umbrella bone structure for a single type bevel surface

摘要

PROBLEM TO BE SOLVED: To provide an umbrella rib structure for one piece umbrella fabric.;SOLUTION: Generally, the stretching condition of the umbrella fabric is not considered to arrange an umbrella rib structure, and, with the one-piece umbrella fabric, unfolding and folding of the umbrella become difficult. Since then, in the umbrella rib and umbrella fabric structure, a reference line is formed along a diagonal direction of a yarn square frame or a warp direction and a weft direction of yarns of the one-piece umbrella fabric in a center of a middle rod. At least four main umbrella ribs are arranged on the reference line or arranged symmetrically around the reference line. The outer ends of the main umbrella ribs and the outer edge of the umbrella fabric are connected. The main umbrella ribs are arranged on the basis of the reference line, so that the umbrella ribs can be supported effectively according to a structural form of the one-piece umbrella fabric to form an arc-shaped ceiling formed after an umbrella is unfolded, namely an umbrella shape, and the umbrella ribs and the umbrella fabric can be folded effectively after the umbrella is folded.;COPYRIGHT: (C)2013,JPO&INPIT