초록 ▼

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 th

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.

대표청구항 ▼

A notching machine comprising: support means; a pair of spaced apart end presses mounted on said support means, an intermediate press mounted on said support means in a line with said end presses; each of said presses including a punch and a die in vertical spaced registered alignment with one anoth

A notching machine comprising: support means; a pair of spaced apart end presses mounted on said support means, an intermediate press mounted on said support means in a line with said end presses; each of said presses including a punch and a die in vertical spaced registered alignment with one another, said punch being selectively vertically movable into said die, said support means and said presses forming a horizontal window when said punches are spaced from said dies, said window having a height defined by the spaces between said punches and said dies and having width at least as long as the distance between the outside edges of said punches and dies of said two end presses, said window being free from obstruction so as to permit a sheet of metal to pass therethrough continuously in a horizontal direction transverse to said line; a sliding frame carrying said intermediate press and being movably mounted to said support means for movement along said line; said sliding frame comprising an upper member connected to said intermediate punch, a lower member connected to said intermediate die, and a vertical member interconnecting said upper and lower members whereby said slide frame causes said punch and said die to move in unison whenever said slide frame moves along said line.