CONNECTOR FOR DEVICES DESIGNED TO BE FITTED ONTO CONDUITS IN A PRESSURIZED FLUID SYSTEM

Abstract: A connector (10) designed to be fitted onto a conduit of a pressurized fluid system, comprising an element (15) disposed with one rotatable cylindrical end sliding tightly in an axial direction within a complementary housing (13). Said conduit is screwable onto a protruding portion (21) of the element (15) and clasping means are provided to impede the movement of the element (15) after it has been fitted onto the conduit. Said clasping means comprise a stop ring (17) radially tightenable on the element (15) by turning a screw (24).

Description: Those engaged in installing hydraulic, pneumatic or other types of fluid systems with airtight pipes are acquainted with the problems which exist during installation in securing the connectors fitted on the various fixed devices in the system to the pipes onto which they are to be fitted. These problems are basically due both to the tolerances in cutting the pipes to size and to the necessary allowance which must be left for the axial movement of the connectors when they are screwed on and, moreover, to the fact that it is almost always impossible to rotate fixed devices or pipes. In the known technique a solution was sought by providing additional connecting means in the form of an adapter, with suitably movable portions, connectable between the threaded end of the pipe and the corresponding connector fitted on the fixed device. This solution, which implies the use of a further component (the adapter), increases fitting times, entails an additional expense and gives rise to the need to keep a stock of these components, which must also be differentiated in size according to the diameter of the pipes to be connected. A different solution in described in FR-A-2 496 220. Said reference discloses a connector for the fitting of the extremity of a smooth tube. The tube extremity is fitted by force in a seat of the connector in this way being tightly sealed by means of a gasket. A ring tightens the tube in order to prevent the sliding from its seat in the connector. The scope of this invention is to obviate the aforementioned and other problems by providing a connector integrated with any type of device used in a pressurized fluid system, which allows the necessary freedom of movement for screwing a pipe onto it. The aforesaid scope is achieved by providing a connector for devices designed to be fitted onto conduits in a pressurized fluid system, including an element to be screwed onto a complementary conduit mouthpiece, characterized by the fact that said element comprises a first end threaded to be screwed to the complementary mouthpiece and a cylindrical portion at the opposite second which is fitted in an axially and rotatably movable way in a complementary housing in the device and is airtight therewith, clasping means being provided in the body of the device to clasp around said element in order to prevent the movement of said element once it has been fitted onto the mouthpiece. The advantages of this invention with respect to the known technique can be more clearly understood from the following description of a possible exemplary embodiment, with reference to the accompanying drawings, in which: figure 1 shows a schematic front partial cross-sectional view along line I-I of figure 2, of an integrated connector constructed according to the invention; figure 2 shows a lateral cross-sectional view along line II-II of figure 1. With reference to the figures, an integrated connector, generically indicated by reference 10, applying the innovatory principles of this invention, comprises a connecting head 11, disposed on a generic device to be connected which, since it can be of any known type, is neither shown nor further described. Said head is provided with a duct 12, end of the duct of the device to be connected, and a generically toroidal groove 13, coaxial to the duct to form a tubular end 14 over which a generically cylindrical axially perforated coupling 15 is movably and rotatably partially fitted to form a prolongation of the duct 12. A second toroidal groove, concentric to the first, constitutes an enlargement 16 of the latter and a housing for a stop ring 17, cut along a radius to form a slot 29, and with its internal portion partially protruding into the groove 13. The stop ring 17 is kept in place by a snap ring 18 housed in a circumferential recess 19 in the wall externally delimiting the groove 16. In this way the coupling 15 is movable from a retracted position (as shown in figure 1 by the continuous line), in which its end inside the groove 13 is close to the bottom of the latter, to a partially extracted position (shown by the dotted line in figure 1), in which the internal end of the coupling rests, by a ledge 20 provided thereon, against the protruding edge of the ring 17. The portion 21 of the coupling 15, protruding from the head 11, is (as can be clearly seen in figure 2) externally shaped like a prism with a substantially hexagonal base, while internally it is threaded. In order to ensure the seal between the external wall of the tubular end 14 and corresponding internal wall of the coupling 15, the latter is provided with an O-ring 22 housed in an appropriate recess 23. As can be seen in figure 2, the head 11 is perforated between two opposing walls, as generically indicated by reference 28, in order to constitute an extension of holes made in the open ends 26, 27 of the ring 17. Said holes are penetrated by a screw whose axis thus lies substantially tangent to the median circumference of the ring 17. Said screw is threaded only on one end portion 25, so as to engage only with the matching threaded hole, in the end 26 of the ring, opposite the head of the screw 24. The perforations 28 in the body 11 and the hole on the end 27 are larger in diameter than the external diameter of the threaded portion 25 so that the latter can be inserted through them without engaging. The above-described connector operates as follows. The threaded end of the coupling 15 is screwed onto the correspondingly threaded end of a pipe that is to be fitted onto the device of which the connector 10 forms an integral part. Screwing the pipe and the device together without rotating them is made possible by the freedom of rotation of the coupling 15 in the groove 13 and facilitated by the hexagonal shape of the coupling which enables it to be turned with a suitable wrench. Thanks to the invention, the length of the pipe can take advantage of a certain tolerance: it is sufficient to ensure that the end to be fitted is in a position ranging from the immediate vicinity of the free end of the coupling 15 when it is in the retracted position, to the position assumed by said free end of the coupling in the extracted position minus the length of thread considered necessary for securing the connection. During the screwing the coupling 15 moves axially towards the outside of the groove 13 compensating the relative axial movements due to the screwing action and thus making it possible neither to move the device of which the head 11 forms part, nor the pipe. On completion of the screwing, in order to prevent any possible relative movements between the pipe and the device, it is sufficient to tighten the screw 24 so as to force the stop ring 17 against the external wall of the coupling 15 thereby locking it and preventing any possible rotational or translatory movement due to friction. The head 11, represented as being parallelepipedon in shape, can be of any other shape (for example, cylindrical according to an axis parallel to the extension of the conduit 12). Likewise, the system for preventing movement once a pipe has been screwed onto the connector can be modified with respect to the one shown in the drawings, by inserting surfaces for preventing rotation of the ring in order to prevent any possible undesirable slipping of the latter on the securing screw, or by using other known techniques for tightening the ring on the coupling. Lastly, the coupling can, if necessary, be threaded externally instead of internally and, moreover, the surface by which it is gripped in order to screw it on can, instead of hexagonal or more generically polygonal, be of any known shape suitable for the purpose, such as for example, simply knurled.

Claims: A connector (10) for devices designed to be fitted onto conduits in a pressurized fluid system, including an element (15) to be screwed to a complementary conduit mouthpiece, characterized by the fact that said element comprises a first end (21) threaded to be screwed to the complementary mouthpiece and a cylindrical portion at opposite second end which is fitted in an axially and rotatably movable way in complementary housing (13) in the device and in airtight therewith, clasping means (17) being provided in the body of the device to clasp around said element (15) in order to prevent the movement of said element (15) once it has been fitted onto the mouthpiece. A connector as claimed in claim 1, characterized by the fact that said clasping means (17) comprise a stop ring (17) which can be radially fastened over said element (15). A connector as claimed in claim 2, characterized by the fact that the stop ring (17) is provided with a cut along one radius, and that the two opposing egdes (26, 27), defined by such cut, can be compressed towards each other by means of a screw (24) to form said radial fastening. A connector as claimed in claim 1, characterized by the fact that an O-ring (22) is disposed between the cylindrical portion of the element (15) and the complementary housing (13). A connector as claimed in claim 2, characterized by the fact that said stop ring (17) also engages with a ledge (20) extending towards the outside of the element (15) in order to prevent it from slipping out completely from the complementary housing (13). A connector as claimed in claim 2, characterized by the fact that the stop ring (17) is secured to the device by its insertion in a housing (16) in the latter and prevented from slipping out of said housing (16) by means of a snap ring (18) with it outer edge partially inserted into a groove (19) made around the mouth of said housing (16). A connector as claimed in claim 1, characterized by the fact that the element (15) is provided with a polygonal-shaped external gripping portion (21).

Inventors: RODELLA, FAUSTO
Applicants: METAL WORK S.P.A.
Application year: 1989
Main classification: F16L27
IPC codes: F16L25