Metal working – Method of mechanical manufacture – Gas and water specific plumbing component making
Patent
1994-10-13
1996-10-29
Cuda, Irene
Metal working
Method of mechanical manufacture
Gas and water specific plumbing component making
29456, B23P 1500
Patent
active
055686877
ABSTRACT:
A method of making a tank includes the steps of forming a pair of top and bottom half members by deep drawing, welding at least one tank connector assembly in an opening in one of the half members and fastening the top and bottom half members together by welding to form an outer shell having an internal surface. The outer shell is changed with non-corrosive polymer material before or after the welding step. The tank is subjected to a rotational movement in the presence of heat to thus cause the polymer material to be uniformly distributed over the internal surface of the outer shell to thereby form an inner shell of non-corrosive material inside the outer shell wherein the inner shell provides a substantially leak-tight liner for the outer shell to thus prevent contact between the contents of the tank and the outer shell, said outer shell serving as a mold for the inner shell wherein the mold becomes a permanent part of the completed tank. The tank connector assembly is fabricated by first providing a metal connector member having a tubular wall and a welding projection on one end thereof, inserting an insert member of non-metallic, non-corrosive material in one end of the metal connector member. Forming a connector sleeve inside the assembly of the metal connector member and insert member by injection molding. The connector sleeve member has an internally threaded tubular wall portion and is made of a polymer material having "low creep" characteristics.
REFERENCES:
patent: Re27496 (1973-04-01), Metcalf
patent: 4712711 (1987-12-01), Gerry et al.
patent: 5158200 (1992-10-01), Vago et al.
patent: 5217140 (1993-06-01), Lindahl
Faber Rolf E.
Lindahl D. Kent
Syler Rodeny R.
Cuda Irene
Puerner Paul R.
State Industries, Inc.
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