Patent ID: 8783730

Claim:
A flange assembly for a watertight coupling of smooth surface pipes, comprising: a triple metal ring structure for anchoring and retention, said triple metal ring structure comprising: three unitary rings which are identical and form substantially an entirety of a circumference, and a metal sheet in which said three unitary rings are solidly joined as a single part as a base of said triple ring structure, which base constitutes a support surface having a width equal to a width of the metal sheet with which said triple ring structure is produced in its entirety, said three unitary rings being parallel to one another and axially spaced from one another within said base, wherein each of said unitary rings is provided throughout an entirety of its inner edge with a succession of vertices, said vertices' profile being formed by folding and cutting each said respective unitary ring, said folds orientated towards an outside of each respective unitary ring, wherein each of said unitary rings are configured to rest on a smooth outer surface of a pipe, and wherein said vertices are configured to be driven into the smooth outer surface of the pipe to prevent an axial displacement allowing an application of said triple ring structure, and to distribute a penetrating action so as to decrease a possibility of tearing and damage of the smooth outer surface of the pipe.