Combined mould element and sealing ring

Details Combined mould element and sealing ring Combined mould element and sealing ring

1975-08-28

1977-06-21

Flint, Jr., J. Howard

Plastic article or earthenware shaping or treating: apparatus

Preform reshaping or resizing means: or vulcanizing means...

Rod or tubular preform

425DIG218, 425DIG44, 425DIG47, B29C 1700

Patent

active

040308723

ABSTRACT:
Combined mould element and sealing ring suitable for sealing off a joint between a socket end and an insert end of two cooperating pipes formed from thermoplastic material and for being used as a portion of a body of a mould for both fabricating the socket end of the one pipe and simultaneously inserting the ring in an internal groove in the socket end produced thereby. The main bulk of the sealing ring is composed of elastically yielding material having within its contour at least one zone composed of relatively non-elastic material capable of rendering the zone stable as regards its shape compared with the remainder of the ring. Conveniently, such zones are formed by stiffening rings permanently connected to the main bulk of the sealing ring.

REFERENCES:
patent: 219309 (1879-09-01), Riesel
patent: 3135520 (1964-06-01), Borah
patent: 3377659 (1968-04-01), Hucks
patent: 3520047 (1970-07-01), Muhlner et al.
patent: 3622427 (1971-11-01), Kelly
patent: 3728065 (1973-04-01), Figwer
patent: 3776682 (1973-12-01), Parmann
patent: 3843302 (1974-10-01), Petzetakis
patent: 3907481 (1975-09-01), Heisler

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