David Allen Freeman

US Patent:

40515699, Oct 4, 1977

Filed:

Oct 22, 1976

Appl. No.:

5/735009

Inventors:

David Bruce Freeman - Cincinnati OH
Michael C. Patton - Fairfield OH
Carl F. Dragan - Harrison OH

Assignee:

Louis G. Freeman Company - Cincinnati OH

International Classification:

A43D 1100
C14B 0000
B65H 4522

US Classification:

12146CK

Abstract:

An apparatus for folding and sealing the edges of a non-rigid work piece and a method of performing folding and sealing operations therewith. The apparatus comprises a press with a main cylinder, at least one auxiliary cylinder and upper and lower die assemblies for the press. The upper die assembly comprises a folding cavity plate operatively connected to the main cylinder and having a folding cavity with an electrode surrounding a part at least of the cavity. A stripper in association with the upper die assembly is independently shiftable by the at least one auxiliary cylinder between a retracted position above the folding cavity and an extended position therebelow. The bottom die assembly comprises a plate having a female cavity therein of a size and shape equivalent to that of the folded work piece and a male plug receivable within the female cavity with close tolerance. The female cavity plate and the male plug are shiftable relative to each other by the folding cavity plate and the stripper, respectively, of the upper die assembly. Means are provided to connect the electrode and the stripper to a source of high frequency electricity.