JPH0371941A - Manufacture of contact element for foil connector and contact element therefor - Google Patents

Abstract

PURPOSE: To pressurize contact projections with an energizing tensile force with each other by punching a contact element for wheel contactor provided with contact projections out of a C shaped spring and executing press die working so that a curved surface of the spring may be more elongated at the outer side edge part than at the inner side edge. CONSTITUTION: A contact element 1 is formed from a C shaped spring and a plate partially punched. Fundamentary parts of the contact element 1 are a web 2, body parts 3, 4, contact projections 7 and supporting parts 8, 9. The contact projections 7 are at a distance with each other. Next, working areas 24-27 in the press die working are the parts with a width (e) which is >=2/3 of a width B of an outer side edge 33 of the spring 23. The working areas 24-27 are continuously worked in a order of 24-25-26-27 or in a reverse order. Then, the two contact projects 7 are pressurized with each other with an energizing force.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for manufacturing a contact element for a foil connector consisting of a C-shaped spring of flat material, in particular sheet metal, extending in the plane of the spring, and to the contact element.

(Prior Art) In order to compress the foil, such a contact element requires an inherent tension in a C-shaped spring acting on both free ends with contact surfaces facing each other in order to produce the desired biasing tension. becomes.

In the method according to West German Publication No. 3633799,
In order to provide such a biasing tension to the contact element, the body of the spring is curved after stamping. Pressing the springs together by pressure on the body parallel to the plane of the springs is not only time consuming but also difficult, and also difficult to bend, and the contact element that contacts the element is bent and then undesired. The contact element becomes unusable due to uniform biasing tensions or the barrel being relatively easy to over-bend. Moreover, the contact element during bending is only supported on expensive support means, which results in the production method problems mentioned above.

Such problems are overcome by the compact structure provided by contact elements of the present type.

OBJECTS OF THE INVENTION A fundamental problem of the invention is to simplify the generation of a biasing tension in a contact element.

(Means for solving problems) This problem is solved by the features of claims 1 and 10.

(Operation and Effects of the Invention) In the method according to the present invention, both bodies of the spring are urged toward each other by the compression according to the present invention. Crushing is an easy method to carry out, in which the contact element can rest with its surface on a cuffing support, so that it can be easily supported. Additionally, compression allows the biasing tension to be better maintained and its desired tolerances to be adjusted more easily. Also, depending on the strength of the cutting, desired shape changes can be achieved easily and accurately.

Further advantages resulting from the contact element and method according to the invention of simplifying the method and its construction, allowing economical production and good adjustment of the desired tolerances are set out in the dependent claims. It is described in.

(Example) The present invention will be described in detail below with reference to the drawings and preferred examples.

The contact element (1) is formed by a C-shaped spring and consists of a partially stamped sheet metal;
The plate extends along the plane of the shape. The contact element (1) does not exhibit any curvature of this plate surface. This is a problem with so-called flat springs.

The basic parts of the spring contact element (1) are a semicircularly curved web (2), a body (3,
4), contact protrusions (7) provided on opposing sides, ie, inside, of the free ends (5, 6) of the body, and support portions (8, 9) provided on opposing sides, ie, outside, spaced apart from each other; It is.

The bodies (3, 4) extend to meet their free ends (5, 6), but along the way the web (2) forms a droplet shape with the bodies (3, 4). It is somewhat depressed. The contact protrusion (7) is formed by a round protrusion.

The solid line in FIG. 1 shows the contact element (1) in the open state, in which the contact projections (7) are at a distance from each other and the contact element (1) is tensioned. The dotted line in Figure 1 shows the contact element (1) in its initial state, in which the contact projections (7) touch each other and are urged toward each other due to the inherent tension of the contact element (1). ing.

Conventional foil connectors consist of a two-part plastic casing, one of which may be a casing cover. The interior of the case is provided with partition walls parallel to its side walls and spaced apart from each other to form a narrow compartment, in which the contact element (1) is connected to its mounting parts (8, 9) and its mounting parts (8, 9). It is taken into each case together with the body (3, 4). Contact element in foil connector (1
) arrangement and support according to West German Shinma Publication No. 333679.
It can be obtained from the arrangement and examples of No. 9, and the upper body (
3) together with its contact projection (7) is bent upwards or outwards about its axis in order to open the contact element (1). This curvature occurs in the elastically curved region of the contact element (1), such that after being removed from the cover part, the body (3) returns to its initial position, while the force bar part also returns to its original position. .

Connections by means of fittings (8°9) are also formed within each case. The upper attachment part (8) provided on the body part (3) has a substantially vertical hook part (11) and a substantially horizontal rebound hook part (12).
), the latter of which is designed to engage the counter bearing of the cover part. To avoid repetition, West German Publication No. 3336799
Reference should be made to the specification of No.

The mounting part (9) is connected to the contact element (1) below the lower body part (4).
bridge strap (13) extending in the plane (E) of
up to its upper edge, preferably uniformly spaced (b
), following the shape of the body (4) and web (2),
This gives the bridge strap (13) a corresponding concave shape. The bridge strap (13) is laterally connected to the main retention strap (14), which strap (14) is attached to the free end (6) of the torso (4).
It extends downwardly from and is provided at its downward end with two narrow fastening projections (15) and a starting bevel (16)', which are continuous and arrow-shaped. At the end of the bridge strap (13) remote from the main retention strap (14), a retention strap (17) extends downwardly, the free end of which has two narrow fastening projections. (18) and the starting bevel (1
9), which is similarly arrow-shaped. From around the center of the bridge strap (13),
Two mounting aids (21, 22) extend downwards in the plane (E) of the contact element (1), at least one of the mounting aids extending in such a way that it can form a joint leg. When attached to the case of the foil connector, the main mounting strap (14) and the secondary mounting strap (I7), like the mounting auxiliary pieces (21, 22), fit into the insertion slits of each case with corresponding shapes and sizes. engagement, in the process of which the locking projections (15, 18) snap into place.

The already mentioned specific tension of the contact element (1) is the same as that of the web (2
) and the body (3, 4) of the bow (23).
0) by continuous stamping towards the outer edge.

Thereby, the stamped outer border area of the arch (23) is elongated due to material deformation, resulting in a C-shaped "deformation". Embossing can take place in one and/or both regions of the body (3°4) and/or in the region of the web (2).

If only one of the body parts (3, 4) is stamped,
The other, unprocessed body (3, 4) remains unchanged, so that the curvature of the body (3, 4) is asymmetrical. Conversely, if both barrels (3, 4) or regions of the web (2) are stamped, especially their apexes, this will give the arch (23) a symmetrical shape change.

In the embodiment of the present invention, there are four pressing die processing locations (24 to 2
7) is given and is approximately evenly distributed over the entire curve of the web (2). There are two outer machining points (24°27) tangent to the vertical transverse plane (E1) passing through the base of the body (3, 4), and in this arrangement the approximately equally sized machining points are approximately 30° apart. Each extends at an angle that exceeds the angle range (W), and each machining location (2
4 to 27), an angular range (W1) of about 20° occurs. (28) shows a stamping part that can be placed on the outer boundary area of the lower body part (4) as the above-mentioned modified example.

As clearly shown in Figures 2 and 3, the stamped surface (
31) are each concave and round, that is,
The axes run approximately radially in such a way that, at the processing point, a fodder-like round depression is created which extends transversely and radially across the web (2). Here, the machined surface (31) is inclined outwards, i.e. the surface (20) or the arch (23).
) or the wide sides of the web (2) containing them, forming an acute angle (W2) of preferably about 12°.

Continuous stamping in the area of the outer edge (33) can be achieved by means of a normal section with outwardly branching wings (29, 30). When formed in this way, a similarly inclined and preferably roundly curved machining surface (31) is obtained, from which a triangular shaped machining surface arises.
The two corners of the triangle are the outer edges (33) of the arch (23)
The third corner points to the center of curvature of the web (2). The processing points (24-28) each preferably extend over two-thirds or more of the substantially constant width (B) of the arch (23).

The degree of this depth is determined by the width (
Indicated by e). Maximum depth of pressure cut points (24-28) (
1) is approximately one third of the thickness (d) of the web (2). Machining points (24 to 27) in the area of the curved part (2)
In the above arrangement, the center lines indicated by (34) of the machined surfaces (31) are at an equally large angle of approximately 50° (W3).
) is formed. Embossing at this angle has proven particularly advantageous.

It is preferable that the press molding (24 to 27) be performed continuously rather than simultaneously. Multiple processing points (24-27
), there is a risk that the desired tension in the arch (23) will be nullified due to the tightening of the contact element (1) during processing. Therefore, continuous processing is more advantageous. Preferably, the pressing mold processing area (24 to 2
7) is 24-25-26-27 or 2726-25
-24 is processed in a continuous order.

When the contact element (1) is punched out from a sheet metal and subjected to back-up processing, at the connection part, the solid line in Fig. 1 can represent not only the open shape of the contact element (1) but also its processed shape. . After machining, the two contact projections (7) preferably remain in contact with each other, in any case
No.! As shown, they are pressed together with a certain biasing tension.

In the stamping process, as shown in FIG. 4, the free ends (5, 6) of the arch (23) are curved across the plane (E) until they move parallel to the plane (E) and pass each other. It is preferable that this occurs at a position where During the machining of the body (3, 4) or while the contact protrusions (7) move towards each other, in the process, due to the intensity of the machining, the contact protrusions (7) overlap each other and remain overlapped in a certain position. There are up to Contact element (
1) or for attaching it to the foil connector, the free ends (5, 6) are pulled apart slightly to reach the plane (E), so that the opposing biasing tensions in the plane (E) occurs.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an enlarged side view of a contact element for a foil connector for a printed circuit manufactured and constructed according to the present invention;
The figure is a sectional view taken along the line I[-II in Figure 1, and Figure 3 is a sectional view taken along the right arrow X.
FIG. 4 is a left side view of the contact element in a particular geometrical position. (1)...Contact element, (7)...Contact protrusion, (20)...Spring surface, (23)...
...Spring, (24) to (27)...Press mold processing parts. 266-1

Claims (1)

[Claims] 1. A method for manufacturing a C-spring-shaped contact element (1) with contact projections (7) facing each other or slightly spaced apart from each other for a foil connector. hand,
The spring (23) is stamped out of a flat material, in particular sheet metal, extending over the spring surface and the contact element (1
) is curved, the contact element (1)
characterized in that, due to the curvature of the spring (23), the surface (20) of the spring (23) is pressed after being stamped in such a way that it is stretched more in the boundary area of the outer edge than in the boundary area of the inner edge. How to do it. 2. Method according to claim 1, characterized in that the outer border area of the surface (20) of the spring (23) is stamped. 3. The surface (20) is connected to the body (3, 4) of the spring (23).
3. Process according to claim 1 or 2, characterized in that one or both regions of the web (2) and/or the web (2) are stamped. 4. Outer edge (3) of surface (20) for stamping
3) is pressed against the surface (20) of the spring (23), with a working surface (31) inclined towards the spring and preferably curved convexly in the longitudinal direction of the spring; The method according to any one of claims 1 to 3, characterized in that: 5. A method according to any one of claims 1 to 4, characterized in that a plurality of stamping locations (24 to 27) are preferably processed one after the other. 6. The stamping parts are arranged in the order (2) along the spring (23).
4-25-26-27 or 27-26-25-24)
The method according to claim 5, characterized in that the method is processed by: 7. First, at least one, preferably two, basic stamping operations are carried out, and then at least one for fine-tuning.
6. A method according to claim 4, characterized in that finishing stamping is carried out twice, preferably twice. 8. Spaced apart across the plane (E) of the spring (23) until the free ends (5, 6) of said spring (23) are adjacent to each other with respect to the plane (E) of the spring (23) before stamping. 8. A method according to claim 1, characterized in that the method is curved and its rearward processing is carried out. 9. After stamping, contact element to foil connector (1)
9. Method according to claim 8, characterized in that during the installation of the spring (23), the free ends (5, 6) of the spring (23) are pulled apart and set back on the displacement surface (E) of the spring (23). 10. Contact elements (1) for foil connectors consisting of C-shaped springs of flat material, in particular of sheet metal, extending in the plane of the spring, at the free ends of their bodies, facing each other and in the initial position of the spring with contacting or slightly spaced contact projections (7) and springs (23);
at least one surface (20) of is provided with at least one stamped area (24-27) that stretches the spring (23) more in the boundary area of the outer edge (33) than in the inner edge; A contact element characterized by: 11. The pressing mold processing parts (24 to 27) are shaped like springs (2
11. Contact element according to claim 10, characterized in that it is arranged in the outer boundary region of 3). 12. The stamping parts (24 to 27) applied from the outer edge (33) of the spring (23) correspond to the width (B) of the spring (23).
) extends over a part of the
12. The contact element according to item 0 or 11. 13. The width (e) of the stamped parts (24 to 27) extending across the longitudinal direction of the spring (23) corresponds to about two-thirds of the width (B) of the spring (23). 13. A contact element according to claim 12. 14. Machining surface (31
) is inclined with respect to the outer edge (33) of the spring (23) and the plane (E) or surface (2) of the spring (23)
14. Contact element according to any of claims 10 to 13, characterized in that it encompasses an acute angle (W1) of preferably about 12[deg.] with respect to 0). 15. Wings (29, 3) of the machined surface (31) of the stamping part
0) diverges towards the outer edge (33) of the spring (23) and preferably encompasses an angle (W4) of approximately 90°. contact elements. 16. The contact element according to claim 15, characterized in that the processed surface (31) of the stamping part is triangular. 17. Machining surface (3) of the pressing mold processing location (24-27)
17. The contact according to any one of claims 10 to 16, characterized in that 1) is rounded and concave so as to have a somewhat cylindrical cross-sectional shape so that the axis runs substantially across the spring (23). element. 18. The pressing mold processing parts (24 to 27) are the web (2
), and preferably the spring (23)
18. Contact element according to any of claims 10 to 17, characterized in that the web (2) is approximately semicircularly rounded. 19. Plural, preferably 4 pressing mold processing locations (24 to
19. Contact element according to claim 1, characterized in that the contact elements 27) are arranged successively along the spring (23) at equal or different spacing from one another. 20. The first and last stamping parts (24, 27) are
20. Contact element according to claim 19, characterized in that it is tangential to a cross section (E1) passing through the origin of the body (3, 4). 21. Contact element according to claim 19 or 20, characterized in that the stamping points (24-27) each extend over an angular range of approximately 30[deg.]. 22. The depth (t) of the press mold processing parts (24 to 27) is
Contact element according to any of claims 10 to 21, characterized in that it corresponds to approximately one-third of the thickness (d) of the spring (23). 23. Contact element according to any of claims 10 to 22, characterized in that both sides (26) of the spring (23) are stamped.