| 摘要 |
<p>The invention comprises a platform deck 2 incorporating a guardrail assembly 12 and 14 with rotatable, linked, spring-return hooks (22 Fig 3), which are fitted into a scaffolding tower to provide a 'safe working place' on the scaffold, which can then be re-positioned further up the tower as construction progresses by raising each end of the deck in turn causing the hooks (22 Fig 3) to automatically disengage from the structure and pass any obstructing frame members and which then can then be lowered onto the correct rung position automatically. Although the deck is free to be raised at each end without restriction, the deck cannot be over-turned by sideways rotational forces applied to the handrails or deck since each linked set of four hooks always remain parallel to each other preventing lateral rotation of the deck assembly. Decks may incorporate trap-door access hatches to gain safe access through the deck on narrow tower structures. For transportation and storage, the hand rails may be removed and the advance guardrail assembly folded compactly.</p> |
