| 摘要 |
A joining device comprises a cylindrical bar with a projecting pin at one end and two rigid bodies having cylindrical holes and channels for accomodating the bar and the pin. The two rigid bodies are first attached to elements to be joined. Insertion of the bar into the holes and subsequent rotation of the bar causes the two bodies and thus the two elements to be retained together. In a preferred case, the two elements are urged together because the far edge of the second body to be entered has a sloping edge which is a cam surface against the projecting pin. The joining device may be used in fencing particularly for surrounding temporary winter rinks. Erection and disassembly of such rinks is thus hastened.
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