Extension ladder pulley system

Details Extension ladder pulley system Extension ladder pulley system

1994-12-07

1996-12-10

Chotkowski, Karen J.

Fire escape, ladder, or scaffold

Ladder

Supporting surface compensating means

182228, E06C 700

Patent

active

055822703

ABSTRACT:
An improved replacement ladder rung/pulley construction is disclosed wherein a rotatable rod, mounted on bearings and extending substantially completely from one side of the ladder wall to the other, is located within the rung. The rung has a cutout portion proximate its center, which allows a rope to be passed therethrough and over the rotatable rod. The rod thus functions as a pulley and obviates the possibility of the rope sliding off and becoming jammed if the pulling force is exerted from one side or the other.

REFERENCES:
patent: 470515 (1892-03-01), Skeels
patent: 659667 (1900-10-01), Harmon et al.
patent: 1101359 (1914-06-01), Thompson
patent: 1582793 (1926-04-01), Smith et al.
patent: 1651478 (1927-12-01), Skeels
patent: 2265735 (1941-12-01), Lambert
patent: 2989141 (1961-06-01), Howard
patent: 3208554 (1965-09-01), Arnold
patent: 3369630 (1968-02-01), Rich
patent: 3495684 (1970-02-01), Homery
patent: 3935926 (1976-02-01), Butler

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