METAL PIPE WITH A PLASTIC COATING IN COMBINATION WITH A PARTICULARLY QUICK CONNECTOR.

Description

'Provincial Office of Industry DB, COMMERCE and deli.'akubimato 2 3 DEC. 1996 SAVONA <V9 fib'O 0 0 0 1 1 DESCRIPTION of the industrial utility model from the ti tolo "Metal tube provided with a coating of material plastic in combination with a fitting, in particular "quick lare" of the company BUNDY SpA, of Italian nationality, with headquarters in 16012 Busalla (GE), Via Pinan 2. Filed on 2 3 DEC. 1996 No. DESCRIPTION TEXT The present invention relates to a metal tube thallic provided with plastic coating in combination with a fitting, especially a quick fit do, which tube is intended in particular to con- 15 produce a fluid, liquid or gaseous, which exerts a solvent or disintegrating action on the plastic coating. In particular, the finding refers to pipes metal in combination with quick couplings 20 part of the fuel supply system, such as gasoline and the like, to an internal combustion engine. In general, the invention concerns a metal tube provided with a plastic coating and a fitting, especially a quick-fitting one. PROVINCIAL OFFICE OF INDUSTRY, COMMERCE AND ARMY SAVONA 2 3 D1C.1996 Giorgia4ÒKapdghìosoff Maq^awtóAbilrtato Registered AJT531 BM 9 6V0 0 0 0 1 1 do, for the connection of the said tube to any glia duct, so-called attack, which can be consisting in turn of any rigid tube or flexible or from an inlet or outlet or from a ducts made part of any device whatsoever- I want, and which connection quick includes a body connecting cable connected or connectable with the overlay- said attack duct and containing at least one annular seal that delimits a compartment communicating with the connection duct and through which the end of the metal tube covered with plastic material can be sealed, in such a way that the terminal part of its free end is located in the said compartment of the connection body. 15 So far, in quick couplings of this type, the metal tube that could be inserted into the connecting body was provided with a plastic coating along its entire terminal section up to at its free end or was it completely 20 without coating as in the case of stainless steel pipes. The invention is based on the recognition that in the quick couplings of the above-mentioned type the metal tube protrudes with its terminal part covered with plastic material beyond the annular gasket and this PROVINCIAL OFFICE OF INDUSTRY, COMMERCE AND ART I CIANATO SAVONA Giorzfi Registered ghiosoff listing No. 531 BM protruding end part of the end of the tube yes It is located in the space of the connecting body which communicates with the pipe and is therefore filled with the fluid which flows in the pipe itself and through the connecting body. Consequently 5 consequence, and in particular in the case of fluids that they exert a solvent or disintegrating action on the reve- THE DIRECTOR / fdr $•. 2>t2>onafn? estimate connection of plastic material of the tube inserted into the rapid, the said fluid can determine the detachment of fragments of the material covering __ 10 plastic from the said part of the tube protruding beyond the gasket of the quick coupling. These detached fragments 5'^0^ ì ^enter the fluid circuit and can ' *' 1 .< <• • ' ' > / -V ' ^^^'fv^ / to cause inconveniences, such as for example the occlusion of the injectors when the fluid that 15 flows in the tube is made of fuel, in par particular from petrol, diesel or similar, powered by an internal combustion engine. The invention aims to eliminate the above mentioned in convenient and provides for this purpose that the metal tube with plastic coating is free of such coating at least in correspondence with the terminal section of its end intended to be inserted into the quick coupling, which section protrudes into the space of the coupling body beyond the annular gasket of the coupling itself. PROVINCIAL OFFICE OF INDUSTRI» nfi. commerce E DELW.iwiure 2 3 DEC. 1996 yffife' SAVONA written^^31BM 5v9 HIS 0 0 0 1 1 Advantageously this tube is provided with a certain distance from its free end and outside the annular seal of an annular retaining boss which engages, in the position of the tube inserted into the fitting body, preferably automatically with locking means which are & penata) connected to the connecting body and prevent the involuntary extraction of the tube from the body of the collector cord itself. According to an embodiment of the invention, the exposed terminal section, i.e. without plastic coating, of the end of the metal tube intended to be inserted into the quick coupling, can extend backwards also in correspondence with the annular gasket and also up to any point beyond the annular gasket, possibly up to the annular retaining projection of the pipe, and may also include the annular retaining projection of the pipe, that is, it may also extend in correspondence with such annular retaining projection and even for a certain length beyond it. The uncovered section, i.e. without plastic coating, of the metal tube for quick couplings according to the invention can be obtained in any suitable way, for example by eliminating PROVINCIAL OFFICE OF INDUSTRY OF. COMMERCE AND INDUSTRY 3 0 / C. SAVONA written 531 BM >9 6vO 0 0 0 1 1 nation of the respective cladding part, in particular by mechanical peeling or by chemical removal, after applying the coating chin of 5 by means process plastic material to the metal tube, or any suitable precaution during the of application of the material coating DiREnORB plastic, for example by blowing or otherwise Obviously in this last case we obtain from the peelings with not completely clear edges, without but undermine the effectiveness of the combination according to the finding. An executive example of the tube combination and of the quick coupling according to the invention will be de- written following with reference to the attached drawing- to, in Which: There 1 illustrates schematically in section longitudinal a metal tube with a coating in plastic material according to the invention in combination with a quick coupling. Fig. 2 shows a view of the end of the tube metal with coating stica and destined to be grafted pido. With reference to the drawing, illustrated is intended to achieve of pla material in the ra junction quick connection the connection SV'S 6J0 0 0 0 1 1 between a metal tube 1 provided with a coating external 2 of plastic material, and a duct so said connection (not illustrated) which can be made up of any other tube, rigid or flexible, or by a duct provided in any device glia. The metal tube 1 can be made up of a any type of tube, and can to be in particular- king a tube of the so-called type BUNDY that is, obtained ilitato . 531 BM by double-wrapping a steel strip, copper-plated on one or both sides, and then brazing the two walls together. In particular, the metal tube 1 may have its external surface covered with a metallic coating such as zinc or aluminum or other. The rivet The plastic casing 2 of the metal tube 1 may be made of any suitable type of plastic material, for example epoxy, polyamide or other plastic material. 20 The metal tube 1 has a free end slightly rounded and is provided, at a certain distance from its free end, with an external annular retaining protrusion 3 in the form of a flange. seen from ^^^^^finish OEU-'INW™ PROVINCIAL OFFICE 1 K1 TRADE AND THE OEU'*R'« ro 2 3 DEC. 1996 SAVONA SV9 6bÒ 0 0 0 1 1 The quick coupling has a socket-shaped connection body 4 which widens in steps from its end 104 connected or connectable to the above-mentioned connection pipe (not illustrated), towards its opposite end, illustrated on the right in fig. 1 and into which the metal tube 1 is inserted with a plastic coating 2, to de-connect it with the connection pipe. The connection body 4 houses an annular gasket 10, made up of two O-rings 5, 6 and an interposed spacer ring 7. This annular gasket is provided between an internal annular step of the body TO THE of connection 4 and a positioning sleeve 8 al-\'Vóiy also housed in the connecting body 4 and held in the same by a terminal ring 9 which is inserted into the wider end of the connecting body 4. The wider end of the connecting body 4 is integral, by means of a cage 10 or by means of longitudinal extensions 20, with an external support ring 11 which is located at a certain distance from the connecting body 4 coaxially with it. The elements 4, 10, 11 are preferably made of one piece. A funnel-shaped locking element 12 which tapers is connected to said support ring 11. TEST OFFICE! AIE OF THE INDUS! NA OF COMMERCE AND OF THE ARilolANAW SAVONA $V9 6tb OOO 1 1 towards the connecting body 4 and ends from the same or from the terminal ring 9 at a substantial distance equal to the thickness, in the axial direction, of the external annular retaining ring 3 of the metal tube 5 lico 1. The wider end of the funnel element locking forms 12 is provided with a groove external ring 112, in which the ring engages . of support 11. The opening of the opposite end, X the RECTOR far 7. SM I- narrower, of the funnel-shaped locking element 12 is smaller than the radial extension of the external annular retaining relief 3 of the tube 1. The narrower end of the funnel-shaped locking element 12, facing the connection body 4, can be elastically widened in such a way as to allow the external annular retaining element 3 of the tube 1 to pass through. To this end / 1 1» f'i For this purpose, the funnel-shaped locking element 12 may be made of a suitable elastically extensible material and / or may be divided - at least at its narrower end - into 20 individual sectors or tabs, elastically spreadable. The metal tube 1 provided with the plastic coating 2 is simply inserted with its free end into the above-described quick coupling, with a corresponding axial movement 1C ,, rl(1 PROVINCIAL OF^^h- Kfi» * °eli—0 a ° SHO«' 7 3 Die, 199« . . Iscrino / àfN. 5V96J0 0 0 0 1 1 J and so as to make its annular retaining projection 3 pass completely through the funnel-shaped locking element 12, thanks to a corresponding temporary elastic widening of the narrower end of the same. In the engaged position of the tube 1, illustrated in fig. 1, the annular retaining projection 3 rests against the terminal ring 9 of the quick coupling and is blocked on the same by means of the funnel-shaped locking element 12 which, elastically narrowing after the passage of said annular retaining projection 3, points against it and prevents its return and therefore the disengagement of the tube 1 from the connection body 4. At the same time, the end of the tube 1 extending beyond the annular retaining projection 3, passes through the positioning sleeve 8 and through the annular gasket 5, 6, 7 and comes to protrude with its terminal part beyond this gasket into the compartment 204 of the connection body 4.This compartment 204 of the connecting body 4 is filled with the fluid that flows in the pipe 1 and is made up for example of a liquid fuel, such as petrol or diesel, since the said compartment 204 communicates freely both with the end outlet of the pipe 1 itself and with the connection duct (not the-. PROVINCIAL OFFICE OF INDUSTRY OF THE COMMEP r iQ AND OF THE ARI I6IANAT0 SAVONA (polished) connected or connectable with the end 104 Giorgi Ma Member hiosoff ilitato 1BM of the connecting body 4. Quick couplings of the type described above are known in the most varied executive and constructive forms 5 are functionally equivalent and are manufactured produced and marketed, for example, by companies 4 THE DIRECTOR / . a: «M and HURON, JOHN GUEST, and RAYMOND. These quick-release couplings they can be made of plastic, as in the to) ^owx-illustrated case, in which the connecting body 4 is re- plastic material in one piece with the ring of I support 11 and with the respective colleague cage chin 10. Also the funnel-shaped locking element 12, the terminal ring 9, the positioning sleeve intermediate spacer 7 can be facts body Of Of perspective facts of plastic material. On the other hand, at least the fitting 4, the support ring 11 and the re- cage metal 12 can lock of connection 10 can be and of piece. Also the element of to be made of metal and can be constituted then for example, from a crown of appropriately fitted fins profiled and elastic divariable in direction radial. In principle cipio, this element of blocking can take the more varied constructional executive forms as well very different from each other, but having a functioning 2 3 DEC, 1996 ,r PROVINCIAL OFFICE OF INDUSTRY Giom^faraghiosoff OF COMMERCE*' AND OF THE ARIBLANATO isenfaSS^tBM s A v ° “ M 6$ 0 0 0 1 1 / with an anti-return lock equivalent to that of the above-described funnel-shaped locking element 12. The above-described quick connection, as well as the other known quick couplings of equivalent type, pre- 5 feel the inconvenience that when the fluid passes it exerts a solvent action through the connection or disintegrating on the coating of the metal tube 1, it can «r of little pieces of the covering 2 of plastic material cause detachment 2 of plastic material from that terminal part of the tube, which protrudes into the compartment 204 of the connection body 4 and is therefore in contact with the fluid. These small pieces detached from the plastic coating 2 enter the fluid circuit and can cause problems. 15 nothing, for example when the fluid is made up of liquid fuel, such as gasoline, gasoline, or similar them, fed by means of the quick coupling and the attached connection pipe to the injector group of an internal combustion engine. 20 The above mentioned inconvenience is eliminated by the present invention with the fact that at least the terminal section of the free end of the tube 1, which section protrudes beyond the gasket 5, 6, 7, i.e. beyond the innermost O-ring 5 of this gasket, in the 25 compartment 204 of the connecting body 4, is exposed, i.e. 2 3 DtC. PROVINCIAL OFFICE OF INDUSTRY n E TRADE AND THE ARI CANAIO SAVONA ^9 61)0 0 0 0 1 1 without plastic coating 2. In this case in this case, therefore, the pla material coating 2 tube 1 it extends only up to that circumference of tube 1, in correspondence with the 5 which is achieved - by the gasket ring 5, 6, 7 - sealing of compartment 204 of the connecting body 4, that is, in the case illustrated, only up to that circumference of the pipe 1, at which the seal is created around tube 1 to work of the innermost O-ring 5 or up to The trait circumference little beyond or shortly before the said as indicated with lines uncovered, that is, devoid of of plastic material, corresponding at times in the coating 2 of the extremity free .of the tube 1 inserted into the connection body 4, It can, however, extend from the free end of the said tube backwards, i.e. towards the annular retaining projection 3, even to a greater extent than indicated above, i.e. up to any point between the said annular retaining relief 3 and the innermost sealing circumference around the pipe 1 by the annular gasket 5, 6, 7, i.e. up to any point between the annular retaining relief 25 3 and the sealing circumference of the innermost O-ring Giorgio Man Member Ghiosoff ilitato .531 BM .. . PROVINCIAL OFFICE OF INDUSTRY OF THE CLERK AND THE ANIMATED SAVONA 2 3 Die. 1996 W9 6U0 0 0 0 1 1 no. 5 of the said gasket, for example up to any point corresponding to the axial extension of the annular gasket 5, 6, 7 or up to any point between this annular gasket 5, 6, 7 and the annular retaining flange 3. This last case is illustrated with solid lines in fig. 1, in which the plastic coating 2 of the metal tube 1 extends beyond the annular retaining flange 3 towards the free end of the tube 1 up to a point corresponding to the handle. cooked positioner 8. This embodiment is also indicated with dash and dot lines in fig. 2. i II plastic coating 2 can however ^.'!>7=^ send even before the annular retaining ridge W'b / rl'5>x 3, with reference to the direction towards the end « • free of the tube, in contact with the said annular projection of retaining 3 or at a certain distance from it, as illustrated with solid lines in fig. 2. Of course, the metal tube with coating 20 of plastic material according to the invention and the quick coupling can be applied in all cases in which such application is appropriate or desired. A possible application could be, for example, that of the petrol pipes provided in the 25 cars and of which a first pipe leads gasoline from the tank to the car engine (delivery pipe), and a second pipe allows the reverse flow (return pipe), while a third pipe connects the tank to the activated carbon filters (gasoline vapor pipe). Each or at least one of these pipes may comprise a section consisting of a rigid metal tube 1 provided with a plastic coating 2 (as described above) and connected at its ends to flexible hoses of any suitable type, for example nylon, rubber, or the like. One or both of these connections between a rigid metal tube and a flexible hose may be made using quick-release couplings and with the metal tube according to the invention. Naturally, the present invention also includes models that achieve equal utility, using the same inventive concept claimed below. pr.nn PROVINCIAL OF INDUSTRY dFF1C ..CQ r,n F dEU ARUB'WM 0 TRADE t bumps U SAVONA $V9 6V0 0 0 0 1 1 PROVINCIAL OFFICE OF INDUSTRY OEI COMMERCE AND OF THE ARII6IAN AIO SAVONA Giorgio Man Member Ighiosoff biiìtato . 531 BM et / °000;

Claims

CLAIMS H 2 3 DEC. 1996 1. Metal tube provided with a coating of plastic material and intended in particular for con duce of the fluids, liquid or gaseous, which they exercise 5 a dissolving or disintegrating action on the plastic coating and consist especially of liquid fuels, such as petrol, gasoline and the like, in combination with fittings, in particular ra pidi, being said quick coupling usable - 10 in particular in pipes forming part of the '.si, .<!?X supply system of internal combustion engines, for example in cars - to connect said pipe & -ir:. a .^bimetallic with any so-called Vl-Sid connection duct which can in turn consist of a 15 rigid or flexible tube or a hole or conduit provided in any device, and which quick coupling comprises a hollow coupling body, connected or connectable with said coupling conduit and containing at least one annular gasket which 20 has a compartment communicating with the connection duct, and through which the annular gasket can be inserted hermetically, the end of the metal tube covered with plastic material, so that the end of the its grafted end is placed in the said 25 compartment of the connecting body, characterized by the fact PROVINCIAL OFFICE OF INDUSTRY - . OF COMMERCE AND AIR I6IANAT0 2 to Die. 1996 SAVONA that the metal tube is free of ma coating plastic material at least in that portion of its free end intended to be engaged in the fitting body, which portion protrudes, when the pipe is engaged in the fitting body, beyond the annular gasket in the attachment of the fitting body same.

2. Metal tube in combination with fitting according to claim 1, wherein at a certain distance from its free end, the pipe is provided with an external annular retaining projection which engages, in the position of the pipe engaged in the fitting body, preferably automatically with means of clamps which are connected to the fitting body and prevent the pipe from being unintentionally pulled out of the fitting body, 3. metal tube in combination with fitting in particular rapid according to claim 1 o 2, characterized by the fact that the uncovered stretch, 20 i.e. without coating of plastic material, of the metal tube extends from the free end of this tube backwards to a circumference or circumferential area of ​​the tube, in correspondence of which the tightness is determined by the PROVINCE OFFICE! And PPE. THE INDUSTRY. OF THE. TRADE t OHI 'Ali) is W1MI0 SAVONA 2 3 DEC. 1996 6t^) 0 0 0 1 1 annular seal, or up to shortly before or shortly after that circumference or circumferential area.

4. Metal pipe in combination with a particularly quick coupling according to claim 1, 5 characterized in that the exposed section, i.e. without plastic material coating, of the metal pipe extends from the free end of this pipe back to anywhere between the annular gasket (or a circumference or circum- 10 conference tube, at which the seal is determined by the gasket - THE OI5ETTOM ne ring finger itself) and » 9. tube. the annular retaining boss 5. Metal tube in combination with fitting 15 in particular rapid according to claim 1, ^'X^characterized by the fact that the uncovered section, i.e. The plastic coating element of the tube also includes the annular retaining boss of said tube. 20 6. Metal pipe in combination with fitting, in particular rapid according to claim 1, characterized by the fact that the uncovered section, i.e. without coating of plastic material, of the metal tube extends from the free end of this tube 25 back beyond the annular retaining projection fi up to directly after this highlight or up to a certain distance from it.

7. Metal pipe in combination with fitting, especially quick according to any of the 5 preceding claims, characterized by the fact that the uncovered portion, i.e. without plastic material coating, of the metal pipe is obtained by mechanical or chemical elimination of the coating ment after the application of the same or at the 10 to of coating application.

8. Metal pipe provided with plastic coating, in combination with fittings, in particularly fast, substantially as described, illustrated and for the above purposes. D?. / 6lORGtO A. kaF ^.. t , T „ AUTHORIZED AGENT REGISTERED under No. 531 / BM PROVINCIAL OFFICE OF INDUSTRY DE!. TRADE AND CRAFTS SAVONA £ V9 6lì 0 0 0 1 1 1 3 DEC. 1996