A method of forming a duct section from a web of material includes the steps of forming a series of perforations in a web of material, the series of perforations defining an outline of one of a hole or notch in a finished duct section, forming a male lock bend and a female lock seam in first opposed edges of the web of material, forming flanges in second opposed edges of the web of material, removing the portion of material interior to the series of perforations to form the hole or notch, and bending the web of material to form the finished duct section.

A method of forming a duct section from a web of material includes the steps of forming a series of perforations in a web of material, the series of perforations defining an outline of one of a hole or notch in a finished duct section, forming a male lock bend and a female lock seam in first opposed edges of the web of material, forming flanges in second opposed edges of the web of material, removing the portion of material interior to the series of perforations to form the hole or notch, and bending the web of material to form the finished duct section.

A sliding machine includes: at least one slide fixed to side parts on an upper surface of a main chassis, a second form roller unit positioned to move horizontally on the slide and located between a first form roller unit and a third form roller unit, a servo motor, two spindles of motion that transmit the motion drive to the rollers in a first form roller group, a second form roller group and a third form roller group through the wedge channel formed from one end to the other, at least one motion spindle gear fixed to the end of the spindle of motion, a motor which gives the driving power to the spindle of motion, a reducer positioned on the output shaft of the motor, at least one reducer gear sequentially fixed on the output shaft of the reducer and two sheet metal moving rails.

Apparatus and methods are described for automatically closing the seam of duct work and for automatically inserting angle plates into duct work and then closing the seam of the duct work. The seam closing apparatus includes a first seam closing members for closing the top and bottom portions of the seam and a second seam closing member for closing the remainder of the seam of the duct work.

Apparatus and methods are described for automatically closing the seam of duct work and for automatically inserting angle plates into duct work and then closing the seam of the duct work. The seam closing apparatus includes a first seam closing members for closing the top and bottom portions of the seam and a second seam closing member for closing the remainder of the seam of the duct work.

Apparatus and methods are described for automatically closing the seam of duct work and for automatically inserting angle plates into duct work and then closing the seam of the duct work. The seam closing apparatus includes a first seam closing members for closing the top and bottom portions of the seam and a second seam closing member for closing the remainder of the seam of the duct work.

Apparatus and methods are described for automatically closing the seam of duct work and for automatically inserting angle plates into duct work and then closing the seam of the duct work. The seam closing apparatus includes a first seam closing members for closing the top and bottom portions of the seam and a second seam closing member for closing the remainder of the seam of the duct work.

The present disclosure relates to a mesh container and a method of making a mesh container that has a first and a second set of opposing side panels, a bottom panel, and a rim directed outwards from the upper edges of the side panels. At least two adjacent sides panels of the container and portion of the rim directed outwardly from the upper edge of the side panels are made from a sheet metal precursor with least one perforated and a stretched portion and unstretched metal portion. The precursor is folded so that the unstretched metal portion joins the two side panels and is bent to form the rim. A notch is cut from the edge of the unstretched metal portion where it is bent at the corner formed by the two side panels.