FR2759142A1 - NESTING COUPLING FOR CONNECTING TWO FLUID CIRCULATION DUCTS - Google Patents

Abstract

In said coupling, in order to obtain a reliable indication of the mated state of conduits (1, 2) for circulating a fluid, a latching device is provided with an indexing tab (34) which can be elastically bent. , has, on a projection (35) passing through an opening (13) of a socket (3), an upward sloping face (36) intended to mount on a retaining rib (8), and rests on said rib (8) , by this projection (35), in the inserted state of the first duct (1).

Description

BUILD-IN COUPLING TO CONNECT TWO DUCTWORK

FLUID CIRCULATION

  The present invention relates to a coupling em-

  box for connecting two fluid circulation conduits, among which the first conduit has a first rib

  retaining device, comprising a first bushing, the wall of which

  have recesses with edges facing each other

  others in the axial direction of the first socket; a dis-

  positive latching provided with flexible supports

  elastic and provided, respectively, with a claw which is

  gée at the free end of said supports, can slide axia-

  both radially and radially with respect to the first socket and is

  intended to trap the first retaining rib, behind

  during the introduction of the first conduit into said

  latching device, the claws having, at their ex-

  free hoppers, a radially outer inclined surface to come to be applied, in the inserted state of the first conduit, against one of the edges of one of the recesses, which are turned

  towards each other, and a first inclined radiant surface

  inwardly, to come to bear against the first retaining rib when the first conduit is introduced,

  and having a second radially inclined surface

  térieur, which is turned away from the free end of the supports and is intended to come to bear against the first retaining rib, during the uncoupling of the first conduit; and at least one sealing ring between the first

  conduit and the second conduit connected to the latter.

  In a known push-in coupling of this kind (DE-

  C1-44 13 346), it cannot be ascertained, with certainty, if the two fluid circulation conduits are effectively connected to each other, rigidly, when the first

  conduit is inserted into the first socket.

  The object of the invention is to provide a coupling em-

  box of the type mentioned in the introduction, which allows, with

  certainty and in a simple way, to locate the coupled state.

  In accordance with the invention, this object is achieved by the fact that the latching device encircles the first socket with axial stop, and is provided with a tongue of inde-

  xage which can be bent elastically, present, on a pre-

  protruding steel penetrating through an opening of the first

  socket, an inclined rising pan intended to mount on the pre-

  first retaining rib during the introduction of the first duct, and rests on the first retaining rib in the inserted state of said first duct, by the first projection, being

  flexed radially outward; and by the fact that the se-

  cond conduit is connected to the first socket by matching shapes.

  In this solution, the indexing tab makes

  dialed projection, in the respectively coupled or inserted state of the first fluid circulation conduit, by a distance

  such that the coupled state can be clearly seen on the

said tongue.

  It is preferably made so that a second sleeve, encircling the latching device, is slidably mounted on the first sleeve by opposing an elastic force of the supports, with driving of the claws towards a uncoupling position. In this case, the uncoupling

  can be caused by a simple axial sliding of the sec-

  socket to the claw uncoupling position.

  When the edges of the recesses of the first sleeve, turned towards each other in the axial direction, are bevelled, with respect to this axial direction, at the same angle as the radially outer inclined surfaces of the

  claws, and when said claws pass through said recesses

  ment from the radially outer face of said first sleeve, said claws can, on the one hand, be easily animated by an axial and radial sliding towards the outside, during the introduction of the first circulation duct of the

  fluid, until they click behind the first

  retaining rib; and, on the other hand, under the action of a

  force applied axially to the conduits in the direction of a

  coupling, they slide more easily inwards, on the beveled edges of the recesses, than when they are in contact with an edge of said recesses. The clamping force, applied to the first retaining rib by the claws, thus increases very strongly without any voluntary voluntary retraction of the claws, through the recesses, so that an involuntary uncoupling is prevented to an extent

increased.

  In addition, it is convenient that the indexing tab

  is rigid in its longitudinal direction and comprises, external

  laughing in the radial direction, a second protrusion penetrating, in the integrated state of the first fluid circulation duct, into a radially uninterrupted hole which is made in the

  wall of the second socket. On the one hand, this projection is clear-

  highly visible from the outside to indicate that the first

  conduit is properly inserted, and the claws have imprinted

  rang from behind the first retaining rib; and, on the other hand, it prevents sliding of the second bushing, and therefore uncoupling by driving the claws, as long as it has not been deliberately pushed inwards again, in the radial direction, out of the hole in the

wall of the second socket.

  In addition, it is judiciously made so that the claws are provided with radially projecting studs

  outward and respectively engaging, through-

  inward, with a protruding protrusion radially inward

  laughing, beyond the second socket; and that there is formed, between the first sleeve and the indexing tab resting on the first retaining rib, a free space thanks

  which, by applying to the second projection of the tongue

  dexing, penetrating into the hole of the second sleeve, a force directed radially inwards, said tongue can flex to a position in which the projection of this tongue occupies a radial location inside the second sleeve. It is then possible in a simple way, with a view to uncoupling the fluid circulation conduits, to first of all push the second projection of the tongue towards

  inside, in the radial direction, until it has

  pledged from the hole, and consequently from the second socket; then move the claws obliquely outward in the radial direction, by axial sliding of the second bushing, until

  that they have moved away from the retaining rib of the

  mier led. Thus, the uncoupling of the two conduits is possible only when two measurements have been carried out,

  that is to say, the depression of the second projection of the tongue

  indexing and axial sliding of the second bushing

  to the uncoupling position. This increases the safety em-

  fishing for an involuntary uncoupling of the conduits.

  Preferably, the first projection of the tongue

  dexing is elastically deformable. This makes it easier to

  ment of the second projection, in order to decouple the conduits

fluid circulation.

  The first projection of the indexing tongue may, in particular, take the form of a hook. This allows an easy elastic deflection of the first projection and, consequently also, an easy introduction of the first conduit of

  circulation of the fluid, opposing the elastic force of the-

  said tongue when mating.

  An advantageous characteristic of embodiment can consist in that the supports consist of rings

  substantially configured in C, curved in the peri- direction

  spherical of the first socket, and the ends of which are connected to a respective one of two adjacent annular parts, which partially surround said first socket. In this way, the supports can be compressed elastically in

  the axial direction, like a spring Q. on the one hand to push

  grip the claws obliquely outward, in the

  dial, when the first conduit is introduced into the first

  first socket, then to bring them back, with wide relaxation of the elastic force, to the coupling position in which they trap behind the first retaining rib of the first conduit. Similarly, the claws can

  be easily brought to the uncoupling position by op-

  resting on the elastic force of the supports, following a slide-

  axial of the second socket, after the second projection

  of the indexing tab has been pushed radially inward

  térieur. The annular parts can be connected to the first

  first socket by matching shapes, for axial stop

of the latching device.

  The indexing tongue can also be connected to one of the annular parts, while the claws can be respectively placed on one of the C supports, on the side

  of these which is turned away from the annu-

  laires. The nestable coupling can, moreover, be mounted for rotation on the two fluid circulation conduits. That

  permanently allows, in the integrated state, the circulation conduits

  tion of the fluid, to rotate the nestable coupling until

  only at a position such that the second projection of the tongue

indexing is easily visible.

  The invention will now be described in more detail,

  title of example in no way limiting, with regard to the drawings an-

on which:

  Figure 1 is an axial section showing a coupling

  nestable according to the invention, and the conduits

  culation of a fluid in the coupled state;

  Figure 2 is a second axial section of the coupling-

  ment according to the invention and conduits in the coupled state, however occupying a position offset by 90 relative to Figure 1; Figure 3 is a section along line D-D of Figure 2; Figure 4 is a section along the line G-G of Figure 2;

  Figure 5 is an exploded illustration of the delivery

  fully according to the invention, and of the two conduits; and Figure 6 is a perspective representation, with

  axial section at right angles to the coupling in accordance with the

  vention and the two conduits in the coupled state.

  To connect a first fluid circulation conduit 1 to a second fluid circulation conduit 2, the interlocking coupling illustrated (see in particular FIG. 5) is

  consists of a first socket 3, of a snap-on device

  stage 4 and a second bushing 5. While the conduits 1, 2 preferably consist of a metal, but may however also consist of a plastic material, the bushings 3, 5 and

  the device 4 preferably consist of a ma-

  plastic. Sealing rings 6 are moreover housed, between the conduits 1 and 2 connected to each other, in

  peripheral grooves 7 of the second conduit 2.

  The first conduit 1 for circulation of the fluid present,

  at its end located on the coupling side, a retaining rib

  bare 8 projecting outwards, in the radial direction, and covered

  both the shape of a collar bent radially outwards

  laughing. The second fluid circulation conduit 2 comprises

  a second retaining rib 9 presenting itself as an adhesive

  rette which projects radially outwards, but is however at a certain axial distance from the free end situated, in the coupled state, inside the first conduit 1 for circulation of the fluid. The two retaining ribs

  8 and 9 bear against each other in the coupled state.

  The first socket 3 has, in its wall, two openings

  diametrically opposed 10, provided with edges 11 and 12 (fig.

  gures 1, 5 and 6) which are turned towards each other in the axial direction of said socket 3, and are bevelled according to the

  same angle to the axial direction. The socket 3

  carries, in addition, a radially uninterrupted opening 13, in which a groove 14 extending axially from the external face of said bush 3 ends, radially

  the oblique inward. Axial stiffening ribs

  cation 15 extend on either side of the opening 13 and of the groove 14 from a flange 16, at one end of the sleeve 3, as close as possible to a flange 17 formed at the

  near the other end of said socket 3. Two ribs

  additional stiffening res 18 and 19 extend di-

  metrically opposite the ribs 15 (Figures 3 and 4). Two ribs 20 configured in T and diametrically opposite one another, only one of which is illustrated in FIG. 5 and is partially visible in FIG. 6, start from the flange 17. The socket 3 also has , on its internal face,

  a peripheral collar 21 projecting radially inward

  térieur and on the inner edge of which retaining arms 22

  extending axially, endowed with elastic flexibility and

  formally distributed around the perimeter, came from solid molding

  daire (Figures 1, 2 and 6). The arms 22 have, at their ends

  free mites, protuberances 23 which project towards

  the interior in the radial direction and through which they penetrate

  trent, in the coupled state, in an annular groove 24 of the

  cond conduit 2 for circulation of the fluid. When the socket 3 and the second conduit 2 fit together, the protrusions 23 slide, by an inclined surface 25 (FIG. 6), beyond a stop member 26 of low height shaped on the edge of the groove 24, until they snap into said

  groove 24. The collar 21 then comes to apply against the nerv-

  retaining plate 9, so that the sleeve 3 is connected to the duct

  2 by matching shapes (Figures 1, 2 and 6).

  The snap device 4 (see in particular FIG. 5) comprises two diametrically opposite elastic supports 27, respectively provided with a claw 28 formed at their free end in order to trap the first retaining rib 8, from behind, during the introduction of the first fluid circulation conduit 1 into said device 4. The

  claws 28 are provided, at their free ends, with a sur-

  inclined face 29 radially outer to come

  quer, in the inserted state of the first conduit 1, against one (12) of the edges 11, 12 of the recesses 10 which are turned towards each other; and a radially inner inclined surface 30, to come to bear against the first rib 8 during

  the introduction of the first conduit 1. In addition, the claws pos-

  a second radially inner inclined surface 31 which faces away from the free end of the supports 27 and is intended to come to bear against the first rib 8, in order to prevent an involuntary uncoupling of the first conduit 1. edges 11, 12 of the recesses 10 of the first sleeve 3, turned towards each other in the axial direction, are bevelled, relative to this axial direction, at the same angle as the inclined surfaces 29 radially outer of the claws 28, which claws 28 pass through said recesses 10 from the radially outer face of

  said first sleeve 3. The claws 28 are provided, by the way

  their, of chin pieces 32 projecting radially outwards.

  The supports 27 consist of rings substantially configured at C, curved in the peripheral direction of the first socket 3, and the ends of which are connected to one

  respective of two adjacent annular parts 33, which surround

  partially re-enter said first sleeve 3. The claws 28 are then respectively arranged on one of the supports 27 at C, on the side of the latter which is rotated opposite the annular parts 33. The supports 27 are endowed with elasticity like a spring Q. An indexing tongue 34, connected to one of the annular parts 33, has a large extent

  axial and can be bent elastically in the radial direction.

  Said tongue is provided with a first hook-shaped projection 35, elastically deformable and passing through the opening 13 of the bushing 3. The projection 35 has an inclined rising face 36, intended to mount on the first retaining nerve. 8 during

  the introduction of the first conduit 1 into the locking device

  quêtage 4. In the inserted state of said first conduit 1, the first projection 35 rests on the first rib 8 while being flexed radially outwards. The indexing tongue 34 is

  rigid in its longitudinal direction and comprises, exterior-

  rement in the radial direction, a second projection 37 penetrating, in the integrated state of the first conduit 1, into a radially uninterrupted hole 38 which is formed in the wall of the second

socket 5.

  The latching device 4 surrounds the socket 3, each rib 20 engaging, by its axial region, in a respective one of the interstices situated between the annular parts

  33, and the transverse region of said rib 20 trapped

  from behind, the ends of a support 27 considered

  (figure 6). This gives the device 4 an axial stop with respect to

socket screw 3.

  In the assembled state, the jaws 32 of the claws 28, projecting radially outwards, come respectively

  engaging from behind with a protrusion 39 projecting radially-

  inwards, beyond the second socket 5, the-

  which belt in turn the latching device 4 and the first socket 3; and is mounted, on said first socket

  3, sliding in the uncoupling direction in op-

  resting on the elastic force of the supports 27, with drive

  claws 28 by means of the studs 32.

  During the assembly of the second conduit 2 of circulation

  tion of the fluid with the interlocking coupling, the first sleeve 3 is first of all threaded onto said conduit 2, from the left considering FIG. 1, until its collar 21

  is applied against the retaining rib 9, and that the protrusions

  bérances 23 of the retaining arms 22 are snapped into the annular groove 24. In this position, the sleeve 3 is connected to the duct 2 by matching shapes. Then, the latching device 4 is respectively threaded or placed radially on the sleeve 3, from the left, considering Figures 1 and 5, or with the spacing of the annular parts 33; in this way, the axial regions of the ribs 20 engage in the interstices between said annular parts 33 and the claws 28 are introduced, through the recesses 10,

  a distance such that they protrude radially inward

  interior, as illustrated in Figures 1, 3, 4 and 6.

  In the sequence, the second sleeve 5 is threaded onto the device 4 and onto the sleeve 3 until a collar 41 in two parts, radially inside and cleaning in the end

  posterior of said sleeve 5, is applied against the adhesive-

  rette 17, said sleeve 5 then occupying, with respect to said device 4, an angular position such that the jaws 32 of the claws 28 pass opposite the jaws 39, in axial grooves 40 shaped next to said jaws 39 of the

  second sleeve 5, then trap said chins 39 by-

  behind, in radial grooves of said studs 39, after a rotation of the sleeve 5 relative to the device 4 and to the sleeve 3. The projection 37, formed on the indexing tongue 34, is then aligned with the hole 38 made in the wall of

the second socket 5.

  At the successive stage, the first circulation duct 1

  fluid is introduced into the plug-in coupling in French

  crimping the end of the second fluid circulation conduit 2 which is provided with sealing rings 6. The rib of

  retainer 8 of the conduit 1 then abuts against the surfaces

  clinches 30 of the claws 28, so that said claws 28 are pushed obliquely outward in the radial direction, through the recesses 10, opposing the elastic force of the supports 27. As soon as the rib 8 was animated by a movement

  opposite the edge of the claws 28 which occupies, radially, the po-

  innermost position, said claws 28 slide again

  calf obliquely inward radially behind

  said rib 8, under the action of the elastic force of the sup-

  ports 27, up to the position illustrated in FIGS. 1, 2 and 6, in which the conduits 1, 2 are coupled to each other and the claws 28 trap the rib 8 from behind, using of their inclined surfaces 31. In this position, the retaining ribs 8 and 9 of the conduits 1 and 2 carry one

against each other.

  Now, if the internal pressure of the conduits 1 and 2 for circulation of the fluid exerts its effect, or else said conduits 1 and 2 are subjected, from the outside, to the action of an axial force tending to dissociate these conduits 1 and 2 from one another in the axial direction, the retaining rib 8 exerts a

  thrust against the inclined surfaces 31 of the claws 28 and the

  said claws 28 exert a thrust, by their surfaces

  clinches 29 radially outer, against the beveled edges 12 of the recesses 10, so that said claws 28 tend to move obliquely inward in the radial direction, on said beveled edges 12, and to press said rib 8 all the more firmly against the retaining rib 9. As a result, the push-in coupling can withstand large

  dissociation forces applied to conduits 1 and 2.

  When introducing the duct 1 for circulation of the

  fluid in the nestable coupling, the inclined face ascends

  dant 36 of the projection 35 of the indexing tongue 34 rises simultaneously on the retaining rib 8 of the first conduit 1, until said projection 35 rests on said rib 8 in the fully inserted state of said conduit 1, as shown in Figures 2 and 6. In this position, the tongue 34 is bent radially outward, so that the projection 37 enters the hole 38 of the sleeve 5, and is easily visible from the outside. The fact that the projection 37 is visible is a sure indication of the correct connection of the conduits 1 and 2

with each other.

  In order to ensure that the projection 37 is easily located

  ble, also in all positions of integration of ac-

  nestable coupling, said nestable coupling can rotate on the conduits 1, 2 for circulation of the fluid. It can thus be brought permanently, by rotation, to a position

  such that the projection 37 faces the observer.

  To deliberately uncouple conduits 1 and 2 from

  circulation of the fluid, the projection 37 (and therefore the tongue of

  dexage 34) must be pushed radially inward at

  using a simple tool, for example a screwdriver, in the es

  free space formed by the groove 14 between the tongue 34 and the sleeve 3, with simultaneous deformation of the hook-shaped projection 35, to a position in which the projection 37 occupies a radial location inside the sleeve 5 ; as well as said sleeve 5 must be pulled, by hand, to the left while considering Figures 1, 2 and 6. In this case, the

  chucks 39 drive the claws 28 obliquely towards the ex-

  radially inward, by means of the studs 32 of the latter, opposing the elastic force of the supports 27, until the said claws 28 are released from the retaining rib 8. A present, conduit 1 can be

  extract of the nestable coupling.

  It goes without saying that many modifications can

  be made to the push-in coupling described and shown

  felt, without departing from the scope of the invention.

-RE V E N D I C A T I ONS-

  1. Interlocking coupling for connecting two conduits (1, 2) for circulation of a fluid, among which the first

  conduit (1) has a first retaining rib (8), comprising

  taking a first socket (3) whose wall has openings

  dements (10) provided with edges (11, 12) turned towards each other in the axial direction of the first sleeve (3); a latching device (4) provided with supports (27) endowed with elastic flexibility and provided, respectively, with a claw (28) which is formed at the free end of said supports, can slide axially and radially with respect to the first sleeve (3) and is intended to trap the first retaining rib (8), from behind, during the introduction of the first

  conduit (1) in said latching device (4), the grif-

  fes (28) having, at their free ends, a surface

  clinched (29) radially outer to come to be applied, in the inserted state of the first conduit (1), against one (12) of the edges (11, 12) of one of the recesses (10), which are turned on each

  towards the others, and a first inclined surface (30) radial-

  inner, to come and apply against the first nerv-

  retaining frame (8) during the introduction of the first conduit

  (1), and being provided with a second inclined surface (31) radiating

  LEMENT INNER, which is turned away from the free end of the supports (27) and is intended to be applied

  against the first retaining rib (8), when uncoupling-

  ment of the first conduit (1); and at least one waterproof ring-

  ment (6) between the first conduit (1) and the second conduit (2) connected to the latter, coupling characterized in that the latching device (4) surrounds the first sleeve (3) with axial stop, and is provided with an indexing tongue (34) which can be bent elastically, present on a first

  projection (35) penetrating through an opening (13) of the first

  first socket (3), a rising inclined face (36) intended for mounting

  ter on the first retaining rib (8) during insertion

  tion of the first conduit (1), and rests on the first retaining rib (8) in the inserted state of said first conduit (1), by the

  first projection (35), being bent radially outward; and by the fact that the second conduit (2) is connected to the

  first socket (3) by matching shapes.

  2. Nesting coupling according to claim 1, characterized in that a second sleeve (5), surrounding the latching device (4), is slidably mounted on the first sleeve (3) opposing a force elastic of

* supports (27), with claw drive (28) towards a po-

uncoupling.

  3. Nesting coupling according to claim 1 or 2, characterized in that the edges of the recesses (10) of the first sleeve (3), facing towards each other in the axial direction, are beveled, relative to this direction

  axial, at the same angle as the inclined surfaces (29)

  external dialing of the claws (28), and said claws

  (28) pass through said recesses (10) from the flat face

  external dialing of said first socket (3).

  4. Nesting coupling according to claim 2, characterized in that the indexing tongue (34) is

  rigid in its longitudinal direction and comprises, exterior-

  rement in the radial direction, a second protrusion (37) penetrating, in the integrated state of the first conduit (1) for circulation of the

  fluid, in a radially uninterrupted hole (38) which is pra-

  ticked in the wall of the second socket (5).

  5. Nesting coupling according to claim 4,

  characterized by the fact that the claws (28) are provided with

  lugs (32) projecting radially outward and respectively engaging, from behind, with a flange (39) projecting radially, inwardly, beyond the second bushing (5); and there is formed, between the first sleeve (3) and the indexing tongue (34) resting on the first retaining rib (8), a free space by which, by applying to the second projection (37) of the tongue indexing (34), penetrating into the hole (38) of the second bushing (5), a directed force

  radially inwards, said tongue (34) can flex

  chir to a position in which the projection (37) of this tongue (34) occupies a radial location inside the

second socket (5).

  6. Nesting coupling according to any one of

  Claims 1 to 5, characterized in that the first

  projection (35) of the indexing tongue (34) is elastically deformable. 7. Nesting coupling according to any one of

  Claims 1 to 6, characterized in that the first

  projection (35) of the indexing tongue (34) takes the form of a hook. 8. Nesting coupling according to any one of

  Claims 1 to 7, characterized in that the supports

  (27) consist of rings substantially configured in C, curved in the peripheral direction of the first

  socket (3), and the ends of which are connected to one respec-

  tive of two adjacent annular parts (33) which surround

  partially said first socket (3).

  9. Nesting coupling according to claim 8, characterized in that the indexing tongue (34) is

  connected to one of the annular parts (33).

  10. Nesting coupling according to claim 8 or

  9, characterized in that the claws (28) are respective-

  placed on one of the supports (27) in C, on the side of these

  which is turned away from the annular parts (33).

  11. Nesting coupling according to any one of

  Claims 1 to 10, characterized in that it is mounted on

  rotation on the two conduits (1, 2) for circulation of the fluid.