  • the roller 59 is mounted on a pin-75, the ends of which are disposed in corresponding slots 77 in the lever members 650 and 65b.
  • the axes of the slots 77 (FIG.
  • the left end of the lever 65 (FIG. 2) is connected to the linkage mechanism 67 which retains the lever in the latched position.
  • the linkage mechanism 67 comprises upper and lower links 83 and 85.
  • the pair of upper links 83 are pivotally secured to the latch lever portions 65a, 6512, by a pin 87.
  • Two lower links 85 are part of an H-shaped member having an integral interconnecting portion 85a (FIG. 3) which serves as a reinforcing member for the spaced parallel links 85.
  • the spaced lower links 85 are pivotally mounted on corresponding upright frame portions 63 by a pin 89.
  • the lower ends of the upper links 83 are pivotally connected by apin,
  • Each lower link 85 includes a projection 95, which in the latched position is in contact with the pin 87 so that downward pressure of the levers 65 on the pin 87, and ultimately upon the pin 91, is prevented from moving the pin 91 further to the left than is necessary to main tain the latched position of the releasable arm 51.
  • the pin 91 is moved to the right of the line 93 passing through the axes of the pins 87, 89.
  • the toggle mechanism 67 then collapses to the broken line positions of the upper and lower links as shown in FIG. 2, enabling the lever. 65 to rotate counterclockwise, whereby the roller 59 rolls off of the left end of the-arm 51 to permit the arm to raise to the unlatched position, as shown by the broken line positions of parts 65, 83, 85.
  • the force applied on the roller 59 by the arm 51 during its upward rotation causes the pin 75 to yield against the springs 81 along the slots 77 until the arm 51 is above the roller 59.
  • the means by which the pin 91 is moved to the right of the line 93 may include either manual or shunt trip means, such as the magnetic trip actuator 71.
  • the manual means includes the release lever 69 and a manual or push-to-trip button 97.
  • the release lever 69 is pivotally mounted at the upper end of a frame 99 of the mag netic trip actuator 71 where it is retained by washers 101 on frame projections 102.
  • the lever 69 includes a down-turned portion 103 which is normally disposed adjacent to the interconnecting portion 85a of the lower link lever 85. Accordingly, when the manual button 97 is depressed against the horizontal portion of the lever 69, the downturned portion 103 thereof moves the pin 91 to the right of the line 93, thereby releasing the latched arm 51.
  • FIGS. 4 Another embodiment of the invention is shown in FIGS. 4 and and differs from that of FIGS. 2 and 3 in that the axis of the pin 91 is disposed slightly to the right of the axis line 93, when the lever 51 is in the latched position as shown.
  • the lower links 85 include projections l05 which are restrained by the reset lever 69 from rotating clockwise to unlatch the unit.
  • the embodiment of the lever 69 in FIG. 4 comprises an extension 107 having out-turned portions 109 (FIG. 5) which engage the projections 105 at 111.
  • the trip means 61 remains in the latched position until the reset lever 69 is rotated counterclockwise, such as by the magnetic trip actuator 71 or the manual button 97.
  • the reset lever 69 is rotated counterclockwise, the out-turned portions 109 move out of contact with the projections 105 whereby the trip means 61 collapses to unlatch the lever 51.
  • the actuator is an electromagnetic device comprising a coil I13 and a 4 plunger 115 which when actuated by the coil moves the member a (FIG. 2) to the right thereby unlatching the arm 51.
  • the plunger 115 moves the lever portion 103 counterclockwise to lift the out-turned portions 109 out of blocking position of the projections and to trip the releasable arm 51.
  • a current sensing transformer 117 (FIG. 1) is disposed over the conductor 31 to sense the overload current and operate through another transformer (not shown) and a static circuit supported on a static circuit board 119, to energize the coil 113 of the magnetic trip actuator 71 to release the armature or plunger by a spring 121, and to thereby effect a tripping operation of the circuit breaker in response to overload current condition above a predetermined value.
  • the tripping operation is more specifically described in the US. Pat. applications of Alfred E. Maier et al, Ser. No. 327,961, now US. Pat. No. 3,808,567 and Alan B. Shimp, Ser. No. 327,973 now US. Pat. No. 3,818,275.
  • Resetting the circuit breaker 7 and the trip means 61 is accomplished by the handle 49 (FIG. 1) which is rotated clockwise so that a flange 123 on the operating lever 39 contacts and rotates the releasable arm 51 until the latch surface 57 is again in position for contact with roller 59. Simultaneously, a portion 49a of the handle engages the lever extension 107 to return the release levers to their latched positions.
  • the device of the present invention provides means of more compact construction and provides for a force reduction through the latch structure with reduced friction.
  • a circuit breaker for controlling an electric circuit comprising relatively movable contacts, a releasable arm to effect automatic opening of the contacts, a trip device for latching the releasable arm and comprising a roller, a latch lever, and a linkage mechanism; the roller being mounted on the latch lever for retaining the releasable arm in the latched position, the latch lever being pivotally mounted for movement between latched and unlatched positions, the linkage mechanism comprising an overcenter toggle for holding the latch lever in the latched position, and release means operable to release the overcenter toggle so that the latch lever is movable to the unlatched position.
  • overcenter toggle comprises a pair of links having a knee pivot therebetween and the knee pivot being movable to the trip position upon operation of the release means.
  • each pair of links comprising first and second links.
  • each pair of links including a knee pivot, and one of each first and second links being pivoted to a corresponding bifurcated leg of the latch lever.
  • each first and second links is pivotally mounted on the side of the knee pivot opposite the latch lever, and the axis of the knee pivot being located on the side of a line passing through the axes of the link pivot mountings opposite the roller when the latch member is latched.

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US474855A 1974-05-30 1974-05-30 Circuit breaker with improved tripped latch means Expired - Lifetime US3928826A (en)

Priority Applications (10)

Application Number Priority Date Filing Date Title
US474855A US3928826A (en) 1974-05-30 1974-05-30 Circuit breaker with improved tripped latch means
AR259033A AR205465A1 (es) 1974-05-30 1975-01-01 Disyuntor electrico
AU81469/75A AU497134B2 (en) 1974-05-30 1975-04-23 Circuit breaker
GB21156/75A GB1498454A (en) 1974-05-30 1975-05-19 Circuit breaker with trip-latch means
ZA00753218A ZA753218B (en) 1974-05-30 1975-05-19 An improvement in or relating to circuit breaker with improved tripped latch means
CA227,766A CA1025916A (en) 1974-05-30 1975-05-26 Circuit breaker with improved tripped latch means
DE19752523507 DE2523507A1 (de) 1974-05-30 1975-05-27 Ausschalter
ES1975212735U ES212735Y (es) 1974-05-30 1975-05-28 Un disyuntor.
BE1006694A BE829682A (fr) 1974-05-30 1975-05-29 Disjoncteur equipe de moyens de verrouillage et de declenchement perfectionnes
JP6440375A JPS5437303B2 (enrdf_load_stackoverflow) 1974-05-30 1975-05-30

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US474855A US3928826A (en) 1974-05-30 1974-05-30 Circuit breaker with improved tripped latch means

Publications (1)

Publication Number Publication Date
US3928826A true US3928826A (en) 1975-12-23

Family

ID=23885209

Family Applications (1)

Application Number Title Priority Date Filing Date
US474855A Expired - Lifetime US3928826A (en) 1974-05-30 1974-05-30 Circuit breaker with improved tripped latch means

Country Status (10)

Country Link
US (1) US3928826A (enrdf_load_stackoverflow)
JP (1) JPS5437303B2 (enrdf_load_stackoverflow)
AR (1) AR205465A1 (enrdf_load_stackoverflow)
AU (1) AU497134B2 (enrdf_load_stackoverflow)
BE (1) BE829682A (enrdf_load_stackoverflow)
CA (1) CA1025916A (enrdf_load_stackoverflow)
DE (1) DE2523507A1 (enrdf_load_stackoverflow)
ES (1) ES212735Y (enrdf_load_stackoverflow)
GB (1) GB1498454A (enrdf_load_stackoverflow)
ZA (1) ZA753218B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110717A (en) * 1976-12-30 1978-08-29 Texas Instruments Incorporated Circuit breaker
FR2585179A1 (fr) * 1985-07-16 1987-01-23 Merlin Gerin Systeme d'accrochage a verrou d'un mecanisme de commande pour disjoncteur electrique
US4679018A (en) * 1986-01-15 1987-07-07 Westinghouse Electric Corp. Circuit breaker with shock resistant latch trip mechanism
EP0798755A3 (en) * 1996-03-26 1998-12-23 Eaton Corporation Roller latching and release mechanism for electrical switching apparatus
CN103187215A (zh) * 2011-12-30 2013-07-03 Ls产电株式会社 塑壳断路器的欠压跳闸装置

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS546548A (en) * 1977-06-17 1979-01-18 Shindengen Electric Mfg Electrophotographic light sensitive material
JPS5447654A (en) * 1977-09-21 1979-04-14 Shindengen Electric Mfg Photosensitive body for electronic photography
JPS5840733B2 (ja) * 1978-02-02 1983-09-07 新電元工業株式会社 電子写真用感光体
JPS54169758U (enrdf_load_stackoverflow) * 1978-05-22 1979-11-30
DE4341214C2 (de) * 1993-12-03 1996-11-07 Kloeckner Moeller Gmbh Auslöseeinheit für Leistungs- oder Schutzschalter
CN118748138B (zh) * 2024-06-22 2025-01-28 浙江俊朗电气自动化股份有限公司 一种高磁通电磁脱扣器及其磁通量自动化检测设备

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3002068A (en) * 1960-08-04 1961-09-26 Fed Pacific Electric Co Circuit breakers
US3164700A (en) * 1959-04-13 1965-01-05 Ite Circuit Breaker Ltd Current limiting circuit breaker with improved auxiliary toggle mechanism
US3624329A (en) * 1968-11-18 1971-11-30 Westinghouse Electric Corp Operating mechanism for a circuit interrupter with toggle means continuously in underset condition

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3164700A (en) * 1959-04-13 1965-01-05 Ite Circuit Breaker Ltd Current limiting circuit breaker with improved auxiliary toggle mechanism
US3002068A (en) * 1960-08-04 1961-09-26 Fed Pacific Electric Co Circuit breakers
US3624329A (en) * 1968-11-18 1971-11-30 Westinghouse Electric Corp Operating mechanism for a circuit interrupter with toggle means continuously in underset condition

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4110717A (en) * 1976-12-30 1978-08-29 Texas Instruments Incorporated Circuit breaker
FR2585179A1 (fr) * 1985-07-16 1987-01-23 Merlin Gerin Systeme d'accrochage a verrou d'un mecanisme de commande pour disjoncteur electrique
US4679018A (en) * 1986-01-15 1987-07-07 Westinghouse Electric Corp. Circuit breaker with shock resistant latch trip mechanism
AU601169B2 (en) * 1986-01-15 1990-09-06 Westinghouse Electric Corporation Circuit breaker with shock resistant latch trip mechanism
EP0798755A3 (en) * 1996-03-26 1998-12-23 Eaton Corporation Roller latching and release mechanism for electrical switching apparatus
CN103187215A (zh) * 2011-12-30 2013-07-03 Ls产电株式会社 塑壳断路器的欠压跳闸装置
CN103187215B (zh) * 2011-12-30 2015-09-23 Ls产电株式会社 塑壳断路器的欠压跳闸装置

Also Published As

Publication number Publication date
ES212735U (es) 1976-06-01
JPS5437303B2 (enrdf_load_stackoverflow) 1979-11-14
BE829682A (fr) 1975-12-01
AU8146975A (en) 1976-11-25
JPS511977A (enrdf_load_stackoverflow) 1976-01-09
AR205465A1 (es) 1976-05-07
CA1025916A (en) 1978-02-07
GB1498454A (en) 1978-01-18
AU497134B2 (en) 1978-11-30
DE2523507A1 (de) 1975-12-11
ES212735Y (es) 1976-11-01
ZA753218B (en) 1976-04-28

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