FR3048558A1 - ELECTRICAL CONNECTION SCREW TERMINAL WITH ELECTRICAL WIRE MAINTAINING MEMBER - Google Patents

Abstract

The invention relates to an electrical connection screw terminal comprising a metal body which delimits a cavity (15) intended to receive, via an inlet opening, an end of the metal core (51) stripped of at least one wire. electrical (50), and a clamping screw (20) passing through said metal body. According to the invention, there is provided, in the immediate vicinity of said inlet opening, a holding element (140) which comprises at least one receiving housing (141) of a part of the insulating sheath (52) of each electric wire, accessible by a flared entry (142) whose section decreases to a throttling area (143).

Description

Technical field to which the invention relates

The present invention generally relates to the field of the electrical connection, and in particular that of the connection of an elongated electrical connector, such as an electrical wire, to an electrical connection screw terminal.

It relates more particularly to an electrical connection screw terminal comprising a metal body which delimits a cavity intended to receive, via an inlet opening, an end of the metal core stripped of at least one electrical wire, and a screw of clamping through said metal body.

It also relates to an equipment mechanism comprising an insulating base enclosing a functional part connected to an electrical connection part.

Finally, it relates to electrical equipment comprising an equipment support, electrical equipment which is secured to said equipment support, and a hubcap which is attached to the front of the base of said equipment mechanism. The invention finds a particularly advantageous application in the production of electrical equipment of the switch type, back and forth, electrical drive, power socket, network socket (RJ45), telephone socket (RJ11), indicator, detector ( smoke, flood, temperature, movement or light), etc.

Technological background

Screw terminals are commonly used to securely connect an insulated electrical wire to a functional element of an electrical equipment mechanism. Such a screw terminal is described in particular in US4556273.

Conventionally, a user inserts the stripped metal core of an electrical wire into the cavity of this screw terminal, then he screws the clamping screw to compress said stripped metal core against the metal body of the screw terminal, which has the effect of establishing the electrical connection between the electrical wire and said functional element.

However, during such a tightening operation, the user must both hold the insulated electrical wire in place in the cavity of the connection terminal, firmly hold the base of the electrical equipment, and screw in the clamping screw. for clamping the metal core of said electrical wire into the cavity.

The concomitant implementation of these three actions is impractical, at the risk, when screwing the clamping screw, a portion of the metal core of the electrical wire is extracted from the cavity of the screw terminal. The metal core is then only partially held against the metal body of the screw terminal, which generates a bad electrical contact and induces the risk of dangerous heating of the poorly made electrical connection.

Object of the invention

In order to overcome the above-mentioned drawback of the state of the art, the present invention proposes an electrical connection screw terminal as defined in the introduction, in which, in the immediate vicinity of said inlet opening, a holding element which comprises at least one housing for receiving a portion of the insulating sheath of each electrical wire, accessible by a flared inlet whose section decreases to a throttling zone.

Thanks to the invention, said holding member allows, via the insulating sheath of the electric wire, to block the metal core of said electrical wire in place in the cavity, while a user screws the clamping screw.

Thus, the user of the connection screw terminal according to the invention can operate in two stages: in a first step, he places the metal core of the electrical wire at the appropriate place of the cavity and blocks it in position inserting the insulating sheath of said electrical wire into the holding member; in a second step, it screws the clamping screw so as to compress the stripped metal core of the electric wire against the metal body of the connecting screw terminal, without having to worry about said electrical wire which is held in place in the terminal thanks to the holding element. Other non-limiting and advantageous features of the connection screw terminal according to the invention are the following: each receiving housing of the holding element is delimited, on one side, by a tab adapted to flex for departing from an original position to widen said throttling zone; - Each receiving housing of the holding member is defined by two lugs disposed opposite one another with respect to the flared inlet and adapted to move away from each other; the holding element is molded in a plastic polymer material; each receiving housing of the holding element has a cradle shape with a rounded bottom adapted to the shape of the insulating sheath of said electric wire; the section of the flared entry decreases to the throttling zone which has a constant section and then a section which increases linearly; - It is provided in the immediate vicinity of said cavity inlet opening, on either side of an axis of passage of the electrical wire, two edges which each comprise a tapered zone of engagement in the insulating sheath of said electric wire. ; along the axis of passage, said nips are placed offset with respect to the holding element; - said menses are positioned in the receiving housing of said holding member. The invention also proposes an equipment mechanism comprising an insulating base enclosing a functional part connected to an electrical connection part, in which the electrical connection part comprises at least two screw terminals according to the invention. Finally, the invention proposes an electrical apparatus comprising an equipment support, an equipment mechanism according to the invention which is secured to said equipment support, and a hubcap which is attached to the front of the base of said fitting mechanism. .

Detailed description of an example of realization

The following description with reference to the accompanying drawings, given by way of non-limiting examples, will make it clear what the invention consists of and how it can be achieved.

In the accompanying drawings: - Figure 1 is a schematic representation in perspective before a screw terminal; FIG. 2 is a partial schematic side view of an apparatus mechanism according to the invention, comprising the screw terminal of FIG. 1; - Figure 3 is a partial schematic rear perspective view of a first embodiment of an apparatus mechanism according to the invention; FIG. 4 is a partial schematic rear perspective view of a second embodiment of an apparatus mechanism according to the invention in which an electric wire is engaged; FIG. 5 is a partial schematic rear perspective view of a third embodiment of an apparatus mechanism according to the invention; FIG. 6 is a partial schematic side view of the apparatus mechanism of FIG. 2 in which a small section electrical wire is engaged; - Figure 7 is a partial schematic side view of the fitting mechanism of Figure 2 in which a large section of electric wire is engaged; - Figure 8 is a schematic sectional view of the mechanism of a socket comprising three screw terminals according to the invention; FIG. 9 is a diagrammatic diagrammatic view of the zone IX of FIG. 8; FIG. 10 is a schematic view in front perspective of the socket of FIG. 9; and - Figure 11 is a schematic rear perspective view of the socket of Figure 10.

In the following description, the front and back will be defined relative to the view of the user.

Thus, the front of an electrical equipment is located on the side of the hubcap of this apparatus, while the rear face is located opposite to this hubcap.

In Figure 10, there is shown the front of an electrical equipment which is here a socket.

This socket conventionally comprises an equipment support 200, an equipment mechanism 1000 which is mounted in the central opening of the equipment support 200, and a hubcap 300.

The apparatus mechanism 1000 comprises an insulating base 100 enclosing a functional portion, connected to an electrical connection portion.

The base 100 of the equipment mechanism 1000 comprises means for fixing the equipment support 200. Here, the equipment support 200 is in the form of a flat, square frame, which defines a central opening to the inside which is engaged the base 100 of the equipment mechanism 1000.

Furthermore, the hubcap 300 is provided to close the front opening of the base 100 of the equipment mechanism 1000.

This embellisher 300 here defines a well insertion of an electrical plug. It is removably attached to the base 100 of the equipment mechanism 1000.

In Figure 11, there is shown the rear face of the socket, which is the face by which a user can electrically connect said equipment mechanism 1000 to at least one electrical wire 50.

Conventionally, the electrical wire 50 comprises a conductive metal core 51 surrounded by an insulating sheath 52, generally made of plastic material.

The electric wires used here have either a large section of 2.5 mm 2 or a small section of 1.5 mm 2.

The electrical connection part of the equipment mechanism 1000 comprises at least two screw terminals 1, each screw terminal 1 being adapted to establish the electrical connection between each electrical wire 50 and said equipment mechanism 1000.

Classically also, there is provided in the apparatus mechanism 1000, three screw terminals 1, two being intended to receive the electrical son of phase and neutral, the third receiving the ground wire.

In Figure 1, there is shown one of these screw terminals 1.

Such a screw terminal 1 here comprises two parts: a first part 2 which provides the electrical connection and the attachment of the electrical son or wires 50, and a second functional part 3 of the electrical equipment mechanism 1000.

As shown in Figure 1, the screw terminal 1 comprises a metal body 10 and a clamping screw 20 passing through said metal body 10 along an axis X screwing.

The metal body 10 is here formed in one piece, by cutting and folding a metal fire bacon.

According to the illustrated embodiment of the screw terminal 1, the metal body 10 and the clamping screw 20 are arranged such that once the screw terminal 1 implanted in the base 100 of the equipment mechanism 1000, the clamping screw 20 of the screw terminal 1 is accessible from the front face of said fitting mechanism 1000. It is then necessary to remove the trim 300 to access the clamping screw 20.

Of course, there are also screw terminals arranged so that once implanted in the base of the fitting mechanism, the clamping screw is accessible through the rear face thereof.

Here, each screw terminal 1 being intended to be used in a socket, the second functional part 3 is designed to form a receiving cell 31 of a pin of a plug.

But, of course, if the screw terminal was intended to be used in any switch or electrical switch, it would include another adequate functional part. Such a functional part could for example be a metal tongue carrying a fixed contact grain.

As shown in Figure 1, the metal body 10 of each screw terminal 1 comprises for this purpose two tabs 32 folded towards one another forming two hair pins whose free end portions delimit between them receiving cell 31.

Thanks to their hairpin shape, the tongues 32 each comprise a bend which forms a pivoting hinge of said free end acting as the jaw of a clamp for clamping the pin introduced into the receiving cavity 31.

In the first part 2 of the screw terminal 1, the metal body 10 is a U-shaped rectangular plate, which delimits two parallel branches 11, 12 and a base 13 (see Figure 1). The base 13 is traversed by the threaded body 22 of the clamping screw 20 whose head 21 is accessible above the base 13.

The threaded body 22 of the clamping screw 20 is screwed into a nut 23 located behind the base 13, at a distance therefrom. The nut 23 has a generally rectangular shape which extends facing the base 13 of the metal body 10, between the two branches 11, 12 of said metal body 10 so that two opposite lateral sides of the nut 23 abut the two branches 11, 12 of the metal body 10. In this way, the nut 23 can not rotate when tightening the clamping screw 20.

During the tightening of the clamping screw 20, the nut 23 rises progressively along the threaded body 22 of the clamping screw 20, in the direction of the base 13.

The two parallel branches 11, 12 of the metal body 10, the base 13 of said metal body 10 and the nut 23 delimit between them a cavity (or cage) 15 intended to receive, via an inlet opening 16, the cores metal 51 stripped of two electrical wires 50.

More precisely, as represented in FIGS. 1 and 2, the clamping screw 20 passing through the base 13 of the metal body 10 separates the cavity 15 into two parts, each being adapted to receive, via a clean inlet opening, the metal core 51 stripped of an electric wire 50.

As shown in Figures 2, 4 and 6 to 8, the metal core 51 stripped of the electrical wire 50 is inserted into a portion of the cavity 15 via the inlet opening 16 along an axis Y of passage of the electrical wire 50 , generally perpendicular to the axis X screwing the clamping screw 20. The screwing operation then allows to sandwich the metal core 51 stripped of each of the electrical son 50, between the front face of the nut 23 and the rear face of the base 13 of the metal body 10, in order to establish an electrical connection.

Remarkably, there is provided, in the immediate vicinity of said inlet opening 16 in the cavity 15, a holding member 40; 140; 240 for receiving a portion of the insulating sheath 52 of each electrical wire 50 (see Figures 2 to 5).

Very advantageously, when a user introduces an electrical wire 50 into the cavity 15 of the metal body 10, he can use the holding element 40; 140; 240 to hold the wire in place in said cavity 15 while tightening the clamping screw 20.

By "immediate proximity" is meant that the holding member 40; 140; 240 is very close to the cavity 15 of the screw terminal 1.

For example, the holding member 40; 140; 240 is placed less than 1 cm from the inlet opening 16 of said cavity 15.

This holding member 40; 140; 240 is molded in a plastics material.

Here, the holding member 40; 140; 240 has just formed with the base 100 of the apparatus mechanism 1000.

As shown in Figures 2 to 5, this holding member 40; 140; 240 is positioned to partially close or cover the inlet opening 16 in the cavity 15 of the screw terminal 1.

More specifically, the holding member 40; 140; 240 comprises a receiving housing 41; 141; 241 of the insulating sheath 52 of an electrical wire 50, accessible by a flared entry 42; 142; 242 whose section decreases to a throttling zone 43; 143; 243.

Here, the cavity 15 of the screw terminal 1 is separated into two parts accessible by two inlet openings 16, the holding member 40; 140; 240 has two receiving houses 41; 141; 241, accessible by two flared entrances 42; 142; 242, each receiving the insulating sheath 52 of an electrical wire 50 introduced into one of said parts of the cavity 15 (see Figure 4).

The reception housing 41; 141; 241 of said holding member 40; 140; 240 advantageously has a cradle shape with a rounded bottom adapted to fit at least in part the shape of the insulating sheath 52 of the electric wire 50.

As shown in Figures 3, 4 and 5, each receiving housing 41; 141; 241 of the holding member 40; 140; 240 is delimited, on one side, by a tab 44; 144; 244 adapted to slightly flex elastically to move away from an original position to expand said throttling area 43; 143; 243.

This tab 44; 144; 244 extends generally along an axis parallel to the axis X of screwing the clamping screw 20. It is located in a peripheral region of the holding member 40; 140; 240.

By deflection of the tab 44; 144; 244, outwardly of said holding member 40; 140; 240, the choke zone 43; 143; 243 can expand temporarily (see Figure 2), which facilitates the insertion of the electrical wire 50 in the receiving housing 41; 141; 241.

More specifically, when a user wishes to connect an electrical wire 50 in the screw terminal 1, he positions the stripped portion of his metal core 51 in the cavity 15 so that a portion of its insulating sheath 52 is located at the flared entrance 42; 142; 242 of the receiving housing 41; 141; 241.

It then exerts pressure on said electric wire 50 towards the receiving housing 41; 141; 241, so as to force the tab 44; 144; 244 to bend outwardly of the holding member 40; 140; 240.

By this action, the throttling zone 43; 143; 243 widens sufficiently that the insulating sheath 52 of the electrical wire 50 can penetrate into said receiving housing 41; 141; 241.

The tab 44; 144; 244 flexed tends to return to its original position, that is to say the position in which it is at rest, which pinches the insulating sheath 52 of the electrical wire 50 in the receiving housing 41; 141; 241.

In particular, in the case where an electric wire 50 of large section is used (see Figure 7), once the insulating sheath 52 of the electrical wire 50 introduced into the receiving housing 141, the tab 144 remains bent outwardly while by compressing the insulating sheath 52 of said electrical wire 50 to prevent it from coming out of the receiving housing 141.

FIGS. 3, 4 and 5 respectively show a first, a second and a third embodiment of the holding element 40; 140; 240 of the screw terminal 1 according to the invention.

According to the first embodiment (Figure 3), the receiving housing 41 is delimited on one side by the tab 44, and on the other by a pillar 45 rigid, that is to say not able to flex elastically .

The pillar 45 extends along an axis parallel to that of the tab 44, in a central region of the holding element 40.

According to the second and third embodiments (FIGS. 4 and 5), the receiving housing 141; 241 is delimited by the tab 144; 244, and by another tab 146; 246.

Here, the other leg 146; 246 is disposed in a central region of the holding member 140; 240, opposite the tab 144; 244 main relative to the flared entrance 142; 242.

Said tabs 144, 146; 244, 246 are adapted to move away from each other during insertion of the insulating sheath into the receiving housing 41; 141; 241.

In other words, the two tabs 144, 146; 244, 246 are each adapted to slightly flex elastically to deviate from their original position to widen the throttling area 143; 243.

Furthermore, according to the third embodiment (FIG. 5), the bottom of the receiving housing 241 is extended by a channel 247 which extends on either side of the main body of the holding element 240, generally according to the y-axis of passage of the electrical wire 50,

This channel 247 thus serves as a guide for the user to introduce the electrical wire 50 into the cavity 15 of the screw terminal 1.

Whatever the embodiment envisaged, the flared entry 42; 142; 242 providing access to said receiving housing 41; 141; 241 of the holding member 40; 140; 240 has a section which decreases towards the bottom of the receiving housing 41; 141; 241.

More specifically, the flared entry 42; 142; 242 here has a truncated V-shaped section formed by two oblique cut-away faces Cl of the tabs 44; 144, 146; 244, 246 and / or the pillar 45 of the holding member 40; 140; 240.

These cut flanges Cl approach one another towards the bottom of the receiving housing 41; 141; 241 to the throttling zone 43; 143; 243 which forms the narrowest passage to access the receiving housing 41; 141; 241.

According to the example shown, the throttling zone 43; 143; 243 first comprises a bottleneck 43A; 143A; 243A of constant section, then a portion 43B; 143B; 243B whose section increases linearly towards the bottom of the receiving housing 41; 141; 241 of the holding member 40; 140; 240 (see FIGS. 2, 3 and 5).

Thus, the bottleneck 43A; 143A; 243A opens on one side on the flared entry 42; 142; 242, and the other on the receiving housing 41; 141; 241, via portion 43B; 143B; 243B. This portion 43B; 143B; 243B is formed by two other cut-off sides C2 of the tabs 44; 144, 146; 244, 246 and / or pillar 45.

Alternatively, it could be envisaged that the throttling zone is simply a throttling tip formed directly by the contact of the cut flaps of the flared inlet and the other cut flaps of the flaps.

Advantageously, in the case where an electrical wire 50 of small section is used (see FIG. 6), the insulating sheath 52 of the electrical wire 50 is held in the receiving housing 41; 141; 241 by the portion 43B; 143B; 243B of the throttling zone 43; 143; 243, that is to say by the cut edges C2 which form slopes preventing said electric wire 50 out of said receiving housing 41; 141; 241.

According to another particularly advantageous feature of the invention, it is also provided in the immediate vicinity of said inlet opening 16 of the cavity 15 of the screw terminal 1, on either side of the Y axis of passage of each electrical wire 50, two edges 60; 160; 260 which each comprise a tapered zone of engagement in the insulating sheath 52 of said electrical wire 50.

It is thus expected two menses 60; 160; 260 corresponding to each receiving housing 41; 141; 241 of the holding member 40; 140; 240 so as to form pairs of edges, each pair of bites being adapted to act on the electrical wire 50 received by the receiving housing 41; 141; 241 corresponding.

Here, the mords 60; 160; 260 are molded in a plastics material. They come from formation with the base 100 of the equipment mechanism 1000.

As shown in FIGS. 3, 4 and 5, the stubs 60; 160; 260 take action on the insulating sheath 52 of the electrical wire 50 to prevent the metal core 51 stripped of the electrical wire 50 from slipping out of the cavity 15 when the latter is not yet compressed between the nut 23 and the base 13 of the metal body 10.

These menses 60; 160; 260 may be positioned at different locations along the y-axis of passage of the electrical wire 50.

More specifically, there is shown in Figures 3 to 5 a first, a second and a third embodiment of the mords 60; 160; 260.

According to the first and third embodiments shown in Figures 3 and 5, the mords 60; 260 are offset relative to the holding member 40; 240, in the direction of the inlet opening 16 of the cavity 15 of the screw terminal 1, along said y-axis of passage of the electric wire 50.

These menses 60; 260 are arranged to the right of each receiving housing 41; 261 of the holding member 40; 240.

They are here borne by a part of the equipment support 200 disposed between the holding member 40; 240 and the inlet opening 16 of the cavity 15 of the screw terminal 1.

In practice, when the electrical wire 50 is inserted into the cavity 15 of the screw terminal 1, it first meets the holding member 40; 240, then the mords 60; 260. Nevertheless, for ease of assembly, the electrical wire 50 may be introduced slightly inclined into the cavity 15, so that the insulating sheath 52 of the electrical wire 50 will first be pushed in force through the bites. 60; 260, then push force, or clipped, in the holding member 40; 240.

According to these first and third embodiments, the holding member 40; 240 and the mords 60; 260 each exert their retaining action on a different portion of the insulating sheath 52 of the electrical wire 50, the mords 60; 260 exerting an action on a portion of the insulating sheath 52 located towards the inside of the cavity 15 of the screw terminal 1 with respect to the portion of the insulating sheath 52 on which the holding element 40 acts; 240.

According to the second embodiment shown in FIG. 4, the bites 160 are supported by the holding element 140.

In practice, when the electrical wire 50 is inserted into the cavity 15 of the screw terminal 1, it simultaneously encounters the holding member 140 and the bites 160. For ease during assembly, the electric wire 50 may be introduced slightly inclined in the cavity 15. Thus, the stripped core 51 of the electrical wire 50 will reach the cavity 15 before the insulating sheath 52 of said electrical wire 50 is pushed in force or clipped simultaneously into the holding element 140 and the bites 160.

Specifically, the bites 160 are here positioned in the receiving housing 141 of said holding member 140 so that said menses 161 and the holding member 140 each exert their action on the same portion of the insulating sheath 52 of the electrical wire 50 .

Here, said lugs 160 are formed with the holding member 140.

Whatever the embodiment envisaged, the stitches 60; 160; 260 are combined with the holding member 40; 140; 240, to reinforce the maintenance of the metal core 51 of said electrical wire 50 in the cavity 15 of the screw terminal 1 during the screwing of the clamping screw 20.

As shown in FIGS. 3 to 5 and 9, the stubs 60; 160; 260 of each pair of snips 60; 160; 260 are positioned facing each other with respect to the y-axis of passage of the electric wire 50 in the cavity 15 of the screw terminal 1.

They have a generally elongated shape perpendicular to the Y axis of passage of the electrical wire 50, here along an axis parallel to the axis X of screwing of the clamping screw 20.

As shown in FIGS. 3 to 5 and 9, the tapered tap area of each bead 60; 160; 260 is formed by a ridge 61; 161 A, 161 B; 261 rectilinear.

According to the first embodiment (see Figure 3), each bead 60 is formed by a prism 62 triangular base. This prism 62 has an outer face F facing the holding member 40 and an inner face facing the interior of the cavity 15. These inner and outer faces form an acute angle between them. The edge 61 forming the tapered zone of the bead 60 is located at the junction between the outer face F and the inner face of each prism 62.

Advantageously, in this first embodiment, the faces of each prism 62 are oriented so that they allow the introduction of the electrical wire 50 into the cavity 15 of the screw terminal 1. The edge 61 that they form between them prevents the sliding of said electrical wire 50 from said cavity 15, in a direction opposite to the insertion direction. For this purpose, the prisms 62 forming the edges 60 point towards each other. The edges 61 then extend parallel opposite each other, on either side of the y-axis of passage of the electrical wire 50.

In addition, the inner face of each prism 62 extends here perpendicular to the y-axis of passage of the electrical wire 50, and the outer face F of each prism 62 is here inclined with respect to this y-axis of passage of the electric wire. 50. The inclination of the outer face F of the prism 62 promotes the introduction of the electrical wire 50 into the cavity 15 of the screw terminal 1.

In a variant, the two faces of the prism have any orientation with respect to the y-axis of passage of the electrical wire 50.

In practice, when the user tries to introduce the metal core 51 stripped of the electrical wire 50 into the cavity 15 of the screw terminal 1, the insulating sheath 52 of said electrical wire 50 meets the outer face F of each bead 60. L The user then presses in the insertion direction of said electrical wire 50 so that the insulating sheath 52 of the electrical wire 50 deforms so as to pass between the ribs 60.

In doing so, the metal core 51 stripped of the electrical wire 50 is then introduced into the cavity 15 of the screw terminal 1. The edge 61 of each bead 60 sinks into the insulating sheath 52 of the electrical wire 50 so as to take hold of it. The electrical wire 50 is then held in place with its metal core 51 stripped sufficiently into the cavity 15 of the screw terminal 1 the time that the user screws the clamping screw 20.

According to the second embodiment (see FIG. 4), each bead 160 is formed by a first fin 160A and a second fin 160B, carried by the corresponding lug 144 of the holding element 140, inside the receiving housing. 141.

The first fin 160A has a first straight edge 161A and the second fin 160B has a second straight edge 161B.

These first and second fins 160A, 160B are arranged side by side along the y-axis of passage of the electrical wire 50 in the cavity 15. The first and second edges 161A, 161B extend parallel to one another. other.

Each fin 160A, 160B is formed here of a parallel-faced blade whose free edge forms the edge 161A, 161B of bite 160.

The free edges of the blades forming the first fins 160A of each bit of a pair of bites and the free edges of the blades forming the second fins 160B of each bit of a pair of bites extend in opposite vis-à-vis others, parallel.

Alternatively, each fin could be formed by a prism similar to those described in the first embodiment.

According to this second embodiment, said struts 160 come into contact with the insulating sheath 52 of the electrical wire 50 when the latter is pushed into the receiving housing 141 of the holding element 140. Each edge 161 A, 161B of each fin 160A, 160B then sinks into said insulating sheath 52 and acts as a claw preventing slipping of the electrical wire 50 from the holding member 140.

The third embodiment (Fig. 5) is similar to the first embodiment except that each bead 260 is formed by two prisms 260A, 260B stacked one on the other, each having a different triangular base. The edge 261 forming the tapered zone of engagement in the insulating sheath of the electric wire then has a first portion 261 A, coming from the first prism 260A, and a second portion 261 B, coming from the second prism 260B.

The second portion 261B of the edge 261 is slightly set back relative to the first portion 261A of the edge 261, so that said edge 261 has a drop.

Advantageously, the distance separating the first portions 261A from the ridges 261 of a pair of mounds 260 is adapted so that said pair of menses 260 act on the insulating sheaths 52 of the electrical wires 50 of small sections.

Similarly, the distance separating the second portions 261B from the ridges 261 of a pair of stubs 260 is adapted so that said pair of stubs 260 act on the insulating sheaths 52 of the electrical wires 50 of large sections.

Thus, the ribs 260 are adapted to retain in the cavity 15 of the screw terminal 1 both the electrical son 50 having a small section or those having a large section.

Of course, the various embodiments of the mords 60; 160; 260 can be combined without difficulty to different embodiments of the holding member 40; 140; 240.

The dimensions of the holding member 40; 140; 240 as well as those of mords 60; 160; 260 can be easily adapted by anyone skilled in the art depending on the size of the screw terminal used, and the electric wires used.

Claims (11)

An electrical connection screw terminal (1) comprising a metal body (10) defining a cavity (15) for receiving via an inlet opening (16) an end of the stripped metal core (51). at least one electrical wire (50), and a clamping screw (20) passing through said metal body (10), characterized in that, in the immediate vicinity of said inlet opening (16), a holding element (40; 140; 240) which comprises at least one receiving housing (41; 141; 241) of a portion of the insulating sheath (52) of each electrical wire (50) accessible through a flared entry ( 42; 142; 242) whose section decreases to a throttling zone (43; 143; 243). An electric screw terminal (1) according to claim 1, wherein each receiving housing (41; 141; 241) of the holding member (40; 140; 240) is delimited on one side, by a tab (44; 144; 244) adapted to flex to move away from an original position to expand said throttling area (43; 143; 243). 3. Screw terminal (1) for electrical connection according to one of claims 1 and 2, wherein each receiving housing (141; 241) of the holding member (140; 240) is delimited by two tabs (144). , 146, 244, 246) arranged facing each other with respect to the flared entry (142; 242) and adapted to move away from each other. An electrical connection screw terminal (1) according to one of claims 1 to 3, wherein the holding element (40; 140; 240) is molded in a plastic polymeric material. An electrical connection screw terminal (1) according to one of claims 1 to 4, wherein each receiving housing (41; 141; 241) of the holding member (40; 140; 240) has a shape cradle with a rounded bottom adapted to the shape of the insulating sheath (52) of said electric wire (50). An electrical connection screw terminal (1) according to one of claims 1 to 5, wherein the section of the flared inlet (42; 142; 242) decreases to the throttling area (43; 243) which has a constant section and then a section which increases linearly. 7. screw terminal (1) for electrical connection according to one of claims 1 to 6, wherein it is provided in the immediate vicinity of said inlet opening (16) of the cavity (15), on the one hand and another of an axis (Y) of passage of the electric wire (50), two edges (60; 160; 260) which each comprise a tapered zone of engagement in the insulating sheath (52) of said electric wire (50). An electrical connection screw terminal (1) according to claim 7, wherein, along said passage axis (Y), said bores (60; 260) are offset from the holding member ( 40; 240). An electrical connection screw terminal (1) according to claim 7, wherein said nips (160) are positioned in the receiving housing (141) of said holding member (140). 10. Apparatus mechanism (1000) comprising an insulating base (100) enclosing a functional part connected to an electrical connection part, characterized in that the electrical connection part comprises at least two screw terminals (1) according to the any of the preceding claims. 11. Electrical apparatus comprising an equipment support (200), an equipment mechanism (1000) according to the preceding claim which is secured to said equipment support (200), and a hubcap (300) which is attached to the front of the base (100) of said equipment mechanism (1000).