Fire escape – ladder – or scaffold – Ladder – Supporting surface compensating means
Patent
1991-01-02
1991-12-24
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
Supporting surface compensating means
182166, 182209, E06C 744
Patent
active
050743783
ABSTRACT:
A ladder with extendible legs that may be individually and selectively, secured in the desired extent of protraction by a relatively uncomplicated locking mechanism. The locking mechanism may be incorporated in a ladder having at least a pair of support legs with an extension leg carried by, and slidable axially along, each support leg. A reaction surface is presented from each support leg. A pair of locking cam surfaces is also presented from each support leg. The locking cam surfaces are disposed in spaced opposition to each reaction surface. An engaging plate is presented from each of the extension legs. The engaging plate is slidably interposed between the reaction surface and the opposed locking cam surfaces. A locking member is, in turn, operatively disposed between the engaging plate and the opposed locking cam surfaces. Each locking member is movable along at least one of the locking cam surfaces selectively to wedge the engaging plate against the reaction surface in order axially to secure the extension leg at the desired position along the axial extent of the support leg. The locking member is also movable selectively to release the extension leg for axial movement along the support leg. A linking mechanism is provided to control movement of the locking member in order selectively to secure or release each extension leg for retraction and/or protraction.
REFERENCES:
patent: 2366829 (1945-01-01), Biery
patent: 3374860 (1968-03-01), Stewart
patent: 4014406 (1977-03-01), Easton
patent: 4155422 (1979-05-01), Larson
patent: 4627516 (1986-12-01), Studer
Kaddi Corporation
Machado Reinaldo P.
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