| 摘要 |
PROBLEM TO BE SOLVED: To provide square pipe joint parts capable of easily assembling and disassembling a frame of the furniture and the like with a small number of parts without needing skill. SOLUTION: A main block 4 is formed by forming square recessed parts 2 on each face 1' of a hexahedron 1, and forming a female screw hole 3 toward an inner part of the hexahedron 1 inside of each recessed part 2. A square projecting part 5 fitted to the square recessed part 2 is formed on one end outer face 6' of a hollow arm block 6, a through hole 7 corresponded to the screw hole 3 is formed on one end part, a bolt head 8' is rotatably engaged with one end inner face 6a, and a bolt 8 is screwed in the screw hole 3 through the through hole 7. One end outer peripheral four sides 6" are arranged at intervals r in parallel inside of outer peripheral four sides 1" of each face 1', and the main block 4, the hollow arm block 6 and the bolt 8 can be assembled and disassembled.
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