| 摘要 |
<p>A builders prop or a fitment for a prop comprising a head plate which is connected to the prop body, or to a base plate to be secured to a standard prop head plate by a shank, the shank carrying both a support tube which is slidably and rotatably engaged over the shank, and a shuttering element support member, the support tube or shank being formed with an angularly inclined surface to engage a member extending from the shank or tube respectively, the arrangement being such that rotation of the support tube around the shank raises or lowers the support tube relative to the head plate, the shuttering element support member being so shaped and arranged as to be supported by the support tube relative to the shank and in a second angular or "strip" position of the support tube around the shank, the shuttering element support member being free to slide down the shank away from the head plate.</p> |
