Automatic levelling and locking ladder

Details Automatic levelling and locking ladder Automatic levelling and locking ladder

1977-12-07

1978-12-05

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

Supporting surface compensating means

2481883, E06C 744

Patent

active

041281390

ABSTRACT:
In a self levelling ladder base of the type wherein each leg of the base has a rack and pinion assembly, the pinions being interconnected by a shaft, and a tab interfering with the pinions to prevent their rotation as weight is placed on the ladder, automatic locking means are provided to retain the tab in interfering engagement subsequent to the weight being removed, thereby increasing the operational safety of the ladder.

REFERENCES:
patent: 2451113 (1948-10-01), Ozols
patent: 2894670 (1959-07-01), Anderson
patent: 3805917 (1974-04-01), Luther
patent: 3878918 (1975-04-01), Basile

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