FI95180C - Contact-providing terminal for connecting wires in electrical appliances - Google Patents

Description

, 95180

A contacting pressing member for connecting the wires of electrical equipment

The invention relates to a contact press for connecting the wires of electrical devices according to the preamble of claim 1.

Several different variations of contact press members are known. In this connection, mention must be made in particular of the press according to GB-1 243 938. This press is complex in construction and requires numerous bending operations and cumbersome stampings during manufacture. In addition, its manufacture is difficult because the press or its active part must remain within strict tolerances for the press to operate reliably, and on the other hand because the numerous bending operations required require large tolerances, which requires a great deal of effort and precise tools to maintain tolerances.

15

The press according to DE-1 240 573 must also be mentioned in this connection. It consists of several details that still require their own housing for assembly, so that not only its manufacture but also its assembly is cumbersome.

Although the press according to EP-246199 has in principle a simple structure, the wires to be connected can only be inserted from opposite sides, not to mention that a separate attachment is required to later disconnect the wires from the press, forming part of the housing and requiring complex injection molds. With regard to the connection possibilities of the cables, the latter 25 structures have to be compared with DE-OS 1 285 589, which, however, is cumbersome in structure, as it has a part to be stamped from the base body, which must be form-locked to be connected to other parts stamped from the base body. This requires complex tools.

U.S. Pat. No. 4,221,456 discloses a different type of press. In it are the bare ends of the wires,; * between flat sheet metal strips so that this clamp does not provide assurance that the wires will not come loose under tensile stress from the clamp.

The object of the invention is to provide a press which can be manufactured only by simple stamping and bending operations and which is thus simple and inexpensive to manufacture and, in addition, does not require any constructive measures to connect the wires of the electrical device or the supply line in a contacting manner. In this case, the circumferential length of the blank must be as small as possible without, however, compromising the reliability of the press to be manufactured 95180 2, in which case the energy required for stamping can be saved. The bending lines must also be short for this reason. More generally, the resistance of the material must also remain low, as must the number of bending operations, in order to achieve strict tolerances in the manufacture of the press. According to the invention, this is achieved by measures according to the characterizing part of claim 1. The subclaims set out the preferred embodiments in more detail. In the drawings: Figure 1 shows a top view of a ready-to-use press; Figure 2 is a side view; Figure 3 is a rear view; Figure 4 is a front view; Fig. 5 is a plan view of the stamped blank from which the press of Figs. 1-4 is made; Fig. 6 is a plan view of an embodiment; Fig. 7 is a plan view of the stamped blank from which the press of Fig. 6 is made; and Fig. 8 shows the presses of Figs. 1-8 ready for export to a housing acting as a press holder.

20

Figure 5 shows a blank stamped from an electrically conductive sheet, from which the presses 1-4 are made by bending. This blank has a substantially square base plate 1. The opposite sides of the base plate 1 have edges, i.e. edges 2, 3, which extend to a height H on the other side of the plate 1. In addition, three tongues 4, 5 and 6 are stamped from the base plate 1, whereby the boundary edge 7 of the middle tongue 4 is stepped. The middle lip 4 in the height H of approximately corresponds to the lateral edges 2, 3, the height H, which is a rear-side end part obliquely downward boundary edge 8, wherein the one remaining height of the remainder of h 'is equal to or slightly greater than the rear-sided edge 9 of height h ". The bottom plate one end 10 linked to the a protrusion 11, 30 terminating in a connecting member 12 comprising a central opening 17. This rectangular connecting member 12 is flanked in the blank (Fig. 5) by the protruding portions 15 of the edges 2 and 3. Fig. 5 shows the press flush with the bending lines 13, 14 and 16 and 18 is shown in dashed lines.

This sheet metal stamped blank according to Figure 5 above is now formed by bending, in which the stiffening of the bends is not relevant to the invention. Along the bending lines 13, the projections 15 of the edges 2, 3 are bent into a trough-like shape. Along the lines 14, the edges 2, 3 and 9 are bent upwards from the drawing plane so that they form IK IK customs li! t a 3 95180 form a substantially right angle with the drawing plane. The projections 15 of the edges 2, 3 are further bent towards each other so that their ends enter the central region of the base plate 1. The middle tongue 4 and the tongues 5 and 6 on its sides are likewise bent upwards along the line 16 and are also substantially perpendicular 5 to the base plate 1. The middle tongue 4 is further shaped wavy along lines 18. Finally, the connecting member 12 is further bent upwards into an open chute with a V-shaped cross-section, its axis being substantially parallel to the bending lines 14 of the side edges 2 and 3.

A press made by bending the blank of Figure 5 in this way is shown in different views in Figures 1-4. The edges 2 and 3 rising on opposite sides of the substantially rectangular base plate 1 are at an angle of about 90 ° to the drawing plane and the central tongue 4, which is substantially parallel to the edges 2 and 3, rests against the parts 15 of the edges 2 and 3 facing the central area of the base plate 1. The free ends of the projections 15 then rest on the central tongue 4 and form an acute angle with it in the direction of the end 10. The tongue 4 is corrugated in part in length and the ends of the tongues 15 resting on the crests of the wave, most preferably under low pressure.

It can further be seen from Figure 1 that the tongues 5 and 6 are in the areas 20 of the base plate 1 bounded by the edges 2 and 3, opposite parts 15 and the central tongue 4. They are at some distance from the parts 15 so that these parts can bend in the wire to be connected. on export, but however, the tabs determine the angle of deflection.

Figure 2 shows the upper edge 21 of the edges 2 and 3, the rear edge 9 and the middle tongue 25 4. Figure 8 is a perspective view of a housing 19 acting as a press holder, made of e.g. plastic and intended to hold the end of a choke coil or the winding end of a small transformer. This housing 19, suitably arranged in connection with such an electrical appliance, has box-like pockets 20, open on one side, into which the press according to Figures 1 to 4 is inserted, as shown in Figure 8. The oblique boundary edge 8 of the edges 2 and 3 facilitates this si-. the weather is exported and the clamp inserted in the pocket 20 is fixed in place by means of a wedge-shaped cam of the middle tongue 4 rising towards the upper edge 21 of the edges 2, 3.

This fastening cam is formed by the wedge-shaped boundary edge 7 of the tongue 4.

35 Not shown, the end of the cable coming from the winding of the electric device is attached to the connecting member 12. The connecting cable is inserted between the middle tongue 4 and the second tongue 15, this tongue 15 bending against either the tongue 5 or 6, which limits the bending movement. tongue and thus lose its 4 95180 elasticity. When the end of the cable is inserted, it rests on the other hand against the tongue 4 and presses against it due to the spring force of the tongue 15 and locks in place. As a rule, the ends of the cable to be connected to both sides of the tongue 4 are inserted. In Figure 6, which will be described in more detail later, such a wire end is shown by a broken line as well as the position of the bent tongue.

Fig. 6 shows another embodiment, which differs from the above mainly in that different connection means are used here instead of the connecting member 12. The sheet-stamped blank on which the base of the press according to Fig. 6 is based is shown in Fig. 7. The end-side part of the base plate 1 is now divided by a central T-shaped notch 23 into two tongues 22 bent 90 ° relative to the base plate 1. at an angle, at the beginning of which these adjacent parts are further bent so as to form a V-shaped pattern on the base plate (Fig. 6). The bare end of the wire 15 from the winding of the electrical device to be connected is wound around the tongue 22, after which the two tongues forming said V-pattern are pressed together.

In the accompanying figures, the press is shown in a greatly enlarged size for clarity. In practice, the base plate is about 13 mm long and about 7 mm deep. The height H of the side edges is approx. 3 mm. It can be seen from the above that the press according to the invention is manufactured only during the stamping and bending work steps, that its installation in the housing acting as a press holder does not require any special tools and that the connection of the wires to be connected does not require special tools. For a pulp product such as this press, these have significant and substantial advantages. The manufacture of the press, its installation and also its connection can be easily automated.

Claims (10)

1. Contact-providing terminal for connecting trees of electrical appliances, said terminal having a substantially square ground plate (1) with a front edge (10), an edge (9) forming a back side and two opposing sides, the edges of the opposing sides being (2, 3) with projecting portions (15) from the leading edge (10) are bent about 90 ° with respect to the base of the base plate (1), the projecting portions (15) of the opposite side projecting and upwardly bending portions (15). further bent in a direction towards each other, and said clamp is made of a plaque blank of electrically conductive material by punching and bending, the middle region of the base plate (1) being punched a tongue (4), characterized in that it from the base plate ( 1) the middle region of the punched tongue (4) is bent upright and extends substantially parahdite with the opposing edges (2, 3) of the base plate (1), and that the tongue (4) lies between the portions (2, 3) of one another(15) adjacent free ends and touching them, the tongue (4) together with the edges (15) of the edges facing them (15) forming an acute angle with respect to the leading edge (10). 2. Contact-providing clamp according to Claim 1, characterized in that the tongue (14) * 5 is at least part of its length shaped in the form of a road, and that the free ends of the parts (15) facing each other rest against the road peaks in this cradle formation. 3. Contacting clamp according to claim 1, characterized in that on the base plate (1) the areas bounded by the side edges (2, 3), their opposite parts (15) and the tongue (4) located in the middle, a further tongue (5, 6) is punched and bent, and that these tongues (5, 6) are located adjacent the portions (15), but at a distance from them, so as to limit their bending when introducing trees which should be connected. 4. Contacting clamp according to claim 1, characterized in that the upper edge (7) of the tongue (4) located at the middle along at least a portion of its length lies above the upper edge (21) of the side edges (2) and slopes obliquely towards the trailing edge of the clamp. 5. Contacting clamp according to claim 1 or 4, characterized in that the edge which forms the rear edge (9) of the base plate is bent upwards. 6. Contact-providing clamp according to claim 1, characterized in that in the rear portion of the upwardly curved side edges (2, 3) there is a rear, downwardly inclined upper limiting edge (8). 25 • 4 • I Contacting clamp according to any one of claims 1-6, characterized in that a connecting means (12) with a protrusion (17) is arranged in the front end portion (10) of the base plate (1), preferably in line with the middle tongue (4). / or upright curved edges. 30 I 8. Contacting clamp according to claim 1, characterized in that the edge of the end face of the base plate (1) is bent upright and divided into two tongues (22) by means of a centrally located, T-shaped cutout (23), and that the first adjacent portions in the these tongues (22) are bent and these tongues are V-shaped and form a right angle to the base plate. 9. Contact-providing clamp according to any of claims 1-8, characterized in that it is placed on one side in an open ash-like plastic frame (19). 8 95180 Contacting clamp according to claim 5, characterized in that the height (h ") of the upwardly curved edge (9) on the back of the base plate (1) is less than the height (H) of the upwardly curved side edges (2, 3).