FR2662547A1 - COAXIAL CABLE CONNECTOR. - Google Patents

Abstract

It is characterized in that it comprises on the one hand a central conductor (1) and on the other hand a conductive ferrule (2), both in a substantially cylindrical conductive body (3), with the ferrule on the one hand directly secured to the body in a rear section (3B) thereof and on the other hand providing an annular receiving space with clamping of the external conductor of a coaxial cable, between it and the body, and with the central conductor (1 ) trapped in an insulating support ring (4), itself made integral with the body in a front section (3A) thereof.

Description

The present invention relates to a connector

  coaxial cable, especially video communication This connector must maintain the electrical characteristics of the cable and have good mechanical strength on the cable. The present invention aims to provide these two functions simultaneously and thereby allow rapid and simple mounting on

a coaxial cable.

  It relates to a coaxial cable connector, with said coaxial cable comprising a central conductive core, a dielectric coating on said core and an external conductor on said dielectric coating and the connector comprising, held coaxially and isolated from one another , a central conductor and an external conductive structure with respect to this central conductor, for contacting the core and the external conductor of the cable, respectively, characterized in that said conductive structure consists of a ferrule and an external conductive connector body , of substantially cylindrical shape and having a so-called rear section, for receiving said cable, in which the ferrule is on the one hand secured to the body and on the other hand provides, between itself and said body, an annular space for clamping said external conductor of said cable, and a front section, in which said central conductor is mounted prisoner in an insulating support ring, itself rendered

integral with said body.

  According to another characteristic, said ferrule comprises, on the one hand, a front shoulder, of diameter substantially equal to the inside diameter of the rear section of the body, by which the ferrule is integral with the body inside the rear section according to the length of the body, and peripheral means of anchoring along the space

  annular which it defines with the rear section of the body.

  According to another characteristic, the ferrule can initially be independent of the body and then be blocked by any suitable process in the rear section of the body, or be directly obtained with the body. Advantageously, the anchoring means presented on the ferrule are a thread the making self-tapping for the outer conductor -2- from coaxial cable to the smooth outer conductor and self-tapping for the

  outer conductor of coaxial cable with outer grooved conductor.

  The characteristics and advantages of the present invention

  will appear more clearly during the description given below

  of an embodiment given by way of nonlimiting example and illustrated in the accompanying drawings In these drawings Figure 1 shows in section a coaxial connector according to the

present invention.

  Figure 2 and Figure 3 show in section a first and a second coaxial cable, which are equipped with the connector according to Figure 1. Figure 4 shows in section another coaxial cable equipped with a

  connector according to a variant of FIG. 1.

  The coaxial connector shown in FIG. 1 is said to be of the monobloc type. It comprises a central conductor 1 and a conductive ferrule 2 in a body 3 also conductive. The central conductor 1 and the ferrule 2 are both made integral with the body 3 and are isolated l 'a

the other.

  The body 3 has a generally cylindrical shape It has a front section 3 A for the central conductor 1 and a rear section 3 B in which the ferrule is 2 It also has an internal shoulder 3 C between its rear section 3 B and its front section 3 A slightly smaller. The ferrule is directly integral with the body 3 It is produced independently of the body and is blocked therein or alternatively belongs to the body and obtained with it It is of generally cylindrical shape, with a front shoulder 2 A of diameter corresponding to the inside diameter of the section rear 3 B of the body 3 and coming against the inner shoulder 3 C of the body 3 The central conductor 1 is made integral with the body by an insulating support ring 4, in which it

  is mounted prisoner and is blocked in the front section of the body.

  This central conductor is thus made prisoner longitudinally on

the axis of the body.

  Being at the start independent of the body 3, the ferrule 2 is made integral with the body 3 and locked in its rear section against the shoulder 3 C by force fitting, crimping, screwing, necking or any other suitable process The support ring 4 carrying the central conductor 1 is likewise made integral with the body 3 by

any suitable process.

  A spacer washer 5, made of insulating material, is preferably mounted with the ferrule 2 and locked with it in the rear section of the body. It is partially housed in the front face of the ferrule and locked with its shoulder 2 A against the internal shoulder. 3 C of the body 3 This insulating washer receives centered in the hole which it presents in its middle the rear end of the central conductor 1, the two end parts of which protrude from its support ring 4 The front end of the central conductor is substantially level with the tip of the

  front section of the body and centered there.

  In this so-called monoblock coaxial connector, the ferrule 2 provides, at the rear of its shoulder 2 A, between it and the body 3, an annular space 6 This annular space is intended for the external conductor of coaxial cable possibly coated with a sheath external protection It maintains it tightly, while the inner conductor or core of the cable is simultaneously in intimate electrical contact

with the central conductor 1.

  In particular, the internal diameter of the rear section 3 B of the body 3 and the dimensions and shape of the ferrule 2 are adapted to the type of coaxial cable concerned in order to obtain the desired tightening of the external conductor with or without its external sheath of protection and consequently obtaining intimate electrical contact with the external conductor For this purpose, the ferrule 2 has a thread 2 F or the like, making it self-tapping or self-tapping depending on the type of external conductor, smooth or not, of the cable It thus anchors firmly in the outer cable conductor, under which it is inserted. It also has a 2 C chamfer on its rear edge, facilitating its insertion under the outer cable conductor, when the

  connector is screwed at the end of the cable.

  An annular seal 7 is mounted in the rear edge of the shoulder 2 A of the ferrule It comes on the periphery of the shoulder 2 A, to be compressed against the shoulder 2 A and the body 3 by the end of - 4 cable mounted in this connector It provides transverse sealing of the

  connector when it is thus fully compressed.

  The body also has externally on its rear section 3 B 3 P dishes, or alternatively notches or holes, which facilitate the screwing and tightening of the connector on the end of a

  coaxial cable using a wrench.

  On its front section 3 A, the body carries a threaded terminal nut 8, for screwing the connector on a coaxial connector complementary to another coaxial cable, of equipment, of apparatus or of a circuit board This connector complementary is not illustrated It has a front end fitting complementary to that illustrated and threaded and has a rear section similar to that of the connector illustrated or connected to

  the equipment, device, or circuit involved.

  On the coaxial connector, the nut 8 is mounted with a limited stroke possible on the front section 3 A, being trapped between a rear abutment shoulder 3 D and a retaining circlip 9 On this section before another internal seal 10 the nut ensures transverse sealing of this connector when it is connected to a complementary connector. In addition, advantageously one or more screws such as 13 can be used for locking in rotation in the rear section of the body 3 of the cable end, once in place in this connector. For this coaxial connector according to the invention, it is indicated by way of example that the body 3 and the ferrule 2 are for example made of brass, or bronze, or else of a conductive alloy known by the name Zamac The support ring 4 will be example in polytetrafluoroethylene In addition, the central conductor is as such of known type It is for example with longitudinal slots of elastic deformation, on its rear end part, as illustrated, or with pressure spring or contact piston in its part rear terminal Its terminal part

  front is of current type, as illustrated.

  Figures 2, 3 and 4 show the coaxial connector according to the present invention mounted on different coaxial cables In these figures, the main elements of the connector have been identified by the - references used in Figure 1 Only the differences

  possible with respect to FIG. 1 are specified below.

  In FIG. 2, the coaxial cable has a central conductor or core 21 surrounded by a dielectric coating 22 and an external conductor 23 mounted on the dielectric 22 and covered with an external protective sheath 24 The external conductor 23 is laminated or overlapped It is made of copper or aluminum For this type of cable, the coaxial connector is mounted on the cable end, with its relatively thin outer conductor 23 kept coated with its protective sheath The ferrule 2 is inserted under the conductor outer 23 and firmly anchored in this outer conductor 23 the latter is clamped with its sheath 24 between the shell and the body 3 of the connector while the central conductor 21 of the cable and that 1 of the

  connector have been brought into intimate electrical contact.

  In FIG. 3, the coaxial cable comprises a central conductor or core 31, a dielectric coating 32 on this central conductor and an external conductor 33 This external conductor is a smooth conductor, made of copper or aluminum, it is extruded or welded It is without outer protective sheath It is therefore alone between the ferrule 2, which is anchored therein, and the body 3 of the connector, while the central conductors of the cable and of the connector are also in contact

intimate electric.

  In the two examples illustrated in these two figures 2 and 3, the ferrule 2 is self-tapping with the screwing of the connector on the cable end. The resulting anchoring guarantees excellent electrical contact between it and the external conductor of the cable and the ferrule, itself in intimate contact with the body 3, as well as excellent

  mechanical resistance of the connector on the cable end.

  In FIG. 4, the coaxial cable is with central conductor or central core 41, with dielectric coating 42 around the central conductor and with external conductor 43 This external conductor 43 is a fluted conductor, the flutes are on its internal face and are designated by 43 A It is made of aluminum or copper It is with an external protective sheath 44 For this type of cable, the coaxial connector is with a threaded ferrule 2, whose threads 2 F 'are rounded and at -6- no wider than in the aforementioned examples These threads 2 F 'are not slightly greater than that of the grooves, but remain of slightly smaller height. This ferrule is also given a slightly conical shape, better suited for its insertion under this grooved conductor 43, while its terminal chamfer can be removed as shown. Under these conditions, the ferrule 2 is screwed into the outer conductor 43, coated with its outer sheath when the connector is screwed onto the cable end. The terminal grooves received on the ferrule are slightly deformed, which ensures good anchoring of the ferrule. for the intimate electrical contact required and good mechanical strength. In the three examples of FIGS. 2, 3 and 4, the dielectric coating 22, 32 or 42 can be removed over a short terminal length, equal to or less than the length of the shell. The dielectric coating, partially removed or not removed, on the length of the ferrule, in correspondence is inserted around the central conductor of the cable inside the ferrule This central conductor of cable

  remains largely distant from the shell and isolated from it.

  The present invention has been described with reference to the examples illustrated. It is obviously possible to make modifications to it without departing from the scope of this invention. In particular the shape of the self-tapping or self-tapping ferrule and the diameters of the ferrule and of the section rear of the connector body are such that they allow firm tightening at the bottom of the race, between the ferrule and the body, of the wall of the cable, that is to say of its outer conductor or of the latter Ci with its outer sheath of

  protection, depending on the type of cable.

-7-

Claims (10)

  1 / Coaxial cable connector, with said coaxial cable comprising a central conductive core, a dielectric coating on said core and an external conductor on said dielectric coating and the connector comprising, held coaxially and isolated from each other, a conductor central and an external conductive structure with respect to this central conductor, for contacting the core and the external conductor of the cable, respectively, characterized in that said conductive structure consists of a ferrule (2) and an external conductive body (3) of connector, of substantially cylindrical shape and having a so-called rear section (3 B), for receiving said cable, in which the ferrule is on the one hand secured to the body and cleaned on the other hand, between it and said body, an annular space (6) for clamping said outer conductor (23, 33, 43) of said cable, and a front section (3 A), in which said central conductor (1) is mounted prisoner in an insulating support ring (4), itself rendered integral with said body (3).   2 / connector according to claim 1, characterized in that said ferrule (2) comprises, on the one hand, a front shoulder (2 A), of diameter substantially equal to the inside diameter of the rear section (3 B) of the body , by which the ferrule is integral with the body (3) inside the rear section along the length of the body, and peripheral anchoring means (2 F, 2 F ') along the annular space   which it defines with the rear section (3 B) of the body.   3 / connector according to claim 2, characterized in that said body (3) has an inner shoulder (3 C) between its rear section and its front section, against which is in contact the front face of   the shoulder (2 A) of the ferrule (2).   4 / connector according to claim 3, characterized in that said ferrule is initially independent of the body (3) and is blocked, in abutment against said inner shoulder (3 C), in said section rear (3 B) of the body (3).   / Connector according to claim 4, characterized in that it further comprises, an insulating spacer washer (5) partially housed in the front face of the front shoulder of the ferrule (2) and brought into abutment -8-   with the ferrule against said inner shoulder (3 C) of the body (3).   6 / connector according to claim 3, characterized in that said ferrule (2) belongs to said body (3) and obtained from manufacture with said body.   7 / connector according to one of claims 2 to 6, characterized in   that said anchoring means (2 F, 2 F ') are constituted by a thread, for screwing the shell under the outer conductor (23, 33, 43) of the cable.   8 / connector according to one of claims 2 to 7, characterized in   that it further comprises a first peripheral seal (7), partially housed in the rear face of the front shoulder (2 A) of the ferrule (2).   9 / connector according to one of claims 2 to 8, characterized in   that said body (3) has, in addition, external means (3 P) intended for clamping the connector on one end of the cable using of a key.   / Connector according to one of claims 2 to 9, characterized in that   that it comprises at least one screw (13) coming, through the rear section (3 B) of the body (3), to block the end of the cable in rotation in the connector.   11 / Connector according to one of claims 2 to 10, characterized in   that said annular space (6) is of dimensions adapted to receive and tighten said outer conductor (23) of the coaxial cable, which can be   covered with an outer protective sheath (24).   12 / connector according to one of claims 2 to 11, characterized in   that it further comprises a nut (8) and a seal (10) inside said nut, mounted around the terminal end of said front section, for its blocking on a complementary coaxial connector and a sealing between them.