DE2004807A1 - Rotary potentiometer or rotary resistance - Google Patents

Description

The invention relates to a rotary potentiometer or a Rotary resistor, consisting of a resistance element with a sheet or wire resistor and one of the latter on a circular arc-shaped movement path with springy Contact pressure tapping wiper contact in a housing «which is equipped with a rotary bearing for a drive shaft of the wiper contact and on the outside with the latter and the connection contacts assigned to the resistance element *

The enclosures are currently being used by the industry in large numbers manufactured rotary potentiometer or rotary resistor

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each from one of the drive shafts of the sliding contacts xug ordered end shield and one made of thin-walled sheet metal, for example aluminum sheet, cylindrically deep-drawn housing cap, which laps the free front edge ■ it can be connected to the end shield. Making the cloths for the lap connection on the free front edge of the housing cap

* ejf not only orders complicated punching tools · but conditionally also a considerable waste of material, so that the manufacturing costs of the rotary potentiometer prepare for these reasons bsw. Drehwideretande increased in an uneconomical manner will. The resistance elements of the known rotary potentiometers or rotary resistance, which are provided with rail resistors, exist each from one with the end shield of the drive shaft through • in with this coaxial hollow rivet or duroh an adhesive ver bonded plastic washer on which the connection contacts of the Stands susdndest protruding approximately radially in the area of the ends

w duroh each a rivet are attached, which at the same time creates the conductive connection with the associated resistance ends. On disk-shaped resistance elements, within the arc-shaped resistance layer, there is a bing base surface that is coaxial with the drive shaft of the base contact and with spring contact through it, for example

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also by lapping, attached and with a assigned Ltftfahno conductively connected, which is riveted to the Wider-Btandoelentnt. Attaching the Bingechleifbahn as well as riveting the terminals on the resistor element as well as its attachment to the end shield also requires complicated devices and additional work, reducing the manufacturing costs of the known Rotary potentiometer or rotary resistors continue to be increased. These are also in spite of the high Gesssitkoaten for the production due to the connection contacts protruding from the housing relatively prone to failure, since the latter echon with minor Impact or Druokoin effects during the transport or the Assembly pivoted around the fastening rivet assigned to it can be, which very often the conductive connections to the resistance or to the dragging path are either completely interrupted or are afflicted with loose contacts.

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The same also applies to the turning potentiometers currently manufactured by industry »? with wirewound resistors connected to ' Hü ^ n- or ring-shaped resistance carriers are arranged. The latter are each fastened during time-consuming and complex operations in the associated housing by means of nut screws that penetrate radially outwardly, the same-

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«Titig also form the connection terminals for the wire resistor and at least when the wires are conductively connected. At the Tightening the nuts during the interconnection of the rotary potentiometer or rotary resistor, the fastening screws are dee Wideretandeelementa e very often turned and thereby the conductive connections with the resistor ends interrupted. The currently known rotary potentiometers with wire resistors are therefore also associated with uneconomically high production costs and a considerable susceptibility to failure.

The invention is based on the object of a rotary potentioaeter of the type mentioned at the beginning »suggests such constructive construction with little effort that it has hitherto been more economical in large To produce quantities and eats less prone to failure. this will achieved by the fact that the Winarstandseleraent in the manner of a slotted sleeve, disc or ring-shaped coil spring Radially elastically bendable and like one due to elastic Durohmosseräade ^ ungen in the housing in the pressure direction of the wiper contact as well as non-rotatable by this is determinable.

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Because of these simple construction measures is already an economic reduction in manufacturing costs for the Rotary potentiometer or rotary resistance guaranteed, since the Resistance element without the need for screwing, riveting or gluing like a coil spring only in the Housing is clamped and still against moving and twisting is secured by the wiper contact.

In this context, however, it is advantageous if the resistance element with to the movement path of the wiper contact spaced sleeve, disc or ring areas into one associated annular groove-shaped recess of at least one abutment arranged in the interior of the housing, can be latched. This is a Locking seat of the resistance element that is secure against sliding in both axial directions guaranteed within the housing.

It is also provided that the terminal contacts assigned Areas of the housing and possibly also the abutment of the resistance element made of electrically insulating Material are made, and that each terminal contact is made of one from the inside of the housing through an associated slot in the insulating material, which can optionally be knocked out

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la CHeitsit "hlndurohsohiebbaren solder tail bestallt that ait a bending of the inner end flags against the inside and old the free end of a herauefedernden from <Ler flag level and push firmly into these pressed s catch tongue against the outside of the case is abetützbar. This structural design from the housing and the connection contacts enables economic acceleration and facilitation of the assembly

r of the rotary potentiometer or rotary resistance, since the socket-contact contacts only need to be pushed from the inside of the housing through its insulating wall areas until the catches snap into place. In this hasty position, the connection contacts are not only anchored to the housing in a sliding manner but also pivoting and rotating, so that the durability of the electrically conductive connections, for example soldered connections, between the resistor and its connection contacts is not endangered even if they are on them

1) during transport and the interconnection of more or less severe impact or pressure forces acting "That Erehpotentioaeter are also significantly reliable · ¹ than before.

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Palls the latter one to the drive axis of the wiper contact coaxial and through these springs contacted ring grinding surface in electrically conductive connection with one of the connection contacts it is useful if the induction grinding surface directly at the angled end of the slide contact assigned Solder lug conductively attached, for example in a punctiform manner welded, is. As a result, the assembly costs are reduced with a simultaneous, additional increase in operational reliability furthermore, reduced in an economical manner, as the induction grinding surface without the need for lapping or other fastening elements is fixed in the housing simultaneously with the assembly of the associated soldering lug, with their welding ensures an electrically conductive connection with the latter, also due to · impact and pressure on the soldering lug cannot be affected.

A preferred embodiment of the rotary potentiometer or Rotational resistance, like one of the initially described known type forming an end wall of the housing and the pivot bearing of the drive shaft of the wiper contact Bearing shield on. This design is a simple construction of the housing ensures that the soldering lugs

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penetrated uehäuabereiche duroli a Kappanbodon , gegtbenenfitlls in its vicinity integrally formed with the abutment of the resistance element, cylindrically made of plastic, oehmuet cap, which is lined at the free end edge by the bearing shield and forms the housing with this. A housing cap of this kind is, if necessary, ainetUokig with the abutment of the T / iderstanaskörpers, we technically in large pieces & n duroh injection molding or fretting and, in particular with the use of thermoplastic plastics, without the need for a Lappsn connection by heat deformation with the bearing shield.

In this ZucßSL & enhsng lot qr especially good, vietm the free forehead edge of the haircap in eiao ca des? The neighboring laying shield area eiiiigespai'ts CdG ^ auseproSts Hingnut can be cut and in this through the ri.ng- or absiüncilieh punctiform binding of the outer f \ ^: ut7rauduBg: in dcu vjßßohlosaaiien outer capoptmantle is feotset. Bieazi's impressions can be done quickly in the simplest of works, because the assembly of the OehKusdo requires a negligible amount of time and expense.

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A AusfUhrungsbeispidl the invention is in the drawing shown. In this zeigmι

Pig.1 a schematic on a greatly enlarged scale Axial section shown by a rotary potentiometer, for example. a rotational resistance;

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Pig.2 a section l & NGA the line IX-II of Fig. 1 and

3 a Ssitenaasioht one installed in the Fig.1 Connection contact shown before installation.

A Dr * hpot © ntiomfäter or «17rehwidsrstaad gaaäß-der drawing has an insulating material, foaiepislsweiee plastic, Geap ^ itstfi or göpreSte GeMusekappe i on the open headband duroh a metallic storage picture 2 is lockable and together with these a housing "forms. The end shield 2 iet by means of a concentric a Gswirxdastutzens 2a centrally on one nJÄit drawn in GsrätaehssEiis or another (Crägersles & ent attachable «In ueMuee 1,2 is» i> i resistance element in the form of a Wiokel body 3

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mm . Bar Beftstigungsstutsen 2a of the bearing shield * 2 iat coaxially drilled through and forms a pivot bearing for a drive shaft 5 of a sliding contact 6, which is on a circular arc-shaped loading w * gctngsbah & den Widere tend 4 »it is springy contact pressure it engages · The Sefcleiferkontakt 6 is on a torsion-proof ext inner loading of the drive shaft 3 arranged spring carrier 7 made of theraoplaatleohe« insulating material by one-piece from the latter with the «TsdsrtrXgsr 7 manufactured Zv & rn 7a associated holes of the sole lifter contact 6 are penetrated and rivet head-like widened by Hiteeyerfomung. Arranged between the carrier 7 and the legere child 2 is a spring washer 8 through which the drive lever 5 of the Sehlsiferkontaktes 6 passes

W rotation of the drive shaft 5 », for example by the effect of vibrations, is prevented.

The booths ds »Drahtwideretanda 4 are üuroh soldered or welded connecting lines 9, 10 conductive with connector

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contacts 11, 12 connected, which each dureheetaen the insulating material of a Keppan base 1a of the Gefcäusekappe 1 and are accessible from the outside by attaching Versshaitungsleitung «, a with atn connection contacts 11, 12 identlaah formed further connection contact 13 is the Schloiferkontakt 6 separately. In order to permanently connect this to the open toschluakontakt 13 independently of its respective pick-up division on the circlip arcuate path of movement, the latter is connected to a ring outfeed 14 made of sheet metal via a sliding contact 6, which is conductively connected via a sliding contact 6 Grinding buret 15 »for example t \ UB Edelß4ta3.1, is federiidkoataktiert.

Like the * Pig »1 in particular i'Ji Susatam-ji.han ;? According to FIG. 2, there is a -Widere tandnaXsmeni; 3, 4 from a slit ring, which has a circular quoi ^ johniti: for example. Diose totality <3 _f ring-shaped |

Wideretandaoleißent 3 _S 4 is s.aah of the type ainer- coil spring radially elastic prebiagable -auagö'oiX-dot «DadusOli is it possible to use the resistance element 3? 4 like? _: sine Spyejv.'födßr "due to elastic

iit j -'- iaeraR of the housing cap 1 to be fixed.

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In the case of the execution example, an on the Kunatetoffaaterlal of the Otniusekftppe t sits in one piece in the lfgb * of the cap "bod ·" · 1a injected or prepred abutment 1c, since "Xa is formed with a groove-shaped recess 1d" Xa this bottom dae gteohlitett »ri & gfttnaig · Wider« tanfleel * a «nt 3 ₉ 4 tinrMtbftr, iodeo« β eioh youret btini impressions in the dl · Aueeparun «ld like an explosive spring in the Durohaeestr elaatieoh reduced and itneohllefldie-> thrown into the ring groove 1 £ en eiarwitet. Zn the BavMeXXun ^ uaguet ae tandun «der Hneeut 1d the muffle ring eanteXfläohe of the fiderstoDdeelenente 3f4 wot demen the cap bottom 1a of the Oehäueekapp« 1 ssug · - "• nd the end side about bie au dia with the ringaehee parallel cross and the other littedexat Side a little over the sur & neaalise right-angled cross-sonittedurohneeeer, so that only me a circle-arch-shaped movement path the sole eagerness to "coact" 6 abetändliohe Rin ^ area of the resistance element · 3,4 in the rin ^ iut-colored recess Bindot 1d virrraot. Through this betrayal daa Vlderataadeeleneoit 3,4- auoindeet is anchored in the pressure of the sole contact 6 achitbefoat and duroh the Ie t «te ran due to the elastic, radial ring bracing against the wall of the annular groove-shaped recess 1d also not rotatable.

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Each of the Anechlußkositakte 11, 12, 13 consists of one from the inside of the housing cap 1 by a sliding fit in the insulating Kappenbodsa 1a associated Schiita in the sliding fit solder lug, which bsw with an angled 11a. 12a and 13a of the inner Fahnenenäee against the inside deaKappsnbodssns is abetütabar 1a · Degen the outside istjededer ISTF guessed 11.12 _f. 13 Duroh the free end of the diner out of the Falmeneoene and in this pierceable bast tongue 11b or 12b or 13o can be supported ₉ so that the soldering flag sehw "a3 £: ~, sliding and arehfeet against the housing cap 1 is exhausted"

They SSUM insertion of the LS tfahnen 11, 12 ₉ 13 required slots of Gehäusekapp® 1 to be omitted even at the spraying or pressing from del "Eianststofitaatarial, wherein at least AOOH a further slot% for the additional arrangement at least Lotfaha © may be provided one, the I is conductively connected to a fss ten tap of the wire resistor 4, for example. As can be seen from Pig.1,. the slot © 16 when Spritam or pressing the Kunetutoffkappe ϊ sas ^^ whose material is advantageous helmet only cut out over such a range of material thickness that a thin one

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Closure wall 16a remains. This is pierced when the associated soldering lug is inserted, so that the slot • 16 is broken out over the entire wall thickness.

In order to assemble the rotary potentiometer or rotary resistor, the soldering lugs 11, 12, 13 are first pushed into the cap base 1a of the plastic cap 1 and latched into it. The ring grinding track 14 is also used at the same time by pressing the associated soldering lug 13 with de -

P ren development 13 & permanently connected, for example spot-welded, became. The housing cap 1 is then connected to the drive shaft 5 and thus via the spring bracket 7 connected wiper contact 5 equipped end shield 2 closed, by the free end edge of the housing cap 1 in a recessed or pressed out on the adjacent end shield surface Annular groove 2b is inserted and fixed. This setting of the housing cap 1 in the annular groove 2b of the end shield 2 can for example take place in that on the outer wall 2ba

P of the annular groove 2b pointfönaige along its circumference at a mutual distance Indentations 2bb are made into the plastic material penetrate the housing cap 1. Different

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in addition, the outer groove wall 2ba could also be annular in the the enclosed cylinder jacket of the housing cap 1 will. -

Fig. 3 shows one of the identically designed soldering lugs, for example'd, ie soldering lug 11 before insertion into the housing cap1> J) Ie soldering lug11, like the soldering lugs 12, Ij, consists of a galvanized, silver-plated or gold-plated leaf spring, from which the detent spring 11b is pressed out or punched out. Me leaf spring is at least in the distance of the respective 'wall thickness WD of to. penetrating housing wall from the extended position by a few degrees more than 90 ° _f, for example 96 ° V angled. When inserting the soldering lug 11, the elasticity of the spring material enables an approximately right-angled alignment of the angled portion 11a, which thereby rests continuously against the inside of the penetrated housing wall and ensures a firm fit of the soldering lug. -

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Although the joint application of all previously described i features of embodiment a particularly economical

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Manufacture of a rotary potentiometer or a Preh resistor «It guarantees optimal operational safety Invention is limited to the execution table shown in the drawing. For example, it would be possible to use the Resistive * element in the manner of a slotted sleeve or soheibenfursdgen snap spring and / or with

_fc a »Sohichtwideratand aussuotattoa. Likewise, the resistance could be aaoh of the kind of an explosive spring against an “entrisofcea” or higher abutment. be clamped directly against the inner Gtehttueeirend, if necessary in a ring groove-shaped wall section separated by suction white in contact with the sap bottom 1e of the Oehttueekappe 1. Furthermore, it would be conceivable to deeply suziohen and ledigiicij the GehöusekappG made of sheet metal. in the areas of the connecting oil contacts, if necessary also in the area of the abutment for the Wldorotondßelement, to be made of electrically oil-insulating material , baw.ait also in such a

P stell tea Vfendua ^ eeinraateen to provide.

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Claims (1)

Λψ - ■ '■■. ■ ■ '■': ■ / "■■■ -. '■ P a t β nt ans ρ rtiehe T ^ ßrehpotantiemeter bsw. Rotational resistance, taa-fcohtnd «eat Wlderetendaeloaent with a »Sohioht- or wire resistance and one the latter on a circular arc-shaped path of movement ■ with springy © Kontaktdruok Abrasive sole resistance in an oeehäuae, which has a »threesome« for a drive shaft of the sliding contacts and on the outside with the last aowie "'· ■■■■■■■■■ - ^:. - ■' ■ -. ''" ■ the resistor equipped iet associated Anscalußkontaicten, dadur oh ge k s η ζ ei ο h η et that the lideretead · - element (3,4) of the type NaOH, a ground sleeve, aoheiben- ringfQrndgen or snap ring radially elastically formed and how verbietfMti ¹ a »solohe due to olaatisoher Durohmeeeertoderungen int Gehäuga 1,2 sumindeat in the pressure direction of the grinding contact (6) öohieböaioher as well as through it is non-rotatable feetsstsbar» 2 · Brehpotentioinotar according to Anapruoh 1, d »d u r ο h ge ke η η 1 se h λ ο et that the WideratandBeleeent (3,4) "was lit Movement valley of Schleifericontaktee (6) abetttndliohen Bttlsen-, 109033/1136 20048Ü7 Disc or ring areas in an associated annular groove-shaped Recess (ld) of the inner housing wall or at least one abutment (1d) arranged in the interior of the housing can be latched. 3. Rotary potentiometer according to claims 1 and 2, characterized in that at least the terminal contacts (11, 12, 13) associated areas of the housing (1, 2) and possibly also the abutment (1c) of the resistance element (3 »^) made of electrically insulating material or "are provided with inserts consisting of such, and that each connection contact consists of a soldering lug which can be pushed through from the inside of the housing through an associated slot (16) of the insulating material in a sliding fit, with an angled portion (11a or 12a or 13a) of the inner Flag end against the inside and with the free end of a spring-loaded from the spring plane and into the push-in locking tongue (11b or 12b or 13b) can be supported against the outside of the housing in a non-sliding manner. 4. Rotary potentiometer according to claim 3i, characterized in that each soldering lug (11 or 12 or 13) 't * ■ 109833/1 136 / fS consists of a leaf spring with a punched or pressed-out remainder (11b or 12b or 13b), and that you are free Spring end at a distance of at least the wall thickness to be penetrated WD Jenteprochenden to the free end of the locking tongue by some It is angled just more than 90 °, for example 96 °, and forms the associated bend (11a or 12a or 13a). 5. Rotary potentiometer according to the speech * 1 and 4 »with a to the drive shaft of the wiper contact coaxial as well through these springs * contacted ring grinding surface in electrical Conductive connection with one of the connection contacts, characterized in that the ring slip surface (14) is conductively attached, for example, spot-welded, directly to the bevel (13a) of the solder tab (13) assigned to the bottom slip contact (6). 6. Wire potentiometer according to spoke 3 »old an end wall of the housing and the pivot bearing over the drive shaft of the eiforkontaktee forming bearing shield, thereby marked that the from the soldering tags (11, 12,13) housing areas interspersed with a cap base 109833/1136 BATH ORIGINAL (1a) one, possibly integral with the in its cage Abutment (1o) of the Wideretandeelemeuta (3,4) eylindrisoh aue Plastic-made, Gehiueekappe (1) are formed on free The front edge can be closed by the end shield (2) and forms the housing with it. 7. Rotary potentiometer according to claim 6, characterized in that the falling end edge of the Oehäuaekappe (1) can be pushed into and inserted into one of the Lagarsohildflache recessed or pressed out Hingnut (2b) by ring or distance I oh dot hairy impressions of the outside Groove wall (2ba) can be fixed in the encircled cap casing is. BATH ORIGINAL 109833/1136