EP0410146A2 - Sliding resistance - Google Patents

Sliding resistance Download PDF

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Publication number
EP0410146A2
EP0410146A2 EP90112044A EP90112044A EP0410146A2 EP 0410146 A2 EP0410146 A2 EP 0410146A2 EP 90112044 A EP90112044 A EP 90112044A EP 90112044 A EP90112044 A EP 90112044A EP 0410146 A2 EP0410146 A2 EP 0410146A2
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EP
European Patent Office
Prior art keywords
housing
resistance
housing cover
guide rails
carrier
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP90112044A
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German (de)
French (fr)
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EP0410146A3 (en
EP0410146B1 (en
Inventor
Rita Burger
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Wilhelm Ruf KG
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Wilhelm Ruf KG
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Filing date
Publication date
Application filed by Wilhelm Ruf KG filed Critical Wilhelm Ruf KG
Publication of EP0410146A2 publication Critical patent/EP0410146A2/en
Publication of EP0410146A3 publication Critical patent/EP0410146A3/en
Application granted granted Critical
Publication of EP0410146B1 publication Critical patent/EP0410146B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C1/00—Details
    • H01C1/02—Housing; Enclosing; Embedding; Filling the housing or enclosure
    • H01C1/022—Housing; Enclosing; Embedding; Filling the housing or enclosure the housing or enclosure being openable or separable from the resistive element
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01C—RESISTORS
    • H01C10/00—Adjustable resistors
    • H01C10/30—Adjustable resistors the contact sliding along resistive element
    • H01C10/38—Adjustable resistors the contact sliding along resistive element the contact moving along a straight path

Definitions

  • the innovation relates to a sliding resistor according to the preamble of claim 1.
  • sliding resistors are generally known and commercially available.
  • the electrical properties of the known sliding resistors such as linearity, limit values of the electrical resistance in the two end positions of the slide, freedom from hysteresis, etc. depend to a large extent on dimensional tolerances of the individual mechanical components of the sliding resistor.
  • An important influencing factor is the exact positioning of the resistance carrier in the housing.
  • it is known to rivet the resistance carrier in the housing, which is complex to manufacture and presupposes that the corresponding holes for the rivets both on the resistance carrier and are also exactly positioned on the housing.
  • the resistance carrier is only inserted into a frame of the housing from above. Due to the play required for this, the resistance carrier can still be moved slightly within the housing even after the final assembly, so that the electrical properties mentioned above are not obtained to the desired extent.
  • the main advantage is a significantly simplified assembly.
  • the resistance carrier and the wiper carrier with wiper spring are inserted into the housing from one end without, above all, the resistance carrier having to be positioned exactly.
  • the housing is then closed by the housing cover, which snaps into the housing with a snap lock. Due to the resilient web attached to the housing, the resistance carrier is also clearly positioned in the insertion direction and held there. Additional operations for positioning and / or fastening the resistance carrier in the housing are not required.
  • the precise execution of the assembly steps is irrelevant to the precision of the electrical properties of the sliding resistor.
  • the housing and the housing cover are each plastic injection molded parts, in particular the guide rails and the resilient web are each formed in one piece with the associated part. This results in a better dimensional accuracy of the mechanical parts, since primarily only the dimensional accuracy of the plastic injection mold is decisive. This also increases functional reliability, since no separate parts for guide rails and springs are required, which could otherwise lead to failures due to the way they are fastened.
  • One end of the housing can be closed by the housing cover, both the guide rails in the housing and the slot for guiding the wiper carrier to this side are open, so that these parts can be mounted from one side with an insertion direction.
  • the short guide rails on the housing cover keep the resistance carrier even more precisely in the housing.
  • the T-shaped snap hooks on the housing cover ensure that the housing cover is securely attached to the housing, so that it cannot come loose even when vibrated. Functional safety is promoted as a whole.
  • the chamfer on the guide rails simplifies assembly.
  • the sliding resistor has a housing 1 with a substantially cuboidal outer contour.
  • One end face of the housing 1 is open and can be closed by an essentially rectangular housing cover 2 will.
  • a rectangular resistance carrier 3 is arranged in the interior of the housing, on the upper side of which one or more resistance tracks 4 are applied.
  • the top of the housing 1 has an elongated hole-shaped opening 5, through which a grinder support 6 extends and is displaceably guided there.
  • a wiper spring 7 is fastened to the side of the wiper carrier facing the resistance carrier 3 and has a plurality of wiper arms 8 (cf. FIG. 3), each of which touches an associated resistance path 4.
  • the individual arms 8 are made of electrically conductive, resilient material and attached to a common strip 9, so that they are in electrical parallel with each other.
  • contact lugs 9 are attached, which are in electrical contact with the ends of the resistance tracks 4 or a conductor track 10.
  • the contact lugs 9 protrude through openings 11 in the end face 12 of the housing 1 facing away from the housing cover 2.
  • latching hooks projecting beyond the end face 12 are integrally attached to the housing 1. With this locking hook 13, the sliding resistance to another object, such as. B. a circuit board.
  • two mutually opposite guide rails 14 are present in the interior of the housing 1, which have guide grooves 15 directed towards one another and extend essentially through the entire length of the housing.
  • the resistance carrier is held in these guide rails 14 and can be inserted from the open end face of the housing 1.
  • bevels 16 are provided on the ends of the guide rails facing the open end of the housing 1.
  • the resistance carrier 3 is pushed in from the open end face of the housing 1 until the front side 17 lying in the insertion direction comes to a stop against stops 18 on the inside of the end wall 12.
  • the resistance carrier 3 is thus clearly and reproducibly fixed in the direction of insertion.
  • the two axes perpendicular to the direction of insertion are fixed by the guide rails 14.
  • a fixation against the direction of insertion is carried out by the housing cover 2, specifically by a resilient web 19 present there, which is made of the material of the housing cover 2 through two parallel incisions 20 and 21 is formed.
  • the resilient web 18 presses against the rear edge of the resistance support 3, as seen in the direction of insertion, and presses it permanently against the stops 18.
  • the guide rails 14 of the housing 1 are briefly aligned with the interior of the housing 1 protruding guide sections 22 are provided which fix the rear end of the resistance carrier in relation to the housing cover 2.
  • these guide sections also have chamfers 23.
  • the rear ends of the guide rails 14 also have chamfers 24 which facilitate insertion of the resistance carrier.
  • the housing cover 2 has integrally molded locking tongues 25 which are T-shaped in plan view.
  • the outer sides of the housing have corresponding T-shaped recesses, behind which the locking tongues snap into place.
  • the locking tongues each have a chamfer 27 for pushing on the housing cover.
  • the wiper carrier 6 has four sections which can be distinguished from one another, namely a first cuboid section 28 to which the wiper spring 7 is fastened.
  • the special type of this attachment is in DE-OS 36 29 002.5 of the applicant.
  • This first section 28 is wider than the slot-shaped opening 5 of the housing 1.
  • a second section 29 with a rectangular cross-section adjoining the first section 28 is arranged in the slot-shaped recess 5 and thus guides the wiper carrier 6 in the recess 5.
  • This is followed a third section 30, which is significantly wider than the slot-shaped recess 5 and has an approximately H-shaped contour in the plan view of FIG. 2.
  • the two lateral legs 31 and 32 formed in this way rest with dome-like projections 33 on a guide track 34 which is formed by the upper side of a housing wall 35, the slot-shaped opening 5 being excluded from this housing wall 35.
  • This housing wall 35 is offset inwards relative to an upper edge 36 of the housing 1, specifically by approximately the width of the third section 30. The upper side of the third section 30 is thus aligned with the upper edge 36 of the housing.
  • the third section 30 is followed by a fourth section 37 with a cylindrical shape, which serves as a gripping or actuating element for the sliding resistance.
  • the elongated hole-shaped opening 5 extends up to the end face of the housing, to which the housing cover 2 is attached. In the area of the other end face 12, however, the opening 5 ends at a stop formed by the housing wall 35.
  • the movement path of the grinder carrier is thus limited on the one hand by the stop 38 and on the other hand by the housing cover 2.
  • the housing 1, the housing cover 2 and the grinder support 6 are each plastic injection molded parts that can be easily mass-produced.
  • the assembly of the sliding resistor is particularly easy.
  • the cons Stand 3 is inserted into the open end of the housing 1 between the guideways 14.
  • the contact lugs 9 then pass through the opening 11 and the front edge of the resistance carrier 3 comes into contact with the stops 18.
  • the wiper carrier 6 is inserted into the slot-shaped opening 5.
  • the housing cover 2 is put on until the locking tongues 25 engage. All assembly steps are therefore carried out in the same direction from one end of the housing.
  • the individual parts are largely secured during assembly.
  • the assembly steps are also very simple. Nevertheless, the spatial design of the individual parts provides an exactly reproducible and extremely precise position of the parts relative to one another, which means that the electrical resistance values can be precisely maintained regardless of assembly tolerances or dimensional tolerances of the mechanical components.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Adjustable Resistors (AREA)

Abstract

The variable resistor has a housing (1) which can be closed at its one end by a housing cover (2). Arranged inside the housing (1) are two mutually opposite guide rails (14) between which a resistor support (3) is held. On the housing cover there is an elastically sprung web (19) which presses the resistor support elastically against the other end wall (12) of the housing. <IMAGE>

Description

Die Neuerung bezieht sich auf einen Schiebewiderstand gemäß dem Oberbegriff des Patentanspruches 1. Derartige Schiebewiderstände sind allgemein bekannt und im Handel erhältlich. Die elektrischen Eigenschaften der bekannten Schiebewiderstände, wie z.B. Linearität, Grenzwerte des elektrischen Widerstandes in den beiden Endstellungen des Schiebers, Hysteresefreiheit etc. hängen in starkem Maße von Maßtoleranzen der einzelnen mechanischen Komponenten des Schiebewiderstandes ab. Eine wichtige Einflußgröße ist dabei die exakte Positionierung des Widerstandsträ­gers im Gehäuse. Hierzu ist es bekannt, den Widerstands­träger im Gehäuse anzunieten, was aufwendig in der Her­stellung ist und voraussetzt, daß die entsprechenden Löcher für die Nieten sowohl am Widerstandsträger als auch am Gehäuse exakt positioniert sind. In anderen Fällen wird der Widerstandsträger lediglich von oben in einen Rahmen des Gehäuses eingelegt. Durch das hierzu erforderliche Spiel läßt sich der Widerstandsträger auch nach der Endmontage noch innerhalb des Gehäuses geringfü­gig verschieben, so daß die oben erwähnten elektrischen Eigenschaften nicht in dem wünschenswerten Ausmaß erhal­ten werden.The innovation relates to a sliding resistor according to the preamble of claim 1. Such sliding resistors are generally known and commercially available. The electrical properties of the known sliding resistors, such as linearity, limit values of the electrical resistance in the two end positions of the slide, freedom from hysteresis, etc. depend to a large extent on dimensional tolerances of the individual mechanical components of the sliding resistor. An important influencing factor is the exact positioning of the resistance carrier in the housing. For this purpose, it is known to rivet the resistance carrier in the housing, which is complex to manufacture and presupposes that the corresponding holes for the rivets both on the resistance carrier and are also exactly positioned on the housing. In other cases, the resistance carrier is only inserted into a frame of the housing from above. Due to the play required for this, the resistance carrier can still be moved slightly within the housing even after the final assembly, so that the electrical properties mentioned above are not obtained to the desired extent.

Aufgabe der vorliegenden Erfindung ist es daher, den eingangs genannten Schiebewiderstand dahingehend zu verbessern, daß er präzise reproduzierbare elektrische Eigenschaften aufweist, auch wenn seine einzelnen Kompo­nenten stärker streuende Toleranzen in den Abmessungen haben.It is therefore an object of the present invention to improve the sliding resistance mentioned at the outset in such a way that it has precisely reproducible electrical properties, even if its individual components have tolerances in the dimensions which are more scattering.

Diese Aufgabe wird durch die im Patentanspruch angegebe­nen Merkmale gelöst. Vorteilhafte Ausgestaltungen und Weiterbildungen der Neuerung sind den Unteransprüchen zu entnehmen.This object is achieved by the features specified in the patent claim. Advantageous refinements and developments of the innovation can be found in the subclaims.

Als wesentlichen Vorteil erhält man neben der Lösung der obigen Aufgabenstellung auch noch eine deutlich verein­fachte Montage. Der Widerstandsträger und der Schleifer­träger mit Schleiferfeder werden von einer Stirnseite in das Gehäuse eingeschoben, ohne daß vor allem der Wider­standsträger exakt positioniert werden muß. Sodann wird das Gehäuse durch den Gehäusedeckels der mit einem Schnappverschluß in das Gehäuse einrastet, verschlossen. Durch den am Gehäuse angebrachten federnden Steg wird der Widerstandsträger auch in Einschieberichtung eindeutig positioniert und dort gehalten. Zusätzliche Arbeitsgänge zum Positionieren und/oder Befestigen des Widerstandsträ­gers im Gehäuse sind nicht erforderlich. Für die Präzisi­on der elektrischen Eigenschaften des Schiebewiderstandes ist dabei die präzise Ausführung der Montageschritte ohne Belang. Für den Anfangs-Widerstandswert, bei dem der Federträger in einer Grenzlage ist, sind lediglich Maßto­ leranzen eines Anschlages an einer Stirnseite des Gehäu­ses und die relative Lage der Widerstandsbahnen in Bezug auf eine Stirnseite des Widerstandsträgers maßgeblich. Alle übrigen Maße der Baugruppen können innerhalb relativ weiter Toleranzen variieren, ohne daß die elektrischen Eigenschaften des Schiebewiderstandes hierdurch verändert werden.In addition to solving the above task, the main advantage is a significantly simplified assembly. The resistance carrier and the wiper carrier with wiper spring are inserted into the housing from one end without, above all, the resistance carrier having to be positioned exactly. The housing is then closed by the housing cover, which snaps into the housing with a snap lock. Due to the resilient web attached to the housing, the resistance carrier is also clearly positioned in the insertion direction and held there. Additional operations for positioning and / or fastening the resistance carrier in the housing are not required. The precise execution of the assembly steps is irrelevant to the precision of the electrical properties of the sliding resistor. For the initial resistance value at which the spring support is in a limit position, only measurements are required leranzen a stop on an end face of the housing and the relative position of the resistance tracks with respect to an end face of the resistance carrier is decisive. All other dimensions of the assemblies can vary within relatively wide tolerances without changing the electrical properties of the sliding resistance.

Das Gehäuse und der Gehäusedeckel sind jeweils Kunst­stoff-Spritzgußteile, wobei insbesondere die Führungs­schienen und der elastisch federnde Steg jeweils einstük­kig mit dem zugehörigen Teil ausgebildet sind. Hierdurch erhält man eine bessere Maßgenauigkeit der mechanischen Teile, da primär dann nur noch die Maßgenauigkeit der Kunststoff-Spritzgußform ausschlaggebend ist. Auch wird hierdurch die Funktionssicherheit erhöht, da keine sepa­raten Teile für Führungsschienen und Feder benötigt werden, die durch die Art ihrer Befestigung ansonsten zu Ausfällen führen könnten.The housing and the housing cover are each plastic injection molded parts, in particular the guide rails and the resilient web are each formed in one piece with the associated part. This results in a better dimensional accuracy of the mechanical parts, since primarily only the dimensional accuracy of the plastic injection mold is decisive. This also increases functional reliability, since no separate parts for guide rails and springs are required, which could otherwise lead to failures due to the way they are fastened.

Die eine Stirnseite des Gehäuses ist durch den Gehäuse­deckel verschließbar, wobei sowohl die Führungsschienen im Gehäuse als auch das Langloch für die Führung des Schleiferträgers zu dieser Seite hin offen sind, so daß diese Teile von einer Seite her mit einer Einschubrich­tung montiert werden können.One end of the housing can be closed by the housing cover, both the guide rails in the housing and the slot for guiding the wiper carrier to this side are open, so that these parts can be mounted from one side with an insertion direction.

Durch die am Gehäusedeckel vorhandenen kurzen Führungs­schienen wird der Widerstandsträger noch präziser im Gehäuse gehalten.The short guide rails on the housing cover keep the resistance carrier even more precisely in the housing.

Durch die T-förmigen Schnapphaken am Gehäusedeckel wird eine sichere Befestigung des Gehäusedeckels am Gehäuse erhalten, so daß sich diese auch bei Vibrationen nicht lösen kann. Dadurch wird insgesamt die Funktionssicher­heit gefördert. Durch die Öffnungen in der Stirnseite des Gehäuses, durch welche die mit dem Widerstandsträger verbundenen Lötfahnen hindurchragen, erhält man eine weitere Vereinfachung des Schiebewiderstandes und damit eine Erhöhung der Funktionssicherheit und letztlich auch eine vereinfachte Montage, da die ansonsten üblichen, fest im Gehäuse eingegossenen Lötfahnen nicht mehr durch zusätzliche elektrische Leiter mit dem Widerstandsträger verbunden werden müssen, was durch schlechte Lötstellen oder Bruch von Lötstellen bei Vibrationen sonst zu Aus­fällen führt.The T-shaped snap hooks on the housing cover ensure that the housing cover is securely attached to the housing, so that it cannot come loose even when vibrated. Functional safety is promoted as a whole. One obtains one through the openings in the end face of the housing, through which the soldering lugs connected to the resistance carrier protrude Further simplification of the sliding resistance and thus an increase in functional reliability and ultimately also a simplified assembly, since the otherwise customary, permanently cast solder tabs no longer have to be connected to the resistance carrier by additional electrical conductors, which is caused by poor solder joints or broken solder joints in the event of vibrations otherwise leads to failures.

Dadurch, daß die Führungsbahn für den Schleiferträger gegenüber der Oberkante des Gehäuses nach innen versetzt ist, werden zusätzliche, quer zur Verschieberichtung verlaufende Führungen für den Widerstandsträger gebildet, wodurch ein Verkanten des Federträgers vermieden wird, was letztendlich wiederum der Verbesserung der elektri­schen Eigenschaften zugute kommt.Characterized in that the guide track for the grinder carrier is offset inwards with respect to the upper edge of the housing, additional guides for the resistance carrier extending transversely to the direction of displacement are formed, thereby preventing the spring carrier from tilting, which in turn ultimately benefits the improvement in the electrical properties.

Durch die Fasen an den Führungsschienen wird die Montage vereinfacht.The chamfer on the guide rails simplifies assembly.

Im folgenden wird die Neuerung anhand eines Ausführungs­beispieles im Zusammenhang mit der Zeichnung ausführli­cher erläutert. Es zeigt:

  • Fig. 1 eine teilweise geschnittene Seitenansicht des Schiebewiderstandes;
  • Fig. 2 eine teilweise geschnittene Draufsicht des Schiebewiderstandes; und
  • Fig. 3 eine Ansicht der Stirnseite des Schiebewider­standes bei geöffnetem Gehäusedeckel.
The innovation is explained in more detail below using an exemplary embodiment in conjunction with the drawing. It shows:
  • Figure 1 is a partially sectioned side view of the sliding resistor.
  • Figure 2 is a partially sectioned top view of the sliding resistor. and
  • Fig. 3 is a view of the end face of the sliding resistor with the housing cover open.

Gleiche Bezugzeichen in den einzelnen Figuren bezeichnen gleiche Teile.The same reference symbols in the individual figures denote the same parts.

Der Schiebewiderstand besitzt ein Gehäuse 1 mit im we­sentlichen quaderförmiger Außenkontur. Eine Stirnseite des Gehäuses 1 ist offen und kann durch einen im wesent­lichen rechteckförmigen Gehäusedeckel 2 verschlossen werden. Im Inneren des Gehäuses ist eine rechteckförmiger Widerstandsträger 3 angeordnet, auf dessen Oberseite eine oder mehrere Widerstandsbahnen 4 aufgebracht sind. Die Oberseite des Gehäuses 1 weist eine langlochförmige Öffnung 5 auf, durch die ein Schleiferträger 6 hindurch­greift und dort verschieblich geführt ist. An der dem Widerstandsträger 3 zugewandten Seite des Schleiferträ­gers ist eine Schleiferfeder 7 befestigt, die mehrere Schleiferarme 8 aufweist (vgl. Fig. 3), die jeweils eine zugeordnete Widerstandsbahn 4 berühren. Die einzelnen Arme 8 sind aus elektrisch leitfähigem, federndem Materi­al und an einem gemeinsamen Streifen 9 befestigt, so daß sie in elektrischer Parallelschaltung zueinander liegen.The sliding resistor has a housing 1 with a substantially cuboidal outer contour. One end face of the housing 1 is open and can be closed by an essentially rectangular housing cover 2 will. A rectangular resistance carrier 3 is arranged in the interior of the housing, on the upper side of which one or more resistance tracks 4 are applied. The top of the housing 1 has an elongated hole-shaped opening 5, through which a grinder support 6 extends and is displaceably guided there. A wiper spring 7 is fastened to the side of the wiper carrier facing the resistance carrier 3 and has a plurality of wiper arms 8 (cf. FIG. 3), each of which touches an associated resistance path 4. The individual arms 8 are made of electrically conductive, resilient material and attached to a common strip 9, so that they are in electrical parallel with each other.

An der dem Gehäusedeckel 2 abgewandten Seite des Wider­standsträgers 3 sind Kontaktfahnen 9 angebracht, die in elektrischem Kontakt mit den Enden der Widerstandsbahnen 4 bzw. einer Leiterbahn 10 stehen. Die Kontaktfahnen 9 ragen durch Öffnungen 11 in der dem Gehäusedeckel 2 abgewandten Stirnseite 12 des Gehäuses 1 hindurch.On the side of the resistance carrier 3 facing away from the housing cover 2, contact lugs 9 are attached, which are in electrical contact with the ends of the resistance tracks 4 or a conductor track 10. The contact lugs 9 protrude through openings 11 in the end face 12 of the housing 1 facing away from the housing cover 2.

An den beiden zur Stirnseite 12 benachbarten Seitenwänden des Gehäuses 1 sind über die Stirnseite 12 hinausragende Rasthaken einstückig an dem Gehäuse 1 angebracht. Mit diesen Rasthaken 13 kann der Schiebewiderstand an einem anderen Gegenstand, wie z. B. einer Leiterplatte, befe­stigt werden.On the two side walls of the housing 1 adjacent to the end face 12, latching hooks projecting beyond the end face 12 are integrally attached to the housing 1. With this locking hook 13, the sliding resistance to another object, such as. B. a circuit board.

Wie am besten aus Fig. 3 zu erkennen ist, sind im Inneren des Gehäuses 1 zwei einander gegenüberliegende Führungs­schienen 14 vorhanden, die aufeinanderzu gerichtete Führungsnuten 15 aufweisen und sich im wesentlichen durch die gesamte Länge des Gehäuses erstrecken. In diesen Führungsschienen 14 ist der Widerstandsträger gehalten und kann von der offenen Stirnseite des Gehäuses 1 her eingeschoben werden. Um dieses Einschieben zu erleich­tern, sind an den zur offenen Stirnseite des Gehäuses 1 weisenden Enden der Führungsschienen Fasen 16 vorgesehen.As can best be seen from FIG. 3, two mutually opposite guide rails 14 are present in the interior of the housing 1, which have guide grooves 15 directed towards one another and extend essentially through the entire length of the housing. The resistance carrier is held in these guide rails 14 and can be inserted from the open end face of the housing 1. In order to facilitate this insertion, bevels 16 are provided on the ends of the guide rails facing the open end of the housing 1.

Bei der Montage wird der Widerstandsträger 3 von der offenen Stirnseite des Gehäuses 1 her eingeschoben, bis die in Einschieberichtung liegende Vorderseite 17 gegen Anschläge 18 an der Innenseite der Stirnwand 12 zum Anschlag kommt. Damit ist der Widerstandsträger 3 in Einschieberichtung eindeutig und reproduzierbar fixiert. Die Fixierung der beiden senkrecht zur Einschieberichtung liegenden Achsen erfolgt durch die Führungsschienen 14. Eine Fixierung entgegen der Einschieberichtung erfolgt durch den Gehäusedeckel 2 und zwar konkret durch einen dort vorhandenen federnden Steg 19, der aus dem Material des Gehäusedeckels 2 durch zwei parallele Einschnitte 20 und 21 gebildet ist. In montiertem Zustand drückt der federnde Steg 18 gegen die in Einschieberichtung gesehen hintere Kante des Widerstandsträgers 3 und drückt diesen permanent gegen die Anschläge 18. In beiden seitlichen Bereichen des Gehäusedeckels 2 sind fluchtend mit den Führungsschienen 14 des Gehäuses 1 kurze in das Innere des Gehäuses 1 hineinragende Führungsabschnitte 22 vorge­sehen, die das hintere Ende des Widerstandsträgers gegen­über dem Gehäusedeckel 2 fixieren. Zum leichteren Aufset­zen des Deckels besitzen auch diese Führungsabschnitte Fasen 23. In ähnlicher Weise haben auch die hinteren Enden der Führungsschienen 14 Fasen 24, die ein Einschie­ben des Widerstandsträgers erleichtern.During assembly, the resistance carrier 3 is pushed in from the open end face of the housing 1 until the front side 17 lying in the insertion direction comes to a stop against stops 18 on the inside of the end wall 12. The resistance carrier 3 is thus clearly and reproducibly fixed in the direction of insertion. The two axes perpendicular to the direction of insertion are fixed by the guide rails 14. A fixation against the direction of insertion is carried out by the housing cover 2, specifically by a resilient web 19 present there, which is made of the material of the housing cover 2 through two parallel incisions 20 and 21 is formed. In the assembled state, the resilient web 18 presses against the rear edge of the resistance support 3, as seen in the direction of insertion, and presses it permanently against the stops 18. In both lateral areas of the housing cover 2, the guide rails 14 of the housing 1 are briefly aligned with the interior of the housing 1 protruding guide sections 22 are provided which fix the rear end of the resistance carrier in relation to the housing cover 2. To make it easier to put on the cover, these guide sections also have chamfers 23. Similarly, the rear ends of the guide rails 14 also have chamfers 24 which facilitate insertion of the resistance carrier.

Der Gehäusedeckel 2 besitzt einstückig an ihm angeformte Verriegelungszungen 25, die in der Draufsicht T-förmig sind. Die äußeren Seiten des Gehäuses besitzen entspre­chende T-förmige Ausnehmungen, hinter die die Verriege­lungszungen einrasten. Zum Aufschieben des Gehäusedeckels besitzen auch die Verriegelungszungen je eine Fase 27.The housing cover 2 has integrally molded locking tongues 25 which are T-shaped in plan view. The outer sides of the housing have corresponding T-shaped recesses, behind which the locking tongues snap into place. The locking tongues each have a chamfer 27 for pushing on the housing cover.

Der Schleiferträger 6 hat vier voneinander unterscheidba­re Abschnitte, nämlich einen ersten quaderförmigen Ab­schnitt 28, an dem die Schleiferfeder 7 befestigt ist. Die spezielle Art dieser Befestigung ist in der DE-OS 36 29 002.5 der Anmelderin beschrieben. Dieser erste Abschnitt 28 ist breiter als die langlochförmige Öffnung 5 des Gehäuses 1. Ein sich an den ersten Abschnitt 28 anschließender zweiter Abschnitt 29 mit rechteckigem Querschnitt ist in der langlochförmigen Ausnehmung 5 angeordnet und führt damit den Schleiferträger 6 in der Ausnehmung 5. Daran schließt sich ein dritter Abschnitt 30 an, der deutlich breiter als die langlochförmige Ausnehmung 5 ist und in der Draufsicht der Fig. 2 in etwa eine H-förmige Kontur hat. Die beiden hierdurch gebilde­ten seitlichen Schenkel 31 und 32 liegen mit kalottenar­tigen Vorsprüngen 33 auf einer Führungsbahn 34 auf, die durch die Oberseite einer Gehäusewand 35 gebildet ist, wobei die langlochförmige Öffnung 5 aus dieser Gehäuse­wand 35 ausgenommen ist. Diese Gehäusewand 35 ist gegen­über einer Oberkante 36 des Gehäuses 1 nach innen verset­ze und zwar in etwa um die Breite des dritten Abschnittes 30. Somit fluchtet die Oberseite des dritten Abschnittes 30 mit der Oberkante 36 des Gehäuses.The wiper carrier 6 has four sections which can be distinguished from one another, namely a first cuboid section 28 to which the wiper spring 7 is fastened. The special type of this attachment is in DE-OS 36 29 002.5 of the applicant. This first section 28 is wider than the slot-shaped opening 5 of the housing 1. A second section 29 with a rectangular cross-section adjoining the first section 28 is arranged in the slot-shaped recess 5 and thus guides the wiper carrier 6 in the recess 5. This is followed a third section 30, which is significantly wider than the slot-shaped recess 5 and has an approximately H-shaped contour in the plan view of FIG. 2. The two lateral legs 31 and 32 formed in this way rest with dome-like projections 33 on a guide track 34 which is formed by the upper side of a housing wall 35, the slot-shaped opening 5 being excluded from this housing wall 35. This housing wall 35 is offset inwards relative to an upper edge 36 of the housing 1, specifically by approximately the width of the third section 30. The upper side of the third section 30 is thus aligned with the upper edge 36 of the housing.

An den dritten Abschnitt 30 schließt sich ein vierter Abschnitt 37 mit zylinderförmiger Gestalt an, der als Greif- bzw. Betätigungsorgan für den Schiebewiderstand dient.The third section 30 is followed by a fourth section 37 with a cylindrical shape, which serves as a gripping or actuating element for the sliding resistance.

Wie am besten aus Fig. 1 zu erkennen ist, erstreckt sich die langlochförmige Öffnung 5 bis zu der Stirnseite des Gehäuses hin, an welcher der Gehäusedeckel 2 angebracht ist. Im Bereich der anderen Stirnseite 12 endet die Öffnung 5 dagegen an einem durch die Gehäusewand 35 gebildeten Anschlag. Damit ist der Bewegungsweg des Schleiferträgers einerseits durch den Anschlag 38 und andererseits durch den Gehäusedeckel 2 begrenzt.As can best be seen from FIG. 1, the elongated hole-shaped opening 5 extends up to the end face of the housing, to which the housing cover 2 is attached. In the area of the other end face 12, however, the opening 5 ends at a stop formed by the housing wall 35. The movement path of the grinder carrier is thus limited on the one hand by the stop 38 and on the other hand by the housing cover 2.

Das Gehäuse 1, der Gehäusedeckel 2 und der Schleiferträ­ger 6 sind jeweils Kunststoff-Spritzgußteile, die einfach in Massenproduktion herstellbar sind. Die Montage des Schiebewiderstandes ist besonders einfach. Der Wider­ standsträger 3 wird in die offene Stirnseite des Gehäuses 1 zwischen die Führungsbahnen 14 eingeschoben. Die Kon­taktfahnen 9 durchtreten dann die Öffnung 11 und die Vorderkante des Widerstandsträgers 3 kommt in Berührung mit den Anschlägen 18. Sodann wird der Schleiferträger 6 in die langlochförmige Öffnung 5 eingeführt. Schließlich wird der Gehäusedeckel 2 aufgesetzt, bis die Verriege­lungszungen 25 einrasten. Alle Montageschritte erfolgen daher von einer Stirnseite des Gehäuses her in derselben Richtung. Schon während der Montage sind die Einzelteile dabei weitestgehend gesichert. Auch sind die Montage­schritte sehr einfach. Gleichwohl erhält man durch die räumliche Gestaltung der einzelnen Teile eine exakt reproduzierbare und äußerst präzise relative Lage der Teile zueinander, womit auch die elektrischen Wider­standswerte unabhängig von Montagetoleranzen bzw. Maßto­leranzen der mechanischen Komponenten präzise eingehalten werden können.The housing 1, the housing cover 2 and the grinder support 6 are each plastic injection molded parts that can be easily mass-produced. The assembly of the sliding resistor is particularly easy. The cons Stand 3 is inserted into the open end of the housing 1 between the guideways 14. The contact lugs 9 then pass through the opening 11 and the front edge of the resistance carrier 3 comes into contact with the stops 18. Then the wiper carrier 6 is inserted into the slot-shaped opening 5. Finally, the housing cover 2 is put on until the locking tongues 25 engage. All assembly steps are therefore carried out in the same direction from one end of the housing. The individual parts are largely secured during assembly. The assembly steps are also very simple. Nevertheless, the spatial design of the individual parts provides an exactly reproducible and extremely precise position of the parts relative to one another, which means that the electrical resistance values can be precisely maintained regardless of assembly tolerances or dimensional tolerances of the mechanical components.

Sämtliche in den Patentansprüchen, der Beschreibung und der Zeichnung dargestellten Merkmale können sowohl für sich als auch in beliebiger Kombination miteinander wesentlich für die Neuerung sein.All of the features shown in the claims, the description and the drawing can be essential for the innovation both individually and in any combination with one another.

Claims (10)

1. Schiebewiderstand mit einem Gehäuse, einem im Gehäuse angeordneten Widerstandsträger mit minde­stens einer auf seiner Oberseite aufgebrachten Widerstandsbahn, einem in einem Langloch des Gehäuses verschieblich angeordneten Schleiferträger und mit einer am Schleiferträger befestigten Schleiferfeder, die in Berührung mit der Wider­standsbahn ist,
dadurch gekennzeichnet,
daß im Inneren des Gehäuses (1) zwei einander gegenüberliegende Führungsschienen (14) angeordnet sind, zwischen denen der Widerstandsträger (3) gehalten ist, daß die Führungsschienen (14) zu einer Stirnseite des Gehäuses (1) hin offen sind,
daß ein Gehäusedeckel (2) an dieser Stirnseite des Gehäuses (1) vorhanden ist und
daß ein elastisch federnder Steg (19) des Gehäuse­deckels (2) mit der Stirnseite des Widerstandsträ­gers (3) in Berührung ist.1.Sliding resistor with a housing, a resistance carrier arranged in the housing with at least one resistance track applied on its upper side, a slider carrier arranged displaceably in an elongated hole of the housing and with a slider spring attached to the slider carrier, which is in contact with the resistance path,
characterized,
that two mutually opposite guide rails (14) are arranged in the interior of the housing (1), between which the resistance carrier (3) is held, that the guide rails (14) are open towards one end of the housing (1),
that a housing cover (2) is provided on this end face of the housing (1) and
that an elastically resilient web (19) of the housing cover (2) is in contact with the end face of the resistance carrier (3). 2. Schiebewiderstand nach Anspruch 1, dadurch gekenn­zeichnet, daß an der dem Gehäusedeckel (2) gegen­überliegenden Stirnseite (12) des Gehäuses (1) mindestens ein Anschlag (18) vorhanden ist, der mit der anderen Stirnseite (17) des Widerstandsträgers (3) in Berührung ist.2. Sliding resistor according to claim 1, characterized in that on the housing cover (2) opposite end face (12) of the housing (1) there is at least one stop (18) which with the other end face (17) of the resistance carrier (3) is in contact. 3. Schiebewiderstand nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der elastisch federnde Steg (19) einstückig mit dem Gehäusedeckel (2) verbunden ist, dadurch, daß zwei parallel zueinander verlau­fende Einschnitte (20 ) im Gehäusedeckel (2) vorhanden sind.3. Sliding resistance according to claim 1 or 2, characterized in that the resilient web (19) is integrally connected to the housing cover (2), characterized in that two parallel incisions (20) are present in the housing cover (2). 4. Schiebewiderstand nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß das Langloch (5) in Richtung zu der Stirnseite des Gehäuses (1), an der der Gehäusedeckel (2) vorhanden ist, offen ist und daß der Gehäusedeckel (2) unmittelbar angrenzend an diese Öffnung des Langloches angeordnet ist.4. sliding resistor according to one of claims 1 to 3, characterized in that the elongated hole (5) towards the end of the housing (1) on which the housing cover (2) is present is open and that the housing cover (2) is arranged immediately adjacent to this opening of the elongated hole. 5. Schiebewiderstand nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß auch am Gehäusedeckel (2) Führungsschienen (22) vorhanden sind, die entsprechend den Führungsschienen (14) des Gehäuses (1) angeordnet und fluchtend mit diesen ausgerichtet sind und daß die Führungsschienen (22) des Gehäuse­deckels (2) in das Innere des Gehäuses (1) hineinra­gen.5. Sliding resistor according to one of claims 1 to 4, characterized in that also on the housing cover (2) guide rails (22) are present, which are arranged corresponding to the guide rails (14) of the housing (1) and aligned with them and that Project the guide rails (22) of the housing cover (2) into the interior of the housing (1). 6. Schiebewiderstand nach einem der Ansprüche 1 bis 5, dadurch gekennzeichnet, daß am Gehäusedeckel (2) zwei T-förmige Rasthaken (25) vorhanden sind, die in entsprechende Ausnehmungen (26) an der Ausßensei­te des Gehäuses (1) eingreifen.6. Sliding resistor according to one of claims 1 to 5, characterized in that two T-shaped latching hooks (25) are provided on the housing cover (2), which engage in corresponding recesses (26) on the outer side of the housing (1). 7. Schiebewiderstand nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, daß an der dem Gehäusedeckel gegenüberliegenden Stirnseite (12) des Gehäuses (1) Öffnungen (11) vorhanden sind, durch welche mit den Widerstandsbahnen verbundene Lötfahnen (9) hindurch­treten.7. Sliding resistor according to one of claims 1 to 6, characterized in that on the opposite end of the housing cover (12) of the housing (1) there are openings (11) through which solder lugs (9) connected to the resistance paths pass. 8. Schiebewiderstand nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß die Führungsschienen (14) einstückig mit dem Gehäuse (1) verbunden sind und daß das Gehäuse aus Kunststoff ist.8. sliding resistance according to one of claims 1 to 7, characterized in that the guide rails (14) are integrally connected to the housing (1) and that the housing is made of plastic. 9. Schiebewiderstand nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß diejenige Wand (35) des Gehäuses (1), in der das Langloch (5) vorhanden ist, gegenüber der Oberseite (36) des Gehäuses (1) nach innen versetzt angeordnet ist.9. sliding resistor according to one of claims 1 to 8, characterized in that that wall (35) of the housing (1), in which the elongated hole (5) is present, offset inwards relative to the top (36) of the housing (1) is arranged. 10. Schiebewiderstand nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß an den offenen Enden der Führungsschienen (14, 21) Fasen (24, 23) vorhanden sind.10. sliding resistance according to one of claims 1 to 9, characterized in that chamfers (24, 23) are present at the open ends of the guide rails (14, 21).
EP90112044A 1989-07-24 1990-06-25 Sliding resistance Expired - Lifetime EP0410146B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE8908984U DE8908984U1 (en) 1989-07-24 1989-07-24
DE8908984U 1989-07-24

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EP0410146A2 true EP0410146A2 (en) 1991-01-30
EP0410146A3 EP0410146A3 (en) 1992-04-29
EP0410146B1 EP0410146B1 (en) 1995-01-25

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ID=6841379

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90112044A Expired - Lifetime EP0410146B1 (en) 1989-07-24 1990-06-25 Sliding resistance

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EP (1) EP0410146B1 (en)
DE (2) DE8908984U1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6005473A (en) * 1995-01-20 1999-12-21 Alps Electric Co., Ltd. Rotary operation type variable resistor
GB2370696A (en) * 1999-04-01 2002-07-03 Penny & Giles Controls Ltd Linear potentiometer
CN108711478A (en) * 2018-05-20 2018-10-26 苏州固特斯电子科技有限公司 A kind of regulating device of adjustable resistance

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006045500A1 (en) * 2006-09-27 2008-04-17 Hella Kgaa Hueck & Co. Actuating drive's adjustable stroke sensing potentiometer for adjusting forward lighting of motor vehicle headlight, has grinder that is connected with slider and sliding over resistive sliding web during displacement of slider

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2310136A1 (en) * 1973-03-01 1974-09-05 Ruf Ohg Wilhelm SLIDE RESISTANCE
DE2516874A1 (en) * 1975-04-17 1976-10-28 Licentia Gmbh Sliding potentiometer with inaccessible live components - has housing separated into upper and lower chamber with centrally mounted slider
US4005381A (en) * 1975-06-09 1977-01-25 Dale Electronics, Inc. Slide potentiometer

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2310136A1 (en) * 1973-03-01 1974-09-05 Ruf Ohg Wilhelm SLIDE RESISTANCE
DE2516874A1 (en) * 1975-04-17 1976-10-28 Licentia Gmbh Sliding potentiometer with inaccessible live components - has housing separated into upper and lower chamber with centrally mounted slider
US4005381A (en) * 1975-06-09 1977-01-25 Dale Electronics, Inc. Slide potentiometer

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6005473A (en) * 1995-01-20 1999-12-21 Alps Electric Co., Ltd. Rotary operation type variable resistor
GB2370696A (en) * 1999-04-01 2002-07-03 Penny & Giles Controls Ltd Linear potentiometer
GB2370696B (en) * 1999-04-01 2002-12-18 Penny & Giles Controls Ltd Potentiometer
CN108711478A (en) * 2018-05-20 2018-10-26 苏州固特斯电子科技有限公司 A kind of regulating device of adjustable resistance

Also Published As

Publication number Publication date
EP0410146A3 (en) 1992-04-29
DE59008338D1 (en) 1995-03-09
DE8908984U1 (en) 1989-09-14
EP0410146B1 (en) 1995-01-25

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