WO2020058921A1

WO2020058921A1 - Nozzle-holder for nozzle of tanker tanks and related method of making

Info

Publication number: WO2020058921A1
Application number: PCT/IB2019/057960
Authority: WO
Inventors: Domenico LORUSSO
Original assignee: Lokhen S.R.L.
Priority date: 2018-09-20
Filing date: 2019-09-20
Publication date: 2020-03-26
Also published as: DE112019004713T5

Abstract

Nozzle-holder (4) for tanker trucks comprising: at least one cylindrical body (8) delimiting a containment volume (12) for housing a conveying tube of material from a tank, the cylindrical body extending along a main axial direction X-X from a rear end to a front end, a front body (28), fitted with a closure cap (32), associated with the front end of the cylindrical body (8), the front body (28) comprising a front wall (36) suitable to receive in abutment a nozzle (40) of said output tube. The front body (28) comprises, on a rear side (48), facing said containment volume (12), an inner guide wall (52), which extends around the inner perimeter of the cylindrical body (8) so as to identify an annular seat housing a sealing gasket (60). The annular seat at least partially houses the front end of the cylindrical body; the gasket is interposed, between the annular seat and the front end of the cylindrical body.

Description

DESCRIPTION

"NOZZLE -HOLDER FOR NOZZLE OF TANKER TANKS AND RELATED

ME THOD OF MAKING"

FIELD OF APPLICATION

[0001] The present invention relates to a nozzle-holder for nozzle of tanker truck and related method of making.

PRIOR ART

[0002] As is known, in the field of tanker trucks, the tank which can contain material both in liquid and solid (typically granular) form which must be discharged if necessary through the use of a tube, typically corrugated which ends with a nozzle. The nozzle is contained, together with the corrugated tube, in a nozzle-holder usually located in a horizontal and lateral position along the longitudinal axis of the tanker truck.

[0003] The nozzle-holder must allow the resolution of a plurality of technical problems.

[0004] First of all, it must be strong enough to contain the tube with the nozzle and to guide the extraction of the tube, grasped and pulled through the nozzle, by the operator .

[0005] This operation is delicate as it must be repeated several times in the same day and thousands of times in the useful life of the component.

[0006] Each time the nozzle-holder must guarantee an easy and quick extraction of the tube and also an equally easy and rapid re-insertion of the tube into the same nozzle- holder .

[0007] Moreover, during the extraction and re-insertion steps, any fall/dispersion of material contained in the tank must be prevented: this is imposed by the regulations that require not to dirty the road in any way regardless of the dangerousness of the possibly dispersed/spilled substance.

[0008] Then it is clear that, in the case of transport of hazardous materials, such as corrosive and/or flammable liquids, this requirement takes on an even more decisive value .

[0009] Furthermore, the nozzle-holder should preferably also have safety systems which prevent unauthorized access to the nozzle therein contained.

DISCLOSURE OF THE INVENTION

[0010] To solve the aforementioned problems, with particular reference to the problem of the prohibition of accidental spillage of material, to date some solutions have been adopted in the art that do not guarantee the seal over time.

[0011] Therefore, in the known solutions, when the nozzle is stored in its seat, possible leaks cannot be excluded.

[0012] The need to solve the drawbacks and limitations mentioned with reference to the prior art is therefore felt .

[0013] Such a need is met by a nozzle-holder according to claim 1.

DESCRIPTION OF THE DRAWINGS

[0014] Further features and advantages of the present invention will appear more clearly from the following description of preferred non-limiting embodiments thereof, in which:

[0015] figures la-lb show perspective views from different angles of a single-type nozzle-holder according to an embodiment of the present invention;

[0016] figures 2a, 2b, 2c are respectively a sectional view, a lateral view and a plan view from above of the nozzle-holder of figures la-lb;

[0017] figures 3a-3b show views of the enlarged details Ilia and Illb of the rear and front ends, respectively, of the nozzle-holder of figures la-lb;

[0018] figure 4 shows a perspective view in an assembled and exploded configuration of the front end of the nozzle-holder of figures la-lb;

[0019] figure 5 shows a front view of the front end of figure 4;

[0020] figure 6 shows a sectional view of the front end of figure 5, along the section plane VI-VI indicated in figure 5;

[0021] figure 7 shows the enlarged detail VII indicated in figure 6;

[0022] figure 8 shows a perspective view in an assembled and exploded configuration of the rear end of the nozzle- holder of figures la-lb;

[0023] figure 9 shows a front view of the rear end of figure 8;

[0024] figure 10 shows a sectional view of the rear end of figure 9, along the section plane X-X indicated in figure

9;

[0025] figure 11 shows the enlarged detail XI indicated in figure 10;

[0026] figures 12a-12b show perspective views from different angles of a dual-type nozzle-holder according to a second embodiment of the present invention;

[0027] figures 13a, 13b, 13c show a plan bottom view, a lateral view and a plan top view, respectively, of the nozzle-holder of figures 12a-12b;

[0028] figures 14a-14b show front views of the front and rear ends of the nozzle-holder of figures 12a-12b;

[0029] figure 15 shows a perspective view in an assembled and exploded configuration of the front end of the nozzle-holder of figures 12a-12b;

[0030] figure 16 shows a front view of the front end of figure 15;

[0031] figure 17 shows a sectional view of the front end of figure 16, along the section plane XVI I-XVI I indicated in figure 16;

[0032] figure 18 shows the enlarged detail XVIII indicated in figure 17;

[0033] figure 19 shows a perspective view in an assembled and exploded configuration of the rear end of the nozzle- holder of figures 12a-12b;

[0034] figure 20 shows a front view of the rear end of figure 19;

[0035] figure 21 shows a sectional view of the rear end of figure 20, along the section plane XXI-XXI indicated in figure 20;

[0036] figure 22 shows the enlarged detail XXII indicated in figure 21;

[0037] figures 23a-23b show perspective views from different angles of a triple-type nozzle-holder according to a third embodiment of the present invention;

[0038] figures 24a, 24b, 24c show a plan bottom view, a lateral view and a plan top view, respectively, of the nozzle-holder of figures 23a-23b;

[0039] figures 25a-25b show front views of the front and rear ends of the nozzle-holder of figures 23a-23b;

[0040] figure 26 shows a perspective view in an assembled and exploded configuration of the front end of the nozzle-holder of figures 23a-23b;

[0041] figure 27 shows a front view of the front end of figure 26;

[0042] figure 28 shows a sectional view of the front end of figure 27, along the section plane XXVIII-XXVIII indicated in figure 27;

[0043] figure 29 shows the enlarged detail XXIX indicated in figure 28;

[0044] figure 30 shows a perspective view in an assembled and exploded configuration of the rear end of the nozzle- holder of figures 23a-23b;

[0045] figure 31 shows a front view of the rear end of figure 30;

[0046] figure 32 shows a sectional view of the rear end of figure 31, along the section plane XXXI I-XXXI I indicated in figure 31;

[0047] figure 33 shows the enlarged detail XXXIII indicated in figure 32;

[0048] figure 34 shows two perspective views, from different angles, of a nozzle-holder according to a further embodiment of the present invention;

[0049] figure 35 shows a perspective view of an output tube, provided with a corresponding nozzle, of the prior art; [0050] figure 36 shows a perspective view of a tanker truck equipped with a pair of nozzle-holders.

[0051] Elements or parts of elements in common to the embodiments described below are referred to with the same reference numerals.

DETAILED DESCRIPTION

[0052] With reference to the above figures, reference numeral 4 globally indicates an overall schematic view of a nozzle-holder according to the present invention.

[0053] As mentioned above, the nozzle-holder 4 is suitable for being associated with a tanker truck (not shown) to allow the emptying thereof through a special emptying tube .

[0054] The nozzle-holder 4 comprises at least one hollow cylindrical body 8, which delimits a containment volume 12 suitable for housing an output tube 16 of the material coming from the tank.

[0055] The output tube 16 is typically a corrugated tube, so that it can be bent and moved easily by the operator if necessary; the output tube 16 may be made of polymeric material and the like. The output tube 16 may also be smooth, i.e. not corrugated.

[0056] The cylindrical body 8 extends along a main axial direction X-X from a rear end 20 to a front end 24. Typically, the cylindrical body 8 is rigid while the output tube it accommodates inside the containment volume 12 is flexible.

[0057] It should be pointed out that a cylindrical body means any body having a cylindrical configuration, i.e. having a lateral surface consisting of a bundle of straight lines parallel to a directrix. Specifically, the directrix is given by the main axial direction; therefore the cylindrical geometry includes a cylinder with a circular section but also any other section geometry which may consist, for example, of a rectangular, quadrangular, elliptical geometry, and may comprise non regular polygons.

[0058] The nozzle-holder 4 comprises a front body 28, fitted with a closure cap 32, associated with the front end 24 of the cylindrical body 8.

[0059] The closure cap 32 is typically a flap cap, preferably provided with lock means.

[0060] The front body 28 comprises a front wall 36 suitable to receive in abutment a nozzle 40 of the output tube 16, when not used and stored inside the nozzle-holder 4, in particular of the cylindrical body 8 (fig. 34) .

[0061] The front body 28 comprises a front hole 44 which is traversed by the output tube 16 and which allows it to pass through during the extraction and re-insertion steps inside the cylindrical body 8. [0062] The front body 28 comprises, on a rear side 48, facing said containment volume 12, an inner guide wall 52, which extends around the inner perimeter of the cylindrical body 8 so as to identify an annular seat 56, said annular seat 56 housing a sealing gasket 60.

[0063] According to a possible embodiment, said sealing gasket 60 is an O-ring.

[0064] Preferably, the annular seat 56 is axially symmetrical with respect to said main axial direction X-

X.

[0065] The annular seat 56 is counter-shaped with respect to a peripheral edge of the front end 24 of the cylindrical body 8.

[0066] According to an embodiment, the annular seat 56 has an axial depth 64, parallel to said main axial direction X-X, greater than an axial thickness 68 of the sealing gasket 60. This means that the sealing gasket 60 can be completely inserted and received axially in the respective annular seat 56.

[0067] According to an embodiment, the annular seat 56 has a radial depth 72, measured along a radial direction R-R perpendicular to and through said main axial direction X- X, which is less than or equal to a radial thickness 76 of the sealing gasket 60.

[0068] The annular seat 56 receives in abutment the front end 24 of the cylindrical body 8: in particular between the annular seat 56 and the front end 24 of the cylindrical body 8 there is interposed the sealing gasket 60 which is axially compressed so as to seal and prevent the accidental spillage of liquid and/or other material inside the output tube 16.

[0069] It should be noted that the inner guide wall 52 implements a guide and a centering of the front body 28 on the front end 24.

[0070] Preferably, the inner guide wall 52 has a bevelled edge 80, converging towards the containment volume 12, so as to facilitate the extraction of the output tube 16.

[0071] Moreover, the inner guide wall 52 is sized so as to constitute an extraction and re-insertion guide for said output tube 16.

[0072] Moreover, the inner guide wall 52 is dimensioned so as to have an inner diameter substantially equal to an outer diameter of the output tube 16 guided by it.

[0073] According to a possible embodiment, the inner guide wall 52 has at least one notch or interruption 84 to facilitate the drainage of any residues; preferably, said notch 84 is oriented at a lower side 88 of the inner guide wall 52 to convey any accumulated residues by gravity .

[0074] Said inner guide wall 56 may for example comprise a plurality of notches 84, for example equispaced angularly by 90 degrees, so as to have in any case a notch 84 on the lower side 88 irrespective of how the nozzle-holder 4 is mounted/oriented.

[0075] According to a possible embodiment (figure 34), a collection tank 92 is provided, fluidly connected with said at least one notch 84.

[0076] The nozzle-holder 4 further comprises a rear cap 96, associated with the rear end 20 of the cylindrical body

8.

[0077] Said rear cap 96 is in turn provided with a rear inner wall 100 which identifies a rear annular seat 104 which houses a rear gasket 108.

[0078] Preferably, the rear inner wall 100 is sized so as to constitute an extraction and re-insertion guide for said output tube 16.

[0079] The rear inner wall 100 is further sized so as to have an inner diameter substantially equal to an outer diameter of the output tube 16 guided by it.

[0080] The rear annular seat 100 is sized so as to at least partially receive the rear end 20 of the cylindrical body 8; between the rear annular seat 100 and the rear end 20 of the cylindrical body, the rear gasket 108 is axially interposed and compressed, which performs the hermetic seal, preventing the escape of liquids and/or other material .

[0081] The above description refers to a first embodiment (figures 1-11) relating to a single nozzle-holder.

[0082] The present invention also provides for a solution of double nozzle-holders (figures 12-22) .

[0083] In particular, the nozzle-holder 4 may integrally comprise a pair of cylindrical bodies 8', 8' ', parallel to one another along the main axial direction X-X, each cylindrical body 8', 8' ' housing a respective output tube 16', 16' ', and a front body 28, provided with a closure cap 32, and associated with the front end 24', 24' ' of each cylindrical body 8', 8' ' .

[0084] In other words, the front body 28 is in a single piece so as to allow and inhibit access to the respective nozzles 40', 40' with a single opening/closing operation, respectively.

[0085] In fact, the front body 28 comprises a front wall 36 suitable to receive in abutment each nozzle 40', 40' ' of a relative output tube 16', 16^{, f} . Of course, the tank may in turn be subdivided into several compartments, also not communicating with each other, so as to associate a specific and different substance/material with each nozzle 40 ' , 40 ' ' .

[0086] Preferably, the front body 28 comprises, on the rear side 48, facing said containment volume 12, a pair of inner guide walls 52', 52' ', extending around the inner perimeter of each cylindrical body 8', 8' ' so as to each identify an annular seat 56', 56' ', each annular seat 56', 56' ' housing a respective sealing gasket 60', 60' ' .

[0087] Each sealing gasket 60', 60' ' is axially compressed between the respective annular seat 56', 56' ' and the front end 24', 24 '^f of the respective cylindrical body 8 ' , 8 ' ' .

[0088] Preferably, the respective annular seats 56', 56' ', each associated with a cylindrical body 8', 8' ', 8' ' ', are tangent to each other and in communication with each other .

[0089] Moreover, the inner guide walls 52', 52 ' ' are contiguous to each other.

[0090] Furthermore, each rear cap 96', 96' ' is associated with the rear end 20', 20' ' by means of the interposition of a rear gasket 108', 108' ', which is axially compressed to ensure sealing.

[0091] The present invention also provides a solution of triple nozzle-holders (figures 23-33), wherein the nozzle holder 4 comprises, in one piece therewith, three contiguous cylindrical bodies 8', 8'', 8' ' ' , parallel to each other along the main axial direction X-X, wherein each cylindrical body 8', 8' ', 8' ' ' houses a respective output tube 16', 16' ', 16' ' ' [0092] The triple nozzle-holder 4 further comprises a front body 28, fitted with a closure cap 32, associated with the front end 24 of the respective cylindrical body 8',

8" , 8" ' .

[0093] In other words, the front body 28 is in a single piece so as to allow and inhibit access to the respective nozzles 40', 40", 40'" with a single opening/closing operation, respectively.

[0094] The front body 28 comprises a front wall 36 suitable to receive in abutment each nozzle 40', 40'', 40'" of a relative output tube 16', 16'', 16'".

[0095] Of course, the tank may in turn be subdivided into several compartments, also not communicating with each other, so as to associate a specific and different substance/material with each nozzle 40', 40'', 40'".

[0096] The front body 28 comprises, on a rear side 48, facing said containment volume 12, three inner guide walls 52', 52'', 52''', extending around the inner perimeter of each cylindrical body 8', 8'', 8''' so as to each identify an annular seat 56', 56'', 56'''; each annular seat 56', 56'', 56'" in turn houses a respective seal 60 ' , 60 ' ' , 60 ' ' ' .

[0097] Each sealing gasket 60', 60", 60'" is axially compressed between the respective annular seat 56', 56'', 56 and the front end 24', 24" 24'" of the respective cylindrical body 8', 8'', 8' ' ' .

[0098] Preferably, the respective annular seats 56', 56'', 56''' each associated with a cylindrical body 8', 8'', 8 ' ' ' , are tangent to each other and in communication with each other.

[0099] Preferably, the inner guide walls 52', 52 '^f , 52''' are contiguous to each other.

[00100] Furthermore, each rear cap 96', 96' ' , 96’’’ is associated with the rear end 20', 20'', 20’’’ by means of the interposition of a rear gasket 108', 108'', 108^,,f which is axially compressed to ensure sealing.

[00101] Advantageously, the nozzle holder 4 according to any of the embodiments described above is made by injection molding.

[00102] Thanks to this molding technique, it is possible to make a particularly robust component suitable to withstand the heavy working conditions of the nozzle- holder, since it is continuously exposed to external atmospheric agents.

[00103] As can be appreciated from the description, the present invention allows overcoming the drawbacks of the prior art.

[00104] In particular, the nozzle-holder always allows to have seal over time, preventing any dispersion of liquid and/or solid material from the nozzle and the tube. In fact, the gasket which has the function of ensuring the seal, always works in optimal conditions since it is firmly received in its annular seat delimited by the inner guide wall. In this way the gasket is always compressed and stressed in a uniform and axisymmetric manner .

[00105] Furthermore, the inner guide wall allows a faster extraction and re-insertion of the tube without this, by rubbing, damaging the seal itself.

[00106] Moreover, thanks to the internal guide wall the output tube can always be accompanied in its extraction and re-insertion movement in order to slide in the best way, always being coaxial to the nozzle-holder. This facilitates the manual work of the user, who must provide for the emptying of the tank, and also avoids damage to the tube itself.

[00107] The nozzle-holder is also particularly solid and at the same time cost-effective to produce, since it can be made by injection molding.

[00108] A man skilled in the art may make several changes and adjustments to the solutions described above in order to meet specific and incidental needs, all falling within the scope of protection defined in the following claims.

Claims

1. Nozzle-holder (4) for tanker trucks comprising

at least one cylindrical body (8) delimiting a containment volume (12) suitable for housing an output tube (16) of material from a tank, the cylindrical body (8) extending along a main axial direction (X-X) from a rear end (20) to a front end (24),

- a front body (28), fitted with a closure cap (32), associated with the front end (24) of the cylindrical body ( 8 ) ,

the front body (28) comprising a front wall (36) suitable to receive in abutment a nozzle (40) of said output tube (16) fluidly connected to a tank,

- the front body (28) comprising, on a rear side (48), facing said containment volume (12), an inner guide wall (52), which extends around the inner perimeter of the cylindrical body (8) so as to identify an annular seat (56) housing a sealing gasket (60),

- wherein the annular seat (56) at least partially houses the front end (24) of the cylindrical body (8),

- said sealing gasket (60) being placed, along the main axial direction (X-X), between the annular seat (56) and the front end (24) of the cylindrical body (8) .

2. The nozzle-holder (4) according to claim 1, wherein said sealing gasket (60) is an O-ring.

3. The nozzle-holder (4) according to claim 1 or 2, wherein the annular seat (56) is axially symmetrical with respect to said main axial direction (X-X) .

4. The nozzle-holder (4) according to any one of the preceding claims, wherein the annular seat (56) is counter-shaped with respect to said front end (24) of the cylindrical body (8) .

5. The nozzle-holder (4) according to any one of the preceding claims, wherein the annular seat (56) has an axial depth (64), parallel to said main axial direction (X-X), greater than an axial thickness (68) of the sealing gasket (60) .

6. The nozzle-holder (4) according to any one of the claims from 1 to 5, wherein the annular seat (56) has a radial depth (72), measured along a radial direction (R- R) perpendicular to and through said main axial direction (X-X) , which is less than or equal to a radial thickness (76) of the sealing gasket (60) .

7. The nozzle-holder (4) according to any one of the claims from 1 to 6, wherein the inner guide wall (52) has a bevelled edge (80), converging towards the containment volume (12), so as to facilitate the extraction of the output tube (16) .

8. The nozzle-holder (4) according to any one of the preceding claims, wherein the inner guide wall (52) is sized so as to constitute an extraction and re-insertion guide for said output tube (16) .

9. The nozzle-holder (4) according to any one of the preceding claims, wherein the inner guide wall (52) is dimensioned so as to have an inner diameter substantially equal to an outer diameter of the output tube (16) guided by it .

10. The nozzle-holder (4) according to any one of the preceding claims, wherein the inner guide wall (52) has at least one notch or interruption (84) to facilitate the drainage of any residues, said notch (84) being oriented at a lower side (88) of the inner guide wall (52) to convey any accumulated residues by gravity.

11. The nozzle-holder (4) according to claim 10, wherein a collection tank (92) fluidly connected with said at least one notch (84) is provided for.

12. The nozzle-holder (4) according to any one of the claims from 1 to 11, wherein a rear cap (96) is provided, associated with the rear end (20) of the cylindrical body (8) .

13. The nozzle holder (4) according to claim 12, wherein said rear cap (96) is in turn provided with a rear inner wall (100) that identifies a rear annular seat (104) that houses a rear gasket (108), wherein the rear annular seat

(104) at least partially houses the rear end (20) of the cylindrical body (8), said rear gasket (108) being placed, along the main axial direction (X-X) , between the rear annular seat (104) and the rear end (20) of the cylindrical body (8) .

14. The nozzle-holder (4) according to claim 13, wherein said rear inner wall (100) is sized so as to constitute an extraction and re-insertion guide for said output tube (16) .

15. The nozzle-holder (4) according to claim 13 or 14 wherein the rear inner wall (100) is sized so as to have an inner diameter substantially equal to an outer diameter of the output tube (16) guided by it.

16. The nozzle-holder (4) according to any one of the claims from 1 to 15, wherein the nozzle-holder (4) comprises, in one piece therewith, a pair of cylindrical bodies (8', 8''), parallel to each other along the main axial direction (X-X), each cylindrical body (8',8'') housing a respective output tube ( 16 ^T , 16 ^{T T} ) ,

- a front body (28), fitted with a closure cap (32), associated with a front end (24',24'') of each cylindrical body (8' , 8 ^{T T} ) ,

the front body (28) comprising a front wall (36) suitable to receive in abutment each nozzle (40^f,40'') of a relative output tube (16' ,16'') fluidly connected to a tank, - the front body (28) comprising, on a rear side (48), facing said containment volume (12), a pair of inner guide walls (52’ , 52’ ’ ) , extending around the inner perimeter of the cylindrical body (8' ,8' ') so as to each identify an annular seat ( 56 ^T , 56 ^{T T} ) , each annular seat (56' ,56' ') housing a respective sealing gasket

(60' , 60' ' ) ,

- wherein each annular seat ( 56 ' , 56 ' ' ) houses at least partially the front end ( 24 ' , 24 ' ' ) of the corresponding cylindrical body ( 8 ' , 8 ' ' ) ,

- each sealing gasket (60', 60' ') being placed, along the main axial direction (X-X) , between the corresponding annular seat (56', 56' ') and the front end ( 24 ' , 24 ' ' ) of the corresponding cylindrical body ( 8 ' , 8 ' ' ) .

17. The nozzle-holder (4) according to claim 16, wherein the respective annular seats (56'^' ,56' ' ) , each associated with a cylindrical body (8', 8' ', 8' ' '), are tangent to each other and in communication with each other.

18. The nozzle-holder (4) according to any one of the preceding claims, wherein the inner guide walls (52', 52' ') are contiguous to each other.

19. The nozzle-holder (4) according to any one of the preceding claims, wherein the nozzle holder (4) comprises, in one piece therewith, three contiguous cylindrical bodies ( 8 ' , 8 ' ' , 8 ' ' ' ) , parallel to each other along the main axial direction (X-X) , each cylindrical body ( 8 ' , 8 ' ' , 8 ' ' ' ) housing a respective output tube (16),

- a front body (28), provided with a closure cap (32), associated with a front end (24 ' , 24 ' ' , 24 ' ' ' ) of each cylindrical body (8', 8' ', 8' ' ')_/

the front body (28) comprising a front wall (36) suitable to receive in abutment each nozzle ( 40 , 40 , 40 ' ' ' ) of a relative output tube ( 16 ' , 16 ' ' , 16 ' ' ' ) fluidly connected to a tank,

- the front body (28) comprising, on a rear side (48), facing said containment volume (12), three inner guide walls ( 52 , 52 ' ' , 52 ' ' ' ) , extending around the inner perimeter of each cylindrical body ( 8 ' , 8 ' ' , 8 ' ' ' ) so as to each identify an annular seat ( 56 ' , 56 ' ' , 56 ' ' ' ) , each annular seat ( 56 ' , 56 ' ' , 56 ' ' ' ) housing a respective seal (60’ , 60’ ’ , 60’’’ ) ,

- wherein each annular seat ( 56' , 56' , 56 ' ' ' ) houses at least partially the front end (24 ' , 24 ' ' , 24 ' ' ' ) of the corresponding cylindrical body (8',8' ',8’ ’ ’),

each sealing gasket ( 60 , 60 , 60 ' ' ' ) being placed, along the main axial direction (X-X) , between the corresponding annular seat ( 56 ' , 56 ' ' , 56 ' ' ' ) and the front end (24 ' , 24 ' ' , 24 ' ' ' ) of the corresponding cylindrical body (8’, 8’ ’, 8’ ’ ’) .

20. The nozzle-holder (4) according to claim 19, wherein the respective annular seats ( 56' , 56' , 56 ' ' ' ) , each associated with a cylindrical body ( 8 ' , 8 ' ' , 8 ' ' ' ) , are tangent to each other and in communication with each other .

21. The nozzle-holder (4) according to any one of the claims from 19 to 20, wherein the inner guide walls ( 52’ , 52 ' ' , 52 ' ' ' ) are contiguous to each other.

22. Method of making a nozzle-holder (4) according to any one of the preceding claims, characterized in that said nozzle-holder (4) is made by injection moulding.