KOMBINERT FORME- OG TETNINGSELEMENT TIL BRUK I EN MUFFEENDE I TERMOPLASTROER

摘要

Combined mould and sealing element suitable for sealing off a joint between a socket end and an insert end of two cooperating pipes formed from a thermoplastic material and for being used as a portion of a body of a mould for both fabricating said socket end of the one pipe and simultaneously inserting said element in an internal groove in the socket end produced thereby. The element consists of a main body of annular form composed of an elastically yielding material housing a reinforcing core of relatively non-elastic material capable of retaining its shape relative to the main body. The main body has a radial outer portion which in its active condition is adapted to abut the bottom of the internal groove and in its inactive condition projects outwardly as a flap. Between the flap and an inner and opposing portion of the main body there is formed an opening dimensioned to facilitate ready introduction and housing of the core. The flap has a wall thickness which is locally reduced at a position remote from its free end which permits ready bending and clamping of the flap against the inner portion to close off the opening in the active condition.