EP0020312A1 - Disjoncteur monopolaire - Google Patents

Disjoncteur monopolaire Download PDF

Info

Publication number
EP0020312A1
EP0020312A1 EP80830032A EP80830032A EP0020312A1 EP 0020312 A1 EP0020312 A1 EP 0020312A1 EP 80830032 A EP80830032 A EP 80830032A EP 80830032 A EP80830032 A EP 80830032A EP 0020312 A1 EP0020312 A1 EP 0020312A1
Authority
EP
European Patent Office
Prior art keywords
movable contact
operating member
contact carrier
cradle
manual operating
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.)
Granted
Application number
EP80830032A
Other languages
German (de)
English (en)
Other versions
EP0020312B1 (fr
Inventor
Aldo Vescovi
Francesco Cravino
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.)
Bassani SpA
Bassani Ticino SpA
Original Assignee
Bassani SpA
Bassani Ticino SpA
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 Bassani SpA, Bassani Ticino SpA filed Critical Bassani SpA
Priority to AT80830032T priority Critical patent/ATE2982T1/de
Publication of EP0020312A1 publication Critical patent/EP0020312A1/fr
Application granted granted Critical
Publication of EP0020312B1 publication Critical patent/EP0020312B1/fr
Expired 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
    • H01H71/501—Means for breaking welded contacts; Indicating contact welding or other malfunction of the circuit breaker
    • 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
    • H01H71/503—Means for increasing the opening stroke of the contacts
    • 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
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/522—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism
    • H01H71/523—Manual reset mechanisms which may be also used for manual release actuated by lever comprising a cradle-mechanism the contact arm being pivoted on cradle and mechanism spring acting between handle and contact arm

Definitions

  • This invention relates to a sinqle-pole circuit breaker.
  • Single-pole circuit breakers are already known and are employed for protecting single phases of an electrical circuit against overload and short circuit current conditions.
  • said single-pole circuit breakers are installed one by one, or juxtaposed in a certain number, and interconnected so that the manual operation takes place simultaneously for all the circuit breakers as well as the automatic operation takes place simultaneous ly for all the juxtaposed circuit breakers, even when it occours an anomalous current condition in a single phase of the electric circuit.
  • a snap mechan ism comprising a manual operating member, a movable contact carrier, having one end fulcremed on said manual operating member and supporting on the other end the movable contact of the single pole circuit breaker, and a latchinq or set cradle for the automatic opening, said latching cradle being pivoted at one end on a stationary pin and having, at the other end, a tip designed to be latched to the latch aperture or notch of a trip lamina, said trip lamina being designed to disengage said latching cradle when an overload or a short circuit current condition occurs, a spring being interconnected between said movable contact carrier and said manual operating member, or between said movable cont act carrier and said latching cradle,and being designed to cooperate with the above mentioned members to define an over-center articulation for snapping the mechanism towards the open or close position and to supply the contact pressure between the movable and the stationary contacts.
  • the single-pole circuit breakers so conceived are installed in a great number both in home and in industrial electric wirings and are juxtaposed on suitable supports. Conseguently, the problem of the mass production of said single-pole circuit breakers and at low cost, as well as the problem of the diminution of their size even though the must assure the required intervention characteristic,arise.
  • the object of the present invention is to provide a single pole circuit breaker of the kind hereinbefore described that can be produced in a high series and that can be mechanically assembled so that, the labour may be reduced, furthermore a single-pole circuit breaker the mechanic components of which are designed and shaped such in a way that they may be easily produced only by simple blanking, without reguiring further machinings, and that are interconnected to contribute to the reduction of the encumbran ce of the circuit breaker still assuring the best interven tion chances, particularly, in the event of short-circuit current, assuring a sudden opening which cannot be obtained by the similar single-pole circuit breaker of the prior art.
  • the single-pole circuit breaker according to the present invention is characterized by a manual operating member havinq a flattened shape of reduced thickness, parallel to the flat walls of the moulded case and being outlined as a circular sector and having its apex shaped as a fork pivot ed on a fixed pin not projecting from the thickness of said circular sector, by a latching cradle having a flattened shape as well and being pivoted such in a way that it may be superimposed and it may run over said manual operating member, said latching cradle carrying in its middle port ion a pin projecting in the direction away from the manual operating member, by a movable contact carrier having a portion remote form the movable contact which is also flattened and is provided with an end shaped as a fork, pivoted on the pin carried by the latching cradle, so that said manual operating member, said latching cradle and said movable contact carriar are partially superimposed one with respect to the other in the direction of the
  • the single-pole circuit breaker is characterized by a relief provided on a side of sai.d manual operating member, projec ting from the surface thereof facing the latching cradle and by an appendix projecting outwards said latching cradle said appendix generating a recess with the outer edge of the latching cradle, said recess being engaged by said relief to limit the tripping movement of the latching crad le when an automatic opening takes place, the engagement and the runninq of said relief along the edge of said append ix serving to drive said latching cradle in the latched pos ition when the manual operating member is operated to reset the circuit breaker.
  • the single-pole circuit breaker s characterized by the fact that the movable contact carrier is provided with an ending portion, carrying the movable contact, having an arcuate shape, with the convex edge remote from the stationary contact, said convex edge ending with a projecting straigth edge, while a shoulder rising from the wall of the moulded case is provided opposite said convex edge, so that, in condition of manual opening, said convex edge abuts against said shoulder, while, in condition of automatic opening, said straigth edge abuts against the shoulder because of a composite movement due to the movement of the movable cont act carrier around its pivoting pin and to the movement of the latching cradie so that, in the latter condition, the spacement between the stationary and the movable contacts is increased.
  • the single-pole circuit breaker is characterized by the fact that said arcuate portion of the movable contact carrier is provided with an inner end projecting towards the pivot ing pin of the latching cradle while the nearer end of the latching cradle is provided with a projection designed to interfere with said inner end of the arcuate portion during the automatic opening and in the event the fixed and the movable contacts get welded together, said interference caus ing the detachement of the movable contact and avoiding the rebound of the latter towards the stationary contact.
  • the single-pole circuit breaker is contained in a moul ded case composed by a bottom she11 1 and a covering shell 2 coupling along an edge 3, the covering shell 2 having a depth lesser that the depth of the bottom shell 1 and being removed in fig. 1-2-3-4.
  • Said moulded case is produced by moulding shells 1 and 2, preferably in a insulating mat erial that cannot be deformed in condition of overheating and cannot be scored by the sparkinq of the contacts, such as dicyanamide or aldehyde resins and the like.
  • the bottom shell 1 shows a peripheral wall 4 higher than the wall of the covering shell 2 and is provided with a bottom wall 5 from which pins, ribs or seats project and that are obtained by being moulded integral with the bot tom shell and that will be recited from time to time in the specification.
  • the moulded case on one of its sides is provided with an opening 6 through which the handle 7 of the manual operat- inq member 8 does pass, the latter having a flattened shape of reduced thickness and outlined as a circular sector.
  • the arcuate edge of the operating member 8 is limited by an arcuate wall 9 the arc amplitude of which does close the opening 6 in every position of the manual operating member
  • Said manual operating member 8 is provided at it apex with a fork 10, having an arcuate bottom and engaging a pin 11 rising from the bottom wall 5, so that the manual operating member 8 may swing around the pin 11 and may be easily mounted mechanically, thus avoiding the centering problems.
  • a latching cradle 12 runs, said latching cradle having an end 13 provided with a hole through which it may be pivoted on a pin 14 projecting from the bottom wall 5.
  • the same end 13 is provided with a projection 15 designed to constitute a thrust member for the movable contact carrier in a way that will be specified hereinafter.
  • the other end 16 of the latching cradle 12 ends with a tip 17 designed to be latched on the upper edge of an opening 18 provided on a trip lamina 19.
  • Said trip lamina 19 has its upper end accomodated in a seat 20 provided at the peripheral portion of the bottom shell 1.
  • trip lamina 19 is connected to a bimetallic lamina 23 by means of a calibration screw 22, the head of the latter being accessible through an opening 22'.
  • the trip lamina 19, near its and 21 holds up a movable armature 24 of magnetizable iron, which has the shape of a plate of proper thikness.
  • this arrangement allows the tripping i of the tip 17 by displacement of the trip 1 amina 19 either in the event of an overload current that by heating the bimetallic lamina 23, causes the bending of the 1 alter and the pulling of the trip lamina 19, or in the event of a short circuit current that causes the sudden attraction of the armature 24 towards the bimetallic lamina 23.
  • the bimetallic lamina 23 is electrically connected to a terminal 25, to which an external conductor is fixed, the connection beinq realized throught a riqid conductor 26 having one of its ends connected to the upper end 27 of the bimetallic lamina.
  • the other end 28 of the bimetallic lamina 23 is electrically connected to a movable contact carrier 29 through a flexible conductor 30.
  • the latchinq cradle 12 in its middle portion, is provided with an appendix 31 projecting outward, said appendix def- ininq a recess 32 with the outer edge of the same latching cradle.
  • a relief 33 projects near the edge of the manual operating member 8 end from the surface facing the latching cradle 12, said relief being shaped as a circular sector and being designed to interfere with the appendix 31 and the recess 32 alternaatively in a way that will be descrihed hereinafter.
  • An arm 34 is provided after the arcuate portion of the mov able contact carrier 29, said arm 34 having the distal end shaped as a fork 35 the bottom of said fork being arc uated, so that the fork may be pivotable on a pin 36 prov ided in the middle portion of the latching cradle 12.
  • the movable contact carrier 29 carries a movable contact 37 designed to get in touch with a stationary contact 38, carried by a stationary contact carrier 39 integral with a terminal 40 to a which a second exterior conductor is fixed.
  • the movable contact carrier 29 can be of the kind carrying two juxtaposed movable contacts designed to touch two corresponding stationary contacts according to the known art.
  • An arcuate spring 41 is connected between the manual oper- atinq member 8 and the movable contact carrier 29 and its function is to bias the movable contact carrier towards the manual operating member 8.
  • Said arcuate spring 41 is constituted by a spring steel bar and is bent at its upper end, as to provide a pivoting pin in a hole 42 of the manual operating member 8 and it is also ben at its lower end to provide a pivotinq pin in a hole 43 of the movable contact carrier 29.
  • the manual operating member 8 the latching cradle 12 and the arm 34 of the movable contact carrier 29 are all Flattened members of reduced thikness so that they do not reg rind specific machinings, therefore they may be produced at a low cost.
  • said members are partially oven apped one on top of the other, the encumbrance of the whole over-center snapping mechanish being reduced with respect to the mechanisms of the known art.
  • said members comprising the arcuate spring 41, are connec ted such in a way that the may be easily assembled mechanically without relevant centering problems of the pins.
  • pivoting pin 11 of the manual operating member 8 and the pivoting pin 36 of the movable contact carrier 29 are disposed between the ending pins of the arcuate sprinq 41 so that in the closed position they are both on one side of the line passing through the ending pins of the spring 41while in the open position, both automatic and manual, they are disposed on the opposite side of said line.
  • this arrangement supplies a bias to the latching cradle 12, said bias at the tripping moment makes the latching cradle move upward, i.e. towards the manual operating member 8.
  • Fig. 2 shows the circuit t breaker in the manually open condition reached by moving the manual operating member 8 by means of the handle 7.
  • the swinging of the manual operating member H causes the displacement of the hole 42 so that as soon as the line joinig holes 42 and 43 has passed over the pin 36, corresponding to the over-center position, the movable contact carrier snaps in the open position rotating around said pin 36 that remains stationary with the latching cradle 12.
  • the convex edge of the arcuate portion of the movable cont act carrier 29 interferes with a shoulder 44 provided by a web rising from the bottom wall 5, as to limit the opening path of the contact 37 with respect to the stationary contacts 38.
  • Fig. 3 shows the single pole circuit breaker in the automat ic open condition, as a consequence of an overload or of short circuit current.
  • the latching cradle 12 is released by the trip lamina 19 and, because of the bias possessedd by the movable contact carrier 29, it rotates upward i.e. towards the handle 7.
  • the pin 36 is conseguently dispidced from the right side on the line connecting holes 42 and 43 (fiq.1) to the left side of said line (fig.3) causing the snap opening of the movable contact carrier 29 as soon as it passes beyond the over center (fiq.3).
  • the movable contact carrier not only does rotate aruound the pin 36, but it follows the upward displac ement of said pin.
  • the spring 41 has caused the displacement of the manual operating member 8 to an intermediate position, as shown in fiq.3, said intermediate position being determined by the interference of the relief 33 with the recess 32.
  • the handle 7 of the manual operating member 8 is initially displaced toward the right side (i.e. towards the manual open position), consequently the latching cradle 12 moves because of the interference betweer the relief 33 and the recess 32 until the tip 17 or the latching cradle 12 is engaged by the hole 18 of the trip lamina 19, reaching the position of fiq.2,
  • circuit t breaker may be operated in the "on" position displacing the manual operating member 8 towards its closed position, reaching the condition of fig.1.
  • Fig.4 is related to a condition that may occur in case of automatic opening.
  • the projection 15, carried by the end 13 of the latching cradle 12, has the aim to cause the detachement of the movable contact 37 from the stationary contact 38 and the return stroke of the movable contact carrier to the close position.

Landscapes

  • Breakers (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Relay Circuits (AREA)
  • Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
  • Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
  • Surgical Instruments (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Use Of Switch Circuits For Exchanges And Methods Of Control Of Multiplex Exchanges (AREA)
  • Transmitters (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Push-Button Switches (AREA)
EP80830032A 1979-06-01 1980-05-27 Disjoncteur monopolaire Expired EP0020312B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT80830032T ATE2982T1 (de) 1979-06-01 1980-05-27 Einpoliger schutzschalter.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT23210/79A IT1121759B (it) 1979-06-01 1979-06-01 Interruttore automatico unipolare
IT2321079 1979-06-01

Publications (2)

Publication Number Publication Date
EP0020312A1 true EP0020312A1 (fr) 1980-12-10
EP0020312B1 EP0020312B1 (fr) 1983-04-06

Family

ID=11204913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP80830032A Expired EP0020312B1 (fr) 1979-06-01 1980-05-27 Disjoncteur monopolaire

Country Status (7)

Country Link
EP (1) EP0020312B1 (fr)
AT (1) ATE2982T1 (fr)
BR (1) BR8002196A (fr)
DE (1) DE3062602D1 (fr)
ES (1) ES489020A0 (fr)
IT (1) IT1121759B (fr)
MX (1) MX148216A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408466A2 (fr) * 1989-07-11 1991-01-16 Merlin Gerin Mécanisme de commande pour disjoncteur électrique

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152232A (en) * 1960-02-29 1964-10-06 Ite Circuit Breaker Ltd Circuit breaker having bimetal rigidly secured to cradle
GB1056132A (en) * 1963-02-07 1967-01-25 Terasaki Denki Sangyo Kk Electrical circuit interrupter
US3466578A (en) * 1967-06-26 1969-09-09 Ite Imperial Corp Circuit breaker contact separation initiator
US3818168A (en) * 1972-12-01 1974-06-18 Gen Switch Co Latch mechanism for toggle actuated circuit breaker
US3849748A (en) * 1973-12-04 1974-11-19 Ite Circuit Breaker Ltd Small circuit breaker having large contact separation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3152232A (en) * 1960-02-29 1964-10-06 Ite Circuit Breaker Ltd Circuit breaker having bimetal rigidly secured to cradle
GB1056132A (en) * 1963-02-07 1967-01-25 Terasaki Denki Sangyo Kk Electrical circuit interrupter
US3466578A (en) * 1967-06-26 1969-09-09 Ite Imperial Corp Circuit breaker contact separation initiator
US3818168A (en) * 1972-12-01 1974-06-18 Gen Switch Co Latch mechanism for toggle actuated circuit breaker
FR2209202A1 (fr) * 1972-12-01 1974-06-28 Gen Switch Corp
US3849748A (en) * 1973-12-04 1974-11-19 Ite Circuit Breaker Ltd Small circuit breaker having large contact separation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0408466A2 (fr) * 1989-07-11 1991-01-16 Merlin Gerin Mécanisme de commande pour disjoncteur électrique
FR2649826A1 (fr) * 1989-07-11 1991-01-18 Merlin Gerin Mecanisme de commande pour disjoncteur electrique
EP0408466A3 (en) * 1989-07-11 1991-03-27 Merlin Gerin Operating mechanism for an electric switch

Also Published As

Publication number Publication date
MX148216A (es) 1983-03-25
ES8103466A1 (es) 1981-02-16
IT1121759B (it) 1986-04-23
ATE2982T1 (de) 1983-04-15
BR8002196A (pt) 1980-12-30
DE3062602D1 (en) 1983-05-11
ES489020A0 (es) 1981-02-16
IT7923210A0 (it) 1979-06-01
EP0020312B1 (fr) 1983-04-06

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