Paul Jerome Kao

US Patent:

39645223, Jun 22, 1976

Filed:

Sep 20, 1971

Appl. No.:

5/181824

Inventors:

Paul W. Kao - Covina CA
Homer C. Lamborn - Glendora CA

Assignee:

United States Pipe and Foundry Company - Birmingham AL

International Classification:

B65H 100

US Classification:

242 722

Abstract:

In the manufacture of prestressed concrete pipe, wire is wound under tension around the concrete body of the pipe and secured thereto. In accomplishing this the concrete pipe is mounted on a turntable for rotaton about the longitudinal axis of the pipe and wire under tension is wrapped thereon in a helical fashion from one end to the other.

US Patent:

39645215, Jun 22, 1976

Filed:

Sep 16, 1974

Appl. No.:

5/506438

Inventors:

Paul W. Kao - Covina CA
Homer C. Lamborn - Glendora CA

Assignee:

United States Pipe and Foundry Company - Birmingham AL

International Classification:

138

US Classification:

138176

Abstract:

In the manufacture of prestressed concrete pipe, wire is wound under tension around the concrete body of the pipe and secured thereto. In accomplishing this the concrete pipe is mounted on a turntable for rotation about the longitudinal axis of the pipe and wire under tension is wrapped thereon in a helical fashion from one end to the other.