Method of molding a manhole frame for spherical tanks

Details Method of molding a manhole frame for spherical tanks Method of molding a manhole frame for spherical tanks

1988-11-21

1989-11-28

Silbaugh, Jan H.

Plastic and nonmetallic article shaping or treating: processes

With severing, removing material from preform mechanically,...

Making hole or aperture in article

264219, 264308, 264309, 264310, 264DIG72, 425425, B28B 148, B28B 716, B28B 134, B29C 3340

Patent

active

048836265

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.

REFERENCES:
patent: 3309762 (1967-03-01), Harper
patent: 3461009 (1969-08-01), Snyder et al.
patent: 3783060 (1974-01-01), Goldsworthy et al.
patent: 4088808 (1978-05-01), Cornwell et al.
patent: 4705468 (1987-11-01), LeBreton

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