EP0135704B1 - Electric resistance heating element - Google Patents

Electric resistance heating element Download PDF

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Publication number
EP0135704B1
EP0135704B1 EP84108800A EP84108800A EP0135704B1 EP 0135704 B1 EP0135704 B1 EP 0135704B1 EP 84108800 A EP84108800 A EP 84108800A EP 84108800 A EP84108800 A EP 84108800A EP 0135704 B1 EP0135704 B1 EP 0135704B1
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EP
European Patent Office
Prior art keywords
heating element
resistance heating
element according
strip
bend
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
EP84108800A
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German (de)
French (fr)
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EP0135704A1 (en
Inventor
Manfred Brandstäter
Alfred Dipl.-Ing. Könnemann
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.)
Grote and Hartmann GmbH and Co KG
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Grote and Hartmann GmbH and Co KG
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Publication of EP0135704A1 publication Critical patent/EP0135704A1/en
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    • 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
    • H05B3/24—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater non-flexible heating conductor being self-supporting

Definitions

  • the invention relates to a resistance heating element with a heating conductor consisting of a one-piece sheet metal stamping strip and running in a meandering manner in a longitudinal plane, the sheet metal stamping strip being slidably held in the holder in the region of meandering arches.
  • Such a resistance heating element is suitable for. B. for an intake air line between the carburetor and the engine block of an internal combustion engine, wherein the resistance heating element is flushed with a fluid to heat it.
  • Such a resistance heating element is known from DE-C-650 676.
  • the meandering heating conductor is made from a rectangular sheet metal strip, in which the latter is cut alternately from the two long sides. The resulting parallel strips are then bent out of the sheet plane in opposite directions, but the arc regions connecting the strips remain in the original sheet plane and are slidably supported in the grooves of a holder.
  • a resistance heating element which has a meandering heating conductor element consisting of a one-piece stamped sheet metal part.
  • This heating conductor is essentially made up of a corrugation - as a flat, rectangular element.
  • DE-A 1-2 703 293 describes a heating register with a housing in which a flat strip made of metallic resistance material is accommodated.
  • the flat strip has incisions which are made alternately from the opposite longitudinal edges in the opposite direction.
  • the metal strip is then pulled apart like an accordion.
  • the strip is bent in a ring.
  • the invention is therefore based on the object, starting from the prior art described at the outset, to provide a resistance heating element which, while being easy to manufacture, offers the fluid a very large surface area to be flushed per unit space.
  • the heating conductor also runs in a meandering manner in a transverse plane perpendicular to the longitudinal plane in such a way that at least two meandering segments connected to one another are arranged one behind the other.
  • the invention preferably relates to a small-sized resistance heating element.
  • the element shown in FIGS. 2 and 3 has a width of 20 mm, a height of 40 mm and a length of 50 mm.
  • the large length in turn causes large changes in length in the event of temperature changes which have to be absorbed without the fixed mounting of the metal element suffering as a result.
  • the resistance heating element 1 essentially consists of two bearing plates 2 and 3, which are arranged at a vertical distance from one another and preferably consist of plastic. For the sake of simplicity, reference will now be made to the upper bearing plate 2 and the lower bearing plate 3 with reference to FIGS. 2 to 5.
  • the one-piece resistance metal element is arranged between the bearing plates.
  • the resistance metal element essentially consists of a one-piece sheet metal stamping strip 4 which forms meandering stamped segments arranged one behind the other, the segments arranged one behind the other also being curved in a meandering manner.
  • a particularly advantageous spatial shape of the sheet metal stamping strip 4 for the purposes of the invention results from a circuit board 5, which is shown in plan view in FIG. 1.
  • the board consists of a one-piece sheet metal strip, for example a width of 2 mm and a thickness of 0.3 mm.
  • the spatial shape of the board is u. a. optimized with regard to the punched sheet metal waste.
  • the three-dimensional shape of the circuit board 5 is mirror-symmetrical to the longitudinal axis 10 and has at least one contact segment 6 and one loop segment 7.
  • the segments 6 and 7 are with Exception of an arc 7a formed mirror-symmetrically to a transverse axis 12. Between the segments 6 and 7 there can alternately be further extension segments 11 and 11 a, the segments 11 having the same shape in terms of space as the segment and the segments 11, with the exception of the arch 7 a, being the same as the segment 7.
  • Fig. 1 only a transverse axis 12 is drawn in, so as not to disturb the clarity. Nevertheless, the segments 11, 11a or 6 and 7 are mirror images of a transverse axis 12.
  • the contact segment 6 or an extension segment 11a consists of two current paths 6a and 6b punched out in a meandering pattern, which are arranged at a distance from one another in each case in a plane, the paths 6a and 6b having the same spatial shape in mirror symmetry with respect to the axis 10.
  • Each path 6a, 6b has a strip 8 extending next to the axis 10 and parallel to it in the direction of the loop segment 7, which opens into an arc 8a directed away from the axis 10, to which a returning strip runs parallel to the strip 8 8b, which in turn opens into a second bend 8c directed away from the axis 10, from which a strip 8d running parallel to the axis 10 leads to the loop segment 7 or to an extension segment 11.
  • the arches 8a and 8c are preferably designed as 180 ° arcs (semicircular arches), so that when viewed from above, an ideal punched out meandering shape results.
  • meandering current paths can be integrally connected to the side.
  • flatter arches 8a and / or 8c can be selected so that the strips 8 and 8b and / or 8b and 8c run divergingly.
  • the current path 6a has the same spatial shape as the current path 6b, which is why the same reference numerals have been used.
  • the loop segment 7 or an extension segment 11 also consists of two meandering current paths 13f and 13g, which are spaced apart in one plane next to the axis 10, the paths 13f and 13g having the same spatial shape symmetrically to the axis 10.
  • Each path 13f, 13g has a strip 13e which is coaxial with the strip 8d, i. H. the strip 8d merges in one piece in the region of an axis 12 into the strip 13e.
  • At the end of the strip 13e there is an arc 13a directed towards the longitudinal axis 10, which ends in a strip 13b running parallel to the strip 13e.
  • the strip 13b merges at the end opposite the curve 13a into a curve 13c directed towards the longitudinal axis 10, which is followed by a straight strip 13d running parallel to the strips 13e and 13b.
  • the path 13g merges into the path 13f, so that there is an integral, meandering punched-out electrical conductor from a stamped sheet metal strip, which is composed of the successive paths 6b, 13g, 13f and 6a, which are connected to each other with the bow 7a. If a power source is placed on the contact strips 8, the sheet metal strip can heat up as a resistance element.
  • arches 13a and 13c of the paths 13g and 13f are shown as 180 ° arcs, so that when viewed from above, an ideal punched out meandering shape also results.
  • meandering current paths can be integrally connected to the side.
  • flatter arches 13a and / or 13c can be selected so that the strips 13d and 13b as well as 13b and 13e run divergingly.
  • the contact strip 8 of the path 6b is preferably shorter than the contact strip of the path 6a.
  • Fig. 1 an expedient shape can be seen, in which the contact strip marked with the reference number 9 of the path 6a longer and in the top view in a Z-shape bent into the plane of the contact strip 8 of the path 6b such that the end of the contact strip 9 coaxial with Contact strip 8 of path 6b comes to rest.
  • extension segments 11, 11 correspond, as already mentioned, in terms of space to the segments 6 or 7. Accordingly, the same reference numerals are drawn in FIG. 1.
  • the segments are each bent over a transverse axis 12 or in the transverse axis region, such that an arc 14 leading downwards is followed by an upward arc 15, so that viewed in the direction of flow (FIG. 2), a resistance metal element bent in a meandering shape 4 results.
  • the arches 14 and 15 do not have to be round, but can also be angular, as shown in FIG. 2, and have a straight web 16. This shape is expedient for fastening the resistance metal element 4 in the bearing plates 2 and 3. It is important that the arches 14 and 15 create a sufficient distance or space 17 between adjacent segments 6 and 7 or 11 and 11 a or 6 and 11 and 11a and 7.
  • the intermediate space 17 advantageously allows the strips 8b, 8d and 8 after the arch regions 8c and 8a or the strips 13e, 13d and 13b after the arch regions 13a and 13c to be spread apart, as can be seen in FIG. 2, so that between the strips 8d and 8b and 8b and 8 or 13e and 13d and 13b and 13d a gap 18 is formed. This spreading leads to the fact that a large number of strips can be flowed against directly by the fluid flow, where in which the adjacent strips are laterally offset one behind the other in the flow direction. In this respect, an optimal heat absorption is brought about by the fluid.
  • the sheet metal stamping strip 4 which is punched out in a meandering shape and bent perpendicularly to the punched out meandering shape, is inserted with pins 25 in the bearing plates 2 and 3, the bearing plates 2 and 3 being kept at a distance by a web 19, 20.
  • the webs 19, 20 are preferably formed in one piece on the bearing plate 2, each engage with a corresponding opening 21 in the bearing plate 3 with their latching arms 31 spaced apart by a U-shaped recess 30 (FIG. 5) and snap behind with their latching lugs 22 an edge of the respective opening 21, the depth of the recess 30 being dimensioned such that the bottom of the U-shaped recess 30 sits on the bottom of the bearing plate 3, which results in the spacing.
  • the web 20 has recesses 23, 24 which are arranged vertically one above the other and which extend from the outward, ie. H. contact ends 8 and 9 bent towards the web 20 are penetrated (FIG. 2), so that easily accessible connections for a power source are created.
  • bearing pins 25 in the area of the arches 14 and 15, preferably in the web 16 are each connected to a side edge which is bent at right and upward angles, a slot 26 (FIG 3, 5) reach through in the bearing plate 2, 3 in a form-fitting manner, preferably with a press fit, and are bent over in the free end region approximately in the manner of a rivet, so that they cannot easily slide out of the slot 26.
  • the journals 25 are shaped so that they sit immovably in the slot 26.
  • the journals each have a step 25a on the two longitudinal edges, which step on the bottom of the bearing plate 2 or 3, since the slot 26 is made narrower than the width of a bearing journal 25 in the area of the steps 25a , so that only the area of a pin 25 protruding beyond the steps 25a passes through the slot 26.
  • This type of fastening should expediently create a distance between the arches 14 and 15 and 13a, 13c and 8a, 8c from the bottom of an adjacent bearing plate 2, 3, so that the segments 6, 7 and 11, 11a face the bottom of the bearing plates 2 , 3 can expand unhindered in the event of thermal expansion of the segments.
  • the fastening pins 25 are located in the bending areas 14, 15, in which the changes in length during temperature changes are practically negligible. Rather, the temperature-related changes in length are effective in the curved areas 13a, 13c and 8a, 8c, in that the segments can approach the bearing plates in these areas.
  • sliding pegs 27 (FIG. 3) protruding upwards or downwards in the material plane of the paths are connected in the arch regions mentioned, pass through the correspondingly corresponding slots 28 in the bottom of the plates 2, 3 and can slide freely in these slots 28 in the event of thermal expansion or shrinkage of the segments.
  • the bearing plates 2, 3 have frame-like webs 29 pointing outwards.
  • the new resistance heating element ensures a much larger surface in a small space compared to the proposal described, so that better heat emission can also be achieved.
  • the creation of the special spatial shape described makes it possible to form a resistance heating element which provides a meandering shape both in the direction of flow and perpendicular to it.
  • circuit board It is particularly advantageous for the manufacture of the circuit board to provide a connecting web between the arches 13a and 8a or 8a and 13c, which is produced to form a sliding pin 27 by an S-shaped or Z-shaped separating cut without loss of material.

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  • Resistance Heating (AREA)

Description

Die Erfindung betrifft ein Widerstandsheizelement mit einem aus einem einstückigen Blechstanzteilstreifen bestehenden, in einer Längsebene mäanderförmig verlaufenden Heizleiter, wobei der Blechstanzteilstreifen jeweils im Bereich von Mäanderbögen in einem Halter verschieblich gehalten ist.The invention relates to a resistance heating element with a heating conductor consisting of a one-piece sheet metal stamping strip and running in a meandering manner in a longitudinal plane, the sheet metal stamping strip being slidably held in the holder in the region of meandering arches.

Ein derartiges Widerstandsheizelement eignet sich z. B. für eine Ansaugluftleitung zwischen dem Vergaser und dem Motorblock eines Verbrennungsmotors, wobei das Widerstandsheizelement von einem Fluid umspült wird, um dieses zu erwärmen.Such a resistance heating element is suitable for. B. for an intake air line between the carburetor and the engine block of an internal combustion engine, wherein the resistance heating element is flushed with a fluid to heat it.

Ein derartiges Widerstandsheizelement ist aus der DE-C-650 676 bekannt. Hierbei wird der mäanderförmige Heizleiter aus einem rechteckigen Blechstreifen hergestellt, in dem letzterer abwechselnd von den beiden Längsseiten her eingeschnitten wird. Die hierdurch entstehenden, zueinander parallelen Streifen werden dann in jeweils entgegengesetzte Richtungen aus der Ble- 'chebene herausgebogen, wobei jedoch die die Streifen verbindenden Bogenbereiche in der ursprünglichen Blechebene verbleiben und in Nuten eines Halters verschieblich gelagert werden.Such a resistance heating element is known from DE-C-650 676. Here, the meandering heating conductor is made from a rectangular sheet metal strip, in which the latter is cut alternately from the two long sides. The resulting parallel strips are then bent out of the sheet plane in opposite directions, but the arc regions connecting the strips remain in the original sheet plane and are slidably supported in the grooves of a holder.

Aus der US-A-1 923 644 ist ebenfalls ein Widerstandsheizelement bekannt, das ein mäanderförmig geführtes und aus einem einstückigen Blechstanzteil bestehendes Heizleiterelement aufweist. Dieser Heizleiter ist im wesentlichen bis auf eine Wellung - als ebenes, rechteckiges Element ausgebildet.From US-A-1 923 644 a resistance heating element is also known, which has a meandering heating conductor element consisting of a one-piece stamped sheet metal part. This heating conductor is essentially made up of a corrugation - as a flat, rectangular element.

Die DE-A 1-2 703 293 beschreibt ein Heizregister mit einem Gehäuse, in dem ein Flachstreifen aus metallischem Widerstandswerkstoff untergebracht ist. Der Flachstreifen weist Einschnitte auf, die abwechselnd von den gegenüberliegenden Längskanten aus mit entgegengesetzter Richtung eingebracht sind. In. einem Ausführungsbeispiel ist der Blechstreifen dann ziehharmonikaartig auseinandergezogen. In einem weiteren Beispiel ist der Streifen ringförmig gebogen.DE-A 1-2 703 293 describes a heating register with a housing in which a flat strip made of metallic resistance material is accommodated. The flat strip has incisions which are made alternately from the opposite longitudinal edges in the opposite direction. In. In one embodiment, the metal strip is then pulled apart like an accordion. In another example, the strip is bent in a ring.

Der Erfindung liegt daher die Aufgabe zugrunde, ausgehend von dem eingangs beschriebenen Stand der Technik ein Widerstandsheizelement zu schaffen, das bei einfacher Herstellbarkeit dem Fluid eine sehr große umspülbare Oberfläche pro Raumeinheit bietet.The invention is therefore based on the object, starting from the prior art described at the outset, to provide a resistance heating element which, while being easy to manufacture, offers the fluid a very large surface area to be flushed per unit space.

Erfindungsgemäß wird dies dadurch erreicht, daß der Heizleiter auch in einer zu der Längsebene senkrechten Querebene derart mäanderförmig verläuft, daß mindestens zwei miteinander verbundene Mäander-Segmente hintereinander angeordnet sind.This is achieved according to the invention in that the heating conductor also runs in a meandering manner in a transverse plane perpendicular to the longitudinal plane in such a way that at least two meandering segments connected to one another are arranged one behind the other.

In der nicht vorveröffentlichten EP-A2-0 101 560, die zum Stand der Technik gemäß Artikel 54(3) und (4) EPÜ gehört, ist zwar bereits ein Widerstandsheizelement vorgeschlagen worden, bei dem zwei mäanderförmige Segmente vorhanden sind, jedoch sind diese nicht hintereinander, sondern vielmehr nebeneinander in der gleichen Ebene angeordnet.In the unpublished EP-A2-0 101 560, which belongs to the state of the art according to Article 54 (3) and (4) EPC, a resistance heating element has already been proposed in which two meandering segments are present, but these are not one behind the other, but rather arranged side by side in the same plane.

Vorteilhafte Weiterbildungen der Erfindung sind in den Unteransprüchen gekennzeichnet.Advantageous developments of the invention are characterized in the subclaims.

Anhand der Zeichnungen wird die Erfindung beispielhaft näher erläutert. Es zeigen :

  • Fig. 1 die mäanderförmig ausgestanzte Platine eines Widerstandsmetallelements in einem noch ungebogenen Zwischenfabrikationsstadium ;
  • Fig 2 eine Seitenansicht eines aus der Platine von Fig. 1 hergestellten, erfindungsgemäßen Widerstandsheizelements ;
  • Fig. 3 eine Frontansicht des Widerstandsheizelements von Fig. 2 ;
  • Fig. 4 eine Seitenansicht der in Fig. 2 gezeigten Lagerplatten des erfindungsgemäßen Widerstandsheizelementes ;
  • Fig. 5 einen Schnitt entlang der Linie V-V in Fig. 4 mit Blickrichtung in Pfeilrichtung.
The invention is explained in more detail by way of example with reference to the drawings. Show it :
  • Figure 1 shows the meandering stamped board of a resistance metal element in a still unbent intermediate manufacturing stage.
  • FIG. 2 shows a side view of a resistance heating element according to the invention produced from the circuit board of FIG. 1;
  • Fig. 3 is a front view of the resistance heating element of Fig. 2;
  • FIG. 4 shows a side view of the bearing plates of the resistance heating element according to the invention shown in FIG. 2;
  • Fig. 5 shows a section along the line VV in Fig. 4 looking in the direction of the arrow.

Gegenstand der Erfindung ist vorzugsweise ein Widerstandsheizelement in Kleinbauweise. Beispielsweise weist das in Fig. 2 und 3 abgebildete Element eine Breite von 20 mm, eine Höhe von 40 mm und eine Länge von 50 mm auf. Bei derart kleinen Abmessungen ist es generell schwierig, die Widerstandsmetallelemente erschütterungsfest zu lagern und eine große Länge bzw. möglichst viele Bögen vorzusehen, damit eine relativ große Oberfläche des Metallelementes zur Verfügung steht. Die große Länge wiederum bedingt große Längenänderungen bei Temperaturwechseln, die aufgefangen werden müssen, ohne daß die feste Lagerung des Metallelementes darunter leidet.The invention preferably relates to a small-sized resistance heating element. For example, the element shown in FIGS. 2 and 3 has a width of 20 mm, a height of 40 mm and a length of 50 mm. With such small dimensions, it is generally difficult to store the resistance metal elements in a vibration-proof manner and to provide a large length or as many bends as possible so that a relatively large surface area of the metal element is available. The large length in turn causes large changes in length in the event of temperature changes which have to be absorbed without the fixed mounting of the metal element suffering as a result.

Das erfindungsgemäße Widerstandsheizelement 1 besteht im wesentlichen aus zwei Lagerplatten 2 und 3, die in einem senkrechten Abstand voneinander angeordnet sind und vorzugsweise aus Kunststoff bestehen. Der Einfachheit halber wird im folgenden mit Bezug auf die Fig. 2 bis 5 von der oberen Lagerplatte 2 und von der unteren Lagerplatte 3 die Rede sein. Zwischen den Lagerplatten ist das einstückige Widerstandsmetallelement angeordnet.The resistance heating element 1 according to the invention essentially consists of two bearing plates 2 and 3, which are arranged at a vertical distance from one another and preferably consist of plastic. For the sake of simplicity, reference will now be made to the upper bearing plate 2 and the lower bearing plate 3 with reference to FIGS. 2 to 5. The one-piece resistance metal element is arranged between the bearing plates.

Das Widerstandsmetallelement besteht im wesentlichen aus einem einstückigen Blechstanzteilstreifen 4 der mäanderförmig ausgestanzte, hintereinander angeordnete Segmente bildet, wobei die hintereinander angeordneten Segmente ebenfalls mäanderförmig gebogen sind.The resistance metal element essentially consists of a one-piece sheet metal stamping strip 4 which forms meandering stamped segments arranged one behind the other, the segments arranged one behind the other also being curved in a meandering manner.

Eine besonders vorteilhafte Raumform des Blechstanzteilstreifens 4 für die Zwecke der Erfindung ergibt sich aus einer Platine 5, die in Fig. 1 in der Draufsicht abgebildet ist. Die Platine besteht aus einem einstückigen Blechstreifen beispielsweise einer Breite von 2 mm und einer Dicke von 0,3 mm. Die Raumform der Platine ist u. a. bezüglich des ausgestanzten Blechabfalls optimiert.A particularly advantageous spatial shape of the sheet metal stamping strip 4 for the purposes of the invention results from a circuit board 5, which is shown in plan view in FIG. 1. The board consists of a one-piece sheet metal strip, for example a width of 2 mm and a thickness of 0.3 mm. The spatial shape of the board is u. a. optimized with regard to the punched sheet metal waste.

Die Raumform der Platine 5 ist spiegelsymmetrisch zur Längsachse 10 ausgebildet und weist zumindest ein Kontaktsegment 6 und ein Schleifensegment 7 auf. Die Segmente 6 und 7 sind mit Ausnahme eines Bogens 7a spiegelsymmetrisch zu einer Querachse 12 ausgebildet. Zwischen den Segmenten 6 und 7 können sich im Wechsel noch weitere Verlängerungssegmente 11 und 11 a befinden, wobei die Segmente 11 raumformmäßig dem Segment und die Segmente 11, mit Ausnahme des Bogens 7a, dem Segment 7 gleichen. In Fig. 1 ist lediglich eine Querachse 12 eingezeichnet, um die Übersichtlichkeit nicht zu stören. Gleichwohl liegen die Segmente 11, 11a bzw. 6 und 7 spiegelbildlich zu jeweils einer Querachse 12.The three-dimensional shape of the circuit board 5 is mirror-symmetrical to the longitudinal axis 10 and has at least one contact segment 6 and one loop segment 7. The segments 6 and 7 are with Exception of an arc 7a formed mirror-symmetrically to a transverse axis 12. Between the segments 6 and 7 there can alternately be further extension segments 11 and 11 a, the segments 11 having the same shape in terms of space as the segment and the segments 11, with the exception of the arch 7 a, being the same as the segment 7. In Fig. 1, only a transverse axis 12 is drawn in, so as not to disturb the clarity. Nevertheless, the segments 11, 11a or 6 and 7 are mirror images of a transverse axis 12.

Da die Segmente, 6, 7, 11 und 11a wie beschrieben symmetrisch geformt sind, reicht es aus, lediglich die Segmente 6 und 7 zu kennzeichnen.Since the segments 6, 7, 11 and 11a are shaped symmetrically as described, it is sufficient to mark only the segments 6 and 7.

Das Kontaktsegment 6 oder ein Verlängerungssegment 11a besteht aus zwei mäanderförmig ausgestanzten Strompfaden 6a und 6b, die in einer Ebene jeweils neben der Achse 10 auf Abstand angeordnet sind, wobei die Pfade 6a und 6b spiegelsymmetrisch zur Achse 10 die gleiche Raumform besitzen. Jeder Pfad 6a, 6b verfügt über einen neben der Achse 10 und parallel dazu in Richtung auf das Schleifensegment 7 sich erstreckenden Streifen 8, der in einen von der Achse 10 weg gerichteten Bogen 8a mündet, an den sich ein zurückführender parallel zum Streifen 8 verlaufender Streifen 8b anschließt, der seinerseits in einen zweiten, von der Achse 10 weg gerichteten Bogen 8c mündet, von dem ein parallel zur Achse 10 verlaufender Streifen 8d zum Schleifensegment 7 oder zu einem Verlängerungssegment 11 führt. Die Bögen 8a und 8c sind vorzugsweise als 180°-Bögen (Halbkreisbögen) ausgebildet, so daß sich in der Draufsicht betrachtet eine ideale ausgestanzte Mäanderform ergibt. Darüber hinaus können weitere, insbesondere gleich ausgebildete mäanderförmig ausgestanzte Strompfade zur Seite hin einstückig angeschlossen sein. Weiterhin können flachere Bögen 8a und/oder 8c gewählt werden, so daß die Streifen 8 und 8b und/oder 8b und 8c divergierend verlaufen.The contact segment 6 or an extension segment 11a consists of two current paths 6a and 6b punched out in a meandering pattern, which are arranged at a distance from one another in each case in a plane, the paths 6a and 6b having the same spatial shape in mirror symmetry with respect to the axis 10. Each path 6a, 6b has a strip 8 extending next to the axis 10 and parallel to it in the direction of the loop segment 7, which opens into an arc 8a directed away from the axis 10, to which a returning strip runs parallel to the strip 8 8b, which in turn opens into a second bend 8c directed away from the axis 10, from which a strip 8d running parallel to the axis 10 leads to the loop segment 7 or to an extension segment 11. The arches 8a and 8c are preferably designed as 180 ° arcs (semicircular arches), so that when viewed from above, an ideal punched out meandering shape results. In addition, further, in particular identically formed, meandering current paths can be integrally connected to the side. Furthermore, flatter arches 8a and / or 8c can be selected so that the strips 8 and 8b and / or 8b and 8c run divergingly.

Der Strompfad 6a besitzt, wie bereits erwähnt, die gleiche Raumform wie der Strompfad 6b, weshalb die gleichen Bezugszeichen verwendet worden sind.As already mentioned, the current path 6a has the same spatial shape as the current path 6b, which is why the same reference numerals have been used.

Das Schleifensegment 7 oder ein Verlängerungssegment 11 besteht ebenfalls aus zwei mäanderförmig ausgestanzten Strompfaden 13f und 13g, die in einer Ebene jeweils neben der Achse 10 auf Abstand angeordnet sind, wobei die Pfade 13f und 13g spiegelsymmetrisch zur Achse 10 die gleiche Raumform besitzen. Jeder Pfad 13f, 13g weist einen Streifen 13e auf, der koaxial zum Streifen 8d liegt, d. h. der Streifen 8d geht einstückig im Bereich einer Achse 12 in den Streifen 13e über. Am Ende des Streifens 13e befindet sich ein zur Längsachse 10 gerichteter Bogen 13a, der in einen parallel zum Streifen 13e verlaufenden Streifen 13b mündet. Der Streifen 13b geht an dem dem Bogen 13a gegenüberliegenden Ende in einen zur, Längsachse 10 gerichteten Bogen 13c über, an den sich ein gerader und parallel zum Streifen 13e und 13b verlaufender Streifen 13d anschließt.The loop segment 7 or an extension segment 11 also consists of two meandering current paths 13f and 13g, which are spaced apart in one plane next to the axis 10, the paths 13f and 13g having the same spatial shape symmetrically to the axis 10. Each path 13f, 13g has a strip 13e which is coaxial with the strip 8d, i. H. the strip 8d merges in one piece in the region of an axis 12 into the strip 13e. At the end of the strip 13e there is an arc 13a directed towards the longitudinal axis 10, which ends in a strip 13b running parallel to the strip 13e. The strip 13b merges at the end opposite the curve 13a into a curve 13c directed towards the longitudinal axis 10, which is followed by a straight strip 13d running parallel to the strips 13e and 13b.

Mit einem Bogen 7a, der an dem dem Bogen 13c gegenüberliegenden Ende des Streifens 13d beginnt, geht der Pfad 13g in den Pfad 13f über, so daß ein einstückiger, mäanderförmig ausgestanzter, elektrischer Leiter aus einem Blechstanzstreifen vorliegt, der sich aus den hintereinander gereihten Pfaden 6b, 13g, 13f und 6a zusammensetzt, die mit dem Bogen 7a miteinander verbunden sind. Wird an die Kontaktstreifen 8 eine Stromquelle gelegt, kann sich der Blechstreifen als Widerstandselement aufheizen.With a bend 7a, which begins at the end of the strip 13d opposite the bend 13c, the path 13g merges into the path 13f, so that there is an integral, meandering punched-out electrical conductor from a stamped sheet metal strip, which is composed of the successive paths 6b, 13g, 13f and 6a, which are connected to each other with the bow 7a. If a power source is placed on the contact strips 8, the sheet metal strip can heat up as a resistance element.

Die Bögen 13a und 13c der Pfade 13g und 13f sind wie die Bögen 8a und 8c der Pfade 6a und 6b als 180°-Bögen abgebildet, so daß sich in der Draufsicht betrachtet ebenfalls eine ideale ausgestanzte Mäanderform ergibt. Auch in diesem Fall können weitere, insbesondere gleich ausgebildete, mäanderförmig ausgestanzte Strompfade zur Seite hin einstückig angeschlossen sein. Ferner können flachere Bögen 13a und/oder 13c gewählt werden, so daß die Streifen 13d und 13b sowie 13b und 13e divergierend verlaufen.The arches 13a and 13c of the paths 13g and 13f, like the arches 8a and 8c of the paths 6a and 6b, are shown as 180 ° arcs, so that when viewed from above, an ideal punched out meandering shape also results. In this case too, further, in particular identically designed, meandering current paths can be integrally connected to the side. Furthermore, flatter arches 13a and / or 13c can be selected so that the strips 13d and 13b as well as 13b and 13e run divergingly.

Vorzugsweise ist der Kontaktstreifen 8 des Pfades 6b kürzer ausgeführt als der Kontaktstreifen des Pfades 6a. In Fig. 1 ist eine zweckmäßige Form erkennbar, bei der der mit dem Bezugszeichen 9 gekennzeichnete Kontaktstreifen des Pfades 6a länger und in der Draufsicht Z-bogenförmig derart in die Ebene des Kontaktstreifens 8 des Pfades 6b gebogen, daß das Ende des Kontaktstreifens 9 koaxial zum Kontaktstreifen 8 des Pfades 6b zu liegen kommt.The contact strip 8 of the path 6b is preferably shorter than the contact strip of the path 6a. In Fig. 1 an expedient shape can be seen, in which the contact strip marked with the reference number 9 of the path 6a longer and in the top view in a Z-shape bent into the plane of the contact strip 8 of the path 6b such that the end of the contact strip 9 coaxial with Contact strip 8 of path 6b comes to rest.

Die Verlängerungssegmente 11, 11 entsprechen, wie bereits erwähnt, raumformmäßig den Segmenten 6 oder 7. In der Fig. 1 sind dementsprechend die gleichen Bezugszeichen eingezeichnet.The extension segments 11, 11 correspond, as already mentioned, in terms of space to the segments 6 or 7. Accordingly, the same reference numerals are drawn in FIG. 1.

Wesentlich ist, daß nach der Erfindung die Segmente jeweils um eine Querachse 12 bzw. in Querachsbereich umgebogen sind, derart, daß einem abwärts führenden Bogen 14 ein aufwärts führender Bogen 15folgt, so daß sich in Anströmrichtung betrachtet (Fig. 2) ein mäanderförmig gebogenes Widerstandsmetallelement 4 ergibt.It is essential that, according to the invention, the segments are each bent over a transverse axis 12 or in the transverse axis region, such that an arc 14 leading downwards is followed by an upward arc 15, so that viewed in the direction of flow (FIG. 2), a resistance metal element bent in a meandering shape 4 results.

Die Bögen 14 und 15 müssen nicht rund, sondern können auch eckig, wie in Fig. 2 abgebildet, ausgeführt sein und einen geraden Steg 16 aufweisen. Diese Form ist für die Befestigung des Widerstandsmetallelements 4 in den Lagerplatten 2 und 3 zweckmäßig. Wichtig ist, daß durch die Bögen 14 und 15 ein ausreichender Abstand bzw. Zwischenraum 17 zwischen benachbarten Segmenten 6 und 7 bzw. 11 und 11 a oder 6 und 11 und 11a und 7 geschaffen wird. Der Zwischenraum 17 gestattet in vorteilhafter Weise, die Streifen 8b, 8d und 8 nach den Bogenbereichen 8c und 8a bzw. die Streifen 13e, 13d und 13b nach den Bogenbereichen 13a und 13c entgegengesetzt auseinanderzuspreizen, was aus Fig. 2 ersichtlich ist, so daß zwischen den Streifen 8d und 8b sowie 8b und 8 bzw. 13e und 13d sowie 13b und 13d ein Spalt 18 gebildet wird. Dieses Aufspreizen führt dazu, daß sehr viele Streifen direkt vom Fluidstrom angeströmt werden können, wobei die benachbarten Streifen in Strömungsrichtung seitlich diagonal versetzt hintereinander angeordnet sind. Insofern wird eine optimale Wärmeaufnahme durch das Fluid bewirkt.The arches 14 and 15 do not have to be round, but can also be angular, as shown in FIG. 2, and have a straight web 16. This shape is expedient for fastening the resistance metal element 4 in the bearing plates 2 and 3. It is important that the arches 14 and 15 create a sufficient distance or space 17 between adjacent segments 6 and 7 or 11 and 11 a or 6 and 11 and 11a and 7. The intermediate space 17 advantageously allows the strips 8b, 8d and 8 after the arch regions 8c and 8a or the strips 13e, 13d and 13b after the arch regions 13a and 13c to be spread apart, as can be seen in FIG. 2, so that between the strips 8d and 8b and 8b and 8 or 13e and 13d and 13b and 13d a gap 18 is formed. This spreading leads to the fact that a large number of strips can be flowed against directly by the fluid flow, where in which the adjacent strips are laterally offset one behind the other in the flow direction. In this respect, an optimal heat absorption is brought about by the fluid.

Der mäanderförmig ausgestanzte und senkrecht zur ausgestanzen Mäanderform mäanderförmig gebogene Blechstanzteilstreifen 4 steckt mit Zapfen 25 in den Lagerplatten 2 und 3, wobei die Lagerplatte 2 und 3 durch einen Steg 19, 20 auf Abstand gehalten werden. Die Stege 19, 20 sind vorzugsweise einstückig an der Lagerplatte 2 angeformt, durchgreifen jeweils mit ihren durch eine U-förmige Ausnehmung 30 (Fig. 5) auf Abstand angeordneten Rastarmen 31 eine entsprechende Öffnung 21 in der Lagerplatte 3 und rasten mit ihren Rastnasen 22 hinter eine Kante der jeweiligen Öffnung 21, wobei die Tiefe der Ausnehmung 30 so bemessen ist, daß der Boden der U-förmigen Ausnehmung 30 auf dem Boden der Lagerplatte 3 aufsitzt, woraus die Abstandshaltung resultiert. Der Steg 20 weist senkrecht übereinander angeordnete Aussparungen 23, 24 auf, die von den nach außen, d. h. zum Steg 20 hin abgebogenen Kontaktenden 8 und 9 durchgriffen werden (Fig. 2), so daß leicht erreichbare Anschlüsse für eine Stromquelle geschaffen werden.The sheet metal stamping strip 4, which is punched out in a meandering shape and bent perpendicularly to the punched out meandering shape, is inserted with pins 25 in the bearing plates 2 and 3, the bearing plates 2 and 3 being kept at a distance by a web 19, 20. The webs 19, 20 are preferably formed in one piece on the bearing plate 2, each engage with a corresponding opening 21 in the bearing plate 3 with their latching arms 31 spaced apart by a U-shaped recess 30 (FIG. 5) and snap behind with their latching lugs 22 an edge of the respective opening 21, the depth of the recess 30 being dimensioned such that the bottom of the U-shaped recess 30 sits on the bottom of the bearing plate 3, which results in the spacing. The web 20 has recesses 23, 24 which are arranged vertically one above the other and which extend from the outward, ie. H. contact ends 8 and 9 bent towards the web 20 are penetrated (FIG. 2), so that easily accessible connections for a power source are created.

Zur festen Lagerung in den Lagerplatten 2 und 3 sind nach einer besonderen Ausführungsform der Erfindung Lagerzapfen 25 im Bereich der Bögen 14 und 15 vorzugsweise im Steg 16 jeweils an einer Seitenkante angebunden, die nach oben bzw. unten rechtwinklig abgebogen sind, einen Schlitz 26 (Fig. 3, 5) in der Lagerplatte 2, 3 formschlüssig, vorzugsweise mit Preßsitz, durchgreifen und im freien Endbereich etwa nach Art einer Nietung umgebogen sind, so daß sie nicht ohne weiteres aus dem Schlitz 26 herausgleiten können.For fixed mounting in the bearing plates 2 and 3, according to a particular embodiment of the invention, bearing pins 25 in the area of the arches 14 and 15, preferably in the web 16, are each connected to a side edge which is bent at right and upward angles, a slot 26 (FIG 3, 5) reach through in the bearing plate 2, 3 in a form-fitting manner, preferably with a press fit, and are bent over in the free end region approximately in the manner of a rivet, so that they cannot easily slide out of the slot 26.

Vorzugsweise sind die Lagerzapfen 25 so geformt, daß sie unverrückbar im Schlitz 26 sitzen. Zu diesem Zweck ist vorgesehen, daß die Lagerzapfen an den beiden Längskanten je eine Stufe 25a aufweisen, die auf dem Boden der Lagerplatte 2 bzw. 3 aufsitzen, da der Schlitz 26 schmaler ausgeführt ist als die Breite eines Lagerzapfens 25 im Bereich der Stufen 25a beträgt, so daß lediglich der über die Stufen 25a hinausragende Bereich eines Zapfens 25 den Schlitz 26 durchgreift. Diese Befestigungsart soll zweckmäßigerweise einen Abstand zwischen den Bögen 14 und 15 sowie 13a, 13c bzw. 8a, 8c vom Boden einer benachbarten Lagerplatte 2, 3 schaffen, so daß die Segmente 6, 7 bzw. 11,11a sich zu den Böden der Lagerplatten 2, 3 hin unbehindert ausdehnen können bei Wärmedehnungen der Segmente. Die Befestigungszapfen 25 befinden sich in den Biegebereichen 14, 15, in denen die Längenänderungen bei Temperaturwechseln praktisch vernachlässigbar sind. Die temperaturbedingten Längenänderungen werden vielmehr in den Bogenbereichen 13a, 13c bzw. 8a, 8c wirksam, indem sich die Segmente in diesen Bereichen den Lagerplatten nähern können. Um zu gewährleisten, daß in den Bogenbereichen eine gute Lagefixierung der Segmente in den Lagerplatten besteht, ist vorzugsweise vorgesehen, daß in den genannten Bogenbereichen nach oben bzw. unten abstehende, in der Materialebene der Pfade fluchtende Gleitzapfen 27 (Fig. 3) angebunden sind, die formschlüssig entsprechende Schlitze 28 im Boden der Platten 2, 3 durchgreifen und in diesen Schlitzen 28 bei Wärmedehnungen oder -schwindungen der Segmente auf- und abwärts unbehindert gleiten können.Preferably, the journals 25 are shaped so that they sit immovably in the slot 26. For this purpose it is provided that the journals each have a step 25a on the two longitudinal edges, which step on the bottom of the bearing plate 2 or 3, since the slot 26 is made narrower than the width of a bearing journal 25 in the area of the steps 25a , so that only the area of a pin 25 protruding beyond the steps 25a passes through the slot 26. This type of fastening should expediently create a distance between the arches 14 and 15 and 13a, 13c and 8a, 8c from the bottom of an adjacent bearing plate 2, 3, so that the segments 6, 7 and 11, 11a face the bottom of the bearing plates 2 , 3 can expand unhindered in the event of thermal expansion of the segments. The fastening pins 25 are located in the bending areas 14, 15, in which the changes in length during temperature changes are practically negligible. Rather, the temperature-related changes in length are effective in the curved areas 13a, 13c and 8a, 8c, in that the segments can approach the bearing plates in these areas. In order to ensure that there is a good positional fixation of the segments in the bearing plates in the arch regions, it is preferably provided that sliding pegs 27 (FIG. 3) protruding upwards or downwards in the material plane of the paths are connected in the arch regions mentioned, pass through the correspondingly corresponding slots 28 in the bottom of the plates 2, 3 and can slide freely in these slots 28 in the event of thermal expansion or shrinkage of the segments.

Zum Schutz der außenseitigen Flächen der Böden der Lagerplatten 2, 3 ist zweckmäßigerweise vorgesehen, daß die Lagerplatten 2, 3 nach außen weisende rahmenartige Stege 29 besitzen.To protect the outside surfaces of the bottoms of the bearing plates 2, 3 it is expediently provided that the bearing plates 2, 3 have frame-like webs 29 pointing outwards.

Das neue Widerstandsheizelement gewährleistet auf kleinstem Raum gegenüber dem beschriebenen Vorschlag eine wesentlich größere Oberfläche, so daß auch eine bessere Wärmeabgabe bewirkt werden kann. Die Schaffung der beschriebenen besonderen Raumform ermöglicht ein Widerstandsheizelement zu bilden, das eine Mäanderform sowohl in Strömungsrichtung als auch senkrecht dazu zur Verfügung stellt.The new resistance heating element ensures a much larger surface in a small space compared to the proposal described, so that better heat emission can also be achieved. The creation of the special spatial shape described makes it possible to form a resistance heating element which provides a meandering shape both in the direction of flow and perpendicular to it.

Anstelle der Bögen 13a, 13c bzw. 8a, 8c können auch einfache gerade verlaufende oder anders als bogenförmig geformte Stege ausgestanzt sein, die zwischen den Streifen 13e, 13d und 13b bzw. 8d, 8b und 8 liegen.Instead of the arches 13a, 13c and 8a, 8c, simple straight webs or webs which are shaped differently than in an arc shape can also be punched out and lie between the strips 13e, 13d and 13b or 8d, 8b and 8.

Besonders vorteilhaft für die Herstellung der Platine ist, einen Verbindungssteg zwischen den Bögen 13a und 8a bzw. 8a und 13c vorzusehen, der zur Bildung je eines Gleitzapfens 27 durch einen S- oder Z-förmigen Trennschnitt ohne Materialverlust erzeugt wird.It is particularly advantageous for the manufacture of the circuit board to provide a connecting web between the arches 13a and 8a or 8a and 13c, which is produced to form a sliding pin 27 by an S-shaped or Z-shaped separating cut without loss of material.

Claims (29)

1. Resistance heating element (1) with a heating conductor consisting of a one-piece strip (4) of a punched sheet metal part, extending in a meandering form in a longitudinal plane (Fig. 3), whereby the strip (4) of a punched sheet metal part is secured in each case in the area of meander bends (14,15) in a holder (2, 3, 19, 20) so as to be displaceable (27, 28), characterised in that the heating conductor also extends in a meandering form in a transverse plane (Fig. 2) perpendicular to the longitudinal plane (Fig. 3), such that at least two meander segments (6, 7, 11, 11 a) connected together are arranged one behind the other.
2. Resistance heating element according to Claim 1, characterised in that the individual meander segments (6, 7, 11, 11 a) are arranged parallel to one another (Fig. 2).
3. Resistance heating element according to Claim 1 or 2, characterised in that the strip (4) of a punched sheet metal part is manufactured from a blank (5), the spatial form whereof is formed mirror-symmetrical to a longitudinal axis (10), and has at least one contact segment (6) and one loop segment (7).
4. Resistance heating element according to Claim 3, characterised in that the segments (6 and 7) with the exception of one bend (7a) are formed mirror-symmetrical to a transverse axis (12).
5. Resistance heating element according to Claim 4, characterised in that between the contact segment (6) and the loop segment (7) extension segments (11 and 11a) are arranged, which in terms of spatial form are either like the contact segment (6) or, with the exception of the bend (7a), like the loop segment (7).
6. Resistance heating element according to Claim 5, characterised in that the segments (11, 11 a or 6 and 7) are formed as mirror images with respect to a respective transverse axis (12).
7. Resistance heating element according to Claim 5 or 6, characterised in that the contact segment (6) or the extension segment (11a) consists of two current paths (6a and 6b), punched out in the form of a meander, which are arranged each in a plane alongside the longitudinal axis (10) at a distance therefrom, whereby the current paths (6a and 6b) have the same spatial form mirror-symmetrical to the longitudinal axis (10).
8. Resistance heating element according to Claim 7, characterised in that each current path (6a, 6b) has a contact strip (8) extending alongside the longitudinal axis (10) and parallel to it in the direction of the loop element (7), which strip opens into a bend (8a) directed away from the longitudinal axis (10), to which bend a returning strip (8b) running parallel to the contact strip (8) is connected, which strip in its turn opens into a second bend (8c) directed away from the longitudinal axis (10), from which bend a strip (8d) running parallel to the longitudinal axis (10) leads to the loop segment (7) or to one of the extension segments (11).
9. Resistance heating element according to Claim 8, characterised in that the bends (8a and 8c) are formed as 180° bends.
10. Resistance heating element according to one of Claims 5 to 9, characterised in that the loop segment (7) or the extension segment (11) consists of two punched out current paths (13f and 13g) in the form of meanders, which are each arranged in a plane alongside the longitudinal axis (10) at a distance therefrom, whereby the current paths (13f and 13g) have the same spatial form mirror-symmetrical to the longitudinal axis (10).
11. Resistance heating element according to Claim 10, characterised in that each current path (13f, 13g) has a strip (13e) which lies coaxially to the strip (8d), in that at the end of the strip (13e) there is a bend (13a) directed towards the longitudinal axis (10), which bend opens into a strip (13b) running parallel to the strip (13e), and in that the strip (13b) at the end opposite the bend (13a) passes into a bend (13c) directed towards the longitudinal axis (10), to which bend a strip (13d) running straight and parallel to the strip (13e and 13b) is connected.
12. Resistance heating element according to Claims 4 and 10 or 11, characterised in that the current path (13g) passes via the bend (7a) into the current path (13f).
13. Resistance heating element according to one or more of Claims 1 to 12, characterised in that the strip (4) of a punched sheet metal part consists of the paths (6b, 13g, 13f and 6a) arranged in rows behind one another, which paths are connected together by means of the bend (7a).
14. Resistance heating element according to one or more of Claims 1 to 13, characterised by contact strips (8 and 9) of varying lengths.
15. Resistance heating element according to Claim 14, characterised in that the contact strip (9) of the path (6a) is longer and in plan view is bent in the form of a bend with the longer partial section into the plane of the contact strip (8) of the path (6d)..
16. Resistance heating element according to one or more of Claims 1 to 15, characterised in that the segments (6, 7, 11 and 11 a) are each bent about a transverse axis (12), such that an upwards leading bend (15) follows a downwards leading bend (14).
17. Resistance heating element according to Claim 16, characterised in that the bends (14 and 15) have a straight, preferably horizontal bridge (16).
18. Resistance heating element according to Claim 16 or 17, characterised in that an intervening space (17) is formed by the bends (14 and 15) between adjacent segments (6 and 7 or 11 and 11a or 6 and 11 and 11a and 7).
19. Resistance heating element according to Claim 18, characterised that the strips (8d, 8b and 8 or 13e, 13d and 13b) after the bend areas (8c and 8a or 13c and 13a) are spread apart or angled down in opposition from the blank level so that a gap (18) is formed between the strips.
20. Resistance heating element according to one or more of Claims 1 to 19, characterised in that the strip (4) of a punched sheet metal part is held with bearing pins (25) in bearing plates (2 and 3) formed as holders, which plates are arranged at a vertical distance from one another and are made of an insulating material.
21. Resistance heating element according to Claim 20, characterised in that the bearing plates (2 and 3) are kept at a distance by two bridges (19,
20), whereby the bridges (19, 20) are preferably formed in one piece onto one bearing plate (2), penetrate with their respective locking arms (31), arranged at a distance by a U-shaped recess (30), a corresponding opening (21) in the other bearing plate (3) and with their locking noses (22) lock behind one edge of the respective opening (21), whereby the depth of the recess (30) is dimensioned so that the bottom of the U-shaped recess (30) rests on the bottom of the other bearing plate (3).
22. Resistance heating element according to Claim 20 or 21, characterised in that the one bridge (20) has recesses (23, 24) arranged vertically on top of one another, which are penetrated by the contact ends (8 and 9) of the heating conductor, bent down outwards.
23. Resistance heating element according to one of Claims 20 to 22, characterised in that for a secure mounting.in the bearing plates (2 and 3) the bearing pins (25) in the area of the bends (14 and 15), preferably in the bridge (16), are each connected to a side edge and are bent at right angles upwards or downwards, penetrate a slot (26) in the bearing plate (2, 3) in a positive lock, preferably with a press fit, and are bent over in the free end section approximately like a rivet.
24. Resistance heating element according to Claim 23, characterised in that the bearing pins (25) rest immovably in the slot (26).
25. Resistance heating element according to Claim 24, characterised in that the bearing pins (25) on the two longitudinal edges each has a step (25a) and the steps (25a) rest on the bottom of the bearing plate (2 or 3).
.26. Resistance heating element according to one of Claims 20 to 25, characterised in that between the bends (14 and 15 and 13a, 13c or 8a, 8c) and the bottom of one of the adjacent bearing plates (2, 3) a space is provided.
27. Resistance heating element according to one or more of Claims 20 to 26, characterised in that in the bend areas (13a, 13c or 8a, 8c) sliding pins (27) are connected, protruding upwards or downwards, aligned In the material plane of the current paths (6a, 6b or 13g, 13f), which pins penetrate the corresponding slots (28) in the bottom of the bearing plates (2, 3) in a positive lock, and can slide in these slots.
28. Resistance heating element according to one of Claims 20 to 27, characterised in that the bottoms of the bearing plates (2, 3) have frame- like bridges (29) pointing outwards.
EP84108800A 1983-08-03 1984-07-25 Electric resistance heating element Expired EP0135704B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3328078 1983-08-03
DE19833328078 DE3328078A1 (en) 1983-08-03 1983-08-03 RESISTANCE HEATING ELEMENT

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EP0135704A1 EP0135704A1 (en) 1985-04-03
EP0135704B1 true EP0135704B1 (en) 1988-11-09

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Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3605611A1 (en) * 1986-02-21 1987-08-27 Braun Ag Method for producing a heating element
EP0355210A1 (en) * 1988-08-26 1990-02-28 Koninklijke Philips Electronics N.V. Heating element
US5281944A (en) * 1991-04-25 1994-01-25 Mosebach Manufacturing Company Slide-in resistor grid
DE4121075A1 (en) * 1991-06-26 1993-01-14 Pierburg Gmbh Heating element arrangement in combustion engine inlet manifold - comprises filter for mixt. of air and fuel with provision for electric heating by direct current
US5304978A (en) * 1992-08-10 1994-04-19 Mosebach Manufacturing Company Resistor grid assembly having "U" bend resistor elements
GB2323479A (en) * 1997-03-19 1998-09-23 Eaton Ltd Mounting resistor elements
DE29706870U1 (en) * 1997-04-16 1997-06-05 Behr Gmbh & Co, 70469 Stuttgart Electric heating device, in particular for a motor vehicle
DE10048424A1 (en) * 2000-09-29 2002-04-18 Bsh Bosch Siemens Hausgeraete Heating element for domestic appliances e.g. toaster, blower heater or hair dryer, includes sections not passing current supplied
DE20108585U1 (en) * 2001-05-21 2002-10-02 RUBITHERM GmbH, 20457 Hamburg Electric underfloor heating and thermal fuse
FR3015351B1 (en) * 2013-12-23 2016-02-05 Michelin & Cie PNEUMATIC ENVELOPE COMPRISING A CARCASS, A TREAD BAND AND A HEATING LAYER
EP3616221A1 (en) * 2017-04-25 2020-03-04 Yazaki Europe Limited Power resistor
DE102020111987B4 (en) * 2020-05-04 2024-06-27 Kraftanlagen Energies & Services Se Heating device

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1233183A (en) * 1916-06-05 1917-07-10 Gen Electric Electrical heating unit and method of making the same.
US2162030A (en) * 1930-04-21 1939-06-13 Capstan Glass Co Heating device for glass lehrs and the like
US1923644A (en) * 1932-01-11 1933-08-22 Pittsburgh Res Corp Electric heating furnace
DE650676C (en) * 1934-08-31 1937-09-29 Bbc Brown Boveri & Cie Band heater for electrical resistance ovens
US2736786A (en) * 1953-11-12 1956-02-28 Bois Robert E Du Resistor structure
US2812410A (en) * 1955-05-16 1957-11-05 Robert E Dubois Resistor structure
US2858402A (en) * 1956-04-27 1958-10-28 Euclid Electric & Mfg Company Forced ventilated resistor stack
GB1132965A (en) * 1964-12-01 1968-11-06 Eisler Paul Improvements in the manufacture of patterns of slits in a web
US3673387A (en) * 1971-02-22 1972-06-27 Emerson Electric Co Electric heaters
AT354579B (en) * 1971-11-03 1979-01-10 Lueder Holger Dr DEVICE FOR ELECTRIC LARGE AREA HEATING AND PROCESS FOR THEIR PRODUCTION
IN139058B (en) * 1974-06-21 1976-05-01 Mosebach Mfg Co
US4051452A (en) * 1975-08-18 1977-09-27 Cutler-Hammer, Inc. Annular resistor
DE2625087A1 (en) * 1976-06-04 1977-12-15 Fritz Ing Grad Kraehmer Closure for anus praeternaturalis - with grooved ring for mounting cap and belt terminating in coupling pins
CH613329A5 (en) * 1977-01-05 1979-09-14 Petz Elektro Waerme Techn Resistance heating element for a heating device
US4100526A (en) * 1977-02-24 1978-07-11 Mosebach Manufacturing Company Grid resistor
US4146868A (en) * 1978-02-28 1979-03-27 Mosebach Manufacturing Company Resistance unit structure
FR2471721A1 (en) * 1979-12-11 1981-06-19 Seb Sa HEAT-RESISTANT HEAT-CUTTING ELEMENT FOR DOMESTIC ELECTRIC RADIATOR, MANUFACTURING METHOD AND RADIATOR THEREFOR
US4316172A (en) * 1980-06-25 1982-02-16 Eaton Corporation Resistor such as for dynamic braking of electric motors
US4477715A (en) * 1982-07-19 1984-10-16 Technar Incorporated PTC thermistor controlled electric diesel fuel heater

Also Published As

Publication number Publication date
JPS6059690A (en) 1985-04-06
DE3328078A1 (en) 1985-02-21
DE3328078C2 (en) 1989-02-16
US4553126A (en) 1985-11-12
EP0135704A1 (en) 1985-04-03
DE8322435U1 (en) 1985-05-30

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