| 摘要 |
A rung-foldable ladder device for attaching to an upright structure for climbing thereupon. The rung-foldable ladder device includes an elongate tubular support member; and also includes a plurality of bracket members being securely attached to the elongate tubular support member and being adapted to removably fasten with straps about an upright structure; and further includes a plurality of rung members being pivotally attached to the elongate tubular support member; and also includes a cable being attached to the rung members for pivoting the rung members against the elongate tubular support member.
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