Importance

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Abstract

A connector structure for connecting together a plurality of elongated frame bars at their ends includes a main part having three side walls with mutually perpendicular quadrangular outer surfaces and a cover piece also having three side walls with mutually perpendicular outer surfaces such that they together assume a cubic form when they are attached to each other in a closed relationship with an engagement member on the inner surfaces of the three walls of the main part and a protrusion on the cover piece engaged to each other. Each side wall of the main part is provided with a throughhole for passing a screw through such that it can be attached to end surface of a frame bar. Such main part is produced by using only two mold pieces, an upper molding piece with a convex part and a lower molding piece with an indentation. The indentation has three inner surfaces, each making a same angle to the vertical direction. Each of the screw-passing throughholes is formed by two small hole-forming protrusions, one protruding vertically downward from the convex part of the upper molding piece and the other protruding vertically upward from one of the sloped inner surfaces of the lower molding piece. Each hole-forming protrusions have a vertical wall such that a pair of upward and downward protrusions can be put next to each other.

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First Claim