US3686602A - Miniaturized circuit-breaker switch - Google Patents

Miniaturized circuit-breaker switch Download PDF

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Publication number
US3686602A
US3686602A US89375A US3686602DA US3686602A US 3686602 A US3686602 A US 3686602A US 89375 A US89375 A US 89375A US 3686602D A US3686602D A US 3686602DA US 3686602 A US3686602 A US 3686602A
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United States
Prior art keywords
pin
casing
movable
button
insulating
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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
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US89375A
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English (en)
Inventor
Jean Jullien-Davin
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.)
Thales Avionics SAS
Original Assignee
Crouzet SA
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Filing date
Publication date
Application filed by Crouzet SA filed Critical Crouzet SA
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Publication of US3686602A publication Critical patent/US3686602A/en
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    • 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
    • H01H73/22—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 electrothermal release and no other automatic release
    • H01H73/30—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 electrothermal release and no other automatic release reset by push-button, pull-knob or slide

Definitions

  • a single-pole circuit-breaker switch for manual operation andfree tripping comprising an insulating casing containing two stationary contacts and having a handoperated closure push-button slidably fitted within the said casing and projecting therefrom, the said switch comprising means for retaining the said push-button in the depressed position, a frame which is movable within the casing and carries on the one hand two movable contacts which are capable of cooperating with the stationary contacts and are connected to each other by means of a U-shaped thermostatic element which has two arms connected to the movable contacts and the deformation of which causes tripping of the switch involving return of the sliding frame and v push-button to the opening position and on the other hand locking means and means for releasing the movable
  • This invention is directed to a single-pole circuitbreaker switch of small overall size which is intended to be actuated by hand as a push-pull" switch and is designed on the free-tripping principle.
  • a free-tripping device is understood to designate a device which is capable of opening its circuit in the presence of an overload current even in the event that the control means are maintained in the closed position for any indeterminate reason.
  • the circuit-breaker switch in accordance with this invention comprises means responsive to the overload groove in the lower portion thereof; a movable frame constituted by two symmetrical right-angle brackets which are assembled by means of two spacer members and one of said members being provided with an internally threaded bore which is oriented in the axial direction, said assembly being guided 'vertically by means of a lug formed in the flange of eachright-angle bracket and housed within an axial groove formed in the corresponding half-casing; an operating arm formed of two superposed side-plates which are joined together at each'end by means of a cross-pin, the upper cross-pin which is engaged in the inclined groove of the blade being adapted to cooperate with a guide and a plate so that the arm aforesaid can be maintainedin the bottom position whilst the lower cross-pin (actuating pin) whose extremities are engaged in a double-slope groove formed in each cheek of the movable frame is capable according to the position occupied by said cross-pin in said groove.
  • a latch which is pivotally mounted on a pin carried by the cheeks of the movable frame and provided on one side of said pin witha recess whose angular position governs the position of the actuatingpin;
  • a trip lever pivotally mounted on a pin carried by the checks of the movable frame and provided with a nose in cooperating relation with the latch in order that said latch should be either capable or not capable of carrying out a pivotal movement according to the position of said nose and consequently of releasing or retaining the actuating pin; an insulating contact-holder for supporting two flexible S-shaped strips each adapted to carry at the lower end thereof a movable contact which is intended to cooperate with the corresponding stationary contact; a thermostatic element constituted by a U- shaped bimetallic strip which surrounds the movable frame and is connected to the upper extremity of each flexible strip so as to produce action by means of an
  • FIG. 1 is a sectional view of the apparatus in the joint plane of'the casing
  • FIG. 2 is a partial sectional view taken along line II- II of FIG. 1;
  • FIG. 3 is a sectional view taken along line IIIIII of FIG. 1;
  • FIG. 4 is a sectional view taken along line IV-IV of FIG.
  • FIG. 5 is a part-sectional view in elevation in the closed position, assuming that the front half-casing has been removed;
  • FIG. 6 is a sectional view which is similar to FIG. 1,
  • the circuitbreaker switch according to the invention comprises:
  • a casing of. molded insulating material formed of two identical hollowed-out components 1 which are assembled by means of rivets fitted within holes la.
  • a pair of terminals 2 each carrying a stationary contact 2a and engaged in grooves lb, 1c, said grooves being formed in the bottom portion of the half-casing and maintained at a distance from each other by means of a positioning member 3 of molded insulating material.
  • a guide sleeve 4 which is inserted in the top portion of the casing'and has a threaded portion so that the apparatus can be attached to a panel by means of a nut.
  • Said sleeve is stationarily fixed in the axial direction by means of a metallic plate 5 which is in turn secured to the casing by means of four lugs 5a which are folded back and provided with drilled holes, said lugs being set in recesses 1d of the casing; in addition, said sleeve is stationarily fixed angularly by means of diametrically opposite flat portions 4a formed on the annular shoulder 4a (as also shown in FIG. 3).
  • a groove 4b of small width permits a local reduction in thickness of the wall as well as the possibility of forming a projecting key 4c as a result of a punching operation.
  • a control push-button constituted by the assembly of three components 6, 7, 8 of molded insulating material, the colors of said components as given by way of example being red in the case of the pushbutton 6 proper, green in the case of the component 7, white in the case of the washer 8.
  • the purpose of this difference in color is to provide a visual display of the state of operation of the apparatus.
  • a groove 7a in which the key 4c is engaged serves to guide said push-button within the sleeve 4.
  • an operating blade 9 of cut-out sheet metal the top portion of which is engaged in the component 7 and locked in position with respect to this latter by means of a locking-pin l0.
  • Said blade is disposed vided at the lower end with an inclined groove 9a.
  • a movable frame formed of two symmetrical rightangle brackets 11 which are constructed of bent FIG. 4) is fixed on the frame by means of two rivets 13c and has an axial channel 13a and an internally threaded bore 13b.
  • the flange 11a (shown in FIG. 2) is provided with a lug 11b which is formed at the time of cutting-out and is intended to fit within an axial groove 1e of the corresponding half-casing in order to ensure vertical guiding;
  • the cheek lie is provided with a groove 1 1d having a double slope and a swan-necked zone 1 1e.
  • a retaining-pin guide 17 formed of molded insulating material and a retaining plate 18 formed of cut-out sheet metal, these two components being juxtaposed beneath the guide sleeve 4 and suitably positioned within the casing by virtue of their octogonal shape.
  • said assembly has a central opening 17a, 18a which permitsthe passage of the operating blade and arm 9, 14 but does not permit the passage of the retaining cross-pin 15; there is also located on each side of said opening a skew section or ramp 17b which terminates in a recess 17c, 180 through which the retaining pin 15 is capable of passing.
  • alatch 20 of cut-out sheet metal which is pivotally mounted on a pin 21 carried by the cheeks of a trip lever 22 of cut-out sheet metal and pivotally mounted on a pin 23 which is carried by the checks of the movable frame and centered with respect to said checks by means of two washers 24.
  • Said lever is provided with a heel 22b which is ap plied under the action of a loop-spring 25 against an insulating stud 26.
  • Said stud is rigidly fixed to athermostatic element 27 which, depending on the position in which it is located, determines the angular position of the retaining nose 22a which is then either in cooperating relation or not with the bearing nose 28a of the latch 20 (as shown in FIGS. 5 and 6).
  • an insulating contact-holder 28 formed of a base member 28a which isen gaged within the swannecked zone 112 of the movable frame and of two side-plates 28b which are applied respectively against the external faces of the cheeks of the movable frame.
  • Said plate 29 is of cruciform design and is provided on the one hand with two projecting lugs 290 formed by cutting-out from the sheet metal and .adapted to engage respectively in the axial guiding grooves 1e of the casing and on the other handwith a pintle 30 for centering a spring 31 which I is housed axially within the positioning unit 3 and produces elastic restoring action on the movable frame (as shown in FIGS. 2and3).
  • each flexible strip is adapted to carry a movable contact-stud 32a which is located opposite to the corresponding stationary contactstud 2a.
  • thermostatic element 27 constituted by a U-shaped bimetallic strip which surrounds the movable frame, the extremities of said element being joined respectively to the upper extremities of the flexible strips 32 in order to constitute a direct electrical circuit.
  • said bimetallic strips 34 are each clamped at the points of assembly of thermostatic element and flexible strips by means of a rivet 35, for example.
  • said bimetallic strips are coupled mechanically by clamping between two small insulating plates'36, 37 which are both provided with a slight concavity in their bearing zones (as shown in FIG. 5) in order to permit the possibility of thermal deformation of said strips.
  • the upper insulating plate 36 is also provided with a shouldered portion 36a in order to maintain the strips in spaced relation.
  • the retaining cross-pin 15 which is urged towards the Lefthand side by the radial force component arising from the inclination of the groove 9a accordingly reacts with the lateral ramps 17b, passes through the lateral recesses 17c, 18c, then slides beneath the retaining plate 18 and is prevented by this latter from returning upwards.
  • the actuating pin 16 begins to react with the retaining heel 20b of the latch 20 and causes the pivotal movement of this latter until its nose 20a is applied against the nose 22a of the triplever 22. While continuing to be retained by the heel 20b said actuating pin produces action on the movable frame 1 1 and imparts a downward movement to this latter.
  • the second trip-out stage is carried out by virtue of the spring 19 which initiates the upward movement of the operating blade 9 and consequently has the effect of displacing the retaining cross-pin 15 towards the lateral recesses l7c-18c, thereby causing the elastic return of the control push-button and of the operating arm 9.
  • the apparatus can have optimum sensitivity as a function of the maximum permissible im pact.
  • a single-pole circuit-breaker switch for manual operation and free tripping of the type comprising an insulating casing, two stationary contacts disposed in said casing, a hand-operated closure push-button slidably fitted within said casing and projecting therefrom, means for retaining said push-button in a depressed position, two movable contact means cooperating with said stationary contacts, and connected one to the other through the two arms of a U-shaped thermostatic element means, and elastic restoring means for returning the movable parts in the opening position at the time of operation of releasing means controlled by said thermostatic element, the improvement which consists in that said movable contact metrical right-angle brackets of cut-out and folded sheet metal to form flanges, said brackets being disposed in'the fon'n of a T and assembled by means of two spacer members; one of the spacer members being provided with a central internally threaded bore oriented in the axial direction, a lug means which is formed on each flange-of the right-
  • said operating blace whereby axial 'force exerted on the blade applies a radial force component to said upper cross-pin, and wherein the extremities of said lower cross-pin are engaged in a double-slope groove provided in each bracket of the movable frame, saidlower cross-pin defining an actuating pin; an insulating guide for the retaining pin and a retaining plate means which are juxtaposed and stationarily fixed beneath the guide sleeve and forming an assembly having a central opening of dimensions permitting thepassage of the operating blade'and operating arm and preventing the passage of the retaining pin, a ramp disposed on each side of the means are carried by a frame slidably moving within said casing, said frame being linked to said push-button through a pivoting connection member, said frame being lockable by a lock acting on said connection member during the time of depression of said push-button, vsaid thermostatic element contacting a pivoting lever arranged so as to release saidlock at the time of deformation of the said thermostatic
  • said insulating casing comprises two identical hollowed-out shells having an axial and a lower groove, and wherein said two stationary contacts respectively engage in said lower groove of the casing shells, an insulating positioning unit for maintaining said contacts in spaced relation; a guide sleeve rigidly fixed to a top portion of the casing and having a threaded portion thereon whereby the apparatus can be attached to a panel by means of a nut; said control push-button being formed of three assembled insulating components which are at least partially housed and guided within said guide sleeve; an operating blade attached to and extending below the base of the control push-button, said blade having an inclined groove in the lower portion thereof; said movable frame comprising two symopining and terminating -in a recess, wherein said locking means comprises a latch pivotally disposed about-a pin carried by the brackets of the movable frame, said latch being provided on one side of said pin with a
  • thermostatic element being constituted by a U-shaped bimetallic strip surrounding the movable frame for producing action on the heel of the trip lever, wherein the two arms of the U are respectively joined to upper extremities of the flexible strips for providing a direct electric circuit; an element means for providing compensation for ambient temperature constituted by two identical bimetallic strips having a double elbow with one extremity of each strip being clamped at a point of assembly of said thermostatic element and flexible strips and with the other extremity being mechanically clamped between two small insulating plates for producing action on the thermostatic ele- 3.
  • a single-pole circuit-breaker switch according to claim 5, wherein the force which is applied at the point of contact between the nose of the latch and the nose of the trip lever is directed towards the pin on which the trip lever is pivotally mounted and wherein the distance between the point of engagement and the pivotal axis of the latch is equal at the maximum to the distance between the said axis and the point at which the reaction is applied between the actuating pin and the retaining heel.

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  • Thermally Actuated Switches (AREA)
  • Push-Button Switches (AREA)
  • Breakers (AREA)
US89375A 1969-11-20 1970-11-13 Miniaturized circuit-breaker switch Expired - Lifetime US3686602A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR6940323A FR2067954A5 (de) 1969-11-20 1969-11-20
US8937570A 1970-11-13 1970-11-13

Publications (1)

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US3686602A true US3686602A (en) 1972-08-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
US89375A Expired - Lifetime US3686602A (en) 1969-11-20 1970-11-13 Miniaturized circuit-breaker switch

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US (1) US3686602A (de)
DE (1) DE2056446C3 (de)
FR (1) FR2067954A5 (de)
GB (1) GB1329752A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4315233A (en) * 1979-04-11 1982-02-09 Siemens Aktiengesellschaft Device for shifting a double-throw contact arrangement
US4814738A (en) * 1986-10-02 1989-03-21 Ellenberger & Poensgen Gmbh Overload protection switch
US6229426B1 (en) * 1999-10-25 2001-05-08 Texas Instruments Incorporated Circuit breaker having selected ambient temperature sensitivity
US6617952B1 (en) * 2002-02-26 2003-09-09 Tsung-Mou Yu Switch with adjustable spring

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19959339A1 (de) * 1999-12-09 2001-06-21 Ellenberger & Poensgen Elektrisches Funktionsgerät, insbesondere Schutzschalter, zum Einsatz in der Luftfahrt

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042776A (en) * 1959-09-16 1962-07-03 Texas Instruments Inc Electrical switches
US3210501A (en) * 1963-04-08 1965-10-05 Texas Instruments Inc Electrical switches with improved mechanical latching and resetting means
US3456225A (en) * 1967-02-22 1969-07-15 Ellenberger & Poensgen Pushbutton actuated overload circuit breaker

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3042776A (en) * 1959-09-16 1962-07-03 Texas Instruments Inc Electrical switches
US3210501A (en) * 1963-04-08 1965-10-05 Texas Instruments Inc Electrical switches with improved mechanical latching and resetting means
US3456225A (en) * 1967-02-22 1969-07-15 Ellenberger & Poensgen Pushbutton actuated overload circuit breaker

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4315233A (en) * 1979-04-11 1982-02-09 Siemens Aktiengesellschaft Device for shifting a double-throw contact arrangement
US4814738A (en) * 1986-10-02 1989-03-21 Ellenberger & Poensgen Gmbh Overload protection switch
US6229426B1 (en) * 1999-10-25 2001-05-08 Texas Instruments Incorporated Circuit breaker having selected ambient temperature sensitivity
US6617952B1 (en) * 2002-02-26 2003-09-09 Tsung-Mou Yu Switch with adjustable spring

Also Published As

Publication number Publication date
GB1329752A (en) 1973-09-12
DE2056446C3 (de) 1979-12-06
DE2056446A1 (de) 1971-05-27
FR2067954A5 (de) 1971-08-20
DE2056446B2 (de) 1979-04-19

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