Extendable / retractable ladder
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United States of America Patent
Stats
-
Aug 21, 2018
Grant Date -
Jan 11, 2018
app pub date -
Sep 22, 2017
filing date -
Aug 22, 2008
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An extendable/retractable ladder assembly includes a first stile and a second stile and a plurality of rungs extending therebetween. Each stile may comprise a plurality of columns disposed in a nested arrangement for relative axial movement in a telescopic fashion. A connector assembly connects the rungs to respective columns in the first and second stiles. The ladder has improved manufacturability since connector assemblies may be assembled before connecting the rungs to respective columns. The standing surface of the rungs may be angled such that it is rotated towards horizontal when the ladder assembly is leaned against a wall. A latch assembly may be used to selectively lock relative axial movement between adjacent columns. The latch assembly includes a locking pin assembly comprised of a central post and an outer metal sleeve. An air damper may also be used to control airflow through the columns.
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