Metal working – Method of mechanical manufacture – Assembling or joining
Patent
1976-01-21
1977-05-17
Hoag, Willard E.
Metal working
Method of mechanical manufacture
Assembling or joining
295271, 264275, 264277, 264279, 264310, 264334, B29C 504, B29D 302
Patent
active
040232573
ABSTRACT:
An improved method for making leak-proof connections to fuel tanks and other hollow articles rotationally molded from synthetic resinous materials, and particularly from relatively soft materials such as polyethylene. Prior to molding the article in a conventional rotational mold process, one or more male or female studs or similar threaded fittings are bolted to or otherwise temporarily held against the interior surface of the mold at a location which corresponds to the location for the leak-proof connections in the finished article. When a number of threaded fittings are located relatively close together or are spaced around an opening in an article, the fittings are preferably interconnected by wires or other metal support members which is embedded in the finished article. The support member strengthens the connection and also maintains a fixed spacing between the fittings. The article is then rotationally molded such that the fitting is embedded in the wall of the finished article. After molding is completed and the article is removed from the mold, a leak-proof connection is made to the threaded fitting which forms an integral part of the article wall.
REFERENCES:
patent: 3100643 (1963-08-01), Nicholls et al.
patent: 3299501 (1967-01-01), Cox
patent: 3557274 (1971-01-01), Kowell
patent: 3559308 (1971-02-01), Bernier et al.
Neidinger William K.
Wright Stephen J.
Hoag Willard E.
NL Industries Inc.
Todd, Jr. Oliver E.
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