| 摘要 |
A coupling device consisting of a pair of identical one-piece units adapted to be placed into and out of interlocking engagement. Each unit includes a cylindrical first member, a second member extending above the first member, and a pair of third members extending above the first and second members, the upper surfaces of these members being planar and parallel. An opening extends through the first and second members. The second member is formed with a pair of spaced inwardly extending recesses and includes a plurality of spaced first locking elements each of which is positioned to a side of corresponding recess. Each first locking element has a lower surface spaced from the upper surface of the first member and inclined downwardly in a direction away from the corresponding recess. Each third member includes a second locking element projecting over and above the second member and having a lower surface that is spaced from the upper surface of the second member and is inclined downwardly from each end.
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