Retractable ladder

Details Retractable ladder Retractable ladder

2009-08-11

2011-11-15

Shue, Alvin Chin (Department: 3634)

Fire escape, ladder, or scaffold

Ladder

Slidable nested single rung units

C182S209000

Reexamination Certificate

active

08056679

ABSTRACT:
A retractable ladder includes telescoping rail sections each having left and right side rail members. Each side rail member has two aligned locking holes. A control device includes a shaft disposed rotatably between the side rail members of one of the rail sections, and two locking units each having a controlled piece fixed to and rotatable along with the shaft, two abutment plates, two locking pins, and two spring members biasing the abutment plates to abut respectively against two opposite sides of the controlled piece. The controlled piece is rotatable between a pushing position to push the locking pins to project outwardly from the locking holes in said one of the rail sections and engage respectively the locking holes in the adjacent rail section, and a non-pushing position, where the locking pins are permitted to extend inwardly so as to disengage from the locking holes in the adjacent rail section.

REFERENCES:
patent: 2194856 (1940-03-01), Kostuk
patent: 2827216 (1958-03-01), Napolitano
patent: 2975857 (1961-03-01), Suroff et al.
patent: 4989692 (1991-02-01), Min
patent: 5738186 (1998-04-01), Jones
patent: 7316293 (2008-01-01), Yao et al.
patent: 2009/0065304 (2009-03-01), Jian
patent: 2010/0044155 (2010-02-01), Kieffer et al.

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