| 摘要 |
<p>The scaffolding vertical riser (3a,3b) have sockets (5) on its periphery parallel to the axis while the connection bars (6b) between risers have a fixing at their ends. This is a head (8) with two parallel and horizontal wings (9) with an opening in each (10) for the passage of a key pin (12), the key pin section increasing upwards so that one part of it bears on the socket interior face. The wings are profiled to a circular shape of the same diameter as the associated socket, so that the wings do not bear onto the corresponding riser.</p> |
