DE2265265A1 - CONTACT SPRING PRE-PRODUCT - Google Patents

Description

File number: P 22 65 265.9
Applicant 1 FL Dietorich
Anvaltsakto: 27 h? ^ -? A

Contact for the preproduct

The invention relates to a Kontaktfcdor preliminary product for
Manufacture of contact springs that cut a number of relatively thin wires lying side by side
and at least one bridge of conductive material interconnecting the fsc wire sections.

It is known to have potentiometer contact springs with small
Manufacture dimensions by using small round or rectangular meshes that are arranged parallel to each other and attached to each other. are connected to one another at one end, the free ends of which form the corresponding contact fingers. Such
Multiple wire contacts are disclosed in US patents
3 3? 3 707 and 2 76Ο Ο36.

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According to dom in US Pat. No. 3,323,707 discussed ancestors dio contact wire springs individually handled and individually in Clamps, brackets or clamps attached, in which they are welded or soldered on. In view of the small dimensions of the individual wire springs, this treatment is extremely difficult and time consuming, so that they are therefore suitable for mass production is not approved of such a contact spring. It would be desirable, not the necessary processing operations to have to do with a single contact spring, but rather to be able to perform on a larger workpiece that is safer and easier to handle than the individual contact spring.

In the method described in US Pat. No. 2 j60 O36 for producing potentiometer contact springs, a wire is wound in a spiral around a carbon rod, and a copper plating is applied to the entire winding body on an electrolytic layer so that all wire turns lying close to one another through the Plating are connected to one another, and then the winding body is cut open axially and stretched to form a sheet-shaped workpiece. The sheet-shaped workpiece is now coated at certain points with an acid-resistant material, after which a contact spring is produced by an etching treatment, which has an end section consisting of wire sections that are not connected to one another and a holding section formed from the copper plating. The contact ends are then shaped.

This known method is also uneconomical in that than that in each case only

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a single contact spring can be made; after cutting Although several blanks can be formed of the winding body, they must each individually follow the subsequent ones cumbersome process steps of coating with acid-resistant Material, the etching treatment and the neutralization are subjected. Also with regard to these procedural steps considerable manageability problems, since the blanks only have small dimensions.

The invention is based on the object of a contact spring intermediate product to create something that is safer and easier to handle leaves as the single contact spring and that for the end user the possibility of an individual further processing to contact springs offers.

According to the invention, this object is described in the introduction Xontaktfoder pre-product solved in that the contact spring pre-product a plurality of the Kontalctfedern, which are connected at their ends, receives one another by a corresponding number held together by bridges and separated from each other by cuts can be separated perpendicular to the wire sections

The contact spring precursors according to the invention can be used during the individual required processing operations significantly safer and easier to handle than the individual contact spring. the end For this reason, the primary contact spring products can be sold directly to the consumer are offered, who can process them further to produce the final contact springs, with the There is the possibility of individual further processing, depending on the requirements placed on the contact springs. About that

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In addition, hot dor Vorbrnuchor d.ic possibility in case of inheritance of the preliminary product ous dipfcm i'iiio cn tsprocbondf In number of contact springs with different dimensions hoi'Z'i? share.

Voi'tei lhaf tev.-ici.ä e the dro'i trbschpit te consist of a valuable metal alloy and vpison a diameter of otwn 0.05 to 0.1 '-im. The bridges consist of 7Hg.-jV'c.i.sp c.xle galvanically applied silver, copper or Mickel.

Ti! ; 'weckr'äi? igo 1. · Ansjostpi tnnr ^ do.v invention; Contains dps Kontaktf odor-Vo? .- p ro duct ^r ::>. n ° Number of side-by-side connected ICoritp'ctf ede. r? i obtained by cutting up p? -rallpl zu den Drn.h.tab ^ ehnittor: separable from each other s ^: j.id.

The e.vfind-ir ^ sg (.. n; '^; Ae contact spring preliminary product can therefore πν mehroron.entspricht, either directly by sections perpendicular been separated to the Drahtp.bschnitton, so characterized DNSS several Koiitaktfedcrn v recovered. erdcn ^r, r od ° in 'lotztcennnnton first case by cuts perpendicular 7u the wire sections are separated into strips wonnch di e Strips can be separated into individual contact springs by cutting up parallel to the wire sections.

In order to protect the parts of the wire cut-offs lying between the bridges made of electrically conductive material while the contact spring preliminary product is being sliced open, a further

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Embodiment dor Srfindim ^ c7 \ -> ? Λ -iseher: don bridges r.iis olelectrically conductive material li ^ ~ ond ^rt tt parts of the wire sections by a ρ electrically non-conductive protective maskior- ^ · hoSeclct. The y. \\? C ratio can advantageously be used

Bridge? " ^{1. Επί 1} ? Ololütripfh Π oitondoni Mntori" ¹ ! vcrv ^ ndct ° Mn ^! "icrnτ ^1. ""· di e dip f? rci1 ie / TToideii Π ^ ρΐτ tcsbpcl? Tiittο ^ riVo ^ t ₄ Vei ^ o" -ST ¹ II- ¹ OIi. T) io Mnc-ko Icmr. dni-m P "n-ipor ontε ¹ ^ r ^{r> Λ} ^ '"^' Ίθ "Stf? i1 <5 hereinafter Βο ^ ι ^ οίΐηη £ ϊ5Λ ^Γ οΐ · ί'ο.1ΐΓρη siitfomt verdon ·

For the orfindunpfsgcmfi.De Kontrl-; tfcder-Vorprc'3.ii7 £ t Tindo L Eorarlcrvoiso cirx usual:?! ¹ Drniit pit round ^ inr ~ clinitt \ ^r oCT-rcrid.unij · Beside such Tii-.ndd .i'illT.tcn körinon jedoel · micTn Ργγ'Ίτ + ο rii L ggof Xpe.Tit Qivi Ouorselmi11 vex-vendot verdor ■ So T- ^r ird "bcl ^ piols ^ ioisc -ine A-aüfülix-ui ^ sforra beA ' Orrzugt, box dor the cross-section of the wire section is flattened in such a way that go ^ o ^ i- ^ Gi-liegondo are flat and gcgonüborliogöndo arched obex-flHchon formed, the distance between the gci ^ ciivbcrlio ^ ondon flat surfaces being smaller than dor distance, between the opposing arcuate. Surfaces and wherein the flat wire separation surfaces are side by side. Since the distance between the normal flat surface surfaces is smaller than the diameter of a corresponding round wire, it is obvious that wire sections can be accommodated on a given width if a flattened wire is used instead of a round wire or, which consists of wire sections with a flattened cross-section, more contact points than a contact spring, which has sections of fret wire .

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spring contact points is destroyed. The use of a flattened wire has the further advantage that this is inherently stiffer than a round wire with a diameter equal to the distance between the opposing flat surfaces. The flattened wire therefore has a greater moment of resistance in the bending direction, so that a good contact pressure is obtained on the resistance surface.

The following is used to better illustrate the invention detailed description of preferred embodiments in Connection with the attached drawing, of which

Fig. 1 is a perspective view of an inventive Contact spring preliminary product shows as well as the corresponding

Steps to Vcitor ^v crn.working j

Fig. 2 shows a contact spring fastened in a potentiometer in Shows section in contact with a resistive surface;

3 shows a partial section through one located on a winding mandrel Winding body using a round threat shows that for the production of the contact spring preliminary product according to the invention is used;

FIG. H shows a section similar to FIG. 3, a wire with a flattened cross section being used instead of a round wire} and

5 shows a cross section through a flattened wire, like or formed by flattening a round wire

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being, with the original in a dash-dotted line Dimension of the round wire is indicated.

A method for producing the contact spring preliminary product according to the invention is described, for example, in DT-OS 2 224 782, so that the details of the production method need no longer be discussed at this point. The procedure is that a winding body consisting of several adjacent wire windings is produced on a winding mandrel by winding a wire, the wire windings are connected by electrolytic application of a plating that forms bridges between the wire windings and the winding body is cut open to form a sheet-like workpiece which represents the contact spring intermediate product according to the invention. The method described in DT-OS 2 ?? Λ 782 is characterized in that, prior to plating, a non-conductive masking is applied to the winding body in a pattern which has at least one covering strip extending parallel to the winding axis, followed by plating takes place in the electroplating bath and, after plating, the masking is removed. 1 shows a contact spring preliminary product 22 according to the invention, obtained after the winding body has been cut open, which has the shape of a sheet-like workpiece. The preliminary product contains a plurality of contact springs which are connected at their ends and are held together by a corresponding number of bridges. The strips forming the exposed wire sections are denoted by 21 in FIG.

The contact spring intermediate product 22 according to the invention can now on further processed in different ways, as shown in FIG. 1

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is. According to a first mode of operation, the preliminary product is separated into individual contact spring blanks 25 by cuts 23, 2k perpendicular to the wire sections, which can be guided both in the area of the strips 21 and in the area of the bridges 20. The blanks 25 produced in this way, which have free wire sections 26 not provided with a cladding at one end and a bridge 27 provided with a cladding at the other end, can then be made into individual contact springs 29 and "} through cuts 28 parallel to the wire sections. the cut lines are separated in any desired width 0th 23 and 2k do not necessarily have gehenj through the center of the respective strips 21 and 20 but this is less difficult than to cut, for example, at the junction of a strip 21 and the adjacent strip 20th

The subsequent shaping of the wire cuttings 26 into rounded contact points is shown in the punching arrangement 31 and 3-. This treatment should be carried out before the wire sections are heat-treated in the usual way in order to produce a sufficiently high degree of hardness, pre-locking resistance and spring properties. The contact spring produced in this way can finally be spot-welded at 33 onto a carrier Jk , as shown in FIG. The sections 26 lie under pressure on the surface 36 and are displaceable on the surface 36 in the usual way by means of a carrier Jk.

Instead of first lowering the blanks 25 through cuts 23 and 2k

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To form right to the wire sections, the preliminary product 22 can also be separated parallel to the wire sections by cutting lines 38 in order to obtain blanks 39 which contain contact springs 29 which are connected at the ends. These blanks 39 are then further processed by cuts Uo perpendicular to the wire sections to form individual contact springs 29, which can then be shaped and heat-treated, as has been described above. The cuts 38 can be spaced at any desired spacing, thereby forming blanks 39 which, if so desired, have a lateral width which is greater than ¹ than that of a single contact spring 29. In this case, cut '40 would provide a blank similar to blank 25, with a cut 23 being required to sever a single contact spring 29 therefrom.

The wire which is used for the production of the contact spring preliminary product according to the invention can consist of a large number of materials depending on the requirements. Valuable metal alloys are preferably used; the wire can, for example, be made from a heat-treated alloy of. about jP- ^ i palladium, 27? ^ silver, 17; ' Copper, 1 '| $ platinum, 9 $ gold, the remainder zinc. As far as the shape of the wire used is concerned, it can, for example, have a round cross-section, as shown in FIG As mentioned above, the winding of a wire on a winding mandrel is the first process step for the production of the inventive contact or preliminary product.

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Figures h and 5 show further embodiments of the invention, ^ in which the pre-product is made of wire which has a changed mop 5 ratio. Before the wire is wound onto the mandrel 12 to form the body 11, it is flattened so that a flattened wire cross-section 69 is formed which contains opposing flat surfaces 70, 71, the distance between which is indicated by the elevation H, and opposing arcuate surfaces 72, 73i whose spacing is denoted by the diameter D. This process of flattening can be carried out by reacting yen the wire between two Wal can pass, the same on de ".. Flatten · opposite ¹ pages in Figure 5 is shown, obtained by <""■■'■: Flattening of the originally round brace 11 has relatively flat opposite wire surfaces 70 and 71 and on the top and bottom surfaces 72 and 73 which connect the surfaces 70 and 71. The flattened wire is placed on a mandrel 12 accordingly 3 wound in such a way that the flat upper surfaces 70, 71 of each turn lie laterally against one another and the lower arcuate surface 73 comes into contact with the mandrel 12. Since the height H of each wire turn is smaller than the original diameter of the wire 11, it is evident that more turns of wire can be applied to a given width on the mandrel 12 if, instead of the original round wire, the flattened wire is used. For example, FIG. 3 shows eight turns of the round wire 11, while FIG. 1 shows twelve turns of the flattened wire 69 on the same mandrel width. The same applies with regard to the number of wire windings, of course, also for those made from the respective bobbins

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Contact spring preliminary products. Therefore, a contact spring which is produced from a winding body according to FIG. H has more contact points than a contact spring which is produced from a body according to FIG. 3, although both have the same width. It is also important that the process of flattening the wire does not destroy the arcuate surface at the spring contact points.

The wire windings can be made by placing the two "rollers vertically near the mandrel 12 so that the wire reaches the mandrel 12 in the correct orientation. In addition, a finger (not shown) can be provided, which presses each wire turn as it is wound onto the mandrel 12 against the previously wound wire turn, so as to be one close to one another to get horizontal winding.

Apart from the fact that more wire sections are obtained on a given contact spring width with a flattened wire of height H, the flattened wire has the further advantage that it is inherently stiffer than a round wire with a diameter corresponding to height H. This is evident because the wire diameter D is larger than "the diameter of the round wire and the flattened wire therefore has a larger moment of resistance in the bending direction, so that a good contact pressure on the resistance surface " 6 is obtained.

In one embodiment, a round wire of 0.075 was now Rolled diameter to obtain a flattened wire which had a height H of 0.05 mm and a diameter D of Q.104 mm. The salting resulted in the wire being lengthened by about $ 3

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became. The relative values of D and H are of course dependent on the type of wire material used. A contact spring made of a flattened wire 0.05 mm in height would have the same number of wire ab sclinit th as a contact spring of the same width made of round wire with a diameter of 0.05 mm. Be 10k mm stiffer.

The flattened wire can be made to have a height less than 0.05 mm, if necessary. In this form it can be used to manufacture extremely small contact spring wire sections with a height H of 0.025 mm or less can be used at a price considerably lower than that of round wires of the same shape, while at the same time a stiffer, better contacting wire section than with round wire will.

The mandrel 12 used to produce the contact spring preliminary product according to the invention can have a diameter of about 20 cm, and the winding body 11 can be wound onto the mandrel 12 over a length of about 30 cm. A preliminary product 22 can thus be produced which has an area of approximately 30 χ 6 cm,

ρ
ie about 1800 cm. A typical single contact spring measures approximately 2.5 ^ χ 2.5 ^ mm, that is, 6.45 mm. The pre-product mentioned above would thus contain about 28,800 individual * contact springs.

To be able to produce dimensions «

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Claims (1)

Claims . Contact spring preliminary product for the production of contact springs, which have a number of. have relatively thin wire sections lying side by side and at least one bridge made of electrically conductive material which pre-binds these wire sections, characterized in that the contact or preliminary product (22, 29) contains a plurality of contact springs (29, 30) which are connected at their ends, are held together by a corresponding number of bridges (20, 27) and can be separated from one another by cuts (23, 24, 4o) perpendicular to the wire sections (6). BATH ORIGINAL 709817/0385 "2. Kontek t foclo r" - · Vo t'procln ¹ ; ': according to claim 1, dadui'oh ^ okorui.-rc lcli ⁿ .v'", d ~ P · ¹ L ^ DitIi Ip.hschnit ⁽ : c (.? r) am ολίογ wc! '.' ^ ■■ icruii ^ and ■: ■> ii? r diameter of η twa 0.05 hi.s 0.1 Pim ^ ufvcisrn. 3. I <Oi; tr · '- "'" red '\ - preliminary product. ^ RIi.! Nsprucl' 1 odor P., a by ^ ckon: _lzo ; ..- Vii jt, '-.ΓΙ: Ji e Brückon ("0,? 7) au ^c vor ~ uj ^ v.'oif ο jal- \ ■"'.i'icli -iu.rjcbraohtopi Si.lbor, Muj ^ for odor Niclcol bcstohrn. • Ί. Koatp.ktf ^ dr • r-Vorprodn.i't 'iacT * ei π ·'"· γπ: 1it Anspr ^r i.o 1-3» '"!" By 2 ^ konnζc.'. CTino t, c ^1r ' ⁿ or a number ¹ ZOIi noboiielriafidoj' li "£; oMd vc ^ hinc'cnor Ko at - ^ r ί: Γ" thorn (^ 9) onthält ", dio through. Zorschiieido (? ^{> N} ) p ^ "- '' IIpI to the Drn.htabscbni tt '.? I" i. ("- ^) from each other t.ronnb-r oJ ^ d. 5. Contact spring precursor aveh cino ': i dor An / ipriiche 1-- !, ^ okcnnzoic'nnot, doß dio rivischcn c'on bridges (^ 0, .? 7)? -U oloktrisoh T ^ itondorn metal lio ^ ondon Toilo the Dm ¹ I tnbschnitto (.? 1, 26) are covered by an "electrically non-conductive rchii tzrndo Mnski ^ runj. ITontaktfeder-Vorprodnkt no.rTi one of the claims 1-5 »thereby CckoüUTcichnot, dnf * cTrr ^ i or se hm *, tt (6p) the wire sections dorrrt from £ joflr: .cht is, dnO ß-egcn tricking flat (7 ° > 71) and cesonüberl '' .o / jondc bo ^ oTiforrr.i / jc (7 ^ »73) surfaces 2 ^G ~ is been, '-roboi the Abrtand II? wischon the {^ per onüberlieijorden flat! surfaces (70 , 71) is smaller than the distance D between the arc-shaped surfaces (72, 73) and -ί -. 'Oboi the flat wire sections flatter: lying side by side. BATH ORIGINAL 709817/0386