公开(公告)号：US3822160A

公开(公告)日：1974-07-02

申请号：US25796472

申请日：1972-05-30

Applicant: ALUMINUM CO OF AMERICA

Inventor： LA BARGE R ,  PAINTER R

IPC: B29C37/02 ,  B29C37/04 ,  B29C53/06 ,  B29C53/08 ,  B29C55/08 ,  B29C65/02 ,  B29C65/74 ,  B29C17/02 ,  B29C17/08

CPC classification number: B29C53/066 ,  B29C37/02 ,  B29C37/04 ,  B29C53/083 ,  B29C55/085 ,  B29C65/02 ,  B29C65/103 ,  B29C65/743 ,  B29C65/7841 ,  B29C66/1162 ,  B29C66/52431 ,  B29C66/71 ,  B29C66/8221 ,  B29C66/82261 ,  B29C66/8227 ,  B29C66/83241 ,  B29C2793/00 ,  B29K2021/00 ,  B29L2031/003 ,  B29L2031/26 ,  Y10T156/1028 ,  Y10T156/1036 ,  Y10T156/1051 ,  Y10T156/1054 ,  Y10T156/108 ,  Y10T156/1313

Abstract: Apparatus and a method for forming a mitered corner in an unnotched channel-shaped strip of flexible elastomeric material are provided wherein such a strip is positioned over a mandrel having a contoured portion on it in the shape of the mitered corner to be formed, the mandrel is moved against support blocks to form a bend in the strip and a loop in the side flange of the strip, hot air is forced against inside surfaces of the loop to heat the elastomeric material to a plastic adhesive state, and blades are closed against the loop of material to weld abutting surfaces together and thereafter sever excess material from the welded corner at completion of the closing of the blades.