US3064099A - Electric circuit breakers - Google Patents

Electric circuit breakers Download PDF

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Publication number
US3064099A
US3064099A US3022A US302260A US3064099A US 3064099 A US3064099 A US 3064099A US 3022 A US3022 A US 3022A US 302260 A US302260 A US 302260A US 3064099 A US3064099 A US 3064099A
Authority
US
United States
Prior art keywords
latch
lever
contact
arm
force
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
US3022A
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English (en)
Inventor
Freeman Alan Twemlow
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.)
Associated Electrical Industries Ltd
Original Assignee
Associated Electrical Industries Ltd
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 Associated Electrical Industries Ltd filed Critical Associated Electrical Industries Ltd
Application granted granted Critical
Publication of US3064099A publication Critical patent/US3064099A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release mechanism
    • H01H2071/506—Latching devices between operating and release mechanism using balls or rollers in the latching device

Definitions

  • This invention relates to electric circuit breakers and aims at providing an improved construction which affords adequate contact pressure and rapid contact breaking while the mechanism which controls the movable contact of the breaker and includes a biasing spring can be arranged sufficiently remote from the contact gap so that the serviceable life of the breaker is not afiected by excessive heat when an arc is formed at the contact openmg.
  • this invention resides in an electric circuit breaker including a pivoted contact arm connected to one end of a spring the other end of which is fastened to the free end of a first lever which is mounted for rotation about a fixed point and co-operates with a fixed stop holding it in an end position when the spring opens the contact movable with the contact arm, and a toggle mechanism having the outer end of one of its two arms, which tend to align when the toggle transmits power, linked to said first lever and the outer end of the other of said arms pivoted to a second lever which carries at its free end one of two co-operatiug parts of a latch, and a third lever pivoted to the contact arm at a point between the point where the spring is connected and the pivot point of the arm, said third lever carrying at its free end the second part of the latch, at least one of the co-operating latch parts being mounted for rotation, and means being associated with the other latch part for its displacement in two opposite directions to close the latch when force from the toggle has to be transmitted through it, and to
  • the two latch parts comprise a roller and a G-shaped catch and one of them is arranged to be moved into and out of its latching position by angular displacement.
  • Such a latching means may be made self-releasing under the baising force of the spring.
  • the latch mechanism may comprise a C- shaped catch and a roller rotatably mounted on one and the other of two members which are under a biasing force tending to move them apart, so that the roller is engaged by the hollow side of the catch when the members are coupled together, and is disengaged allowing the members to separate under the biasing force, when the catch is rotated out of the direction of force which intersects the roller axis and is derived from the said biasing force.
  • MG. 1 shows diagrammatically and by way of example a circuit breaker according to the invention with its contacts closed;
  • FIG. 2 shows the circuit breaker open
  • FIG. 3 shows a latch as preferably used
  • FIG. 4 shows such a latch providing a self-release action when a holding coil is de-energised.
  • FIGS. 1 and 2 the fixed contact of a circuit breaker is shown at 1.
  • a co-operating movable conatct 2 is mounted on a contact arm 3, which is pivoted at a fixed point 4.
  • An actuating arm 5, representing the second lever mentioned above, is rotatable about a pivot preferably but not necessarily coaxial with the pivot 4 of the contact arm 3, and carries at its free end one part of a two-part latch 6 which is shown as a simple circle and may be of a known kind but is preferably of the kind described later in the specification.
  • the third lever mentioned above and carrying the other part of the latch comprises a link 7 pivoted to arm 3 at a point 7a intermediate of the connecting point of a biasing spring SP and the pivot 4.
  • the first lever mentioned above is denoted 8 and pivoted at 9.
  • the lever 8 rests against a stop 10.
  • Lever 8 and actuating arm 5 are interconnected by the two arms of a toggle mechanism denoted 11 and 12.
  • the intermediate pivot 13 of the two toggle arms is movable through a vertical member 14 by a plunger or weight 15, which may conveniently be the armature of a solenoid arranged to be energised for closure of the circuit breaker.
  • a cable (not shown) can be attached to the contact arm 3 near the pivot 4- in a known manner.
  • a convenient form of latch 6 comprises a mechanism as shown diagrammatically in FIG. 3.
  • a roller 16 forming one part of the latch is mounted on lever 7 to be rotatable about pivot 17.
  • a C-shaped catch 18 is mounted on the lever 5 to be rotatable about a pivot which in the closed position is coaxial with the pivot 17 so as to retain the roller against the biasing force exerted by lever 7 and to hold the latch closed for the closing operation of the switch when power has to be transmitted through the toggle to the contact arm.
  • the angular position of the C-shaped member 18 is controlled as by a rod 19 pivoted at 20 to an arm 21 of the member 18, and linked to the switch opening mechanism, for instance to the arm 12 thereof.
  • FIG. 4 shows a modified construction of the latch which allows automatic latch release under the biasing force.
  • the latch is maintained closed during the normal operitaon of the breaker by means of an electro-magnet or a coil 23 which is deenergised for breaker opening.
  • a distance e is provided between a shaft or pivot 22 of the member 18a and the pivot 17 of the roller 16 so that a force derived from the biasing force is eccentric and exerts a torque upon the roller tending to rotate the member 1811 in the direction of the arrow r thereby to release the latch.
  • F or retaining the latch closed an opposing torque must be exerted through shaft 22 or members corresponding to the parts 19 and 21 of FIG. 3. If this opposing torque is removed, for instance by de-energising a tripping coil, the latch opens automatically under the biasing force.
  • the spring however, operating at a point 9 from the pivot 4 produces a torque in the opposite direction equal to 375 lbs. it, so that there is a resultant torque in a clockwise direction of 375 lbs. ft. Since the contact is located at a radius of one foot from the pivot 4, the contact pressure is 375 lbs.
  • An electric circuit breaker having a stationary con tact, a movable contact, an arm carrying said movable contact, a spring having one end acting upon said arm to bias said movable contact away from said stationary contact, a toggle comprising two arms interconnected by a pivot, an actuating member for displacing said pivot in opposite directions for extending and for collapsing said toggle, .
  • a lever means pivotally mounting said lever, means pivotally connecting said lever to an end of one of said toggle arms, means securing the other end of said spring to said lever at a point more remote from the pivotal mounting axis of said lever than the pivotal connection of said lever and toggle arm, an actuating arm pivoted to the free end of the other toggle arm, a lin'k pivotally connected at one end to said contact arm, a coupling having two interengaging parts, one of said coupling parts being carried by said link and the other by said actuating arm, said two coupling parts being constructed and arranged to be engaged to provide a force transmitting connection
  • the spring causes the lever 8 wherein one of the two coupling parts is mounted for rotation, and a means is provided to displace angularly the other coupling part in one sense for coupling closure when the pivot of the toggle mechanism is displaced in the direction for force transmission and in the opposite sense for coupling release when the toggle pivot is displaced in the direction for contact opening.
  • one of the two coupling parts comprises a C-shaped catch member and the other coupling part comprises a roller.
  • one coupling part comprises a roller
  • the other coupling part comprises a catch member
  • An electric circuit breaker including a contact arm, means pivotally mounting one end of said contact arm, a first lever which is mounted for rotation about a fixed point and having a free end, a spring connected to said contact arm and to said free end of said first lever, a fixed stop engageable by said first lever, a second lever, a toggle mechanism having a pair of arms with the outer end of one of said arms linked to said first lever and the outer end of the other of said arms pivoted to said second lever, a latch having two parts with one part carried by said second lever, a third lever pivoted to said contact arm at a point between the point of connection to said spring and said pivotal mounting of said contact arm, said third lever carrying at its free end a second of said latch parts, at least one of said latch partsbeing mounted for rotation on the member by which it is carried, means associated with the other of said latch parts for displacement of said other part in two opposite directions to close the latch when displaced in one direction when force from the toggle has to be transmitted through it and to release the latch when displaced in the opposite direction for
  • An electric circuit breaker including a contact arm, means pivotally mounting one end of said contact arm, a first lever which is mounted for rotation about a fixed point and having a free end, a spring connected to said contact arm and to said free end of said first lever, a fixed stop engageable by said first lever, a toggle mechanism having a pair of arms with the outer end of one of said arms linked to said first lever and the outer end of the other of said arms pivoted to a second lever, a latch having two parts with one part carried by said second lever, a third lever pivoted to said contact arm at a point between the point of connection to said spring and the pivot point of said contact arm, said third lever carrying at its free end a second part of said latch, at least one of said latch parts being mounted for rotation on the member by which it is carried, means associated with the other of said latch parts for displacement of said part in two opposite directions to close the latch when force from the toggle has to be transmitted through it and to release the latch for contact opening under the force of said spring, said latch parts comprising a roller and cooper

Landscapes

  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Breakers (AREA)
US3022A 1959-01-21 1960-01-18 Electric circuit breakers Expired - Lifetime US3064099A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2283/59A GB934210A (en) 1959-01-21 1959-01-21 Improvements in and relating to electric circuit-breakers

Publications (1)

Publication Number Publication Date
US3064099A true US3064099A (en) 1962-11-13

Family

ID=9736835

Family Applications (1)

Application Number Title Priority Date Filing Date
US3022A Expired - Lifetime US3064099A (en) 1959-01-21 1960-01-18 Electric circuit breakers

Country Status (5)

Country Link
US (1) US3064099A (de)
CH (1) CH375413A (de)
DE (1) DE1120563B (de)
FR (1) FR1245966A (de)
GB (1) GB934210A (de)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB425646A (en) * 1933-03-01 1935-03-19 Asea Ab Improvements in high speed automatic electric circuit breakers
US2404950A (en) * 1942-09-15 1946-07-30 Westinghouse Electric Corp Circuit breaker
US2601417A (en) * 1947-01-07 1952-06-24 Ite Circuit Breaker Ltd Circuit breaker
US2866872A (en) * 1956-10-18 1958-12-30 Gen Electric Operating mechanism for an electric circuit breaker
US2881287A (en) * 1958-03-04 1959-04-07 Ite Circuit Breaker Ltd Magnetic latch system for high speed circuit breakers

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE560699C (de) * 1930-05-04 1932-10-06 Bing Werke Vorm Gebr Bing A G Schalter mit UEberstromausloesung fuer Kleintransformatoren
DE616133C (de) * 1932-03-23 1935-07-20 Siemens Schuckertwerke Akt Ges Elektrischer Schalter mit elektromagnetischer und elektrothermischer Ausloesung und Momentein- und -ausschaltung mittels eines Schnappfedermechanismus
US2401005A (en) * 1942-03-05 1946-05-28 Westinghouse Electric Corp Circuit breaker

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB425646A (en) * 1933-03-01 1935-03-19 Asea Ab Improvements in high speed automatic electric circuit breakers
US2404950A (en) * 1942-09-15 1946-07-30 Westinghouse Electric Corp Circuit breaker
US2601417A (en) * 1947-01-07 1952-06-24 Ite Circuit Breaker Ltd Circuit breaker
US2866872A (en) * 1956-10-18 1958-12-30 Gen Electric Operating mechanism for an electric circuit breaker
US2881287A (en) * 1958-03-04 1959-04-07 Ite Circuit Breaker Ltd Magnetic latch system for high speed circuit breakers

Also Published As

Publication number Publication date
FR1245966A (fr) 1960-11-10
CH375413A (de) 1964-02-29
GB934210A (en) 1963-08-14
DE1120563B (de) 1961-12-28

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