Fire escape – ladder – or scaffold – Ladder with pivoted prop – Single rear prop – pole type
Patent
1977-05-25
1978-12-19
Machado, Reinaldo P.
Fire escape, ladder, or scaffold
Ladder with pivoted prop
Single rear prop, pole type
182107, E06C 120
Patent
active
041301811
ABSTRACT:
A support strut arrangement for use with a ladder extends from the ladder in load transfer relation with the ground, having lost motion provision to accept a predetermined extent of bowing of the ladder under the weight of a user before the load strut becomes effective, so that the top ends of the ladder may be in substantially unrestricted pressing relation against the supporting wall or other object, thereby permitting the development of substantially maximum friction forces tending in normal use to maintain the tip of the ladder in its propped position. In the event that the foot of the ladder slips out the lost motion, in the form of an extensible tension member or of a strut which can shorten its effective length, is taken up and substantially rigid triangulation of forces is established. This force triangulation between the lower end of the ladder, the lower end of the strut and the point of attachment of the strut to the ladder produces a stabilizing effect against further slippage and provides greatly enhanced safety.
REFERENCES:
patent: 767257 (1904-08-01), Banks
patent: 2652184 (1953-09-01), Loucks
patent: 2997127 (1961-08-01), Wojtowicz
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