| 摘要 |
<p>PURPOSE:To reduce an occupied space as well as to facilitate a job for piping work by connecting plural rectangular plastic faceplate parts in a sheet-form at bending part, forming a connecting part in both the end edges, and forming a cross section polygonal cylindrical body in the faceplate part after bending it at the bending part, in the duct of a building. CONSTITUTION:Six sheets of a rectangular faceplate 2 are connected free of bending with one another at a bending part 3, forming a platelike blank. Each of connecting parts 4 and 4 is installed side edges of the faceplate parts 2, 2 at both ends of this blank. Each faceplate 2 is bent by the bending part 3, forming it into a hexagonal cylindrical form, and then these connecting parts 4, 4 are connected to each other, forming a hexagonal cylindrical duct 1. Those of faceplate part 2, bending part 3 and connecting part 4 are formed by means of extrusion molding of hard plastic material. In this bending parts 3, a trapezoidal recess groove is formed in an inner surface of the plastic sheet, leaving a thin hinge part left behind, and it is made up of forming a soft plastic cushion layer on the inner surface of the recess groove.</p> |
