Quick-fit connection assembly

1 . A connection assembly, comprising:

a connecting element suitable for allowing a fluid sealed passage through a wall, said connecting element comprising a main body which has tubular shape and extends according to a longitudinal direction of main development,

said main body having a first terminal end portion and a second terminal end portion mutually opposite along said longitudinal direction, and further comprising a lateral external surface covered and at least partially threaded, wherein said external surface comprises a first region wherein the thread is absent;

a washer comprising:

a second main body having an annular shape, comprising a through hole developing according to said longitudinal direction, wherein said hole is defined by an internal side surface of said second main body configured to engage with said external surface of said connecting element, and

interference components configured to assume:

a rest position, wherein they are at a maximum distance from said second main body and

an operating position, wherein they interfere at least partially with said hole,

wherein said interference components comprise an interference element connected or connectable to said second main body and having a main development direction orthogonal to said longitudinal direction,

wherein said interference element:

has a central region connected or connectable at a first end portion thereof to said second main body and comprises a nosepiece element at a second end portion thereof,

wherein said central region has a facilitated folding portion in such a way as it can be folded to carry said nosepiece from said rest position,

wherein said nosepiece is at a maximum distance from said second main body, to said operating position, wherein said nosepiece interferes at least partially with said hole,

wherein said nosepiece is configured to engage with said first region of said connecting element,

the configuration of said washer being such that said interference components are configured to engage with said first external region of said connecting element and said internal side surface is configured to engage with said external surface of said connecting element when said connecting element is inserted inside said through hole, and

the configuration of said connecting element being such that said first region is configured in such a way as to realize a coupling seal with said nosepiece,

wherein said first region has an at least partially flat extension in extending along said longitudinal direction.

2 . The connection assembly according to claim 1 , wherein said first region of said connecting element extends from said first terminal end portion, up to half, or ¾, the longitudinal extension of said external surface, while the remaining portion of said external surface at said second terminal end portion is completely threaded.

3 . The connection assembly according to claim 1 , wherein said connecting element comprises a flange element at said first terminal end portion, said flange element having an oval external profile and a double-curved development with concavity facing towards said second terminal end portion.

4 . The connection assembly according to claim 1 , wherein said first region of said connecting element is shaped like a groove.

5 . The connection assembly according to claim 1 , wherein said interference components are movably connected to said second main body.

6 . The connection assembly according to claim 1 , wherein said central region of said interference element is connected or connectable at a first end portion thereof to an external side surface of said second main body.

7 . The connection assembly according to claim 1 , wherein said interference element has a substantially rectilinear shape.

8 . The connection assembly according to claim 1 , wherein said interference element extends on a plane orthogonal to said longitudinal direction when said nosepiece is in said rest configuration.

9 . The connection assembly according to claim 1 , wherein said central region of said washer comprises a first portion connected to said nosepiece and a second portion connected or connectable to said second main body, wherein said first and second portion are mutually connected at said folding portion facilitated, so that said first portion can be tipped over said second portion to carry said nosepiece in said operating position.

10 . The connection assembly according to claim 1 , wherein said washer comprises operating elements which can be handled by an operator at said first portion, said operating elements comprising a further through hole that extending in a direction orthogonal to said longitudinal direction when said nosepiece is in said operating position.

11 . The connection assembly according to claim 1 , wherein said washer has an outer octagonal shaped profile.

12 . The connection assembly according to claim 1 , wherein said second main body of said washer comprises an upper and/or lower annular surface which has a concave double-curved development.