FR2466111A1 - IMPROVEMENTS IN END-TO-END CONTACT CURRENTS AND INJURY RUPTURE - Google Patents

Abstract

CONTACT CURRENT SOCKET AT THE END IN WHICH ONE OF THE PINS OF EACH PAIR IS SLIDING FITTED AGAINST THE ACTION OF A SPRING WHILE THE BASE AND PLUG PINS ARE HELD IN CONTACT POSITION BY A REMOVABLE LOCKING MEANS, AGAINST THE TENSION OF AN ELASTIC MEDIUM. THE INVENTION IS CHARACTERIZED IN THAT THE BODY 26, 78 CARRYING THE PINS 13, 76 MOVABLE WITH RESPECT TO THE TUBULAR BASE 1, 73 UNDER THE ACTION OF THE ELASTIC MEANS 27, 88, 84 IS DISTINCT FROM THE BODY OF THE SHEET 21, 62 THE INVENTION ALLOWS TO SUBTRACT THE CUT TO THE EXTERNAL BRAKES EXERCISED ON THE PLUG.

Description

It is known to constitute end-contact sockets and

  sudden break in which, in order to reduce the time during which the contact pins are at a distance allowing the maintenance of the electric arc rupture and to make. this time independent of possible maneuvering errors

  of the operator, the base and the form are subject to the

  tion of a spring acting in the sense of their

  reciprocally. A suitable hook ensures the

  between the two elements in the con-

  the action of the spring and the release of said hook determines, under the action of the spring, the spacing of the plug relative to the base, that is to say the breaking of the current.

  It is thus possible to ensure the power cut

  rants of high intensity and high voltage, under safety conditions that can not be achieved,

  for example, plugs with cylindrical pins

  cooperating with a cell or socket

a radial elasticity.

  It was recognized, however, that security of

  such outlets could be further improved. Indeed, they comprise a tubular base in which is introduced, sliding, the body of the plug which is of corresponding shape; a

  certain game is obviously created between these two

  ments and it is important that, during the cut-off operation, no mutual jamming can occur between

  them, which could affect the quality of the rup-

  current and, at the limit, to immobilize the base

  and the card in a relative position such as to

  torise the maintenance of the arc of rupture and, by

  way of consequence, the deterioration of the device.

  Such a malfunction may, for example,

  caused by any obstacle of any kind

  on the cable of the card, or by

  following a traction exerted by the latter transverse-

to the axis of the whole.

  On the other hand, if the socket outlet is to operate in an explosion-proof environment, it is necessary, in order to avoid the risk of explosion during the formation of the breaking arc, to minimize the clearance between the base and the base. body of the card; it is clear that this condition further aggravates the risks of

  poor relative sliding of these two agra

  the so-called "pump" pneumatic effect

  tive existing seal, therefore, between the two elements and which, acting on a piston surface

  equal to the section of the form, is relatively

  and can bring a real impediment to their

  relative situation; The invention proposes to overcome these disadvantages and, for this purpose, it relates to an outlet with end contacts and sudden break of the type defined

  above, in which the contact pins

  judged two by two are subjected to the action of elastic means of relative spacing, remarkable in that

  the body carrying the movable pins with respect to the

  tubular under the action of elastic means, is

  separate from the body of the plug which cooperates,

smoothing, with said base.

  According to one embodiment, said movable pins

  the pins of the plug and they are carried by an insulating body slidably mounted in the body of the plug against the action of a spring acting in the direction of the spacing relative to the base, while

  that the insulating body is secured to a pusher

  edge outside the plug body and provided with means for holding the spring in compression position associated with a means for releasing said push rod and that

  the plug body is provided with locking means of its own.

  compared to the base and intended to be unlocked

  after maneuvering the release hook of the pusher.

  According to another embodiment of the invention, the plug carries, in a fixed manner, the fixed pins, and its body has an inclined heel intended to cooperate, for the position of contact, with a locking hook articulated on the base, recalled in active position by a spring and

  carrying a de-keying key operable manually

  nuously; the movable pins are the pins of the base; each of them is mounted, with possibility of sliding and partial rotation around its

  axis, in a socket integral with the insulating body of the

  cle which carries at least one notch forming a cam,

  cooperating with a lug secured to the spindle of

  to determine the rotation of the latter during said sliding, said pin being further, on the one hand, at its base, connected to the base of the base by a tension spring and carrying, on the other hand, to the upper part emerging from the socket,

  a stud cooperating with a groove forming a cam and

  during a cylindrical chamber of insulating material slidably mounted, without the possibility of rotation, against the action of a higher power spring

  to that of the spindle pulling spring and

  valiant at compression at its base in a dwelling

  corresponding shape with an axially

  fice passage for the corresponding conjugate pin secured to the sliding body of the plug, the chamber carrying at its upper part a co-axial orifice to the first and least section, intended to cooperate with a shoulder formed on the end of the latter

  spindle, and the cam-forming groove having, at

  firing from the base of the chamber, a part extending

  a generator, extended, at the top, by a section extending in a diametrical plane to which

  it is connected by a suitable part of curvature.

  The invention will be well understood on reading the

  cription which follows, with reference to the accompanying drawings in which: Figures 1, 2 and 3 show in elevation and partial section, an embodiment of the invention shown respectively: in the inactive position, the closure cover of the base closed sealed in position of engagement and locking of the plug in the base - and in the contact position of the plug pins with the base pins and Figures 4 to 6 show, in partial section, another embodiment at various stages of operation. In Figures 1 to 3, 1 designates the base of a socket according to the invention which comprises a body 2, for example light alloy fixed by means not shown, in a carrier wall 3; in the body 2 is housed, integrally, a base 4 made of insulating material in which are immobilized the contact pins of bases as 5 connected to the

  phase line such as 6 by one.

  cable greenhouse that was not otherwise represented.

  For the sake of clarity, only one base contact 5 has been shown; however, it must be understood

  that the base, as well as the corresponding file which

  ra described below, obviously include as many contact pins as the required current transported,

  for example three, distributed in principle so that-

  remote. The body 2 of the base is closed removably by a cover 8 articulated at 9 on said body and subjected

  the action of a spring adjusted to confer on it

  rer two stable positions, one closing (Figure 1) and the other opening (Figures 2 and 3). In the closed position, a seal 10 of elastic material provides a seal. The contact pins 5 of the base each open by their ends it intended to come into contact with the end portions 12 of the pins 13 of the plug which they are conjugated, in a chamber 14, called "breaking chamber", by the disc 15 which has an aperture 16 of section very close to that of the extreme part 12 of the corresponding pin pin which

  is intended to cross it (Figures 2 and 3). This disc

  position in itself known in principle, is des-

  to contribute to the elimination of the risks of

  flagtion in the case where the device must function--

in an explosive environment.

  The removable plug 20 of the socket comprises a body 21, for example made of light alloy and provided with two diametrically opposed lugs bayonet fixing such as 22 intended after introduction, then low amplitude rotation of the plug in the base (Figure 2), to cooperate, in known manner, with two opposite conjugate notches retaining, such as 23 spares

in the body 2 of it.

  In addition, the body 2 has a peripheral rib

  24 to be applied against the perimeter

  Rectangle 17 of the base with interposition of a seal

  sealing 25 integral with said rib.

  Inside the body 21 is arranged an insulating body

  slider 26 immobilized in rotation by means of

  naked and unrepresented; a spring 27, working in compression between a shoulder 28 of the insulating body and a shoulder 30 integral with the body 21 of the plug, tends to maintain said insulating body in abutment against a second

  shoulder 30a of the body 21 arranged opposite the

  cylindrical section 41 of the latter which is intended to

  narrate with a small clearance, in the base, between the wall

  internal 18 thereof and the insulating base 4.

  The insulating body 26 carries, in a sliding manner, the

  contact pins 13 of the form, respectively

  for the corresponding contact pins of the base.

  Each pin 13 is guided by the aperture 29 and the passage 29a of the insulating body 26 between which is formed a co-axial housing 31 in which a spring 32 works to compress between the bottom 34 of said housing and a shoulder ring 33 solidarity with the pin so

  to solicit this past to project out of the body iso-

lant 26.

  24661 1t As will be understood from reading the following

  the description, the spring 32 is intended to provide the

  contact pressure between the facing ends 11 of the base pins and 12 of the plug pins, one and the other provided in a known manner, pellets con-

  35, 36 made of high-conductivity metal

such as money.

  The body of the card still bears, solidly

  re, a support 37, made of insulating material, which carries the starting terminals 38 of the conductive wires 39 of the cable 40 which serves the devices to supply electric power. Each terminal 38 is connected to the

  part of the corresponding pin opposite the pastil-

  the contact, by an axially deformable conductive element such, in the example, a tubular braid

  51 brazed or crimped at each of its ends

  on the terminal and on the spindle, this provision

  being intended to allow the spindle to perform axially

  movement of a certain magnitude

port at its contact terminal 38.

  Finally, the insulating body 26 carries axially and

  an integral, opposite the base 1 a rod 42 which slides with a small clearance, in the sleeves 43, 44 formed axially respectively in the support 37 and in the end cap 45 of the plug body 21; the rod 42 carries on its outer end a pusher

  46 which has a hooking heel 47 arranged to cooperate with

  with a tilt-mounted catch hook 48,

  be the action of a spring not represented, around a

  axis 49 carried by the cap 45 and presenting, at the oppo-

  se of its active part, an operating key 50 on which it can be pressed against the action of the spring. The assembly is arranged in such a way that, when the pusher is biased toward the cap 45,

  its heel 47 crosses the hook 48 which disappears down

  against the action of its spring then, recalled by it, just lock the pusher against the action

  of spring 27 which during this maneuver was

  m between the shoulder 28 of the sliding insulating body

  26 and the shoulder 30 of the body 21 of the plug.

  The assembly is still arranged in such a way that when the pusher is thus locked by the hook

  48 and that the plug was inserted into the base and ver-

  rusted therein by the bayonet device 23, 24, the pins 5 of the base and 13 of the plug are in mutual contact by their pads 35, 36 against a suitable and predetermined compression of the spring 32, the pin being then brought to perform an axial sliding movement of small amplitude relative to the base

  against the action of the spring 32 which is then compressed against

  be the ring 33 and the bottom 34 of the housing 31.

  It should be noted that the disc 15 can be made in the form of a safety disc rotatably mounted around the axis of the base 1 against the action of a return spring, not shown, which urges it to a maximum

  display position of the pin pins determines the

  Axially oriented guide groove 22 is formed by a guide groove. According to a known arrangement, the openings 16 of the safety disk then mask the chambers 14.

  are penetrated by the pins 13 and the disc is

  born by the rotational movement applied to the record until

  the locking of the bayonet device, this movement

  sufficient to bring the openings 16 in the axis of the chambers 14 (It is recalled here that the insulating body 26 which depends on the pins 13, is immobilized in rotation

relative to the body of the plug).

  The socket thus constituted operates in the following manner The cover 8 of the base having been previously opened, and the pusher 46 of the plug being released from its hook

2 4 66 1 1 1

  retainer, the base and the plug and their components

  in the relative positions shown in FIG. 1, the cover being, of course, in the

  position of Figure 2. The insulating body 26 is in

  against the shoulder 30a under the action of the spring 27 and the pins 13 abut, by their rings 33, against the bottom of the housing 31 opposite the funds 34 on which the springs 32 bear, the tubular braids 51 being then distorted by dilatation and

having their minimum length.

  For the establishment of the contact, the plug is then inserted into the base, its lugs 22 traversing the conjugate grooves of axial guide formed in the

  base. In this movement and as it was said above

  pin 13 penetrates the openings 16 of the dis-

  safety while the lugs 22 reach the bottom of the guide grooves in which open, in a known manner, the notches 23 of the bayonet locking device. The plug is then applied to a rotation movement whose small amplitude is determined by the peripheral length of the notches 23; the card then

  reaches its locking position in the base,

  presented in Figure 2, where it is now

  naked by the bayonet device

formed for this purpose.

  In this position, the openings 16 are coaxial to

  breaking rooms 14. To establish contact,

  then pushed the pusher 46 towards the cap

  the plug until the heel 47 comes in

  to wager under hook 48 after raising it against

  the action of its return spring. This movement

  I release it '27 by moving the insulating body 26 towards the base and, at the end of the race and before the heel 47 is locked by the hook, the

  contact pads 36 of the pins 13 come into

  with the pellets 35 of the pins 5; the contact is thus established and, the movement of the pusher being continued until locking its heel by the hook, the springs 32 are compressed in their housing by the progression, thus continued, of the insulating body 26; after locking the heel by the hook (FIG. 3) the springs 32 thus provide the contact pressure necessary for the proper passage of the current, pressure

  for which they were previously tarnished. Well

  tense during this phase of the operation, the pins

  13 have moved away from bounds 38, which is made possible

  the elongation capacity of the braid 51, in a manner known per se. Said braid then takes on

aspect shown in Figure 3.

  To determine the power cut, simply exert

  pressing the key 50 of the hook until it releases the heel 47. Under the action of the spring 27 which acts as a sudden breaking spring, the insulating body 26 then abruptly recedes * causing in this movement axial pins 13 held captive housing 31 by the rings 33. The plug can then be left in place in the locking position in

  the base for later restoration of contact.

  It thus constitutes a real removable switch.

  It can also, in a classic way, be unlocked

lée and extracted from its base.

  It should be noted that in this realization,

  and contrary to known outlets, the speed

  with which the cut is made is independent

  the greater or less freedom of movement of the body of the plug relative to the base, freedom which, in

  said known outlets, may, for example, be

  by the sheer weight of the cable such as 40. Indeed,

  the speed of the cutoff depends on the invention,

  the recoil movement of the insulating body 26 under

  the action of the breaking spring 27 and this movement is effected

  within the enclosed and protected space

  undermined by the body of the card which remains motionless

  in the operation of training properly so called; the movement

  the insulating body can not be subjected to

246611 1

  no impediment of any kind, with the sole exception of the freedom of the recoil movement of the pusher which does not pose

obviously no problem.

  It should also be noted that if the taking of

  rant is called to operate in a flagrant environment, it is possible to build it, without inconvenience, with

  a very small game between the body of the card and the

  key. Indeed, it is clear that the pneumatic effect

  pump is only applied to a piston surface that is con-

  staggered by the section of the rod 42 of the pusher increased the section of the contact pins whose play in the openings 16 is very small, as well as that of the rod 42 in the sleeve 44. This total section is obviously , much lower than the section of

  body of a sheet of the same dimensions and negligently

the pump effect.

  It should also be noted that both

  above mentioned advantages of function safety-

  and the lack of practical pump action are

  each other, although one and the other

  of the provision just described.

  The embodiment of FIGS. 4 to 8 is remarkable.

  in that the movable pins subjected to the action of the elastic means determining the abrupt rupture of the electrical contact are carried by the base and not by the plug as in the embodiment previously

  described; it has been imagined, in particular-in order to simplify

  proud of the constitution of the card, more exposed to

  the base and also to make its replacement less expensive in case of deterioration, all the elements of the mechanism determining the sudden break being reported.

  on the base which is obviously less exposed to damage.

  In said figures, 61 denotes the removable plug whose body 62 intended to slide in the base, is

  integral with an internal partition 63 on which are

  pin-plugs such as 64 that remain

  thus solidarity of last end.

  It should be understood that in the rest of the description

  tion, only one plug pin and one socket pin associated with it will be described with

  all the elements contributing to their functioning

  judged and that the socket has, obviously, as many identical pairs of pins associated (of base

and record) that it is necessary.

  The pin 64 is connected to the corresponding wire 65 of the

  cable by a terminal 66. Opposite the terminal, it pre-

  in the vicinity of its extremity, a portion of

  section 67 which determines the formation of a shoulder 68. Of course, it bears on its extreme part, a pellet 69 of high conductivity metal, such as silver, intended to come into contact with a pellet

  similar 70 carried by the base pin.

  The plug body has a heel 71 for

  in the position of contact with a hook of

  72, articulated at 75 on the base 73 and

  peeled in the active position of attachment of the heel by a spring 74. During the depression of the plug in the base, the ramps inclined opposite the heel and hook determine the lifting of the latter which then falls behind the heel in locking it (Figure 6). Unlocking can be obtained by a

  pressure exerted on an operating key 75 of the

  chet; it then releases the heel 71 of the card.

  Each pin of the base 76 is mounted with possibility of sliding and partial rotation about its axis, in a socket 77 integral with the insulating body 78 of the base which carries two diametrically opposed groups of two cam-forming notches 79,80, of opposite dispositions, cooperating respectively with the pins such

  81, 82 integral with the spindle so as to determine

  rotation of the latter during the said

  lissement, said pin being further, on the one hand, at its base, connected to the terminal 83 of the base by a spring 84 working traction and carrying, on the other hand,

  at the upper part emerging from the socket, two

  85 each cooperating with a groove 86 forming

  cam and dependent on a cylindrical chamber 87 in

  an insulating member slidably mounted without the possibility of rotation against the action of a spring 88 of greater power than that of the tension spring 84 of the spindle and working at the base of its compression in a housing 89 of corresponding shape to that of the so-called

  Chamber and which, with a view to prohibiting

  tation, grooves 95 in which slide ribs 96 of the chamber. The insulating body 78 presents

  axially a passage hole 90 for the spindle

  judged corresponding 64 secured to the sliding body 62 of the plug, the chamber carrying at its upper part a co-axial orifice 91 at the first and least section,

  intended to cooperate with the shoulder 68 formed on the former

  tremity of this last brooch. The groove 86 forming cam has, from the vicinity of the base of the chamber, a portion 92 extending along a generatrix, extended at the top by a section 93

  extending in a diametrical plane to which it is connected

  by a part of suitable curvature.

  The whole of this device is arranged in such a way

  that, at rest (FIG. 1), the movable spindle 76 is

* peeled in the low position by the action of its return spring 84 while the chamber 87 is in the upper position, resting against the upper bottom 89a of its housing 89; when the plug is introduced into the base, firstly, each pin 64 after passing through the corresponding orifice 90, comes, by its shoulder 68, against the upper face 87a of the chamber 87 (FIG. 4) and causes it to move down against the action of its compression spring, the extreme part

  67 of the spike protruding into the interior of the chamber

  ber; the base pin 76 is then immobile and each

  its nipples 85 runs the rectilinear ascending

  the corresponding groove of the chamber descending into the housing 89; the length of the plug pin is such that, when the pin 85 engages the curved portion 94 of the groove, the end 69 of the plug pin contacts the end of the pin of the pin. pedestal (Figure 5) which, until then could not turn due to the engagement of the nipple in

  the vertical groove 92 of the immobilized chamber

  in housing 89 as it has been said; the plug pin thus drives the stand pin down as the current is set; 1 '

  pin 81 of the base pin and the notch 79 for-

  mant cam with which it cooperates are positioned from

  such that, from the beginning of the descent of the bro-

  che, the lug attacks the portion 79a of said cam (which

  depends on the socket 77 constituting the fixed cam own-

  so called), and which is shaped in such a way as to

  the rotation of the spindle in the direction for which it causes the engagement of the stud 85 in the part

  curved 94 of the groove, then in its part 93 com

  taken in a diametrical plane, the nipple and the ramp 94-

  93 being arranged in the chamber 87 so that the latter is, by the action of said pin, slightly spaced from the shoulder 68 when the pin reaches the end of stroke in the portion 93 of the ramp (Figure 6); ergot

  of the spit then came to the bottom of his race to the ex-

  mity of the cam part and he then takes support

  against the other side 79b of the notch 79, which is parallel

  aligns with the axis of the spindle; this time of the operation corres-

  at the finish in the hook lock position

  tilting 72, articulated on the body of the base, and which re-

  then holds in a known manner, the heel 71 depending on the body of the sheet; the operator can then release the

  pressure exerted in the direction of the depression of the

che in the base.

  In this position (Figure 6) the contact pressure

  is provided by the compression spring 88 which

  cite the chamber upwards and that via the pin 85 engaged daps the diametrical portion 93 of its groove, maintains the base pin 76 in contact with

  the plug pin 64 immobilized itself by the cro-

lock lock 72.

  When it is desired to cut the current, it is sufficient, as in the cnnus devices, to exert pressure on the end of the swinging hook. This releases the body of the plug which then rises (FIG. 7) under the action of the compression spring which is exerted by 1 '

  intermediate of the chamber which is supported by the

  68 of the plug pin; the movement is

  follows until the upper part of the chamber

  come in the vicinity of the upper bottom 89a of the housing.

  During this upward movement, the chamber

  draws up the base pin it is

  remained united through the dia-

  metale of its groove and the pin of said pin which is engaged. This movement takes place against the tension of the tension spring 84, of lower power than that of the spring 88 and which connects the base of the pin to the bottom of the base, for example directly to the terminal of

  contact 83, being here reminded that the electrical connection

  that proper is ensured for example by a tubular braid 97 (shown in section) crimped, on the one hand, on the basis of the spindle and, secondly,

  said contact terminal and which, in accordance with

  tion, expands when the spindle is in its compression position corresponding to the passage of the current. As has been said, the socket 77 integral with the

  insulating body 78 of the base at its lower part

  re a second indented portion 80 forming a cam, analogous

  first and of opposite disposition, and which

  father also-with a second lug 82 integral with the base pin. This cam-shaped indentation and this lug are arranged in such a way that, when the

  room 87, which leads to terminal 76 upwards, arrives

  near the end of its course (Figure 7), the er-

  Got 82 which until now has moved along the edge 80c of the notch, parallel to the axis, attacks the portion 80a forming the actual cam, of the opposite arrangement of the first and determines the rotation of the spindle 76

  in the sense of returning to his rest position; he is

  the nipple 85 traverses the groove 93, 94 in the opposite direction of its initial rotational movement and comes

  to leave in the vertical part 92 of that rationale

  nure. Nothing opposes then the action of the spring

  traction force 84 of the spindle which determines abruptly

  that the return of this one to its initial position of re-

  pos (figure 8) thus ensuring the breaking of the current

under the required conditions.

  It is obvious that the tension spring 84 can be tared so as to determine the recoil motion of the

  pedestal pin under pre-defined speed conditions

  completed. It is also obvious that the functioning

  of the current-breaking device is completely independent of any annoyance or parasitic mechanical action that could be exerted on the plug body at the time of the breaking maneuver since all the elements which determine said break depend solely on the base and that the assembly is arranged in such a way that the contact pressure provided by the action of the compression spring on the chamber is maintained until the nipples engage in the vertical part, or more

  exactly parallel to the axis, 92, of the guide groove

  dage. It is clear that the maintenance of the contact pressure during the rotation of the spindle is all the easier

  to realize that the curved connection portion 94 en-

  be the parts of the groove respectively of plan dia-

  93 and parallel to axis 92, is also little developed.

as possible.

  It should also be noted that the rotation of the base pin 76 with respect to the plug pin 64

  determines an automatic cleaning of the pellets

  tact 69, 70 which also rotate with respect to

  be with each manoeuvrè-of putting in contact or cut

of the current.

  It should also be noted that after the interruption of the

  the plug can be either extracted from the base as shown in Figure 8, or left station in it, in a waiting position, intermediate between that

Figures 7 and 8.

  Finally, it is clear that the common characteristic of

  two devices described above is to make the function

  tion of the device for sudden breaking of the current

  depending on the greater or lesser ease of

  the base and the body of the sheet because of the

  that in both cases the insulating body carrying

  the pins that are movable relative to the tubular base

  under the action of the spring intended to provoke the rup-

  abrupt contact, is distinct from the body of the plug which slides in the tubular base and can therefore be in translation, independent of said body of the plug and thus, subtracts from the constraints that may hinder the

  free sliding of the latter relative to the base.

  This, regardless of the resulting safety of operation, also allows, if the power socket

  must operate in an explosive environment, reduce the

  maximum the existing gap between the base and the body of the

  without being generated by the pump effect due to the relative

  existing seal between the two elements.

2466 11 1

Claims (4)

  1 - End-contact and break-away power socket   than the type in which one of the conjugate pins of each pair of contact pins is mounted axially sliding against the action of a spring which provides the contact pressure and connected to its line terminal by a deformable conductive element while that the pins of the base and the mobile plug are, in the position of contact,   held together in pairs by a locking means   removable battery, against the tension of an elastic   in the direction of their spacing, characterized in that the body (26, 78) carrying the pins (13, 76) movable relative to the tubular base (1, 73) under the action of   elastic means (27,88,84) is distinct from the body of the   che (21,62) which cooperates, in a sliding manner, with the- says socle.   2 - Socket according to claim 1, characterized   characterized in that the pins movable relative to the base   tubular are the pins (13) of the plug (20) and are   by an insulating body (26) slidably mounted in the body of the plug against the action of a spring (27)   acting in the sense of distance from the   key, while the insulating body is attached to a   evening (42,46) opening outside the record body   (21) and provided with means for maintaining the spring in position   compression ratio (47,48) associated with a means of   said pusher and that the plug body and the   pedestal are provided with conjugate means (22, 23) for locking   mutual insurance intended to be eventually unlocked   after operation of the pusher release means.   3 - Socket according to claim 2, characterized   characterized in that each of the pins (13) of the plug (20) is axially slidably supported by the   insulating body (26) and is urged to project from   ci by a contact pressure spring (32) arranged in a housing (31) of said insulating body and working between the bottom (34) of the housing and a shoulder ring (33) attached to the spit.   4 - Socket according to claim 1, characterized   characterized in that: - the body (62) of the plug integrally carries the plug pins (64), said body having an inclined heel intended to cooperate, for the position of contact,   with a locking hook (72) articulated on the   tubular key (73) recalled in active position by a res-   fate (74) and carrying an unlocking key (75) manually operable,   the pins movable relative to the base are the pins   ches (76) of the base each mounted with possibility of sliding and partial rotation about its axis, in a bushing (77) integral with the insulating body (78) of the base which carries at least one notch forming two   cams (79,80) each cooperating with an ergot (81,82)   lidaire of the spindle so as to determine the rotation of the latter in one direction and then in the other, during said sliding, said pin being, in addition, on the one hand, at its base, connected to the base of the base by a spring (84) working on traction and bearing, on the other hand, at the upper part emerging from the sleeve, at least one pin (85), each movable pin being associated with - a cylindrical chamber (87) of insulating material slidingly mounted, without possibility of rotation, in a housing (89) of corresponding shape, against the action of a spring of power greater than that of the pulling spring of the spindle and working at the compression, at its base, said chamber having axially a   orifice (90) for the corresponding conjugate pin   (64) integral with the sliding body of the plug, the chamber carrying, on the one hand, at its upper part an orifice (91) coaxial with the first and of a smaller section,   intended to cooperate with a shoulder formed on the end   of this last pin, and secondly, a reason   camming member (86) cooperating with the pin of the broach   che movable and having, from the base of the chamber a portion (92) extending along a generatrix, extended, at the top by a section (93)   extending in a diametrical plane to which it is connected   corded by a portion (94) of suitable curvature, - all of these elements being arranged in such a way that during the insertion of the plug into the base, the plug pin pushes, by its shoulder, the chamber towards the base of the base against the spring 88r then, after contact of its end with the end dela   base pin (76) determines the descent of the latter   re and its rotation under the action of its ergot (81)   with the appropriate conjugate cam 79 and thereby causes   if the penetration of the pin (85) into the diametrical section (93) of the groove of the chamber while at the same time the heel (71) of the plug is locked by the hook (72) of the base, then, after release of the heel by the hook, the rise of the chamber under the action of the spring (88), the reverse rotation of the base pin under the action of its lug (82) cooperating with the conjugate cam (80) and the abrupt return of said spindle to its initial position under the action of the spring (84) as soon as,   at the end of this rotation, the nipple (85) is again   calf in the vertical portion (92) of the groove (86).