Fire escape – ladder – or scaffold – Ladder – Flexible
Patent
1986-08-29
1987-04-07
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder
Flexible
181 46, 181228, E06C 156
Patent
active
046553215
ABSTRACT:
A rope ladder of the type having a series of ladder steps and two spaced-apart pairs of ropes. Each step has a metal step frame about which is molded a hard elastomer body. Each step has a rope-receiving opening therethrough shaped and sized for closely confining a pair of ropes. Each step has a pair of horizontal transverse openings therethrough parallel to each other on each side of each rope-receiving opening. Before molding, nylon tubes are inserted in each end of each transverse opening and held during molding by slug bolts. After molding, the steps are each cut, on one side only, to provide a main step portion and two separate gripping portions, one for each rope-receiving opening, and each incorporating a portion of the frame and a portion of the body, the gripping portions including a portion of each transverse opening. A bolt is inserted through each pair of aligned nylong tubes, extending through both the main step portion and each gripping portion. A nut is loosely placed on each bolt. The ropes are then threaded through the through openings of the steps. The nuts of the bottom step are tightened. Then the ropes are placed in tension and that step tested. Next the nuts are fully tightened for clamping each gripping portion to the main step portions of all the other steps, to clamp the ropes in each rope-receiving opening. Finally, the tension on the ropes is released.
REFERENCES:
patent: 3415341 (1968-12-01), Hostetler
patent: 4177878 (1979-12-01), Salvarezza
patent: 4241809 (1980-12-01), Salvarezza
patent: 4442920 (1984-04-01), Gronbeck
patent: 4554996 (1985-11-01), Salvarezza
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