WO1997027647A1 - Element de contact pour conducteur electrique - Google Patents

Element de contact pour conducteur electrique Download PDF

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Publication number
WO1997027647A1
WO1997027647A1 PCT/EP1996/004760 EP9604760W WO9727647A1 WO 1997027647 A1 WO1997027647 A1 WO 1997027647A1 EP 9604760 W EP9604760 W EP 9604760W WO 9727647 A1 WO9727647 A1 WO 9727647A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact element
element according
electrical conductor
clamping body
conductor
Prior art date
Application number
PCT/EP1996/004760
Other languages
German (de)
English (en)
Inventor
Michael Vankov
Gunther Seidel
Rudolf Majthan
Original Assignee
Braun Aktiengesellschaft
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 Braun Aktiengesellschaft filed Critical Braun Aktiengesellschaft
Priority to AU74969/96A priority Critical patent/AU7496996A/en
Priority to EP96937330A priority patent/EP0876690B1/fr
Priority to DE59605661T priority patent/DE59605661D1/de
Priority to AT96937330T priority patent/ATE195038T1/de
Publication of WO1997027647A1 publication Critical patent/WO1997027647A1/fr

Links

Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/22—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible
    • H05B3/32—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor mounted on insulators on a metallic frame
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/02—Details
    • H05B3/06—Heater elements structurally combined with coupling elements or holders

Definitions

  • the invention relates to a contact element for an electrical conductor, in particular a heating wire in a device for personal use, such as a hairdryer, a curling brush, a kitchen device or the like.
  • the contact element essentially consists of a base body with at least one contact surface for connecting the electrical conductor and a clamping body for fastening the electrical conductor.
  • Various types of embodiments of the contact elements are known from the prior art for connecting resistance heating wires to the voltage taps in hair dryer heaters.
  • clamp connections crimp connections, resistance welding connections or combinations of crimp and resistance welding connections are used.
  • the contact resistance changes when the heat is changed, particularly when the devices are used in damp rooms.
  • the wire cross-section and therefore the contact resistance at the connection point change as a result of the welding pressure.
  • the local heating or overheating at the welding point leads to material damage or embrittlement, which increases the risk of breakage of the heating wire.
  • the object of the present invention is to provide a possibility for long-term stable contacting for an electrical conductor, in particular a resistance heating wire in hair dryer heaters, wherein the contact element should also be suitable for the fully automatic production of the resistance heating.
  • the invention solves this problem with a contact element of the type described above in that the clamping body of the contact element with the electrical conductor, ie the resistance heating wire has a material connection produced by the introduction of heat, in particular a fused connection.
  • a connection advantageously has the high stability and reliability of a welded connection, while at the same time avoiding the disadvantageous reduction in cross-section, as is customary in resistance welds.
  • the transition resistance does not change, not even due to aging.
  • Such a redesigned contact element can advantageously be designed as a voltage tap both as an end or center tap, or as a single or double tap for a plurality of heating wires, and can be attached to a micanite plate. This new design of the contact element is advantageously particularly suitable for the production of bifilar wound heaters.
  • the material connection between the clamping body and the electrical conductor is selected so that it passes through the conductor at least in some areas, so that preferably at least one third of the conductor cross section is melted. This advantageously creates a permanent connection between the contact element and the conductor, i.e. created the heating wire, which ensures good contacting without material weakening of the conductor.
  • the contact surface is formed by a U-shaped recess with a rounded or angular base area, so that the contact element can be easily manufactured, even in large numbers, for example as a stamped part from a sheet-metal base body.
  • the bottom area of the recess can be adapted to the respective cross section of the heating wire by different designs of the punching tool.
  • the greatest width of the recess of the contact element is chosen so that it corresponds approximately to the diameter of the electrical conductor or the greatest width of the conductor cross section. This advantageously enables exact fixing of the wire in the recess, regardless of the cross-sectional shape of the wire, which can be circular or rectangular, for example.
  • the clamping body is connected in one piece to the base body, it can be designed as a leg of the U-shaped recess in the base body, which advantageously enables simple and inexpensive production of the contact element, O 97/27647 PC17EP96 / 04760
  • - 3 - is made possible, for example, as a stamped part made of a flat sheet metal.
  • the clamping body is designed as a bending lug with a thickening at its free end, so that the heating wire to be fastened can advantageously be mechanically clamped by the bending lug first before it is melted by heat confinement.
  • the bending tab has at least one nose or a nose-like edge for attaching a bending means, so that the bending process can advantageously also be carried out fully automatically.
  • the formation of the bending lug with a thickening ensures that there is a sufficient accumulation of material, which material connection through the fusion with the conductor, i.e. the heating wire.
  • stop means on the contact element enables automatic alignment of the connecting element in a heating device, so that the contact element can advantageously be brought into reproducible positions.
  • the sling means By designing the sling means as a recess, bore, centering point or the like, simple manufacture of the sling means is possible, for example using stamping technology.
  • a threading aid is provided, in particular for the automatic and correct feeding of the heating wire to the contact surface. This ensures a safe and reproducible manufacture of the contact element.
  • fastening means for example a tab, a pin or the like, are provided for fastening the contact element to a Arrange carrier.
  • the carrier can advantageously be the heating carrier in a hairdryer. With such a peg-shaped or tab-shaped design of the fastening means, this can also be produced simply and inexpensively by a punching process.
  • a method for fastening an electrical conductor, in particular a heating wire in a hair dryer, to a contact element which method can also be an independent invention
  • the electrical conductor can be materially connected, in particular fused, to the contact element by the introduction of heat.
  • the connection is produced very gently, i.e. the conductor or heating wire is not partially overheated and embrittled, as in the resistance welding process.
  • Such a method can also be carried out simultaneously on several contact elements in production.
  • the heat is introduced by means of a spot welding process, in particular a laser, a plasma or a similar process.
  • a spot welding process in particular a laser, a plasma or a similar process.
  • a clamping body provided on the contact element can be shaped by means of a bending process around the electrical conductor resting on a contact surface of the contact element.
  • a bending means is attached to the nose-like edge of the clamping body, which advantageously enables fully automatic bending of the clamping body around the heating wire.
  • a laser beam is directed onto the thickening of the clamping body.
  • the clamping body is melted in a simple manner, which wraps itself around the wire as a melt and permanently connects with the contact element.
  • the energy of the laser beam is dimensioned such that it heats the heating wire in at least some areas, so that the wire can preferably be melted to one third of the wire cross section.
  • This advantageously creates a connection between the contact element and the heating wire, which is very gentle on the material, i.e. there is no reduction in cross-section, the contact resistance is not changed and the melting point is not embrittled.
  • FIG. 1 shows a contact element for a heating wire in a top view and in a greatly enlarged representation
  • FIG. 2 shows a contact element according to FIG. 1, but with an inserted heating wire
  • Fig. 3 shows a contact element according to Fig. 2 with a fixed heating wire
  • Fig. 4 shows a contact element for two heating wires in plan view.
  • a contact element 2 (FIG. 1) essentially consists of a base body 4, which is produced from a flat and electrically conductive sheet metal, for example stamped out. Such a contact element 2 is connected at its lower end, which is not shown for the sake of simplicity, to a voltage supply, an electrical consumer or another electrical component. At its upper end, the contact element 2 has a U-shaped recess 10, which is provided with a contact surface 6 at its base. The maximum width 1 2 of the recess 10 is dimensioned such that an electrical conductor to be connected, for example O 97/27647 PC17EP96 / 04760
  • the recess 10 is limited on one side by a bendable clamping body 8 having a neck 14 and a head-like thickening 16 at its outer end. On the thickening 16, a nose 18 is arranged on the outside, which should make it easier to grip an automatic bending device (not shown).
  • the second leg of the recess 10 is formed by a centering tip 20 which on the one hand projects beyond the clamping body 8 and on the other hand is provided with a threading-in bevel 22.
  • This threading-in bevel 22 is intended to allow a safe and simple insertion of a heating wire into the recess 10 in a fully automated manufacturing process of the contact element or the hair dryer heating.
  • a laterally protruding pin 24 is provided for fastening the contact element 2 in a support, for example a heating support. This can also be easily bent out of the main plane of the base body 4 by laterally adjacent notches and thus point in a direction 90 ° to the surface of the base body 4.
  • the contact surface 6 ⁇ Fig. 2) of the contact element 2 has an at least partially semicircular configuration, in which a heating wire 26 with a circular cross section is inserted.
  • the clamping body 8 is bent around the heating wire 26 so that the head-like thickening 16 of the clamping body 8 comes to rest on the opposite wall of the recess below the threading bevel 22. This bending process can be carried out either simply by hand or in a fully automatic process.
  • this region is melted in such a way that it forms a material connection with the heating wire 26.
  • the heating wire 26 is melted at least in some areas, preferably approximately one third of its wire cross section. As a result, the heating wire 26 is completely surrounded by the contact element 2.
  • Such a connection has a high stability and reliability while at the same time avoiding a reduction in cross-section or a change in the contact resistance.
  • a contact element 2 described can be designed, for example, in the case of a hair dryer heater as a voltage tap, optionally as an end tap or as a center tap; it can also be designed for connecting and fastening a single heating wire, or else as a double tap for connecting several, for example two, heating wires (FIG. 4).
  • a contact element 30 essentially consists of a base body 32, the lower end of which is not shown for the sake of simplicity.
  • a fastening pin 34 is provided in this base body 32, for example punched out.
  • two clamping bodies 36, 38 are provided, which are separated from one another by a symmetrical, centrally arranged centering tip 40.
  • the centering tip 40 is provided on both sides with two threading bevels 42, 44 which lead into U-shaped recesses for receiving the heating wires 46, 48.
  • the clamping bodies 36, 38 correspond in their design to the clamping body 8 in FIG. 1.
  • the clamping body 36 is shown in its original position; the clamping body 38, on the other hand, is already bent around the heating wire 48 and prepared for fusing with the heating wire 48.

Landscapes

  • Connections Effected By Soldering, Adhesion, Or Permanent Deformation (AREA)
  • Manufacturing Of Electrical Connectors (AREA)
  • Resistance Heating (AREA)
  • Details Of Resistors (AREA)
  • Lead Frames For Integrated Circuits (AREA)
  • Conductive Materials (AREA)
  • Contacts (AREA)

Abstract

L'invention concerne un élément de contact pour au moins un conducteur électrique, notamment un fil chauffant (26) dans un appareil à usage personnel, tel qu'un sèche-cheveux, une brosse à friser, un appareil de cuisine ou similaire, qui comprend un corps de base (4) comportant au moins une surface de contact pour connecter le conducteur électrique (26) et un corps de serrage (8) pour le fixer. L'invention concerne en outre un procédé permettant de fixer le fil chauffant (26) sur l'élément de contact (2). A cet effet, le corps de serrage (8) présente une connexion matérielle avec le conducteur électrique, produite par apport de chaleur, notamment une connexion par fusion.
PCT/EP1996/004760 1996-01-25 1996-11-02 Element de contact pour conducteur electrique WO1997027647A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AU74969/96A AU7496996A (en) 1996-01-25 1996-11-02 Contact for an electrical conductor
EP96937330A EP0876690B1 (fr) 1996-01-25 1996-11-02 Element de contact pour conducteur electrique
DE59605661T DE59605661D1 (de) 1996-01-25 1996-11-02 Kontaktelement für einen elektrischen leiter
AT96937330T ATE195038T1 (de) 1996-01-25 1996-11-02 Kontaktelement für einen elektrischen leiter

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19602591A DE19602591A1 (de) 1996-01-25 1996-01-25 Kontaktelement für einen elektrischen Leiter
DE19602591.5 1996-01-25

Publications (1)

Publication Number Publication Date
WO1997027647A1 true WO1997027647A1 (fr) 1997-07-31

Family

ID=7783628

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1996/004760 WO1997027647A1 (fr) 1996-01-25 1996-11-02 Element de contact pour conducteur electrique

Country Status (5)

Country Link
EP (1) EP0876690B1 (fr)
AT (1) ATE195038T1 (fr)
AU (1) AU7496996A (fr)
DE (2) DE19602591A1 (fr)
WO (1) WO1997027647A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016100561A1 (de) * 2016-01-14 2017-07-20 Pac Tech - Packaging Technologies Gmbh Verfahren zur Platzierung und Kontaktierung eines Prüfkontakts

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE378542C (de) * 1923-07-18 Bbc Brown Boveri & Cie Elektrische Verbindung fuer hohe Temperaturen
US2794176A (en) * 1953-05-21 1957-05-28 Utica Drop Forge & Tool Corp Terminal construction
GB2081029A (en) * 1980-07-28 1982-02-10 Siemens Ag Method of Contacting Electrical Components
DE4122429A1 (de) * 1991-07-06 1993-01-07 Swf Auto Electric Gmbh Elektrisches geraet, insbesondere fuer kraftfahrzeuge

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2953859C2 (de) * 1979-01-15 1984-01-12 Fritz Eichenauer GmbH & Co KG, 6744 Kandel Abgriffselement für elektrische Heizgeräte

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE378542C (de) * 1923-07-18 Bbc Brown Boveri & Cie Elektrische Verbindung fuer hohe Temperaturen
US2794176A (en) * 1953-05-21 1957-05-28 Utica Drop Forge & Tool Corp Terminal construction
GB2081029A (en) * 1980-07-28 1982-02-10 Siemens Ag Method of Contacting Electrical Components
DE4122429A1 (de) * 1991-07-06 1993-01-07 Swf Auto Electric Gmbh Elektrisches geraet, insbesondere fuer kraftfahrzeuge

Also Published As

Publication number Publication date
ATE195038T1 (de) 2000-08-15
DE59605661D1 (de) 2000-08-31
DE19602591A1 (de) 1997-07-31
EP0876690B1 (fr) 2000-07-26
AU7496996A (en) 1997-08-20
EP0876690A1 (fr) 1998-11-11

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