FLEXIBLE HOSE

Abstract: Flexible hose (1) with a fitting ring nut, (15 + 21) threaded on the hose itself and equipped with a stopping ring (23) against an outside enlargement (7) of the corresponding hose end, the other end being equipped with an outside thread, and both said ends being rigid and inside with constant diameter, and said ring nut (15) being preferably double, i.e. comprising a regulating ring nut (21) and an interchangeable locking ring nut (28).

Description: Flcxible Nose The invention refers to a flexible hose and more exactly to a flexible hose which can be easily connected with another hose or with a .pump for its suction or delivery or with another part, as e. g. a foot valve. In order to accomplish said connections, union fittings are normally used. These consist of two elements, a female one and a male one, respectively associated with the two parts to be connected. The female part generally includes a ring nut and a tubular element, the latter being furnished on the outer surface towards one end with an annular enlargement, while the other end is connected t one of the two parts to be fitted together and in the case of a flexible hose it is threaded inside one end of it and is fastened to it by hose clamps, and the ring nut having the inside diameter bigger than the diameter of the tubular element but not of its annular enlarge ment, having therefore to be threaded on the tubular element before introducing its end into the flexible hose end, and being equipped with stopping ring against the circular crown which delimits said enlargement towards the hose and which also prevents the ring nut from coming out of the female fitting, and with a threading suited to screw it with the threaded end of the tubular element of the male part of the fitting which is joint at its other erid to the the part to be assembled. The terminal parts facing one another in the fitting of the two tubular elements, that is the flat surfaces of the circular crowns corresponding to their thickness which delimit axially such elements, are the sealing surfaces of the fitting and a gasket is usually interposed between them in order to improve the seal, the tightening being accomplished through the screwing of the ring nut which pushes the two surfaces one against the other. Normally a flexible hose is equipped at one of its ends with the fe male part of an union fitting and at the other end with the male part of another union fitting. There are also quick connection union fittings wherein the ring nut and the tubular element of the male part are equipped, instead of a connection threading, with other devices suited to allow their quick connection, as in the bayonet type. There are also more corn plex types of these quick connection fittings, which are provided with double ring nuts, as they have in fact two ring nuts which can be reciprocally screwed, the outer one of which, hereinafter called locking nut, is equipped with the connection devices, and the inner one, hereinafter called regulating rinp nut., is provided with the stopping ring on the annular enlargement of the tubular element of the female part, so that by additionally screwing the inner ring nut with the outer one after the last said has been con nected to the corresponding ring nut of the other part to be assem bled, the connection strength of the sealing surfaces can be inure¯ sed and so regulated. The drawback of the flexible hoses which can be connected with union fittings of any type essentially consists in the higher cost of the hose which must be used, compared with the cost of the hose which it would be sufficient to use for the contrmpiated requirements of use, should there be no inside throttling of the tubular element of the fitting. The aim of the invention is to eliminate this drawback. The flexible hose which can be connected with other parts in confor mity with the present invention includes a fitting ring nut which is threaded on the hose itself, equipped with stopping ring, and the hose ends are rigid and shaped: the one end which may be connec ted with said ring nut having an outside cylindrical enlargement which circular crown opposite to the hose end forms the counter stop ping ring of such ring nut, and the other end having an outside thread and possibly an annular enlargement to limit the advancing of the ring nut of the female fitting of the part to be connected with such flexible hose end, the inside diameter of the hose being constant also in said rigid hose ends. In an improvement the ring nut is double, that is it includes a regulating ring and one or more, each other interchangeable, lo cking nuts, the smaller inside diameter of the last said being any way bigger than the maximum outside diameter of the annular en largement which forms the counter stopping ring of the regulating ring nut, and such locking nuts being therefore unthreadable from the hose, moreover each one of such locking nuts being equipped with connecting devices different one from the other in order to connect the corresponding hose end with parts having fittings of different type. In a further improvement the outside surface of the final part of the annular enlargement of the hose connectable with the ring nut has sections having a diameter different one from the other and the hose includes a cylindrical gasket having more inside diameters and which is suitable to be fitted through elastic deformation on the end part of the cylindrical enlargement rounding it, the diameters of the various parts in touch with the enlargement and with the gasket after the assemblage being such that the last said stays firm i ly attached to the enlargement. making, therefore the handling of the hose easier when assembling it to other parts avoiding said gasket to fall or sit in a wrong way. It is evident from the description which has been made that the flexible hose in conformity with the invention is particularly sui ted to be also entirely accomplished with plastics even if of seve ral types, by using techniques well known to the prior art, hence with low production costs, thus improving the saving achieved through the use of hoses having a diameter smaller than the diameter requi red up to now for the same requirements of use. One way of carrying out the invention is described in detail below with reference to drawings which illustrate only one specific embodi ment, in which figures 1 and 2 are partially cross-section side views. The flexible hose 1 is a plastic hose having in its thickness a stiffe ning spiral, also made of plastic material. The terminal rigid parts 3 and 4 of the hose have two inside diameters, of which the one of the sections 5 and 6 is equal to the inside diameter of hose 1; whi le the inside diameter of the sections 7 and 8 is equal to the outside diameter of the remaining hose, which said parts have been permanently connected with during manufacturing according to the cylindrical surfaces 7a and 8a and the flat surfaces of the circular crowns 9 and 10. The free end 11 of part 5 has an outside surface having a dia meter which is smaller than the diameter of the remaining part and is equipped with a circular groove 12 having square section suited to receive the flange of the elastic cylindrical gasket 14 in order to fasten the latter after assembly through elastic deformation to the end 11. The locking ring nut 15 is of the bayonet connection type and is therefore equipped with the two enlargements for outside attachment 16 and 17 and with the two peripherical enlargements 18 and 19, the figure showing only the enlargement 18, intended to fasten themselves through penetration and rotation to the correspon ding parts of the ring nut of the part to which said end Cf the flexible hose 1 must be connected. The inside dimensions of the ring nut 15 are such as to allow its free threading on and unthreading from hose 1. In the part towards the last said the ring nut 15 is equipped with threading 20 suited to allow it to be screwed with the regula ting ring nut 21 in correspondence to the threaded part 22 of it. Slid ring nut 21 is equipped with the s@opping rinp frrneI by the surface of the circulr crown 23 of the annular enlargement 24 @o wards the inside, the counter stopping ring consisting of the sur face of the circular crowns 25 delimitating the part 3, Said ring nut 21, having free rotation and translation with respect to the flexible hose but not unthreadable out of it, is equipped, in addition, with knurling 21a on the outside surface, so that it can more easily be screwed even by hand, in order to finally lock the fitting after assembly of the ring nut 15 with the homologous element of the part, whereto this hose end must be connected. The terminal rigid part 4 of the other end of the hose 1 is equipped outside with an annular and enlargement 222with hexagonal facets 27a for the screwing of said end equipped with threading 26 with possible aid of keys to the ring nut of the part which it must be connected to. The flexible hose of the example is also equipped with a second locking nut 28 for connection with parts equipped with screw fittings equal to the part 4 of the hose 1. Said ring nut 28 can replace the ring nut 15 as it is equipped with inside threading 29 equal to the one 20 of the ring nut 15 and therefore suited to screw itself to the threa ded part 22 of the regulating ring nut 21 in order to be connected to the last said, and is equipped in addition with the inside threa ding 30 in the terminal part to allow its connection by screwing with a part equipped with @erminal threaded tubular element as the 26 of the part 4, and in addition with the circular groove 31 suited to receive the elastic gasket. 32 llavillg circular section to form a second seal area of the connection between the circular crown 33 of the head of the ring nut 28 and the annular disk corresponding to the disk 34 of the part 4. Said ring nut is provided outside with knurling 35 as well as with hexagonal facets 36 for its screwing by hand or by means of a key. Of course the dimensions of the parts intended to be connected and the types of threading correspond to the standard requirements, the diameter and length of the hose being selected according to the re quirements of the use which is contemp#ated.

Claims: Claims: 1. Flexible hose which can be connected with other parts characte terized in that it includes a fitting ring nut (15 + 21) threaded on the hose itself, said fitting ring nut being equipped with a stop ping ring (23), and in that the hose ends are rigid and shaped: the one end (3) which may be connected with said ring nut having an outside cylindrical enlargement (7), whose circular crown (25) opposite to the hose end forms the counter stopping ring of such ring nut and the other end (4) having an outside thread (26) and possibly an annular enlargement (27) to limit the advancing of the nut of the female fitting of the part to be connected with such fle xible hose end, he inside diameter of tlre hose being constant also in said rigid hose ends. 2. Hose as claimed in claim 1 characterized in that the ring nut is double, that is it includes a regulating ring nut (21) and one or more each other interchangeable locking ring nuts (15, 28), the smaller inside diameter of the last said being anyway bigger than the maximum outside diameter of the annular enlargement (7) which forms the counter stopping ring (25) of the regulating nut (21) and such locking nuts (15) being therefore unthreadable from the hose (1), moreover each one of such locking nuts (15) being equip ped with attachment devices(16, 17, 18, 19 or 30) different one from the other in order to allow connecting of the corresponding flexible hose end with parts having different fittings. 3. Hose as claimed in claims 1 and 2 characterized in that the out side surface of the final part of the annular enlargement (7) of the hose end (3) connectable with the ring nut has sections having diameters different one from the other, and in that the hose (1) includes a cylindrical gasket (14) having more inside diameters sui table to be fitted through elastic deformation on the terminal part (11) of the cylindrical enlargement (7) rounding it. the diameters of the various parts in touch with the enlargement (11) and with the gasket (14) after the assembly being such that the last said (14) stays firmly attached to the enlargment (11) making therefore the handling of the hose (1) easier when assembling it to other parts avoiding said gasket (14) to fall or sit in a wrong way.

Inventors: TAMBORINI, ARIBERTO
Applicants: MERLETT TECNOPLASTIC S.P.A.
Application year: 1984
Main classification: F16L37
IPC codes: F16L37