Patent · US Active

Ergonomic extendable/retractable ladder

US8387753B2 · kind B2 · utility

12Cited by

38References

11Claims

0Family size

Assignee

Core Distribution, Inc. · US

Inventors

Mitchell I. Kieffer · Minneapolis, US
Craig S. Aizman · St. Louis Park, US
Bruce A. Hillukka · Hanover, US
Michael J. Kelly · Seattle, US
Wayne A. Shakal · Shafer, US

Key dates

Filing date	Jun 30, 2006
Grant date	Mar 5, 2013
Priority date	—
Expiry date	May 22, 2029

Classification

Technology area (CPC E)Fixed Constructions
CPC primaryE06C1/125
WIPO fieldCivil engineering
WIPO sectorOther fields

Abstract

An extendable/retractable ladder assembly includes a first column and a second column, the first column nesting in the second column, and a first rung coupled to, and extending from the second column. A ladder assembly bracket includes a collar portion, which extends about the second column, and a rung portion, which extends from the collar portion into the first rung. The collar portion may be gripped by a hand of an operator in order to position a thumb of the hand in engagement with a button to retract a locking pin of a latch assembly mounted within the rung portion of the bracket.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.