| 摘要 |
1. An expandable load bearing device the particular value whereof, in the context of a ladder, is to compensate for uneven ground when positioning a ladder for traditional sloping usage or in a vertical plane for the ladder forming part of a lightweight access scaffold; also usable on access towers, tables, easels etc. 2. Extension of the use of the load bearing device into ladder stabilisation arms; 3. Lockability of a ladder stabiliser in both deployed and stowed configurations, with the stowed configuration as unobtrusive as possible; 4. A stabiliser tie which is automatically foldable into an unobtrusive configuration upon stowage of the stabiliser; 5. Incorporation of a secondary tie for use when the stabilisers are, due to ground slope, exceptionally different in length so as otherwise to cause unequal resistive forces to the ladder; 6. A safe/unsafe ladder slope warning indicator; 7. A safe/unsafe stile/stabiliser extension indicator; and 8. A metal extrusion with sockets for bearing material. |
