Fire escape – ladder – or scaffold – Wall- or floor-attached – Independent rung or step
Patent
1987-11-13
1988-07-05
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Wall- or floor-attached
Independent rung or step
182100, 182189, 2482171, 248246, E06C 708
Patent
active
047548410
ABSTRACT:
This invention is a simple to make, simple to use, inexpensive step for use on rectangular wooden posts, such as those used in scaffolds. This step has a u shaped body with a portion that encompasses the posts, two "grips" in this portion which bite into the wood to keep the step in place, and a part to step upon. To move this step to a desired position, the part that is stepped upon is tilted up and out from the horizontal. This motion causes the two grips to disengage from the post and to be sufficiently removed from the post to allow the step to slide freely on this post. The step is fabricated from a single sheet of metal that is cut and bent to the desired design.
REFERENCES:
patent: 141498 (1873-08-01), Edmonston
patent: 472514 (1892-04-01), Sankey
patent: 789843 (1905-05-01), Dennis
patent: 1098945 (1914-06-01), Frederick
patent: 1153371 (1915-09-01), Carter
patent: 1597095 (1926-08-01), Martinsen
patent: 2086280 (1937-07-01), Matter
patent: 3166868 (1965-01-01), Prozeller
patent: 3561563 (1971-02-01), Harsh
patent: 3710734 (1973-01-01), Bofferding
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