| 摘要 |
A joint-and-beam platform structure is disclosed, which is dismountably built by coupling resin-coated metal beams or members with synthetic-resin joints having hollow sleeves into which ends of the beams are inserted to form a square or rectangular framework. Each joint comprise a pair of first and second sleeves, formed to extend at predetermined angles with each other, each of a cross-section largely shaped like the alphabet "B" to fittingly but removably receive therein a tubular beam of a similarly B-shaped cross-section. The tubular beams are each provided with screw holes in the middle of their curved circumferences to receive screws through aligned screw holes formed in the associated hollow sleeves of the joint. When the tubular beams are inserted into position in the sleeves, the screws are removably engaged through their screw holes into internally threaded holes of a nuts plate that are shaped to follow the contour of the outside periphery of the sleeve and fitted against the outer wall of the sleeve at a point where the twin bulges of the sleeve of B-shaped cross-section slope into a trough between them. The nuts plate may preferably be made to have a wide abutting face so that, when it is pressed against the outer wall of the sleeve, it can closely straddle a wide area of the latter's doubly curved circumference, providing stout engagement.
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