US3600540A - Motor-operated spring-closing circuit breaker - Google Patents

Motor-operated spring-closing circuit breaker Download PDF

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US3600540A
US3600540A US874648A US3600540DA US3600540A US 3600540 A US3600540 A US 3600540A US 874648 A US874648 A US 874648A US 3600540D A US3600540D A US 3600540DA US 3600540 A US3600540 A US 3600540A
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circuit breaker
crankshaft
support
output shaft
closing
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US874648A
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Fred Bould
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CBS Corp
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Westinghouse Electric Corp
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00Mechanisms for operating contacts
    • H01H3/22Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00Mechanisms for operating contacts
    • H01H3/22Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H01H3/3005Charging means
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00Mechanisms for operating contacts
    • H01H3/22Power arrangements internal to the switch for operating the driving mechanism
    • H01H3/30Power arrangements internal to the switch for operating the driving mechanism using spring motor
    • H01H2003/3063Decoupling charging handle or motor at end of charging cycle or during charged condition

Definitions

  • Elchik ABSTRACT A circuit breaker comprises spring closing means'and a motor drive structure for charging the springclosing means with improved means supporting the motor drive structure in a cooperating relationship with the spring closing means PATENTED AUG I 71971 SHEET 2 OF 3 PATENIEU AUG 1.7 mil SHEET 3 BF 3 MOTOR-OPERATED SPRING-CLOSING CIRCUIT BREAKER CROSS-REFERENCES TO RELATED APPLICATIONS
  • the applications of Fred Bould et al., Ser. No. 770,296 filed Oct. 24, 1968, and of Fred Bould, Ser. No. 836,313 filed June 25, 1969 are related to the present application in a manner that will be hereinafter set forth under the description of the priorart.
  • the improved supporting or mounting means provides a precise location of the motor roller arm preventing undesirable deflections of the roller arm under load conditions and keeping the loads on the motor housing within safe limits.
  • the mounting is such as to facilitate assembly and removal of the motor drive structure and a standard drill-type motor body can be utilized in the combination.
  • a circuit breaker comprises spring-closing means and a motor drive structure for charging the spring-closing means, with improved means supporting the motor drive structure for operating the spring-closing means.
  • the circuit breaker comprises a metallic housing structure comprising a baseplate and a pair of spaced generally parallel sideplates connected to the baseplate with a pair of spaced generally parallel center plates connected to the base plate within the widthwise dimension of the sideplates.
  • the center plates support a crankshaft that is rotatable about an axis to charge a pair of closing springs, and a ratchet is connected to the crankshaft.
  • the sideplates and center plates support a jackshaft that is movable to operate the movable contacts of the breaker.
  • a reciprocating pawl structure is supported to advance the ratchet to thereby charge the closing springs.
  • the motor drive structure comprises a main body motor part and a rotatable output shaft structure extending from and supported on the main body motor part.
  • the main body motor part is supported on one of the breaker sideplates and the nose or end part of the output shaft structure is supported on a bearing support that is supported on one of the center plates.
  • a cam part or roller arm on the output shaft structure between the nose and the main body motor part rotates and operates against the reciprocating pawl structure to advance the ratchet wheel to thereby charge the closing springs.
  • roller arm By supporting both the main body part and the end part of the motor drive structure, the roller arm is maintained in the operative position under operating loads and the loads on the body of the motor are kept within safe limits.
  • a standard drill-type motor including an aluminum motor housing, can be utilized in the combination.
  • the motor drive structure is readily assembled in available space between one of the sideplates and one of the center plates of the breaker support structure.
  • FIG. 1 is an end view, with parts broken away and with certain parts left out for the purpose of clarity, of a circuit breaker constructed in accordance with principles of this invention
  • FIG. 2 is a sectional view taken generally along the line II-II of FIG. 1;
  • FIG. 3 is a partial sectional view taken generally along the line III-III of FIG. 1 with the crankshaft and closing spring being shown in side elevation;
  • FIG. 4 is a partial sectional view, with parts broken away and with parts left out for the purpose of clarity, looking down on the motor drive structure and reciprocating pawl structure to illustrate the support of the motor drive structure on the one center plate and one sideplate.
  • FIGS. 1 and 2 there is shown in FIGS. 1 and 2 a three-pole circuit breaker 5 comprising a support structure or housing structure 7 and a circuit breaker structure 9 supported on the housing structure 7.
  • the housing structure 7 comprises a metallic baseplate 11, a pair of spaced metallic side plates 13 fixedly secured to flanges of the base plate 1 1, a pair of metallic center plates 17 fixedly mounted on the base plate 11 and a backwall structure indicated generally at 19.
  • the circuit breaker structure 9 is a three-pole structure comprising a stationary contact 21 (FIG. 2) and a movable contact 23 for each pole unit.
  • Each of the movable contacts 23 is supported on a conducting contact arm 25 that is pivotally supported on a terminal conductor 27 by means of a pivotal support means 29.
  • a separate insulating connecting member 31 is pivotally connected at one end thereof to the contact arm 25 and at the other end thereof to a lever 33 that is welded to a common jackshaft 35 that extends across all of the poles of the circuit breaker.
  • the contact structures for the center pole and for the left-hand (FIG. 1) pole are left out of the drawing in FIG. 1 merely for the purpose of clarity. It can be understood that the contact structures for all three-pole units are the same as the one contact structure shown in FIGS. 1 and 2.
  • the jackshaft 35 is supported for pivotal movement, about the elongated axis thereof, on the sideplates 13 and center plates 17.
  • the connecting member 31, levers 33 and jackshaft 35 are part of a stored-energy spring-closing mechanism 39 that is operable to close the contacts 23, 21.
  • the mechanism 39 comprises a link 41 that is pivotally connected, at one end thereof, to the lever 33 of the center pole by means of a pin 43.
  • the link 41 is pivotally connected at the other end thereof, to a link 45 by means of a knee pivot pin 47.
  • a roller member 49 that serves as a cam follower, is mounted on the pin 47 to cooperate with a closing cam 51.
  • the link 45 is pivotally connected at the other end thereof to a latch member 53 by means of a pin 55.
  • the latch member 53 is mounted for pivotal movement about a fixed pivot pin 57 that is supported on the left-hand (FIG. 1) center plate 17.
  • a tension spring 59 is connected to the pin 55 to reset the linkage following a tripping operation of the circuit breaker.
  • the latch member 53 engages the periphery of a trip shaft 63 in proximity to a cutout portion of the shaft 63, which cutout portion is provided so that when the trip shaft 63 is rotated in a counterclockwise direction the latch member 53 will be free to move in the cutout portion to the tripped position.
  • the trip shaft 63 is supported for pivotal movement about the elongated axis thereof between one of the center plates 17 and one of the sideplates 13.
  • a roller latch 67 (FIG. 2) is rotatably supported on and between the twin plates of the closing cam 51.
  • the closing cam 51 is fixedly secured to a crankshaft 71 that is rotatably supported on suitable bearings that are secured to the center plates 17.
  • a pair of crank arms 73 are fixedly mounted on the crankshaft 71 at the opposite ends of the crankshaft 71.
  • a ratchet member 75 is fixedly mounted on the crankshaft 71.
  • a reciprocating pawl structure 78 (FIGS. 1 and 3) is supported on the crankshaft 71 for pivotal reciprocating movement relative to the crankshaft 71 to cooperate with the ratchet 75.
  • a separate tension spring 79 is operatively connected at the end of each of the crank arms 73 by means of a pivot pin 80.
  • Each of the springs 79 is connected to a spring support 81 that is pivotally connected to the associated arm 73 by means of the associated pivot pin 80.
  • Each of the tension springs 79 is connected, at the other end thereof, to a rod 82 that is secured to the center plate 17.
  • a manual operating mechanism, indicated generally at 83 (FIG. 1), is provided for manually charging the closing springs 79.
  • a latch member 85 (FIG. 2) is pivotally mounted on a pin 87 and biased in a clockwise (FIG. 2) direction to the latching position wherein the latch 85 engages the roller 67 to latch the closing cam 51 and crank shaft 71 to prevent counterclockwise movement of the closing cam 51 and crank shaft 71.
  • the circuit breaker is shown in FIG. 2 in the contact open position with the stored energy closing springs 79 in the charged condition.
  • the spring support pins 80 of the tension springs 79 are below a line between the center of the spring support rod 82 and the center or axis of the crank or shaft 71 so that the charged tension springs 79 are operating to bias the crankshaft 71 in a counterclockwise direction.
  • Counterclockwise movement of the crankshaft 71 is prevented by the engagement of the latch member 85 with the latch roller 67 that is mounted on the closing cam 51.
  • the latch member 85 is operated to the unlatching position to close the circuit breaker in a manner described in the abovementioned application of Fred Bould et al., Ser. No.
  • the latch 85 is pivoted in a counterclockwise (FIG. 2) direction to thereby release the roller 67.
  • the closing cam 51 and the crank shaft 71 are free to rotate in a counterclockwise direction, and the closing springs 79, operating on the crank arms 73, operate to rotate the crank shaft 71 in a counterclockwise direction as the springs 79 discharge.
  • the closing cam 51 will force the roller 49, and the link 41, to the closed position.
  • this closing movement ofthe link 41, of the lever 33 (FIG.
  • the circuit breaker may be automatically tripped open, in response to an overload above a predetermined value in any of the pole units, by operation of the trip shaft 63 in a manner described in the patent application of Nagar J. Patel, Ser. No. 770,236, filed Oct. 24, 1968.
  • the trip shaft 63 is rotated in a counterclockwise (FIG. 2) direction.
  • the trip shaft moves to permit the latch member 53 to move in the cutout portion of the trip shaft 63 thereby permitting the latch member 53 to move in a counterclockwise direction about the pivot 57 to the tripped position.
  • the compressed contact springs 93 (FIG.
  • the crankshaft 71 is rotated through an angle of more than 180 of the spring charged operating position seen in FIG. 2.
  • the roller 49 rides off of the peak of the cam 51 into the depression seen in FIG. 2.
  • the spring 59 biases the latch 53 clockwise (FIG.
  • the spring closed means When the circuit breaker is in the contact closed position with the stored energy closing springs 97 discharged the spring closed means is operated to the charged position by operation of the motor drive structure 101 (FIGS. 1, 3 and 4) to rotate the crankshaft 71 through an angle of slightly more than 180 (approximately 184) to charge the springs 79 during which movement the roller 49 rides on a fixed radius of the cam 51 to a position just short of the peak of the cam surface of the cam member 51.
  • This charging movement of the cam 51 is more specifically described in the above-mentioned application Ser. No. 770,296.
  • the trip means indicated generally at (FIG. 1) is automatically operated to rotate the trip shaft 63 to release the latch member 53 and permit the toggle 41, 45 to effect an opening operation in the same manner as was hereinbefore described.
  • the spring 59 operates to draw the roller 49 into the depression of the cam 51 resetting the linkages 53, 41, 45 and the trip shaft 63 is moved by spring means into the latching reset position seen in FIG. 2.
  • the parts at the end of this tripping operation will be in the position seen in FIG. 2 wherein the mechanism is reset and relatched, and wherein the roller member 49 is in the depression of the cam 51 so that the parts are prepared for a closing operation.
  • the reciprocating pawl structure 78 (FIG. 3) comprises a reciprocating member 105 that comprises a pair of spaced twin plates, that straddle the ratchet wheel 75, and a bight portion 107 connecting the twin plates.
  • the reciprocating member 105 is mounted on the crank shaft 71 for movement relative to the crank shaft 71 about the axis of the crank shaft 71.
  • a driving pawl 109 is pivotally mounted on the reciprocating member 105 between the twin plates of the member 105 by means of a pin 1 l3, and a torsion spring 1 biases the pawl 109 in a counterclockwise direction about the pin 113 into engagement with the ratchet wheel 75.
  • a tension spring member 117 biases the reciprocating member 105 in a clockwise direction about the crankshaft 71.
  • a holding pawl 121 is pivotally mounted on one of the center plates 17 by means of a pin 123 and biased in a counterclockwise direction, by means of a torsion spring 125, into engagement with the ratchet wheel 75.
  • the motor drive structure 101 comprises a main body motor part 131 and an output shaft structure 133 supported on the main body motor part 131.
  • the output shaft structure 133 comprises an end part or nose part 135 and a roller arm 137 intermediate the end part 135 and the main body motor part 131.
  • a roller member 139 is rotatably mounted on a pin 141 that is supported on the roller arm 137.
  • the main body motor part 131 comprises a motor housing 148 and an electric motor structure supported within the motor housing 148.
  • a standard aluminum housing drill-type motor has been successfully used in the combination with the back handle of the motor removed and with the two screws 149, that formerly secured back handle of the drill-type motor to the motor housing 148, being used to secure the motor housing 148 to the one sideplate 13.
  • the screws 149 support the motor drive structure 101 on the sideplate 13, and an additional bearing support 151 is supported on one of the center plates to provide additional support for the end part 135 of the output shaft structure 133 to prevent undesirable deflection of the output shaft structure under operating load conditions and to keep the loads on the motor housing within safe limits.
  • a standard aluminum housing drill-type motor can be utilized in the combination with the roller arm being positively located and with the overall support means keeping the loads on the motor housing within safe limits.
  • the bearing support 151 is a roller bearing comprising a race 153 fixedly supported in an opening on the one center plate 17, a journal 155 that receives the end part 135 of the output shaft structure 133 and a plurality of ball bearings 157 disposed around the journal between the journal and race to permit the journal and endpart 135 to freely rotate relative to the race 153 and plate. 17 while supporting the end part 135 against radial movement.
  • the closing springs 79 are in the charged position with the closing latch 85 (FIG. 2) engaging the roller 67 of the cam 51 to latch the crankshaft 71 release of the latch 85, the springs 79 discharge rotating the crankshaft 71 approximately 180 to close the circuit breaker in a manner hereinbefore described.
  • suitable limit switch means is actuated in a well-known manner by the breaker mechanism to energize the motor drive structure 101.
  • the output shaft structure 133 is rotated in a clockwise (FIG. 3) direction about the axis thereof.
  • clockwise FIG.
  • the reciprocating pawl structure 78 will advance the ratchet 75 and crankshaft 71 in a counterclockwise direction, and as the roller arm 137 moves the remaining 180 of a 360 revolution, the spring 117 will return the reciprocating pawl structure 78 to the position seen in FIG. 3 with the holding pawl 121 holding the ratchet 75 and crankshaft 71 in the advanced position.
  • the ratchet 75 is advanced by the driving pawl 109 and alternately held by the holding pawl 121 until the crankshaft 71 moves more than 180 to an overcenter position wherein the charged closing springs 79 again bias the crankshaft 71 in a counterclockwise direction with the ratchet 75 and crankshaft 71 becoming latched from closing movement by the latch member (FIG. 2) which engages the roller 67 on the cam 51 that is fixed to the crankshaft 71.
  • the closing springs 79 reach the fully charged position, the driving pawl 109 is adjacent a missing tooth portion 154 (FIG.
  • the motor 101 is automatically deenergized by suitable limit switch means in a manner well known in the art.
  • a circuit breaker comprising a support structure, a circuit breaker mechanism supported on said support structure, said support structure comprising a baseplate and a pair of spaced generally parallel sideplates connected to said baseplate, a pair of spaced generally parallel center plates connected to said baseplate within the dimension between said sideplates and supported in a generally parallel relationship with respect to said sideplates, said circuit breaker mechanism comprising a closing spring means and a motor drive structure operable to charge said closing spring means, said closing spring means comprising a crankshaft supported for rotation on said center plates and a pair of closing springs connected to saidcrankshaft, a ratchet wheel connected to said crankshaft, a reciprocating pawl structure mounted on said crankshaft for movement relative to said crankshaft, said motor drive structure comprising a main body motor part and a rotatable output shaft structure extending from said main body motor part, said rotatable output shaft structure comprising an end part and an intermediate part, said intermediate part being intermediate said end part and said main body motor part, support means supporting
  • a circuit breaker according to claim 1 said intermediate part comprising an operating arm movable upon rotation of said output shaft through a first part of a 360 revolution of said output shaft structure to move said reciprocating pawl structure against a tooth of said ratchet wheel to advance said ratchet wheel, and spring means operating to return said reciprocating pawl structure to position said reciprocating pawl structure adjacent another tooth of said ratchet wheel during the second part of said 360 revolution of said output shaft structure.
  • a circuit breaker according to claim 1 and said intermediate part of said output shaft structure comprising a roller arm part operable against said reciprocating pawl structure upon rotation of said output shaft structure.
  • a circuit breaker according to claim 3 and said second support comprising a ball bearing support supporting said end part against radial movement during operation of said motor drive structure.
  • a circuit breaker being a multipole circuit breaker
  • said circuit breaker mechanism comprising an elongated jackshaft common to all of the poles of said circuit breaker, each of said poles comprising a stationary contact and a movable contact, means operatively connecting each of said movable contacts with said jackshaft, means supporting said jackshaft on said sideplates and said center plates for movement about the elongated axis thereof, a closing cam on said crankshaft between said center plates, link means operatively connecting said closing cam with said jackshaft, said motor drive structure being operable to operate said reciprocating pawl structure to rotate said crankshaft from a spring discharged position to a spring

Abstract

A circuit breaker comprises spring closing means and a motor drive structure for charging the spring-closing means with improved means supporting the motor drive structure in a cooperating relationship with the spring closing means.

Description

United States atent Inventor Fred Bould Pittsburgh, Pa.
Appl.' No. 874,648
Filed Nov. 6, 1969 Patented Aug. 17, 1971 Assignee Westinghouse Electric Corporation Pittsburgh, Pa.
MOTOR-OPERATED SPRING-CLOSING CIRCUIT BREAKER 5 Claims, 4 Drawing Figs.
US. Cl 200/153, 200/50 Int. Cl 01h 3/00 Field 01 Search 335/68, 76;
ZOO/153.23, 153; 74/2, 575
References Cited UNITED STATES PATENTS 6/1953 Lingal et a1. 74/2 X 6/1960 Hay 200/153X 5/1965 Frink etal.. 200/153X 5/1966 Fischer 200/153 Primary Examiner--Miiton O. Hirshfieid Assistant Examiner-Ulysses Weldon Alt0rney.\'A. T. Stratton, C. L. McHale and W. A. Elchik ABSTRACT: A circuit breaker comprises spring closing means'and a motor drive structure for charging the springclosing means with improved means supporting the motor drive structure in a cooperating relationship with the spring closing means PATENTED AUG I 71971 SHEET 2 OF 3 PATENIEU AUG 1.7 mil SHEET 3 BF 3 MOTOR-OPERATED SPRING-CLOSING CIRCUIT BREAKER CROSS-REFERENCES TO RELATED APPLICATIONS The applications of Fred Bould et al., Ser. No. 770,296 filed Oct. 24, 1968, and of Fred Bould, Ser. No. 836,313 filed June 25, 1969 are related to the present application in a manner that will be hereinafter set forth under the description of the priorart.
BACKGROUND OF THE INVENTION 1. Field of the Invention Motor-operated spring-closing circuit breaker.
2. Description of the Prior Art In the above-mentioned application of Fred Bould et al., Ser. No. 770,296, ,there is disclosed a spring-closing mechanism for closing a circuit breaker, with manual means for charging the spring-closing mechanism. In the above-mentioned application of Fred Bould, Ser. No. 836,313 there is disclosed a motor-operated spring-closing circuit breaker. The present invention is an improvement over both of the abovementioned applications in that the present invention provides an improved motor-operated spring-closing circuit breaker with-improved means supporting the motor drive structure in a cooperating relationship with the spring-closing means. The improved supporting or mounting means provides a precise location of the motor roller arm preventing undesirable deflections of the roller arm under load conditions and keeping the loads on the motor housing within safe limits. The mounting is such as to facilitate assembly and removal of the motor drive structure and a standard drill-type motor body can be utilized in the combination.
SUMMARY OF THE INVENTION A circuit breaker comprises spring-closing means and a motor drive structure for charging the spring-closing means, with improved means supporting the motor drive structure for operating the spring-closing means. The circuit breaker comprises a metallic housing structure comprising a baseplate and a pair of spaced generally parallel sideplates connected to the baseplate with a pair of spaced generally parallel center plates connected to the base plate within the widthwise dimension of the sideplates. The center plates support a crankshaft that is rotatable about an axis to charge a pair of closing springs, and a ratchet is connected to the crankshaft. The sideplates and center plates support a jackshaft that is movable to operate the movable contacts of the breaker. A reciprocating pawl structure is supported to advance the ratchet to thereby charge the closing springs. The motor drive structure comprises a main body motor part and a rotatable output shaft structure extending from and supported on the main body motor part. The main body motor part is supported on one of the breaker sideplates and the nose or end part of the output shaft structure is supported on a bearing support that is supported on one of the center plates. Upon energization of the motor and rotation of the output shaft structure, a cam part or roller arm on the output shaft structure between the nose and the main body motor part rotates and operates against the reciprocating pawl structure to advance the ratchet wheel to thereby charge the closing springs. By supporting both the main body part and the end part of the motor drive structure, the roller arm is maintained in the operative position under operating loads and the loads on the body of the motor are kept within safe limits. A standard drill-type motor, including an aluminum motor housing, can be utilized in the combination. The motor drive structure is readily assembled in available space between one of the sideplates and one of the center plates of the breaker support structure.
FIG. 1 is an end view, with parts broken away and with certain parts left out for the purpose of clarity, of a circuit breaker constructed in accordance with principles of this invention;
FIG. 2 is a sectional view taken generally along the line II-II of FIG. 1;
FIG. 3 is a partial sectional view taken generally along the line III-III of FIG. 1 with the crankshaft and closing spring being shown in side elevation; and
FIG. 4 is a partial sectional view, with parts broken away and with parts left out for the purpose of clarity, looking down on the motor drive structure and reciprocating pawl structure to illustrate the support of the motor drive structure on the one center plate and one sideplate.
DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the drawings, there is shown in FIGS. 1 and 2 a three-pole circuit breaker 5 comprising a support structure or housing structure 7 and a circuit breaker structure 9 supported on the housing structure 7. The housing structure 7 comprises a metallic baseplate 11, a pair of spaced metallic side plates 13 fixedly secured to flanges of the base plate 1 1, a pair of metallic center plates 17 fixedly mounted on the base plate 11 and a backwall structure indicated generally at 19.
The circuit breaker structure 9 is a three-pole structure comprising a stationary contact 21 (FIG. 2) and a movable contact 23 for each pole unit. Each of the movable contacts 23 is supported on a conducting contact arm 25 that is pivotally supported on a terminal conductor 27 by means of a pivotal support means 29. In each pole unit, a separate insulating connecting member 31 is pivotally connected at one end thereof to the contact arm 25 and at the other end thereof to a lever 33 that is welded to a common jackshaft 35 that extends across all of the poles of the circuit breaker. There is a separate lever 33 for each pole unit welded to the common jackshaft 35. Only one of the contact structures is shown in FIG. 1. The contact structures for the center pole and for the left-hand (FIG. 1) pole are left out of the drawing in FIG. 1 merely for the purpose of clarity. It can be understood that the contact structures for all three-pole units are the same as the one contact structure shown in FIGS. 1 and 2.
The jackshaft 35 is supported for pivotal movement, about the elongated axis thereof, on the sideplates 13 and center plates 17. The connecting member 31, levers 33 and jackshaft 35 are part of a stored-energy spring-closing mechanism 39 that is operable to close the contacts 23, 21. The mechanism 39 comprises a link 41 that is pivotally connected, at one end thereof, to the lever 33 of the center pole by means of a pin 43. The link 41 is pivotally connected at the other end thereof, to a link 45 by means of a knee pivot pin 47. A roller member 49, that serves as a cam follower, is mounted on the pin 47 to cooperate with a closing cam 51. The link 45 is pivotally connected at the other end thereof to a latch member 53 by means of a pin 55. The latch member 53 is mounted for pivotal movement about a fixed pivot pin 57 that is supported on the left-hand (FIG. 1) center plate 17. A tension spring 59 is connected to the pin 55 to reset the linkage following a tripping operation of the circuit breaker. The latch member 53 engages the periphery of a trip shaft 63 in proximity to a cutout portion of the shaft 63, which cutout portion is provided so that when the trip shaft 63 is rotated in a counterclockwise direction the latch member 53 will be free to move in the cutout portion to the tripped position. The trip shaft 63 is supported for pivotal movement about the elongated axis thereof between one of the center plates 17 and one of the sideplates 13.
A roller latch 67 (FIG. 2) is rotatably supported on and between the twin plates of the closing cam 51. The closing cam 51 is fixedly secured to a crankshaft 71 that is rotatably supported on suitable bearings that are secured to the center plates 17. A pair of crank arms 73 are fixedly mounted on the crankshaft 71 at the opposite ends of the crankshaft 71. A ratchet member 75 is fixedly mounted on the crankshaft 71. A reciprocating pawl structure 78 (FIGS. 1 and 3) is supported on the crankshaft 71 for pivotal reciprocating movement relative to the crankshaft 71 to cooperate with the ratchet 75. A separate tension spring 79 is operatively connected at the end of each of the crank arms 73 by means of a pivot pin 80. Each of the springs 79 is connected to a spring support 81 that is pivotally connected to the associated arm 73 by means of the associated pivot pin 80. Each of the tension springs 79 is connected, at the other end thereof, to a rod 82 that is secured to the center plate 17. A manual operating mechanism, indicated generally at 83 (FIG. 1), is provided for manually charging the closing springs 79. A latch member 85 (FIG. 2) is pivotally mounted on a pin 87 and biased in a clockwise (FIG. 2) direction to the latching position wherein the latch 85 engages the roller 67 to latch the closing cam 51 and crank shaft 71 to prevent counterclockwise movement of the closing cam 51 and crank shaft 71.
The circuit breaker is shown in FIG. 2 in the contact open position with the stored energy closing springs 79 in the charged condition. As is shown in FIG. 2, the spring support pins 80 of the tension springs 79 are below a line between the center of the spring support rod 82 and the center or axis of the crank or shaft 71 so that the charged tension springs 79 are operating to bias the crankshaft 71 in a counterclockwise direction. Counterclockwise movement of the crankshaft 71 is prevented by the engagement of the latch member 85 with the latch roller 67 that is mounted on the closing cam 51. The latch member 85 is operated to the unlatching position to close the circuit breaker in a manner described in the abovementioned application of Fred Bould et al., Ser. No. 770,296. When it is desired to close the breaker, the latch 85 is pivoted in a counterclockwise (FIG. 2) direction to thereby release the roller 67. When the roller 67 is released, the closing cam 51 and the crank shaft 71 are free to rotate in a counterclockwise direction, and the closing springs 79, operating on the crank arms 73, operate to rotate the crank shaft 71 in a counterclockwise direction as the springs 79 discharge. During this movement, the closing cam 51 will force the roller 49, and the link 41, to the closed position. During this closing movement ofthe link 41, of the lever 33 (FIG. 2) of the center pole unit is forced in a counterclockwise direction to rotate the jackshaft e5 counterclockwise to simultaneously move the three contact arms 25 in a clockwise direction about the pivots 29 to the closed position. In the closed position, the engagement of the closing cam 51 with the roller 49 serves to prop the link member 41 in the closed position to thereby maintain the jackshaft 35 and contacts 23 in the closed position.
With the contacts in the closed position and the closing spring discharged, the circuit breaker may be automatically tripped open, in response to an overload above a predetermined value in any of the pole units, by operation of the trip shaft 63 in a manner described in the patent application of Nagar J. Patel, Ser. No. 770,236, filed Oct. 24, 1968. During the tripping operation, the trip shaft 63 is rotated in a counterclockwise (FIG. 2) direction. When the trip shaft 63 is rotated counterclockwise, the trip shaft moves to permit the latch member 53 to move in the cutout portion of the trip shaft 63 thereby permitting the latch member 53 to move in a counterclockwise direction about the pivot 57 to the tripped position. The compressed contact springs 93 (FIG. 2) and an opening spring 99 (FIG. 1) then operate to move the contact arms 25 toward the open position which movement occurs because the pivot 55 is free to move so that the link 45 can move to the tripped position with the toggle 45, 41 collapsing to permit the lever 33 and jack shaft 35 to move in a clockwise direction to the tripped open position. Thus, movement of the trip shaft 63 to the tripped position permits the members 41, 45, 53 to move to the tripped position wherein the roller 49 and link 41 no longer restrain the lever 33 in the closed position, and the springs 93, 99 operate to move the jackshaft 35 and the three contact arms 25 to the tripped open position.
With the circuit breaker in the tripped open position, the breaker is reset and the closing springs 79 are charged by operation of the motordrive structure 101 in a manner to be hereinafter more specifically described. In order to reset the circuit breaker and charge the closing springs 79, the crankshaft 71 is rotated through an angle of more than 180 of the spring charged operating position seen in FIG. 2. As the crankshaft 71 moves to the position seen in FIG. 2, the roller 49 rides off of the peak of the cam 51 into the depression seen in FIG. 2. When the roller 49 is free to move into the depression of thecam 51, the spring 59 (FIG. I) biases the latch 53 clockwise (FIG. 2) to move the latch 53 to the reset position pulling links 45, 41 and the roller 49 to the reset position wherein the roller 49 is positioned in the depression of the cam 51 (FIG. 2). When the latch 53 moves out of the notch of the trip shaft 63, suitable spring meansoperates to rotate the trip shaft 63 clockwise to the latching position wherein the periphery of the trip shaft 63 again latches the latch member 53 to latch the parts in the reset position seen in FIG. 2. As the crankshaft 71 moves more than I80 to the position seen in FIG. 2, the springs 79, which are moved overcenter, take over to bias the crankshaft 71 in a counterclockwise (FIG. 2) direction, and the roller 67 engages the latch to latch the crankshaft 71 in the charged position seen in FIG. 2, and the circuit breaker is prepared for another closing operation.
When the circuit breaker is in the contact closed position with the stored energy closing springs 97 discharged the spring closed means is operated to the charged position by operation of the motor drive structure 101 (FIGS. 1, 3 and 4) to rotate the crankshaft 71 through an angle of slightly more than 180 (approximately 184) to charge the springs 79 during which movement the roller 49 rides on a fixed radius of the cam 51 to a position just short of the peak of the cam surface of the cam member 51. This charging movement of the cam 51 is more specifically described in the above-mentioned application Ser. No. 770,296.
With the parts in the contact closed spring charged position, the following sequence of operations can occur.
Upon the occurrence of an overload above a predetermined value, the trip means indicated generally at (FIG. 1) is automatically operated to rotate the trip shaft 63 to release the latch member 53 and permit the toggle 41, 45 to effect an opening operation in the same manner as was hereinbefore described. With the toggle 41, 45 collapsed, the spring 59 operates to draw the roller 49 into the depression of the cam 51 resetting the linkages 53, 41, 45 and the trip shaft 63 is moved by spring means into the latching reset position seen in FIG. 2. The parts at the end of this tripping operation will be in the position seen in FIG. 2 wherein the mechanism is reset and relatched, and wherein the roller member 49 is in the depression of the cam 51 so that the parts are prepared for a closing operation. When the closing springs 79 are charged an operator can immediately operate the closing latch 85 (FIG. 2) to release the roller 67 whereupon the circuit breaker is operated to the closed position in the same manner as was hereinbefore described. With the parts in the closed position, if an overload above the predetermined value occurs the trip mans 95 will be automatically operated to rotate the trip shaft 63 to the tripped position to effect a tripping operation in the same manner as mentioned before described. With the parts in the tripped position and the closing springs 79 discharged, another charging operation of the closing springs 79 will be required in order to provide another closing operation. Thus, when the circuit breaker is in the contact closed spring charged position, the circuit breaker can be tripped and then closed and then tripped again in rapid sequence.
The reciprocating pawl structure 78 (FIG. 3) comprises a reciprocating member 105 that comprises a pair of spaced twin plates, that straddle the ratchet wheel 75, and a bight portion 107 connecting the twin plates. The reciprocating member 105 is mounted on the crank shaft 71 for movement relative to the crank shaft 71 about the axis of the crank shaft 71. A driving pawl 109 is pivotally mounted on the reciprocating member 105 between the twin plates of the member 105 by means of a pin 1 l3, and a torsion spring 1 biases the pawl 109 in a counterclockwise direction about the pin 113 into engagement with the ratchet wheel 75. A tension spring member 117 biases the reciprocating member 105 in a clockwise direction about the crankshaft 71. A holding pawl 121 is pivotally mounted on one of the center plates 17 by means of a pin 123 and biased in a counterclockwise direction, by means of a torsion spring 125, into engagement with the ratchet wheel 75.
The motor drive structure 101 comprises a main body motor part 131 and an output shaft structure 133 supported on the main body motor part 131. The output shaft structure 133 comprises an end part or nose part 135 and a roller arm 137 intermediate the end part 135 and the main body motor part 131. A roller member 139 is rotatably mounted on a pin 141 that is supported on the roller arm 137. The main body motor part 131 comprises a motor housing 148 and an electric motor structure supported within the motor housing 148. A standard aluminum housing drill-type motor has been successfully used in the combination with the back handle of the motor removed and with the two screws 149, that formerly secured back handle of the drill-type motor to the motor housing 148, being used to secure the motor housing 148 to the one sideplate 13. The screws 149 support the motor drive structure 101 on the sideplate 13, and an additional bearing support 151 is supported on one of the center plates to provide additional support for the end part 135 of the output shaft structure 133 to prevent undesirable deflection of the output shaft structure under operating load conditions and to keep the loads on the motor housing within safe limits. With the improved mounting means of this invention a standard aluminum housing drill-type motor can be utilized in the combination with the roller arm being positively located and with the overall support means keeping the loads on the motor housing within safe limits.
As can be understood with reference to FIG. 4, the bearing support 151 is a roller bearing comprising a race 153 fixedly supported in an opening on the one center plate 17, a journal 155 that receives the end part 135 of the output shaft structure 133 and a plurality of ball bearings 157 disposed around the journal between the journal and race to permit the journal and endpart 135 to freely rotate relative to the race 153 and plate. 17 while supporting the end part 135 against radial movement.
As can be seen in FIG. 3, the closing springs 79 are in the charged position with the closing latch 85 (FIG. 2) engaging the roller 67 of the cam 51 to latch the crankshaft 71 release of the latch 85, the springs 79 discharge rotating the crankshaft 71 approximately 180 to close the circuit breaker in a manner hereinbefore described. Upon discharge of the closing springs 79 suitable limit switch means is actuated in a well-known manner by the breaker mechanism to energize the motor drive structure 101. Upon energization of the motor drive structure 101, the output shaft structure 133 is rotated in a clockwise (FIG. 3) direction about the axis thereof. Upon clockwise (FIG. 3) rotation of the output shaft structure 133 the roller arm 137 is rotated and during each revolution of the output shaft structure 133 the roller 139, operating against the bight part 107 of the reciprocating pawl structure 78 moves the reciprocating pawl structure 78 in a counterclockwise direction during which movement the driving pawl of 109 operates against one of the teeth of the ratchet 75 to advance the ratchet 75 and crankshaft 71. As the roller arm 137 moves I80 from the position seen in FIG. 3, the reciprocating pawl structure 78 will advance the ratchet 75 and crankshaft 71 in a counterclockwise direction, and as the roller arm 137 moves the remaining 180 of a 360 revolution, the spring 117 will return the reciprocating pawl structure 78 to the position seen in FIG. 3 with the holding pawl 121 holding the ratchet 75 and crankshaft 71 in the advanced position. Thus, as the output shaft structure 133 rotates, the ratchet 75 is advanced by the driving pawl 109 and alternately held by the holding pawl 121 until the crankshaft 71 moves more than 180 to an overcenter position wherein the charged closing springs 79 again bias the crankshaft 71 in a counterclockwise direction with the ratchet 75 and crankshaft 71 becoming latched from closing movement by the latch member (FIG. 2) which engages the roller 67 on the cam 51 that is fixed to the crankshaft 71. When the closing springs 79 reach the fully charged position, the driving pawl 109 is adjacent a missing tooth portion 154 (FIG. 3) of the ratchet 75 so that continued rotation of the motor will not operate against the teeth of the ratchet 75, and the motor can be brought to a stopped condition without damaging the parts and without putting undue forces on the parts. The motor 101 is automatically deenergized by suitable limit switch means in a manner well known in the art.
I claim as my invention:
1. A circuit breaker comprising a support structure, a circuit breaker mechanism supported on said support structure, said support structure comprising a baseplate and a pair of spaced generally parallel sideplates connected to said baseplate, a pair of spaced generally parallel center plates connected to said baseplate within the dimension between said sideplates and supported in a generally parallel relationship with respect to said sideplates, said circuit breaker mechanism comprising a closing spring means and a motor drive structure operable to charge said closing spring means, said closing spring means comprising a crankshaft supported for rotation on said center plates and a pair of closing springs connected to saidcrankshaft, a ratchet wheel connected to said crankshaft, a reciprocating pawl structure mounted on said crankshaft for movement relative to said crankshaft, said motor drive structure comprising a main body motor part and a rotatable output shaft structure extending from said main body motor part, said rotatable output shaft structure comprising an end part and an intermediate part, said intermediate part being intermediate said end part and said main body motor part, support means supporting said motor drive structure on said support structure, said support means comprising a first support and a second support, said first support fixedly supporting said main body motor part on one of said sideplates, said second support comprising a bearing support supported on one of said center plates and receiving said end part of said output shaft structure therein, said bearing support supporting said end part of said output shaft structure against radial movement with said end part rotating on said bearing support during operation of motor drive structure, and upon energization of said motor drive structure said output shaft rotating and said intermediate part operating against said reciprocating pawl structure to advance said ratchet wheel to thereby rotate said crankshaft to charge said closing spring means.
2. A circuit breaker according to claim 1, said intermediate part comprising an operating arm movable upon rotation of said output shaft through a first part of a 360 revolution of said output shaft structure to move said reciprocating pawl structure against a tooth of said ratchet wheel to advance said ratchet wheel, and spring means operating to return said reciprocating pawl structure to position said reciprocating pawl structure adjacent another tooth of said ratchet wheel during the second part of said 360 revolution of said output shaft structure.
3. A circuit breaker according to claim 1, and said intermediate part of said output shaft structure comprising a roller arm part operable against said reciprocating pawl structure upon rotation of said output shaft structure.
4. A circuit breaker according to claim 3, and said second support comprising a ball bearing support supporting said end part against radial movement during operation of said motor drive structure.
5. A circuit breaker according to claim, said circuit breaker being a multipole circuit breaker, said circuit breaker mechanism comprising an elongated jackshaft common to all of the poles of said circuit breaker, each of said poles comprising a stationary contact and a movable contact, means operatively connecting each of said movable contacts with said jackshaft, means supporting said jackshaft on said sideplates and said center plates for movement about the elongated axis thereof, a closing cam on said crankshaft between said center plates, link means operatively connecting said closing cam with said jackshaft, said motor drive structure being operable to operate said reciprocating pawl structure to rotate said crankshaft from a spring discharged position to a spring

Claims (5)

1. A circuit breaker comprising a support structure, a circuit breaker mechanism supported on said support structure, said support structure comprising a baseplate and a pair of spaced generally parallel sideplates connected to said baseplate, a pair of spaced generally parallel center plates connected to said baseplate within the dimension between said sideplates and supported in a generally parallel relationship with respect to said sideplates, said circuit breaker mechanism comprising a closing spring means and a motor drive structure operable to charge said closing spring means, said closing spring means comprising a crankshaft supported for rotation on said center plates and a pair of closing springs connected to said crankshaft, a ratchet wheel connected to said crankshaft, a reciprocating pawl structure mounted on said crankshaft for movement relative to said crankshaft, said motor drive structure comprising a main body motor part and a rotatable output shaft structure extending from said main body motor part, said rotatable output shaft structure comprising an end part and an intermediate part, said intermediate part being intermediate said end part and said main body motor part, support means supporting said motor drive structure on said support sTructure, said support means comprising a first support and a second support, said first support fixedly supporting said main body motor part on one of said sideplates, said second support comprising a bearing support supported on one of said center plates and receiving said end part of said output shaft structure therein, said bearing support supporting said end part of said output shaft structure against radial movement with said end part rotating on said bearing support during operation of motor drive structure, and upon energization of said motor drive structure said output shaft rotating and said intermediate part operating against said reciprocating pawl structure to advance said ratchet wheel to thereby rotate said crankshaft to charge said closing spring means.
2. A circuit breaker according to claim 1, said intermediate part comprising an operating arm movable upon rotation of said output shaft through a first part of a 360* revolution of said output shaft structure to move said reciprocating pawl structure against a tooth of said ratchet wheel to advance said ratchet wheel, and spring means operating to return said reciprocating pawl structure to position said reciprocating pawl structure adjacent another tooth of said ratchet wheel during the second part of said 360* revolution of said output shaft structure.
3. A circuit breaker according to claim 1, and said intermediate part of said output shaft structure comprising a roller arm part operable against said reciprocating pawl structure upon rotation of said output shaft structure.
4. A circuit breaker according to claim 3, and said second support comprising a ball bearing support supporting said end part against radial movement during operation of said motor drive structure.
5. A circuit breaker according to claim, said circuit breaker being a multipole circuit breaker, said circuit breaker mechanism comprising an elongated jackshaft common to all of the poles of said circuit breaker, each of said poles comprising a stationary contact and a movable contact, means operatively connecting each of said movable contacts with said jackshaft, means supporting said jackshaft on said sideplates and said center plates for movement about the elongated axis thereof, a closing cam on said crankshaft between said center plates, link means operatively connecting said closing cam with said jackshaft, said motor drive structure being operable to operate said reciprocating pawl structure to rotate said crankshaft from a spring discharged position to a spring charged position to charge said closing spring means, latch means for latching said crankshaft in the spring charged position, upon release of said latch means said closing spring means rotating said crankshaft and said closing cam operating through said link means and said jackshaft to move said movable contacts to the closed position.
US874648A 1969-11-06 1969-11-06 Motor-operated spring-closing circuit breaker Expired - Lifetime US3600540A (en)

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US3773995A (en) * 1972-10-27 1973-11-20 Westinghouse Electric Corp Motor advanced spring charging pawl and ratchet mechanism with spring assist
US3806684A (en) * 1972-08-04 1974-04-23 Westinghouse Electric Corp Mechanism for converting a hand-operated circuit breaker to a motor-operated circuit breaker
US4101744A (en) * 1976-10-22 1978-07-18 Gould Inc. Circuit breaker racking mechanism for drawout type switchgear
EP0089464A2 (en) * 1982-01-29 1983-09-28 Mitsubishi Denki Kabushiki Kaisha Air circuit breaker
US4587390A (en) * 1985-01-07 1986-05-06 Golden Gate Switchboard Co. Vacuum circuit breaker
EP0224433A1 (en) * 1985-11-18 1987-06-03 Siemens Aktiengesellschaft Driving mechanism for a low voltage circuit breaker with a ratchet wheel
US4762971A (en) * 1984-04-23 1988-08-09 Mitsubishi Denki Kabushiki Kaisha Spring-type operating mechanism for a circuit interrupter
US5358073A (en) * 1992-02-28 1994-10-25 Sprecher Energie Ag Method and apparatus for tensioning an accumulator spring of a drive of a high-voltage or medium-voltage power circuit breaker
DE4416090C1 (en) * 1994-04-20 1995-06-14 Siemens Ag Bearing arrangement for power switch actuator shaft
US5548261A (en) * 1995-03-03 1996-08-20 Eaton Corporation Trip device for a circuit breaker
EP1914776A1 (en) * 2006-10-17 2008-04-23 LS Industrial Systems Co., Ltd Bearing assembly of switching mechanism for air circuit breaker and fabrication method thereof
US20100266330A1 (en) * 2009-04-17 2010-10-21 Samir Rajauria Motor operator assembly
US20180039297A1 (en) * 2015-02-05 2018-02-08 Zf Friedrichshafen Ag Apparatus and method for adjusting a rotary or pivoting movement of a control element for a vehicle
US11715612B2 (en) 2020-12-29 2023-08-01 Schneider Electric USA, Inc. Low impact auxiliary switch mechanically operated contacts (MOC) mechanism
CN116864328A (en) * 2023-07-17 2023-10-10 辽宁东牧电器制造有限公司 Anti-idle-closing type high-voltage switch operating mechanism

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US2943163A (en) * 1959-03-09 1960-06-28 Gen Electric Interlock arrangement for a circuit breaker having a stored-energy closing device
US3183332A (en) * 1962-08-09 1965-05-11 Westinghouse Electric Corp Circuit breaker closing mechanisms
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Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3806684A (en) * 1972-08-04 1974-04-23 Westinghouse Electric Corp Mechanism for converting a hand-operated circuit breaker to a motor-operated circuit breaker
US3773995A (en) * 1972-10-27 1973-11-20 Westinghouse Electric Corp Motor advanced spring charging pawl and ratchet mechanism with spring assist
US4101744A (en) * 1976-10-22 1978-07-18 Gould Inc. Circuit breaker racking mechanism for drawout type switchgear
EP0089464A2 (en) * 1982-01-29 1983-09-28 Mitsubishi Denki Kabushiki Kaisha Air circuit breaker
US4475021A (en) * 1982-01-29 1984-10-02 Mitsubishi Denki Kabushiki Kaisha Air circuit breaker
EP0089464A3 (en) * 1982-01-29 1987-01-14 Mitsubishi Denki Kabushiki Kaisha Air circuit breaker
US4762971A (en) * 1984-04-23 1988-08-09 Mitsubishi Denki Kabushiki Kaisha Spring-type operating mechanism for a circuit interrupter
US4587390A (en) * 1985-01-07 1986-05-06 Golden Gate Switchboard Co. Vacuum circuit breaker
EP0224433A1 (en) * 1985-11-18 1987-06-03 Siemens Aktiengesellschaft Driving mechanism for a low voltage circuit breaker with a ratchet wheel
US4742200A (en) * 1985-11-18 1988-05-03 Siemens Aktienfesellschaft Actuating device for a low-voltage circuit breaker with a ratchet wheel
US5358073A (en) * 1992-02-28 1994-10-25 Sprecher Energie Ag Method and apparatus for tensioning an accumulator spring of a drive of a high-voltage or medium-voltage power circuit breaker
DE4416090C1 (en) * 1994-04-20 1995-06-14 Siemens Ag Bearing arrangement for power switch actuator shaft
WO1995029496A1 (en) * 1994-04-20 1995-11-02 Siemens Aktiengesellschaft Bearing arrangement for a switch shaft
US5735611A (en) * 1994-04-20 1998-04-07 Siemens Aktiengesellschaft Bearing arrangement for an operating shaft
US5548261A (en) * 1995-03-03 1996-08-20 Eaton Corporation Trip device for a circuit breaker
EP1914776A1 (en) * 2006-10-17 2008-04-23 LS Industrial Systems Co., Ltd Bearing assembly of switching mechanism for air circuit breaker and fabrication method thereof
CN101183621B (en) * 2006-10-17 2010-11-10 Ls产电株式会社 Bearing assembly of switching mechanism for air circuit breaker and fabrication method thereof
US20100266330A1 (en) * 2009-04-17 2010-10-21 Samir Rajauria Motor operator assembly
US20180039297A1 (en) * 2015-02-05 2018-02-08 Zf Friedrichshafen Ag Apparatus and method for adjusting a rotary or pivoting movement of a control element for a vehicle
US11715612B2 (en) 2020-12-29 2023-08-01 Schneider Electric USA, Inc. Low impact auxiliary switch mechanically operated contacts (MOC) mechanism
CN116864328A (en) * 2023-07-17 2023-10-10 辽宁东牧电器制造有限公司 Anti-idle-closing type high-voltage switch operating mechanism
CN116864328B (en) * 2023-07-17 2024-02-02 辽宁东牧电器制造有限公司 Anti-idle-closing type high-voltage switch operating mechanism

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Publication number Publication date
GB1322557A (en) 1973-07-04
BE758635A (en) 1971-04-16
ES384808A1 (en) 1973-02-16

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