DE2238771A1 - FORK CONTACT SPRING AND METHOD OF MANUFACTURING IT - Google Patents

Description

dE'Ii Kontakt-Bauelemente GmbH

iiürnberg - '"

Ü..D, ABSum-H.G. Mirbetn 3-22

Fork contact spring and process for their manufacture

The ürfindung is based on a one-piece, self-resilient Fork contact spring made from a U-shaped body made of .jplachmaterial with molded contacts, especially ' for ilinsetaen in the housing chambers of contact spring strips, as well as a process for the production of such fork contact springs.

There are already various embodiments of. Fork contact springs known in which the spring essentially are bent in tuning fork shape or iyra shape and most of them are arranged in housing chambers of contact spring strips, which are intended for receiving printed circuit boards are »in the formation of such fork contact springs certain requirements must be met. So are the dimensions of such springs by means of standard determinations i> set. In addition, there is a certain spring deflection, a certain contact force and "mostly also a certain type of connection prescribed for the lead wires to be connected.

For example, Jo is from the German disclosure document 1 615 846 a one-piece fork contact spring and a method known for their manufacture, which essentially

Fri / br - July 28, 1972 · / ·

409809/0 03 9 '

^ "f

li.U.Assuti-.H.G.ilir'beth 3-22

consists of a tuning fork-shaped spring link and an attached, formed -tab for the electrical An: = chitin consists ...

./eiter is from the German Offenlegungsschrift 2 Q4ö 900 a one-piece fork contact spring with solder and / or tfikkelansehiuj flag known that from an essentially Lyre-shaped bent pair of spring legs with one molded onto it rod-shaped connection exists.

In the German Auslegeschrift 1 Cü2 645 there is a gate-shaped one Contact spring described, the legs of which have an approximately square cross-section and around the longitudinal center axis are each twisted by 90 ° in opposite directions. .

These known designs of one-piece and Self-resilient fork contact springs have the disadvantage that they only deal with and with a relatively large amount of effort Lasaen produce numerous process steps. and that In addition, the Pederung properties are significantly affected by the Deformation steps depend on their manufacture. In the case of fork contact springs, however, the spring properties play a role play an essential role and it comes here to constant and reproducible Pedering properties that can be produced in a simple V / eise with low tolerances.

From the German patent specification 1 065 584 and the German Offenlegungsschrift 1 903 043 are also U-shaped fork contact springs known from sheet material, in which Eontaktteile bent at right angles are formed on the leg ends are. -. ■ ■, _.

• A 409809/00 39

R.J. Assum-H «G-. Hirbeth 5-22

Since the two opposite contact members in the plug must form a funnel-like receiving opening for the otekker, the contact parts are bent inevitably * The formation of such a bent contact portions by ¹ J rectangular bending of sheet material is very difficult. The flat material must not exceed a certain thickness, must be easily deformable and the contact parts can only be relatively narrow.

The object of the invention is to provide a U-shaped, self-resilient To design fork contact spring with molded contacts in such a way that fl.aß the thickness and composition of the flat material im can essentially be selected according to the spring properties and that the width of the contacts is not limited is. '. · · -

The invention thus relates to a one-piece, self-resilient one U-cable contact spring of the type mentioned and " is characterized in that the contacts are made of bent Flacli material and connected by a straight, right-angled bend with the legs of the U-round body are.

A rectilinear .rechtwinkelige Äbbiegung can easily at arbitrary flat material prepared so dais this be-can be selected solely on its Fedexungseigenschaften and sized ", the üabelkontaktfeder according to the invention does not dai ¹ is simple to manufacture, but also advantageous and reproducible cushioning properties with small tolerances "owns the. are only slightly influenced by the individual YeT process steps.

4Q98Ö9 / 0SJ39 ^{λ /} *

R.S. Assum-H.G. Mirbeth 3-22

In addition, the width of the contacts can be chosen as desired, since they do not depend on the deformation properties depends on the flat material. '

Such flat material parts can easily through Stamping are made from a tape, in such a way that the dimensions of the stamped part are constant within narrow limits being held. But since the suspension properties of the fork contact spring according to the invention of the shape of the Depending on the flat material, fork contact springs with reproducible and favorable suspension properties can be created in a simple manner can be produced cheaply.

The legs of the U-shaped body of the fork contact spring according to the invention are preferably in the form of beams of equal strength. This means that the Width of the legs of the U-shaped base body decreases from the closed end to the open end, namely in such a way that when the ends of the U-shaped base body are bent to the side, the legs are essentially at is bent evenly in all places. This has the effect that the legs of the U-shaped base body on act as a spring over their entire length and not only at the transition point between the legs and the connecting part of the base body be turned off.

The contacts, which are also made of flat material, do not serve as springs, but only have the task of to mediate contact with the plugs. As is known, the contacts are bent in such a way that they are attached to the Approach the contact point and then an insertion opening

409809/0039

'R.S.Ässum-H.G. Mirbeth 3-22

for the plug "form. The contacts are on the inside the free ends of the legs of the U-shaped base body integrally formed and can be produced with this at the same time in a simple manner by punching and bending "■ will.

In the fork contact spring according to the invention, the contacts have at the transition point to the U-shaped base body a.tighter width than at the point of contact. The facing surfaces of the contacts are on the Contact point in a manner known per se with a noble metal, plated. On the closed side of the U-shaped The base body is formed with a solder and / or angled connection, which is preferably at right angles to the basic body has turned. An approach serving as a winding connection preferably consists of folded flat material, to give the wound wire a better hold.

On the transverse web of the U-shaped base body, a fastening attachment is also formed in a manner known per se.

All parts of the fork contact spring according to "consist of the invention Made of flat material of the same thickness, so that the fork contact spring can be simply punched and bent can be produced without deformation of the material in its strength is required. In this way, constant suspension properties and a simple Manufacturing process achieved '. .

To ensure a good position of the fork contact springs in precise chambers To achieve contact spring strips, it can be advantageous if the U-shaped base body out of its plane is deformed so that the center lines of the contacts and the center line of the solder or coil connection in one plane lie. 409809/0039

R.o. Assum-H.G. Mirbeth 3-22

The invention also consists in a method for producing fork contact springs in which the contour shape the contact spring transversely from one with a plating strip provided band is punched out, then the contacts are formed by bending and finally the contacts as well as the soldering or winding connection in the right Angles to be bent to the base body «*

The invention is based on the
will.

Fig. 1 shows the fork contact spring according to the invention in

Front view and
Pig. 2 in side view.

Fig. 3 shows the shape of the stamped part from which the fork contact spring manufactured according to the invention by bending will,

As can be seen from FIGS. 1 and 2, the fork contact spring according to the invention consists of a U-shaped base body 1 made of flat material, on the two legs of which the contacts 2 and 3 are formed. The legs 1a of the U-shaped Base body 1 are dimensioned in their width so that they form carriers of the same strength, i.e. that they at a side impact, e.g. when inserting »© ines, iteckers between the two contacts 2 and 3 are bent as evenly as possible over their entire length.

This is achieved in that the width of the legs 1a is made wider near the crosspiece of the U-shaped base body are than at their free end. In one embodiment for a fork contact spring according to the invention the thigh width at A 0.6 mm, at B 0.8 mm.

400809/0039 / *

R. S. Assum-H. & * Mirbeth 3-22

Contacts 2 and 3 are made of the same flat material like the U-shaped base body 1 · and are arranged on the inside of the free leg ends, namely on small lugs 1b of the legs of the U-shaped base body. Contacts 2 and 3 are initially to one another bent and form the contact point at 2a or 3a. At this point the connector pin penetrates between the "both contacts 2 and 3 and presses them together, the spring action of the legs 1a of the U-shaped Base body T is generated .. The free ends of the contacts 2 and 3 are bent apart in a known manner, so that they make an angle of about 100 °. form with each other. This ensures that the plug pin can be inserted properly even if the plug is inserted at an angle. The contacts 2 and 3 are plated with a noble metal on their insides at the contact point 2a and 3a, respectively. The plating takes place already on the output strip from which the fork contact spring is made by punching. So there is no separate process step for plating the contacts after-making the contact spring required.

In order to keep the tolerances occurring as a result of the bending process small, the bending point is between the shoulder 1a the legs of the base body and the contacts 2 and 3 are placed as close as possible to the contact point 2a and 3a.

On the transverse web of the U-shaped base body 1 is a loading ' Fastening approach 5 formed in a known per se Way serves, the fork contact spring in the housing chambers of contact spring strips nagh kind of a hinged flap to fix.

40980 9/0039

In one corner of the U-shaped base body 1, a solder terminal lug or a winding terminal is also formed. The soldering connection lug 4 "is also made of flat material and is bent perpendicular to the surface of the base body 1. It preferably contains an opening or an incision for introducing the wire to be soldered.

A winding connection lug can be made from a strip of the flat material exist, similar to the solder terminal lug shown in Figures t and 2 perpendicular to the plane of the U-shaped base body 1 is bent. To ensure a good fastening of the coiled wire, the winding connection lug is preferably made of sheet material folded in the longitudinal direction.

As can be seen from Fig. 2, the contacts have their transition point to the U-shaped base body 1 has a finger width than at its free end.

To better guide the fork contact spring in the housing chambers To ensure, the U-shaped base body 1 is preferably bent from one plane in such a way that that the center lines of the contacts and the center line of the solder connection or the winding connection in one plane lie. This can be seen in Fig. 2, where the U-shaped base body 1 is slightly bent twice so that the Center line of contact 2 with the center line of the solder connection 4 coincides. Such a slight kink of the base body 1 has no effect on the spring adverse influence.

The fork contact spring according to the invention can be very easy to manufacture in just a few process steps. According to the invention a strip is assumed

401809/0039

R.S. Assum-H.G. Mirbeth 3-22

Flat material from which the raw body of the fork contact spring is made be punched out. ' The punching is done transversely to the longitudinal direction of the flat material strip. This has the advantage that the starting material strip already has a plate ' . trim strips can be provided so that the finished fork contact springs "already in the right place, namely at the point of contact that wear the plating,

Fig. 3 shows the stamped part which is stamped out of the raw material. The starting strip from which the in Fig. 3 is punched out, carries a plating strip, which is arranged so that the contacts 2 and 3, as shown in Fig. 3, the platings, 6 and wear. The stamped part "shown in Fig. 3 is transverse to Punched out the longitudinal extension of the starting tape. The plat-

, 15 ting from the starting strip is chosen so that the platings 6 and 7 "on the finished fork contact spring the contact point 2a ″ or 3a come to rest • Stamped part according to Fig. 3, the contacts 2 and 3 as well as the solder connection 4 are still in the same plane as the U-shaped base body 1.

The contacts 2 and 3 are first shaped as. this is evident from FIG. 1. Then they will be along the bend 8 and 9 bent so that they are perpendicular to the ΙΓ-shaped Base body 1 lie. At the same time or in a separate process step, the solder connection 4

bent around the bending point 10 so that it is perpendicular to U-shaped base body 1 comes to rest.

409809/0039

R.o. Assum-H.G. Mirbeth 3-22

The manufacture of the fork contact spring is thus already in accordance with of the invention ended and it is that in Figs shown shape has been obtained. If necessary, the U-shaped base body can also be bent slightly 1, as shown in FIG. 2, may be required ".

The spring properties of the contacts result solely from the material from which the fork contact spring is made and from the dimensions of the U-shaped base body. The starting material also determines the width of the Legs of the U-shaped base body 1 and their decrease in relation to the free ends. Through the punching process the dimensions are adhered to very precisely, so that reproducible suspension properties are always obtained. In particular, there is no deformation of the thickness of the material, but the thickness of the material in the finished fork contact spring is the same everywhere.

Investments

13 claims
2 sheets of drawings
1 Directory of
Reference number

9809/00

Claims (13)

R.S. Assum-H.G. Mirbeth 5-22 - "" "■ -. 223ο / / 1 "Claims One-piece., Self-resilient fork contact spring made of with a ΰ-shaped base body made of flat material molded contacts, marked with Ii, that the contacts (2, 3) consist of drawn sheet material and a straight, right-angled bend (8, 9) with the Legs (Va) of the base body (1) are connected. 2.) GabeIkontaktfeder according to claim 1, characterized in that that the legs (1a) of the base body (1) have the shape of beams of the same strength. 3.) fork contact spring according to one or more of claims 1 or 2, characterized in that the Contact point (2a, 3a) of the contacts (2, 3) is as close as possible to the transition point to the base body (1). 4 ·.) Fork contact spring according to one or more of claims 1 to 3, characterized in that the Contacts (2, 3) on the inside of the legs (1a) of the base body (1) are formed. 5.) fork contact spring according to one or more of claims 1 to 4, characterized in that the contacts (2, 3) at the transition point to the base body (1) have a smaller width than at the contact point. A09809 / 0039 R.S. Assum-H.G. Mirbeth 3-22 6.) fork contact spring according to one or more of claims 1 to 5, characterized in that the ends of the contacts (2, 3) are at an angle of about 100 ° to each other. 7.) GabelkontaMfeder according to one or more of claims 1 to 6, characterized in that the each other facing surfaces of the contacts (2, 3) are "plated". 8.) Fork contact spring according to one or more of the claims 1 to 7, characterized in that a soldered and / or rocker connection (4) at one corner of the U-shaped The base body (1) is integrally formed and lies in a plane perpendicular to the base body plane. 9.) fork contact spring according to claim 8, characterized in that that the winding connection consists of folded flat material. 10.) Fork contact spring according to one or more of the claims 1 to 9 »characterized in that a fastening attachment on the crosspiece of the U-shaped base body (1) (5j is molded. 11.) Fork contact spring according to one or more of the claims 1 to 10, characterized in that all parts consist of flat material of the same thickness. 409809/0039 R.S.Ässujn-H.G.Mlrbeth 3-22. ', ...' ' 12.) Fork contact spring according to one or more of the claims 1 to 12, characterized in that the U-shaped base body (1) out of its plane is deformed so that the center lines of the contacts (2, 3) and the center line of the solder or coil connection (-4) lie in one plane. 13.) Process for the production of fork contact springs according to one or more of claims 1 to 12, characterized characterized in that the outline shape transversely from a with a tape provided with a plating strip that the contacts are formed by bending and that the contacts and the solder or winding connection be bent at right angles to the base body.