| 摘要 |
<p>A portable, extensible ladder is disclosed of the type having a plurality of sections sliding into each other. The normally uppermost section is provided with hook for suspending the ladder from a window sill or the like. The sane, normally upper section is provided with winch and brake means for controlling the extension of the ladder by gravity by operating same from the top end thereof. The lowermost section is provided with support wheels facilitating the manipulation of the ladder over obstructions such as a lower window sill or the like as the ladder is being extended. The ladder also has means for locking same in an extended state, whereby the ladder becomes generally rigid to facilitate handling from the bottom end. The ladder is particularly suitable as a portable fire escape ladder but has many other applications as well.</p> |
