US3761854A - Overcurrent release of electric switch in particular of switch breaker - Google Patents

Overcurrent release of electric switch in particular of switch breaker Download PDF

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Publication number
US3761854A
US3761854A US00136749A US3761854DA US3761854A US 3761854 A US3761854 A US 3761854A US 00136749 A US00136749 A US 00136749A US 3761854D A US3761854D A US 3761854DA US 3761854 A US3761854 A US 3761854A
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US
United States
Prior art keywords
lever
arm
rod
support
shaft
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
US00136749A
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English (en)
Inventor
T Kubiak
J Jagiello
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.)
LODZKIE ZAKLADY APARATURY ELEK
Original Assignee
LODZKIE ZAKLADY APARATURY ELEK
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
Priority claimed from PL140335A external-priority patent/PL66930B1/pl
Application filed by LODZKIE ZAKLADY APARATURY ELEK filed Critical LODZKIE ZAKLADY APARATURY ELEK
Application granted granted Critical
Publication of US3761854A publication Critical patent/US3761854A/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
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/48—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having both electrothermal and electromagnetic automatic release
    • H01H73/50—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism having both electrothermal and electromagnetic automatic release reset by lever
    • 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
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/40—Combined electrothermal and electromagnetic mechanisms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B17/00—Surgical instruments, devices or methods
    • A61B17/56—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor
    • A61B17/58—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements
    • A61B17/60—Surgical instruments or methods for treatment of bones or joints; Devices specially adapted therefor for osteosynthesis, e.g. bone plates, screws or setting implements for external osteosynthesis, e.g. distractors, contractors
    • A61B17/66—Alignment, compression or distraction mechanisms

Definitions

  • ABSTRACT A circuit breaker provided with a thermal and electromagnetic element has two levers and two torsion springs.
  • the torsion springs are prestressed and exert on the levers oppositely-directed forces, whereby the force exerted bythe first torsion spring on the first lever is greater than the force exerted by the second torsion spring on the second lever.
  • the levers act as the force-transmitting members of the breaker.
  • the invention relates to the overcurrent release of an electric switch and more particularly, to a switch breaker.
  • the release devices of low-voltage circuit breakers have a thermal element, electromagnetic element, and a mechanism with a shaft in which a lever is rotatably mounted together with a torsion spring.
  • the lever is provided with a long and a short arm, the latter carrying a roller.
  • the torsion spring holds the long arm of the lever away from a boss on a movable rod.
  • a tooth of a lock-releasing lever presses the roller mounted in the short am of the lever with great force and rotates its lever in the direction opposite the bias of the torsion spring.
  • a drawback of this release device consists in that, the lock releasing lever, when disengaging, must overcome the force exerted by the torsion spring in order to shift the roller. This delays the disconnection of the circuit breaker.
  • the object of the invention is the development of such a circuit-breaker release mechanism which is capable of shortening the operating time of the circuit breaker and enables calibration of its mechanism without other parts of the circuit breaker.
  • the force exerted by the first torsion spring on the first lever is greater than the force exerted by the second torsion spring on the second lever.
  • the two levers are so situated and shaped that a long arm of the first lever rests on the boss of a movable rod, and the short arm of this lever has a length such that it is situated in the path of the circuit-breaker handle.
  • the second lever has a lug on its long arm, which is in the path of the long arm of the first lever.
  • FIG. I is a cross-section (taken along line l I of FIG. 3) of the release mechanism
  • FIG. 2 is a view of the release mechanism from the side (arrow ll of FIG. 1);
  • FIG. 3 is a sectional view (along Line III III of FIG. I) of the mechanism.
  • the switch or circuit breaker of the present invention comprises an insulating body (FIGS.1 3) which extends over the length of the housing 1' (FIGS.1 and 3) to which it is secured by screws 1" (FIGS! and 3).
  • Screws 2 attach a support 3 from below to the insulating body 1, the support 3 having a pair ofdownwardly extending legs 3' (FIGS.1 and 2) in which a shaft 4 (FIGS.] and 2) is mounted.
  • the shaft 4 carries two bent levers 5, 6 through which the shaft passes and which are independently rotatable on the shaft 4 as best seen in FIGSJ and 2.
  • a pair of torsion springs 7 and 8, likewise mounted on the shaft 4, have legs engageable with the levers 5 and 6, respectively, and other legs received in holes of the support 3 as will be apparent hereinafter so that a torque is applied by each spring to the respective lever.
  • leg 9 (FIGS.! and 2) of spring 7, for example, engages in a hole 11 of the support 3 (FIG.1) while the other leg 13 of the torsion spring 7 engages an arm 14 of the first lever 5, partly broken away in FIG.2.
  • a leg 10 (FIG.2) of the second spring 8 is received in a hole 12 of the support 3 while another leg 15 (FIG.2) rests on the short arm 28 of the second lever 6.
  • the torsion springs 7 and 8 are prestressed and exert counterdirected forces (about the shaft 4 as seen in I FIG.l) on the levers 5 and 6 such that the force applied by the torsion spring 7 to the first lever 5 is greater than the force applied by the torsion spring 8 to the second lever 6.
  • the first lever 5 has a long arm (FIGSJ and 2) which is provided at its free end (FIG.l with an arcuate portion 18 corresponding to the arc of a circle with a radius drawn from the axis of rotation of this lever, i.e. the axis of shaft 4.
  • the lever arm 17 is provided with an undercut l9 (FIG.l) limited by a segment which is tangential to the circle describing a boss 20 or pin (FIGSJ and 2) ofa movable trip bar 21 during its rotation.
  • the trip bar 21 (see especially FIGSJ and 3) is mounted by pivot arrangements 47' in a pair of trunnions rising from the plate 1 and best seen in FIG.3.
  • the trip bar 21 can swing about an axis parallel to the shaft 4 and perpendicular to the plane of the paper in FIG.1.
  • the short arm 22 of lever 5 (best seen in FIG.1) has a length such that it lies in the path along which a member 23 of a handle 24 of the circuit breaker is movable (FIGJ).
  • the circuit breaker handle has been removed to reveal the overlying structure as viewed in FIG.2.
  • the second lever 6 (FIGSJ and 2) has a long arm 25 on which is provided a lug 26 (FIG.1) in the path of the long arm 17 of lever 5 and is formed with an abutment 27 (FIG.1).
  • the lever 6 is also provided with a short arm 28 (FIGS.1 and 2) in which a roller 29 is fixed.
  • the roller 29 holds down a tooth 30 (FIG!) of lever 31, the latter forming a switch latch that releases the lock of the circuit breaker (see FIG.1).
  • thermal and electromagnetic elements On the other side of the insulating body 1 (i.e. above the body 1 there are provided three thermal and electromagnetic elements (FIG.3).
  • the thermal elements consist of thermal metal (bimetallic) strips 32 (FIG.1 a heater 33 (FIGSJ and 2) and an insulating pad 34 between two arms of the heater 33 and together with thermal metal strips 32 are permanently fixed to a frame 35 (FIGSJ and 3) by means of rivets 36 and rectangular pads 37 (FIGJ).
  • the bent arm 38 (FlG.1) of frame 35 carries a pilot sleeve 39 (FIGSJ and 3) at the end of which a pin 40 is mounted.
  • the armature 41 of the electromagnetic element is provided at the end of pin 40.
  • the armature 41 rests upon the bent arm 38 of frame 34 and is held in place by a coil spring 42 and a nut 43 threaded onto the threaded part of pin 40 (FIGSJ and 3).
  • a nut 44 is also provided on this pin 40.
  • the armature of the electromagnetic element is designed to act upon the trip bar 21 while exerting a pressure on the arm 45 of the rod (FIGJ).
  • Frame 35 and core 46 of the electromagnetic elements (FIGSJ and 3) are attached to the insulating body 1 via the screws 2 mentioned earlier (FIGSJ and 2).
  • a spring 48 (F161) is provided between the body 1 and the trip bar 21 to provide the restoring force when the latter is shifted.
  • the trip bar 21 (FIGSJ and 3) also is provided with a long bolt 49 and three short bolts 50, the long bolt 49 being used to position the movable rod with respect to the trip bar 21 (FIG.3).
  • the short bolts 50 are used to establish equal distances between bimetallic elements 32 and the closest part of the trip bar 21.
  • Bolts 49 and 50 are provided with locking nuts 51 and 52 to retain them after they have been set.
  • the shaft 4 is held between the legs 3' of the support 3 by means of split rings 16 (F162).
  • the torsion spring 7 then swings this arm in the opposite sense to its original displacement until the second lever 6 is entrained and the circuit breaker released.
  • the roller 29 is withdrawn from the path of the tooth 30 and the lever 31 is therefore permitted to rotate to release the lock.
  • the circuit breaker connections are interrupted.
  • a circuit breaker release mechanism comprising: a support;
  • first and second torsion springs acting upon said first and said second lever respectively in opposite senses and with a greater force on said first lever than the force on said second lever;
  • a rod mounted on said support for at least limited angular displacement about an axis, said rod being operatively connected to circuit-breaking means for opening and closing a circuit in accordance with the position of said rod;
  • a breaker resetting handle mounted on said support, one arm of said first lever engaging said rod and the other arm of said first lever lying in the path of said handle, one arm of said second lever lying on the path of said one arm of said first lever and the other arm of said second lever being provided with a roller cooperating with a switch latch of the breaker whereby said first spring is stressed upon actuation of said handle to bias said first lever against said rod and disengagement of said rod from said first lever effects displacement of said second lever to release said switch latch.
  • said one arm of said second lever is formed with a boss adapted to rest upon an abutment of said support, said latch including a latching lever controlled by said roller and having a tooth deflected thereby, said boss being so constructed and arranged that a straight line passes through the axis of said roller and the axis of said shaft when said boss engages said abutment and substantially coincides with the force-action line of said tooth upon said roller.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Push-Button Switches (AREA)
US00136749A 1970-04-30 1971-04-23 Overcurrent release of electric switch in particular of switch breaker Expired - Lifetime US3761854A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL140335A PL66930B1 (cs) 1970-04-30

Publications (1)

Publication Number Publication Date
US3761854A true US3761854A (en) 1973-09-25

Family

ID=19951613

Family Applications (1)

Application Number Title Priority Date Filing Date
US00136749A Expired - Lifetime US3761854A (en) 1970-04-30 1971-04-23 Overcurrent release of electric switch in particular of switch breaker

Country Status (11)

Country Link
US (1) US3761854A (cs)
BE (1) BE766374A (cs)
CS (1) CS174814B2 (cs)
DD (1) DD99259A1 (cs)
DE (1) DE2118032A1 (cs)
FR (1) FR2086499B3 (cs)
GB (1) GB1294050A (cs)
HU (1) HU168252B (cs)
RO (1) RO58446A (cs)
SU (1) SU466573A1 (cs)
TR (1) TR16893A (cs)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6672280B2 (en) 2001-03-09 2004-01-06 Visteon Global Technologies, Inc. Torsion spring assembly for electronic throttle

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3064101A (en) * 1958-12-08 1962-11-13 Ite Circuit Breaker Ltd Compounded thermal bimetal for ambient compensation
US3136921A (en) * 1957-12-10 1964-06-09 Westinghouse Electric Corp Circuit breakers
US3171929A (en) * 1962-12-31 1965-03-02 Gen Electric Circuit breaker with releasable cam type mechanism
US3185792A (en) * 1961-05-24 1965-05-25 Gen Electric Circuit breaker trip mechanism
US3244837A (en) * 1962-12-17 1966-04-05 Ite Circuit Breaker Ltd Heating means for bimetal trip element
US3345481A (en) * 1962-05-28 1967-10-03 Westinghouse Electric Corp Circuit interrupter
US3350525A (en) * 1965-01-25 1967-10-31 Gen Electric Circuit breaker resetting mechanism

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3136921A (en) * 1957-12-10 1964-06-09 Westinghouse Electric Corp Circuit breakers
US3064101A (en) * 1958-12-08 1962-11-13 Ite Circuit Breaker Ltd Compounded thermal bimetal for ambient compensation
US3185792A (en) * 1961-05-24 1965-05-25 Gen Electric Circuit breaker trip mechanism
US3345481A (en) * 1962-05-28 1967-10-03 Westinghouse Electric Corp Circuit interrupter
US3244837A (en) * 1962-12-17 1966-04-05 Ite Circuit Breaker Ltd Heating means for bimetal trip element
US3171929A (en) * 1962-12-31 1965-03-02 Gen Electric Circuit breaker with releasable cam type mechanism
US3350525A (en) * 1965-01-25 1967-10-31 Gen Electric Circuit breaker resetting mechanism

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6672280B2 (en) 2001-03-09 2004-01-06 Visteon Global Technologies, Inc. Torsion spring assembly for electronic throttle

Also Published As

Publication number Publication date
DE2118032A1 (de) 1971-12-02
RO58446A (cs) 1975-09-15
GB1294050A (en) 1972-10-25
BE766374A (fr) 1971-09-16
DD99259A1 (cs) 1973-07-20
SU466573A1 (ru) 1975-04-05
FR2086499A3 (cs) 1971-12-31
TR16893A (tr) 1973-09-01
CS174814B2 (cs) 1977-04-29
FR2086499B3 (cs) 1974-02-15
HU168252B (cs) 1976-03-28

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