Patent ID: 8042660

Claim:
A device for braking the movement of a door, drawer, or similar member movable with respect to a fixed structure and urged by unidirectional thrust means, comprising: a casing fixable to one of said movable member and structure, said casing comprising a wall which surrounds a chamber filled with a viscous braking fluid and has an inner surface facing the chamber, a cover mounted and welded on a shoulder surface of the wall of the casing so as to close said chamber in a sealed manner, and a rotor mounted rotatably on the casing, said rotor comprising a disc portion, adapted to rotate within the chamber, and a shaft portion extending axially from the disc portion and emerging through the cover so as to be operationally associable with the other of said movable member and structure, wherein the cover has peripherally a collar protuberance, extending along the entire perimeter of the cover and coupled to the an inner surface of the wall of the casing in such a way as to oppose the infiltration of the viscous fluid between said collar protuberance and the inner surface of the wall of the casing, and wherein between the collar protuberance and the inner surface of the wall of the casing a gap is defined, which has a maximum radial width in proximity to the cover, and a minimum width at a portion of the collar protuberance coupled to the inner surface of the wall of the casing.