Extendible safety posts for manhole ladders

Details Extendible safety posts for manhole ladders Extendible safety posts for manhole ladders

1998-01-27

1999-08-03

Chin-Shue, Alvin

Fire escape, ladder, or scaffold

Wall- or floor-attached

Ladder

182 97, 182106, E06C 718

Patent

active

059312580

ABSTRACT:
A retractable safety post for facilitating access in and out of a manhole is slidably attached to each side rail of a wall-mounted ladder. Each post slides within a tubular sleeve fixed to the side rail and is selectively movable between a retracted or stowed position to an extended or use position. Each post has at its upper end a cap and handle for ease of grasping during use, and at its lower end a latch member for securing the post in its extended position during use. A wall bracket anchoring the ladder to the manhole serves as a resting support for the latch member and its post when in the extended position. The post is secured in the extended position by merely lifting the post, twisting the post a given amount in a pre-set direction, and lowering the post slightly so that the latch member can engage the wall bracket. In its stowed position, the post rests wholly within the manhole.

REFERENCES:
patent: 1916208 (1933-07-01), Diou
patent: 3136384 (1964-06-01), Sweeney
patent: 3455414 (1969-07-01), Higgins
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patent: 3908791 (1975-09-01), Kleine et al.
patent: 4111280 (1978-09-01), Devine et al.
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patent: 4252214 (1981-02-01), Miller
patent: 4269284 (1981-05-01), Swager
patent: 4546855 (1985-10-01), Lyons
patent: 5282339 (1994-02-01), Devlin

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