Method for forming seams in box-shaped members

Details Method for forming seams in box-shaped members Method for forming seams in box-shaped members

1993-02-18

1993-09-14

Eley, Timothy V.

Metal working

Method of mechanical manufacture

Assembling or joining

29514, 29524, B23P 1900

Patent

active

052437507

ABSTRACT:
A method and apparatus for forming the locking bend on a Pittsburgh type seam used in joining the sections during assembly of box-shaped sheet metal ducts. The apparatus provides a means for securely holding the duct without the use of a mandrel to permit the sheet metal along the seam to be bent over by a forming roller moving along the seam so as to complete the joint and lock the seam.

REFERENCES:
patent: 3875642 (1975-04-01), Knudson
patent: 3987740 (1976-10-01), Merson
patent: 4111143 (1978-09-01), Stubbings
patent: 4395894 (1983-08-01), McCorvey
patent: 4424618 (1984-01-01), Stubbings
patent: 4497189 (1985-02-01), Larson
patent: 4614102 (1986-09-01), Karr
patent: 4918797 (1990-04-01), Watkins et al.

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