Molded hard elastomer steps and replacement and spreader steps f

Details Molded hard elastomer steps and replacement and spreader steps f Molded hard elastomer steps and replacement and spreader steps f

1986-08-04

1987-08-04

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

Flexible

182 46, 182228, E06C 156

Patent

active

046839810

ABSTRACT:
A rope ladder of the type having two spaced-apart pairs of ropes, has a metal frame for each step and has tubular nylon members with cylindrical bores, extending vertically through sets of through openings in the metal frame for assuring accurate bolt alignment. The frame and nylon members are provided with a molded hard elastomer body molded around them and having a collar portion at each end molded around a frame bracket. The body and frame provide a through rope opening. A pair of separate wedge collars is secured, on assembly, to each step, below the step and bearing up against it. Each wedge collar has a rope opening and vertical bolt passages aligned with the bores of the tubular nylon members. A generally diamond-shaped wedge heart is placed in between each pair of ropes, in the rope openings; the wedge heart provides two rope-engaging side grooves for locking the pair of ropes in place and preventing relative movement between them and the step. Fastening bolts extend through bolt passages and the bores of the nylon members and are tightened in place to hold the wedge collar and wedge heart in place and lock the ropes in fixed position relative to said step. The molding is done with the frame inverted, the nylon members having a flange and a spacer for spacing the frame in the to-be-molded body; the nylon members extend to the opposite surface of the body. Pins of the mold extend into each end of each nylon member and assure accurate alignment. Similar nylon members are used in replacement steps in connection with horizontal bolts. An improved spreader step is also provided.

REFERENCES:
patent: 4241809 (1980-12-01), Salvarezza
patent: 4554996 (1985-11-01), Salvarezza

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