FR2839899A1 - Adapter for connecting a paint pot to a mixing machine has couplings for machine and pot, intermediate elements and locks - Google Patents

Abstract

The adapter has a first coupling (14) for attaching to a connector (22) on the mixing machine, a second coupling (3) for the open end (41) of the paint pot, intermediate elements (10, 13) that extend lengthwise between the first and second couplings, locking elements (11, 12) to engage with locks (31, 32) on the machine, and others (2, 4) to engage with the outer rim (42) of the paint pot. The second set of locking elements (2, 4) is integrated with the second coupling (3) to form a collar that fits over the pot rim with a recess for a seal (5).

Description

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  The present invention relates to an adapter for connecting a pot of paint or other product to be mixed or homogenized before use, and a machine for mixing the contents of the pot. The paints used in the industry are generally a mixture of several primary bases which are mixed in well defined proportions. In order for the entire mass of paint to present the desired shade uniformity, the primary bases are subjected, in a mixing machine, to mixing by blades mounted at the end of one or more vertical trees which descend into the pot. . To avoid overflows, the classic lid of the pot is temporarily replaced by a homologous attached lid, crossed by the stirring shafts and

pose with sealing on the pot.

  s In some cases, the jar is initially defective when it is placed in the mixing machine and it is this which provides the desired doses of

  different bases, through pouring bees.

  Due to the vibrations generated by the rotation of the blades, the pot is likely to slide on the laying surface which carries it, so that the temporary cover must be fixed to the pot to maintain the desired seal

  and so that the blades do not hit the wall of the pot.

  In the case of the automotive industry, the edge of a paint bucket has a radially internal excess thickness forming a kind of internal bead neck, the diameter of the bottleneck is good

determined.

  The lid of the pot constitutes a kind of T-shaped stopper which is reinforced so that the cylindrical base comes to be housed, with adjustment, in

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  the section left free by the bead. The cover is thus stuck and

  held in place by friction and the adjustment ensures the desired tightness.

  The lid can be extracted by leverage, by sliding a blade between the upper edge of the T and the edge of the pot on which it was stopped when

enforcement.

  The mixing machine may have a temporary cover

  for the pot, having the same shape as the lid above.

  In addition or as a variant, the temporary cover includes hooks for hooking to the internal bead. Precisely, the temporary cover o is crossed by peripheral vertical rotary axes, carry, in the lower part, movable cams for axial anti-recur locking, or hooks, which descend into the neck of the pot to then deploy radially, by pivoting in a horizontal plane, under the bead and hold onto it, when

  the temporary cover is in the coupling position with the pot.

  s The cans of paint for various other industries, for example the building trade, also include a radial bead, for securing to the conventional cover of the pot, but the bead is external. The classic lid of the pot, then generally flat, is placed on the edge of the pot with a seal and is held in place by a strapping collar with edges, lower and upper, or folded towards the axis of the pot, thus trapping the edge of the classic flat lid with the outer rim of the pot. The collar constitutes a sort of distributed axial locking clip which blocks any relative, axial or even radial movement. In the absence of an internal bead in a pot, it is therefore impossible to use the mixing machine with pots other than those for the automobile. In addition, the volume of pots for various other industries is greater than that of pots for the automobile, so that their rim has a diameter which exceeds the diameter of connection of the machine.

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  The painting of the pots free from internal bead was therefore conventionally prepared manually, which risked causing metering errors and / or allowing to persist in inhomogeneities in the mixture. s The present invention aims to avoid this kind of disadvantages, by allowing the use, with pots free of internal bead, mixing machines provided to maintain their coupling with the pot by means of the internal bead thereof. It will be noted that, since it is a mechanical problem, of connection by locking or detachable coupling, the invention is independent of the fluid content of the pots, that is to say that it can be act with products other than paint or varnish. In the rest of this presentation, it will therefore be understood that the word paint can design paint just as well as other fluid products to be mixed. Furthermore, the pot is generally qualified as a "paint" pot, that is to say that it is a vice pot, which the machine will first fill to carry out the mixing operation, or a can of paint that has

previously filled.

  To this end, the invention relates to a connection adapter between, on the one hand, a machine mixing the contents of a jar, painted or equivalent, the machine comprising means, of determined size, for coupling with a mouthpiece of the pot and comprising removable locking means, agencies for cooperating with an internal relief of the mouth of a pot of a first type in order to maintain said coupling, and, on the other hand, a pot of a second type, a paint or equivalent, comprising a mouthpiece, with a cross section of determined size, having an external relief with radial extension, the adapter comprising: - first coupling means to the coupling means of the machine,

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  - second coupling means at the mouth of the pot of the second type, and - intermediate means for longitudinal passage between the first and second coupling means, the adapter further comprising: - first machine locking means , agencies to cooperate with the locking means of the machine, and - second locking means, agencies to cooperate with

  the external relief of the pot of the second type.

  o The adapter thus functionally presents a standard interface, first means of coupling and locking, equivalent to the interface of the mouth of the pot of the first type, for which the machine is provided, which therefore allows the mounting of the 'adapter on it. Dimension pot of the second type, with external relief such as bead, the second means, of coupling and locking, allow the coupling to the pot and the maintenance of this one thanks to the cooperation, between the second means of locking and

the bead or equivalent.

  The second locking means can be provided to ensure by themselves the locking with the external relief of the pot of the second type. This wind, for example, flexible, and / or pivotally mounted gripping steps on the body of the adapter, extending axially and carrying the respective hooks in the free end, radially turned towards

  the interior, for entering the external bead.

  The second locking means may, however, only provide indirect cooperation with the bead of external relief, that is to say be provided to cooperate with additional locking means intended to ensure the desired joining between the adapter. and the pot of the second type. The additional means can for example be a collar trapping the bead of external relief with the second means

o locking.

  In an advantageous embodiment, the first locking means comprise a turned shoulder opposite the first

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  coupling means of the adapter and connecting two sections, tubular cons of

intermediate means of passage.

  The fastening locking of the adapter to the machine can thus be carried out very simply, by hooks or cams of axial anti-recoil

s bearing on the shoulder.

  In particular, the two sections, cons can be presented substantially in the form of a skirt, with a longitudinal section of stepped shape, of adaptation of section between the size of the coupling means of the machine.

  and the size of the mouth of the pot.

  o The two trunks, ons thus allow a size adaptation of

  cross section between the mixing machine and the pot.

  Advantageously, the second wind locking means integrated with the second coupling means in the form of an external flange, limited by a transverse surface of the second coupling means and by an opposite surface for receiving an edge of the collar of

  joining with an external flange of the pot.

  The adapter thus presents a very rational structure, with a

minimum of specific parts.

  The flange may in particular comprise a receiving groove o of a seal, open in the longitudinal direction to cooperate with

['mouth of the pot.

  In a particular embodiment, the intermediate passage means have, in longitudinal section, a wall with a substantially U-shaped section, the branches of which constitute jaws of a connector, first locking means, agency for receiving and maintain a cover edge, with longitudinal extension, belonging to the

  machine locking means.

  The adapter can thus easily be mounted on the machine, by

  simple pressure to clip the cover edge into the connector.

  o In particular, a section, end con of one of the branches of the U can carry the first coupling means to the machine, and a section, con

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  end of the other branch can carry the second coupling means

  and the second locking means.

  In a particular embodiment, the connector comprises two sections, concentric radially opposite cons, from the bottom part of the branches of the U. and is extended longitudinally by a widened mouth portion of the U. internally bounded by a section, con higher 'a radially internal branch of the U connecting to the section, bottom con of said internal branch by a shoulder, with transverse extension,

  belonging to the first locking means.

  o The first coupling means and the second coupling means can in particular extend substantially in the same transverse plane.

  The longitudinal size of the adapter is thus limited.

  The invention will be better understood using the following description

  of a preferred embodiment of the adapter of ['invention and of a variant, with reference to the accompanying drawings in which: - Figure 1 is a side sectional view of the preferred shape of the adapter of [' invention, couple to a pot cover of a mixing machine, o - Figure 2 is a top view of the cover with the adapter of Figure 1, - Figure 3 is a sectional side view of an adapter depending on the variant, and - the figure 4 corresponds to FIG. 3, the adapter being coupled to a

  s pot cover of mixing machine.

  The adapter, marked with the reference 1 in FIGS. 1 and 2, presents, in this example, a circular cross section of axis 21 and a longitudinal section in the form of a tiered skirt. Axis 21 generally constitutes here a

  geometric axis for the set of functional elements represented.

  o The adapter 1 relics a can of paint 40, on which it is placed, to a mixer assembly 20, of mechanical elements for mixing the contents of the

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  pot 40, belonging to a mixing machine the other parts of which are not shown. For the clarity of the drawing of FIG. 1, the pot 40 is only represented by two axially opposite partial sections of its upper edge wall, and the adapter 1 occupies a relative position slightly higher than its final functional position of coupling to the pot 40. The pot 40 has a mouth 41 of determined size which has a radially external relief 42, here in the form of a bead on the upper edge of the pot 40, bounded by an upper coupling surface 43 extending substantially in a radial, that is to say horizontal, plane in the functional position of FIGS. 1 and 2. The upper surface 43 is a surface for receiving a conventional flat cover of the pot 40. A lower surface opposed to the counter support 44, with a substantially radial extension, limits the bead 42, in order to receive a collar 50 for fixing to the adapter

1, described later.

  The skirt of the adapter 1 comprises a lower rod 10 of tubular shape connected, by a shoulder 11 with radial extension, to an upper tubular rod 13 of more falble section ending in the upper part by an upper edge 14 of connection by tight coupling to the mixer assembly 20. The upper edge 14, horizontal in the functional position, o thus extends in a transverse plane, therefore radial since there is here a geometric axis 21. The shoulder 11, horizontal in the functional position, present a lower surface 12, internal to the adapter 1, forming a circular ring or track extending in a substantially radial, or transverse plane, turned opposite to the upper coupling edge 14. The section, lower con 10 s' flourishes in the lower part by a radially external relief, here in the form of a lower flange 2 for connection by tight coupling to the pot 40. The sections, tubular cons 10 and 13 thus constitute an intermediate passage connected ant the upper edge 14, of coupling with

  the mixer 20, with the lower flange 2 for coupling to the pot 40.

  o The flange 2 has a lower radial surface 3, for coupling to the upper surface 43 of the mouth 41, of size corresponding to the latter. The lower surface 3 of the flange 2 has a groove

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  circular 5, open (longitudinally) towards the teas, done opposite the section, skirt con 13 having the upper coupling edge 14. The groove partially houses a seal 6 in the form of an O-ring seal, intended to come in contact with the upper surface 43 of the mouth 41. The flange 2 is bounded by an upper surface of substantially horizontal abutment 4, therefore with radial extension, rotated opposite the lower coupling surface 3. The diameter collar 2 external

  corresponds substantially to that of the external bead 42 of the pot 40.

  The flange 2 thus integrates, in this example, the lower or coupling surface 3 and the counter-bearing surface 4. As a variant, this rear could belong to one or more distinct external radial projection elements

of the collar 2.

  It should be noted that the facing coupling surfaces 3 and 43 need not necessarily come into mutual contact according to a closed contact strip, which would here be in a circle. Indeed, it suffices that the O-ring 6, projecting axially from the groove 5, is crushed sufficiently against the opposite surface 43. The lower surface 3, carry the seal 6, can therefore comprise a crown of a few axial protruding strokes or pastes of bearing on the lower coupling surface 43, forming spacers for adjusting the crushing of the seal 6 and arranged for example in a circle of

  diameter different from that of O-ring 6.

  The mixing assembly 20 comprises a cover 22 having a lower surface with a joint in the form of a circular track 23, extending in a radial plane, of connection to the adapter 1, that is to say of

  s reception of the upper coupling edge 14 of the section, tubular con 13.

  The cover 22 is traversed by, and even here carries, a vertical shaft 29 comprising, at the lower end, blades, not shown, for mixing the contents of the pot 40. The cover 22 ends here by a lower skirt 25 in which comes to accommodate the adapter 1. Precisely, the lower skirt 25 then surrounds, with adjustment, the section, lower con 10, so

  center adapter 1 on assembly 20.

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  The reference 31 designates a rotary locking axis, parallel to the axis 21, for the operation of an axial anti-recur locking cam 32, designed to slide under a bead, radially internal, of a mouth of a classic pot, of a first type, of paint for the automobile, for which the set 20 is provided. As illustrated in FIG. 2, there are in fact here a plurality of four locking pins 31 with cam 32,

  distributed angularly around axis 21.

  The locking pin 31, integral in translation with the cover 22, is actuated in rotation by means of an upper lug or knurling wheel, so that the cam 32, initially in the folded back position towards the axis 21, takes a position Radially deployed to come to bear on the lower counter-support part of the internal flange of the conventional pot when the lid 22 rests on the pot. The locking cam 32 thus constitutes a sort of hooking claw to the internal bead, which therefore blocks any axial movement of recur, or even radial, of the conventional pot relative to

['mixer set 20.

  Reference 26 designates a plurality of elastic steps intended to grip the edge of a conventional pot in order to maintain the centering thereof.

on ['set 20.

  o The functions of adapter 1 will now be explained in more detail. The main function of the adapter 1 is to allow the fixing of the pot 40 of the second type, free of internal bead, to the mixing assembly 20. In addition, in this example, the adapter 1 allows a size adaptation, here in diameter, between the diameter of the mouth 41 and the lower coupling surface 23 of the assembly 20, the circular track of which is of limited diameter for the reception of a conventional pot edge, of the

first type, for the automobile.

  For fixing the pot 40 of the second type to the mixing assembly

  so 20,1'adapter 1 is secured to each of these.

  For this purpose, the shoulder 11 of the adapter 1 constitutes a relief with radial extension which, by its lower surface 12 turned opposite to the

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  The assembly 20 provides the same counter-support function as the internal rim of the conventional pot, of the first type. The upper edge 14 of the adapter 1 can thus be kept couple by plating against the lower coupling surface 23 of the assembly 20, the section, upper con 13 of the adapter 1 replaces, thus cant the internal flange of the pot classic. The axial length of the section, con superior 13 is therefore provided as a function of the

  useful length of the locking pin 31.

  It should however be noted that, as a variant, the adapter 1 could have only a single section, tubular con 10, 13 of uniform section, therefore not to be provided for an adaptation of diameter or shape of non-circular cross section. . However, it would then be necessary to provide an internal collar, or equivalent relief, in this section, single con (10, 13) to receive the locking cams 32. It would be the same if the adapter skirt 10, 13 did not have , internally, the external form is here

  represented, but simply a conical shape.

  The pot 40 is secured to the adapter 1 by cooperation between the lower counter-bearing surface 44 of the external bead 42 and the

  upper surface 4 of abutment of the collar 2 of the adapter 1.

  Specifically, the outer bead 42, plate with sealing, by its upper surface 43, on the lower surface 3 of the flange 2, is secured, in a manner, removably con, with it, to block any relative movement of spacing axial or even off-center. To this end, the upper surface 4 of the flange 2, and the lower surface 44 of the outer bead 42 serve as supports, turned in directions at least partially axially opposite, for removable elements ensuring axial locking. It is a kind of stapling or, alternatively, of tightening by

axial clamping of jaws.

  In this example, as already mentioned, it is a collar or clip 50 which is attached around the collar 2 and the bead 42, the collar 50 o having, in longitudinal section along the axis 21, a section with edges, upper and lower, folded towards the axis 21, to trap at least the radially external edges of the upper 4 and lower 44 surfaces forming lips projecting radially. For clarity of the drawing, the collar 50 is represented by only its two sections on either side of the collar 2, the dotted line showing the relative position provided for the collar 50, relative to the collar 2, when the edge of the pot 40 will actually be in contact with the lower surface 3 of the flange 2. The coupling of the pot 40 with the adapter 1 can be carried out by lowering the adapter 1 with the assembly 20 or by lifting a laying surface

  of the mixing machine, carry the pot 40.

  A purely radial extension of the abutment surfaces 4 and 44 o is not a necessity, insofar as the outer edges of these can be grasped by the collar 50 or equivalent, to exert an axial locking pinch in relative position , without risk of release by a parasitic radial sliding of the latter. The counter-bearing surface 4 could in particular have the shape of a conical skirt. The collar 50 has here, in a plane containing the axis 21, a C-shaped section open towards the axis 21, whose folded edges, having here a certain elasticity, are applied to the surfaces 4 and 44 against -pressure, in practice here on the rounded edges thereof. In this example, the collar 50 is the collar used to fix the final, flat cover of the pot 40. The collar 50 o comprises a conventional toggle device for opening it and for locking it under tension. It is therefore equivalent to a cylindrical slice of

  elastic material, such as rubber.

  It should be noted that the purpose of the assembly 20 is to avoid paint overflows. It can therefore constitute a watertight cover, as here, or simply constitute a vertical extension raising the edge of the pot 40,

  without the need for a lid proper to close the pot.

  It has thus been described above an adapter 1 for connection between, on the one hand, a machine mixing the contents of a pot, with paint or equivalent, the machine comprising elements 22, 23 of determined size, or coupling with the mouth of the pot and comprising removable locking elements 31, 32, agencies for cooperating with an internal relief, such as a bead, of the mouth of a pot of a first type in order to maintain the

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  coupling, and, on the other hand, the pot of a second type 40, with paint or equivalent, of which the mouth 41, with a cross section of determined size, presents an external relief with radial extension 42, here a bead, s the adapter 1 comprising - first elements 14 for coupling to the coupling elements of the machine 22, 23, - second elements 3 for coupling at the mouth 41, pot 40 of the second type, and o intermediate elements 10, 13 of longitudinal passage between the first (14) and the second (3) coupling elements, the adapter further comprising: - first elements 1 1, 12 for locking the machine, agencies for cooperating with the locking means 31, 32 of the machine, and - second elements 2, 4 for locking agencies to cooperate

  with the external relief 42 of the pot 40 of the second type.

  Figures 3 and 4 show the alternative embodiment of the adapter. o In FIGS. 3 and 4, the elements which are homologous to those in FIGS. 1 and 2 bear the same reference, however preceded by the hundred 1. The

  following description therefore omits to repeat the details of constitution and

  operation. The adapter, reference 101, differs essentially from the adapter 1 s in that it includes a connector for receiving and holding locked a part of the temporary pot lid, belonging to the mixing machine. In addition, the collar 2 for cutting the pot has been offset radially so that it extends in a corresponding radial plane.

  substantially at the plane of the upper edge 14 of coupling to the machine.

  n / a The adapter 101 comprises the stepped skirt with the lower and upper rails 113, with coupling edge 114, connected by the shoulder 111 with a lower transverse surface 112 of abutment. The wall of the adapter 101 has, in longitudinal section along the axis 121, a generally U-shaped open upward, with a bottom 115 and an internal branch formed by the skirt 110, 111,113. The base or bottom 115 of the U is extended upwards by an external branch 116, of cylindrical shape, the free end of which flourishes in a flange 102 bounded by an upper counter-bearing surface 104 and a lower surface 103 , coupling to pot 140,

  having a groove 105 with an O-ring 106.

  Figure 4 also shows the adapter 101, but coupled to a cover 122 of the mixing machine. For the clarity of the figure, the tree

  o central 29 blade holder has not been drawn.

  The cover 122 has a flat wall 127 of circular shape extending in a horizontal transverse or axial plane relative to the axis 121. The flat wall of cover 127 has a lower surface with a coupling joint 123 in the form of a track circular. The edge of the flat wall 127 s is extended by a descending edge in axial projection of cylindrical shape 128. As a variant, the projection 128 is limited to a few longitudinal steps,

  distributed around the edge of the flat wall 127.

  As shown in FIG. 4, the cylindrical descending edge 128 is of diameter, thickness and axial length such that its free lower end or o is accommodated with adjustment, by axial displacement, between the trunk, the bottom 110 of the bottom the internal branch of the U of the adapter 101 and the external wall 116, on the other side of the U. The branches of the U thus constitute a pad of jaws forming a female connector for receiving and holding in relative position the edge 128 a axial extension of the cover wall 127. The holding in position is ensured by a friction clamping contact. The upper coupling edge 114 of the adapter 101, which comes into abutment on the lower surface of the coupling joint 123, limits the depth of insertion of the edge 128 into the connector, which avoids excessive blocking with permanent deformation.

of it.

  Locking pins (31), carrying respective locking cams (32), can be provided to guarantee better locking

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  in position, by cooperation with the lower surface of the abutment 112 of the shoulder 111 or even with the lower surface of the bottom 115 of the U. Thus, in this variant, the intermediate passage elements, 113 have, in longitudinal section, a wall with a substantially U-shaped section, the branches of which constitute jaws of a connector 110, 113, 115, 116, belonging to the first locking elements, agency for receiving and maintaining the edge of the cover 128, with longitudinal extension, belonging to the locking elements of the machine. o A section, end con of one of the branches of the U carries the first coupling elements 114 to the machine, and a trunk, one end of the other branch 116 carries the second coupling elements 103 and the

  second locking elements 102, 104.

  The connector 110, 113, 115, 116 thus comprises two sections, concentric radially opposite cons, from the bottom part 110, 116 of the branches of the U. and is extended longitudinally by a part of the enlarged mouth of the U. internally bounded by the section. , upper con 113 of the internally internally connected 110, 113 of the U connecting to the bottom section 110 of the internal branch 110, 113 by the shoulder 111, o 1 12, with transverse extension, belonging to the first locking elements. The first coupling elements 114 and the second coupling elements 103 extend substantially in the same plane

  transverse, which limits the vertical size of the adapter 101.

  An attached collar 150 traps the collar 102 with the external bead 142 of the mouth 141 of the pot 140, bounded by the upper coupling surface 143 and by the lower counter-bearing surface 144, and the

  thus maintains the adapter 101 and the pot 140 in their relative position.

  It must be obvious to those skilled in the art that the

  present invention allows embodiments under many

  o other specific forms without departing from the scope of the invention as claimed. Therefore, the present modes of

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  realization should be considered as an illustration but may be

  amends in the area defined by the scope of the appended claims.

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Claims (9)

  1. Connection adapter (1, 101) between, on the one hand, a machine mixing the contents of a jar, with paint or equivalent, the machine comprising means (22, 23, 122, 123), of determined size , of coupling with a mouth of the pot and comprising removable locking means (31, 32, 128), agencies for cooperating with an internal relief of the mouth of a pot of a first type in order to maintain said coupling, and, on the other hand, a jar of a second type (40, 140), with paint or equivalent, comprising a mouthpiece (41, 141), with a cross section of size or determined, presenting an external relief with radial extension ( 42,142), the adapter comprising - first means (14, 114) for coupling to the coupling means of the machine (22, 23, 122, 123), - second means (3, 103) for coupling at the mouth (41 , s 141) of the pot of the second type, and - intermediate means (10, 13, 110, 113) for longitudinal passage between the first (14, 114) and the second (3, 103) medium ns of coupling, the adapter further comprising o - first means (11, 12, 111, 112), for locking the machine, agencies for cooperating with the locking means (31, 32, 128) of the machine, and - second means (2, 4, 102, 104), for locking the external relief (42, 142) of the pot of the second type, agencies for being secured to it by cooperation with means (50, 150) removable fastening. 2. Adapter according to claim 1, wherein the first locking means comprise a shoulder (11, 12, 111, 112) rotates ['opposite the first coupling means (14, 114) of the adapter and connecting two sections , tubular cons (10, 13, 110, 113) means passing intermediaries.   3. Adapter according to claim 2, in which the two trunks, ons (10, 13, 110, 113) are substantially in the form of a skirt, as a longitudinal section of tiered shape, of section adaptation between the waist means for coupling the machine (22, 23, 122, 123) and the size of   ['mouth (41,141) of the pot (40,140).   4. Adapter according to one of claims 1 to 3, wherein the   second locking means (2, 4, 102, 104) integrated with the o second coupling means (3, 103) in the form of an external flange (2, 102), limited by a transverse surface (103) of the second coupling means and by an opposite surface (104) for receiving a collar edge   (50, 150) for securing with an external bead (42.142) of the pot.   5. Adapter according to claim 4, wherein the flange (2, 102) has a groove (5, 105) for receiving a seal (6, 106), open in longitudinal direction to cooperate with ['mouth (41.141) from the pot.   6. Adapter according to one of claims 1 to 5, wherein the   intermediate passage means (110, 113) have, in longitudinal section or section, a wall with a substantially U-shaped section, the branches of which constitute jaws of a connector (110, 113, 115, 116), first means of locking, agency for receiving and maintaining a cover edge (128), with longitudinal extension, belonging to the means machine lockout.   7. Adapter according to claim 6, in which a section, end con of one of the branches of the U carries the first means (114) for coupling to the machine, and a section, end con of the other branch (116) carries the second coupling means (103) and the second means of lock (102,104). 18 2839899   8. Adapter according to claim 7, in which the connector (110, 113, 115, 116) comprises two trunk, concentric radially opposite ons, from the bottom part (110, 116) of the branches of the U. and is extended longitudinally by a enlarged mouth portion of the U. internally limited by a section, upper con (113) of a radially internal branch (110, 113) of the U connecting to the trunk, the bottom (110) of said internal branch (110 , 113) by a shoulder (111, 112), extending   transverse, belonging to the first locking means.   9. Adapter according to one of claims 6 to 8, wherein the   o first coupling means (114) and the second coupling means