FR3048052A1 - CONNECTING DEVICE, METHOD AND TOOL FOR PLACING SUCH A DEVICE - Google Patents

Abstract

the invention relates to a device for connecting a tube comprising a tubular body delimiting a channel having an inlet opening to an end of the tubular body, retaining means for sealingly securing an end portion of the tube in the channel, and a strapping ring to be mounted on the tube. The end of the tubular body comprises an indicator of elastic depression of the end portion of the tube in the channel. The strapping ring is intended to be mounted on the tube set back from the end portion of the tube by a distance such that the elastic insertion indicator cooperates with the strapping ring only when the tube is sufficiently engaged in the channel. so that the end portion of the tube cooperates with the retaining means.

Description

The current'; The invention relates to the field of circuits of. fluid transport and more particularly a device for the connection of a tube, especially in that: not exclusively, a tube of a braking circuit of a vehicle. putting: in place of such a device BACKGROUND TECHNOLOGY OF THE INVENTION.

It is known to connect a tube to another element (other tube, distributor, actuator, valve ...) of a pressurized fluid transport circuit by means of a connecting device comprising a body delimiting a channel having a first section connected to the other element and a second section arranged to receive an end portion of the tube and internally provided with means for sealing therein the tube end portion. These means conventionally comprise a fastening member such as a forceps or an internally toothed washer, and a sealing element such as an annular seal intended to be compressed between an outer surface of the tube, and a surface. In some applications, such a decrease in pressure can be dramatic, as is the case, for example, in the interior of the section, where the leakage of the connection device irreversibly leads to a decrease in the pressure of the fluid in the circuit. : a circuit of a vehicle braking system due to the safety of the driver and passengers is put in question because the decrease in pressure in the circuit may: render the braking system ineffective.

It is recognized that the presence of a leak in a circuit is often due to a bad assembly of the tube with the connecting device. It is in fact common that the tube is not fitted into the body of the connecting device sufficiently to be engaged in the element d'éta.ftçhéité. A bad fitting occurs generally because it is not easy to distinguish, when 1 / fitting, the insertion of the tube in the fastening element, the insertion, the tube in the sealing element .., and finally the arrival of the tube abutting. Assume that there is one. This is all the more difficult because there are many types of. fittings that involve different efforts and provide the operator with different sensations.

The presence of a leak in: a circuit can also be caused by one. defect. sealing elements of the connection, defect may be of different natures (manufacture, storage, mtttâge ,,, aging, ...). Such a leak is then independent of the quality of the fit of the tube in the. fitting and can occur immediately. after the first press release of the circuit as after, several months of service;

It is also recognized that the search for the defective connection is not always easy, especially in the case where the fluid is a gas such as for example in the braking circuit of a truck where a leak is difficult to detect visually.

It would therefore be advantageous to be able to check in service the tightness of the connections of such a circuit without necessarily measuring the pressure, but also to quickly identify the faulty connection or connections.

OBJECT OF .1 / INVENTION The invention therefore aims to provide a connection device to meet the aforementioned needs.

PRESENTATION OF; To this end, the invention proposes a device for connecting a tube of a pressure-sinking circuit. The device comprises a tubular body delimiting a channel opening on an end of the tubular body which contains a fastening member of an end portion of the tube in the channel, a sealing element connecting the tube with the tubular body and an ahticontamination seal mounted at an inlet of the channel.

According to the invention, the anticontamination seal is arranged and shaped to allow, in the event of a leak in the connection, the pressurized fluid to escape from the device by emitting an audible signal.

In this way, when the circuit is under pressure, the user will be warned of any sealing defect in the fitting, and more particularly of insufficient fitting of the tube in the fitting. In addition, the identification of the defective connector will be facilitated, since the user will only have to evaluate where the audible signal is located to find the offending connector.

According to an embodiment of the invention, the anticontamination seal is mounted immobile in the tubular body and comprises at least one orifice provided with a valve portion to allow the pressurized fluid to pass axially substantially; joint art i have friend na t ion.

In particular, the orifice has elastically deformable edges between a state of rest in which the orifice is closed and a state: deformed: in which the orifice is open.

According to a particular feature, the edges comprise two lips which, in their resting state, are pressed together against one another axially in the direction of the inlet. channel.

Advantageously, the device "comprises two orifices, namely a first orifice and a second orifice, the lips of the second orifice being oriented in a direction opposite to the lips of the first orifice.

In this way, the use of a soak for the mounting of the gasket is not necessary, the gasket being able to be mounted irreversibly in one direction or the other.

According to another embodiment of the invention, the anti-contamination seal is movably mounted in the tubular body and the end of the tubular body comprises openings ·, the anticontamination joint moves along the tube of a recessed position in which the anti-contamination seal prevents the intrusion of contaminant into the tubular body at a recessed position in which the anticoameralization seal: discovers at least a portion of the openings. to let the fluid under pressure escape.

In particular, the end of the tubular body includes a depression indicator of the end portion of the tube in the channel, the device comprising a strapping ring intended to be mounted on an end portion of the tube at a distance such that the piloting light cooperates with the strapping ring only when the tube is sufficiently engaged in the channel so that the end portion of the tube cooperates with the gypsy-hooking.

The ring of Cerclage thus acts as a visual indicator ensuring that the tube is sufficiently fitted to be secured in a sealed manner in the tuhulaifê body of the device;

According to a preferred embodiment of the invention, the driving indicator is arranged to emit an audible signal during its cooperation with the strapping ring.

The strapping ring then acts as a visual indicator but also sound to guarantee the proper fitting of the tube in the tubular body of the device.

According to a particular characteristic, the driving indicator comprises at least one elastically deformable blade having an end integral with the tubular body.

Advantageously, the blade is delimited in the tubular body by two axial grooves opening.

According to a preferred embodiment of the invention, the axial grooves constitute the openings;

According to a particular characteristic, the strapping ring has on its inner surface at least one hooking notch arranged to bite the outer surface of the tube and form an axial connection means of the strapping ring to the tube.

In particular, the strapping ring is shaped to be removable:

Of the. so, if the. The strapping ring has been put in place by an error on a tube or if it has been improperly positioned, the strapping ring may be. withdrawn from the tube or repositioned: ·, see reused on another · tube.

Advantageously, the strapping ring has an open state in which the strapping ring is free to slide along. of. tube, and a closed state: wherein, the inner surface of the strapping ring, bites the outer surface of the tube to axially immobilize the ring of the strapping on the tube.

According to a particular feature, the strapping ring is slotted, the ends of the ring, strapping being cohesive for interlocking each other when the ring is in closed condition.

In particular :, the ends of the ring comprise at least one toothing.

Advantageously, the strapping ring is visible from the outside of the device in use.

In this way, the .cerclage ring can in particular serve as a visual cue to identify · .the connection, connections circuit, for example: by producing · rings of strapping of several colors ··.

In a particular way, the ring of. .Concclage is arranged at the entrance of the channel. The invention also relates to a tool for the implementation of a ring: strapping on a portion • d7 end of a tube.

According to the invention, the tool comprises a tubular body defining a channel, for receiving an end portion of the tube, the cgrp.s having a stop, at the depression of the end portion of the. tube in the channel and opposite an end provided .d'un inlet of the tube in the. channel. The tool also includes a flange projecting axially from the end coaxially to the inlet port. The flange has an axial slot forming two ends each provided with an ear and is elastically deformable between an open state in which the flange is shaped to receive the ring ring in open state and a closed state in which the ears are close together. one to the other to bring the strapping ring into its closed state.

In this way, the positioning of the strapping ring on the end portion of the tube is easily achievable and repeatable.

Advantageously.,. .le .: tubular body has areas of; visualisations · to · visualize the contact, the end portion of the tube with the. stop ·. 1'enfoncement. It is thus possible to visually ensure that the tube is sufficiently engaged in the front channel to exert a clamping force on the collar via the lugs to move the ring ring from the open state to the closed state.

In particular, the viewing areas are openings. The invention also relates to a method for connecting a tube comprising the following steps: placing the strapping ring on the tube so that the strapping ring is set back a predetermined distance from the end portion of the tube, introduction of the end portion of the tube into the channel until the insertion indicator cooperates with the banding ring.

In particular, the method also comprises the following steps: threading the strapping ring open on the tube so that the strapping ring is set back from the predefined distance of the end portion of the tube, passage of the ring ring from the open state to the closed state.

In particular, an anti-contamination seal of the same color as the strapping ring is mounted in the tubular body at the inlet port.

DESCRIPTION OF THE FIGURES The invention will be better understood in the light of the description which follows, which is purely illustrative and. non-limiting, and should be read with reference to the appended figures, among which: - Figure 1 is an axial sectional view of a connecting device according to a first embodiment of the invention, - Figure 2 is a view In perspective of the connection device illustrated in FIG. 1, FIG. 3 is a partial view in axial section of the connection device illustrated in FIG. 1, in use. FIG. similar view to the. Figure 2 of the device, connection in service ..,. FIG. 5 is a view similar to FIG. 3 of the device in use, in which the sealing gasket is absent; FIG. 6 is an axial sectional view of a connecting device; according to a second embodiment of the invention, - Figure 7 is an axial sectional view of a connecting device according to a third embodiment of the invention, - Figure 8 is a perspective view of FIG. 9 is a detail view in section through a transverse plane of the strapping ring illustrated in FIG. 1 in an open state; FIG. 10 is a detail view similar to FIG. 9 in which the strapping ring is in the closed state, - Figure 11 is a perspective view of a particular embodiment of a tool for the establishment of the strapping ring illustrated in Figure 9 on a tube FIG. 12 is a view similar to FIG. 11 of the tool in FIGS. ervice for setting up the strapping ring. FIG. 13 is a side view of the tool illustrated in FIG. 11.

DETAILED DESCRIPTION OF THE INVENTION

With reference to FIGS. 1 and 2, and according to the first embodiment of the invention, the connecting device is generally designated at 1 and intended to be implanted in a circuit with fluid to provide the connection. a tab 2 to the rest of the fluid circuit. The connecting device 1 comprises a body 3, of tubular shape and here made in one piece, delimiting a channel 4. The body 3 comprises sections 3a, 3b, 3c coaxial to each other.

The first section 3a comprises a rigid end piece comprising at least one outer relief 5, for example fir teeth, allowing the section 3a to be engaged and anchored in: a bore: a component not shown of the -circuit circuit fluid in which the connecting device is intended to be implanted. The first section 3 has a bore equal to a bore; 6 forming a portion of the channel -4 ,.

The second: section 3b of the body; 3 delimits a bore 7 which forms a portion of the channel 4 and which has a diameter greater than the bore 6 of the first section 3a. The bore: 7; is formed according to an end portion of the tube 2 '. The length of the second; -section. 3b is substantially equal to - half; from that of first section 3a.

The third section. .30 delimits.- A bore 9 which forms a portion of the channel. 4 and which has a diameter; greater than the bore · 7 of the second, section 3b. The bore 9 is shaped to receive a seal 10 and holding means 1.1 for sealing the end portion 8 of the tube 2 in the channel 4. The length of the third section 3c is substantially: equal to three:,, untied ··· PU - second section · 3b.

The third section 3c also includes one. inlet port of channel 4 and, adjacent to it, two axial grooves 1: 2-. debutting, delimiting a blade 1.3. elastically deformable having a; end integral with the remainder of the third section 3c and an opposite end provided at .1 / orifice: entry channel 4 of a beürfélêt · 14 forming a witness, d'évoncement: As will be seen later. The axial grooves 12 extend substantially over one third of the length of the third section 3c, ie over a length substantially equal to hairline; of the second section 3b.

Seal; 10 is locked to the bottom 9 of the third section 3c and is blocked as a result of the retention means 11. .Means ·, retention ·; 11. 'comprise a clamp. ·, Lia mobile axially including an end portion ·; the most, the inside of the body is. provided with axial grooves delimiting between them arms, eiastically; deformable. A free end: arms elastically deformable a; an inner surface: provided with a roughness 11b for biting an outer surface 8a of the end portion 8 of the tube 2. The clip; 1.1a has, on the side of the free end of the elastically deformable arms, an outer surface 11c of frustoconical shape to cooperate with an inner surface 11d of a sleeve 11c fixed in the third section 3c of the body 3. The arrangement of the sleeve 11 and the clamp 11a is such that axial displacement of the clamp 11a to the inlet of the third section 3c; generates a radial displacement of the asperities 11b of the clamp 11a to the central axis of the body 3. The asperities 11b are shaped not to oppose the fitting of the end portion 8 of the tube 2 in the cana 1. 4 but also to oppose withdrawal of the tube 2 when it is sufficiently fitted to cooperate with the retaining means 11.

The device 1 has also a sleeve 15 mounted inside the body 3. One end of the sleeve 15 is integral with the body 3 at the junction of the first and the second section 3a, 3b. The sleeve 15 extends axially in the second and third sections 3b, 3c of the body 3 and is intended to be engaged in the end portion 8 of the tube 2 in such a way that the outer surface 16 of the sleeve 15 comes substantially to the contact of an inner surface 8b of the end portion 8 of the tube 2. The outer diameter of the sleeve 15 is thus substantially equal to the inside diameter of the end portion 8 of the tube 2, itself being substantially equal to the diameter of the bore 6 of the first section 3a, the sleeve 15 comprises a thickener 17 extending substantially between the first section 3a and the second section 3b to form a stop at the fitting of the end portion 8 of the tube 2 .

An anticontamination seal 18, also called a dust seal, is movably mounted in the bore 9 of the third section 3c in the extension of the seal 10 and the retaining means 11. The anti-contamination seal 18 is of substantially square section, the inside diameter of the anticontamination seal 18 being substantially equal to the outside diameter of the end portion 8 of the tube 2.

The anticontamination seal 18 has an outer surface around and radially projecting from which extends a first asperity 18a. The first one; roughness 1.8a. is in contact with the wall 9 of the third section 3c of the body 3: Symmetrical. the anticontamination seal 18 has a radially projecting and radially inner surface from which extends a second roughness 18b of substantially identical size to the first protrusion 18a. The second roughness ·. 18b is intended to be in contact with the outer surface 8a; the end portion 8 of the tube 2 is set back from the axial grooves 12, so that no solid contaminant can enter the connection device 1 when the end portion of the tube 8; tube 2 is sufficiently fitted into the channel 4 of the body .3.

The anticontamination seal 18 is movable between a depressed position in which the anti-contamination seal 18 is in contact with the retaining means 11, and a maximum withdrawal position in which the anticontamination seal 18 is in contact with the bead 14. the blade 13. This displacement is possible only in the presence of an axial force greater than the coefficients of friction between the first roughness 18a of the anticontamination seal 18 and the bore 9 of the third "section 3c of the body 3 of a and between the second asperity 18b of the anticontamination seal 18 and the outer surface 8a of the end portion 8 of the tube 2 on the other hand.

The connecting device 1 also comprises a ring ring 19 intended to be secured to the end portion 8 of the tube 2. As illustrated in FIG. 7, the strapping ring 19 is slotted so that it comprises a first end 19a and a second end 19b and is elastically deformable between an open state in which the ends 19a and 19b are spaced from each other and a closed state in which the ends 19a and 19b are in contact with each other. the other. The first and second ends 19a and 19b are shaped to cooperate with one another and thus comprise respectively a first and a second toothing 20a, 20b, one extending generally towards the inside of the strapping ring and the other towards the outside. , so as to be able to hang on to each other and to maintain the ring ring in a closed state.

The strapping ring 19 has a first recess 21a and a second recess 21b arranged inside the strapping ring. The. first and second. recesses 21a ·, 2: 1b extend over the entire width (measured parallel to the central axis) of the strapping ring: 19. so that the thickness {measured parallel to a diameter) of the strapping ring 19 is. local, diminished by half. The recesses 21a, 21b are thus arranged to facilitate the deformation of the strapping ring 19.

The strapping ring 19 has an inner surface having edges along each of which extends a first hooking bead 22a and a second hooking bead 22b. radial projection of the surface ·, inside {figure. The first, and second, hooking apertures 22a, 22b are arranged to bite the outer surface 8; of the tube. 2 when the ring ring is closed on the tube 2 and thus form means for axial connection of the end portion 8 of the tube Z. banded: strapping: 19.

The strapping ring 19 has an outer surface about and radially projecting from which extends a third roughness 23: ,,, the third, roughness 23 has a diameter substantially equal to that of the bore 9 so that it is in contact with the. ·· the bore 9 · of the third section 3c of the. body 3 when the end portion of the tube 2 is. received in the body 3 ·. The height of the. third roughness 23 · is meanwhile substantially equal to the height of the bead 14. · da blade 13.

In its open state (fig?), The strapping ring.:: 19, a. an inner diameter greater than the outer diameter of. ·, the end portion 8 of the tube 2. In the open state, the strapping ring 19 is thus free: to slide the Ibftg of the end portion 8 of the tube , 2 "

In its closed state (FIG. 8), the strapping ring 19 has an inside diameter substantially equal to the outside diameter of the end portion 8 of the tube 2 in such a way that the first and second asperities 22a, 22b bite the surface. 8a outer portion of the end portion 8 of the tube 2 to axially immobilize the ring ring 1.9 on the end portion 8 of the tube 2.

With sufficient clamping forces to make the teeth 20a, 20b cooperate by clipping, the strapping ring 19 can move from the open state to the closed state. The cooperation of the teeth 2Ga, 20b is facilitated via the presence of the first and second recesses 21a, 21b which create preferential zones of elastic deformation.

In the same way, the strapping ring 19 can pass from the closed state to the open state by means of, for example, adequate clamping forces or a substantially radial relative displacement of the second end 19b with respect to the first end 19a for disengage the teeth 2Oar 20b from each other.

The strapping ring 19 is therefore removable, that is to say that the strapping ring 19 is removable, repositionable, or even reusable.

The operation of the connection device 1 will now be detailed with reference to FIGS. 3 and 4.

According to FIG. 3, the strapping ring 19 is mounted on the tube 2 set back from the end portion 8 of the tube 2 by a predefined distance D corresponding to the length of the end portion 8 of the tube. ; 2 to be engaged in .le ;, device to ensure correct connection. The tube 2 .muni of the 'ring' of 'strapping 19' is fitted; on the sleeve 15 to introduce the end portion 8 of the tubè: · 2 in: lé "channel 4. .Dans ········································, at the end, the end portion; 8 of the tub.e. 2 ·. the ring 19 is fitted onto the sleeve 15 until the third roughness 23 of the ring 19 is in contact with the bead 14 of the ring. 13. The length of fitting is then substantially equal to the length of the blade. third section 3c of the body 3.

By continuing the fitting of the. tube. 2: in the second section 3b of the body 3, the third roughness 23 of the strapping ring 19 tends to deform the blade 13 by raising the bead 14.

When the fitting is sufficient., So that the third roughness exceeds the bead 1.4, the blade 13 recovers elastlquely its initial state of. rest by emitting an audible .signal assimilable. at a rattling sound · when its end arrives; · in contact with the tube 2. The .portion of end 8 dü. tube .. 2 then traveled roughly four fifths of 1. ' bore 7 of the second: section 3b of the body 3 and through the clamp 11a and the seal 10, so that the fitting of the tube 2 in the channel 4 is sufficient for the end portion 8 of the tube 2 is subject to in the channel 4 of the body 3.

The length of the fitting is in fact greater than the length of the bore 9 of the third section 3c in which the sealing gasket 10 and the retaining means 11 are mounted. The fitting length is also less than the possible fitting distance, on the sleeve 15 to allow the clipping ring to be clipped by the blade 13 before the end portion 8 of the tube 2 is in abutment against the shoulder 1.7 of the sleeve 15; ·

Any release force exerted on the tube 2 causes an axial displacement of the clip 11a, the asperities 11b of which are in contact with the outer surface 8a of the end portion 8 of the tube 2. The force the tightening exerted by the asperities 11b increases when the tube 2 recedes.

It is possible to continue the fitting of the tube 2 on the sleeve 15 until the end portion 8 of the tube 2 is in abutment against the shoulder 17 of the sleeve 15 without improving the sealing of the connecting device 1 and the retention of the tube 2 in the channel 4.

The audible signal emitted during the clipping of the strapping ring 19 by the blade 13 thus allows the operator to ensure that he has sufficiently fitted the end portion 8 of the tube 2 in the channel 4 without the need for pressurize the tube 2.

The audible signal is produced when, as the blade 13 returns elastically to its initial state, the planar surface of the blade 13 adjacent to the inner surface 14 'strikes the outer peripheral surface of the strapping ring 19 and / or the surface plane of the bead 14 just hit it. tube 2 behind,, 1a .. strapping ring 19. The power of the audible signal greatly depends on the speed with which the blade 13 goes from its deformed state to its initial state. The power of the audible signal is thus particularly related to 1 / inclination of the inner stirfâce 14 'of the bead: 14 and the fitting speed of the tube 2 in the channel 4. Ideally, the inner surface 14' of the bead 14 is substantially radial, that is to say has an angle of inclination relative to the central axis of the tubular body substantially equal to 90 degrees. For reasons of cost and easy demolding of the body 3, the inclination of the inner surface 14 'of the bead 14 is here of 45 degrees, which is compatible with a standard fitting speed of the tube 2 in the channel 4 for the transmission of an audible signal when the blade 13 regains its original state.

In use, the strapping ring 19 is arranged at the inlet of the channel 4 and is perfectly visible from the outside of the connecting device 1. It is therefore possible at any time to visually control that the ring of strapping 19 is in the expected position, that is to say inside the channel 4 behind the bead 14 of the blade 13. It is also possible to use the strapping ring 19 to identify circuits using the connecting device 1, for example by producing rings of different colors matching the color of the body of the connection, or the color of the anticontamination seal 18, or a marking affixed in the vicinity of the connecting device ...

In case of failure or absence of the deadbeam 10, a fluid 24 flowing under pressure inside the tube 2 tends to pass through the retaining means 11 to exert an axial pressure on the anticontamination seal 18. In the case where the fluid pressure 2 4 is: greater than the friction forces due: in contact with the first and second asperities 18a, 18b with 1 / bore 9 of the third section 3c and the outer surface 8a of the end portion 8 of the tube 2, the anti-contamination seal 18; moves from the depressed position to a recessed position in which the anticontamination seal. 18 is in contact with the strapping ring 19 (Figure 5).

The anticontamination seal 18 then discovers part of the axial grooves 12 thus creating a leakage path 25 to allow the fluid 24 to escape. In the case of a braking circuit of a truck, the fluid 24 is pressurized air. The length and width of the axial grooves 12 are such that the passage of the fluid 24 through the leakage path 25 causes an audible signal such as a hissing sound. In this way, any leakage of the connection device 1. detectable without visually inspecting it. Even the search for a defective connection in a circuit is simplified since the audible signal makes it easy to locate the location of the defective connection or connections.

FIG. 6 illustrates a second embodiment of the invention relating more particularly to a connection device 101 of cartridge type intended to be implanted, as previously, in a fluid circuit for connecting a tube 102 to the rest of the circuit. of fluid.

The connecting device 101 comprises a tubular body 103 here made in two pieces 103a, 103b and delimiting a channel 104. The first piece 103a and the second piece 103b have an outer surface around and projecting radially ·· of which extend shoulders for retaining seals 116, 117.

In a similar manner to the first embodiment of the invention, the first piece 103a of the body 103 has an inlet opening of the channel 1.04 a deformable blade 113 having a bead 114 forming a witness, depressing, ..

The second.; room 103a is. shaped to receive a seal 110 '' and a clamp 111 for sealingly securing an end portion; 108 of the tube 102. in; the channel 104. The clamp 111 .is mounted axially movable ai. Includes an inner surface of asperities for biting an outer surface. 108a of the end portion 108: of the tuba 102. seal tin, anti-contamination of similar shape, according to the first embodiment is mounted mobile; in the first piece 103a of the body 103 and can move axi. alert between a depressed position in which the anticontamination seal 1X8 'has contact with an end of the second piece 103b, and a maximum position of: ·: withdrawal in which the anticontamination seal .118: · is .. in contact with the bead 114 of the laite 113.

A 1.15 sleeve is attached; coaxially at one end of the second piece,: 1, 0'3'b · forming a first inlet of the Body 10: 3 · and extends within the body 103 to · ·, one end of the first piece 103a forming a second inlet port of the body 103.

The. The sleeve 115 and the body 103 form a cartridge adapted to be sealed in a first bore 131 of an element 130 having a second bore 132 coaxial with the first bore 131 and extending the channel 104.

A strapping ring 119 is mounted on the tube 102 set back from the end portion 108 of the tube 102 by a distance. Predefined.

The operation of the connection device 1.01 is identical to that of the connecting device 1. The tube 102 provided with the strapping ring 119 is fitted on the sleeve 115 to introduce the end portion 108 of the tube 102 into the channel 104 until sound clipping of the strapping ring 119 by the blade 11: 3 ·. The end portion 108 of the tube 102 has then: passed through the clamp 101 and the seal 110, so that the fitting of the tube 102; in the channel 104: is sufficient for the end portion 108 of the tube 102 to be sealingly secured in the channel 104 of the body 103.

In. case of failure or. In the absence of the seal: 110, a fluid circulating under pressure inside the tube 102: tends to move the anti-contamination seal 118 which then passes from its depressed position to a revealing retrieval position. a portion of the axial grooves forming the blade 113 and forming a leak path which escapes the fluid.

FIG. 7 illustrates a third embodiment of the invention relating particularly to a connection device 301 intended to be implanted in a fluid circuit for connecting a tube 302 to the remainder of the fluid circuit.

The shape and composition of the connecting device 301 is similar to that of the connecting device 1 illustrating the first embodiment of the invention.

Thus, the device 301 comprises a tubular body 303 delimiting a channel 304 and receiving a sleeve 315, a seal 310 and retaining means 311 for sealingly securing an end portion 308 of the tube 302, a A seal 318 mounted at an inlet of the channel 404, a strapping ring 319 and a blade 3.13 equipped with a bead 314.

The retaining means 311 used in the device 301, however, are different from those used in: the connecting device 1. The retaining means 311 comprise, 0't'iment, a washer 3: 11a internally toothed which constitutes an alternative known to the gripping clip 11a illustrated in FIG. 1. It will therefore not be: detailed: more than that the operation of a, such washer 3: 11a ··, the. means of • Retention constituting, not in themselves the coe'ür of the Invention.

The difference between the matching device 1 and. the ΡΙ. s positive connection 301 resides .essential lemehi in the ·. In fact, the joint is now known to the nation 318: it is motionless and contained between the retaining means 311 and the ring. strapping 319.

As illustrated. in FIG. B, anti-contamination seal 3:18: comprises a first orifice 320 comprising two lips 320a, 320b which are deformable and deformable in; their state of. rest lay in the direction of one. first side wall · 318; a anticontent amination seal 318 to close1 substantially the orifice 320. In their deformed state, the; The lips 320a, 320b tend to move away from each other so that the orifice becomes open.

The seal, anticontamination 31: 8: also includes a second orifice 321 substantially identical and diametrically opposed to the first orifice 320. The orifice 321 thus comprises two elastically deformable lips 321a, 321b which in their rest lie axially in the direction of a second side wall 318 b of the anticontamination seal 318 for: sealing the orifice 321 in a similar manner. In the same way, the lips 321a, 321b tend, in their deformed state, to move away from each other so that the orifice becomes open, However, the lips 321a, 321b of the second orifice 321 are oriented in a direction opposite to the lips 320a, 320b of the first Orifice 320.

The first and second sidewalls 318a, 318b of the anti-contamination seal 318 comprise channels 322 extending radially face to face in pairs to create passages between an inner surface and an outer surface of the anticontamination seal 318. The channels 322 have substantially all the same shape and are symmetrically distributed around the central axis of the anticontamination seal 318. Two-way channels 322 open on the orifices 320, 321 for communicating the orifices 320, 321 with the inner surface and the outer surface 318. The operation of the faccording device 301 will now be detailed with reference to FIGS. 7 and 8. In a similar manner to the connection device 1, the strapping ring 319 is mounted on the tube 302 set back from the portion 308 end of the tube 302 of a predetermined distance D '' corresponding to the length of the end portion 308 of the tube 302 to be engaged in the device to ensure correct connection.

The tube 302 provided with the strapping ring 319 is then fitted onto the sleeve 315 to introduce the end portion 308 of the tube 302 into the channel 404 until the strapping ring 319 co-operates with the blade 313. emitting an audible signal.

In the event of failure or absence of the seal 310, a fluid 324 circulating under pressure inside the tube 302 tends to pass through the means of; Retention: 311 to exert an axial pressure on the anticontamination seal 318. Under the effect of the pressure, the lips 320a, 320b tend to deform so that the first Orifice 320 becomes open and then releases the fluid 3.2: 4 of the device 301 by the channels 322 of the first side wall 318a of the anticontamination seal.

In the case of a braking circuit of a truck, the fluid 324 is pressurized air. The lips 320a, 320b of the first orifice 320 are calibrated so that through the anticontamination seal 318, the pressure of the fluid 324 vibrates the lips 320a, 320b of the first port 320 which then emit an audible signal such as a hissing sound.

In the same way as for the connecting device 1, any sealing defect of the connecting device 301 is detectable without visually inspecting it. Similarly, the search for a faulty connection is simplified since the audible signal makes it easy to locate 1 / location of the defective connection or connections.

Advantageously, the operation of the device 3:01 remains unchanged when the anticontamination seal is mounted in the other direction as that illustrated in FIG. 7, the air then escaping through the second orifice 321 and the channels 322 of the second wall. lateral 318 b of the anticontamination seal 3.18. It is therefore not necessary for the user to pay attention to the direction of assembly of the seal, nor to add the presence of a keying for its mounting.

With regard to FIGS. 1 and 8, the tightness of the device depends greatly on the distance D, D ', D' 'predefined at which is set back the banding ring 18, 118, 318 on the end portion 8, 108, 308 of the tube 2, 102, 3: 02.-,

In order that the distance D, D ', D' 'predefined is easily achievable and repeatable, one. The tool 200 for setting up the strapping ring 19, 119, 319 on the end portion 8, 108, 308 of the tube 2, 102: 302 is illustrated in FIGS. 11 and 12. The tool 200 comprises a tubular body 201 defining a channel 202 intended to receive the end portion 8, 108, 308 of the tube 2, 102, 302. The tubular body 2Ό1 comprises an end 203 -without a hole inlet of the tube 2, 102, 302 in; the channel 202 and the opposite: a closed end 204 forming a stop at the depression of the end portion 8, 108, 308 of the tube 2, 102, 302. The inner diameter of the tubular body. 201 is substantially equal to the outer diameter: of the end portion 8, 108, 308: of the tube 2, 102, 302.

The tubular body 201 also comprises identical openings 206 of rectangular shape and symmetrically distributed around: the axis of the tubular body 2: Q! 1. The openings 208 are arranged in the vicinity of the end. 204 closed, the tubular body 201 so that it. .is. It is possible to visualize the contact between the end portion 8, 108, 3:08 of the tube 2, 102, 3..02 and the stop at. 1 'depression' formed by the end 204 closed: The tool: 2: 00: also comprises a flange 207 extending axially projecting from 1 / end: 203: of: tubular body: 201 and coaxially-to; 2. The inlet flange of the tube 2., 102 ·, 302 in the channel 20.2 The flange 207 has a notch 205 extending near the end 203 of the tubular body 201 in a plane perpendicular to the axis. of the flange and an axial tent extending from the middle of the notch 205 at one end of the flange opposite to: the end: 2: 03 '· of the body 20: 1 to form · ends thereof provided: each of an ear 208. The ears 208 are identical and comprise on an outer surface bosses 209 parallel to the l the axis of the tubular body 201 and intended to improve the grip of: the tool by the ears 208.

The flange 207 is elastically deformable between an open state in which the flange 207 is shaped to completely receive the strapping ring 19, 119, 319 in the open state and a closed state in which the ears 208 are sufficiently close to one of the another to bring the strapping ring 19, 119, 319 into its closed state. For this purpose, the flange is provided with a shoulder 210 forming a face 211 intended to serve as a support for the strapping ring 19, 119, 319 and passing the inside diameter of the flange 207 of a diameter substantially equal to outer diameter of the strapping ring 9, 119, 319 in the open state to a diameter substantially equal to the outer diameter of the tubular body 201. The distance separating the face 211 of the closed end 204 of the tubular body 201 is substantially equal to the predefined distance D, D '> D' '.

A first step of using: the tool consists of: .logging the strapping ring 19; .1,1: 9, 3,19 in state, open, at. 1 inside: 1.a collar 207 ·. It is advisable, then to put a tube. 2, 102, 302 through the "Ring Ring 19", 119, 319: until the end portion 8, 10: 8: 308 of the tube: 2., 1.0: 2 ·, 302 is in contact with the driving abutment formed by the closed end 204 of the tubular body 201, the openings allowing the operator to , to make sure that: • clest · the case well.

A pinch force: exerted on the ears 208 tends to. elastically deform the collar 207 which sees. inner diameter decrease. This reduction in diameter then leads in turn to a clamping force on the strapping ring 9, 119, 319 which, if it is sufficient, brings the strapping ring 9, 119, 319 in its closed state. The strapping ring 9, 119, 319 is thus mounted on the tube 2, 102, 302 set back from the end portion 8, 108, 308 of the tube 2, 102, 302 of the distance D, D 'predefined. The operator can then stop pinching the ears 208 of the flange 207 which then elastically returns to its Open state, then remove the tube 2, 102, 302 provided with the strapping ring 9, 119, 319 by a simple axial translation. the Tool 200 is very easy to use and it is also easy and inexpensive to make.

Of course, the invention is not limited to the embodiment described but encompasses any variant within the scope of the invention as defined by the claims.

The strapping ring 19, 119, 319 may be of different shape from that described as long as it tends to elastically deform the blade 13, 113, 313.

Although here only one blade 13 is illustrated, the number of blades 13, 113, 313 can be equal to or greater than two.

The shape and the number of toothing 20a, 20b of the strapping ring 19, 119, 319 may be different from those illustrated in FIG. 9.

The retaining means for securely securing: the. end portion 8, 108, 308 of the tube 2, 102: 302 in the connecting device may comprise elements different from; the forceps ·. 11, 111 illustrated · in Figures 1 and 6 and the washer ·· 311 illustrated in Figures 1 and 8, such as a split ring.

The number, shape and distribution of openings 206 may be different from those illustrated at. Figure 11.

The ears 208 tending to deform the flange 207 of the tool 200 may be of different shape from those illustrated in Figure 11. The closed end 204 of the tubular body 201 of the tool 200 may be partially open as long as it forms a stop at the depression of the tube 2, 102, 302 in the oUtil 200.

Although here the abutment to the depression of the tube 2, 102 in the tool 200 is arranged at the end of the tubular body 201, it can be shifted inwardly of the channel 202.

Claims (17)

1. Device for connecting a tube of a pressurized fluid circuit, the device comprising a tubular body delimiting a channel emerging on one end of the tubular body, the tubular body containing: a coupling member of a portion end of the tube in the channel, a sealing element of the connection of the tube with the tubular body, and - an anticontamination seal mounted at an inlet of the channel, characterized in that the anticontamination seal is arranged and shaped to allow, when a leakage of the connection, the fluid under pressure to escape the device by emitting an audible signal. 2 :, Connection device according to claim 1, wherein the anticontamination seal is mounted immovable: 'in the tubular body' and comprises, at least a · orifice provided with a flap portion to allow the .fluide ·. under pressure to cross appreciably. the seal, .an are a friend of the nation,. .3. Connection device: according to, 1a. 2, in which the orifice has elastically deformable edges between a rest state in which the orifice is closed and a deformed state in which the orifice is open. 4. Connection device. according to claim 3, wherein the edges comprise two lips which in their rest state are pressed against each other by extending axially towards the inlet of the channel. 5. Connection device according to claim 4, comprising two orifices, namely a first orifice and a second orifice, the lips of the second orifice being oriented in a direction opposite to the lips of the first orifice, The connecting device according to claim 1, wherein the anticontamination seal is movably mounted in the tubular body and the end of the tubular body comprises apertures, the anticontamination seal moving along the tube from a recessed position in the tubular body. wherein the anti-amination seal prevents intrusion of contaminant into the interior of the tubular body at a recessed position in which the anticontamination seal uncovers at least a portion of the openings: to release the pressurized fluid. 7; ... connection device according to any one of the preceding claims, wherein 1'extrémité the tubular body comprises a sunken witness. po.rt.ipn ,. end of the tube -in the channel, the device comprising a strapping ring intended to be mounted on an end portion of the tube at a distance such that the driving indicator cooperates with the strapping ring only when the tube is sufficiently engaged in the channel for the end portion of the tube cooperates with the fastening member. 8. Connecting device according to claim 7, wherein the driving indicator is arranged to emit an audible signal when it cooperates with the strapping ring. 9. Connecting device according to claim 8, wherein the driving indicator comprises at least one elastically deformable blade having an end secured to the tubular body. 10. Connecting device according to claim 9, wherein the blade is defined in the tubular body by two axial grooves opening .. 11. Connecting device according to claim 10, wherein the axial grooves Constitute openings. 12. Connecting device according to any one of claims 7 to 11, wherein there ring collar has on its inner surface at least one hooking asperity arranged to bite the outer surface of the tube and form: an axial connection means from the strapping ring to the tube. 13, A CONNECTION DEVICE according to claim 12, wherein the strapping ring is shaped to be removable. 14, connecting device according to claim 13, wherein the strapping ring comprises an open state in which the strapping ring is free to slide along the tube, and a closed state in which the inner surface of the strapping ring bites the outer surface of the tube to immobilize axially the strapping ring on the tube: 1.5 ···. Connecting device according to the claim. 14, in which the strapping ring is split, the ends of the ring being strapped, shaped to engage with each other when the ring is in a closed state. 16. Connection device according to claim 15, wherein the ends of the ring comprise .au. "minus a toothing. 17. Device d. connection according to any one of the claims. 1.2 to. .1: 6., In ·, which, the strapping ring is visible from outside the device in .service. 18. .Dispositif de · connection according ..the claim: .1.7, wherein the banding ring .is. arranged at the entrance to the canal. 19. A tool for setting a strapping ring on an end portion of a tube, the strapping ring having an open state in which the strapping ring is free to slide along the tube and a closed state in which the inner surface of the ring bites the outer surface of the tube to axially immobilize the strapping ring on the tube, the tool comprising: - a tubular body delimiting a channel for receiving an end portion of the tube, the body having a stop at the recess of the end portion of the tube in the channel and at the opposite end an end provided with an inlet of the tube in the channel, - a collar extending in axial projection from the end coaxially with the inlet orifice, the collar having an axial slot forming two ends each provided with an ear and being elastically deformable between an open state in which the collar is shaped: for example a ring ring in an open state and a closed state in which the ears are brought together to bring the ring into the closed position of the ring; 20. tool according to .lâ. Claim 19, wherein the tubular body comprises viewing regions for viewing the contact of the end portion of the tube with. the stop: · at the depression. 2: 1. Tool · according to the. ..te.vehdicati.qrL 20, wherein ... the .zones. visualizations are. · openings. 22. Method of connecting a tube to the. means: a "device" comprising a tubular body delimiting a channel, opening on an end; · the tubular body • which comprises a witness of depression of an end portion of the tube in the channel, the method comprising the following steps: - placing a ring, strapping on, the tube so that the strapping ring is withdrawn from a predefined distance from the end portion. of the tube> introduction of the end portion of the tube; in the channel until the driving indicator cooperates with the strapping ring., .., 2: 3, Method: according to claim 22, wherein the. Strapping ring has an outermost state. In which, the strapping ring is free to slide along the tube and a closed state in which the ring is closed. strapping is iffirtôbillsée axially sut the; tube, the method comprising: the steps of: threading the strapping ring open on the tube so that the strapping ring is set back from the predefined distance, the end portion of the tube; the ring ring of the open state to the closed state. 24. The method of claim 22, wherein an adhesive seal of the same color as the strapping ring is mounted in the tubular body at the inlet port.