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1. (WO2017153871) GRID DEVICE WITH ELASTIC FIXING SYSTEM
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CLAIMS

1, Grid device (1) with elastic fixing system, comprising a grid means (3) for aeration or similar purposes, intended to be removably fixed to the inlet mouth (Al) of a pipe (A) or of a hole made in a wall and having an inner side (5) and an outer side (7) intended to be respectively facing towards the pipe (A) or hole and in the opposite direction, said grid device (1) furthermore comprising a connection means (9) constrained to said inner side (5) and intended to become reversibly engaged with the inlet mouth (Al) so as to create a condition in which the grid means (3) and the inlet mouth (Al) are mutually fixed to each other, wherein said device (1) is characterized in that the connection means (9) comprises at least one resilient element (11) which is in the shape of an arc of a circle, of an ellipse or of an oval, defining a chord whose maximum length when at rest, meaning in a condition in which it is detached from said inlet mouth (Al), exceeds the diameter or transverse dimension of said inlet mouth (Al) of the pipe (A) or hole, and which, in the fixed position in which it is coupled with the inner surface (A2) of the inlet mouth (Al), has an angular development exceeding 180°.

2, Device according to claim 1, characterized in that the connection means (9) furthermore comprises a fixing means (13) made in a single body with the resilient element (11) or fixed to it, preferably to its centre portion, and provided with a seat (14) for screw means (16) or fixing means or with a glueing or welding surface for fixing said connection means (9) to the inner side (5) of the grid means (3).

3. Device according to claim 1, characterized in that said connection means (9) furthermore comprises a fixing means (13) made in a single body with the resilient element (11) or fixed to it, and provided with at least one seat (14) for the engagement of screw means (16) or fixing means for fixing said connection means

(9) to the inner side (5) of the grid means (3), and wherein said seat (14) is slotted or elongated in at least one direction, in order to allow the position of said connection means (9) to be adjusted with respect to said grid means (3).

4. Device according to claim 3, characterized in that said grid means (3) is

provided with a seat or hole (15) suited to allow the engagement of said screw means (16) or fixing means for fixing said connection means (9) to said grid means (3).

5. Device according to any of the preceding claims, characterized in that said fixing means (13) is substantially elongated and constrained to said resilient element

(11) in its centre portion, and wherein said seat (14) is elongated in the direction of said fixing means (13), and wherein said fixing means (13) is sized so that it can be fixed to the centre portion of the inner side (15).

6, Device according to any of the preceding claims, characterized in that the at least one resilient element (11) is made of at least one among the following materials: a plastic material, a composite material comprising fibres in a synthetic resin matrix or a metallic material, either bare or incorporated in plastic or resin.

7, Device according to any of the preceding claims, characterized in that the ends of the convex side of the at least one resilient element (11) are provided with corresponding friction elements made of an adhesive material or a high friction material, for example a rubber material, an elastomeric material or preferably a silicone material, in order to produce greater friction on the inner surface of the inlet mouth (Al).

8, Device according to any of the preceding claims, characterized in that the grid means (3) is made of a metallic material, plastic, plastic reinforced with fibres or a composite material.

9. Device according to any of the preceding claims, characterized in that the at least one resilient element (11) is constituted by an elongated plate in the shape of an arc of a circle, whose width and thickness are respectively included between one twentieth and one third of its longitudinal development and between one thousandth and one fiftieth of said longitudinal development.

10. Device according to any of the claims from 1 to 6, characterized in that the connection means (9) comprises two resilient elements (11), wherein the ends of a resilient element (11) act in such a way as to separate the ends of the other resilient element (11), and wherein said elements (11) have respective matching or opposite concave portions.

11. Device according to any of the claims from 1 to 6, characterized in that the connection means (9) comprises two opposite resilient elements (11) whose ends are intended to be coupled with the inner surface of the inlet mouth (Al).

12, Device according to any of the claims from 1 to 6, characterized in that the connection means (9) comprises a resilient element (11) constituted by a shaped metallic laminar spring, fixed centrally to a support of the fixing means (13), or the connection means (9) comprises a resilient element (11) constituted by a metallic laminar spring and a second resilient element (11) constituted by a shaped plastic spring, wherein one end of a resilient element (11) is fixed to the end of the other resilient element (11) and the remaining ends of said resilient elements (11) are mutually connected in a sliding manner, or the connection means (9) comprises a single metallic resilient element (11) made in a single piece with the fixing means (13).