| 摘要 |
A ladder 110 for use as a fire escape has two stiles 112 comprising telescopically collapsible tube sections, a plurality of rungs 114 each secured to the upper end of two tube sections, each of the two sections being part of a respective one of the two stiles, and retractable spring- biased pins 116 supported by the lateral ends of the rungs 114 and engageable in holes 120 in the walls of the tube sections to lock the tube sections to one another in the extended state of the ladder. The ladder 110 is capable of being suspended from the uppermost tube sections 112a of the stiles and the holes 120 in the walls of the tube sections in which the sprung pins 116 are engageable are dimensioned to allow free play between the pins and the holes in at least the axial direction of the tubes. |
