Ladder jack

Details Ladder jack Ladder jack

1980-03-13

1981-12-22

Machado, Reinaldo P.

Supports

Brackets

Specially mounted or attached

182117, 182121, E04G 506

Patent

active

043067000

ABSTRACT:
In the art of scaffolding, temporarily utilizing elevated planks, stages or platforms for supporting workmen and materials through use of two or more leaning ladders, a compact ladder jack has a tubular, scaffold-supporting arm for storing a suspension chain when not in use. The arm hooks over a ladder rung and the chain is looped over a higher rung. The chain has a snap hook for receiving a preselected chain link to permit mounting of the jack in a position where the arm is disposed horizontally to accommodate variances in ladder inclinations. A latch on the arm guards against accidental displacement of the hook end of the arm from the lower rung.

REFERENCES:
patent: 524270 (1894-08-01), Wimbush
patent: 1187437 (1916-06-01), Lucas
patent: 2151135 (1939-03-01), Moberg
patent: 2895660 (1959-07-01), O'Keefe
patent: 2936989 (1960-05-01), Siek
patent: 3899045 (1975-08-01), Geisel

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