DK141145B - Connection terminal for de-insulation-free connection of electrical wires. - Google Patents

Description

(§) (11) PUBLICATION WRITING 1 / + 1145 DENMARK (Buint.ci.3_H ot r utu '(21) Application No. 4286 /? 0 (22) Filed on 20 Aug 1970 (23) Running Day 20. SUg. 1970 (44) The application submitted increase the publication requirement published on 21st January 1 980

DIRECTORATE OF

PATENT AND TRADE MARKET (30) Priority requested from it

Aug 21 1969, 1942643a DE

18th foot. 197Ο # 2007487a DE

Apr 24 1970/2020103, DE

(71) SIEMENS AKTIENGESELLSCHAFT, Berlin and Munich, 8 Munich 2, Wittels =

Tj ac repairs z 2, BE.

(72) Inventor: Walter Breustedt, 815 Holzkirchen, Wilhelm-KLess-StraBse 9, DE: Fritz Leifchelm, 8000 Muenchen 49, Engadiners tr as s e 30, DE: Adolf Adam, 8031 Alling, Hirtenstraese 40, DE.

(74) Authorized for the proceedings:

International Patent Bureau._ (54) Connection terminal for connection of electrical wiring.

BACKGROUND OF THE INVENTION 1. Field of the Invention The invention relates to a connection terminal for the free isolation of electrical wiring and with three tongues forming two adjacent terminal slots, which terminal consists of two superimposed and interconnected flat ribbon parts or plates.

Known terminal blocks of this kind are made of flat ribbon metal by punching. The choice of material for such clamps requires consideration of both the material properties and the thickness which significantly affect the clamping conditions, which considerations must lead to a compromise between the various requirements of such a clamp. For example, it is required, for example, that the spring properties of the material ensure an impeccable cutting of the conductor insulation and a clean abutment against the conductor itself, and the electrical conductivity and the constancy of the surface properties must be 2 U1U5 provided to such an impeccable and durable good electrical connection between conductor and pinch. Finally, the thickness of the material used for the spring properties also determines, for technical reasons, the width of the clamping slots, as the least possible width of a punched slit, as is known, depends on the thickness of the basic material.

It is therefore the object of the invention to satisfy these requirements and to provide a clamp of the kind in question which makes the said compromises superfluous.

This is achieved by a clamp which according to the invention is characterized in that the outer tongues are formed on a first, and the intermediate tongues lying on a second plate, and that the tongues are arranged and shaped so that the regions limiting the clamp slots, is in one plane.

Thus, in the clamp formed according to the invention, the clamping slots are defined by different structural parts which can be selected independently of their material properties as well as of thickness. The clamp can hereby be designed so that on one side of a clamping slit there is a material with good spring properties, while the other side is formed from a material with good electrical conductivity. Depending on the required strength conditions, the thickness of the parts defining the clamp slots can now be freely selected. Since the clamp slots are bounded by two mutually independent structural members, the slit width is now also completely independent of the thickness of the material used.

In the design of the clamp according to the invention, the parts of which can be easily produced by punching and bending, various possibilities exist. Thus, an embodiment of the invention is characterized in that the middle tongue is bent into the plane of the first plate. Thereby, the two outer tongues can be produced in a simple manner by punching a V or U-shaped recess in the first plate, while for example the tongue lying between these tongues is formed as a punched part on the second plate, which part may have a creasing in or perpendicular to the longitudinal direction of the second plate. However, it is also possible that the middle tongue is formed as a third band-shaped part or plate connected to the second plate, e.g. by welding. By placing these parts on top of one another, then the one who must be the middle tongue will lie in the space between the two outer tongues.

In order to facilitate the fitting of the clamp, it is desirable that the middle tongue of a part of the length is accommodated in one of the outermost tongues limited recess.

Said alignment can be done by means of perpendicular to the clamping slots lying on the middle tongue and / or the outer tongues.

Because the clamp according to the invention consists of two mutually independent plates, it is possible, in addition to the choice of a suitable material, that the second plate is at least partially wider than the first plate and forms three strokes, limiting the springing of the tongues on the first plate. Such estimates may, for example, be formed by rises in the side edges of the second plate ·

It has proven right to design the clamp slots so that they can be used for conductors of different dimensions. Thereby, when squeezing conductors whose diameter lies in an upper boundary region, there is a risk that the conductor may slip out of the slot by excessive spreading of the slit, especially when the clamp is subjected to shaking, such as . may occur in a conjoined connection field. Such a thing can be avoided by the clamping slots having a narrowing between the areas designated for receiving a conductor and their insertion opening, which areas exert a clamping effect on the joint. This narrowing, which is in the clamping slot itself, resists a movement of the squeezed conductors in the direction of the insertion opening, thus preventing the described adverse effect, which can already be achieved with a relatively small narrowing. In this connection, the extent of the constriction can be chosen completely freely for the desired function, since it does not have to be effective at the intersection of the conductor insulation. This can, for example, take place at the insertion opening of the clamping slot, possibly with the help of tearing edges *

The design of a clamping slit of this kind preferably takes place in such a manner that said narrowing is obtained by the shape of the clamping slit-defining tongues. In this way, the slit width becomes independent of methods of manufacture, where the narrowing is possibly adjusted by bending the tongues, and to which must be made strict requirements which do not cause insignificant expenditure. In order not to obstruct the insertion of a conductor in the clamping slit according to the invention, it is desirable that the slit from the narrowing towards the insertion opening again expands. Then a conductor can be guided unobstructed through the constriction and the 1 slit across it. In this connection, it is advantageous that the narrowing in relation to the length of the slit is in its middle region.

Temporal changes in the compressive force are avoided when the clamping slot is formed such that from the narrowing it preferably gradually extends towards the insertion opening, and from the narrowing to the conductor's pick-up location again preferably expands.

A particular embodiment of the clamp according to the invention is characterized in that the second plate is formed such that it contains clamping slots belonging to and preferably preferably slots adapted for conducting insulation, which serve for tensile relief of a clamped conductor. recessed legs on the second plate and by means of an extension in the middle serving portion and recessed legs on the second plate, or by a 180 ° bent end of a middle serving portion and recessed legs on the second plate .

For certain applications, a recess opening in the form, TAT 145, is required by an eye for the conductors to be connected and into which these can be inserted prior to the pinch in the slot for a lead-in guide. The clamp according to the invention is particularly suitable for forming such an eye and is characterized in this form in that the second plate is designed to be bracket shaped in such a way that it forms a closed eye from which the clamp slots are available. The special advantage hereby arises from the fact that the eye, which is necessarily at the free end of the clamp during the wiring, is subjected to mechanical stresses, e.g. by negligent touch or by necessary touch with tools that serve to push the conductors into the slots. Thus, it is required that a mechanical effect on the eye does not cause the clamping ratio of the clamp to change. This requirement satisfies the described embodiment in a particularly advantageous way, since no overloading of the outer tongues can occur over the eye.

Furthermore, the clip according to the invention offers the possibility of forming the plate with the eye at a thickness which makes it insensitive to mechanical stresses.

A further substantial advantage of the clamp according to the invention can be seen in that the front part containing the eye can be removed as desired, without changing the clamping ratio of the clamp to the slightest. It is also possible, if the eye is simply undesirable, to separate the front part containing it, and then use the otherwise unchanged plate for a clamp where the clamping slots are freely accessible. Hereby, the manufacture and the associated holding of parts for clamps in various embodiments are not entirely negatively simplified.

In order to see such dimensions as not to impede the insertion of the conductors to be connected, one embodiment of the clip according to the invention is peculiar in that the second plate is longer than the first plate.

The assignment of the conductors to the clamping slots during the wiring can be simplified, if the eye is divided into two separate areas, each of the slots belonging to each slit.

.This can be done by designing the middle tongue with an appropriate length. However, it can also be achieved by the part of the eye opposite the middle tongue having a projection directed towards it that divides the eye into two distinct regions.

In order to ensure the insertion of the conductor in the correct position, one embodiment is characterized in that the free end of the second plate is so curved that it lies in the plane of the first plate.

The invention is explained in more detail below with reference to the schematic drawing, in which fig. 1 is a perspective view of a first embodiment of a connection terminal according to the invention; 2, 3, 4 other embodiments of the clamp according to the invention; 5 and 6 show a fifth embodiment, and fig. 7, 8 and 9, 10-12, five other embodiments.

141145 5

The FIG. 1, the electrical connection scheme shown in Fig. 1 consists of two strip-lined portions 1 and 2, which with their wide sides abut each other and are interconnected by spot welding. Part 1 has a V-shaped notch 3 such that two tongues 4 at the edge of the clamp, which externally delineate clamp slots 7, are formed with abutments 5. Part 2 is formed so that two tabs are formed by means of a notch 8 , one of which has two legs 10 and 14 defining a tension relief slot 12, and the other having a leg 11 externally defining a tension relief slot 15 and a tongue 9 lying between the tongues 4. The tongue 9 is at by means of a cripple in the region 13 brought in between the tongues 4 so that the slots 7 are provided. Thus, by means of the plane 2 which is wider than the part 1, and which is brought into the shown shape by compression, the two relief slots 12 and 15 are formed, while the inner boundary of the clamp slots 7 is formed by the tongue 9 protruding. in the plane of the part 1. The legs 10 and 11, which externally delineate the slots 12 and 15, have on the edge extensions 6 which engage the outer edges of the tongues 4 and thus constitute a restriction on the springing occurring by squeezing a conductor. In this squeeze, the conductor for a lead-in guide can first be easily clamped with conductor insulation in the slot between the tongues 4 and 9, the illumination of which is slightly smaller than the outside diameter of the Insulated conductor. By a subsequent indentation in the terminal slots 7, the conductor insulation is cut on both sides and good contact is made between the conductor and the terminal where the conductor is relieved from the tension in the slots 12 and 15.

The fragmentary end opposite the slots shown in FIG. 1-5 embodiments of the present clamp may serve to secure in an insulating material holder, e.g. a dividing or squeezing list for telephone and telegraph wires, or for connection with another conductor by means of an appropriately designed insertion plug or by soldering or rewiring.

The FIG. 2 with two clamping slots is made up of three strip-shaped, band-shaped parts 16, 17 and 18 which abut with the wide sides facing each other together by spot welding. The clamping slots 19 and 20, whose edges penetrate the conductor insulation, are formed from the inside of tongues 24 and 25 formed by a U-shaped incision 21 in the portion 16 and the portion 18 between the inset and thus middle-serving portion 18. the inside of the seals 24 and 25 provided abutments 26 and 27 which hold the parts 16 and 18 spaced apart. Here, firstly, the areas of the portions 16 and 18 defining the slots 19 and 20 are designed so that their clearance from a narrowing in the insertion direction expands approximately to the conductor thickness. In this way, the conductor to be brought into the open end of the slit must be pressed in with increased force so that the conductor insulation is cut through securely and any oxide layers on the conductor surface are removed, and secondly, the clamping trays which define the slots only run when the conductor is placed in the final position, parallel to each other, so as to prevent an extension of the retained conductor '

The part 17 has U-shaped recesses 28 and 29 at the clamping slots, the illumination of which is somewhat smaller than the outside diameter of the insulated conductor, so that when it is squeezed, the tension is relieved. The outer legs 23 and 22 of the part 17 have, at their edges parallel to the recesses 28 and 29, projections 30 and 31 which engage the outer edge of the tongues 24 and 25 and thus constitute a restriction on the springing occurring at the conductor clamp.

The FIG. 3 with two clamping slots, consists of two parts 32 and 33 made by stopping and bending which are connected to each other by spot welding. On the part 33, by means of a roughly U-shaped recess 34, tongs 39 and 40 are formed, which externally delineate clamp slots 37 and 38. The part 32 is made with two planar legs 43 and 44 which externally delineate tension relief slots 35 and 36, while a middle leg serving portion 41 is crippled in a region 46 and the free end is bent 180 ° so that the clamp slots 37 and 38 lying in the plane of the portion 33 and the tensile relief slots 35 and 36 lying in the plane of the portion 32 their internal constraint. The clamp wear length is determined by the lugs 67 and 66 provided on the tongues 39 and 40.

In the clip of FIG. 4, the two ribbon-shaped parts 47 and 48 made by punching are also joined by spot welding. Tongues 49 and 50 externally delimiting clamping slots 57 and 58 are formed by a generally form-shaped recess, while clamping slots 57 and 58 are internally delimited by means of the center leg 51, crippled in the region 55.

This middle leg has an upright 54 which together with the legs 52 and 53 on the part 48 forms tension relief slots 59 and 60. In this embodiment, the trays which delimit the clamping slots are spaced apart by two abutments 64 and 65. The clamping of a conductor can in this embodiment takes place by means of a slider 61 which surrounds the clamp when mounted on it, and has recesses 62 and 63 in the region of slots 57 and 58 or 59 and 60. The lighting in these recesses roughly fits the exterior of an insulated conductor diameter and takes control of it at the squeeze. In addition, the springing of the tongues 49 and 50 of the slider 61 is restricted while squeezing a conductor. The slider can then be removed again.

In the embodiment shown in FIG. 5 shows tongs 78 and 79 which are externally delimiting clamping slots 76 and 77 by means of a generally V-shaped recess 70 in a band-shaped part 69. The band-shaped part 68, which is assembled with the point 69 by point welding, is in the free end is formed so that the portion 80, which is crippled in a region 73 and serves as the middle tongue 80, lies between the tongues 78 and 79 and thus constitutes the internal restriction of the slots 76 and 77. The tongues 75 and 76 are kept by means of the tongues. 78 and 79 7 1411Λ 5 away from the portion 80.

In this embodiment, the clamping of the conductors can be effected by means of a slider 81 which surrounds the clamp in the area of the clamping slots and has recesses 82 and 83, the illumination of which is somewhat smaller than the outside dimensions of an insulated conductor. At the enclosure of the outer tongues 78 and 79, excessive springing is prevented by the squeezing of the conductors so that sufficient force can be used to penetrate the conductor insulation, while due to the dimensioning of the recesses 82 and 83 a tensile relief for the conductors is obtained.

The part 78 also has two recesses 71 and 72 in which the slider engages after the squeeze. It can then remain in this position with the clamp.

The FIG. 7, having a special clamp lid configuration, is made of two superposed band-shaped metal parts, of which one 91 carries the middle tongue 92. On the part 91 lies the other part carrying the two outer tongues 93 and 94. The middle tongue 92 is bent into the plane of the tongues 93 and 94 such that the three tongues at the clamping slots are in the same plane.

In this area, there are two notches 95 and 96 open towards the end of the clamp, providing space for conductors to be later inserted into the clamp slots. The conductors can be placed in these incisions during work on a wiring.

To these incisions, terminal slots 97 and 98 join with insertion openings 107 and 108. At the transition from the incisions to the terminal slots, tear edges 99, 100 and 101, 102. These edges penetrate through insertion into the terminal slots of insulated conductors and intersect them. on both sides so that the blank conductors enter the clamp slots upon further insertion.

The slots of the clips shown have constrictions 105 and 106 between recording locations 103 and 104 for the conductors to be connected and the insertion openings at said tear edges. The constrictions 105 and 106 are formed by the shape of the outer tongues 93 and 94. The slit boundaries formed by these are arcuate in shape, the apex of the arc being approximately in the middle of the slit. Thus, up to this point, from the introductory opening, there is a gradual narrowing and then a gradual extension up to the recording sites 103 and 104.

These are formed in the tongues 93 and 94 by means of the smaller diameter circular arcs which extend opposite to the aforementioned, which extend into the bottom of the clamp slots.

The FIG. 8 and 9 are composed of two band-shaped parts 111 and 112. The part designated 111 can, for example, consist of fresh silver and the valley 112 of beryllium bronze. The portion 112 is provided with a recess 115 in such a way that at its free end two tongues 113 and 114. appear at the same end, the portion 111 has an opening 116 with a tongue 117 which continues with incisions 118 and 119 8 141146 from the aperture into the portion 111. The tongue 117 is provided with a crease in a region opposite the free end in such a way that when the parts 111 and 112 are joined together as shown in FIG. 9, will lie in the recess 115 in the portion 111 and here will lie between the tongues 113 and 114. formed on this part, the tongue is inserted into the recess 115. By means of the tongues 113 and 114 and the tongue 117, two clamping slots 120 and 121 are provided which are parallel to one another. These clamping slots have the following areas of different width. The free end of the portion 111 has, above the tongues 113 and 114 of the portion 112, a further crease so that the edge defining the opening 116 is above the same plane as the portion 112.

The assembled parts H1 and 112 are assembled by means of a spot weld 123. As can be seen from the drawing, the two parts are of different thickness, the portion 111 with the tongue 117 being thicker than the portion 112 with the tongues 113 and 114. The spring force which causes the squeezing in the slots, therefore, are produced by the outer tongues 113 and 114 which act against the relatively rigid tongue 117. As the guide orifice or eye is in contact with the tongue 117, a mechanical effect of an eye which, due to its location in the first row could be exposed to such, not affecting the clamping ratio.

FIG. 10, showing in this context the region of the clip of FIG. 8 and 9 in perspective, the shape thereof is clarified at the clamping slots 120 and 121. The portions 124 and 125 which define at the sides the opening in the part 111 which constitutes said conduction guide eye, which are interconnected by the part 122 and which lie parallel to the clamping slots 120 and 121, it is advantageous to use as a guide or plant for a tool, by means of which conductors to be connected to the clamp can be inserted. In particular, for the purposes indicated, the inside of these parts is suitable.

In FIG. 11 shows a clamp also made of band-shaped parts 111 and 112 and differing only from the clamp of FIG. 8-10 know that parts 124, 125 and 122 are removed. Thus, there is a clamp whose clamping slots are freely accessible and where it is not necessary to conduct conductors to be connected through the aforementioned eye. Such connectivity is required in different applications. The clamping slots are delimited as before by the outer tongues 113 and 114 on the part 111 and the middle tongue on the part 112. The design of the clamp according to the invention makes possible the separation described without the lack of the parts forming the said eye having any influence on the clamping ratio of the clamp. .

In the embodiment shown in FIG. 12 in the embodiment shown in the fragment there is again a band-shaped part 112 with outer tongues 113 and 114. Instead of the part 111 there is here a band-shaped part 126 with a middle tongue 127. The part 126 differs from the part 111 in fig. 8 and 9 in three respects. It is partly wider and partly

Claims (10)

1. Connection terminal for uninsulated connection of electrical wires and with three tongues forming two adjacent terminal slots, said terminal consisting of two adjacent and interconnected flat ribbon parts or plates, characterized in that the outer tongues are formed on a first and the middle tongue lying on a second plate, and that the tongues are so arranged and formed that the areas limiting the clamping slots lie in one plane. Clamp according to claim 1, characterized in that the middle tongue is bent into the plane of the first plate. Clamp according to claim 1, characterized in that the middle tongue is formed as a third band-shaped part or plate, connected therewith to the second plate. 4. A clamp according to claim 1, characterized in that the outer tongues are formed by a recess in the first plate. Clamp according to claims 1 and 4, characterized in that the middle tongue of a part of the length is fitted in the recess limited by the outer tongues. 6. A clamp according to claim 5, characterized in that said fitting is made by means of abutments perpendicular to the clamping slots lying on the middle tongue and / or the outer tongues. Clamp according to claim 1, characterized in that the second plate consists of a material other than the first plate, Clamp according to claim 1, characterized in that the second plate has a different thickness than the first plate. Clamp according to claim 1, characterized in that the second plate is at least partially wider than the first plate and forms abutments which limit the springing of the tongues on the first plate. 9 141U5 protrusions 128 and 129 at the outer edges of the tongues 113 and 114. These compressions form abutment surfaces for limiting the tongue suspension. Finally, in this embodiment, the tongue 127 is provided with a fore part 131 which divides the aforementioned eye into two separate regions, each with its own clamping slot 120 and 121. The front part 131 does not communicate with the portion 130 which defines the eye above. This part can be removed at will without affecting the clamping '' * ratio. In this case, it is also convenient to remove the front part 131, and it is also possible to remove the parts containing the supports 128 and 129, after which the clamp corresponds to the one in fig. 11. Clamp according to claim 9, characterized in that the stops are formed by grooves in the side edges of the second plate.