| 摘要 |
PROBLEM TO BE SOLVED: To provide a floor joint device safely usable, inexpensive, and easily settable without enlarging a joint plate, or falling the joint plate to a joint part even when extending the joint part. SOLUTION: This floor joint device comprises a joint plate support part formed at the tip of one floor skeleton protruded outward; a joint plate supporting recessed part having an inclined surface on anti-joint part side, which is formed on the joint part upper part of the other floor skeleton provided through a crank-like joint part to the one floor skeleton; a joint plate having a rear end supported by the joint plate support part and a tip part for covering the joint plate support recessed part supported rotatably upward; and a joint plate support mechanism for supporting the part closer to the tip part of the joint plate on a floor surface within the joint part of the other floor skeleton, which is mounted on the other floor skeleton or the one floor skeleton to be expansible and contractible.
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