DE2501437A1 - ELECTRICAL TERMINAL AND METHOD OF MANUFACTURING IT - Google Patents

Description

Dr. phil. G. B. HAGEN Dipl-Phy «. W. KALKOFF

MUNICH 71 (Solin)
Franz-Hals-Strasse 21
Tel. (0811) 796213

AMP 3449 Munich, January 7, 1975

NS

AMP Incorporated
Eisenhower Boulevard Harrisburg, Pa. (V. St. A.)

Electrical connection terminal and process for making same

■ Priority: Jan. 18, 1974; V.St.A .; No. 434 729

The invention relates to an electrical connection terminal and a method for its production.

A previously developed electrical connection terminal has a tubular section, which extends in the axial direction Has seam, the opposite edges of which are spaced from one another along a first longitudinal seam section to form a lead wire receiving slot with an insertion opening at one end through which an insulated lead wire is transverse to its axis can be pressed into the slot so that the slot edges penetrate the insulation and establish an electrical connection make with the ladder. · _

A disadvantage of this connector is that it is more reliable in operation Way can only accommodate lead wires within a relatively small diameter range.

509830/0697

Bayerische Vereinsbank Munich 823101 Postscheck 54782

250U37

AMP 3449 _ 2 -

The connecting terminal according to the invention is characterized in that along a second, n longitudinal seam section remote from the insertion opening the seam edges butt against each other and the pipe wall is resiliently pretensioned, whereby the seam edges against each other to be printed.

The side walls of the terminal are pretensioned during manufacture so that the seam edges are tensioned in mutual contact are. So if a lead wire, the diameter of which is insufficient to overcome the bias, into the slot is pressed in, the slot width does not increase significantly, and the terminal shows essentially rigid characteristics. However, if a larger diameter lead wire is pushed into the slot, the bias is overcome, and the connection terminal shows spring properties. These double characteristics allow the terminal to accept lead wires within a much larger diameter range, than is possible with the connector that has already been developed.

The method according to the invention for producing the connecting terminal, in which a flat, substantially square blank is punched, which has first and second parallel side edges, the second side edges extend laterally beyond the first side edges, and in which the blank is centered between the side edges and the axis parallel thereto is bent into a U-shaped body, is characterized by bending the Side walls of the U-shaped body towards one another and press against one another the second side edges by compression to bias the second side edges into contact with each other.

509830/0697

AMP 3449 - 3 -

An embodiment of the invention is set out below Hand of the drawing explained in more detail. Show it:

Fig. 1 is a perspective view of the connector;

Fig. 2 is a plan view of a blank from which the Terminal is molded;

Fig. 3 is a perspective view of the terminal which receives a small diameter lead wire ;

Fig. 4 is a perspective view of the connector which takes a lead wire of larger diameter; and

Fig. 5-8 Cross-sections through mold halves shown in different manufacturing phases of the connector be used.

A connection terminal 2 is essentially tubular and has a flat rear wall 3 from which opposite side walls 4 extend which are curved inward at their free ends to form an axially extending seam between them. The edges of the seam abut one another in a central section 8 "and are spaced from one another on each side of the central section to form conductor receiving slots 7. The seam edges diverge towards each axial end of the connecting terminal to form wire insertion openings 8 through the conductor wires across their axes can be pressed into the slots 7, so that the slot edges penetrate the insulation of the lead wires and a
Establish electrical connection with the conductor core.

509830/0697

AMP 3449 - 4 -

The side walls are formed with transverse shear lines 9, which cut the seam section 6 at one end and mechanically separate the two conductor receiving slots 7 from one another separate to form separate spring systems (see US patent application 347 956). The other ends of each shear line run to punched holes 18. The back wall is on Points which are aligned with the respective insertion openings 8 are formed with notches 13. The edges of the notches cut lead wires as they are inserted into the slots and also help to secure the lead wires with the Align slots.

The side walls of the terminal are prestressed during the manufacture to be explained, so that the seam edges are tense in mutual contact. Therefore, a considerable force must be applied to open the section 6 of the seam to be brought. As a result, if a lead wire that is not large enough to overcome the bias, is pushed into a slot 7, the slot width does not increase significantly, and the terminal shows substantially rigid characteristics, as shown in FIG. 3. However, if a lead wire with a larger diameter is inserted into a slot 7 is pressed, the preload is overcome, and the terminal shows spring characteristics with a relatively low spring rate.

Through this double characteristic, the terminal can lead wires take up within a wider diameter and hardness range than with many already developed connection terminals, z. B. that according to US patent application 347 956 is possible.

509830/0697

250U37

AMP 3449 - 5 -

The terminal is formed from a blank 20 made of Sheet metal is punched and has edges 16, 17 and 18, which later form the sections 6, 7 and the insertion openings 8 of the Form a seam. The notch 19 is the precursor of the notch 13, and the shear lines 9 'are the precursors of the Shear lines 9.

The blank is on a first mold half 24 or Die laid, which has a recess 25 with parallel sides, which form a substantially semi-cylindrical base 26 converge. Then a complementary mold half is made 27 'or patrix downwards towards the blank moved to form a U-shaped, partially shaped body with parallel side walls and a semi-cylindrical rear wall 29

The partially formed body 31 is then removed from the mold half 24 and placed on a mandrel 32 with a flat one Arranged top 33, a semi-cylindrical bottom 34 and parallel sides. The partially molded body will so arranged around the mandrel that the top 33 of the rear wall 29 is opposite. The thorn works with a second Mold half 35 or die together, which has a recess 36, which is essentially the same as the recess in the mold half 24, although there may be dimensional differences between the two recesses. In one. In the final forming step, a mold half 37 or male mold and the mandrel 32 are moved out of the position according to FIG. 7 in the position ' 8 moved downwards, whereby the fr, one ends of the side walls are bent inwardly, while the mold half 37 flatten the back wall of the blank on the top ■ of the mandrel.

509830/0 6 97

250U37

AMP 3449 - 6 -

During this final forming step, the side walls of the partially formed Body pressed together in the tool recess and enclosed between this and the mandrel. This results in a strong cold deformation of the side walls, the inner one Tensions generated in the side walls, which biases the edges of the seam in section 6 against each other, so that after Removal of the connector from the mold does not result in the side walls springing back.

It should be noted that the tool parts shown in Figs. 5-8 are normally parts of a sequential forming tool, in which the orientation of the mold according to FIGS. 7 and 8 would be reversed, so that the mold half 35 is arranged at the top would be to avoid turning the partially formed.n body 31 between the two 'stations.

Since the separation of the edges 17, which form the conductor receiving slot 17, precisely defined, when the free ends of the Walls 4 are formed towards one another, an exact tolerance of the width of the slot 7 can be maintained without a a precisely sized slot punch is needed, as would be the case if the slot were only simply made in a blank would be punched.

Patent claims:

30/069

Claims (4)

250H37 AMP 3449 - f - F a t en t talk l.j electrical connection terminal with a tubular section, which has a seam running in the axial direction, the opposite edges of which along a first seam longitudinal section are spaced apart to form a lead wire receiving slot an insertion opening at one end through which an insulated conductor wire transversely to its axis into the slot can be depressed so that the slot edges penetrate the insulation and establish an electrical connection with the Manufacture conductor core, characterized in that along a second longitudinal seam section (6) far from the insertion opening (8), the seam edges abut and the pipe wall (4) is resiliently pretensioned is, whereby the seam edges are printed towards each other. 2. Terminal according to claim 1,
characterized in that it has two ^{conductor receiving slots (7, 7 f} ) with insertion openings (8, 8 ¹ ) at opposite axial ends of the seam, and that the tube walls (4) have transverse slots or shear lines (9) which form the second section ( 6) cut the seam and divide the pipe into two mechanically separated ladder mounting parts. 3. A method for producing an electrical connection terminal, in which sheet metal is a flat, substantially square blank is punched, which has first and second parallel side edges, the second Side edges extend laterally beyond the first side edges, and in which the blank is centered around one 509830/0697 250H37 AMP 3449 £ - $ - between the side edges and the axis running parallel to them is bent into a U-shaped body, characterized by bending the side walls (4) of the U-shaped body (31) towards one another and pressing the second one against one another Side edges (6) by compression to bias the second side edges (6) into mutual contact. 4. The method according to claim 3, characterized in that the U-shaped body (31) is arranged around a mandrel (32) while the side walls (4) are pressed together in a molding tool (35) by a male mold (37) will. 509830/0697 Blank page