US3729065A - Means for charging a stored energy circuit breaker closing device - Google Patents

Means for charging a stored energy circuit breaker closing device Download PDF

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Publication number
US3729065A
US3729065A US00121284A US3729065DA US3729065A US 3729065 A US3729065 A US 3729065A US 00121284 A US00121284 A US 00121284A US 3729065D A US3729065D A US 3729065DA US 3729065 A US3729065 A US 3729065A
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United States
Prior art keywords
cam
spring
charging
handle
force
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Expired - Lifetime
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US00121284A
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English (en)
Inventor
R Baskerville
P Yen
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General Electric Co
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General Electric Co
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/22—Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30—Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H01H3/3005—Charging means
    • H01H3/3015—Charging means using cam devices

Definitions

  • the charging means comprises a pair of spaced cams interconnected by a flexible power-transmitting member that winds about the periphery of one cam while unwinding from the periphery of the other.
  • the cam peripheries are so shaped that the torque on the handle needed to charge the spring remains generally constant during most of the charging operation.
  • an object of our invention is to provide, for charging the powerful closing spring of the circuit breaker, charging means which effects the desired charging action in response to a single stroke of the input handle and yet does not require excessive handle force at any point during the stroke.
  • FIG. 1 is a schematic showing of a circuit breaker shown in the closed position with its stored-energy operator completely charged and ready to perform a closing operation when the circuit breaker opens.
  • FIG. 2 shows some of the parts of FIG. 1, i.e., the operating mechanism, when the circuit breaker has been tripped to effect opening.
  • the operating mechanism as illustrated in FIG. 2 has not yet been reset to its force-transmitting condition.
  • FIG. 2a shows the parts of FIG. 2 after the operating mechanism has been reset to its force-transmitting condition.
  • the circuit breaker is still open.
  • FIG. 3 shows the circuit breaker in closed position and the stored-energy operator in a fully discharged condition.
  • FIG. 4 shows the circuit breaker in closed position, the stored-energy operator in a fully discharged condition, and the handle for charging in a cocked position prepared to start a charging operation.
  • FIG. 4a shows a portion of the circuit breaker in an intermediate position during a charging operation.
  • the circuit breaker shown therein comprises separable contacts 11 and 12 connected in a power circuit 13 in order to open and close the circuit.
  • Contact 12 is a movable contact carried by an insulating operating rod 14 between its closed position of FIG. I and its open position of FIGS. 2 and 2a.
  • the movable contact rod 14 is connected to the right hand end of an operating lever 15 which is pivotally mounted on a stationary pivot 16.
  • An opening spring 17 biases operating lever 15 in a counterclockwise direction toward the contact-open position of FIG. 2.
  • Linkage 20 For actuating operating lever 15 in a clockwise closing direction from its open position of FIG. 2, a conventional mechanically trip-free operating linkage 20 is provided.
  • Linkage 20 comprises a pair of toggle links 21 and 22 pivotally joined together by a knee 23.
  • One toggle link 21 is pivotally connected to the left hand end of operating lever 15 by a pivot 25, whereas the other toggle link 22 is connected to the upper end of a guide link 26 by a pivot pin 27.
  • Guide link 26 is pivotally supported at its lower end by a fixed fulcrum 28.
  • Pivot pin 27 carries a latch roller 30 which cooperates with a suitable trip latch 31.
  • toggle 21, 22 is capable of transmitting thrust to movable switch operating lever 15.
  • toggle 21, 22 is extended, thereby driving movable switch contact 12 downwardly toward its closed position.
  • a rotatable cam 35 which operates on a roller 36 mounted on knee 23.
  • Trip latch 31 is pivotally mounted on a fixed pivot 42 that is biased by a spring 43 into its latching position of FIGS. ll and 2a. Tripping of latch 31 is effected by a solenoid 45, energization of which drives latch 31 counterclockwise, freeing the toggle support pin 27 from restraint by the latch.
  • toggle 21, 22 will be rendered inoperative to transmit thrust to movable contact operating lever 15.
  • the opening spring 17 impels movable contact 12 upwardly into its open position of FIG. 2, collapsing toggle 21, 22 into its position of FIG. 2.
  • toggle 21, 22 will remain unable to transmit closing thrust to movable contact operating lever 15.
  • Resetting of latch 31 is effected by spring 43 when guide link 26 is reset from its position of FIG. 2 to its position of FIG. 20 by a reset spring 46.
  • a stored-energy closing device 50 In order to rotate closing cam 35 so as to effect circuit breaker closing, a stored-energy closing device 50 is provided. As seen in FIG. 1, this device comprises a heavy tension spring 51 suitably supported at its upper end by a bracket 52 pivotally mounted on a stationary pivot pin 53. The lower end of spring 51 is attached to a spring retaining member 54 which is pivotally mounted on a crank pin 55. Crank pin 55 is carried by a crank 56, which is keyed to the same shaft 40 as cam 35.
  • closing spring 51 is shown in its fully tensioned or charged state.
  • the spring force rapidly drives the spring retaining member 54 upwardly in an arcuate path, thereby rotating crank 56 and shaft 40 at high speed in a clockwise closing direction.
  • This drives cam 35 in a clockwise closing direction, and if the toggle is in its open position of FIG. 2a, extends the toggle to effect circuit breaker closing.
  • Closing spring 51 is releasably held in its position of FIG. 1 by a closing latch 58 cooperating with a roller 59 on a disk 60 fixed to cam shaft 40.
  • latch 58 blocks disk 60 and shaft 40 from rotating clockwise. But when latch 58 is released, disk 60 and shaft 40 are free to rotate in a clockwise direction under the influence of closing spring 51.
  • Latch 58 can be released by a suitable closing-control solenoid 62, which when energized pivots latch 58 clockwise about a stationary pivot 63 to effect latch release.
  • disk 60 and main shaft 40 can be rotated only in a clockwise direction. Counterclockwise motion of these parts is blocked by a suitable holding pawl 65 cooperating with ratchet teeth 66 on the periphery of disk 60.
  • a manually actuated charging mechanism 70 is provided.
  • This charging mechanism 70 comprises a driven cam 71 and a driving cam 72 connected together by a flexible power-transmitting member in the form of a chain 73.
  • the opposite ends of chain 73 are respectively connected to earns 71 and 72 by pivot pins 74 and 75.
  • Driving cam 72 is mounted for free rotation on stationary pivot 76 laterally spaced from the cam shaft 40 on which cam 71 is mounted.
  • Driven cam 71 is rotatable about the axis of cam shaft 40 and is coupled to the cam shaft by means of a one-way driving connection comprising a pawl 77 and two angularly spaced ratchet teeth 78 and 79 on the cam shaft 40.
  • Driven cam 71 is freely rotatable in a counterclockwise direction with respect to cam shaft 40 but when rotated in a clockwise direction, it drives shaft 40 through pawl 77 and one of the ratchet teeth 78 or 79.
  • the driving cam 72 is adapted to be actuated by a handle 80 mounted for pivotal motion about the axis of a shaft 81.
  • a crank 82 Keyed to shaft 81 is a crank 82 which has a crank pin 83 connected to the upper end of a connecting link 84, the lower end of which is pivotally connected at 86 to driving cam 72.
  • FIG. 1 shows the handle 80 in its normal position
  • FIG. 4 shows it in its cocked position.
  • the charging mechanism is prepared for a charging operation. More specifically, this counterclockwise handle motion drives connecting link 84 downwardly into its position of FIG. 4, thereby rotating cam 72 clockwise into its position of FIG. 4.
  • a reset spring 87 coupled to driven cam 71 through a pin 88 drives driven cam 71 counterclockwise through l of travel from its position of FIG. 1 into its position of FIG. 4.
  • Cam 71 is able to freely rotate in a counterclockwise direction with respect to cam shaft 40, and it therefore carries the pawl 77 from its position of FIG. 1 behind ratchet tooth 78 to its position of FIG. 4 behind ratchet tooth 79.
  • Such counterclockwise motion of cam 71 winds chain 73 about the periphery of cam 71 as it unwinds from the periphery of cam 72, thus setting the chain in its position of FIG. 4 in preparation for a charging operation.
  • reset spring 87 for cam 71 is shown wound about the periphery of a member 89 that is mounted on shaft 40 and is freely rotatable relative to shaft 40.
  • a CHARGING OPERATION FOLLOWING SETTING OF THE CHARGING MECHANISM Charging of the closing spring is effected by pivoting handle 80 clockwise from its cocked position of FIG. 4, through its intermediate position of FIG. 4a, into its normal position of FIG. 1.
  • Such handle motion drives operating rod 84 upwardly, rotating driving cam 72 counterclockwise from its position of FIG. 4, through the position of FIG. 4a, into its position of FIG. 1.
  • chain 73 winds about the periphery of driving cam 72 while unwinding from the periphery of driven cam 71.
  • the periphery of cams 72 and 71 are so shaped that the mechanical advantage of the drive 72, 73, 71 changes during movement from FIG. 4 to FIG. 1 in a manner that varies directly with the torque needed on shaft 40 in order to charge the closing spring 51, thus enabling charging to be effected with a substantially constant torque on the driving handle 80.
  • the effective lever arm 90 continues decreasing as the spring mechanism approaches its lower dead center position near the position shown in FIG. 1, and this further reduces the torque required for spring charging. Although the spring tension is increasing during this later movement, the effective lever arm 91 is decreasing more rapidly, and the net result is reduced torque requirements.
  • the mechanical advantage of the drive mechanism 72, 73, 71 at any given instant is a direct function of (R2)/(R1), where R is the effective radius of driven cam 71 and R1 is the effective radius of driving cam 72. Each of these radii is measured from the axis of the cam to the axis of the straight line portion of chain 73 via a path extending normal to the chain axis.
  • R2 is relatively small and R1 is relatively large, thus providing a relatively small mechanical advantage.
  • R2 has increased to a relatively high value and R1 has decreased to a relatively small value, thus providing a relatively high mechanical advantage at this point.
  • R2 decreases and R1 increases thus lowering the mechanical advantage.
  • the operating rod 84 is arranged to act on cam 72 through an effective lever arm L that increases from a low value to a relatively high value at an intermediate point in the charging operation and then decreases during the final part of the charging operation.
  • This effective lever arm is measured from the axis of pivot 76 to the line of action of operating rod 84 normal to this line of action.
  • cam 72 is provided with spaced teeth 92 that fit into the usual open spaces in the chain 73 between the pins, 93 that connect the chain links together.
  • spring 51 is allowed to discharge very slightly, driving cam shaft 40 a small distance clockwise until pin 59 on disk engages closing latch 58. The parts are then in a position of FIG. 1.
  • cam shaft 40 rotates in a clockwise direction free of spring charging cam 71. This independent movement is permitted by the pawl and ratchet connection 77, 78.
  • a closing spring dischargeable to supply closing force for the circuit breaker, and means for charging said spring comprising:
  • first and second cams mounted for angular motion about laterally spaced axes of rotation
  • unidirectional force-transmitting means for coupling said first cam to said closing spring to effect charging of said spring when said first cam is driven in one angular direction
  • a handle coupled to said second cam and having a normal position and a cocked position
  • a flexible power-transmitting member attached at its respective opposite ends to said cams and wound about the periphery of said second cam when said handle is in its normal position
  • reset biasing means for driving said first cam in a direction to cause said flexible member to wind about the periphery of said first cam in response to movement of said handle from its normal to its cocked position
  • said force-transmitting means for coupling said first cam to said closing spring comprises a spring controller that is mounted for overcenter action with respect to said spring,
  • said spring controller occupies a first dead center position with respect to said spring when said spring is discharged
  • c. means is provided for transmitting charging force to said spring in response to rotation of said spring controller from said first dead center position toward a second dead center position with respect to said spring,
  • said spring tends to discharge and thereby to further rotate its spring controller in response to rotative movement of said spring controller into a predetermined position past said second dead center position
  • said spring controller has its longest effective lever arm during a charging operation when passing through a predetermined intermediate position between said first and second dead center position
  • said cams are so shaped that the mechanical advantage of the cam-flexible member drive is near its highest value when said spring controller has its longest effective lever arm.
  • said handle is coupled to said second cam by means of a linkage that includes a rod pivotally connected to said second cam,
  • the effective lever arm between the line of action of said rod and the axis of rotation of said second cam varies in length during a charging operation to provide a mechanical advantage for the rodsecond cam connection which varies directly with the effective length of said lever arm, said effective length bein near its maximum value when the torque nee ed at said force-transmitting means for charging said spring is highest.

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US00121284A 1971-03-05 1971-03-05 Means for charging a stored energy circuit breaker closing device Expired - Lifetime US3729065A (en)

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Application Number Priority Date Filing Date Title
US12128471A 1971-03-05 1971-03-05

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US00121284A Expired - Lifetime US3729065A (en) 1971-03-05 1971-03-05 Means for charging a stored energy circuit breaker closing device

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US (1) US3729065A (enrdf_load_stackoverflow)
BR (1) BR7201245D0 (enrdf_load_stackoverflow)
DE (1) DE2210052A1 (enrdf_load_stackoverflow)
FR (1) FR2128571B1 (enrdf_load_stackoverflow)
GB (1) GB1356862A (enrdf_load_stackoverflow)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3832504A (en) * 1973-08-27 1974-08-27 Westinghouse Electric Corp Circuit breaker with spring closing means and pawl and rachet spring charging means
US3835277A (en) * 1973-09-14 1974-09-10 Gen Electric Circuit breaker operating mechanism with high-speed low-energy tripping means
US3845263A (en) * 1972-11-07 1974-10-29 Westinghouse Electric Corp Circuit breaker with spring charged operating mechanism
US4153828A (en) * 1976-07-08 1979-05-08 General Electric Company Stored-energy operating means for an electric circuit breaker
US4293834A (en) * 1978-09-06 1981-10-06 Mcgraw-Edison Company Load break switch
US4343030A (en) * 1978-09-06 1982-08-03 Mcgraw-Edison Company Load break switch
US4475021A (en) * 1982-01-29 1984-10-02 Mitsubishi Denki Kabushiki Kaisha Air circuit breaker
US4587390A (en) * 1985-01-07 1986-05-06 Golden Gate Switchboard Co. Vacuum circuit breaker
US4649244A (en) * 1984-01-30 1987-03-10 Merlin Gerin Control device of an electric circuit breaker
US4655098A (en) * 1984-09-03 1987-04-07 Siemens Aktiengesellschaft Drive mechanism for a circuit breaker using eccentric member and directional lock
US5883351A (en) * 1997-05-27 1999-03-16 General Electric Company Ratcheting mechanism for industrial-rated circuit breaker
US5905240A (en) * 1997-10-06 1999-05-18 General Electric Company Contact closing solenoid assembly for air circuit breakers
US5910650A (en) * 1997-05-27 1999-06-08 General Electric Company Manual charging mechanism for industrial-rated circuit breaker
US5981888A (en) * 1998-01-14 1999-11-09 General Electric Company Closing spring lock-out mechanism for an industrial rated circuit breaker
US5981887A (en) * 1997-12-23 1999-11-09 General Electric Company Contact position indicator for an industrial-rated circuit breaker
US6087610A (en) * 1997-05-28 2000-07-11 General Electric Company Closing springs release mechanism for industrial-rated circuit breaker
US6100481A (en) * 1997-06-19 2000-08-08 General Electric Company Circuit breaker operating handle torque compensation assembly
RU2401471C2 (ru) * 2007-08-20 2010-10-10 Эл Эс Индастриал Системз Ко., Лтд. Устройство заводки пружины воздушного автоматического выключателя
CN101937801A (zh) * 2010-09-16 2011-01-05 无锡市凯旋电机有限公司 预储能的遥控塑壳断路器电操机构储能释能装置
WO2018050761A1 (en) * 2016-09-16 2018-03-22 Eaton Industries (Netherlands) B.V. Circuit breaker with open-close-open functionality
WO2018115026A1 (en) 2016-12-23 2018-06-28 Eaton Industries (Austria) Gmbh Mechanism for opening and closing a circuit breaker
USD842258S1 (en) * 2016-03-29 2019-03-05 Kevin Somers Electrical circuit breaker charge cam
US10993377B1 (en) * 2013-10-30 2021-05-04 David L. Terrell Vine cutting tool and method for making and using same
US20220148824A1 (en) * 2020-11-10 2022-05-12 Eaton Intelligent Power Limited Operating mechanism for opening and closing at least two contacts simultaneously
US20220148823A1 (en) * 2020-11-10 2022-05-12 Eaton Intelligent Power Limited Operating mechanism for operating at least one contact

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4791250A (en) * 1987-08-06 1988-12-13 Square D Company Trip-free, three-link switch assembly
CN109742000A (zh) * 2019-02-15 2019-05-10 江苏省如高高压电器有限公司 一种断路器用弹簧操动机构

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909629A (en) * 1957-07-02 1959-10-20 Ite Circuit Breaker Ltd Motor spring operating mechanism for oil circuit breakers
US2972259A (en) * 1959-12-31 1961-02-21 Gen Electric Stored energy operating mechanism for switches
US3095489A (en) * 1960-10-20 1963-06-25 Gen Electric Manual charging means for stored energy closing mechanisms of electric circuit breakers
US3171938A (en) * 1960-12-30 1965-03-02 Ite Circuit Breaker Ltd Manual slow-close on spring operated breaker
US3227244A (en) * 1963-07-20 1966-01-04 Merlin Gerin Energy storing control device for electric circuit breakers
US3235044A (en) * 1963-06-24 1966-02-15 Ite Circuit Breaker Ltd Spring operator manual charging means
US3289790A (en) * 1965-06-16 1966-12-06 Square D Co Spring charging mechanism for a circuit breaker
US3569652A (en) * 1968-10-24 1971-03-09 Westinghouse Electric Corp Cam operated circuit breaker with single stroke manual spring charging means

Family Cites Families (3)

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Publication number Priority date Publication date Assignee Title
FR1058605A (fr) * 1952-06-10 1954-03-17 Merlin Gerin Perfectionnements aux dispositifs de commande des disjoncteurs
CH335280A (fr) * 1956-05-28 1958-12-31 Villars Julio Dispositif de transmission
NL6813678A (enrdf_load_stackoverflow) * 1968-09-25 1970-03-31

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2909629A (en) * 1957-07-02 1959-10-20 Ite Circuit Breaker Ltd Motor spring operating mechanism for oil circuit breakers
US2972259A (en) * 1959-12-31 1961-02-21 Gen Electric Stored energy operating mechanism for switches
US3095489A (en) * 1960-10-20 1963-06-25 Gen Electric Manual charging means for stored energy closing mechanisms of electric circuit breakers
US3171938A (en) * 1960-12-30 1965-03-02 Ite Circuit Breaker Ltd Manual slow-close on spring operated breaker
US3235044A (en) * 1963-06-24 1966-02-15 Ite Circuit Breaker Ltd Spring operator manual charging means
US3227244A (en) * 1963-07-20 1966-01-04 Merlin Gerin Energy storing control device for electric circuit breakers
US3289790A (en) * 1965-06-16 1966-12-06 Square D Co Spring charging mechanism for a circuit breaker
US3569652A (en) * 1968-10-24 1971-03-09 Westinghouse Electric Corp Cam operated circuit breaker with single stroke manual spring charging means

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3845263A (en) * 1972-11-07 1974-10-29 Westinghouse Electric Corp Circuit breaker with spring charged operating mechanism
US3832504A (en) * 1973-08-27 1974-08-27 Westinghouse Electric Corp Circuit breaker with spring closing means and pawl and rachet spring charging means
US3835277A (en) * 1973-09-14 1974-09-10 Gen Electric Circuit breaker operating mechanism with high-speed low-energy tripping means
US4153828A (en) * 1976-07-08 1979-05-08 General Electric Company Stored-energy operating means for an electric circuit breaker
US4293834A (en) * 1978-09-06 1981-10-06 Mcgraw-Edison Company Load break switch
US4343030A (en) * 1978-09-06 1982-08-03 Mcgraw-Edison Company Load break switch
US4475021A (en) * 1982-01-29 1984-10-02 Mitsubishi Denki Kabushiki Kaisha Air circuit breaker
US4649244A (en) * 1984-01-30 1987-03-10 Merlin Gerin Control device of an electric circuit breaker
US4655098A (en) * 1984-09-03 1987-04-07 Siemens Aktiengesellschaft Drive mechanism for a circuit breaker using eccentric member and directional lock
US4587390A (en) * 1985-01-07 1986-05-06 Golden Gate Switchboard Co. Vacuum circuit breaker
US5883351A (en) * 1997-05-27 1999-03-16 General Electric Company Ratcheting mechanism for industrial-rated circuit breaker
US5910650A (en) * 1997-05-27 1999-06-08 General Electric Company Manual charging mechanism for industrial-rated circuit breaker
US6087610A (en) * 1997-05-28 2000-07-11 General Electric Company Closing springs release mechanism for industrial-rated circuit breaker
US6100481A (en) * 1997-06-19 2000-08-08 General Electric Company Circuit breaker operating handle torque compensation assembly
US5905240A (en) * 1997-10-06 1999-05-18 General Electric Company Contact closing solenoid assembly for air circuit breakers
US5981887A (en) * 1997-12-23 1999-11-09 General Electric Company Contact position indicator for an industrial-rated circuit breaker
US5981888A (en) * 1998-01-14 1999-11-09 General Electric Company Closing spring lock-out mechanism for an industrial rated circuit breaker
RU2401471C2 (ru) * 2007-08-20 2010-10-10 Эл Эс Индастриал Системз Ко., Лтд. Устройство заводки пружины воздушного автоматического выключателя
CN101937801A (zh) * 2010-09-16 2011-01-05 无锡市凯旋电机有限公司 预储能的遥控塑壳断路器电操机构储能释能装置
CN101937801B (zh) * 2010-09-16 2012-05-30 无锡市凯旋电机有限公司 预储能的遥控塑壳断路器电操机构储能释能装置
US10993377B1 (en) * 2013-10-30 2021-05-04 David L. Terrell Vine cutting tool and method for making and using same
USD842258S1 (en) * 2016-03-29 2019-03-05 Kevin Somers Electrical circuit breaker charge cam
WO2018050761A1 (en) * 2016-09-16 2018-03-22 Eaton Industries (Netherlands) B.V. Circuit breaker with open-close-open functionality
WO2018115026A1 (en) 2016-12-23 2018-06-28 Eaton Industries (Austria) Gmbh Mechanism for opening and closing a circuit breaker
US20220148824A1 (en) * 2020-11-10 2022-05-12 Eaton Intelligent Power Limited Operating mechanism for opening and closing at least two contacts simultaneously
US20220148823A1 (en) * 2020-11-10 2022-05-12 Eaton Intelligent Power Limited Operating mechanism for operating at least one contact
US11631553B2 (en) * 2020-11-10 2023-04-18 Eaton Intelligent Power Limited Operating mechanism for opening and closing at least two contacts simultaneously
US11715610B2 (en) * 2020-11-10 2023-08-01 Eaton Intelligent Power Limited Operating mechanism for operating at least one contact

Also Published As

Publication number Publication date
GB1356862A (en) 1974-06-19
BR7201245D0 (pt) 1973-12-06
FR2128571A1 (enrdf_load_stackoverflow) 1972-10-20
DE2210052A1 (de) 1972-09-21
FR2128571B1 (enrdf_load_stackoverflow) 1975-10-24

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