| 摘要 |
A telescopic loft ladder is disclosed two stiles (16) each comprising sections (16a, 16b, 16c...) that are telescopically collapsible within each other, rungs (12,14) having two lateral ends each connected to a section of a respective one of the stiles (16), retractable pins (30) in the ends of the rungs (12,14) for engaging in holes in the sections (16a, 16b, 16c...) of the stiles to retain the stile sections in an extended position, and levers (34) on the rungs (12,14) that are automatically operated when two rungs (12,14) contact one another to disengage the pins (30) of the upper of the two contacting rungs (12,14) from the holes in the stiles to permit the collapse of the next higher rung. The uppermost section (16a) of each stile is rotatable relative to the section (16b) connected to the uppermost rung (12) of the ladder and has pin receiving holes (16d, 16e, 16f) that are circumferentially and axially offset from one another. At least one resilient element (50) is provided for biasing the next to uppermost rung (14) away from the uppermost rung (12) to ensure that the locking pin of the uppermost rung (12) engages within a hole in the uppermost stile section (16a) as the ladder (10) is being lowered. |
