US2825787A - Driving mechanisms for circuit breakers - Google Patents

Driving mechanisms for circuit breakers Download PDF

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Publication number
US2825787A
US2825787A US648429A US64842957A US2825787A US 2825787 A US2825787 A US 2825787A US 648429 A US648429 A US 648429A US 64842957 A US64842957 A US 64842957A US 2825787 A US2825787 A US 2825787A
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US
United States
Prior art keywords
springs
arm
intermediate member
opening
circuit
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
US648429A
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English (en)
Inventor
Nijland Hendrik A Hidde
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.)
COQ NV
Original Assignee
COQ NV
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 COQ NV filed Critical COQ NV
Application granted granted Critical
Publication of US2825787A publication Critical patent/US2825787A/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
    • 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
    • H01H2003/3089—Devices for manual releasing of locked charged spring motor; Devices for remote releasing

Definitions

  • the invention relates to a driving mechanism for an electric circuit-breaker comprising, in combination, a stationary part, a movable part, at least one high speed opening :and closing switching contact carried by said movable part, at least one spring adapted to be biased for the opening movement of said contact, at least one spring adapted to be biased for the closing movement of said contact, locking devices being adapted to move automatically into their locking positions during the tensioning of the springs to keep the tensioned springs under tension, a movable intermediate member connected to said contact carrying movable part through said opening spring and its associated locking device and to the stationary part of the mechanism through said closing spring and its associated locking device, an operating member acting on said intermediate member and being adapted to move it in a direction in which all springs are brought under tension simultaneously and the locking devices are brought into their locking positions, means for releasing the locking devices and a fixed stop member defining the end position of the intermediate member in which all springs are released.
  • a driving mechanism of the kind referredto has been disclosed in the U. S. patent specification 2,734,270.
  • the invention has the object to modify said known driving mechanism in such a manner that it can be better adapted to certain requirements than said known driving mechanisms.
  • the spring for opening the circuit-breaker must have a great excess of force.
  • a great force may be required to relatively move the switching contacts held tightly together by the electro-dynamic forces.
  • FIG. 1 designates a switching rod adapted to be axially moved up and down and to cooperate with 'ice fixed switching contacts 2, 3, to which, in a manner not shown, the circuit to be closed and opened by the circuit breaker is connected.
  • the switching rod 1 is connected through an insulator 4 to an arm 5 of a bell-crank 5, 7 which is rotatably mounted on a pivot 6.
  • the arm 7 of the bell-crank 5, 7 is in contact with a fixed abutment 8.
  • the arm 7 is connected through one or more springs 9 to the arm 10 of a lever 10, 12 adapted to be swung about a pivot 11.
  • the lever 10, 12 lies with its arm 12 against a fixed stop member 13.
  • the arm 12 is coup-led through one or more springs 14 to a stationary part 15 of the circuit breaker.
  • the invention relates to a driving mechanism, in which at the beginning of the opening movement of the movable switching contact an additional force is exerted on said contact. It consists in that the contact carrying movable part and the locking device are so constructed as to keep the intermediate member in an intermediate position at a certain distance from the said stop member, when the circuit-breaker is in its closed condition, and a catch-coupling is provided which temporarily connects said contact carrying movable part directly with said intermediate member, when the latter is in its intermediate position, and permits the closing spring to :add its force through the intermediate member and said coupling to the force exerted by the opening spring on said movable part until, after the locking device for the opening spring has been released, said intermediate member is pulled against said stop member.
  • the two-armed lever 19, 12 constitutes an intermediate member which is adapted to be driven by an operating mechanism.
  • This operating mechanism consists of a toggle lever formed by the links 16, 17 and a handle 19, 20 which is rotatably mounted on the shaft 18 and is capable to engage the link 17.
  • To that end the arm 24) is provided with a stud 21 adapted to engage the link 17 of the toggle lever.
  • the arm 7 of the bellcrank 5, 7' is also secured to a locking rod 22 provided with a catch .3 which cooperates with a stud 24 attached to the arm 1%) of the intermediate member 10, 12.
  • the handle 19, 2 9 is swung about its shaft counterclockwise. The result thereof is, that the toggle lever 16, 17 is moved through its stretched position against a fixed abutment 25. Due to this movement of the toggle lever the intermediate member 10, 12 is rotated counterclockwise about the pivot 11, whereby the springs 9 as well as the springs 14 are tensioned (Fig. 2). If the handle 19, 20 should be released in the position according to Fig. 2 the springs 9 and 14 are kept under tension, since the toggle lever 16, 17 remains in its locking position. As soon as the intermediate member 18, 12 has reached the position, in which the springs 9, 14 are tensione-d, the locking rod 22 engages with its catch 23 the stud 24, so that the springs 9 for the opening movement of the circuit breaker are kept under tension.
  • the link 17 of the toggle lever 16, 17 constitutes one arm of the free rotatable bell-crank 17, 26 which is rotatably mounted on the shaft 18 of the handle 19, 20.
  • sfo tliat'tlieopening springs 9 are allowed to draw the bell-crank S, 7 together with the switching rod 1 back to its starting position against the fixed abutment 8.
  • the release of the locking rod 22 is carried out by means of auxiliary device consisting of a rotary three armed lever or bell-crank 29, 30, 31, of which the'axis of rotation is shown at 23.
  • the arm 29 of said bell-crank is connectd to the handle '19, through a rod 32 provided with a slot 33.
  • the arm engages with a stud 34 the lower face of the locking rod 22 and the arm 31 is loaded by a spring 35 and cooperates with a pawl 36, 37, which is pivotally mounted about an axle 38 and may be unlocked with the aid of a slidable rod 39 provided with a push-button 40.
  • a pawl 36, 37 which is pivotally mounted about an axle 38 and may be unlocked with the aid of a slidable rod 39 provided with a push-button 40.
  • the intermediate member 10, 12 is provided with a short third arm 41, which is linked to a rod 43 mounted for sliding movement in a bushing 42. Said rod is provided with a cross-pin 44.
  • the bell-crank 5, 7 has a relatively long third arm 45. When the circuit-breaker is its closed condition (Fig. 3) said arm 45 is nearly in contact with said cross-pin 44.
  • the handle 19, 29 may be replaced by a motor gear. Together with the illustrated device for releasing the toggle lever 16, 17 from its locking positions by means of the handle 19, 20 or a motor gear an electromagnet for the closing of the circuit breaker may be provided, said electromagnet operating on the toggle lever 16, 17 in any suitable manner. Also for opening the circuit breaker an electromagnet may be used, so that the circuit is adapted to be operated from a distance.
  • a driving mechanism for an electric circuit-breaker comprising, in combination, a stationary part, a movable part, at least one high speed opening and closing switching contact carried by said movable part, abutmentsdetiming the end positions of said movable part, at least one springiadapted to be biased for the opening movement of said contact, at least one spring adapted to be biased for the closing movement of said contact, locking devices being adapted to move automatically into their locking positions during the tensioning of the springs to keep the tensioned springs under tension, a movable inter mediate member connected to said contact carrying movable part through said opening spring and its associated locking device and to the stationary part of the mechanism through said closing spring and its associated locking device, an operating member acting on said intermediate member and being adapted to move it in a direction in which all spiings are brought under tension simultaneous- 1y and the locking devices are brought into their locking positions, means for releasing the locking devices, a fixed stop member defining the end position of the intermediate member in which all springs are released, said contact carrying

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  • Breakers (AREA)
US648429A 1956-03-27 1957-03-25 Driving mechanisms for circuit breakers Expired - Lifetime US2825787A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL347245X 1956-03-27

Publications (1)

Publication Number Publication Date
US2825787A true US2825787A (en) 1958-03-04

Family

ID=19784928

Family Applications (1)

Application Number Title Priority Date Filing Date
US648429A Expired - Lifetime US2825787A (en) 1956-03-27 1957-03-25 Driving mechanisms for circuit breakers

Country Status (7)

Country Link
US (1) US2825787A (enrdf_load_stackoverflow)
BE (1) BE547468A (enrdf_load_stackoverflow)
CH (1) CH347245A (enrdf_load_stackoverflow)
DE (1) DE1049956B (enrdf_load_stackoverflow)
FR (1) FR1154461A (enrdf_load_stackoverflow)
GB (1) GB801978A (enrdf_load_stackoverflow)
NL (1) NL88255C (enrdf_load_stackoverflow)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3077788A (en) * 1963-02-19 Device for transmission of curvilinear
NL101146C (enrdf_load_stackoverflow) * 1960-07-02
NL120020C (enrdf_load_stackoverflow) * 1960-07-20
GB2247569A (en) * 1990-08-30 1992-03-04 Mk Electric Ltd Energy storage device/ circuit breaker assembly
DE4326067A1 (de) * 1993-08-03 1995-02-09 Kopp Heinrich Ag Kontaktaufreißeinrichtung für Schutzschaltgeräte
FR2780198B1 (fr) * 1998-06-17 2000-09-01 Cahors App Elec Interrupteur a mecanisme de declenchement de la fermeture et de l'ouverture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
BE547468A (enrdf_load_stackoverflow) 1956-05-15
GB801978A (en) 1958-09-24
DE1049956B (enrdf_load_stackoverflow)
NL205784A (enrdf_load_stackoverflow) 1957-12-16
CH347245A (de) 1960-06-30
NL88255C (enrdf_load_stackoverflow) 1958-05-16
FR1154461A (fr) 1958-04-10

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