Die system for making manhole frame for spherical tanks

Details Die system for making manhole frame for spherical tanks Die system for making manhole frame for spherical tanks

1987-03-24

1989-04-04

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Female mold including tamping means or means utilizing mold...

264250, 264311, 264318, 425402, 425453, 425DIG58, B29C 4104

Patent

active

048182117

ABSTRACT:
A three piece die is provided for making an access-hole frame and 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 using the three-piece die by placing the three-piece die in stages upon rotatable table and spraying the nonmetal moldable material onto the rotating bottom and top die pieces. The access-hole frame so produced may be used for the construction of a spherical tank made of nonmetal moldable material.

REFERENCES:
patent: 3309762 (1967-03-01), Harper
patent: 3783060 (1974-01-01), Goldsworthy et al.
patent: 4705468 (1987-11-01), LeBreton

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