Wiper device

1. A wiper device for a blown glass or plastic container, comprising

a hollow body having a first and a second end defining respectively a first and a second opening,

a flange extending from an outer surface of the hollow body at the first end, and

a wiper element extending from an inner surface of the hollow body and towards the second end, the wiper element defining a passage of smaller section than the first and second openings,

the hollow body providing at least one first row and a second row of flexible fins extending from the outer surface of the hollow body near the second end, the first and second rows of flexible fins being positioned distant the wiper element and being at least partially positioned in a band of the outer surface extending between the wiper element and the second end of the hollow body, and

wherein the second row of flexible fins, which is closer to the second end in respect to the first row has, in a non-flexed configuration, a diameter that is greater than the diameter of the first row of fins in a non-flexed configuration.

2. The device according to claim 1 , wherein either or both of the first row of fins and the second row of fins comprises a single fin extending along an entire perimeter of the hollow body.

3. The device as claimed in claim 1 , wherein the first row of fins comprises two first fins arranged, when not deformed, on a same first plane perpendicular to an axis of the wiper device, and wherein the second row of fins comprises two second fins disposed, when not deformed, on a same second plane which is closer to the second end than the first plane.

4. The device as claimed in claim 3 , wherein each of the first fins and each of the second fins comprises in a plan view, an outer perimeter shaped as an arc of a circle, the ends of the arc being connected to two straight sections which are tangentially connected to the outer surface of the hollow body.

5. The device as claimed in claim 1 , wherein at least one first flexible fin of the first row and at least one second flexible fin of the second row each have, in a radial section, a triangular or trapezoidal configuration with a major base located on the outer surface of the hollow body.

6. The device according to claim 1 , wherein the hollow body comprises at least one open window at a free edge of said second end, the at least one open window being at least partially positioned in the band of the outer surface where the first and second rows of the fins are also located, said band having a height equal to at least one window.

7. The device according to claim 6 , wherein the inner surface of the hollow body has at least one rib that is angularly spaced from the window at an angle of 90°.

8. The device according to claim 1 , wherein there are two diametrically-facing windows.

9. The device according to claim 1 , wherein the inner surface of the hollow body has at least one rib.

10. The device according to claim 1 , wherein the wiper element comprises at least one opening made on a frustoconical surface at one end of which the passage of the wiper element is defined, the opening being configured to drip residues of a wiped fluid.

11. The device according to claim 1 , wherein the outer surface of the wiper is configured to form a seal within a mouth of the container, and the outer surface of the hollow body has, formed in one piece with the hollow body, at least a protruding sealing ring positioned outside said band.

12. The device according to claim 1 , wherein the first row of fins comprises a single fin extending along the entire perimeter of the hollow body.

13. The device according to claim 1 , wherein the second row of the fins comprises a single fin extending along the entire perimeter of the hollow body.

14. The device as claimed in claim 1 , wherein the first row of fins comprises two first fins arranged, when not deformed, on a same first plane perpendicular to an axis of the wiper device.

15. The device as claimed in claim 14 , wherein the second row of fins comprises two second fins disposed, when not deformed, on a same second plane which is closer to the second end than the same first plane.

16. The device as claimed in claim 1 , wherein at least one flexible fin of the first row has, in a radial section, a triangular or trapezoidal configuration with a major base located on the outer surface of the hollow body.

17. The device as claimed in claim 1 , wherein at least one flexible fin of the second row has, in a radial section, a triangular or trapezoidal configuration with a major base located on the outer surface of the hollow body.

18. The device as claimed in claim 1 , wherein either the first row of fins comprises two first fins arranged, when not deformed, on a same first plane perpendicular to an axis of the wiper device, or the second row of fins comprises two second fins disposed, when not deformed, on a same second plane which is closer to the second end than the first plane.

19. The device as claimed in claim 18 , wherein each of the first fins or each of the second fins comprises in a plan view, an outer perimeter shaped as an arc of a circle, the ends of the arc being connected to two straight sections which are tangentially connected to the outer surface of the hollow body.

20. The device according to claim 1 , wherein the wiper element is configured to isolate the passage defined by the wiper element from inner surface of the hollow body.