| 摘要 |
<p>Two or more side ladders (1,2) one or more boards at intervals above each other, struts, cross-boards and other components, as appropriate, make up a scaffolding frame. The frame is esp. of the travelling type.All the components are held together by connecting, bolting and adjusting media, of shapes and dimensions enabling them to be erected, dismantled and activated by one person working alone. Ladders may be divided into sections, while connectors for their tubular stringers are narrow-dia. pipe sockets, fastened to the tops, for sliding into the bottoms of the next sections. Claws can connect boards and struts</p> |
