Method of molding a manhole frame for spherical tanks
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United States of America Patent
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Nov 28, 1989
Issued Date -
N/A
app pub date -
Nov 21, 1988
filing date -
Mar 24, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A access-hole frame for the construction of a spherical tank made of nonmetal moldable material, the frame having a cylindrical neck, an outwardly extending flange at the top side of the neck, and a collar configured as a segmented sphere to be integrated with the spherical wall of the tank. Bolt holes are drilled around the flange for bolts that hold an access-hole cover to the access-hole frame. A three-piece die provided for making the access-hole frame includes a bottom die piece and two top pieces that are bolted together to form an integral top die piece that fits over the bottom die piece. The access-hole frame is formed in accordance with a manufacturing process by placing the three-piece die in stages upon a rotatable table and spraying the nonmetal moldable material onto the rotating bottom and top die pieces.
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