Cutting – Two tool pairs – driver for one pair moves relative to driver... – With variable spacing between tool pairs
Patent
1975-03-21
1976-09-28
Simpson, Othell M.
Cutting
Two tool pairs, driver for one pair moves relative to driver...
With variable spacing between tool pairs
83560, 83692, 83917, B26D 512
Patent
active
039824578
ABSTRACT:
The method of fabricating the sheet metal duct units of the present invention comprises cutting a plurality of spaced lines of notches in an elongated strip of sheet metal, each of the lines being transverse to the longitudinal axis of the strip. The strip is sheared at predetermined points along the length thereof so that the cutting and the shearing operation combine to form sheet metal segments each having at least one cleat tab on at least one end thereof. Next the sheet metal segments are bent along at least one axis extending longitudinally with respect to the longitudinal axis of the sheet metal so as to form an upstanding leg, the cleat tab being on one end of the upstanding leg. The cleat tab is then bent back against the remainder of the upstanding leg so as to form a cleat.
The apparatus for accomplishing the above process comprises a straight line assembly including a notching means for forming notches in predetermined points across the width of the strip, shearing means for shearing the strip into segments of predetermined length; roll former RB means for forming the upstanding leg and for forming additional folds along a line parallel to the longitudinal axis of the strip; and cleat forming means positioned adjacent the roll press means for receiving the folded sheet elements therefrom and for engaging and bending the end edges of the upstanding leg to form a cleat.
REFERENCES:
patent: 1175198 (1916-03-01), Thomas
patent: 2102170 (1937-12-01), Stern
patent: 2369617 (1945-02-01), Somerville
patent: 3198052 (1965-08-01), Persson
patent: 3485131 (1969-12-01), Brolund
patent: 3570356 (1971-03-01), Williams
patent: 3580120 (1971-05-01), Adams et al.
Silverberg Fred A.
Simpson Othell M.
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