Fire escape – ladder – or scaffold – Pitched roof conforming scaffold
Patent
1998-11-03
2000-12-12
Johnson, Blair M.
Fire escape, ladder, or scaffold
Pitched roof conforming scaffold
182206, E04G 136
Patent
active
061585491
ABSTRACT:
A peak hook includes a pair of spaced-apart, elongated, hook-shaped members in which each of the hook-shaped members has a rear downwardly-depending leg for extending over a rear surface of a roof and a front downwardly-depending leg for extending over a front surface of the roof. A roof-engaging member having a length substantially equal to a width of the ladder attaches to the rear downwardly-depending legs for engaging the rear surface of the roof. A rung-engaging member attaches to the front downwardly-depending legs for supporting portions of a rung adjacent to opposite sides of the ladder. A slidable rung-engaging member having apertures through which respective front downwardly-depending legs extend cooperates with the rung-engaging member to releasably attach the peak hook to the ladder. Such a peak hook attaches to a relatively strong portion of the ladder, and a force or forces applied downwardly on one or more rungs of the ladder are counterbalanced by a force or forces on the roof which are spread out and aligned with the width of the ladder. This reduces, if not eliminates, a force or forces acting on the ladder which would otherwise tend to pivot the ladder relative to the peak hook and to the roof, and reduces the likelihood of damage to the roof.
REFERENCES:
patent: 1018877 (1912-02-01), Chickering
patent: 1252224 (1918-01-01), Bittner
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patent: 2426825 (1947-09-01), Geary
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patent: 4678061 (1987-07-01), Jordan et al.
patent: 5191954 (1993-03-01), Ledford
patent: 5279389 (1994-01-01), Crockett
patent: 5421428 (1995-06-01), Ingles
Cohen Curtis A.
Johnson Blair M.
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