The Chicago Steel Box and Pan Brake will form a box or pan out of one piece of metal, including four sides and bottom. Provisions are also made for narrow flange on the top of a box, which can be turned either in or out, which is done in the manufacture of electric switch boxes. These brakes are popular in the manufacture of signs.

The flanges are adjustable and removable, which perimeter any size box or pan to formed within the capacity of the brake. After both sides of the box are formed, these sides fit in between the fingers adjusted to the width of the box.

Below Illustrates a steel box formed ion one piece on the Steel box and pan brake.

Figure A represents the layout of the sheet metal before being formed. Bends are first made on 1 2 3 and 4. These bends forma small flange which is sometimes used for attaching hinges for covers, etc. The illustration shows the flanges turned in, but they can be turned in or out.

Bends then are made on line 5 and 6, which form the sides of the box. This operation also forms the ears or riveting flanges.

The brake fingers are adjusted to the width of the box and the sheet is bent on line 7. In making this operation the sides of the box pass between the fingers, and figure B shows the box after the bend is made.

The box is then reversed and bent on line 8. The sides again pass between the fingers and the box is completely formed as shown in figure cx.