EP0801408A2 - Dispositif de commutation de surcharge pour appareils électriques - Google Patents

Dispositif de commutation de surcharge pour appareils électriques Download PDF

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Publication number
EP0801408A2
EP0801408A2 EP97103619A EP97103619A EP0801408A2 EP 0801408 A2 EP0801408 A2 EP 0801408A2 EP 97103619 A EP97103619 A EP 97103619A EP 97103619 A EP97103619 A EP 97103619A EP 0801408 A2 EP0801408 A2 EP 0801408A2
Authority
EP
European Patent Office
Prior art keywords
connection contact
piece
cover cap
heating element
switching device
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
EP97103619A
Other languages
German (de)
English (en)
Other versions
EP0801408B1 (fr
EP0801408A3 (fr
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.)
Lectra Trading AG
Original Assignee
Lectra Trading AG
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 Lectra Trading AG filed Critical Lectra Trading AG
Publication of EP0801408A2 publication Critical patent/EP0801408A2/fr
Publication of EP0801408A3 publication Critical patent/EP0801408A3/fr
Application granted granted Critical
Publication of EP0801408B1 publication Critical patent/EP0801408B1/fr
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
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H37/5409—Bistable switches; Resetting means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/504—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by thermal means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/16—Indicators for switching condition, e.g. "on" or "off"
    • H01H9/161—Indicators for switching condition, e.g. "on" or "off" comprising light emitting elements

Definitions

  • the invention relates to an overload switching device for electrical devices, in particular cable drums, with at least one pair of connection contact members arranged at an interruption distance and a bimetallic piece which, when heated from a cold position in which the interruption distance is bridged in an electrically conductive manner, when a switching temperature is exceeded in one Bridging overriding warm position deformed, the two connection contact members being electrically connected to one another via an electrical heating element and an electrical lighting element, of which the heating element in the area of the bimetallic piece and the lighting element are covered by a cover cap made of translucent material, which, when installed in the electrical device, of is visible and accessible from the outside.
  • overload switching device is apparent from DE-OS 38 02 647. It serves to protect electrical consumers against overheating and can be used for different Most electrical devices are used. Special areas of application are in cable drums, electrical distributors and sometimes also in cables for the supply of electrical devices.
  • the overload switching device lies with its connection contact members in the circuit of the at least one consumer to be monitored. If the overload and thus the temperature becomes too high and this exceeds a switching temperature, the bimetal piece responds so that it reaches its warm position and the connection contact elements in the power supply of the consumer are electrically separated from one another. As a result, the power supply to the consumer is interrupted.
  • the heating element connected in parallel to the interruption distance is present in the known overload switching device.
  • This heating element is ineffective when the bimetallic switch is closed, ie when the interruption distance between the connection contact members is bridged immediately, since it experiences no or at most minimal heating.
  • the bimetallic switch opens, so that the direct passage of current is interrupted, the current flow only takes place via the heating element, which is designed to be so high-resistance that the supply voltage largely drops across it and the remaining low voltage drop at the consumer does not lead to a malfunction of the latter can lead.
  • the heating element heats up so quickly in a short time that the bimetal piece remains in its warm position and the direct power supply to the consumer is thus interrupted. Only when the consumer is disconnected from the mains, ie when the consumer is switched off or his mains plug or for example the mains plug of the cable drum is pulled out, does the heating element and thus the bimetal piece cool down.
  • the overload switch device is also a parallel to the interruption distance between the connection contact elements, there is a light element that is effective and lights up the heating element accordingly in the event of a fault, which indicates that the direct connection between the connection contact elements is interrupted, so that the user who Illuminated element sees, knows that excessive current or overheating was the cause for switching off the electrical device. Without this lighting element, the user would be unclear as to why the electrical device has gone out, since the device may also be defective or another fuse may have triggered.
  • the bimetal piece After the consumer has disconnected the heating element and with it the bimetal piece has cooled, in the known arrangement the bimetal piece deforms automatically back into its cold position, so that the direct power supply of the consumer is automatically restored. At the same time, the light element goes out.
  • the present invention is therefore based on the object to provide an overload switching device of the type mentioned, in which, while maintaining the advantages of the known device after a fault, switching back to direct current passage requires manual operation. This should be achieved with as little effort as possible.
  • the bimetallic piece remains in its warm position regardless of the temperature and can be deformed by the action of a mechanical switching force from its warm position into the cold position when the switching temperature is undershot, and that the cover cap of the light element can be pressed in with a push button and with one in the area of the bimetallic piece is provided which engages when the cap is pressed onto the bimetallic piece and exerts the switching force thereon.
  • the bimetallic piece is so shaped and designed that it remains in this position after its automatic deformation from the cold position to the warm position, even if the temperature drops again to a value below the switching temperature. It is therefore not only necessary to pull the power plug or the like to disconnect the consumer from the power supply, but also to operate it manually, namely by pushing in the cover cap, so that the bimetal piece is adjusted to its cold position by mechanical force.
  • the cap to be pressed in is not a separate push button, but rather the part covering the lighting element, which therefore has a double function, which reduces the manufacturing outlay and simplifies the assembly on the electrical device.
  • the overload switching device shown in the drawing has a switch housing 1, which in the exemplary embodiment is divided into two in the sectional plane of the drawing, so that the surfaces of the switch housing lying in the plane of the drawing are unshaded.
  • This housing 1 contains the for Function of the overload switch device required individual parts.
  • the overload switching device is fixed to a wall 2 of an electrical device, for example a cable drum. It is provided in the exemplary embodiment that the device wall 2 has a through opening 3 through which a sleeve-like holding part 4 is inserted from the outside during assembly until an outer annular collar 5 of the holding part 4 comes into contact with the device wall 2.
  • the holding part 4 has, on its area facing away from the annular collar 5, latching fingers 6 distributed over the circumference, which are inserted through the through opening 3 and have latching projections 7 projecting radially outward at their end.
  • the distance between the annular collar 5 and the locking projections 7 corresponds to the axial length of the through opening 3 or the housing part 8 surrounding it, plus the thickness of an end locking projection 9 of the switch housing 1.
  • the switch housing With its circumferential, radially inwardly projecting locking projection 9 held from the inside of the device against the housing part 8, after which the holding part 4 is inserted, the latching projections 7 initially elastically deflecting radially inwards until they come behind the locking projection 9 and spring there again radially outward, so that the locking projection 9 engages behind and the switch housing 1 is locked with the holding part 4. In this way, the switch housing is held on the device wall 2 at the same time, since the locking projection 9 is located between the locking projections 7 and the housing section 8.
  • the inside diameter of the locking projection 9 essentially corresponds to the inside diameter of the through opening 3.
  • the arrangement could also be made differently in detail.
  • the option shown is very easy to assemble since it does not require any tools.
  • the switch housing 1 contains the various switch parts, which will be discussed below.
  • the switch housing 1 initially contains a pair of electrically conductive connection contact members 10, 11 which are inserted into suitable housing recesses and each form a connection part 10a, 11a protruding from the housing 1, which serve to connect the electrical supply line which is to be secured with the overload switch device electrical consumers powered.
  • the network-side part is connected to the one connection contact element and the consumer-side part of the supply line to the other connection contact element.
  • the two connection contact members 10, 11 are arranged in the interior of the switch housing 1 at an interruption distance from one another and here form a contact point 10b or 11b.
  • a bimetal piece 12 is present in the housing 1, which in the drawing has its cold position assumed at room temperature, in which the interruption distance 13 between the connection contact members 10, 11 is bridged in an electrically conductive manner.
  • a bridge member 14 made of electrically conductive material is used for this purpose, which is arranged on the side of the terminal contact members 10, 11 facing away from the bimetal piece 12 and is spring-loaded towards the contact points 10b, 11b (leaf spring 15).
  • a plunger 16 which crosses the interruption distance 13 is also provided between the bimetallic piece 12 and the bridge member 14, which is, so to speak, caught between the bridge member 14 and the bimetallic piece 12 and, as it were, creates a movement coupling for these two parts.
  • the plunger 16 lying against the central area of the bimetallic piece 12 assumes such a position that the bridge member 14 under the action of the leaf spring 15 on the Contact points 10b, 11b is present and an electrical current can flow through the connection contact members 10, 11 to supply the consumer.
  • the bimetal piece 12, the bridge member 14, the spring 15 and the plunger 16 are mounted and / or guided in the interior of the housing on correspondingly arranged housing walls.
  • the connection contact members 10, 11 are also inserted into assigned housing recesses.
  • the details of how the bimetal piece 12 influences the electrical connection between the terminal contact members 10, 11 can in principle also be different. It is particularly important that the bimetallic piece 12 has such a shape (cold position) at ambient temperature that it causes the interruption distance 13 to be bridged, and that the bimetallic piece 12 deforms when a switching temperature is exceeded into a warm position which overcomes the bridging of the interruption distance 13. This warm position is indicated by dash-dotted lines at 17 in the drawing.
  • the bimetal piece 12 bulges in the opposite direction when the switching temperature is reached, i.e. towards the connection contact members 10, 11, so that the plunger 16 is moved somewhat through the interruption distance 13 and in the process lifts the bridge member 14 against the force of the spring 15 from the contact points 10b, 11b, so that the current passage through the connection contact members 10, 11 to the consumer is interrupted. In this way, the power supply to the consumer is interrupted when overheating occurs.
  • the two connection contact members 10, 11 are connected to one another via an electrical heating element 18 and an electrical lighting element 19.
  • the heating element and the lighting element are connected in parallel to the bridging distance 13.
  • This circuit is independent of the position of the bimetal piece 12, ie both the heating element 18 and the lighting element 19 are continuously conductively connected to the terminal contact members 10, 11.
  • two spring clips 20, 21 are used in the exemplary embodiment, each of which is supported at one end on one of the connection contact members 10, 11 and at the other end on the heating element 18, so that it is simultaneously held against a housing surface .
  • the electrical line sections 22, 23 leading to the lighting element 19 are connected to the spring clips 20, 21 in the exemplary embodiment.
  • the lighting element 19 can be, for example, a glow lamp, an incandescent lamp or, in principle, also a light-emitting diode.
  • An electrical resistor 24 is connected in series with the lighting element 19.
  • the heating element 18 and the lighting element 19 have no effect.
  • the bimetal piece 12 switches to its warm position 17 so that the direct connection of the connecting contact members 10, 11 is disconnected, the lighting element 19 lights up and the heating element 18 heats up, so that the bimetal piece 12, in the area of which the heating element 18 is located, the temperature is kept above the switching temperature by the heat given off by the heating element 18. Only when the consumer or the device on which the overload switch is located is disconnected from the mains the bimetal piece 12 cool down. At the same time, the lighting element 19 goes out.
  • the bimetal piece 12 does not automatically return to its cold position corresponding to the direct passage of current through the connecting contact members 10, 11, but remains in its warm position 17 regardless of the temperature.
  • the bimetal piece 12 is thus shaped such that it has no mechanical action remains in its warm position 17 from the outside once it has taken it.
  • the bimetal piece 12 can be deformed from its warm position 17 into the cold position by the action of a mechanical switching force when the switching temperature is undershot, the deformation taking place snap over a dead center position. If this switching force is exerted too early when the temperature is still above the switching temperature, the bimetallic element 12 currently follows the force effect, but after the force effect ceases, it immediately deforms back into the warm position.
  • the cap 26 is in the electrical Device installed condition visible and accessible from the outside, as can be seen from the drawing.
  • This cover cap 26 performs a double function, since it serves not only to cover the lighting element 29 but also to apply the switching force to the bimetal piece 12.
  • the cover cap 26 can be pressed in the manner of a push button towards the light-emitting element 19, it being provided with an actuating part 27 which extends into the area of the bimetallic piece 12 and which acts on the bimetallic piece 12 when the cover cap 26 is pressed in and on it, it is in the warm position 17 , exerts the switching force, so that the bimetal piece deforms into its cold position.
  • the cover cap 26 is guided in the sleeve-like holding part 4, which is hollow for this purpose.
  • the cover cap 26 has an essentially cylindrical casing body 28, which is guided so that it can be pressed into the holding part 4.
  • the cover cap 26 is closed by a base 29 which forms the actual cover.
  • a so-called free release can also be integrated into the push-button-like cover cap 26 with the actuating part 27, which causes the actuating part 27 to only briefly press against the bimetal piece 12 when the cover cap 26 is depressed and then snaps away again, even when the cover cap 26 is pressed in remains.
  • Such pressure switches are known per se, so that on the Representation of such a free release has been dispensed with.
  • the cap 26 is pressed in against the force of a spring 30 which is supported on the housing 1 on the other hand.
  • the heating element 18 is arranged between the bimetal piece 12 and the cover cap 26.
  • the bimetal piece 12 protrudes laterally over the heating element 18 in the direction from the cover cap 26 to the bimetal piece 12. Although this is not the case in the drawing plane, it is perpendicular to the drawing plane, i.e. below and above this.
  • the bimetallic piece 12 is not covered over the entire area by the heating element 18, so that the actuating part 27 seated on the cover cap 26 can protrude past the heating element 18 to the bimetallic piece 12 and its edge region is assigned.
  • the actuating part 27 visible in the drawing runs below the drawing plane past the heating element 18, so that it meets the edge region of the bimetal piece 12 there. The same conditions are present above the drawing level, i.e. a corresponding actuating part 27 also protrudes from the cover 26 towards the bimetal piece 12 above the drawing plane, so that the heating element 18 is overlapped on both sides.
  • the bimetal piece 12 bulges away in the direction away from the cover cap 26. Presses the actuating section 27 the edge region of the bimetal piece 12 in the Drawing down, the bimetal piece 12, which is supported in the middle by the plunger 16 and the force of the spring 15, snaps into its cold position.
  • the cover cap 26, the heating element 18, the bimetal piece 12 and the connection contact members 10, 11 are thus arranged in succession in this order.
  • the bimetallic piece 12 expediently has the shape of a circular disk which is slightly conical or bulged. This conical or curved shape can - in opposite directions - be present in both positions of the bimetal piece 12.
  • the heating element 18 is expediently plate-shaped and has an essentially rectangular shape.
  • the long rectangular dimension of the heating element 18 is visible in the sectional illustration of the drawing.
  • connection contact members 10, 11 and the interruption distance 13 present between them the connection to the bridge member 14 arranged on the opposite side of the connection contact members being established by means of the plunger 16.
  • the two further connection contact members 10 ', 11' are arranged in the same way as the described connection contact members 10, 11, with each other again having a spring-loaded bridge member 14 'corresponding to the bridge member 14. Because of the correspondence, the above description applies mutatis mutandis to this second pair of connection contact members with the associated details.
  • This second pair of connection contacts 10 ', 11' is seen from the cover cap 26 behind the first pair of contacts 10,11.
  • a second plunger 16 ' extends between the bridging members 14, 14' of the two pairs of contact members in an extension of the plunger 16, via which the two bridging members 14, 14 'are coupled to one another in terms of movement.
  • Dash-dotted lines still indicate a third pair of connection contact members with associated spring-loaded bridge member, which is arranged in the same way as the second pair behind the first pair behind the second pair of contact members 10 ', 11', with a third plunger between the extends second bridge member 14 'to the bridge member of the third pair of terminal contact members. If the bimetal piece 12 switches over, all bridge members are actuated simultaneously.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Electronic Switches (AREA)
  • Control Of Electric Motors In General (AREA)
EP97103619A 1996-03-15 1997-03-05 Dispositif de commutation de surcharge pour appareils électriques Expired - Lifetime EP0801408B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19610185A DE19610185C1 (de) 1996-03-15 1996-03-15 Thermischer Überlastschutz mit Rückstelleinrichtung für elektrische Geräte
DE19610185 1996-03-15

Publications (3)

Publication Number Publication Date
EP0801408A2 true EP0801408A2 (fr) 1997-10-15
EP0801408A3 EP0801408A3 (fr) 2000-07-26
EP0801408B1 EP0801408B1 (fr) 2004-12-29

Family

ID=7788371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97103619A Expired - Lifetime EP0801408B1 (fr) 1996-03-15 1997-03-05 Dispositif de commutation de surcharge pour appareils électriques

Country Status (3)

Country Link
EP (1) EP0801408B1 (fr)
AT (1) ATE286301T1 (fr)
DE (2) DE19610185C1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112534536A (zh) * 2018-07-31 2021-03-19 柏恩氏株式会社 电流切断装置、安全电路及二次电池组

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10066512B3 (de) * 2000-07-30 2018-02-22 Dewertokin Gmbh Schaltungsanordnung zur Netzfreischaltung von Sitz- und Schlafmöbeln
DE10037358B4 (de) * 2000-07-30 2015-01-15 Dewertokin Gmbh Schaltungsanordnung zur Netzfreischaltung von Sitz- und Schlafmöbeln
EP1933349B1 (fr) * 2006-12-13 2008-10-22 Lectra Trading AG Dispositif de commutation d'un courant de surcharge pour appareils électriques

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH244173A (de) * 1945-10-24 1946-08-31 Singer Mfg Co Thermostatischer Schalter mit Signalvorrichtung.
US2839638A (en) * 1957-03-28 1958-06-17 Metals & Controls Corp Thermally responsive switch structures
US3258567A (en) * 1964-05-29 1966-06-28 Elmwood Sensors Thermostat and reset therefor
DE2625120A1 (de) * 1976-06-04 1977-12-08 Hofsass P Elektrischer temperaturschutzschalter
DE3701240A1 (de) * 1986-01-31 1987-08-06 Kienzler Ag G Thermostat
DE3802647A1 (de) * 1988-01-29 1989-08-03 Lectra Trading Ag Anzeigevorrichtung fuer den schaltzustand eines ueberlastschalters

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2839637A (en) * 1957-04-08 1958-06-17 Metals & Controls Corp Thermally responsive device
DE3932604C1 (fr) * 1989-09-29 1990-05-03 Schoeller & Co Elektrotechnische Fabrik Gmbh & Co, 6000 Frankfurt, De

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH244173A (de) * 1945-10-24 1946-08-31 Singer Mfg Co Thermostatischer Schalter mit Signalvorrichtung.
US2839638A (en) * 1957-03-28 1958-06-17 Metals & Controls Corp Thermally responsive switch structures
US3258567A (en) * 1964-05-29 1966-06-28 Elmwood Sensors Thermostat and reset therefor
DE2625120A1 (de) * 1976-06-04 1977-12-08 Hofsass P Elektrischer temperaturschutzschalter
DE3701240A1 (de) * 1986-01-31 1987-08-06 Kienzler Ag G Thermostat
DE3802647A1 (de) * 1988-01-29 1989-08-03 Lectra Trading Ag Anzeigevorrichtung fuer den schaltzustand eines ueberlastschalters

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112534536A (zh) * 2018-07-31 2021-03-19 柏恩氏株式会社 电流切断装置、安全电路及二次电池组
CN112534536B (zh) * 2018-07-31 2024-03-22 柏恩氏株式会社 电流切断装置、安全电路及二次电池组

Also Published As

Publication number Publication date
ATE286301T1 (de) 2005-01-15
DE19610185C1 (de) 1997-04-10
DE59712140D1 (de) 2005-02-03
EP0801408B1 (fr) 2004-12-29
EP0801408A3 (fr) 2000-07-26

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