EP0153425B1 - Resistance element with zig-zag current paths - Google Patents

Resistance element with zig-zag current paths Download PDF

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Publication number
EP0153425B1
EP0153425B1 EP84101939A EP84101939A EP0153425B1 EP 0153425 B1 EP0153425 B1 EP 0153425B1 EP 84101939 A EP84101939 A EP 84101939A EP 84101939 A EP84101939 A EP 84101939A EP 0153425 B1 EP0153425 B1 EP 0153425B1
Authority
EP
European Patent Office
Prior art keywords
resistance element
strips
projections
current paths
insulating
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
Application number
EP84101939A
Other languages
German (de)
French (fr)
Other versions
EP0153425A1 (en
Inventor
Heinz Dipl.-Ing. Lämmermann (FH)
Konrad Dipl.-Ing. Stark (Fh)
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.)
Siemens AG
Original Assignee
Siemens 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 Siemens AG filed Critical Siemens AG
Priority to AT84101939T priority Critical patent/ATE29086T1/en
Priority to DE8484101939T priority patent/DE3465539D1/en
Priority to EP84101939A priority patent/EP0153425B1/en
Priority to DE19848406442U priority patent/DE8406442U1/en
Publication of EP0153425A1 publication Critical patent/EP0153425A1/en
Application granted granted Critical
Publication of EP0153425B1 publication Critical patent/EP0153425B1/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C3/00—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids
    • H01C3/10—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element having zig-zag or sinusoidal configuration
    • H01C3/12—Non-adjustable metal resistors made of wire or ribbon, e.g. coiled, woven or formed as grids the resistive element having zig-zag or sinusoidal configuration lying in one plane

Definitions

  • the invention relates to a resistance element with meandering current paths according to the preamble of claim 1.
  • Such inherently stabilized resistance elements are known from DE-PS 949 578, in which separate insulating bodies are pressed in as the position-fixing means within the respective insulating strip between the latter and the adjacent deflection points of the current paths.
  • These bodies can be individual heat-resistant fixed elongated spacers, e.g. B. be made of ceramic, which protrude beyond the ends of the deflection points within the insulating strip and have overlap projections on their longitudinal sides.
  • These relatively complex spacers must be inserted between adjacent deflection points from their ends before the insulating strip and then the retaining strip are applied, which means a considerable amount of assembly work and involves the risk that the insulating strips and / or the spacers are damaged when the retaining strips are applied will.
  • a simpler and safer assembly of such trimmed resistance elements can be achieved by applying small amounts of a self-curing, heat-resistant insulating material to individual inner locations of the insulating strips, the amounts being distributed when the insulating strips are pushed onto the deflection points between them and around their ends and in the hardened state within the Insulating strips result in an insulating spacer layer. It has been found, however, that this expensive and complex measure cannot be used in operation, since the hardened layer crumbles out due to thermal expansion and vibrations and the adjacent current paths, in particular in the transition region to the deflection points when shaken by touching resistance devices equipped with such resistance elements, touch and corresponding Cause short circuits that lead to the destruction of the entire resistance element.
  • the invention has for its object to achieve a permanent position fixation of the trimmed deflection points in resistance elements of the type mentioned with relatively low positional stability of the individual current paths, as they are inevitable with stamped sheet metal elements or thin-walled cast elements.
  • the resistance element 1 shown in FIG. 1 is equipped with insulating strips 7 and holding strips 8 on both edges, but for the sake of simplicity only such edge trimming is shown.
  • the only partially shown keeled current paths 3 lie between the element ends 2 provided with edge recesses 2A for element mounting, so that the dash-dot lines of current from one element end 2 through the current paths 3 to the other element end 2 result from the connection point 2B.
  • the individual adjacent current paths 3 are conductively connected to one another by flat deflection points 4 lying in one plane.
  • the one-piece resistance elements 1 can be punched out of sheet metal and provided with or without gills serving for air swirling.
  • the flat deflection points 4 lie with their ends in a line with the edges of the element ends 2 and are covered on each edge side by a flexible, curable insulating strip 7 with a U-shaped cross section, which in turn is covered by a clamping U-shaped retaining strip 8 Sheet is covered, with each insulating strip protruding above its holding strip to avoid short circuits.
  • the ends of holding and insulating strips can be set back against the element ends 2 (as shown) or can also protrude over them with the same front edges.
  • At least one integrally formed lateral rigid projection is provided on the respective edge regions and the deflection points on at least one side surface.
  • two or three projections 5 (front) and 6 (rear) are arranged on the element ends on both side surfaces and only one projection (5, 6) is alternately arranged on the front and the rear at the deflection points 4.
  • the embossed or cast-on projections can also be arranged lying on both sides in an axis.
  • the positive, non-destructive anchoring of the projections 5, 6 with the inside of the insulating strips 7 is achieved in that when the clamping retaining strips 8 are pressed around, corresponding depressions 9, 10 according to FIG. 4 form on the inside in the area of the associated rigid and not sharp-edged projections those displaced by the projections 5, 6 Pick up parts of the form-elastic insulating strips 7 and ensure that they do not damage them and ensure an isolating, perfect, positive connection between the resistance element 1, insulating strips 7 and clamping retaining strips 8.
  • the insulating strips 7 are fitted with the holding strips 8 still open and inserted into a pressing tool which, with its metallic stamp, presses the holding strips at the edge and end regions against the element ends and the deflection points, and in doing so the projections and depressions over the Insulating strips are positively engaged without the insulating strips being damaged.
  • the insulating strips 7 harden in a stable position.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Thermistors And Varistors (AREA)
  • Details Of Resistors (AREA)
  • Apparatuses And Processes For Manufacturing Resistors (AREA)
  • Insulating Bodies (AREA)

Abstract

1. A resistance element with serpentine current paths having flat reversal portions located in one plane at each side, embedded in insulating strips having a U-shaped cross-section each surrounded by a retaining strip having a U-shaped cross-section, the reversal portions being protected from contacting opposed current paths by location-fixing means inside the insulating strips, characterised in that the reversal portions (4) and the ends (2) of the resistance element (1) exhibit at least one rigid lateral projection (5, 6) in the area of each insulating strip (7), and the projections (5, 6) are held in form-locking engagement with the insulating strips (7) by the clamping retaining strips (8).

Description

Die Erfindung betrifft ein Widerstandselement mit mäanderförmig angeordneten Strompfaden nach dem Oberbegriff des Anspruchs 1.The invention relates to a resistance element with meandering current paths according to the preamble of claim 1.

Solche in sich stabilgemachte Widerstandselemente sind aus der DE-PS 949 578 bekannt, bei dem als lagefixierende Mittel innerhalb der jeweiligen Isolierleiste zwischen dieser und den einander benachbarten Umlenkstellen der Strompfade gesonderte isolierende Körper eingepreßt sind. Diese Körper können einzelne hitzebeständige feste längliche Distanzstücke, z. B. aus Keramik sein, die über die Enden der Umlenkstellen innerhalb der Isolierleiste vorragen und auf ihren Längsseiten die Umlenkstellen übergreifende Vorsprünge aufweisen. Diese relativ aufwendigen Distanzstücke müssen zwischen benachbarten Umlenkstellen von deren Enden her eingeschoben werden, bevor die Isolierleiste und danach die Halteleiste aufgebracht werden, was einen erheblichen Montageaufwand bedeutet und die Gefahr mit sich bringt, daß die Isolierleisten und/oder die Distanzstücke beim Aufbringen der Halteleisten beschädigt werden.Such inherently stabilized resistance elements are known from DE-PS 949 578, in which separate insulating bodies are pressed in as the position-fixing means within the respective insulating strip between the latter and the adjacent deflection points of the current paths. These bodies can be individual heat-resistant fixed elongated spacers, e.g. B. be made of ceramic, which protrude beyond the ends of the deflection points within the insulating strip and have overlap projections on their longitudinal sides. These relatively complex spacers must be inserted between adjacent deflection points from their ends before the insulating strip and then the retaining strip are applied, which means a considerable amount of assembly work and involves the risk that the insulating strips and / or the spacers are damaged when the retaining strips are applied will.

Eine einfachere und gefahrlosere Montage solcher besäumter Widerstandselemente läßt sich durch an einzelnen Innenstellen der Isolierleisten aufgebrachte geringe Mengen eines selbsthärtenden hitzebeständigen Isolierstoffes erreichen, wobei sich die Mengen beim Aufschieben der Isolierleisten auf die Umlenkstellen zwischen diese und um deren Enden herum verteilen und im ausgehärteten Zustand innerhalb der Isolierleisten eine isolierende distanzhaltende Schicht ergeben. Es hat sich aber ergeben, daß diese teuere und aufwendige Maßnahme im Betrieb nicht brauchbar ist, da durch Wärmeausdehnung und Erschütterungen die ausgehärtete Schicht ausbröckelt und die benachbarten Strompfade, insbesondere im Übergangsbereich zu den Umlenkstellen bei Rüttelbeanspruchung von mit solchen Widerstandselementen bestückten Widerstandsgeräten sich berühren und entsprechende Kurzschlüsse bewirken, die zur Zerstörung des ganzen Widerstandselementes führen.A simpler and safer assembly of such trimmed resistance elements can be achieved by applying small amounts of a self-curing, heat-resistant insulating material to individual inner locations of the insulating strips, the amounts being distributed when the insulating strips are pushed onto the deflection points between them and around their ends and in the hardened state within the Insulating strips result in an insulating spacer layer. It has been found, however, that this expensive and complex measure cannot be used in operation, since the hardened layer crumbles out due to thermal expansion and vibrations and the adjacent current paths, in particular in the transition region to the deflection points when shaken by touching resistance devices equipped with such resistance elements, touch and corresponding Cause short circuits that lead to the destruction of the entire resistance element.

Der Erfindung liegt die Aufgabe zugrunde, bei Widerstandselementen der eingangs genannten Art mit relativ geringer Lagestabilität der einzelnen Strompfade, wie sie bei gestanzten Blechelementen oder dünnwandigen Gußelementen unvermeidlich sind, auf einfache und sichere Weise eine dauerhafte Lagefixierung der besäumten Umlenkstellen zu erreichen.The invention has for its object to achieve a permanent position fixation of the trimmed deflection points in resistance elements of the type mentioned with relatively low positional stability of the individual current paths, as they are inevitable with stamped sheet metal elements or thin-walled cast elements.

Die Lösung der gestellten Aufgabe gelingt durch die Maßnahmen nach dem Kennzeichen des Anspruchs 1.The task is solved by the measures according to the characterizing part of claim 1.

Vorteilhafte Ausgestaltungen der Erfindung sind Gegenstand weiterer Ansprüche.Advantageous embodiments of the invention are the subject of further claims.

In der Zeichnung ist ein Ausführungsbeispiel für ein besäumtes Widerstandselement dargestellt und nachfolgend näher erläutert. Es zeigen

  • Figur 1 ein randbesäumtes gestanztes Blechwiderstandselement in Seitenansicht,
  • Figur 2 den Gegenstand der Fig. 1 an der Linie 11-11 im Querschnitt,
  • Figur 3 die in Fig. 1 im Kreis liegende Stelle 111 in vergrößerter Darstellung,
  • Figur 4 den besäumten Rand in Fig. 2 in vergrößerter Darstellung.
In the drawing, an embodiment of a trimmed resistance element is shown and explained in more detail below. Show it
  • FIG. 1 shows a side-edged, stamped sheet metal resistance element,
  • 2 shows the subject of FIG. 1 on the line 11-11 in cross section,
  • 3 shows the point 111 lying in a circle in FIG. 1 in an enlarged representation,
  • Figure 4 shows the trimmed edge in Fig. 2 in an enlarged view.

Das in Fig. 1 gezeigte Widerstandselement 1 ist an sich an beiden Rändern mit Isolierleisten 7 und Halteleisten 8 bestückt, jedoch ist der Einfachheit halber nur eine solche Randbesäumung dargestellt. Die nur teilweise dargestellten gekiemten Strompfade 3 liegen zwischen den mit Randausnehmungen 2A zur Elementhalterung versehenen Elementenenden 2, so daß sich von der Anschlußstelle 2B die strichpunktiert angedeuteten Stromverläufe von einem Elementenende 2 durch die Strompfade 3 zum anderen Elementenende 2 ergeben. Die einzelnen benachbarten Strompfade 3 sind durch in einer Ebene liegende flache Umlenkstellen 4 miteinander leitend verbunden. Die einstückigen Widerstandselemente 1 können aus Blech gestanzt und mit oder ohne zur Luftverwirbelung dienenden Kiemen versehen sein. Die flachen Umlenkstellen 4 liegen mit ihren Enden in einer Linie mit den Rändern der Elementenenden 2 und werden je Randseite mit diesen von einer im Anfangsstadium nachgiebigen, aushärtbaren Isolierleiste 7 mit U-förmigem Querschnitt überdeckt, die ihrerseits von einer klammernden U-förmigen Halteleiste 8 aus Blech überdeckt ist, wobei zur Vermeidung von Kurzschlüssen jede Isolierleiste über ihre Halteleiste vorragt. Die Enden von Halte- und Isolierleisten können gegen die Elementenenden 2 zurückgesetzt sein (wie dargestellt) oder auch über diese stirnkantengleich vorragen.The resistance element 1 shown in FIG. 1 is equipped with insulating strips 7 and holding strips 8 on both edges, but for the sake of simplicity only such edge trimming is shown. The only partially shown keeled current paths 3 lie between the element ends 2 provided with edge recesses 2A for element mounting, so that the dash-dot lines of current from one element end 2 through the current paths 3 to the other element end 2 result from the connection point 2B. The individual adjacent current paths 3 are conductively connected to one another by flat deflection points 4 lying in one plane. The one-piece resistance elements 1 can be punched out of sheet metal and provided with or without gills serving for air swirling. The flat deflection points 4 lie with their ends in a line with the edges of the element ends 2 and are covered on each edge side by a flexible, curable insulating strip 7 with a U-shaped cross section, which in turn is covered by a clamping U-shaped retaining strip 8 Sheet is covered, with each insulating strip protruding above its holding strip to avoid short circuits. The ends of holding and insulating strips can be set back against the element ends 2 (as shown) or can also protrude over them with the same front edges.

Zur lagefixierenden Verklammerung der Umlenkstellen 4 und der Ränder der Elementenenden 2 mit den Randbesäumungen, d. h. mit den Isolierleisten 7 und den klammernden Halteleisten 8, sind an den jeweiligen Randbereichen und den Umlenkstellen an wenigstens einer Seitenfläche jeweils mindestens ein angeformter seitlicher steifer Vorsprung vorgesehen.To fix the deflection of the deflection points 4 and the edges of the element ends 2 with the edge trimmings, d. H. with the insulating strips 7 and the clamping retaining strips 8, at least one integrally formed lateral rigid projection is provided on the respective edge regions and the deflection points on at least one side surface.

Im Ausführungsbeispiel sind an den Elementenenden auf beiden Seitenflächen zwei bzw. drei Vorsprünge 5 (Vorderseite) und 6 (Rückseite) und an den Umlenkstellen 4 jeweils nur ein Vorsprung (5, 6) abwechselnd auf der Vorder- und der Rückseite angeordnet.In the exemplary embodiment, two or three projections 5 (front) and 6 (rear) are arranged on the element ends on both side surfaces and only one projection (5, 6) is alternately arranged on the front and the rear at the deflection points 4.

Die geprägten bzw. angegossenen Vorsprünge können auch beidseitig in einer Achse liegend angeordnet sein.The embossed or cast-on projections can also be arranged lying on both sides in an axis.

Die formschlüssige zerstörungssichere Verankerung der Vorsprünge 5, 6 mit der Innenseite der Isolierleisten 7 wird dadurch erreicht, daß sich beim Umpressen der klammernden Halteleisten 8 innenseitig im Bereich der zugeordneten steifen und nicht scharfkantigen Vorsprünge jeweils passende Vertiefungen 9, 10 gemäß Fig. 4 bilden, die die von den Vorsprüngen 5, 6 verdrängten Teile der formelastischen Isolierleisten 7 aufnehmen und ohne eine Beschädigung derselben eine isoliermäßige einwandfreie formschlüssige Verbindung zwischen Widerstandselement 1, Isolierleisten 7 und klammernden Halteleisten 8 sicherstellen.The positive, non-destructive anchoring of the projections 5, 6 with the inside of the insulating strips 7 is achieved in that when the clamping retaining strips 8 are pressed around, corresponding depressions 9, 10 according to FIG. 4 form on the inside in the area of the associated rigid and not sharp-edged projections those displaced by the projections 5, 6 Pick up parts of the form-elastic insulating strips 7 and ensure that they do not damage them and ensure an isolating, perfect, positive connection between the resistance element 1, insulating strips 7 and clamping retaining strips 8.

Die Isolierleisten 7 werden nach Aufbringung auf die Elementenränder mit den noch geöffneten Halteleisten 8 bestückt und in ein Umpreßwerkzeug eingefügt, das mit seinem metallischen Stempel die Halteleisten an den Rand- und Endbereichen an die Elementenenden und die Umlenkstellen anpreßt und dabei die Vorsprünge und Vertiefungen über die Isolierleisten formschlüssig in Eingriff gebracht werden, ohne daß die Isolierleisten beschädigt werden können. Bei der betriebsmäßigen Erwärmung der Elemente 1 härten die Isolierleisten 7 lagestabil aus.After application to the element edges, the insulating strips 7 are fitted with the holding strips 8 still open and inserted into a pressing tool which, with its metallic stamp, presses the holding strips at the edge and end regions against the element ends and the deflection points, and in doing so the projections and depressions over the Insulating strips are positively engaged without the insulating strips being damaged. When the elements 1 are heated during operation, the insulating strips 7 harden in a stable position.

Es ergeben sich damit auf einfache Weise rüttelfeste und dauerhaft einwandfreie Lagefixierungen der Strompfade gegeneinander.This results in simple, vibration-proof and permanently correct position fixations of the current paths relative to one another.

Claims (3)

1. A resistance element with serpentine current paths having flat reversal portions located in one plane at each side, embedded in insulating strips having a U-shaped cross-section each surrounded by a retaining strip having a U-shaped cross-section, the reversal portions being protected from contacting opposed current paths by location-fixing means inside the insulating strips, characterised in that the reversal portions (4) and the ends (2) of the resistance element (1) exhibit at least one rigid lateral projection (5. 6) in the area of each insulating strip (7), and the projections (5, 6) are held in form-locking engagement with the insulating strips (7) by the clamping retaining strips (8).
2. A resistance element as claimed in Claim 1, characterised in that the rigid projections (5, 6) at the ends (2) of the resistance element and at the reversal portions (4) are disposed with at least one in each alternating side position, and when pressed over each of the resilient clamping retaining strips (8) in the area of the projections (5, 6) form a corresponding internal recess (9. 10) for form-locking connection to the retaining strips (8) of the resistance element (1) via its insulating strips.
3. A resistance element as claimed in Claims 1 and 2, characterised in that for a sheet resistance element (1) the projections (5. 6) are formed by pimples stamped without burrs when the current paths (3) are stamped, whilst in the case of a cast resistance element (1) the projections (5, 6) are formed by cast cylindrical pimples without any sharp edges.
EP84101939A 1984-02-23 1984-02-23 Resistance element with zig-zag current paths Expired EP0153425B1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
AT84101939T ATE29086T1 (en) 1984-02-23 1984-02-23 RESISTANCE ELEMENT WITH CURRENT PATHS ARRANGED IN A MEANDER-FORM.
DE8484101939T DE3465539D1 (en) 1984-02-23 1984-02-23 Resistance element with zig-zag current paths
EP84101939A EP0153425B1 (en) 1984-02-23 1984-02-23 Resistance element with zig-zag current paths
DE19848406442U DE8406442U1 (en) 1984-02-23 1984-03-01 RESISTANCE ELEMENT WITH Meandering Arranging Threads

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP84101939A EP0153425B1 (en) 1984-02-23 1984-02-23 Resistance element with zig-zag current paths

Publications (2)

Publication Number Publication Date
EP0153425A1 EP0153425A1 (en) 1985-09-04
EP0153425B1 true EP0153425B1 (en) 1987-08-19

Family

ID=8191797

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84101939A Expired EP0153425B1 (en) 1984-02-23 1984-02-23 Resistance element with zig-zag current paths

Country Status (3)

Country Link
EP (1) EP0153425B1 (en)
AT (1) ATE29086T1 (en)
DE (2) DE3465539D1 (en)

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB218400A (en) * 1923-04-11 1924-07-10 Noel George Langrish Improvements relating to electrical resistances
FR903775A (en) * 1943-12-02 1945-10-15 Cie Generale De Travaux D Ecla Improvements to electrical resistance elements
DE939461C (en) * 1952-08-29 1956-02-23 Siemens Ag Insulation support for resistance elements
DE949578C (en) * 1953-07-01 1956-09-20 Siemens Ag Insulation support for resistance elements

Also Published As

Publication number Publication date
DE8406442U1 (en) 1984-07-12
EP0153425A1 (en) 1985-09-04
DE3465539D1 (en) 1987-09-24
ATE29086T1 (en) 1987-09-15

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