William Kenneth Weidman

US Patent:

48182117, Apr 4, 1989

Filed:

Mar 24, 1987

Appl. No.:

7/029625

Inventors:

William J. Weidman - Old Tappan NJ
Edmund Netz - Rego Park NY

Assignee:

Cardinal Tank Co. - Brooklyn NY

International Classification:

B29C 4104

US Classification:

425425

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.

US Patent:

48836265, Nov 28, 1989

Filed:

Nov 21, 1988

Appl. No.:

7/274274

Inventors:

William J. Weidman - Old Tappan NJ
Edmund Netz - Rego Park NY

Assignee:

Cardinal Tank Corp. - Brooklyn NY

International Classification:

B28B 148
B28B 716
B28B 134
B29C 3340

US Classification:

264156

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.