Pipe joints or couplings – Nonmetal to metal – Internal member
Patent
1993-05-21
1995-02-14
Nicholson, Eric K.
Pipe joints or couplings
Nonmetal to metal
Internal member
285342, 285343, 285423, F16L 1906
Patent
active
053888715
ABSTRACT:
A resin-made detachable fitting to which a tube is connected. The fitting comprises a core of a cylindrical or ring shape forcibly inserted into the tube end to expand it, a fitting body having an inner passage, and a box nut able to mesh with ends of the fitting body and connecting the tube end to the fitting body. The fitting body comprises a cylindrical socket portion axially cylindrically extending from the fitting body ends and having an outer diameter equal to the inner diameter of the core. The socket portion has a sealing surface at its end. The fitting body further comprises a cylindrical securing portion axially extending from the fitting body ends and formed coaxially around the socket portion to form an insertions space. The securing portion has a securing wall facing the socket portion and holding, together with the socket portion, the tube inserted into the insertion space. The box nut comprises a holding surface facing the sealing surface. The box nut further has a female thread part on its inner surface and a polygonal thread head portion for turning it on its outer surface. The thread head portion is different in axial position from the female thread part and an outer surface which faces the female thread part is a complete round.
REFERENCES:
patent: 2439351 (1948-04-01), Thayer
patent: 2877027 (1959-03-01), Bagnell
patent: 3030129 (1962-04-01), Appleton
patent: 4194768 (1980-03-01), Gretz
patent: 4500118 (1985-02-01), Blenkush
patent: 4508374 (1985-04-01), Kantor
patent: 4666190 (1987-05-01), Yamabe et al.
patent: 4705304 (1987-11-01), Matsuda et al.
patent: 4729583 (1988-03-01), Lalikos et al.
patent: 5154453 (1992-10-01), Nishio
Kakizaki Manufacturing Co., Ltd.
Nicholson Eric K.
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