WO2020058818A1 - Quick plug-in fitting with integrated extractor device - Google Patents

Quick plug-in fitting with integrated extractor device Download PDF

Info

Publication number
WO2020058818A1
WO2020058818A1 PCT/IB2019/057765 IB2019057765W WO2020058818A1 WO 2020058818 A1 WO2020058818 A1 WO 2020058818A1 IB 2019057765 W IB2019057765 W IB 2019057765W WO 2020058818 A1 WO2020058818 A1 WO 2020058818A1
Authority
WO
WIPO (PCT)
Prior art keywords
fitting
axis
along
sealing
clamping element
Prior art date
Application number
PCT/IB2019/057765
Other languages
French (fr)
Inventor
Andrea TOSI
Cristian BREA
Original Assignee
Tosi F.Lli S.R.L.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Tosi F.Lli S.R.L. filed Critical Tosi F.Lli S.R.L.
Publication of WO2020058818A1 publication Critical patent/WO2020058818A1/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/092—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector
    • F16L37/0925—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of elements wedged between the pipe and the frusto-conical surface of the body of the connector with rings which bite into the wall of the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/091—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring provided with teeth or fingers
    • F16L37/0915—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of a ring provided with teeth or fingers with a separate member for releasing the coupling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L37/00—Couplings of the quick-acting type
    • F16L37/08—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members
    • F16L37/084—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking
    • F16L37/098—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks
    • F16L37/0982—Couplings of the quick-acting type in which the connection between abutting or axially overlapping ends is maintained by locking members combined with automatic locking by means of flexible hooks with a separate member for releasing the coupling

Definitions

  • the present invention relates, in general, to a quick plug-in fitting adapted for use in fluid conduction systems, such as, for example, compressed-air pneumatic circuits, particularly pneumatic systems for braking systems of vehicles, e.g. trucks, tractors, buses, trailer- trucks, etc.
  • fluid conduction systems such as, for example, compressed-air pneumatic circuits, particularly pneumatic systems for braking systems of vehicles, e.g. trucks, tractors, buses, trailer- trucks, etc.
  • Fittings which comprise a body, within which at least one sealing element, a conduction element and a clamping element are appropriately positioned, which are held in position by means of a locking device.
  • the design specifications dictated by the customers, require that the extractor device be integrated into the fitting.
  • the integration of such an extractor device requires that the fitting be designed in such a way that the extractor device can be activated by an operator easily enough, that it will not be subject to unintentional activation, and that it will maintain the degree of axial sealing of the connection.
  • the present invention aims at solving the above- mentioned technical problems and many other problems by providing a fitting wherein the extractor device performs exclusively the extractor function, while the locking device is suitably shaped to integrate said extractor device without impairing the axial sealing of the fitting.
  • the present invention allows using simple clamping elements, thus reducing the risk of malfunctioning of the fitting.
  • One aspect of the present invention relates to a fitting having the features set out in the appended claim
  • a further aspect of the present invention relates to a pneumatic circuit having the features set out in the appended claim 10.
  • Figure 1 shows, in an exploded perspective view, one possible embodiment of a plug-in fitting according to the present invention
  • Figures 2A and 2B show different exploded plan views of the fitting of Figure 1, in particular: Figure 2A shows a first exploded plan view of the fitting; Figure 2B shows a second exploded plan view of the fitting, turned by 90° about the longitudinal axis of the fitting, compared with the view of Figure 2A;
  • Figure 3 shows a partially sectional side view of the fitting of Figure 1 in the assembled condition
  • Figures 4A and 4B show the fitting of Figure 3 coupled to a tube or pipe, in the different operating configurations of the fitting; in particular, Figure 4A shows the fitting in a partially sectional side view, with the extractor device deactivated; Figure 5B shows the fitting with the extractor device activated; • Figure 5 shows a detail of Figure 4B, wherein one can see the action exerted by the release element of the extractor device on the clamping element;
  • Figures 6A and 6B show different details, at least partly sectioned, of the fitting according to the present invention, with respect to a section plane perpendicular to the section plane of Figure 3; in particular, Figure 6A shows the plug-in fitting of Figure 1 in the assembled condition; Figure 6B shows a detail of the fitting , wherein one can see the interaction between the first element and the second element of the locking device, with respect to the sealing portion of the cavity of the body of the fitting according to the present invention;
  • Figure 7 shows a perspective view of a pneumatic circuit comprising fittings according to the present invention .
  • reference numeral 2 designates as a whole a plug-in fitting according to the present invention.
  • Reference numeral 1 designates as a whole a pneumatic circuit, in particular pneumatic circuits for compressed-air braking systems for vehicles, comprising a plurality of tubes or pipes "C".
  • Quick plug-in fitting 2 is particularly suitable for joining together tubes or pipes "C" comprised in pneumatic circuits 1.
  • Fitting 2 comprises a body 3 having a substantially cylindrical shape and defining a through cavity 30 extending at least partly along an axis "A".
  • the following parts are appropriately positioned: at least one sealing element "T"; at least one clamping element 5; at least one locking device 6 and at least one extractor device 7.
  • a conduction element 4 is also appropriately positioned in said cavity 30.
  • said at least one sealing element "T” is arranged, preferably in co-operation with said conduction element 4, in such a way as to seal the inner surface of said cavity 30 of body 3 from an inner surface of a tube or pipe "C” inserted in said body 3 along a assembly direction "F", preferably parallel to said axis "A".
  • Said clamping element 5 is configured in such a way as to engage with an outer surface of said tube or pipe "C".
  • Said locking device 6 is at least adapted to limit a movement of said clamping element (5), at least along said axis "A" of said clamping element 5, preferably movements along assembly direction "F", more preferably a movement in the direction opposite to assembly direction "F".
  • Said extractor device 7 is adapted to move along said axis "A Said extractor device 7 in turn comprises: an activation portion 70, adapted to allow the activation of extractor device 7; and a release element 73.
  • said extractor device 7 comprises also a tubular portion 71.
  • said activation portion 70 is arranged at one end of tubular portion 71; while said release element 73 is arranged at the opposite end of tubular portion 71.
  • Said release element 73 is adapted to interact with said clamping element 5 so as to vary the engagement action exerted on tube or pipe "C” by said clamping element 5 as a function of the action exerted on said activation portion 70, and in particular of the movement of extractor device 7 along said axis "A" .
  • said release element 73 is adapted to reduce the engagement action exerted on tube or pipe "C” by said clamping element 5.
  • said locking device 6 comprises: a first element 62 and a second element 64, preferably distinct from each other and therefore not forming a monolithic element.
  • Said first element 62 is adapted to limit the movement of said clamping element 5 along said axis "A".
  • said first element 62 is also adapted to guide, at least partly, said extractor device 7 in its movement along said axis “A”.
  • Said second element 64 is adapted to connect, through a snap action, to a sealing portion 31 comprised in cavity 30 of body 3.
  • Said second element 64 is so shaped as to limit at least a movement of said first element 62 of locking device 6 at least along said axis "A".
  • Said second element 64 is so shaped as to limit at least a movement of said extractor device 7 at least along said axis "A".
  • fitting 2 makes it possible to selectively disconnect a tube or pipe "C" from fitting 2.
  • the solution according to the present invention integrates extractor device 7, thereby improving the resistance of fitting 2 to pulling forces exerted along said axis "A", e.g. exerted on the tube or pipe connected to the fitting.
  • said extractor device 7 is relieved from any direct function of resisting pulling forces applied along said axis "A".
  • the present invention thus allows solving the technical problems suffered by the prior art .
  • the present solution does not require any special instruments and/or tools adapted to interact with said clamping element 5, in order to vary the engagement action exerted on tube or pipe "C" by said clamping element
  • the present solution makes it possible to simplify the structure of clamping element 5, facilitating the intentional activation of extractor device 7.
  • said body 3 may change as required.
  • said body 3 may have an elbow shape, a "T” shape, a "Y” shape, or a simple tubular shape .
  • said body 3 may comprise a control portion 33 that allows orienting body 3.
  • Said control portion 33 may be formed in body 3 as a monolithic piece or may be sealingly coupled to body 3.
  • Said control portion 33 may be an increased outside diameter of body 3 adapted to co operate with a tool, e.g. a spanner, preferably an open spanner, being preferably hexagonal in shape.
  • said body 3 may have a tubular shape, thus implementing a union device, e.g. comprising two conduction elements 4, two clamping elements 5, two locking devices 6 and two extractor devices 7 arranged at both ends of body 3.
  • a union device e.g. comprising two conduction elements 4, two clamping elements 5, two locking devices 6 and two extractor devices 7 arranged at both ends of body 3.
  • at least one sealing portion 31 is formed in cavity 30 of body 3, preferably as an undercut, with respect to a assembly direction "F", preferably a groove, more preferably a step like diameter discontinuity.
  • At least said second element 64 is adapted to interact with said sealing portion 31 of body 3 for the purpose of preventing the extraction of the components and devices arranged in cavity 30 of body 3 when a pulling force is exerted along said axis "A", preferably in the direction opposite to assembly direction "F".
  • fitting 2 in fitting 2 according to the present invention the number of sealing elements "T” may vary as a function of specific needs and of the required degree of tightness.
  • some embodiments of fitting 2 also comprise further sealing elements "T” in addition to sealing element "T” positioned in cavity (30) of body 3, depending on the conformation of body 3, e.g. in proximity to threaded connection portions, as shown by way of example in Figures 3, 4A, 4B and 6A.
  • said second element 64 comprises a hollow body 640, e.g. annular in shape. From said body 640, at least one pair of fins 642 extend. Preferably, said fins extend substantially along axis "A".
  • Each fin 642 is adapted to connect, through a snap action, to sealing portion 31 comprised in cavity 30 of body 3. Such fins 642 therefore limit the movement of said first element 62, and hence of said clamping element 5, along said axis "A".
  • said pair of fins 642 is arranged along the perimeter of said body 640, so that said fins 642 are in diametrically opposite positions.
  • said fins 642, in particular at least a tract thereof, are preferably inclined relative to said axis "A", e.g. inclined radially towards body 640.
  • each fin 642, or at least a portion thereof, is inclined radially by an angle of 3° to 10°, e.g. approx. 5°.
  • each fin 642, or at least a part thereof, is elastically deformable.
  • said first element 62 comprises an annular base 620. From said base 620, at least one pair of sealing protrusions 622 extend. Preferably, said sealing protrusions extend along said axis "A".
  • Each sealing protrusion 622 is adapted to connect, e.g. through a snap action, preferably by shape coupling, to a sealing portion 31 comprised in cavity 30 of body 3, e.g. the same sealing portion 31 to which said second element 64 connects.
  • a sealing portion 31 comprised in cavity 30 of body 3, e.g. the same sealing portion 31 to which said second element 64 connects.
  • This connection preferably obtained by shape coupling, is such as to prevent any movement of the first element 62 along said axis "A".
  • said pair of sealing protrusions 622 are arranged along the perimeter of said base 620, more preferably in such a way that said sealing protrusions 622 are in diametrically opposite positions.
  • sealing protrusions 622 are aligned along an axis perpendicular to the axis along which said fins 642 are arranged.
  • fitting 2 is configured in such a way that said body 640 of the second element 64 comprises an external surface, which in turn is shaped in such a way as to exert a force along an axis transversal with respect to said axis "A" on said sealing protrusions 622 of the first element 62, so as to move them away from each other.
  • Such transversal force applied to sealing protrusions 622 by body 640 results from a pulling force exerted on the second element 64 along said axis "A".
  • the present embodiment of fitting 2 provides a further safety system preventing the elements positioned in cavity 30 of body 3 from coming out under a pulling force exerted at least along said axis "A".
  • the co-operation between the first element 62, particularly said sealing protrusions 622, and the second element 64 generates a wedge-shaped system that increases the safety and reliability of fitting 2 according to the present invention.
  • said sealing protrusions 622 will be pushed into sealing portion 31 of cavity 30, in particular by said body 640 of the second element 64.
  • Said sealing protrusions 622 as they penetrate into sealing portion 31, thus generating a shape coupling, will act as a wedge because they will remain spread apart. In this condition, the safety of fitting 2 is improved, since the components are prevented from coming out of body 3 of fitting 2.
  • a preferred embodiment of the second element 64 of locking device 6 comprises an abutment portion 641.
  • Said abutment portion 641 is comprised in body 640 of the second element 64.
  • said abutment portion 641 is located in the inner perimeter of said annular body 640 of the second element 64.
  • tubular portion 71 of extractor device 7 comprises a discontinuity 712.
  • Such discontinuity 712 is adapted to abut against said abutment portion 641 comprised in body 640 of the second element 64 of locking device 6.
  • Said discontinuity 712 is a protrusion protruding radially from the outer surface of tubular portion 71, preferably extending circumferentially around the outer perimeter of tubular portion 71.
  • said discontinuity 712 is a plurality of indentations arranged along the circumferential perimeter of said tubular portion 71.
  • said discontinuity 712 is at least partly sawtooth-shaped.
  • said discontinuity is located in a central region of tubular portion 71.
  • Such discontinuity 712 contributes to defining the travel of extractor device 7 along said axis "A".
  • Said activation portion 70 has an annular shape, with an outside diameter greater than the outside diameter of tubular portion 71.
  • the outside diameter of said activation portion is equal to or greater than the diameter of cavity 30 of body 3.
  • the diameter of said tubular portion 71 is such that it can go through both said annular body 640 of the second element 64 and said annular base 620 of the first element 62.
  • Said release element 73 preferably a tapered portion of the end of tubular portion 71 that reduces the outside diameter thereof, is so shaped as to come between the outer walls of tube or pipe "C” and said clamping element 5, so that it allows changing the interaction between clamping element 5 and tube or pipe “C” as a function of the movement made by extractor device 7 along said axis "A".
  • the reduction in the outside diameter of tubular portion 71 permits release element 73 to come between the outer walls of tube or pipe "C" and said clamping element 5.
  • said release element 73 is adapted to increase the diameter of said clamping element 5, thereby reducing its action upon said tube or pipe "C".
  • the action of release element 73 due, for example, to its conformation is such as to prevent clamping element 5 from moving along said axis "A" when said abutment element 73 is interacting with clamping element 5, thus avoiding that the outer surface of clamping element 5 might abut on the tapered portion of annular base 620 of the first element 62, which would prevent its diameter from changing.
  • said extractor device 7 is adapted to take two operating configurations: an active configuration, in which it reduces the interaction between clamping element 5 and tube or pipe "C" inserted in fitting 2, thus allowing the same tube or pipe “C” to be removed from fitting 2; and an inactive operating configuration, in which it does not affect the interaction between clamping element 5 and tube or pipe "C".
  • the switching of extractor device 7 from the inactive operating configuration to the active operating configuration can be achieved by exerting a force on activation portion 70 along said axis "A" in assembly direction "F".
  • a force may be applied either manually or through the use of a tool, e.g. pliers.
  • the switching of extractor device 7 from the active operating configuration to the inactive operating configuration can be achieved by exerting a force on activation portion 70 along said axis "A" in the direction opposite to assembly direction "F".
  • a force may be applied either manually or through the use of a tool, e.g. pliers.
  • fitting 2 is so designed that, when a tube or pipe "C” is inserted into fitting 2, the insertion of tube or pipe “C” will cause the deactivation of extractor device 7, resulting in extractor device 7 sliding along said axis "A" in the direction opposite to assembly direction "F".
  • said extractor device 7 and said locking device 6 are suitably shaped in such a way that, when said extractor device 7 is in the inactive configuration, said discontinuity 712 abuts against abutment portion 641 comprised in body 640 of the second element 64 of locking device 6.
  • said extractor device 7 and said locking device 6 are suitably shaped in such a way that, when said extractor device 7 is in the active configuration, said discontinuity 712 abuts against said annular base 620 of the first element 62 of locking device 6.
  • said abutment portion 641 of the second element 64 and said annular base 620 of the first element 62 of locking device 6 define the end-of-travel points for the movement of extractor device 7 along said axis "A" when switching between the different operating configurations, particularly by interacting with said discontinuity 712 comprised in tubular portion 71. Therefore, the distance between said abutment portion 641 of the second element 64 and said annular base 620 of the first element 62 defines the travel that extractor device 7 is allowed to cover along said axis "A".
  • said extractor device 7 and said locking device 6 are also suitably shaped in such a way that, when said extractor device 7 is in the active configuration, the activation portion 70 abuts, at least partly, on said second element 64, preferably against a face of said body 640.
  • said second element 64 comprises a body 640, which comprises a first base from which said abutment portion 641 extends.
  • each fin 642 comprises a first tract, extending parallel to said axis "A" and having first elastic properties, and a second tract, at least partly inclined relative to said axis "A” and having second elastic properties.
  • Said second tract of the fins preferably has greater elastic properties than the first tract, which is more rigid.
  • said first tract extends from said body 640 of the second element 64, along said axis "A", whereas said second tract starts from the distal end of said first tract, arranging itself in such a way as to approach said body 640 again.
  • each fin 642 extends from the base of said body 640, which is proximal to the first element 62 of the locking device, when fitting 2 has been appropriately assembled.
  • each sealing protrusion 622 protrudes from said annular base 620 of the first element 62 at the portion thereof which is proximal to the second element 64 of the locking device, when fitting 2 has been appropriately assembled .
  • the conformation of said fins 642 and said sealing protrusions 622 is such as to define a shape coupling, when said first element 62 and said second element 64 of locking device 6 are assembled in fitting 2 according to the present invention.
  • the gap left by two sealing protrusions 622 along the perimeter of said annular base 620 is such as to receive a fin 642
  • the gap left by two fins 642 along the perimeter of said body 640 is such as to receive a sealing protrusion 622.
  • sealing protrusions 622 and fins 642 are so designed that all of them, when locking device 6 has been assembled in fitting 2, can abut on a sealing portion 31 of body 3 of fitting 2, more preferably on the same sealing portion 31 comprised in cavity 30 of body 3.
  • the conformation of said sealing portion 31, said sealing protrusion 622 and/or said fins 642 is such as to prevent the rotation of said first element 62 and said second element 64 about said axis "A".
  • said clamping element 5 has an incomplete annular shape and is monolithic. In such an embodiment, a single component constitutes clamping element 5.
  • clamping element 5 is adapted to be elastically deformed.
  • Said clamping element 5 is preferably made of metallic material.
  • clamping element 5 comprises an inner perimeter 52 adapted to abut against a tube or pipe "C" in order to retain it in fitting 2.
  • said inner perimeter 52 is continuous, having no notches or interspaces increasing its elastic properties. Therefore, clamping element 5 is easy to manufacture .
  • said clamping element 5 externally defines a conical structure.
  • said clamping element 5 is so arranged that the minor base of the conical structure faces towards the first element 62 of the locking device, abutting against a face of annular base 620 of the first element 62 when said clamping element 5 is appropriately assembled in fitting 2 according to the present invention.
  • Said inner profile 52 is suitably tapered to optimize the interaction action exerted on tube or pipe "C" by clamping element 5.
  • the shape of said inner profile 52 of clamping element 5 is illustrated in detail, for example, in Figure 5.
  • fitting 2 according to the present invention comprises a single monolithic clamping element 5.
  • said sealing element "T” is preferably a gasket, e.g. an 0-ring.
  • said conduction element 4 comprises a tubular portion 41 adapted to penetrate into tube or pipe "C", abutting on the inner walls of the same tube or pipe "C”; and a trough-shaped portion 42 adapted to abut against the edges or lips of tube or pipe "C” inserted in fitting 2.
  • Said trough-shaped portion 42 is adapted to define a seat through which, in co-operation with sealing element "T", it is possible to ensure tightness with the cavity of said body 3 of fitting 2.
  • Fitting 2 according to the present invention is particularly suitable for use in pneumatic circuits 1.
  • Pneumatic circuit 1 is particularly suitable for use in compressed-air braking systems for vehicles.
  • said pneumatic circuit 1 comprises a plurality of tubes or pipes "C".
  • said pneumatic circuit 1 comprises at least one first section 11 and at least one second section 12. Said at least one first section 11 is connected to at least one second section 12 by means of a fitting 2 according to the present invention.
  • Figure 7 shows, by way of non-limiting example, a pneumatic circuit 1 comprising one or more fittings 2 according to the present invention. In particular, it shows two fittings 2 in an assembled configuration, in particular an adjustable axial fitting 2 and an elbow fitting.
  • first sections 11 and/or second sections 12 of pneumatic circuit 1 are suitably connected to the ends of each fitting 2.
  • Said first section 11 may have structural characteristics, e.g. dimensions, materials, etc., that are different from those of the second section 12.
  • Said fitting 2 is thus adapted to connect two or more sections of a pneumatic circuit 1.
  • Said pneumatic circuit 1 may internally comprise one or more valves, one or more sensors and one or more tanks as a function of the characteristics and functionalities of pneumatic circuit 1 that needs to be implemented.
  • said fitting 2 is capable of connecting said first section 11 and/or said second section 12 to one or more valves, one or more sensors and/or one or more tanks.
  • Figure 1 shows, in an exploded perspective view, one possible embodiment of a plug-in fitting 2 according to the present invention .
  • Figure 1 shows the parts and components of the fitting along axis "A" in assembly direction "F".
  • body 3 comprises a cavity 30 adapted to house, with reference to assembly direction "F", said conduction element 4, a sealing element “T”, particularly an 0-ring, a clamping element 5 and a locking device 6, in turn comprising a first element 62 and a second element 64.
  • fitting 2 according to the present invention comprises an extractor device 7, in turn comprising an activation portion 70, a tubular portion 71 and a release element 73.
  • said first element 62 and said second element 64 are distinct and independent and have complementary shapes, so that they will mate together when assembled in fitting 2.
  • Figure 2A shows an exploded plan view of fitting 2.
  • said body 3 comprises a control portion 33 having a regular shape, in particular a hexagonal shape, so that it can co-operate with a tool, e.g. a spanner, in particular an open spanner.
  • a tool e.g. a spanner, in particular an open spanner.
  • Cavity 30 of body 3 houses the elements of fitting 2, in particular a conduction element 4, which comprises a tubular portion 41 and a trough-shaped portion 42. Said conduction element 4 is adapted to co-operate with a sealing element "T”, implemented as an 0-ring, to ensure the necessary tightness of fitting 2.
  • a conduction element 4 which comprises a tubular portion 41 and a trough-shaped portion 42.
  • Said conduction element 4 is adapted to co-operate with a sealing element "T”, implemented as an 0-ring, to ensure the necessary tightness of fitting 2.
  • clamping element 5 having a truncated conical shape.
  • Said cavity 30 also houses locking device 6, in turn comprising a first element 62 and a second element 64.
  • Said first element 62 is distinct from and independent of said second element 64.
  • Said first element 62 which comprises an annular base 620, is visible in Figure 2A.
  • Figure 2A also shows said second element 64, which comprises a body 640 and a pair of fins 642 extending from said body 640 along said axis "A".
  • extractor device 7 On top of locking device 6 there is extractor device 7.
  • extractor device 7 comprises: an activation portion 70; a tubular portion 71, in turn comprising a discontinuity 712; and a release element 73.
  • Figure 2B shows a second exploded plan view of fitting 2, turned by 90° about said axis "A" compared to the view of Figure 2A.
  • Figure 2B better illustrates the conformation of control portion 33 of body 3.
  • Figure 2B makes it possible to understand further construction details of locking device 6, in particular of the first element 62 and second element 64.
  • Figure 2B shows further construction details of the first element 62, which comprises sealing protrusions 622 extending from annular base 620.
  • Figure 2B also makes it possible to understand the conformation of body 640 of the second element 64.
  • Figure 2B shows that there is a shape coupling between the first element 62 and the second element 64.
  • extractor device 7 is arranged on top of locking device 6, extractor device 7 is arranged.
  • Figure 3 shows a partially sectional side view of the plug-in fitting of Figure 1 in the assembled condition.
  • the figure shows one possible arrangement of the various parts comprised in fitting 2 within cavity 30 of body 3.
  • fitting 2 comprises a conduction element, which comprises a tubular portion 41 and a trough-shaped portion 42.
  • Said sealing element "T” co-operates with the conduction element to seal the inner surface of said cavity 30 of the body 3.
  • clamping element 5 is visible, which has a truncated conical shape.
  • the shape of said clamping element is such that it can act upon a tube or pipe and retain it within fitting 2.
  • Figure 3 shows how said first element 62 of locking device 6 is arranged within cavity 30 of body 3. The figure also makes it possible to understand how said first element 62 permits holding said clamping element 5 in position, preventing it from moving along said axis "A".
  • annular base 620 of the first element 62 preferably acts as a guide for extractor device 7 in its movement along said axis "A".
  • Said second element 64 is adapted to arrange itself appropriately with respect to the first element 62.
  • a part of said fins 642 of the second element 64 is adapted to abut against annular base 620 of the first element 62.
  • a fin 642 is visible, which is adapted to abut against sealing portion 31, in particular a housing, formed in the walls of cavity 30 of body 3.
  • Figure 3 shows the extractor device in an inactive configuration, in which it does not affect the engagement action exerted by said clamping element 5 on a tube or pipe "C" inserted in fitting 2. In fact, said extractor device 7 does not interact with said clamping element 5.
  • Figure 3 also shows that the radial dimension of activation portion 70 is greater than or equal to the one defined by the aperture of cavity 30 of body 3.
  • Figure 3 additionally shows a second sealing element "T" placed under said control portion 33 of body 3.
  • Figure 4A shows plug-in fitting 2 of Figure 3 coupled to a tube or pipe "C", wherein extractor device 7 is inactive .
  • the embodiment illustrated in the drawing shows the positioning of tube or pipe “C” relative to the various elements of fitting 2.
  • tubular portion 41 of the conduction element is inserted in tube or pipe "C”.
  • trough-shaped portion 42 is adapted to receive the end of tube or pipe "C”, thus ensuring tightness through sealing element "T”.
  • the same clamping element 5 is held in position by the first element 62 of the locking device.
  • the shape of base 620 is such as to hold in position said clamping element 5, preventing it from moving along said axis "A". If an extraction force is applied to clamping element 5 along said axis "A" in the direction opposite to assembly direction "F", the conformation of annular base 620 is such as to increase the clamping action exerted by clamping element 5 on tube or pipe "C", thus reducing the possibility of extraction of tube or pipe "C” from fitting 2.
  • a fin 642 is visible, which interacts with sealing portion 31 formed in cavity 30 of body 3.
  • the interaction between said fin 642 and said sealing portion is such as to prevent the unintentional extraction of locking device 6 from body 3 of fitting 2.
  • Figure 4B shows plug-in fitting 2 of Figure 3 coupled to a tube or pipe "C", wherein extractor device 7 is in the active condition.
  • Figure 4B shows the positioning of pipe or duct "C" with respect to the various elements of fitting 2 when extractor device 7 is in the active condition, particularly in comparison with Figure 4A.
  • extractor device 7 is active, and the same extractor device 7 has been moved along axis "A" in assembly direction "F".
  • said discontinuity 712 is no longer in abutment with abutment portion 641 comprised in body 640 of the second element 64, but abuts against annular base 620 of the first element 62.
  • activation portion 70 is in abutment with body 640 of the second element 64.
  • release element 73 interacts with clamping element 5, in particular keeping it apart from tube or pipe "C".
  • extractor device 7 causes no variation in the interaction between fin 642 and sealing portion 31 formed in cavity 30 of body 3. Therefore, it will be possible to extract tube or pipe "C" without the risk that some of the elements of fitting 2 might be unintentionally extracted from body 3 of fitting 2.
  • Figure 5 shows a detail of Figure 4B, wherein one can see the action exerted on clamping element 5 by release element 73 of extractor device 7.
  • release element 73 prevents clamping element 5, and particularly inner perimeter 52 thereof, from acting against the outer surface of said tube or pipe "C".
  • extractor device 7, and in particular release element 73 is such as to vary the diameter of clamping element 5, thereby varying also the possible interaction between the same clamping element 5, in particular inner perimeter 52 thereof, and the outer surface of tube or pipe "C".
  • release element 73 positions itself between the outer surface of tube or pipe "C” and inner perimeter 52 of clamping element 5.
  • Figure 5 also shows how said first element 62 and said second element 64 position themselves with respect to each other .
  • Figure 5 also shows one possible embodiment of the fitting, wherein tightness is ensured by means of a sealing element "T" in the form of an 0-ring.
  • Figure 6A shows a partial sectional view of the plug in fitting of Figure 1 in the assembled condition, wherein the section refers to a plane perpendicular or rotated by 90° relative to the section plane of Figure 3.
  • FIG. 6A shows the extractor device 7 in the inactive condition.
  • discontinuity 712 is in abutment with abutment portion 641 comprised in body 640 of the second element 64.
  • extractor device 7 is inactive, and therefore activation portion 70 is distant from body 640 of the second element 64.
  • Figure 6A clearly shows the interaction between said sealing protrusion 622 and sealing portion 31 of cavity 30 of body 3.
  • Figure 6B shows a detail of the fitting, in which one can see the mutual interaction between the first element 62 and the second element 64 of locking device 6, as well as the interaction of the same with respect to sealing portion 31 of cavity 30 of body 3 of fitting 2 according to the present invention.
  • Figure 6B shows that sealing protrusion 622 is so designed as to interact, by generating a shape coupling, with sealing portion 31. Also fins 642 comprised in the second element 64, not visible in Figure 6B, interact with the same sealing portion 31, as can be easily understood from the other figures, e.g. Figure 3.
  • Quick plug-in fitting 2 according to the present invention is particularly suitable for use with tubes or pipes "C" made of polyamide 11/12, or polyamide 10/12, polyamide 12, or elastomeric polyester.
  • Fitting 2 according to the present invention is adapted to comply with the following specifications: DIN 74324, DIN 73378, ISO 7628 and SAE J2494-3.
  • Fitting 2 according to the present invention, and in particular said body 3, can be manufactured by using different copper alloys, including:
  • fitting 2 according to the present invention and in particular locking device 6 and extractor device 7, can be manufactured by using different semi finished products of polyamide, including: PA 66 GF30; PA 6.10 GF30, PA 12 GF 30, PA 12 GF50, PA 6.12 GF30 and PA 6.12 GF50.
  • fitting 2 according to the present invention can be made of rubber, including EPDM, NBR and HNBR.
  • the thermal operating range of fitting 2 is preferably comprised between +100°C and -40°C.
  • the maximum operating pressure is, for example, approximately, preferably equal to, 15bar.
  • Fitting 2 according to the present invention makes it possible to eliminate the use of external extractor devices, since extractor device 7 is already integrated into fitting 2.
  • the present solution allows reducing the number of parts to be purchased, eliminating the risk of not being able to remove tube or pipe "C" because the specific extractor device is unavailable.
  • Fitting 2 according to the present invention makes it possible to increase the flexibility of use of the fitting, since it can also be applied in challenging environments, e.g. difficult to reach due to obstacles and/or insufficient room.
  • Fitting 2 permits manufacturing the standard components of a fitting in the same way as the solutions currently known in the art, so that the production costs of the fitting are reduced; for example, said body 3 can be easily made from brass.
  • Fitting 2 according to the present invention since it has a reduced number of parts, is easy to assemble.
  • Fitting 2 ensures a high degree of reliability, while facilitating the intentional extraction of tube or pipe "C" from fitting 2.
  • Fitting 2 according to the present invention does not require the use of springs or elastic elements for changing the engagement action exerted by clamping element 5 on the outer surface of said tube or pipe "C". Therefore, fitting 2 allows the use of clamping elements 5 having a simple shape, with no fins or snap-action elements, which can be easily manufactured and are less subject to malfunctions.
  • Fitting 2 does not require the implementation of any further elements to be associated with tube or pipe "C" in order to secure it to the fitting, thus facilitating the use of the fitting itself .
  • Control portion 33 Conduction element 4 Tubular portion 41 Trough-shaped portion 42 Clamping element 5 Inner perimeter 52 Locking device 6 First element 62 Annular base 620 Sealing protrusion 622 Second element 64 Body 640
  • Extractor device 7 Activation portion 70 Tubular portion 71 Discontinuity 712 Release element 73 Axis "A

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Abstract

Plug-in fitting (2) for tubes (C) of fluid conduction systems (1). The fitting comprises a body (3) having a cylindrical shape and defining a cavity (30) partly extending along a first axis (A), within which the following parts are appropriately positioned: at least one sealing element (T); at least one clamping element (5), one locking device (6) and one extractor device (7). The clamping element (5) is configured in such a way as to engage with an outer surface of the tube (C). The locking device (6) is adapted to limit the movement of the clamping element (5) along an axis (A). The extractor device (7) is adapted to move along the axis (A) and comprises: an activation portion (70); and a release element (73) adapted to interact with the clamping element (5) so as to reduce the engagement action exerted on the tube (C) by the clamping element (5). The locking device (6) comprises a first element (62) adapted to limit the movement of the clamping element (5) along the axis (A); a second element (64), distinct from the first element (62), adapted to connect, through a snap action, to a sealing portion (31) comprised in the cavity (30) of the body (3), which prevents a movement of the second element (64) along the axis (A). The second element (64) limits the movement of the first element (62) along the axis (A). The second element (64) is so shaped as to limit the movement of the extractor device (7) along the axis (A).

Description

TITLE: QUICK PLUG-IN FITTING WITH INTEGRATED EXTRACTOR DEVICE
The present invention relates, in general, to a quick plug-in fitting adapted for use in fluid conduction systems, such as, for example, compressed-air pneumatic circuits, particularly pneumatic systems for braking systems of vehicles, e.g. trucks, tractors, buses, trailer- trucks, etc.
Fittings are known which comprise a body, within which at least one sealing element, a conduction element and a clamping element are appropriately positioned, which are held in position by means of a locking device.
With such embodiment, in order to remove the tube or pipe it is necessary to use a suitable extractor tool, which is independent of the fitting, and which is adapted to act upon the clamping element to allow extracting the tube or pipe.
The design specifications, dictated by the customers, require that the extractor device be integrated into the fitting. In addition to increasing the number of components in the fitting, the integration of such an extractor device requires that the fitting be designed in such a way that the extractor device can be activated by an operator easily enough, that it will not be subject to unintentional activation, and that it will maintain the degree of axial sealing of the connection.
International patent application W02016/041603 describes a quick plug-in fitting with an integrated extractor device. The extractor device described therein, in addition to acting as an element capable of reducing the engagement action exerted on the tube or pipe by said clamping element, also performs a function as an axial sealing element and as a fitting locking device. In fact, the same extractor device acts as a locking device in an attempt to prevent the extraction of the components and devices of the fitting from the body of the fitting itself, e.g. when a pulling force is applied, for example, onto the tube or pipe. The solution proposed and described in said document considerably increases the risk that the entire extractor device might be disconnected from the body of the fitting, thus releasing the other elements suitably positioned in the body of the fitting. Therefore, such a solution appears to be unsafe and unreliable.
Technical solutions are also known wherein the clamping device, adapted to engage with the tube or pipe when the latter is inserted into the fitting, appears to be complex as concerns both design and operation. Such solutions are more subject to jamming or malfunctioning.
The present invention aims at solving the above- mentioned technical problems and many other problems by providing a fitting wherein the extractor device performs exclusively the extractor function, while the locking device is suitably shaped to integrate said extractor device without impairing the axial sealing of the fitting.
Furthermore, the present invention allows using simple clamping elements, thus reducing the risk of malfunctioning of the fitting. One aspect of the present invention relates to a fitting having the features set out in the appended claim
1.
A further aspect of the present invention relates to a pneumatic circuit having the features set out in the appended claim 10.
Auxiliary features of the fitting and pneumatic circuit are comprised in the dependent claims.
The features and advantages of the fitting and pneumatic circuit will become clear and apparent in the light of the different embodiments described in the present patent application and in the annexed drawings, wherein:
• Figure 1 shows, in an exploded perspective view, one possible embodiment of a plug-in fitting according to the present invention;
• Figures 2A and 2B show different exploded plan views of the fitting of Figure 1, in particular: Figure 2A shows a first exploded plan view of the fitting; Figure 2B shows a second exploded plan view of the fitting, turned by 90° about the longitudinal axis of the fitting, compared with the view of Figure 2A;
• Figure 3 shows a partially sectional side view of the fitting of Figure 1 in the assembled condition;
• Figures 4A and 4B show the fitting of Figure 3 coupled to a tube or pipe, in the different operating configurations of the fitting; in particular, Figure 4A shows the fitting in a partially sectional side view, with the extractor device deactivated; Figure 5B shows the fitting with the extractor device activated; • Figure 5 shows a detail of Figure 4B, wherein one can see the action exerted by the release element of the extractor device on the clamping element;
• Figures 6A and 6B show different details, at least partly sectioned, of the fitting according to the present invention, with respect to a section plane perpendicular to the section plane of Figure 3; in particular, Figure 6A shows the plug-in fitting of Figure 1 in the assembled condition; Figure 6B shows a detail of the fitting , wherein one can see the interaction between the first element and the second element of the locking device, with respect to the sealing portion of the cavity of the body of the fitting according to the present invention;
• Figure 7 shows a perspective view of a pneumatic circuit comprising fittings according to the present invention .
With reference to the above-mentioned figures, reference numeral 2 designates as a whole a plug-in fitting according to the present invention. Reference numeral 1 designates as a whole a pneumatic circuit, in particular pneumatic circuits for compressed-air braking systems for vehicles, comprising a plurality of tubes or pipes "C".
Quick plug-in fitting 2 is particularly suitable for joining together tubes or pipes "C" comprised in pneumatic circuits 1.
Fitting 2 according to the present invention comprises a body 3 having a substantially cylindrical shape and defining a through cavity 30 extending at least partly along an axis "A".
Within said cavity 30, the following parts are appropriately positioned: at least one sealing element "T"; at least one clamping element 5; at least one locking device 6 and at least one extractor device 7.
Preferably, a conduction element 4 is also appropriately positioned in said cavity 30.
In general, said at least one sealing element "T" is arranged, preferably in co-operation with said conduction element 4, in such a way as to seal the inner surface of said cavity 30 of body 3 from an inner surface of a tube or pipe "C" inserted in said body 3 along a assembly direction "F", preferably parallel to said axis "A".
Said clamping element 5 is configured in such a way as to engage with an outer surface of said tube or pipe "C".
Said locking device 6 is at least adapted to limit a movement of said clamping element (5), at least along said axis "A" of said clamping element 5, preferably movements along assembly direction "F", more preferably a movement in the direction opposite to assembly direction "F".
Said extractor device 7 is adapted to move along said axis "A Said extractor device 7 in turn comprises: an activation portion 70, adapted to allow the activation of extractor device 7; and a release element 73. Preferably, said extractor device 7 comprises also a tubular portion 71.
In a preferred embodiment, said activation portion 70 is arranged at one end of tubular portion 71; while said release element 73 is arranged at the opposite end of tubular portion 71.
Said release element 73 is adapted to interact with said clamping element 5 so as to vary the engagement action exerted on tube or pipe "C" by said clamping element 5 as a function of the action exerted on said activation portion 70, and in particular of the movement of extractor device 7 along said axis "A" . In particular, said release element 73 is adapted to reduce the engagement action exerted on tube or pipe "C" by said clamping element 5.
In the preferred embodiment of said fitting 2 according to the present invention, said locking device 6 comprises: a first element 62 and a second element 64, preferably distinct from each other and therefore not forming a monolithic element.
Said first element 62 is adapted to limit the movement of said clamping element 5 along said axis "A". Preferably, said first element 62 is also adapted to guide, at least partly, said extractor device 7 in its movement along said axis “A".
Said second element 64 is adapted to connect, through a snap action, to a sealing portion 31 comprised in cavity 30 of body 3. Said sealing portion 31, co-operating with the second element 64, prevents a movement of said second element 64 along said axis "A".
Said second element 64 is so shaped as to limit at least a movement of said first element 62 of locking device 6 at least along said axis "A".
Said second element 64 is so shaped as to limit at least a movement of said extractor device 7 at least along said axis "A".
Through extractor device 7, fitting 2 according to the present invention makes it possible to selectively disconnect a tube or pipe "C" from fitting 2.
The solution according to the present invention integrates extractor device 7, thereby improving the resistance of fitting 2 to pulling forces exerted along said axis "A", e.g. exerted on the tube or pipe connected to the fitting. In fact, said extractor device 7 is relieved from any direct function of resisting pulling forces applied along said axis "A". The present invention thus allows solving the technical problems suffered by the prior art .
Moreover, the present solution does not require any special instruments and/or tools adapted to interact with said clamping element 5, in order to vary the engagement action exerted on tube or pipe "C" by said clamping element
5.
The present solution makes it possible to simplify the structure of clamping element 5, facilitating the intentional activation of extractor device 7.
In general, the extension and shape of said body 3 may change as required. For example, said body 3 may have an elbow shape, a "T" shape, a "Y" shape, or a simple tubular shape .
In one possible exemplary, but non-limiting, embodiment, said body 3 may comprise a control portion 33 that allows orienting body 3. Said control portion 33 may be formed in body 3 as a monolithic piece or may be sealingly coupled to body 3. Said control portion 33 may be an increased outside diameter of body 3 adapted to co operate with a tool, e.g. a spanner, preferably an open spanner, being preferably hexagonal in shape.
In alternative embodiments, said body 3 may have a tubular shape, thus implementing a union device, e.g. comprising two conduction elements 4, two clamping elements 5, two locking devices 6 and two extractor devices 7 arranged at both ends of body 3. Referring back to the aspects concerning the construction of fitting 2 according to the present invention, in a preferred, but non-limiting, embodiment at least one sealing portion 31 is formed in cavity 30 of body 3, preferably as an undercut, with respect to a assembly direction "F", preferably a groove, more preferably a step like diameter discontinuity. At least said second element 64 is adapted to interact with said sealing portion 31 of body 3 for the purpose of preventing the extraction of the components and devices arranged in cavity 30 of body 3 when a pulling force is exerted along said axis "A", preferably in the direction opposite to assembly direction "F".
More in general, in fitting 2 according to the present invention the number of sealing elements "T" may vary as a function of specific needs and of the required degree of tightness. Moreover, some embodiments of fitting 2 also comprise further sealing elements "T" in addition to sealing element "T" positioned in cavity (30) of body 3, depending on the conformation of body 3, e.g. in proximity to threaded connection portions, as shown by way of example in Figures 3, 4A, 4B and 6A.
Describing more in detail the construction of fitting 2 according to the present invention, said second element 64 comprises a hollow body 640, e.g. annular in shape. From said body 640, at least one pair of fins 642 extend. Preferably, said fins extend substantially along axis "A".
Each fin 642 is adapted to connect, through a snap action, to sealing portion 31 comprised in cavity 30 of body 3. Such fins 642 therefore limit the movement of said first element 62, and hence of said clamping element 5, along said axis "A". In a preferred, but non-limiting, embodiment of the second element 64, said pair of fins 642 is arranged along the perimeter of said body 640, so that said fins 642 are in diametrically opposite positions.
In a preferred embodiment, said fins 642, in particular at least a tract thereof, are preferably inclined relative to said axis "A", e.g. inclined radially towards body 640. Preferably, each fin 642, or at least a portion thereof, is inclined radially by an angle of 3° to 10°, e.g. approx. 5°.
In general, each fin 642, or at least a part thereof, is elastically deformable.
In one possible embodiment, once the second element 64 of locking device 6 has been assembled in the cavity of body 3, it will no longer be possible to separate the second element 64 from body 3 without irremediably damaging at least one of the two parts.
In a preferred embodiment of fitting 2 according to the present invention, said first element 62 comprises an annular base 620. From said base 620, at least one pair of sealing protrusions 622 extend. Preferably, said sealing protrusions extend along said axis "A".
Each sealing protrusion 622 is adapted to connect, e.g. through a snap action, preferably by shape coupling, to a sealing portion 31 comprised in cavity 30 of body 3, e.g. the same sealing portion 31 to which said second element 64 connects. Preferably, once the first element 62 of locking device 6 has been assembled in the cavity of body 3, it will no longer be possible to separate the first element 62 from body 3 without irremediably damaging at least one of the two parts. This connection, preferably obtained by shape coupling, is such as to prevent any movement of the first element 62 along said axis "A".
In a preferred, but non-limiting, embodiment of said pair of sealing protrusions 622, they are arranged along the perimeter of said base 620, more preferably in such a way that said sealing protrusions 622 are in diametrically opposite positions.
In a preferred embodiment of fitting 2 according to the present invention, once the first element and the second element have been appropriately assembled in cavity 30 of body 3, said sealing protrusions 622 are aligned along an axis perpendicular to the axis along which said fins 642 are arranged.
Preferably, fitting 2 according to the present invention is configured in such a way that said body 640 of the second element 64 comprises an external surface, which in turn is shaped in such a way as to exert a force along an axis transversal with respect to said axis "A" on said sealing protrusions 622 of the first element 62, so as to move them away from each other. Such transversal force applied to sealing protrusions 622 by body 640 results from a pulling force exerted on the second element 64 along said axis "A".
Due to the presence of said sealing protrusions 622, the present embodiment of fitting 2 according to the present invention provides a further safety system preventing the elements positioned in cavity 30 of body 3 from coming out under a pulling force exerted at least along said axis "A". In fact, the co-operation between the first element 62, particularly said sealing protrusions 622, and the second element 64 generates a wedge-shaped system that increases the safety and reliability of fitting 2 according to the present invention. In fact, if a pulling force is exerted on tube or pipe "C" plugged in fitting 2 when extraction device 7 is in the inactive condition, said sealing protrusions 622 will be pushed into sealing portion 31 of cavity 30, in particular by said body 640 of the second element 64. Said sealing protrusions 622, as they penetrate into sealing portion 31, thus generating a shape coupling, will act as a wedge because they will remain spread apart. In this condition, the safety of fitting 2 is improved, since the components are prevented from coming out of body 3 of fitting 2.
A preferred embodiment of the second element 64 of locking device 6 comprises an abutment portion 641. Said abutment portion 641 is comprised in body 640 of the second element 64. Preferably, said abutment portion 641 is located in the inner perimeter of said annular body 640 of the second element 64.
In a preferred embodiment of fitting 2 according to the present invention, tubular portion 71 of extractor device 7 comprises a discontinuity 712. Such discontinuity 712 is adapted to abut against said abutment portion 641 comprised in body 640 of the second element 64 of locking device 6.
Said discontinuity 712 is a protrusion protruding radially from the outer surface of tubular portion 71, preferably extending circumferentially around the outer perimeter of tubular portion 71. In an alternative embodiment, said discontinuity 712 is a plurality of indentations arranged along the circumferential perimeter of said tubular portion 71. Preferably, said discontinuity 712 is at least partly sawtooth-shaped. Preferably, said discontinuity is located in a central region of tubular portion 71.
Such discontinuity 712 contributes to defining the travel of extractor device 7 along said axis "A".
Said activation portion 70 has an annular shape, with an outside diameter greater than the outside diameter of tubular portion 71. Preferably, the outside diameter of said activation portion is equal to or greater than the diameter of cavity 30 of body 3.
The diameter of said tubular portion 71 is such that it can go through both said annular body 640 of the second element 64 and said annular base 620 of the first element 62.
Said release element 73, preferably a tapered portion of the end of tubular portion 71 that reduces the outside diameter thereof, is so shaped as to come between the outer walls of tube or pipe "C" and said clamping element 5, so that it allows changing the interaction between clamping element 5 and tube or pipe "C" as a function of the movement made by extractor device 7 along said axis "A".
In a preferred embodiment, the reduction in the outside diameter of tubular portion 71, according to a known progression, permits release element 73 to come between the outer walls of tube or pipe "C" and said clamping element 5.
Preferably, said release element 73 is adapted to increase the diameter of said clamping element 5, thereby reducing its action upon said tube or pipe "C". Preferably, the action of release element 73 due, for example, to its conformation, is such as to prevent clamping element 5 from moving along said axis "A" when said abutment element 73 is interacting with clamping element 5, thus avoiding that the outer surface of clamping element 5 might abut on the tapered portion of annular base 620 of the first element 62, which would prevent its diameter from changing. In general, said extractor device 7 is adapted to take two operating configurations: an active configuration, in which it reduces the interaction between clamping element 5 and tube or pipe "C" inserted in fitting 2, thus allowing the same tube or pipe "C" to be removed from fitting 2; and an inactive operating configuration, in which it does not affect the interaction between clamping element 5 and tube or pipe "C".
In one possible exemplary, but non-limiting, embodiment, the switching of extractor device 7 from the inactive operating configuration to the active operating configuration can be achieved by exerting a force on activation portion 70 along said axis "A" in assembly direction "F". Such force may be applied either manually or through the use of a tool, e.g. pliers.
In the same embodiment, the switching of extractor device 7 from the active operating configuration to the inactive operating configuration can be achieved by exerting a force on activation portion 70 along said axis "A" in the direction opposite to assembly direction "F". Such force may be applied either manually or through the use of a tool, e.g. pliers. Preferably, fitting 2 is so designed that, when a tube or pipe "C" is inserted into fitting 2, the insertion of tube or pipe "C" will cause the deactivation of extractor device 7, resulting in extractor device 7 sliding along said axis "A" in the direction opposite to assembly direction "F".
Preferably, said extractor device 7 and said locking device 6 are suitably shaped in such a way that, when said extractor device 7 is in the inactive configuration, said discontinuity 712 abuts against abutment portion 641 comprised in body 640 of the second element 64 of locking device 6. Moreover, said extractor device 7 and said locking device 6 are suitably shaped in such a way that, when said extractor device 7 is in the active configuration, said discontinuity 712 abuts against said annular base 620 of the first element 62 of locking device 6.
More in general, said abutment portion 641 of the second element 64 and said annular base 620 of the first element 62 of locking device 6 define the end-of-travel points for the movement of extractor device 7 along said axis "A" when switching between the different operating configurations, particularly by interacting with said discontinuity 712 comprised in tubular portion 71. Therefore, the distance between said abutment portion 641 of the second element 64 and said annular base 620 of the first element 62 defines the travel that extractor device 7 is allowed to cover along said axis "A".
Preferably, said extractor device 7 and said locking device 6 are also suitably shaped in such a way that, when said extractor device 7 is in the active configuration, the activation portion 70 abuts, at least partly, on said second element 64, preferably against a face of said body 640. In a preferred, but non-limiting, embodiment, said second element 64 comprises a body 640, which comprises a first base from which said abutment portion 641 extends.
In a preferred exemplary, but-non limiting, embodiment, each fin 642 comprises a first tract, extending parallel to said axis "A" and having first elastic properties, and a second tract, at least partly inclined relative to said axis "A" and having second elastic properties. Said second tract of the fins preferably has greater elastic properties than the first tract, which is more rigid. Preferably, said first tract extends from said body 640 of the second element 64, along said axis "A", whereas said second tract starts from the distal end of said first tract, arranging itself in such a way as to approach said body 640 again.
In an alternative embodiment, each fin 642 extends from the base of said body 640, which is proximal to the first element 62 of the locking device, when fitting 2 has been appropriately assembled.
In a preferred exemplary, but non-limiting, embodiment, each sealing protrusion 622 protrudes from said annular base 620 of the first element 62 at the portion thereof which is proximal to the second element 64 of the locking device, when fitting 2 has been appropriately assembled .
The conformation of said fins 642 and said sealing protrusions 622 is such as to define a shape coupling, when said first element 62 and said second element 64 of locking device 6 are assembled in fitting 2 according to the present invention. Preferably, the gap left by two sealing protrusions 622 along the perimeter of said annular base 620 is such as to receive a fin 642, and/or the gap left by two fins 642 along the perimeter of said body 640 is such as to receive a sealing protrusion 622.
More in general, the arrangement of sealing protrusions 622 and fins 642 is so designed that all of them, when locking device 6 has been assembled in fitting 2, can abut on a sealing portion 31 of body 3 of fitting 2, more preferably on the same sealing portion 31 comprised in cavity 30 of body 3.
In one possible embodiment of fitting 2 according to the present invention, the conformation of said sealing portion 31, said sealing protrusion 622 and/or said fins 642 is such as to prevent the rotation of said first element 62 and said second element 64 about said axis "A".
In a preferred embodiment of fitting 2 according to the present invention, said clamping element 5 has an incomplete annular shape and is monolithic. In such an embodiment, a single component constitutes clamping element 5.
Since it has an open annular shape, clamping element 5 is adapted to be elastically deformed. Said clamping element 5 is preferably made of metallic material.
In the present embodiment of clamping element 5, it comprises an inner perimeter 52 adapted to abut against a tube or pipe "C" in order to retain it in fitting 2.
Preferably, said inner perimeter 52 is continuous, having no notches or interspaces increasing its elastic properties. Therefore, clamping element 5 is easy to manufacture .
More preferably, said clamping element 5 externally defines a conical structure. Preferably, said clamping element 5 is so arranged that the minor base of the conical structure faces towards the first element 62 of the locking device, abutting against a face of annular base 620 of the first element 62 when said clamping element 5 is appropriately assembled in fitting 2 according to the present invention. Said inner profile 52 is suitably tapered to optimize the interaction action exerted on tube or pipe "C" by clamping element 5. The shape of said inner profile 52 of clamping element 5 is illustrated in detail, for example, in Figure 5.
Preferably, fitting 2 according to the present invention comprises a single monolithic clamping element 5.
In general, said sealing element "T" is preferably a gasket, e.g. an 0-ring.
In one possible embodiment of said conduction element 4, it comprises a tubular portion 41 adapted to penetrate into tube or pipe "C", abutting on the inner walls of the same tube or pipe "C"; and a trough-shaped portion 42 adapted to abut against the edges or lips of tube or pipe "C" inserted in fitting 2. Said trough-shaped portion 42 is adapted to define a seat through which, in co-operation with sealing element "T", it is possible to ensure tightness with the cavity of said body 3 of fitting 2.
Fitting 2 according to the present invention is particularly suitable for use in pneumatic circuits 1.
Pneumatic circuit 1 according to the present invention is particularly suitable for use in compressed-air braking systems for vehicles.
Preferably, said pneumatic circuit 1 comprises a plurality of tubes or pipes "C". In a preferred embodiment, said pneumatic circuit 1 comprises at least one first section 11 and at least one second section 12. Said at least one first section 11 is connected to at least one second section 12 by means of a fitting 2 according to the present invention. Figure 7 shows, by way of non-limiting example, a pneumatic circuit 1 comprising one or more fittings 2 according to the present invention. In particular, it shows two fittings 2 in an assembled configuration, in particular an adjustable axial fitting 2 and an elbow fitting.
To the ends of each fitting 2, tubes or pipes "C" comprised in first sections 11 and/or second sections 12 of pneumatic circuit 1 are suitably connected. Said first section 11 may have structural characteristics, e.g. dimensions, materials, etc., that are different from those of the second section 12. Said fitting 2 is thus adapted to connect two or more sections of a pneumatic circuit 1.
Said pneumatic circuit 1 may internally comprise one or more valves, one or more sensors and one or more tanks as a function of the characteristics and functionalities of pneumatic circuit 1 that needs to be implemented.
In one possible embodiment, said fitting 2 is capable of connecting said first section 11 and/or said second section 12 to one or more valves, one or more sensors and/or one or more tanks.
With reference to the illustrated embodiments, Figure 1 shows, in an exploded perspective view, one possible embodiment of a plug-in fitting 2 according to the present invention .
Figure 1 shows the parts and components of the fitting along axis "A" in assembly direction "F". In the illustrated embodiment, body 3 comprises a cavity 30 adapted to house, with reference to assembly direction "F", said conduction element 4, a sealing element "T", particularly an 0-ring, a clamping element 5 and a locking device 6, in turn comprising a first element 62 and a second element 64. In addition, fitting 2 according to the present invention comprises an extractor device 7, in turn comprising an activation portion 70, a tubular portion 71 and a release element 73.
In the illustrated embodiment, said first element 62 and said second element 64 are distinct and independent and have complementary shapes, so that they will mate together when assembled in fitting 2.
Figure 2A shows an exploded plan view of fitting 2. In the illustrated embodiment, said body 3 comprises a control portion 33 having a regular shape, in particular a hexagonal shape, so that it can co-operate with a tool, e.g. a spanner, in particular an open spanner.
Cavity 30 of body 3 houses the elements of fitting 2, in particular a conduction element 4, which comprises a tubular portion 41 and a trough-shaped portion 42. Said conduction element 4 is adapted to co-operate with a sealing element "T", implemented as an 0-ring, to ensure the necessary tightness of fitting 2.
Within cavity 30 there is also a clamping element 5 having a truncated conical shape.
Said cavity 30 also houses locking device 6, in turn comprising a first element 62 and a second element 64. Said first element 62 is distinct from and independent of said second element 64. Said first element 62, which comprises an annular base 620, is visible in Figure 2A.
Figure 2A also shows said second element 64, which comprises a body 640 and a pair of fins 642 extending from said body 640 along said axis "A".
On top of locking device 6 there is extractor device 7. In the illustrated embodiment, extractor device 7 comprises: an activation portion 70; a tubular portion 71, in turn comprising a discontinuity 712; and a release element 73.
Figure 2B shows a second exploded plan view of fitting 2, turned by 90° about said axis "A" compared to the view of Figure 2A.
Figure 2B better illustrates the conformation of control portion 33 of body 3.
In comparison with Figure 2A, Figure 2B allows understanding that conduction element 4, sealing element "T" and clamping element 5 have rotation symmetry relative to said axis "A".
Compared to Figure 2A, Figure 2B makes it possible to understand further construction details of locking device 6, in particular of the first element 62 and second element 64.
In fact, Figure 2B shows further construction details of the first element 62, which comprises sealing protrusions 622 extending from annular base 620.
Figure 2B also makes it possible to understand the conformation of body 640 of the second element 64.
Just like Figure 2A, also Figure 2B shows that there is a shape coupling between the first element 62 and the second element 64. On top of locking device 6, extractor device 7 is arranged. In the illustrated embodiment of the extractor device, in comparison with Figure 2A, it is possible to see the rotation symmetry relative to said axis "A" of activation portion 70, tubular portion 71, discontinuity 712 and release element 73.
Figure 3 shows a partially sectional side view of the plug-in fitting of Figure 1 in the assembled condition.
The figure shows one possible arrangement of the various parts comprised in fitting 2 within cavity 30 of body 3.
In the illustrated embodiment, fitting 2 comprises a conduction element, which comprises a tubular portion 41 and a trough-shaped portion 42.
Said sealing element "T" co-operates with the conduction element to seal the inner surface of said cavity 30 of the body 3.
In Figure 3 clamping element 5 is visible, which has a truncated conical shape. The shape of said clamping element is such that it can act upon a tube or pipe and retain it within fitting 2.
Figure 3 shows how said first element 62 of locking device 6 is arranged within cavity 30 of body 3. The figure also makes it possible to understand how said first element 62 permits holding said clamping element 5 in position, preventing it from moving along said axis "A".
The conformation of annular base 620 of the first element 62 preferably acts as a guide for extractor device 7 in its movement along said axis "A".
Said second element 64 is adapted to arrange itself appropriately with respect to the first element 62. Preferably, a part of said fins 642 of the second element 64 is adapted to abut against annular base 620 of the first element 62.
In Figure 3 a fin 642 is visible, which is adapted to abut against sealing portion 31, in particular a housing, formed in the walls of cavity 30 of body 3.
In Figure 3 one can see abutment portion 641 against which discontinuity 712 of extractor device 7 abuts.
Figure 3 shows the extractor device in an inactive configuration, in which it does not affect the engagement action exerted by said clamping element 5 on a tube or pipe "C" inserted in fitting 2. In fact, said extractor device 7 does not interact with said clamping element 5.
Figure 3 also shows that the radial dimension of activation portion 70 is greater than or equal to the one defined by the aperture of cavity 30 of body 3.
Figure 3 additionally shows a second sealing element "T" placed under said control portion 33 of body 3.
Figure 4A shows plug-in fitting 2 of Figure 3 coupled to a tube or pipe "C", wherein extractor device 7 is inactive .
The embodiment illustrated in the drawing shows the positioning of tube or pipe "C" relative to the various elements of fitting 2. In particular, it shows that tubular portion 41 of the conduction element is inserted in tube or pipe "C". Furthermore, trough-shaped portion 42 is adapted to receive the end of tube or pipe "C", thus ensuring tightness through sealing element "T".
The figure also makes it apparent that tube or pipe "C" is inserted in a through hole in extractor device 7, which encircles the outer surface of tube or pipe "C". In the illustrated embodiment, extractor device 7 is inactive, and therefore said discontinuity 712, comprised in tubular portion 71, is in abutment with abutment portion 641 comprised in body 640 of the second element 64. In this configuration of extractor device 7, activation portion 70 is distant from body 640 of the second element 64. In such a configuration, as shown in the drawing, release element 73 does not interact with clamping element 5.
The same clamping element 5 is held in position by the first element 62 of the locking device. The shape of base 620 is such as to hold in position said clamping element 5, preventing it from moving along said axis "A". If an extraction force is applied to clamping element 5 along said axis "A" in the direction opposite to assembly direction "F", the conformation of annular base 620 is such as to increase the clamping action exerted by clamping element 5 on tube or pipe "C", thus reducing the possibility of extraction of tube or pipe "C" from fitting 2.
In the illustrated embodiment a fin 642 is visible, which interacts with sealing portion 31 formed in cavity 30 of body 3. The interaction between said fin 642 and said sealing portion is such as to prevent the unintentional extraction of locking device 6 from body 3 of fitting 2.
Figure 4B shows plug-in fitting 2 of Figure 3 coupled to a tube or pipe "C", wherein extractor device 7 is in the active condition.
The embodiment illustrated in Figure 4B shows the positioning of pipe or duct "C" with respect to the various elements of fitting 2 when extractor device 7 is in the active condition, particularly in comparison with Figure 4A.
In the illustrated embodiment, extractor device 7 is active, and the same extractor device 7 has been moved along axis "A" in assembly direction "F". In this configuration, said discontinuity 712 is no longer in abutment with abutment portion 641 comprised in body 640 of the second element 64, but abuts against annular base 620 of the first element 62. In this configuration of extractor device 7, activation portion 70 is in abutment with body 640 of the second element 64. In such a configuration, as shown in the drawing, release element 73 interacts with clamping element 5, in particular keeping it apart from tube or pipe "C".
Clamping element 5, held in position by the first element 62 of locking device 6, no longer engages the outer surface of said tube or pipe "C", thus permitting the same tube or pipe "C" to be extracted from fitting 2.
The movement of extractor device 7 along axis "A" causes no variation in the interaction between fin 642 and sealing portion 31 formed in cavity 30 of body 3. Therefore, it will be possible to extract tube or pipe "C" without the risk that some of the elements of fitting 2 might be unintentionally extracted from body 3 of fitting 2.
Figure 5 shows a detail of Figure 4B, wherein one can see the action exerted on clamping element 5 by release element 73 of extractor device 7.
In particular, one can see how release element 73 prevents clamping element 5, and particularly inner perimeter 52 thereof, from acting against the outer surface of said tube or pipe "C".
In the illustrated embodiment, extractor device 7, and in particular release element 73, is such as to vary the diameter of clamping element 5, thereby varying also the possible interaction between the same clamping element 5, in particular inner perimeter 52 thereof, and the outer surface of tube or pipe "C".
In Figure 5 one can see that release element 73 positions itself between the outer surface of tube or pipe "C" and inner perimeter 52 of clamping element 5.
Figure 5 also shows how said first element 62 and said second element 64 position themselves with respect to each other .
Figure 5 also shows one possible embodiment of the fitting, wherein tightness is ensured by means of a sealing element "T" in the form of an 0-ring.
Figure 6A shows a partial sectional view of the plug in fitting of Figure 1 in the assembled condition, wherein the section refers to a plane perpendicular or rotated by 90° relative to the section plane of Figure 3.
From this figure it is possible to understand the interaction between the first element 62 and the second element 64 of locking device 6 from another point of view.
The figure shows the extractor device 7 in the inactive condition. As shown in Figure 6A, discontinuity 712 is in abutment with abutment portion 641 comprised in body 640 of the second element 64. As already illustrated in Figure 3 and Figure 4A, extractor device 7 is inactive, and therefore activation portion 70 is distant from body 640 of the second element 64. Figure 6A clearly shows the interaction between said sealing protrusion 622 and sealing portion 31 of cavity 30 of body 3.
Figure 6B shows a detail of the fitting, in which one can see the mutual interaction between the first element 62 and the second element 64 of locking device 6, as well as the interaction of the same with respect to sealing portion 31 of cavity 30 of body 3 of fitting 2 according to the present invention.
Figure 6B shows that sealing protrusion 622 is so designed as to interact, by generating a shape coupling, with sealing portion 31. Also fins 642 comprised in the second element 64, not visible in Figure 6B, interact with the same sealing portion 31, as can be easily understood from the other figures, e.g. Figure 3.
From Figure 6B it is possible to understand the co operation between the first element 62, and in particular said sealing protrusions 622, and the second element 64, which results in a wedge-shaped system, as previously specified, that increases the safety and reliability of fitting 2 according to the present invention.
In Figure 6B one can also identify further construction details of a possible embodiment of annular base 620, of body 640 and of extractor device 7, and in particular of tubular portion 71 and of release element 73.
Quick plug-in fitting 2 according to the present invention is particularly suitable for use with tubes or pipes "C" made of polyamide 11/12, or polyamide 10/12, polyamide 12, or elastomeric polyester. Fitting 2 according to the present invention is adapted to comply with the following specifications: DIN 74324, DIN 73378, ISO 7628 and SAE J2494-3.
Fitting 2 according to the present invention, and in particular said body 3, can be manufactured by using different copper alloys, including:
- reference number EN 12164, alloy number CW614N, symbol CuZn39Pb3;
- reference number EN 12165, alloy number CW617N, symbol CuZn40Pb2.
Furthermore, fitting 2 according to the present invention, and in particular locking device 6 and extractor device 7, can be manufactured by using different semi finished products of polyamide, including: PA 66 GF30; PA 6.10 GF30, PA 12 GF 30, PA 12 GF50, PA 6.12 GF30 and PA 6.12 GF50.
Furthermore, fitting 2 according to the present invention, and in particular said sealing elements "T", can be made of rubber, including EPDM, NBR and HNBR.
The thermal operating range of fitting 2 is preferably comprised between +100°C and -40°C. The maximum operating pressure is, for example, approximately, preferably equal to, 15bar.
Fitting 2 according to the present invention makes it possible to eliminate the use of external extractor devices, since extractor device 7 is already integrated into fitting 2. The present solution allows reducing the number of parts to be purchased, eliminating the risk of not being able to remove tube or pipe "C" because the specific extractor device is unavailable. Fitting 2 according to the present invention makes it possible to increase the flexibility of use of the fitting, since it can also be applied in challenging environments, e.g. difficult to reach due to obstacles and/or insufficient room.
Fitting 2 according to the present invention permits manufacturing the standard components of a fitting in the same way as the solutions currently known in the art, so that the production costs of the fitting are reduced; for example, said body 3 can be easily made from brass.
Fitting 2 according to the present invention, since it has a reduced number of parts, is easy to assemble.
Fitting 2 according to the present invention ensures a high degree of reliability, while facilitating the intentional extraction of tube or pipe "C" from fitting 2.
Fitting 2 according to the present invention does not require the use of springs or elastic elements for changing the engagement action exerted by clamping element 5 on the outer surface of said tube or pipe "C". Therefore, fitting 2 allows the use of clamping elements 5 having a simple shape, with no fins or snap-action elements, which can be easily manufactured and are less subject to malfunctions.
Fitting 2 according to the present invention does not require the implementation of any further elements to be associated with tube or pipe "C" in order to secure it to the fitting, thus facilitating the use of the fitting itself .
Any alternative embodiments which have not been described or illustrated in detail herein, but which can be easily inferred by a person skilled in the art in the light of the present description and of the annexed drawings, should be considered to fall ithin the protection scope of the present invention.
REFERENCE NUMERALS
Pneumatic circuit 1
First section 11
Second section 12
Fitting 2
Body 3
Cavity 30
Sealing portion 31 Control portion 33 Conduction element 4 Tubular portion 41 Trough-shaped portion 42 Clamping element 5 Inner perimeter 52 Locking device 6 First element 62 Annular base 620 Sealing protrusion 622 Second element 64 Body 640
Abutment portion 641 Fins 642
Extractor device 7 Activation portion 70 Tubular portion 71 Discontinuity 712 Release element 73 Axis "A
Assembly direction "F Sealing elements (O-rings
Figure imgf000031_0001
Tube or pipe "C

Claims

CLAIMS :
1. Plug-in fitting (2) for tubes or pipes (C) of pneumatic circuits (1);
said fitting comprising a body (3) having a substantially cylindrical shape and defining a through cavity (30) extending at least partly along an axis (A) , within which the following parts are appropriately positioned; at least one sealing element (T); at least one clamping element (5); at least one locking device (6) and at least one extractor device ( 7 ) ;
said clamping element (5) is configured in such a way as to engage with an outer surface of a tube or pipe (C) ;
said locking device (6) being at least adapted to limit a movement of said clamping element (5) at least along said axis (A) ;
said extractor device (7), adapted to move along said axis (A), comprising: an activation portion (70), adapted to allow the activation of the extractor device (7); and a release element (73), which is adapted to interact with said clamping element (5) so as to vary the engagement action exerted on the tube or pipe (C) by said clamping element (5) as a function of the action exerted on said activation portion (70);
said fitting (2) being characterized in that:
said locking device (6) comprises:
- a first element (62) adapted to limit the movement of said clamping element (5) along said axis (A);
- a second element (64), distinct from said first element (62), adapted to connect, through a snap action, to a sealing portion (31) comprised in the cavity (30) of the body (3), preventing a movement of said second element (64) along said axis (A) ;
said second element (64) is so shaped as to limit at least a movement of said first element (62) of the locking device at least along said axis (A) ;
said second element (64) is so shaped as to limit at least a movement of said extractor device (7) at least along said axis (A) .
2. Fitting according to claim 1, wherein said second element (64) comprises a hollow body (640), from which at least one pair of fins (642) extend; each fin being adapted to connect, through a snap action, to the sealing portion (31) comprised in the cavity (30) of the body (3) .
3. Fitting according to claim 2, wherein said pair of fins (642) are arranged along the perimeter of said body (640), so that said fins (642) are in diametrically opposite positions.
4. Fitting (2) according to claim 1 or 2, wherein said first element (62) comprises an annular base (620), from which at least one pair of sealing protrusions (622) extend; each sealing protrusion (622) being adapted to connect by shape coupling to a sealing portion (31) comprised in the cavity (30) of the body (3) for the purpose of preventing any movement of said first element (62) along said axis (A) .
5. Fitting according to claim 4, wherein:
- said pair of sealing protrusions (622) are arranged along the perimeter of said base (620), in such a way that said sealing protrusions (622) are in diametrically opposite positions .
6. Fitting according to claims 3 and 5, wherein said sealing protrusions (622) are arranged along an axis perpendicular to the axis along which said fins (642) are arranged .
7. Fitting according to claims 2 and 4, wherein said body (640) of the second element (64) comprises an outer surface shaped in such a way as to exert a force along an axis transversal with respect to said axis (A) on said sealing protrusions (622) of the first element (62), such as to move them away from each other, when a pulling force is exerted, along said axis (A), on the second element (64) .
8. Fitting (2) according to one of the preceding claims, wherein the extractor device (7) comprises a tubular portion (71), in turn comprising a discontinuity (712) adapted to abut against an abutment portion (641) located in the inner perimeter of said body (640) of the second element (64) of the locking device (6) .
9. Fitting (2) according to one of the preceding claims, wherein said clamping element (5) has an open annular shape, is monolithic, adapted to be elastically deformed, and comprising an inner perimeter (52) adapted to abut against a tube or pipe (C) , for the purpose of retaining it in the fitting (2) .
10. Pneumatic circuit (1) for compressed-air braking systems for vehicles, comprising a plurality of tubes or pipes (C) ;
said pneumatic circuit (1) comprising at least one first section (11) and at least one second section (12); said at least one first section (11) is connected to at least one second section (12) by means of a fitting (2), characterized in that said fitting (2) is a fitting according to one of the preceding claims.
PCT/IB2019/057765 2018-09-18 2019-09-16 Quick plug-in fitting with integrated extractor device WO2020058818A1 (en)

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IT201800008677 2018-09-18

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0738851A1 (en) * 1995-04-13 1996-10-23 Smc Kabushiki Kaisha Easy-connect-and-disconnect tube coupling
EP0957306A2 (en) * 1998-05-13 1999-11-17 Smc Kabushiki Kaisha Tube joint and apparatus for producing the same
EP2949984A1 (en) * 2012-11-07 2015-12-02 Hita Technology of Plastic System S.L. Rapid-action coupling for pipes
WO2016041603A1 (en) * 2014-09-19 2016-03-24 Kongsberg Automotive As Tube connector

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0738851A1 (en) * 1995-04-13 1996-10-23 Smc Kabushiki Kaisha Easy-connect-and-disconnect tube coupling
EP0957306A2 (en) * 1998-05-13 1999-11-17 Smc Kabushiki Kaisha Tube joint and apparatus for producing the same
EP2949984A1 (en) * 2012-11-07 2015-12-02 Hita Technology of Plastic System S.L. Rapid-action coupling for pipes
WO2016041603A1 (en) * 2014-09-19 2016-03-24 Kongsberg Automotive As Tube connector

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