DE3019841A1 - CONTACT SPRING FOR TAPE CABLE CONNECTION - Google Patents

Abstract

1. A contact spring for a flat cable connection comprising a U-shaped base part (2) and two contact spring arms (3a, 3b) which project at right angles from the arms of the U (30, 31) of the base part and together form a contact spring contact (4) for a contact pin or contact blade, and which can be inserted into a channel-like cavity of a contact spring strip with the base part being arranged transversely to the course of the cavity with the contact spring arms leading ; and having a pair of contact blades (16) which project from one of the two arms of the U of the base part in opposition to the course of the contact spring arms and which protrude from the contact spring strip and form a cutting clamping contact for a wire-form conductor, characterised in that the arms of the U (30, 31) of the base part (2) are so dimensioned as to have different lengths ; that the contact spring arm which protrudes from the longer arm (30) of the U is formed as a rigid plate (3a) having a width which corresponds to the length of the arm (30) of the U ; and that the springy contact spring arm (3b) which projects from the shorter arm (31) of the U has a width which is less than half the width of the rigid plate (3a) ; that, furthermore, the springy contact spring arm (3b) is arranged approximately centrally with respect to the rigid plate (3a), and at its free end (32) is provided with an attachment (34) which is directed away from the free end (33) of the arm of the U (30, 31), but set back in relation to the edge of the rigid plate (3a), and which widens the contact spring arm (3b) at one side ; and that at its free end (36), the rigid plate (3a) has an incision (37) separating a flat part-region (38), which essentially lies outside the projection of the springy contact spring arm (3b) on to the rigid plate (3a), and another part-region (39) which cooperates with the springy contact spring arm (3b) and is bent in towards the latter at its end.

Description

* # m ι mm · · ι

SIEMENS AKTIENGESELLSCHAFT Our reference? Berlin and Munich VPA

8OP 6 5 97DE

Contact spring for ban, 2-cable connection ! (Addition to patent 26 07 693)

The invention relates to a contact spring for ; Ribbon cable connector with a U-shaped base and two from the U-legs of the base part protruding at right angles, together a contact spring contact for pure Contact pin or a contact blade forming contact spring, which is in a channel-like cavity a contact spring strip with a base part directed transversely to the course of the cavity and with the contact spring legs can be used in advance and with one of the two U-legs of the base part opposite an insulation displacement contact protruding from the contact spring legs to the course of the contact spring legs for a pair of contact blades forming a wire-shaped conductor, according to patent 26 07 693.

Such a contact spring is known from DE-PS 26 07.

In order to ensure a secure fit of the contact spring in the cavity of a contact spring strip with this contact spring ensure, it is necessary to measure the U-legs of the base part relatively long. Hence this is Contact spring for a connection technology in which the distances the individual conductors of a ribbon cable are relatively small from each other, less suitable.

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The object of the present invention is therefore to provide a contact spring of the type mentioned in such a way that it is still simple in terms of production engineering operationally safe in the cavity of a contact spring strip can be arranged, even if the contact grid between the individual contact springs of the bar only allows relatively small distances.

According to the invention, this object is achieved in that the U-legs of the base part are unequal are long dimensioned that the protruding from the longer U-leg contact spring leg as a rigid plate with one of the length of the U-leg corresponding width is formed and that of the shorter U-leg protruding resilient contact spring legs has a width that is less than half the width of the rigid plate is that the resilient contact spring leg is arranged approximately in the middle of the rigid plate, . and at its free end with one directed away from the free end of the U-legs, opposite the edge of the rigid plate, however, set back. The contact spring leg is provided with a broadened approach on one side.

Due to this design of the contact spring, despite the relatively shorter design of the U-legs, a secure one Transmission of the forces occurring when contacting a single ribbon cable to the contact spring strip guaranteed because in particular the one lying outside the projection of the resilient contact spring leg Subarea of the rigid plate uncomplicated in a pocket dimensioned accordingly for this subarea the contact spring strip can be inserted and thereby a stable form fit between the contact spring and the strip housing 'is made possible.

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Further embodiments of the invention provide that a cutout is provided between the part of the longer U-leg that is curved at the root and the rigid plate, so that the maximum width of the rigid plate can be made flat, as it does not Because of the curved course in the connecting area of the two US legs of the base part, the U legs must also be curved in this area} that the rigid plate has an incision at its free end to separate a flat one, essentially outside the projection of the resilient contact spring leg onto the rigid one Plate-lying sub-area and one with the resilient contact spring leg cooperating, at the end bent in the direction of this, other sub-area, whereby at least at the free end of the sub-area of the rigid plate cooperating with the resilient contact spring leg, a suitable for making contact with a contact pin or contact blade h section is created with the formation of an introductory funnel.

Finally, within the scope of the present invention, it can also be provided that the flat portion of the rigid Plate is provided with wart-like projections and that the limited by the contact blades, the Insulation displacement contact forming contact slot opposite the contact spring contact formed by the contact spring legs is transversely offset.

This way, the one in the pocket of the ledge housing retractable portion of the rigid plate held in the pocket because the wart-like Press the projections into the plastic compound of the strip housing, which when the projections are pushed in impressions caused, however, are in that of these

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I ■ -V "; Γ ::» '. Χ: "| 3019841

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V ₁ projections only swept area again

h at least partially recede, so that the

Y automatically lock jumps in the strip housing.

& 5, The transverse offset of the ■ contact slot with respect to the

_tJ contacting gap of the contact spring enables

[ on the side of the contact spring leg contacts

ty to realize rectangular contact grid -da * if you

L iz.B. the degree of dislocation is equal to a quarter of the

γ _Λ 10 grid spacing of this contact grid »dimensioned, and the

/, Contact springs in two rows with in a row to the

Contact springs of the other row against each other

),! exchanged contact spring legs, whereby self-

t understandably the contact spring strip should be designed in this way

15 must be that the rigid to accommodate the sub-area

; ■>! The housing provided with the plate, pockets on each side

^f because ε are in the right place, the contact slots

- Corresponding contact springs of the two

i rows at one contact spring by a quarter of the

20 grid dimensions on one side and on the other

j contact spring by a quarter ^. of the grid dimension after the

I have shifted the other side, so that in the case of a ribbon cable with half the grid spacing of the contact

i spring limbs of the contact springs contact formed "

I 25 spring contacts adjacent individual conductors,

k only one single conductor from one contact slot

I a contact spring is detected.

I An embodiment of the invention is shown below

t 30 explained in more detail with reference to three figures. Included

I show, each greatly enlarged, the

I Fig. 1 and 2 the contact spring in side view once

I looking at right angles to the thighs of the

35 base part and once with a line of sight parallel to these and

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80 P 6 5 9 7 DE -5- VPA

3 shows a view from above of a contact spring inserted into a contact spring strip made of plastic, with a strip housing shown in section.
5

In detail, it can be seen from the figures that the Flat material existing contact spring has a U-shaped base part 2,. its Ü-leg 30,31 at right angles to the direction of insertion of a contact knife or .10; Contact pin, which or which with the contact spring should be connected, are directed.

The two U-legs 30, 31 of the base part 2 are unequal long and the longer U-leg 30 goes in the direction of insertion of a contact knife or contact pin into a contact spring leg designed as a rigid plate 3a, the width of which corresponds to the length of the U-leg 30 corresponds. In order to do this without taking into account .20 at the transition to the crosspiece 41 of the base part 2 curved U-legs 30, the rigid plate 3a to be able to train completely flat and the plate extends over the entire width, through the length of the U-leg 30 is intended to extend, a cutout 35 is between the base part 2 and the plate 3a provided, which separates the curved region of the U-leg 30 from the plate 3a.

Opposite to the plate 3 a, the U-leg 30 has two contact cutting edges 16 which have a Limit contact slot 17, in which a wire-shaped conductor with a course directed transversely to slot 17 is ; , can be pressed. The contact cutting edges lie down 16 resiliently to the conductor and connect it to the contact spring. The cross piece 41 of the base part

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is on the side of the pair of contact blades 16, that is on the side facing away from the contact spring legs, designed to be wider than the shorter U-leg 31 · Mit This widened cross-piece 41 can be the contact spring in the insertion direction on one of the contact spring strip cavities Closing cover are supported, after the insertion of the contact springs with the contact spring strip is connected.

. 10 The other shorter U-leg 31 of the base part 2 is in one piece with a resilient Κοητ

j, clock spring leg 3b, the width of which is less than half the width of the plate 3a. In addition, the contact spring leg 3b is approximately in the middle of the xn;

■ '15 plate 3a arranged.

At its free end 32, the contact spring leg 3b has a contact spring leg 3b which widens on one side Approach 34, which runs opposite to the U-leg 31, but not up to the edge of the rigid Plate 3a is enough.

In this way, there is an over on the side of the contact spring leg 3b facing away from the shoulder 34 , 25 this contact spring leg laterally protruding portion 38 of the plate 3a. This one outside of the projection of the contact spring leg 3b on the plate 3a lying portion of the plate 3a is at the free end 36 of the plate 3a through an incision 37 of a opposite to the approach 34 of the contact spring leg 3b lying subregion 39 of the plate 3a separated. on in this way, the free end 36 of the sub-area 39 can move in the direction of the free end 32 of the contact spring leg 3b are bent and therefore together with this also arc-shaped curved free end 32 den

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Form contact spring contact 4, in the for the purpose of Establishing an electrical connection between a contact blade or contact pin and the contact spring the contact blade or the contact pin is inserted.

The incision 37 also makes it possible to make the partial area 38 of the contact spring leg 3a completely flat to run, so that this in a suitably adapted housing pocket (Pig. 3) 42 of the -, contact spring strip 43 can be inserted. Lug-like projections 40 provided in sub-area 38

press themselves into the plastic compound of the strip 43 "" and thus fix the contact spring inserted into the strip housing so that it cannot fall out of the housing again. The pocket 42 is upward, i.e. in FIG toward the viewer, and sealed so that dadurch'.beim insertion of the con-.;, clock spring in an associated cavity of the contact spring strip with the contact spring limbs 3a and 3b forward, a stopper is formed, of the depth of insertion of the contact spring against the insertion of a Contact blade or contact pin in the contact spring and thereby also supports the contact spring when a single conductor is pressed into the contact; slot 17. Since the resilient contact spring limb 3b does not protrude as far up as the rigid plate 3a, the resilient limb 3b remains always movable, in other words, digging of the free end 32 of the resilient leg 3b into the plastic

The mass of the contact spring strip is thus reliably prevented.

provided for forming the pocket 42 between the rigid plate 3a and the resilient leg 3b

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Pocket wall 44 (FIG. 3) advantageously serves both for pre-centering and pre-opening of the contact spring leg 3b, which is supported on this wall 44. In this way it is necessary to insert a contact knife or Contact pin required force is reduced and the risk of sticking behind, i.e. missing the Space between the rigid plate 3a and contact spring legs 3b, by a contact knife or a Contact pin significantly reduced.

As shown in particular in FIG. 3, the U-shaped base part forms together with that formed as a rigid plate Contact spring leg 3a a rigid part of the contact spring which is enclosed by the walls of the strip housing, which fully ensures the operationally reliable position of the contact spring in the cavity of the strip housing 43 facing it guaranteed.

• From Fig. 1 it can be seen that the contact slot 17. for receiving a single conductor is transversely offset with respect to the contact spring contact 4 formed by the sub-area 39 and the contact spring leg 3b. This transverse offset, which is, for example, a quarter of the grid spacing of the contact, contact pins or contact blades from each other, which are to be brought into connection with the contact springs of the bar, makes it possible that in each case a single conductor of a ribbon cable only from one contact slot 17, that is is detected only by a contact spring when the contact springs of the one row with vertausch- opposite the contact springs of the other row ¹ th Kontaktfedersühenkeln 3a, Jo arranging for two-tier arrangement of the contact springs in the strip housing, it being understood that the cavities for receiving the contact

springs must be designed in a corresponding manner.

5 claims
3 figures

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List of reference symbols

.2 basic part

3a rigid plate

3b resilient contact spring leg

4 spring contact

16 contact cutting edges

17 Contact slot of the contact blades

30 longer U-legs

31 shorter U-legs

32 free end of 3h

33 free end of 31

34 Approach 3b

35 free cut in 3a

36 free end of 3a

37 incision in 3a

38 flat part of FIG. 3a

39 partial area of-3a bent at the end

40 - wart-like protrusions in

41 Cross or connecting piece of 30 and

42 pocket for

43 bar

44 pocket wall

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Claims (5)

• · he «- * r η t -10- VPA Claims P 6 5 9 7 DE Contact spring for ribbon cable connection with a U-shaped base part and two contact spring legs which protrude at right angles from the U-legs of the base part and jointly form a contact spring contact for a contact pin or a contact blade, which are inserted into a channel-like cavity of a contact spring strip with the base part directed transversely to the course of the cavity and with the contact spring leg cannot be used in advance and with one of the two U-legs of the base part protruding from the contact spring legs and protruding from one of the two U-legs of the base part, an insulation displacement contact for 'a wire-shaped conductor forming contact blade pair according to patent 26 07 693, thereby characterized in that the U-legs (30,31) of the base part (2) are of unequal length, that! 'the contact spring leg protruding from the longer U-leg (30) as a rigid plate (3a) with one of the' length of the U-leg (30) corresponding width is formed and that the resilient contact spring leg (3b) protruding from the shorter Ü leg (31) ι has a width which is less than half the width \ of the rigid plate (3a), that the resilient contact spring leg (3b) is approximately in the center of the rigid plate (3a) is arranged, and at its free end (32) with one of the free end (33) of the U-legs (30,31) away - '■ -directed, opposite the edge of the rigid plate (3a) , but recessed, the contact spring leg (3b). has one-sided broadening approach (34), 130049/0171 -11- VPA 80P6597DE 2. Contact spring according to claim 1, characterized in that that between the part of the longer U-leg (30) that is curved at the root and the rigid plate (3a) is provided with a cutout (35). 3. Contact spring according to claim 1 or 2, characterized in that the rigid plate (3a) at its free end (36) an incision (37) for separating a flat, substantially outside of the ..Projection of the resilient contact spring leg (3b) on the rigid plate (3a) lying sub-area (38) and one with the resilient contact spring leg (3b) cooperating, end in the direction of this curved, other sub-area (39). 4. Contact spring according to one of the preceding claims, characterized in that the ■ - flat part (38) of the rigid plate with wafer-like Projections (40) is provided. 5. Contact spring according to claim 1, characterized in that the contact slot (17) which is bordered by the contact cutting edges (16) toe and which forms the insulation displacement contact (17) opposite the contact spring contact formed by the contact spring legs (3a, 3b) ( 4) is transversely offset. 130049/0171