FAST-UNCOUPLING SHOWER SCREEN FOR ESPRESSO COFFEE MACHINES

Abstract

Fast-uncoupling shower screen for espresso coffee machines having a circular support dish provided with holes, a flow restrictor disposed under the circular support dish, and an elastically deformable retention element, whereto the flow restrictor is fitted in snap-in coupling mode because of the elastic deformability of the retention element.

Claims

1. Fast-uncoupling shower screen for espresso coffee machines comprising: a circular support dish provided with holes suitable for the passage of water dispensed by a dispenser assembly of the coffee machine; a flow restrictor comprising a tub comprising a bottom with a plurality of holes; said flow restrictor being fixed below the circular support dish and said flow restrictor being suitable for restricting a water flow from the holes of the circular support dish and dispensing a plurality of water jets through the holes of the flow restrictor, characterized in that said shower screen also comprises an elastically deformable retention element suitable for cooperating with an abutment wall of the flow restrictor and/or with an abutment wall of the circular support dish, so that the flow restrictor is fitted to the circular support dish in a snap-in coupling mode.

2. The shower screen of claim 1, wherein said retention element is an open ring.

3. The shower screen of claim 2, wherein said circular support dish comprises a first annular groove housing said open ring, so that said open ring peripherally protrudes from said first annular groove.

4. The shower screen of claim 1, wherein said shower screen comprises a gasket ring arranged between said circular support dish and said flow restrictor.

5. The shower screen of claim 4, wherein said gasket ring is a rubber ring.

6. The shower screen of claim 4, wherein said circular support dish comprises a second annular groove, which houses said gasket ring so that the gasket ring peripherally protrudes from the circular support dish.

7. The shower screen of claim 6, wherein: said open ring has an internal diameter (Di-41) and an external diameter (De-41); said first annular groove has an internal diameter (Di-13); said circular support dish has an external diameter (De-10); wherein: the external diameter (De-10) of the circular support dish is greater than the internal diameter of the open ring; the internal diameter (Di-41) of the open ring is greater than the internal diameter (Di-13) of the first annular groove; and the external diameter (De-41) of the open ring is greater than the external diameter (De-10) of the circular support dish.

8. The shower screen according to claim 7, wherein said tub of the flow restrictor comprises a shaped wall and a mouth delimited by an edge; said mouth being suitable for inserting the circular support dish inside the tub until the edge of the mouth abuts against the rubber ring.

9. The shower screen according to claim 8, wherein: the shaped wall of the tub has a hourglass-shaped profile, having a first downward converging part and a second downward-diverging part, in such a way to generate an annular groove in external position on said shaped wall; said annular groove having an internal diameter (Di-25) that is smaller than the external diameter (De-41) of the open ring when not deformed; said internal diameter (Di-25) of the annular groove being identical to or slightly greater than the external diameter(De-10) of the circular supporting dish; said internal diameter (Di-24) of the mouth being greater than the external diameter (De-31) of said rubber ring; said external diameter (De-31) of the rubber ring being greater than the internal diameter (Di-25) of the annular groove.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0030] For the sake of clarity, the description of the shower screen according to the invention continues with reference to the attached drawings, which have a merely illustrative, not limiting value, wherein:

[0031] FIG. 1 is an exploded axonometric view of the various parts of the shower screen of the invention, in non-assembled condition;

[0032] FIGS. 2 to 5 show the assembly sequence of the various parts of the shower screen according to the invention, all sectioned with a diametral plane;

[0033] FIGS. 3A, 4A, 5A are enlarged views of some details of FIGS. 3, 4 and 5.

DETAILED DESCRIPTION OF THE INVENTION

[0034] With reference to FIG. 1, the shower screen (100) of the invention comprises a circular support dish (10) that removably supports a flow restrictor (20), a gasket ring (30) and an elastically deformable retention element (40) used for fixing said flow restrictor (20) to said circular support dish (10).

[0035] The gasket ring (30) is disposed between the circular support dish (10) and the flow restrictor (20).

[0036] Said circular support dish (10) is provided with a plurality of holes (11) for the passing of water dispensed by a dispenser assembly of the coffee machine.

[0037] The circular support dish (10) comprises a first annular groove (13) and a second annular groove (12).

[0038] The second annular groove (12) houses and supports the gasket ring (30), which consists in a rubber ring (31) disposed in said second annular groove (12), in such a way to peripherally project from the second annular groove (12) of the circular support dish (10).

[0039] The first annular groove (13) is disposed under the second annular groove (12). The first annular groove (13) houses and supports said retention element (40). The retention element (40) consists in an open ring (41) made of metal material. The retention element (40) is disposed in said first annular groove (13), in such a way as to peripherally project from said first annular groove (13), as shown in FIG. 3A, where said open ring (41) is shown in nondeformed position.

[0040] Being open, the open ring (41) is elastically flexible, in such a way that it can be elastically deformed in order to be reduced or enlarged, when suitably stressed.

[0041] As shown in FIG. 3A, the open ring (41) has an internal diameter (Di-41) and an external diameter (De-41). The first annular groove (13) has an internal diameter (Di-13) and the circular support dish (10) has an external diameter (De-10).

[0042] The internal diameter (Di-41) of said open ring (41) is greater than the internal diameter (Di-13) of said first annular groove (13), but smaller than the external diameter (De-10) of the support dish (10). The external diameter (De-41) of said open ring (41) is greater than the external diameter (De-10) of said support dish (10), as shown by the following inequality formulas:

De-10>Di-41>Di-13 (1)

De-41>De-10 (2)

[0043] Because of the dimension of the diameters of the first annular groove (13), of the open ring (41) and of the circular support dish (10), as shown in the formulas (1) and (2): [0044] the open ring (41) is firmly fitted inside the first annular groove (13), partially protruding from it, until said open ring (41) is not deformed, as shown in FIG. 3A; [0045] the open ring (41) is elastically reduced, penetrating in higher depth inside the first annular groove (13), as shown in FIG. 4A; [0046] the open ring (41) is elastically expanded until it is completely ejected and released from the first annular groove (13).

[0047] The flow restrictor (20) consists in a circular tub (21), which comprises a bottom (23) and a plurality of holes (23a). The flow restrictor (20) is fixed below the circular support dish (10) and is suitable for restricting a water flow from the holes (11) of the circular support dish (10) and dispensing a plurality of water jets through the holes (23a) of the flow restrictor.

[0048] The tub (21) of the flow restrictor comprises a shaped wall (22) and a mouth (24) defined by an edge (26). The mouth (24) is suitable for inserting the circular support dish (10) inside the tub (21) until the edge (26) of the mouth (24) abuts against the rubber ring (31).

[0049] Said shaped wall (22) has an hourglass-shaped profile, having a first downward-converging part (22a) and a second downward-diverging part (22b), in such a way to generate an annular groove (25) with an internal diameter (Di-25) in external position on said shaped wall (22).

[0050] The internal diameter (Di25) of said groove (25) is smaller than the external diameter (De-41) of the open ring (41) when it is not deformed.

[0051] The internal diameter (Di-25) of the annular groove (25) is identical to or slightly greater than the external diameter (De-10) of the circular supporting dish (10), as shown in FIG. 5A.

[0052] The internal diameter (Di-24) of the mouth (24) of said tub (21) is greater than the external diameter (De-31) of said rubber ring (31).

[0053] The external diameter (De-31) of the rubber ring (31) is greater than the internal diameter (Di-25) of the annular groove (25).

[0054] According to the following inequality formulas:

(Di-24)>(De-31)>(Di-25) (3)

(De-41)>(Di-25)(De-10) (4)

[0055] With reference to FIGS. 2 to 5, this description continues by illustrating the way in which the shower screen (100) is mounted inside an ordinary dispenser assembly for espresso coffee machines.

[0056] The first operation consists in mounting the rubber ring (31) and the open ring (41) in the corresponding annular grooves (13; 12) obtained on the edge of the circular support dish (10).

[0057] In both cases, the elastic deformability of the rubber ring (31) and of the open ring (41) permits to enlarge them sufficiently in order to be inserted outside the circular support dish (10), around which they are automatically fitted when the deformation ends.

[0058] The next operation consists in fixing the circular support dish (10) inside the dispenser assembly, by means of an ordinary fixing screw (60) that is inserted through a central hole (14) of the circular support dish (10) and screwed into a threaded seat that is obtained inside the dispenser assembly.

[0059] The last operation consists in fitting the flow restrictor (20) to the circular support dish (10); this operation only requires to axially push the flow restrictor (20) from down upwards, until said edge (26) of the mouth (24) of the tub of the flow restrictor abuts against the rubber ring (31), as shown in FIG. 5.

[0060] Before stopping the edge (26) of the mouth (24) against the rubber ring (31), the annular groove (25) obtained on the edge (22) of the tub (21) interferes with the open ring (41), forcing it to be constrained inside the first annular groove (13), as shown in FIG. 4A.

[0061] The internal diameter (Di-41) of said open ring (41) is greater than the internal diameter (Di-13) of said first annular groove (13), and therefore an elastic deformation can be imposed on the open ring (41) that is positioned inside the first annular groove (13), determining a temporary reduction of its external diameter (De-41). So, the annular groove (25) acts as abutment wall for the retention element. Because of the deformation, the retention element may come in contact with a bottom wall of the first annular groove (13). In such a case, also the bottom wall of the first annular groove (13) acts as abutment wall for the retention element.

[0062] Evidently, as soon as the interference between said annular groove (25) and said open ring (41) ends, the open ring (41) is elastically expanded, recovering its dimension in non-deformed position, as shown FIG. 5A.

[0063] Because of the expansion of the open ring (41), the tub (22) remains attached and fitted to the circular support dish (10) since the interference between the non-deformed open ring (41) and the annular groove (25) prevents the tub (22) from falling freely, as shown in FIG. 5A.

[0064] In order to uncouple the flow restrictor (20) from the circular support dish (10) the tub (22) simply needs to be held and pulled downwards in axial direction, with sufficient energy to cause a new elastic reduction of the open ring (41).

[0065] The fixing operation of the circular support dish (10) to the dispenser assembly may be eliminated if the dish is obtained in one piece with the dispenser assembly.

[0066] In the aforementioned embodiment, the open ring (41) acts as retention element, whereas the annular groove (25) and, eventually, also the bottom wall of the first annular groove (13) act as abutment walls.

[0067] The main characteristic of the present invention is represented by the elastically deformable retention element, which is suitable for cooperating with an abutment wall of the flow restrictor and/or with an abutment wall of the circular support dish, in such a way that the flow restrictor is fitted to the circular support dish in snap-in coupling mode.

[0068] Although not shown in the figures, the retention element can be connected to or integral with the flow restrictor and can interfere only with the abutment wall of the support dish or with both the abutment wall of the support dish and the abutment wall of the flow restrictor.