Tree step

Details Tree step Tree step

1991-01-28

1992-02-11

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Wall- or floor-attached

Independent rung or step

182189, A63B 2700

Patent

active

050868730

ABSTRACT:
A tree step including a steel rod bent into a configuration including an elongated central portion and a pair of perpendicularly oriented right triangular shaped portions extending perpendicularly from the central portion with one leg of each right triangular shaped portion being at opposite ends of the central portion and lying in parallel planes forming a pair of spaced apart 90 degree orientated steps.

REFERENCES:
patent: 3283852 (1966-11-01), Merz
patent: 3598201 (1971-08-01), Thurmond
patent: 3712418 (1973-01-01), Currence
patent: 4027742 (1977-06-01), House
patent: 4249635 (1981-02-01), West
patent: 4263983 (1981-04-01), Norton
patent: 4265333 (1981-05-01), Rowell
patent: 4422527 (1983-12-01), Schultz
patent: 4618028 (1986-10-01), Dale
patent: 4620610 (1986-11-01), Southard
patent: 4674597 (1987-06-01), Humphrey

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