System and method for forming a full engagement male lock in a ductline
AssigneeMestek Machinery, Inc.
InventorsDAVID KRIVANEK, TIMOTHY AARON COON
Life of this patent
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Abstract
The present invention provides a method for producing a full engagement Pittsburgh male lock using specific cutting assemblies and protocols that reduce the amount of metal that is removed from the male portion of the corner notches in the duct. Forming of the male portion of the lock is done after the connecting flange forming has been completed as opposed to before the connecting flange forming has been completed.
Claims9
A metal forming apparatus, comprising:
- a first portion for accepting a metal workpiece;
- a second portion for cutting a female lock seam notch in said workpiece;
- a third portion for bending said workpiece with said female lock seam notch into a female lock seam;
- a fourth portion for forming duct connection flanges in said workpiece;
- and
- a male seam forming portion, said male seam forming portion manipulating said workpiece to define a male lock seam at a position in said metal forming apparatus that is downstream of said first portion, said second portion and said third portion.
A method of forming a duct from a metal workpiece via a metal forming apparatus, said method comprising the steps of:
- providing said metal workpiece to said metal forming apparatus;
- defining a flange formation portion of said metal formation apparatus to form connecting flanges of said duct in said metal forming apparatus;
- and
- forming a male lock seam in said metal workpiece, said formation of said male lock seam occurring downstream of said flange formation portion of said metal forming apparatus.
A metal forming apparatus, comprising:
- a first portion for accepting a metal workpiece;
- a second portion for cutting a female lock seam notch in said workpiece, said second portion being oriented downstream of said first portion;
- a third portion for bending said workpiece with said female lock seam notch into a female lock seam, said third portion being oriented downstream of said second portion;
- a fourth portion for forming duct connection flanges in said workpiece, said fourth portion being oriented downstream of said third portion;
- and
- a male seam forming portion, said male seam forming portion manipulating said workpiece to define a male lock seam, said male seam forming portion being oriented downstream of said third portion.
Dependencies are inferred from the claim text.