FR2764125A1 - SLOT CONNECTION PIECE FOR CONNECTION ARRANGEMENT FOR AT LEAST ONE ELECTRIC WIRE - Google Patents

Abstract

Slotted connection piece for connection arrangement for at least one electric wire. The electrically conductive connection piece (1) is provided with at least one elongated slot, flared and emerging at one end, to allow transverse insertion of at least one electric wire between the slot edges which are arranged to retain the conductive core of this wire in position by wedging The slot is defined by two of the edges of the part determining two parallel lips (5A, 5B) and a rimmed mouth (8A, 8B). These edges respectively terminate two first piece elements, converging, extending on the same side of the piece two second elements (3A, 3B) of this piece which are themselves parallel and joined to each other by a connecting element (2) located at one end of said second elements in a U-shaped arrangement. The connecting element is located on one of the sides of the part which is adjacent to that where the slot extends.

Description

The invention relates to a connection piece with stripping and / or

  retainer for connection arrangement for one or more electrical wires.

  As is known, such arrangements are used in particular to connect electrical wires to one another in specialized members, such as terminal blocks, or to connect wires to electrical equipment. Typically, such an arrangement comprises a stripping and / or retaining slot for at least one wire which is formed in a conductive piece of small thickness. One end of the slot is provided with a flared mouth intended to facilitate the longitudinal insertion of a wire, transversely with respect to the slot where this wire must be connected electrically and simultaneously

  in most cases, ensure a cross section of the insulation covering the wire.

  The core of the wire, locally stripped by the slit mouth, comes into contact with the edges of this slit which immobilize it by pressure and which provide electrical continuity between the core of the wire and the conductive part where the slot. The wire sheath is often wedged simultaneously between the edges of a sheath wedge opening which extends in the vicinity and facing the slit

  retainer in an insulating box where the conductive part is housed.

  As is also known, by their constitution, the known arrangements are generally calibrated for a relatively limited range of wire core diameters for which the wires are held and connected reliably by their cores and with characteristics determined. It is therefore necessary to produce the same layout model with dimensions which differ slightly to cover the range, known to those skilled in the art, of electrical wires for which it is possible to envisage a connection of this

way.

  In addition, it is often difficult to connect two wires in the same slot in a reliable manner and with characteristics lying within a range.

  sufficiently limited to be acceptable.

  The invention therefore provides an electrically conductive connection piece, for connection arrangement with stripping and / or retaining slot for one or more electric wires more particularly intended to allow the range of admitted core diameters to be widened and / or a connection of more than one wire in one

same slit.

  As is known, the connection piece is provided with at least one elongated slot, flared and opening at one end, to allow transverse insertion of at least one electric wire between the edges of the slot which

  are arranged to retain the conductive core of this wire in position by wedging.

  The slit is defined by two of the edges of said part which respectively terminate two first part elements, planes, curves or composites and converging towards said slit. These first elements extend on the same side of the part two second elements of this part which are themselves parallel and joined to each other, in a U-shaped arrangement, by a connecting element located

at one of their ends.

  According to a characteristic of the invention, the connecting element is located on one of the

  sides of the part which is adjacent to that where the slot extends.

  According to a characteristic of the invention, said connecting element is located on the other side of the part with respect to the slot edges which form the

  slit mouths used for the introduction of wire (s).

  According to a characteristic of the invention, the part is symmetrical with respect to a median plane on either side of which the connecting element extends symmetrically, and it comprises at least two second elements folded down in the same direction of on either side of this connecting element which unites them so as to be parallel to the median plane of symmetry and two first elements symmetrically projecting and on the same side of the second elements which they extend

  obliquely to delimit said slot.

  According to a characteristic of the invention, the part comprises at least one slot, delimited by two edges each terminating a first element, which itself comprises a mouth for inserting wire provided with two stripped edges

  each arranged on a different edge.

  According to a characteristic of the invention, the part comprises at least one slot, delimited by two edges each terminating a first element, which itself comprises a thread insertion mouth provided with two convex edges

  wire support each arranged on a different edge.

  According to a characteristic of the invention, the part comprises stripping teeth which are respectively arranged on either side of a slit mouth and which correspond to a pointing of the subassembly formed by a first

  element and / or by the second element which carries it.

  According to a characteristic of the invention, the part has a transverse size, at least at the level of two stripping teeth arranged on either side of a slit mouth, which is likely to be less than the diameter

  a sheathed electrical wire intended to be connected to it.

  According to a characteristic of the invention, the part comprises at least a first element which is partially separated by a slot, called bending, from the second element which it extends, said bending slot opening opposite the mouth of the stripping and wire retaining slot bordered by this first element. According to a characteristic of the invention, the part comprises bending slots which extend parallel or almost parallel to the wire retaining lips of the stripping and retaining slot which they surround. According to a characteristic of the invention, the part is associated with an identical part to which it is connected by a common connecting bar for

  constitute a double connection piece.

  The invention, its characteristics and its advantages are specified in the description

  which follows in conjunction with the figures mentioned below.

  Figures 1, 2 respectively show a front view and a top view

  a connection piece according to the invention.

  Figure 3 shows a front view of a blank cut from which the

  connection piece shown in Figures 1 and 2.

  Figure 4 shows a perspective view with wire inserted from the part

shown in Figures 1 and 2.

  Figures 5 and 6 show a front view and a perspective view

  of a first alternative embodiment of connection piece according to the invention.

  FIG. 7 presents a diagram showing the possibilities of positioning wires with a slit mouth of a connection piece such as

shown in Figures 5 and 6.

  FIG. 8 presents a diagram showing the possibilities of positioning of wires with a variant of connection part slot as presented in FIG. 7. FIG. 9 presents a front view of a second alternative embodiment of

  connecting piece according to the invention.

  FIG. 10 presents a perspective view of the variant presented in

  Figure 9 with wires in position before insertion.

  Figures 11, 12 and 13 respectively show a front view, a right view and a top view of a third variant of the connecting piece according to the invention. Figures 14 and 15 each show a front view of the connection piece shown in Figures 11 to 13, Figure 14 showing an example of insertion

  of a wire and Figure 15 showing an example for two wires.

  Figure 16 is a perspective view corresponding to the assembly presented

in Figure 15.

  The connecting piece 1 with stripping and wire retaining slot presented in FIGS. 1, 2 and 4 is for example intended to be part of a connection arrangement for electrical wires o this piece is immobilized for example by embedding in a housing formed in a body of insulating material, not shown. As is known in this field, this body is often made up of two complementary pieces of molded insulating material, as in particular provided for in document FR-A-2598039 also relating to a

  connection arrangement for electric wires.

  The connecting piece 1 is for example produced by cutting, folding and localized thinning carried out by stamping on a rigid metal blank, good conductor previously cut from a strip, such as that, also referenced

  1, the cutout of which is presented in FIG. 3.

  This blank 1 is here symmetrical with respect to a transverse axis XX ′ here situated at the level of a middle part 2, here called connecting element, narrower than the rest of the blank which is intended to be a junction zone on the side and other of which the two blank portions 3A and 3B which border it are folded perpendicularly to them at a level symbolized by the axes AA 'and BB' and in the same direction so as to delimit two large parallel faces, here called second room elements. Said connecting element 2 is then located at one end of the second part elements with which it constitutes a U-shaped structure. The smaller width of the connecting element 2 relative to the rest of the blank is obtained by cutting a strip perpendicularly to the axis

  transverse XX 'on one of the sides of this blank.

  Oblique folds or bends, converging when the connecting piece 1 is formed, are produced at the parts 4A and 4B located on either side of the transverse axis XX 'and beyond the connecting element for form two elements, called first part elements, which will delimit the stripping and retaining slot of this part 1. These folds are carried out in a single operation at a level symbolized by an axis CC 'disposed at the edge of the connecting element 2 perpendicular to the transverse axis XX ', they give rise to the first

  elements of flat, curved or possibly composite parts.

  The part is here assumed to be symmetrical with respect to a median plane on either side of which the connecting element extends symmetrically. It then comprises at least two second elements folded in the same direction on either side of this connecting element which unites them so as to be parallel to the median plane of symmetry and two first elements symmetrically produced in projection and on the same side of the second elements that they extend obliquely to

  delimit the stripping and / or retaining slot.

  As known, the edges of the first elements 4A, 4B which are intended to delimit the stripping and retaining slot 6 of the connection piece 1 are prepared to constitute two parallel lips 5A, 5B and in particular cut and thinned to form the edges 8A , 8B from a flared stripped mouth to a

end of this slot.

  In practice, the lips 5A, 5B and the edges 8A, 8B are prepared before folding and while the blank is still flat and the folding at the level of the axis CC 'is carried out before the two folds at the level of the axes AA' and BB '. The connecting element 2 is then located on one of the sides of the part which is adjacent to that o

  extends the slot on the other side of the part with respect to the slot edges 8A, 8B.

  In the embodiment presented, the mouth is produced by oblique cutting and stamping of the edges 8A, 8B beyond the parallel lips 5A, 5B at the respective ends of the first elements 4A and 4B which are the most distant from the element of connection 2. The mouth is then located at one end of the connection piece 1 which is opposite to that o is the connecting element 2. As known, the mouth obtained allows to locally strip the core of a wire pushed in force through this mouth while cutting the insulating protective sheath covering this core, as shown in FIG. 4. An electric wire 7 is shown wedged between the lips SA and 5B of the slot 6 by its core 7A beyond the mouth which has allowed the guiding of this core between these lips, after having ensured a local cutting of the sheath 7B by means of its

banks 8A, 8B.

  The insertion of the core 7A of a wire between the lips SA, 5B tends to open the connection piece by spreading the second elements 3A, 3B from each other at the respective free ends of these second elements which are opposite the connecting element 2. It is therefore possible for a connection piece 1 of this type to receive a larger range of wire diameters than that provided with the connection piece described in the document FR -A-2598039 already cited above. It is then necessary to leave a possibility of spacing at least one of the two second elements 3A, 3B at the free end of at least this second element in the not shown housing of the insulating body o is

  positioned the connecting piece 1.

  The connection of an electric wire to a connection piece 1 by immobilizing the core of this wire between the edges of the slot that this piece comprises, supposed to be housed in a housing made of insulating material, is capable of being made at using a hand tool or mounted on a machine. This tool is, for example, of the type described in document FR-A-2584538. Another slot may be made in a wall of this box opposite the slot 6 of a connection piece 1 housed in this box. As known, this other slot provides additional support for a wire by jamming the sheath of this wire in addition to that provided by the jamming of the core of this wire by

the edges of the slot 6.

  It is also planned to associate a connection piece 1, as mentioned above, with a piece of the blocking push button type, not shown, preventing a return of the wire to the mouth of the slot through which it has been inserted as long as the blocking push-piece type has not been released and / or removed. Such a blocking plunger is capable of being constituted by a slide which can be moved from the outside of the housing where the connection piece 1 is housed between a position for which it is possible to insert a wire, between one end of the wire support. of said blocking pusher and the mouth of slot 6 of this connection piece, and a position for which immobilization of wire is ensured by

  cooperation of the edges of said slot 6 and by the blocking pusher.

  In a first embodiment presented in FIGS. 5 and 6, provision is made to make a connection piece 1 ′ with a wire retaining slot 6 ′ with convex edges 8C, 8D at its mouth on the rounded part of each. which then comes to bear the conductive core 7'A of an electric wire for example under the action of a blocking pusher as mentioned above, this pusher being here symbolized by the arrow F. This piece of connection 1 'is capable of being coupled to an identical or similar piece oriented in opposite directions, so that the retaining slots of one and the other of these two pieces are opposite one of the other at the level of the assembly that said parts form, as can be seen in FIG. 6 o two parts 1 'are joined to each other by a common bar 9 with which their respective common elements 2 are

  aligned to form a double piece, as classic in this area.

  Of course, other arrangements are possible, and in particular the double piece may include two connection pieces joined by a common bar folded at right angles at its ends so that the slots of the two connection pieces are aligned and with their mouths oriented in reverse. All this can of course be applied to the connection piece 1

  presented in conjunction with Figures 1 to 4.

  FIG. 7 makes it possible to visualize the advantages presented by a mouth delimited by convex banks; such as the edges 8C, 8D assumed to be produced by cutting before the folds are made, making it possible to obtain the

  connection 1 ', or the two connection pieces coupled together, from a blank.

  It is then possible to connect webs of sheathed wires having markedly different diameters to connection pieces of the same dimensions, as symbolized by the webs of decreasing diameters 7'Al, 7'A2 and 7'A3 in FIG. 7, only the sheath 8'A1 covering the core of the wire 7'AI being here referenced. The holding in position of a core against the banks 8C, 8D is ensured by pressure means symbolized by the arrow F, and for example produced in the form of a

  blocking pusher, as indicated above in relation to FIG. 5.

  An alternative embodiment of a wedging lip 5 B of a slot 6, similar to the slot 6 for a connection piece as presented in FIG. 1, is proposed on the part situated to the left of the vertical axis Y ' -Y of Figure 8 and above the X'-X axis of this figure. This slot 6, symmetrical, is assumed to have two mouth edges corresponding for example to those mentioned in connection with the embodiment shown in Figures 1 to 4 and symmetrical lips of wedging wire whose shape is shown in Figure 8 for the

lip 5 B.

  This lip is here assumed to be slightly inclined relative to the axis of the slot symbolized by the axis Y'-Y so that the slot widens slightly towards its stripping mouth for the wires so that the wires are more or less immobilized. deep between the wedging lips according to their respective diameters. The diameters of wire cores envisaged with such a slot are symbolized by the semicircles presented to the right of the axis Y'-Y in FIG. 8, their respective wedging positions as a function of their diameters being

shown to the left of this axis.

  In an alternative embodiment of such a slot, it is provided that each wedging lip comprises at least one recess for blocking the core of a wire of large diameter, such as the recesses 14 and 14 produced for the cores 7 "A1 and 7 "A2 whose respective sizes are the largest on lip 5 B and

  symmetrically on the other lip not shown of slot.

  Another alternative embodiment of connection piece according to the invention is presented in FIGS. 9 and 10, it more particularly has the object of allowing a connection piece 1 "of small width, the latter being likely to be smaller than the diameter of a wire 7 intended to be connected thereto, as

shown in Figure 9.

  For this purpose the side from which the connection piece 1 "is derived is capable of being folded in a manner similar to that described above in connection with the blank for connection piece as presented in FIG. 3, it however has

  cutting differences shown in dotted lines in this figure 3.

  These differences relate in particular to the second elements 3A and 3B of the connection piece 1, the portions of which here supposed to be rectangular 3 "Al for one and 3" BI for the other have been eliminated so as to allow only pointed elements to be substituted tooth-shaped lOA and lOB between which the stripping and wire retaining slot 6 "is arranged, in particular in the zone where the mouth of this slot is located. In one embodiment, the cutting of the converging edges 8E, 8F delimiting the slot 6 "at its mouth are produced by oblique cutting of the edges 5A, 5B of the flank which leads to a reduction in width of the teeth 10OA, 10B, called stripping, from their bases towards their respective ends and at elimination of the referenced parts

  4A l "and 4B l" limited by a dotted line in Figure 3.

  These teeth 10A, lOB are respectively arranged on either side of a

  6 "slot opening and each corresponds to a sub-point design

  assembly formed by a first element and / or by the second element which carries it.

  In the example envisaged, the converging strands 8E, 8F are sharpened over at least part of their length in order to be able to provide localized stripping of the core 7A of a wire 7 pushed between these strands with respect to which wire is then at less roughly arranged transversely. The sheath 7B of the wire 7 is then crossed by the teeth 10A, lOB with which the core 7A of the wire comes into contact so as to be guided up between the wedging lips SA, 5B of the slot

  which are at least initially parallel or almost parallel.

  The elimination of the portions 3A l ", 3A2" from the blank has the effect of making it possible to reduce the width of the connection piece by reducing the connecting element 2, since it optionally allows the sheath of the wire to extend laterally on either side of the 1 "connection piece, as shown on the

figure 9.

  The transverse size of the part, at least at the level of two stripping teeth arranged on either side of a slit mouth, is then likely to be less than the diameter of a sheathed electric wire intended to be there connected. It is of course possible to produce a double part by association of two 1 "parts joined for example to alignment by a common bar 9 and oriented in opposite directions, as already indicated above in relation to the

figure 6.

  Another alternative embodiment is shown in Figures 10 to 15, it relates to a connection piece 3 "'according to the invention which is more particularly intended to allow the connection of one or possibly of

  multiple wires through the same slot, if necessary.

  The side from which the connection piece 1 "′ comes is still capable of being folded in a similar manner to that described above in connection with the blank for connection piece 1 as presented in FIG. 3, it differs here from the latter by the particular cutting of the edges of the first elements where the edges are made

  and lips of a stripping and retaining slot 6 "'.

  This particular cut which is carried out identically on the first and / or second elements of each connection piece 1 "'as already assumed for those provided on the connection pieces 1" and 1'. To this end, and as can be seen in FIG. 12 for one of the second elements of the connection piece 1 "', provision is made for a slot 12, called a bending slot, open at one end between the part of part forming a second element such as 3 "'B of a connecting part and the corresponding part 4"' B. As previously, the part 4 "'B and the corresponding part 4"' A, not shown here, are subjected to oblique bends of axis CC ', becoming convergent when the connecting piece 1 "' is formed. The elongated portion of part 4 "'B which includes one of the retaining lips of the slot 6"' is connected to the second element 3 "'B only by one of its two ends and therefore has a certain freedom of displacement with respect to this second

  element. It is the same for the corresponding part 4 "'A.

  In the exemplary embodiment envisaged, in FIGS. 10 to 15, it is assumed that the slot 6 "'is produced in the same way as the slot 6 and therefore comprises a mouthpiece with two edges 8A"', 8B "'analogous at the edges 8A, 8B, and a retaining part formed by two parallel or quasi-parallel lips 5A "', 5B"'

similar to lips 5A, 5B.

  The connection of a wire in a connection piece 1 "'implies that one end of this wire is brought into position transversely relative to the mouth of the slot 6"' via which it must be introduced. between the retaining lips SA "', 5B"' of this slot. This connection presented in FIG. 14 is capable of being carried out using a pusher specific to the housing in which the connection piece 1 "'is assumed to be housed or a tool, preferably specialized, coming into said housing to push the wire into the slot. The insulating sheath 7B of the wire to be connected then comes to bear against the edges 8 "'A, 8"' B of the mouth of the slot 6 "'which starts this sheath, as known under the effect of the pressure exerted on the wire to make it enter the slot. The core 7A stripped by the action of the edges on the sheath 7B then comes into contact with the slot edges and comes to penetrate between the lips 5 "'A, 5"' B which it tends to spread apart one of the 'other. This here tends to cause an opening of the U formed by the second elements 4 "'A, 4"' B and by the connecting element 2 which unites them. As is known, the dimensioning and the mechanical characteristics of the part are determined in a manner known to those skilled in the art so that the core of the wire undergoes a determined retaining pressure, it being assumed that said

  wire is included in the range of wires planned for the part considered.

  In the proposed embodiment, it is provided that it is possible to insert a wire into the slot to a position determined by two stops 13 formed at the ends of the two lips 5 "'A, 5"' B which are at the opposite of the mouth of the

6 "slot.

  As shown in Figures 15 and 16, it is possible to connect two wires in the same slot 6 "'of connection piece 1"'. After insertion of a first wire between the lips via the mouth of the slit, as indicated above and as

  shown in figure 14, it is planned to insert a second wire in the same way.

  The sheath 7 "'B of this second wire is pressed against the edges 8"' A, 8 "'B of the slit mouth 6"' which locally strip the core 7 "'A and guide it between the lips 5 "'A, 5"' B. The sheath 7 "'B then presses against the sheath 7B of the first wire introduced and causes the displacement of the core 7A of this wire between the lips towards the stops 13 ending the slot 6" The restraining forces are applied in an almost equivalent manner by the lips 5 "'A, 5"' B on the two cores 7A and 7 "'A because of the shape and the relative elasticity given to the parts 4"' A, 4 "'B due to the presence of the slots 12 which allow these

  parts of resiliently pressing the lips against the souls.

Claims (7)

  1 / Electrically conductive connection piece (1), for connection arrangement with stripping and / or retaining slot for one or more electric wires (7), provided with at least one slot (6) of elongated, flared shape and opening at one end, to allow transverse insertion of at least one electric wire between the slit edges which are arranged to retain the conductive core (7A) of this wire in position by wedging, said slit being defined by two of the edges of said part which respectively terminate two first part elements (4A, 4B), planes, curves or composites and converging towards said slot, extending on the same side of the part two second elements (3A, 3B) of this part which are themselves parallel and joined to each other by a connecting element (2) located at one end of said second elements in a U-shaped arrangement, characterized in that this connecting element   is located on one of the sides of the part which is adjacent to that where the slot extends.   2 / part according to claim 1, characterized in that said connecting element is located on the other side of the part with respect to the slot edges (8A, 8B) which   form the slot or mouths for the introduction of wire (s).   3 / Part according to one of claims 1, 2, characterized in that, symmetrical by   relative to a median plane on either side of which the connecting element extends symmetrically, it comprises at least two second elements folded in the same direction on either side of this connecting element which unites them so to be parallel to the median plane of symmetry and two first elements symmetrically projecting and on the same side of the second elements that they   extend obliquely to delimit said slot.   4 / Part, according to one of claims 1 to 3, characterized in that it comprises   at least one slot (6), delimited by two edges each terminating a first element, which itself comprises a thread insertion mouth provided with   two stripped banks (8A, 8B) each formed on a different edge.   / Piece, according to one of claims 1 to 3, characterized in that it comprises   at least one slot (6 '), delimited by two edges each terminating a first element, which itself comprises a thread insertion mouth provided with two convex thread support edges (8B, 8C) each formed on a different edge.   6 / Part, according to one of claims 1 to 4, characterized in that it comprises   stripping teeth (1OA, 10B) which are respectively disposed on either side of a slit mouth (6 ") and which correspond to a pointing of the subassembly formed by a first element and / or by the second 7 / part according to claim 6, characterized in that it has a transverse size, at least at the level of two stripping teeth arranged on either side of a slit mouth, which is susceptible to be   smaller than the diameter of a sheathed electrical wire intended to be connected to it.   8 / Part, according to one of claims 1 to 4, characterized in that it comprises   at least a first element (4 "'A) which is partially separated by a slot (12), called bending, from the second element (3"' A) which it extends, said bending slot opening opposite to the opening of the stripping slot and   wire retainer (6 "') bordered by this first element.   9 / Piece, according to claim 8, characterized in that it comprises flexion slots which extend parallel or almost parallel to the lips (5 "'A,"' B) for retaining wire from the stripping slot and restraint (6 "') they surround.   / Part according to one of claims 1 to 9, characterized in that it is   associated with an identical part to which it is connected by a strip of   joint connection to constitute a double connection piece.