FR2667731A1 - SHIELDED ELECTRICAL CONNECTOR, WATERPROOF AND ELECTRICALLY INSULATED. - Google Patents

Abstract

The invention provides an electrical connector (10) of the type comprising a plug (12) and a complementary base (14) and in which the plug comprises a metal plug body (16) which receives a plug insulating block (18), the open cells (20) receive electrical contact elements (22), and a bayonet type coupling nut (28) rotatably mounted on the front end (26) of the plug body, characterized in that the rear end (32) of the plug body comprises a hollow metal plug body extension (36) which delimits a rear wiring chamber (40) and the rear free end edge (42) of which tightens the cable shielding braid electric to be connected against the front face (44) vis-à-vis a clamping ring (46) and in that it comprises an insulating external clamping sleeve (52) whose free front end (56) is screwed onto the rear part (32) of the plug body (16) and the end li rear bre has an internal radial shoulder (58) which cooperates with the rear face (62) facing the clamping ring (46) to cause the tightening of the shielding braid by screwing the clamping sleeve (52 ) on the plug body.

Description

J The present invention relates to an electrical connector, in particular of the

  cylindrical type with plug and socket. The invention particularly aims to provide a shielded connector structure, waterproof, electrically isolated from the outside to protect its user and which allows electrical wiring and easy repairs. To this end, the invention provides an electrical connector of the type comprising a plug and a complementary base and in which the plug comprises a metal plug body which receives a plug insulating block from which the through cells receive

  electrical contact elements, and a coupling nut

  bayonet type mounted rotating on the end

  front of the plug body, characterized in that the end

  rear half of the plug body comprises a hollow metal plug body extension which delimits a rear wiring chamber and the rear free end edge of which tightens the shielding braid of the electric cable to be connected against the front face opposite screw of a tightening ring, and in that it comprises an external insulating tightening sleeve of which J / free front end is screwed on the rear part of the plug body and whose rear free end has an internal radial shoulder which cooperates with the rear face opposite the clamping ring to cause the tightening of the shielding braid by

  screwing the adapter sleeve onto the plug body.

  According to other features of the invention, the plug body extension is screwed onto the rear part of the plug body, the rear free end edge of the plug body extension and the front face facing the clamping ring are shaped into trunks of complementary cones; the clamping ring is made of insulating material and is extended axially towards the rear by a guide tube for the electric cable which projects out of the clamping sleeve through the bore which radially delimits said internal radial shoulder of the sleeve; the free front end of the adapter sleeve has a thread screwed onto a threaded portion of the rear part of the plug body and an annular end portion which extends axially towards

  the front beyond the internal thread to partially cover-

  ment the outer surface of the plug body with the interposition of a sealing ring; the coupling nut comprises a coating of insulating material which is extended axially towards the rear by an annular end portion which overlaps said annular end portion of the clamping sleeve; the connector comprises a metal plug plug which, in the uncoupled position of the connector, is mounted on the plug in place of the socket and whose external surface accessible to the user includes an electrical insulation coating; the base comprises a metal base body whose portions of the external surface accessible to the user in the coupled position are electrically insulated; the electrical contact elements of the plug are fitted elastically in the insulating block into the cells from which they are introduced axially from the rear; and a sealing ring is arranged between the external wall of each electrical contact element and the

  internal wall facing the corresponding cell.

  Other features and advantages of the invention

  tion will appear on reading the description

  detailed which will follow for the understanding of which reference will be made to the appended drawings of which FIG. 1 is a view in axial section of an electrical connector in accordance with the teachings of the invention and of which FIGS. 2 and 3 illustrate two modes

base insulation.

  We recognize in Figure 1 an electrical connector 10 consisting of a female connector element, or plug, 12 and a connector element

male, or base 14.

  The two elements 12 and 14 are represented in

coupled position.

  The plug 12 has a metallized plug body 16

  that inside which is arranged a block of material

insulator 18.

  The insulating block 18 has open cells.

  edges 20 each of which receives an electrical contact element 22 which is introduced axially into the cell from the rear face 24 of the insulating block and in which it is fitted elastically In the example illustrated in the figure, the electrical contact elements 22 of the plug are male contact elements which

  cooperate with complete female contact elements

  elements 23 arranged in the insulating block of the base.

  The structure of the insulating blocks is perfectly symmetrical and makes it possible to reverse the arrangement of the male and female electrical contacts with respect to the embodiment illustrated in the figure, the notion of female connector element or plug being understood.

  regardless of the type of electrical contact element

that he receives.

  In a known manner, the front end part

  26 of the plug body is fitted with a coupling nut-

  metal bayonet fitting 28 The axial retention of the nut 28 and the electrical continuity between the nut 28 and the plug body 16 are ensured by means of a

  spring 30 of known structure shown diagrammatically-

  is lying. The rear part 32 of the plug body 16 has an internal thread into which the free threaded front end 34 of a body extension is screwed.

file 36.

  The extension 36 is a metallic element in the form of a hollow socket, the internal bore 38 of which delimits an internal wiring chamber 40 intended to receive the wires to be connected to the elements 22 of an armored electrical cable of cylindrical section with braid of

  peripheral shielding (not shown).

  The free rear end edge 42 of the extension

  teur 36 has a hollow frustoconical profile section which is designed to cooperate with the front face of complementary profile 44 of a clamping ring 46 in

insulating material.

  A bi-conical metal ferrule 48 is interposed between the end 42 and the face 44 The ferrule is designed to receive the end of the metal braid for shielding the cable so as to ensure the tightening of

  the latter between the end 42 and the corresponding face

laying 50 of the ferrule.

  The axial clamping between the extension 36 and the ring 46 is ensured by means of a clamping sleeve

outer 52 of insulating material.

  The sleeve 52 has an internal bore 54 in

  which is received the cylindrical body of the extension 36.

  The front end of the bore 54 has an internal thread 56 which is screwed onto a corresponding external thread formed in the external surface

  of the rear part 32 of the plug body 16.

  The bore 54 is delimited axially towards the rear by an internal radial shoulder 58 whose internal radial face 60 cooperates with the radial face opposite 62 of the clamping ring 46, with the interposition of a washer 64. The clamping ring 46 is made of elastomeric insulating material and is extended axially towards the rear by a "wire-passing" guide tube 66 which passes through the shoulder 58 by an internal bore 68 of the latter to extend outwards. of the sleeve 52 towards the rear The guide tube 66 is designed to cooperate with the outer wall of the sheath of the cable to be connected. It is easily understood that the screwing of the sleeve 52 on the plug body 16 has the effect of bringing about an axial bringing together of the surfaces 42 and 44 and therefore a tightening of the surfaces 42 and 50 between which the braid for shielding the cable is received so as to ensure the best possible electrical continuity between the braid and the plug body 16 through the metal extension 368 The insulating clamping sleeve 52 extends axially forwards beyond the tapping 56 by an annular portion 70 which covers the external surface of

plug body 16.

  A sealing ring 72 mounted in a groove 74 of the plug body cooperates with the cylindrical surface

interior of extension 70.

  In addition to its sealing function, the extension 70 is provided to cooperate with a corresponding annular extension 76 which extends axially towards the rear and extends a coating 78 of insulating material which

covers nut 28.

  The annular portions 76 and 70 overlap axially in all the relative positions of the coupling nut 28 relative to the plug body 16 so as to ensure continuity of the external electrical insulation of the plug from the free edge

  front 82 of the nut to the insulating guide tube 66.

  The base 14 also comprises a metal base body 84 and an insulating block 86 The front end portions 26 and 88 of the plug body 16 and base 84 penetrate into each other in the coupled position and a gasket 90 is interposed

between these two portions.

  According to a variant of the design illustrated in the figure, it is possible to provide for the front edge of the base body 84 to extend axially so as to come into axial mechanical abutment against the face opposite 89 of the external radial shoulder 91 of the plug body This mechanical stop has the effect of improving electrical ground continuity and also of avoiding excessive crushing of the joint

  SO seal during coupling.

  A seal 92 is also arranged between the insulating block 86 and the base body 84, just as a seal 17 is arranged between the insulating block 18 and

the plug body 16.

  Sealing is also ensured between the electrical contact elements and their cells due to the elasticity of the insulating material of the insulating blocks. According to a variant not shown, it is possible to arrange a sealing ring around each cooperating contact. with the bore of the socket

corresponding.

  When the sleeve 52 is tightened, the axial compression force applied to the ring 46 made of flexible elastomeric material causes it to expand radially.

  expansion has the effect of providing peripheral tightening

  internal of the sheath of the cable to be connected which ensures the seal between the ring and the cable and an external peripheral tightening in cooperation with the bore 54 which ensures the seal between the ring

and the adapter sleeve 52.

  Thanks to the design according to the invention, it therefore simultaneously ensures electrical shielding continuity, perfect sealing and insulation.

complete external electric.

  FIG. 2 illustrates a first embodiment of the insulation of the base body 84 A nut of insulating material 92 is screwed onto the body & 4 It has an axial annular extension 94 which extends axially forward and overlaps the coating

  insulator 78 of the locking nut 28.

  In the embodiment of Figure 3, the mounting nut 92 of the base is metallic It is covered by the rear skirt 96 with an insulation nut

  98 which is also screwed onto the base body 84.

  The insulation nut 98 also includes an extension

  annular ment 90 as in the case of FIG. 2.

  The front face of the panel 100 which receives the base

  can also be covered with an insulating material.

  To protect the user and the electrical contact elements in the uncoupled position, each of the two connector elements can be fitted with a closure plug whose body is metallic and whose outer wall is coated with insulating material. The connection of the plug on the cable with the presence of the wiring chamber 40 makes it easy to repair and / or replace a contact element 22 by unscrewing the extension 36 and this even in the event of very high density of electrical contact elements The unscrewing of the extension can be facilitated by an external gripping zone by

speckled example.

  In a simplified variant not shown, the extension 36 can be of very small size axially to form a very short wiring chamber and, in the latter case, be produced in a

  single piece with plug body 16.

RRVRNDICATIONS

  1 electrical connector (10) of the type comprising a plug (12) and a complementary base (14) and in which the plug comprises a metal plug body (16) which receives a plug insulating block (18), the open cells of which ( 20) receive electrical contact elements (22), and a bayonet type coupling nut (28) rotatably mounted on the front end

  (28) of the plug body, characterized in that the end

  rear half (32) of the plug body comprises a hollow metal plug body extension (36) which delimits a rear wiring chamber (40) and the rear free end edge (42) of which tightens the cable shielding braid electric to be connected against the front face (44) vis-à-vis a clamping ring (46) and in that it comprises an insulating external clamping sleeve (52) whose free front end (56) is screwed onto the rear part (32) of the plug body (18) and the rear free end of which comprises an internal radial shoulder (58) which cooperates with the rear face (62) opposite the ring tightening (46) to cause the tightening of the shielding braid by screwing the tightening sleeve (52) on the plug body. 2 connector according to claim 1, characterized in that the plug body extension is screwed

  on the rear part (32) of the plug body.

  3 connector according to claim 1 or 2, characterized in that the rear free end edge (42) of the extension (36) of the plug body and said front face opposite (44) of the clamping ring (46)

  are shaped into trunks of complementary cones.

  4 Electrical connector according to any one of

  Claims 1 to 3, characterized in that the ring

  clamping (44) is made of insulating material and J} extends axially towards the rear by a guide tube (66) -electric cable which projects out of the clamping sleeve through the bore (68) which delimits radially said internal radial shoulder (58) of the sleeve (52). Electrical connector according to any one of

  claims 1 to 4, characterized in that the end

  free front of the adapter sleeve includes a thread (56) screwed onto a threaded portion of the rear part (32) of the plug body (16) and an annular portion

  end (70) which extends axially towards the front

  beyond the internal thread to partially cover the external surface of the plug body with interposition

a sealing ring (72).

  6 electrical connector according to claim 5, characterized in that the coupling nut (28) comprises a coating (78) of insulating material which extends axially towards the rear by an annular end portion (76) which overlaps said part

  annular (70) end of the clamping sleeve (52).

  7 Electrical connector according to any one of

  previous claims, characterized in that it

  has a metal plug plug which, in the uncoupled position of the connector, is mounted on the plug in place of the socket and the external surface of which is accessible to the user, has a coating

electrical insulation.

  8 Electrical connector according to any one of

  previous claims, characterized in that

  the base (14) comprises a metal base body (84) whose portions of the external surface accessible to J / user in the coupled position are electrically isolated. 9 Electrical connector according to any one of

  previous claims, characterized in that the

  electrical contact elements of the plug are fitted elastically in the insulating block in the cells

  from which they are introduced axially from the rear.

  Electrical connector according to claim 9, characterized in that a sealing ring is arranged between the outer wall of each electrical contact element and the inner wall opposite the corresponding cell.