C - Chemistry – Metallurgy – 14 – B
Patent
C - Chemistry, Metallurgy
14
B
271/14, 154/29
C14B 11/00 (2006.01) B29C 17/02 (1980.01) B29C 24/00 (1980.01)
Patent
CA 1128844
ABSTRACT OF THE DISCLOSURE A cover sheet is disposed over a recess in a work table. A folding apparatus, including an edge fo?ar and edge erector is disposed over the recess and lowered until the edge erector is in the recess. The edge erector includes horizontally movable plates which are moved outwardly against the edges of the recess to erect the marginal edges of the sheet. The edge folder has downwardly depending, horizontally moving members. The edge folder is lowered until the members touch the work table after which the members are moved inwardly to fold the erected marginal edges of the sheet hori- zontally over the plates. The plates are then with- drawn while the edge folder members are maintained in contact with the folded marginal edges, and high frequency heat applied to weld the folded marginal edges to the sheet. After the welding is completed the edge erector and edge folder are raised to their initial position and the members are returned to their outward positions.
325442
Kabushiki Kaisha Tomita Sangyo
Kirby Eades Gale Baker
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