Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
EXTENDABLE/RETRACTABLE LADDER
An extendable/retractable ladder assembly (100) includes a first stile (104) and a second stile (106) and a plurality of rungs (118,120,150) extending therebetween. Each stile comprises a plurality of columns (108,110,112,114) disposed in a nested arrangement for relative axial movement in a telescopic fashion. A connector assembly (116) connects the rungs to respective columns in the first and second stiles. The standing surface of the rungs is angled betwenn about 5 and 45 degrees such that it is rotated towards horizontal when the ladder assembly is leaned against a wall. The connector assembly has a rung portion with an upper surface (152) generally parallel with the generally planar standing surface such that the rung portion establishes the angel of the planar standing surface of the respective rung.
EXTENDABLE/RETRACTABLE LADDER
An extendable/retractable ladder assembly (100) includes a first stile (104) and a second stile (106) and a plurality of rungs (118,120,150) extending therebetween. Each stile comprises a plurality of columns (108,110,112,114) disposed in a nested arrangement for relative axial movement in a telescopic fashion. A connector assembly (116) connects the rungs to respective columns in the first and second stiles. The standing surface of the rungs is angled betwenn about 5 and 45 degrees such that it is rotated towards horizontal when the ladder assembly is leaned against a wall. The connector assembly has a rung portion with an upper surface (152) generally parallel with the generally planar standing surface such that the rung portion establishes the angel of the planar standing surface of the respective rung.
EXTENDABLE/RETRACTABLE LADDER
AUS- UND EINZIEHBARE LEITER
ÉCHELLE EXTENSIBLE ET RÉTRACTABLE
KIEFFER MITCHELL I (Autor:in) / CALDWELL ALLEN A (Autor:in) / SCHLUETER NATHAN L (Autor:in) / DECKER MATTHEW J (Autor:in)
22.07.2020
Patent
Elektronische Ressource
Englisch
IPC:
E06C
LADDERS
,
Leitern