| 摘要 |
An insert for use in forming a releasable locked joint between a hollow rectangular tubular member and a cubical connector which has at least two spigots of rectangular cross section. The insert fits into the tubular member and has a spigot locking portion at each corner, which bridges the corner of the tubular member to provide a void or cavity in each corner. The locked joint is established by inserting the spigot into the insert and then turning the tubular member one-eighth to bring the spigot corners into an interference fit with the spigot locking portions.
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