Safety ladder

Details Safety ladder Safety ladder

1990-01-22

1991-02-26

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

Supporting surface compensating means

2481884, E06C 744

Patent

active

049954741

ABSTRACT:
A safety ladder is disclosed. The safety ladder comprises at least two legs each of which containing a smooth longitudinal blind bore, a steel hollow pipe having an outer surface and being smoothly disposed in the longitudinal blind bore while providing additional strength to the at least two legs, a rod disposed concentrically in the steel hollow pipe and vacillating up and down therein without any hindrance so that its ease of operation is increased, a solid piece of steel drilled and tapped so as to contain a throughbore that will accommodate the steel hollow pipe, and a flat steel plate affixed to the solid piece of steel and containing a skewly drilled hole so that the skewly drilled hole lines up with the outer surface of the steel hollow pipe.

REFERENCES:
patent: 332684 (1885-12-01), Tuttle
patent: 2213471 (1940-09-01), Minnick
patent: 2318017 (1943-05-01), Schmidt
patent: 2584015 (1952-01-01), Hawes
patent: 3791487 (1974-02-01), Baumann

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