Ladder working limit based ladder stopping device for aerial lad

Details Ladder working limit based ladder stopping device for aerial lad Ladder working limit based ladder stopping device for aerial lad

1974-12-23

1976-06-08

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Automatic control

212 39A, 214764, 182 2, B66F 1104

Patent

active

039616851

ABSTRACT:
There is provided a ladder working limit based ladder stopping device for a vehicle equipped with a vertically and horizontally swingable and extensible ladder (or a fire engine truck), wherein a working limit of the ladder is preset on the basis of an extended length of the ladder corresponding to a particular vertical angle assumed by the ladder, so that when the combined situation of the vertical angle and extended length of the ladder reaches said preset condition, the operating mechanism for the ladder is automatically returned to its neutral position while actuating a warning device and turning on a marker lamp, the operating mechanism being then operated toward the safety side, whereupon the marker lamp is turned off to indicate that the ladder is now safe.

REFERENCES:
patent: 2772411 (1956-11-01), Cooper
patent: 3122125 (1964-02-01), Towne
patent: 3223249 (1965-12-01), Cady
patent: 3566386 (1971-02-01), Hamilton
patent: 3680714 (1972-08-01), Holmes
patent: 3740534 (1973-06-01), Kezer

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