EP0462879A1 - Coupling element for a coaxial cable on contact pin and set of these coupling elements - Google Patents

Coupling element for a coaxial cable on contact pin and set of these coupling elements Download PDF

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Publication number
EP0462879A1
EP0462879A1 EP91401609A EP91401609A EP0462879A1 EP 0462879 A1 EP0462879 A1 EP 0462879A1 EP 91401609 A EP91401609 A EP 91401609A EP 91401609 A EP91401609 A EP 91401609A EP 0462879 A1 EP0462879 A1 EP 0462879A1
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EP
European Patent Office
Prior art keywords
shape memory
core
sockets
state
connection element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP91401609A
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German (de)
French (fr)
Inventor
Michel De Mendez
Jean Riverie
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FCI France SA
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Souriau et Cie
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Filing date
Publication date
Application filed by Souriau et Cie filed Critical Souriau et Cie
Publication of EP0462879A1 publication Critical patent/EP0462879A1/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0518—Connection to outer conductor by crimping or by crimping ferrule
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/01—Connections using shape memory materials, e.g. shape memory metal
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R9/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, e.g. terminal strips or terminal blocks; Terminals or binding posts mounted upon a base or in a case; Bases therefor
    • H01R9/03—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections
    • H01R9/05—Connectors arranged to contact a plurality of the conductors of a multiconductor cable, e.g. tapping connections for coaxial cables
    • H01R9/0512—Connections to an additional grounding conductor

Definitions

  • the present invention relates to a connection element between, on the one hand, a coaxial cable comprising a central core and an outer braid, and, on the other hand, a first and a second contact pin. It also relates to a set of such connection elements.
  • the invention advantageously applies to the general technical field of electrical connections.
  • connection between a coaxial cable and contact pins constituting, for example, the rear parts of a connector contact through a card
  • the connection between the central core of the cable and one of the contact pins can be carried out quite easily by soldering or crimping
  • the connection of the ground braid to the second contact pin is much less easy to carry out since it is necessary, not only to strip the cable, but also to untwist the strands of the braid, then to bring them together in a single conductor which must then be welded on said second pin, or to come solder on the braid a short length of an auxiliary conductor.
  • the connection thus obtained does not lend itself easily to frequent disassembly and reassembly.
  • connection element in accordance with the preamble, which would be easy to use, quick and safe and also removable and reassemblable as many times as necessary and without wear. excessive.
  • said connecting element consists of a core ferrule and a mass ferrule, each made of a conductive material with shape memory, and shaped so as to be able to adapt closely, in a first state of shape memory, respectively to said central core and to said outer braid and to be able to ensure the release and / or the engagement of said core ferrules and mass in a second shape memory state, the core and mass ferrules being respectively connected to a first and a second sockets intended to ensure the electrical connection and the mechanical cohesion respectively with said first and said second contact pins .
  • the connecting element, object of the invention comprises two parts, a core ferrule and a mass ferrule which can be easily connected, on the one hand, to the central core and, on the other hand , to the outer braid after the cable has been stripped.
  • the ferrules below the transition temperature of the conductive material with shape memory, that is to say in the martensitic phase, to engage the ferrules respectively on the core and on the braid, then, by increasing the temperature, passing the material into its austenitic phase where, by effect of shape memory, the ferrules of core and braid resume their first state of shape, that is to say say the one that provides the best electrical and mechanical contact.
  • the ferrules are again brought to a temperature below the transition temperature, in the martensitic phase, then disconnected from the central core and from the outer braid.
  • the transition temperature in the martensitic phase, then disconnected from the central core and from the outer braid.
  • there is therefore a coaxial cable which has been provided in a very simple, rapid and effortless manner with ferrules which can be assembled and dismantled at will, terminated by sockets easily. connectable to contact pins.
  • connection element object of the invention, it is provided that at least one of said sockets is made of a conductive material with shape memory, and shaped so as to be able to adapt closely , in a first state of shape memory, to one of said contact pins and to be able to ensure the release and / or the engagement of said socket in a second state of shape memory.
  • an increase in temperature is carried out which brings the various components of the connection element endowed with shape memory into their first shape memory state corresponding to the optimum contact.
  • the shape memory materials constituting the connection element according to the invention were different, it would be advisable that at operating temperature, for example ambient temperature, all the materials be in the austenitic phase in order to all shape memory components are in their first shape memory state.
  • the martensitic transition temperatures can be different so as to be able, if necessary, to disengage the sockets from the contact pins without at the same time disengaging the core and braid ferrules. In this case, the martensitic transition temperature of the ferrules should be lower than that of the sleeves.
  • the transition from the first shape memory state to the second shape memory state is effected in a reversible manner simply by crossing the transition temperature of said shape memory material, which it be the material constituting the ferrules and, where appropriate, the sockets.
  • connection elements according to the invention is remarkable in that the first and second sockets are held in the same insulating housing. This arrangement makes it possible to provide the various connection elements with the solidarity necessary for the easy use of said assembly.
  • Figure 1 is a perspective view of a connecting element according to the invention.
  • Figure 2 is a perspective view of a split socket used in the invention.
  • Figure 3 is a perspective view of a clip socket used in the invention.
  • Figure 4 is a front view of a set of connecting elements according to the invention, held in an insulating housing.
  • Figure 1 shows in perspective a connecting element between, on the one hand, a coaxial cable 10 and, on the other hand, a first 21 and a second 22 contact pins.
  • the coaxial cable 10 comprises a central core 11 and an outer braid 12.
  • the core 11 and the braid 12 are intended respectively to be connected to the contact pins 21 and 22.
  • These contact pins can be rear parts of a contact passing through a card 50, or even through pins of the pressfit or soldering type.
  • the connecting element of Figure 1 consists of a ferrule 31 of core and a ferrule 32 of mass, each made of a conductive material with shape memory, and shaped so as to be able to adapt closely, in a first state of shape memory, respectively to said central core 11 and to said outer braid 12 and to be able to ensure the release and / or the engagement of said core and mass ferrules in a second state of shape memory form.
  • the ferrules 31, 32 will, in their first state of shape memory, in the austenitic phase, at the operating temperature of the connection element, that is to say for example at the usual ambient temperature .
  • the transition to the second shape memory state in which the ferrules are engaged on or disengaged from the core 11 and the braid 12 of the coaxial cable 10, is then obtained by decreasing the temperature below the transition temperature shape memory material, in martensitic phase.
  • the release of the ferrule 31 of the core and of the ferrule 32 of mass in the martensitic state can be carried out with a weak force exerted either manually, or using an elastic return member whose action is canceled and overcome by the shape memory effect when returning to the austenitic phase.
  • said release can also be carried out at zero force when the transition from the first to the second shape memory state is effected in a reversible manner simply by crossing the transition temperature of the conductive shape memory material.
  • This mode of operation requires subjecting the ferrets of soul and mass to an education process described in European patent application No. 86 400 560.8, and the general principles of which are given in European patent application No. 85 400 523.8.
  • the ferrules 31, 32 of core and of mass are connected respectively to a first 41 and a second 42 sockets intended to ensure electrical connection and mechanical cohesion respectively with said first 21 and said second 22 contact pins.
  • the sleeve 41 is directly connected to the ferrule 31 of the core, while the sleeve 42 is connected to the ferrule 32 of mass by means of a connecting lug 52.
  • the sockets 41 and 42 are sockets of the "split socket" type, shown in FIG. 2, and comprising a slot extending only partially over the length of said sockets.
  • the material constituting the split bushings may be different from the shape memory material in which the ferrules are made, but for reasons of simplification, it will preferably be taken identical.
  • the sockets 41 and 42 are made of a conductive shape memory material, and shaped so as to be able to adapt closely, in a first shape memory state, to one of said pins 21, 22 contact and able to ensure the release and / or engagement of said sockets 41, 42 in a second state of shape memory.
  • the shape memory materials used to form the ferrules 31, 32 of core and mass, on the one hand, and the sockets 41, 42, on the other hand, can be identical, and, in this case, the operations engagement and disengagement are carried out at the same temperature for all components of the connection element, ferrules and sockets.
  • said shape memory materials can be different, that is to say have different transition temperatures, with the advantage of being able to dissociate, if desired, the operations of engagement and disengagement of the ferrules from those of the sockets.
  • the passage of the sockets 41, 42 from the first to the second state of shape memory can be carried out, in a nonlimiting manner, in a reversible manner simply by crossing the transition temperature of the shape memory material.
  • FIG. 1 shows that the ferrules 31 and 32 as well as, possibly, the sockets, here the socket 42, can each be constituted, in the first state of shape memory, by a substantially tubular element comprising a slot s 'extending substantially over its entire length.
  • a socket of this type called clip socket is shown in Figure 3. This particular embodiment of the active part of the ferrules and sockets, as well as the corresponding educational process, are described in detail in the patent application. European No. 86 400 560.8.
  • Figure 4 shows a set of connection elements, similar to that shown in Figure 1, in the case where a plurality of pairs of contact pins 21, 22 must be connected to a plurality of coaxial cables 10. As can be see in Figure 4, it is then expected that the sockets 41 and 42 are held in the same insulating housing 60 so as to allow placement and overall manipulation of all the connecting elements.
  • the shape memory material is chosen from the group of nickel-titanium, nickel-aluminum, nickel-titanium-iron, copper-zinc-aluminum, copper-aluminum-nickel compounds in the form of an intermetallic compound or under allied form.
  • a connection element in accordance with the object of the present invention has been produced from an alloy comprising substantially 4% aluminum, 28% zinc, the rest of the percentage being constituted by copper, the percentages given being understood as a percentage by weight.
  • the transition temperature obtained with this type of alloy is close to -80 ° C.

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  • Coupling Device And Connection With Printed Circuit (AREA)

Abstract

Element for coupling between, on the one hand, a coaxial cable (10) comprising a central core (11) and an outer braid (12) and, on the other hand, a first (21) and a second (22) contact pin. <??>According to the invention, the coupling element consists of a core ferrule (31) and of an earth ferrule (32) which are made from a conductive shape-memory material and shaped so as to be able to match closely, in a first shape-memory state, the central core (11) and the outer braid (12) and to be able to release and/or engage the core and earth ferrules (31, 32) in a second shape-memory state, the core and earth ferrules (31, 32) being connected to a first (41) and a second (42) socket, which sockets are intended for providing the electrical connection and the mechanical cohesion with the contact pins. <??>Application to electrical connections. <IMAGE>

Description

La présente invention concerne un élément de raccordement entre, d'une part, un câble coaxial comprenant une âme centrale et une tresse extérieure, et, d'autre part, une première et une deuxième broches de contact. Elle concerne également un ensemble de tels éléments de raccordement.The present invention relates to a connection element between, on the one hand, a coaxial cable comprising a central core and an outer braid, and, on the other hand, a first and a second contact pin. It also relates to a set of such connection elements.

L'invention s'applique de façon avantageuse au domaine technique général des connexions électriques.The invention advantageously applies to the general technical field of electrical connections.

Le raccordement électrique entre un câble coaxial et des broches de contact, constituant, par exemple, les parties arrière d'un contact de connecteur à travers une carte, est une opération relativement délicate à exécuter. En effet, si la liaison entre l'âme centrale du câble et une des broches de contact peut être réalisée assez facilement par soudure ou sertissage, par contre, le raccordement de la tresse de masse à la deuxième broche de contact est beaucoup moins aisé à effectuer puisqu'il est nécessaire, non seulement de dénuder le câble, mais également de détresser les brins de la tresse, puis de les rassembler dans un conducteur unique qu'il faut ensuite souder sur ladite deuxième broche, ou de venir souder sur la tresse une petite longueur d'un conducteur auxiliaire. Il en découle une manipulation fastidieuse et coûteuse en temps pour un résultat qui n'est guère satisfaisant. D'autre part, le raccordement ainsi obtenu ne se prête pas facilement au démontage et au remontage fréquents.The electrical connection between a coaxial cable and contact pins, constituting, for example, the rear parts of a connector contact through a card, is a relatively delicate operation to perform. Indeed, if the connection between the central core of the cable and one of the contact pins can be carried out quite easily by soldering or crimping, on the other hand, the connection of the ground braid to the second contact pin is much less easy to carry out since it is necessary, not only to strip the cable, but also to untwist the strands of the braid, then to bring them together in a single conductor which must then be welded on said second pin, or to come solder on the braid a short length of an auxiliary conductor. This results in a tedious and time-consuming manipulation for an unsatisfactory result. On the other hand, the connection thus obtained does not lend itself easily to frequent disassembly and reassembly.

Aussi, le problème technique à résoudre par l'objet de la présente invention est de réaliser un élément de raccordement conforme au préambule, qui serait de mise en oeuvre aisée, rapide et sûre et également démontable et remontable autant de fois que nécessaire et sans usure excessive.Also, the technical problem to be solved by the object of the present invention is to provide a connection element in accordance with the preamble, which would be easy to use, quick and safe and also removable and reassemblable as many times as necessary and without wear. excessive.

La solution au problème technique posé consiste, selon la présente invention, en ce que ledit élément de raccordement est constitué d'une férule d'âme et d'une férule de masse, réalisées, chacune, en un matériau conducteur à mémoire de forme, et conformées de façon à pouvoir s'adapter étroitement, dans un premier état de mémoire de forme, respectivement à ladite âme centrale et à ladite tresse extérieure et à pouvoir assurer le dégagement et/ou l'engagement desdites férules d'âme et de masse dans un deuxième état de mémoire de forme, les férules d'âme et de masse étant respectivement reliées à une première et une deuxième douilles destinées à assurer la connexion électrique et la cohésion mécanique respectivement avec ladite première et ladite deuxième broches de contact.The solution to the technical problem posed consists, according to the present invention, in that said connecting element consists of a core ferrule and a mass ferrule, each made of a conductive material with shape memory, and shaped so as to be able to adapt closely, in a first state of shape memory, respectively to said central core and to said outer braid and to be able to ensure the release and / or the engagement of said core ferrules and mass in a second shape memory state, the core and mass ferrules being respectively connected to a first and a second sockets intended to ensure the electrical connection and the mechanical cohesion respectively with said first and said second contact pins .

Ainsi, l'élément de raccordement, objet de l'invention, comprend deux parties, une férule d'âme et une férule de masse qui peuvent être facilement connectées, d'une part, à l'âme centrale et, d'autre part, à la tresse extérieure après que le câble ait été dénudé. Pour cela, il suffit d'amener les férules au-dessous de la température de transition du matériau conducteur à mémoire de forme, c'est-à-dire dans la phase martensitique, d'engager les férules respectivement sur l'âme et sur la tresse, puis, par augmentation de la température, de faire passer le matériau dans sa phase austénitique où, par effet de mémoire de forme, les férules d'âme et de tresse reprennent leur premier état de forme, c'est-à-dire celui qui assure le meilleur contact électrique et mécanique. Pour dégager du câble coaxial l'élément de raccordement selon l'invention, les férules sont à nouveau portées à une température inférieure à la température de transition, en phase martensitique, puis déconnectées de l'âme centrale et de la tresse extérieure. A l'état de fonctionnement, au-dessus de la température de transition, on dispose donc d'un câble coaxial qui a été muni de façon très simple, rapide et sans effort de férules montables et démontables à volonté, terminées par des douilles facilement connectables aux broches de contact.Thus, the connecting element, object of the invention, comprises two parts, a core ferrule and a mass ferrule which can be easily connected, on the one hand, to the central core and, on the other hand , to the outer braid after the cable has been stripped. For this, it suffices to bring the ferrules below the transition temperature of the conductive material with shape memory, that is to say in the martensitic phase, to engage the ferrules respectively on the core and on the braid, then, by increasing the temperature, passing the material into its austenitic phase where, by effect of shape memory, the ferrules of core and braid resume their first state of shape, that is to say say the one that provides the best electrical and mechanical contact. To disengage the connection element according to the invention from the coaxial cable, the ferrules are again brought to a temperature below the transition temperature, in the martensitic phase, then disconnected from the central core and from the outer braid. In the operating state, above the transition temperature, there is therefore a coaxial cable which has been provided in a very simple, rapid and effortless manner with ferrules which can be assembled and dismantled at will, terminated by sockets easily. connectable to contact pins.

Dans un mode de réalisation particulier de l'élément de raccordement, objet de l'invention, il est prévu qu'au moins une desdites douilles est réalisée en un matériau conducteur à mémoire de forme, et conformée de façon à pouvoir s'adapter étroitement, dans un premier état de mémoire de forme, à une desdites broches de contact et à pouvoir assurer le dégagement et/ou l'engagement de ladite douille dans un deuxième état de mémoire de forme. De cette manière, après avoir engagé l'âme et la tresse respectivement dans la férule d'âme et la férule de masse ainsi que les broches de contact dans les douilles, au-dessous de la température de transition la plus basse, il est procédé à une augmentation de la température qui amène les différents composants de l'élément de raccordement doués de mémoire de forme dans leur premier état de mémoire de forme correspondant au contact optimum. Il est bien entendu que, si les matériaux à mémoire de forme constituant l'élément de raccordement selon l'invention étaient différents, il conviendrait qu'à la température de fonctionnement, la température ambiante par exemple, tous les matériaux soient en phase austénitique afin que tous les composants à mémoire de forme soient dans leur premier état de mémoire de forme. Par contre, les températures de transition martensitique peuvent être différentes de façon à pouvoir, si cela était nécessaire, dégager les douilles des broches de contact sans dégager en même temps les férules d'âme et de tresse. Dans ce cas, la température de transition martensitique des férules devrait être inférieure à celle des douilles.In a particular embodiment of the connection element, object of the invention, it is provided that at least one of said sockets is made of a conductive material with shape memory, and shaped so as to be able to adapt closely , in a first state of shape memory, to one of said contact pins and to be able to ensure the release and / or the engagement of said socket in a second state of shape memory. In this way, after having engaged the core and the braid respectively in the core ferrule and the mass ferrule as well as the contact pins in the sockets, below the lowest transition temperature, an increase in temperature is carried out which brings the various components of the connection element endowed with shape memory into their first shape memory state corresponding to the optimum contact. It is understood that, if the shape memory materials constituting the connection element according to the invention were different, it would be advisable that at operating temperature, for example ambient temperature, all the materials be in the austenitic phase in order to all shape memory components are in their first shape memory state. On the other hand, the martensitic transition temperatures can be different so as to be able, if necessary, to disengage the sockets from the contact pins without at the same time disengaging the core and braid ferrules. In this case, the martensitic transition temperature of the ferrules should be lower than that of the sleeves.

Selon une particularité avantageuse de l'invention, le passage du premier état de mémoire de forme au deuxième état de mémoire de forme est effectué de façon réversible du seul fait du franchissement de la température de transition dudit matériau à mémoire de forme, qu'il s'agisse du matériau constituant les férules et, le cas échéant, les douilles.According to an advantageous feature of the invention, the transition from the first shape memory state to the second shape memory state is effected in a reversible manner simply by crossing the transition temperature of said shape memory material, which it be the material constituting the ferrules and, where appropriate, the sockets.

Enfin, un ensemble d'éléments de raccordement selon l'invention est remarquable en ce que les premières et deuxièmes douilles sont maintenues dans un même boîtier isolant. Cette disposition permet d'assurer aux divers éléments de raccordement la solidarité nécessaire à l'utilisation facile dudit ensemble.Finally, a set of connection elements according to the invention is remarkable in that the first and second sockets are held in the same insulating housing. This arrangement makes it possible to provide the various connection elements with the solidarity necessary for the easy use of said assembly.

La description qui va suivre en regard des dessins annexés, donnés à titre d'exemples non limitatifs, fera bien comprendre en quoi consiste l'invention et comment elle peut être réalisée.The description which follows with reference to the appended drawings, given by way of nonlimiting examples, will make it clear what the invention consists of and how it can be implemented.

La figure 1 est une vue en perspective d'un élément de raccordement selon l'invention.Figure 1 is a perspective view of a connecting element according to the invention.

La figure 2 est une vue en perspective d'une douille fendue mise en oeuvre dans l'invention.Figure 2 is a perspective view of a split socket used in the invention.

La figure 3 est une vue en perspective d'une douille-clip mise en oeuvre dans l'invention.Figure 3 is a perspective view of a clip socket used in the invention.

La figure 4 est une vue de face d'un ensemble d'éléments de raccordement selon l'invention, maintenus dans un boîtier isolant.Figure 4 is a front view of a set of connecting elements according to the invention, held in an insulating housing.

La figure 1 montre en perspective un élément de raccordement entre, d'une part, un câble coaxial 10 et, d'autre part, une première 21 et une deuxième 22 broches de contact. Le câble coaxial 10 comprend une âme centrale 11 et une tresse extérieure 12. Dans l'exemple de la figure 1, l'âme 11 et la tresse 12 sont destinées respectivement à être raccordées aux broches 21 et 22 de contact. Ces broches de contact peuvent être des parties arrière d'un contact traversant une carte 50, ou bien encore des broches traversantes de type pressfit ou à souder.Figure 1 shows in perspective a connecting element between, on the one hand, a coaxial cable 10 and, on the other hand, a first 21 and a second 22 contact pins. The coaxial cable 10 comprises a central core 11 and an outer braid 12. In the example of FIG. 1, the core 11 and the braid 12 are intended respectively to be connected to the contact pins 21 and 22. These contact pins can be rear parts of a contact passing through a card 50, or even through pins of the pressfit or soldering type.

L'élément de raccordement de la figure 1 est constitué d'une férule 31 d'âme et d'une férule 32 de masse, réalisées, chacune, en un matériau conducteur à mémoire de forme, et conformées de façon à pouvoir s'adapter étroitement, dans un premier état de mémoire de forme, respectivement à ladite âme centrale 11 et à ladite tresse extérieure 12 et à pouvoir assurer le dégagement et/ou l'engagement desdites férules d'âme et de masse dans un deuxième état de mémoire de forme. De façon générale, les férules 31, 32 seront, dans leur premier état de mémoire de forme, en phase austénitique, à la température de fonctionnement de l'élément de raccordement, c'est-à-dire par exemple à la température ambiante usuelle. Le passage au deuxième état de mémoire de forme, dans lequel les férules sont engagées sur ou dégagées de l'âme 11 et de la tresse 12 du câble coaxial 10, est alors obtenu par diminution de la température au-dessous de la température de transition du matériau à mémoire de forme, en phase martensitique. Le dégagement de la férule 31 d'âme et de la férule 32 de masse à l'état martensitique peut être effectué avec une faible force exercée soit manuellement, soit à l'aide d'un organe de rappel élastigue dont l'action est annulée et surmontée par l'effet de mémoire de forme lors du retour en phase austénitique.The connecting element of Figure 1 consists of a ferrule 31 of core and a ferrule 32 of mass, each made of a conductive material with shape memory, and shaped so as to be able to adapt closely, in a first state of shape memory, respectively to said central core 11 and to said outer braid 12 and to be able to ensure the release and / or the engagement of said core and mass ferrules in a second state of shape memory form. Generally, the ferrules 31, 32 will, in their first state of shape memory, in the austenitic phase, at the operating temperature of the connection element, that is to say for example at the usual ambient temperature . The transition to the second shape memory state, in which the ferrules are engaged on or disengaged from the core 11 and the braid 12 of the coaxial cable 10, is then obtained by decreasing the temperature below the transition temperature shape memory material, in martensitic phase. The release of the ferrule 31 of the core and of the ferrule 32 of mass in the martensitic state can be carried out with a weak force exerted either manually, or using an elastic return member whose action is canceled and overcome by the shape memory effect when returning to the austenitic phase.

Toutefois, avantageusement, ledit dégagement peut être également réalisé à force nulle lorsque le passage du premier au deuxième état de mémoire de forme est effectué de façon réversible du seul fait du franchissement de la température de transition du matériau conducteur à mémoire de forme. Ce mode de fonctionnement nécessite de faire subir aux férules d'âme et de masse un procédé d'éducation décrit dans la demande de brevet européen n° 86 400 560.8, et dont les principes généraux sont donnés dans la demande de brevet européen n° 85 400 523.8.However, advantageously, said release can also be carried out at zero force when the transition from the first to the second shape memory state is effected in a reversible manner simply by crossing the transition temperature of the conductive shape memory material. This mode of operation requires subjecting the ferrets of soul and mass to an education process described in European patent application No. 86 400 560.8, and the general principles of which are given in European patent application No. 85 400 523.8.

Comme l'indique la figure 1, les férules 31, 32 d'âme et de masse sont reliées respectivement à une première 41 et une deuxième 42 douilles destinées à assurer la connexion électrique et la cohésion mécanique respectivement avec ladite première 21 et ladite deuxième 22 broches de contact. Dans l'exemple de la figure 1, la douille 41 est directement reliée à la férule 31 d'âme, tandis que la douille 42 est reliée à la férule 32 de masse par l'intermédiaire d'une patte 52 de liaison.As shown in FIG. 1, the ferrules 31, 32 of core and of mass are connected respectively to a first 41 and a second 42 sockets intended to ensure electrical connection and mechanical cohesion respectively with said first 21 and said second 22 contact pins. In the example of FIG. 1, the sleeve 41 is directly connected to the ferrule 31 of the core, while the sleeve 42 is connected to the ferrule 32 of mass by means of a connecting lug 52.

Dans un premier mode de réalisation, les douilles 41 et 42 sont des douilles du type "douille fendue", représentée sur la figure 2, et comportant une fente s'étendant en partie seulement sur la longueur desdites douilles. Le matériau constituant les douilles fendues peut être différent du matériau à mémoire de forme dans lequel sont réalisées les férules, mais pour des raisons de simplification, il sera de préférence pris identique.In a first embodiment, the sockets 41 and 42 are sockets of the "split socket" type, shown in FIG. 2, and comprising a slot extending only partially over the length of said sockets. The material constituting the split bushings may be different from the shape memory material in which the ferrules are made, but for reasons of simplification, it will preferably be taken identical.

Dans un deuxième mode de réalisation, les douilles 41 et 42 sont réalisées en un matériau conducteur à mémoire de forme, et conformées de façon à pouvoir s'adapter étroitement, dans un premier état de mémoire de forme, à une desdites broches 21, 22 de contact et à pouvoir assurer le dégagement et/ou l'engagement desdites douilles 41, 42 dans un deuxième état de mémoire de forme. Les matériaux à mémoire de forme utilisés pour constituer les férules 31, 32 d'âme et de masse, d'une part, et les douilles 41, 42, d'autre part, peuvent être identiques, et, dans ce cas, les opérations d'engagement et de dégagement s'effectuent à la même température pour tous les composants de l'élément de raccordement, férules et douilles. Bien entendu, lesdits matériaux à mémoire de forme peuvent être différents, c'est-à-dire présenter des températures de transition différentes, avec l'avantage de pouvoir dissocier, si on le désire, les opérations d'engagement et de dégagement des férules de celles des douilles.In a second embodiment, the sockets 41 and 42 are made of a conductive shape memory material, and shaped so as to be able to adapt closely, in a first shape memory state, to one of said pins 21, 22 contact and able to ensure the release and / or engagement of said sockets 41, 42 in a second state of shape memory. The shape memory materials used to form the ferrules 31, 32 of core and mass, on the one hand, and the sockets 41, 42, on the other hand, can be identical, and, in this case, the operations engagement and disengagement are carried out at the same temperature for all components of the connection element, ferrules and sockets. Of course, said shape memory materials can be different, that is to say have different transition temperatures, with the advantage of being able to dissociate, if desired, the operations of engagement and disengagement of the ferrules from those of the sockets.

Comme pour les férules d'âme et de masse, le passage des douilles 41, 42 du premier au deuxième état de mémoire de forme peut être effectué, de manière non limitative, de façon réversible du seul fait du franchissement de la température de transition du matériau à mémoire de forme.As for the ferrules of core and mass, the passage of the sockets 41, 42 from the first to the second state of shape memory can be carried out, in a nonlimiting manner, in a reversible manner simply by crossing the transition temperature of the shape memory material.

Par ailleurs, la figure 1 montre que les férules 31 et 32 ainsi que, éventuellement, les douilles, ici la douille 42, peuvent être constituées, chacune, dans le premier état de mémoire de forme, par un élément sensiblement tubulaire comportant une fente s'étendant sensiblement sur toute sa longueur. Une douille de ce type appelée douille-clip, est représentée sur la figure 3. Ce mode de réalisation particulier de la partie active des férules et des douilles, ainsi que le processus d'éducation correspondant, sont décrits en détail dans la demande de brevet européen n° 86 400 560.8.Furthermore, FIG. 1 shows that the ferrules 31 and 32 as well as, possibly, the sockets, here the socket 42, can each be constituted, in the first state of shape memory, by a substantially tubular element comprising a slot s 'extending substantially over its entire length. A socket of this type called clip socket, is shown in Figure 3. This particular embodiment of the active part of the ferrules and sockets, as well as the corresponding educational process, are described in detail in the patent application. European No. 86 400 560.8.

La figure 4 montre un ensemble d'éléments de raccordement, analogue à celui représenté sur la figure 1, dans le cas où une pluralité de paires de broches 21, 22 de contact doit être raccordée à une pluralité de câbles coaxiaux 10. Comme on peut le voir sur la figure 4, il est alors prévu que les douilles 41 et 42 sont maintenues dans un même boîtier isolant 60 de façon à permettre une mise en place et une manipulation d'ensemble de tous les éléments de raccordement.Figure 4 shows a set of connection elements, similar to that shown in Figure 1, in the case where a plurality of pairs of contact pins 21, 22 must be connected to a plurality of coaxial cables 10. As can be see in Figure 4, it is then expected that the sockets 41 and 42 are held in the same insulating housing 60 so as to allow placement and overall manipulation of all the connecting elements.

Des exemples de matériaux à mémoire de forme, susceptibles d'être utilisés pour la mise en oeuvre de la présente invention, seront maintenant donnés. De préférence, le matériau à mémoire de forme est choisi dans le groupe des composés nickel-titane, nickel-aluminium, nickel-titane-fer, cuivre-zinc-aluminium, cuivre-aluminium-nickel sous forme de composé inter-métallique ou sous forme alliée. A titre d'exemple non limitatif, un élément de raccordement conforme à l'objet de la présente invention a été réalisé à partir d'un alliage comportant sensiblement 4 % d'aluminium, 28 % de zinc, le reste du pourcentage étant constitué par du cuivre, les pourcentages indiqués s'entendant en pourcentage en poids. La température de transition obtenue avec ce type d'alliage, est voisine de -80°C.Examples of shape memory materials capable of being used for the implementation of the present invention will now be given. Preferably, the shape memory material is chosen from the group of nickel-titanium, nickel-aluminum, nickel-titanium-iron, copper-zinc-aluminum, copper-aluminum-nickel compounds in the form of an intermetallic compound or under allied form. By way of nonlimiting example, a connection element in accordance with the object of the present invention has been produced from an alloy comprising substantially 4% aluminum, 28% zinc, the rest of the percentage being constituted by copper, the percentages given being understood as a percentage by weight. The transition temperature obtained with this type of alloy is close to -80 ° C.

Claims (9)

Elément de raccordement entre, d'une part, un câble coaxial (10) comprenant une âme centrale (11) et une tresse extérieure (12), et, d'autre part, une première (21) et une deuxième (22) broches de contact, caractérisé en ce que ledit élément de raccordement est constitué d'une férule (31) d'âme et d'une férule (32) de masse, réalisées, chacune, en un matériau conducteur à mémoire de forme, et conformées de façon à pouvoir s'adapter étroitement, dans un premier état de mémoire de forme, respectivement à ladite âme centrale (11) et à ladite tresse extérieure ( 12) et à pouvoir assurer le dégagement et/ou l'engagement desdites férules (31, 32) d'âme et de masse dans un deuxième état de mémoire de forme, les férules (31, 32) d'âme et de masse étant respectivement reliées à une première (41) et une deuxième (42) douilles destinées à assurer la connexion électrique et la cohésion mécanique respectivement avec ladite première (21) et ladite deuxième (22) broches de contact.Connection element between, on the one hand, a coaxial cable (10) comprising a central core (11) and an outer braid (12), and, on the other hand, a first (21) and a second (22) pin contact, characterized in that said connecting element consists of a ferrule (31) of core and a ferrule (32) of mass, each made of a conductive material with shape memory, and shaped so as to be able to adapt closely, in a first state of shape memory, respectively to said central core (11) and to said outer braid (12) and to be able to ensure the release and / or the engagement of said ferrules (31, 32) of core and mass in a second state of shape memory, the ferrules (31, 32) of core and mass being respectively connected to a first (41) and a second (42) sockets intended to ensure the electrical connection and mechanical cohesion respectively with said first (21) and said two xth (22) contact pins. Elément de raccordement selon la revendication 1, caractérisé en ce que le passage du premier état de mémoire de forme au deuxième état de mémoire de forme est effectué de façon réversible du seul fait du franchissement de la température de transition dudit matériau conducteur à mémoire de forme.Connection element according to claim 1, characterized in that the transition from the first shape memory state to the second shape memory state is effected reversibly by the mere fact of crossing the transition temperature of said conductive shape memory material . Elément de raccordement selon l'une des revendications 1 ou 2, caractérisé en ce qu'au moins une desdites douilles (41, 42) est une douille dite "douille fendue".Connection element according to one of claims 1 or 2, characterized in that at least one of said sockets (41, 42) is a so-called "split socket". Elément de raccordement selon l'une quelconque des revendications 1 à 3, caractérisé en ce qu'au moins une desdites douilles (41, 42) est réalisée en un matériau conducteur à mémoire de forme, et conformée de façon à pouvoir s'adapter étroitement, dans un premier état de mémoire de forme, à une desdites broches (21,22) de contact et à pouvoir assurer le dégagement et/ou l'engagement de ladite douille (41, 42) dans un deuxième état de mémoire de forme.Connection element according to any one of claims 1 to 3, characterized in that at least one of said sockets (41, 42) is made of a conductive shape memory material, and shaped so as to be able to adapt closely , in a first shape memory state, to one of said contact pins (21, 22) and to be able to ensure the release and / or engagement of said socket (41, 42) in a second shape memory state. Elément de raccordement selon la revendication 4, caractérisé en ce que le passage du premier état de mémoire de forme au deuxième état de mémoire de forme est effectué de façon réversible du seul fait du franchissement de la température de transition dudit matériau à mémoire de forme.Connection element according to claim 4, characterized in that the transition from the first shape memory state to the second shape memory state is carried out reversibly from the only fact of crossing the transition temperature of said shape memory material. Elément de raccordement selon l'une quelconque des revendications 1 à 5, caractérisé en ce que lesdites férules (31, 32) sont constituées, chacune, dans ledit premier état de mémoire de forme, par un élément sensiblement tubulaire comportant une fente s'étendant sensiblement sur toute sa longueur.Connection element according to any one of Claims 1 to 5, characterized in that the said ferrules (31, 32) each consist, in the said first shape memory state, of a substantially tubular element having a slot extending substantially over its entire length. Elément de raccordement selon l'une quelconque des revendications 4 à 6, caractérisé en ce que lesdites douilles (41, 42) sont constituées, chacune, dans ledit premier état de mémoire de forme, par un élément sensiblement tubulaire comportant une fente s'étendant sensiblement sur toute sa longueur.Connection element according to any one of Claims 4 to 6, characterized in that the said sockets (41, 42) are each constituted, in the said first shape memory state, by a substantially tubular element comprising a slot extending substantially over its entire length. Elément de raccordement selon l'une quelconque des revendications 1 à 7, caractérisé en ce qu'il est en totalité réalisé en un même matériau conducteur à mémoire de forme.Connection element according to any one of claims 1 to 7, characterized in that it is entirely made of the same conductive material with shape memory. Ensemble d'éléments de raccordement selon l'une quelconque des revendications 1 à 8, caractérisé en ce que les premières (41) et deuxièmes (42) douilles sont maintenues dans un même boîtier isolant (60).Set of connection elements according to any one of claims 1 to 8, characterized in that the first (41) and second (42) sockets are held in the same insulating housing (60).
EP91401609A 1990-06-18 1991-06-17 Coupling element for a coaxial cable on contact pin and set of these coupling elements Withdrawn EP0462879A1 (en)

Applications Claiming Priority (2)

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FR9007565A FR2663470A1 (en) 1990-06-18 1990-06-18 CONNECTING ELEMENT OF A COAXIAL CABLE WITH CONTACT PINS.
FR9007565 1990-06-18

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CA2044836A1 (en) 1991-12-19
FR2663470A1 (en) 1991-12-20
US5092784A (en) 1992-03-03

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