Door structure for agricultural buildings - uses box units of various shapes with bent, arcuate or folded surfaces

摘要

The push-door is for halls or agricultural buildings, and can be with or without a lower or upper guide, and suspension. It is in fact composed of assemblable box-shaped units. These boxes are formed as folding parts, and are individually attached to one another along their edges. The boxes are made from stamped and/or folded sheet, and can be triangular quadratic or hexagonal in shape. Their main surfaces are bent, arched or slightly folded along crossed lines, and have a rear side attached to them which contains recesses.