Lock mechanism for extension ladder

Details Lock mechanism for extension ladder Lock mechanism for extension ladder

1983-06-27

1984-08-28

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

Ladder

Extension

E06C 706

Patent

active

044678916

ABSTRACT:
There is disclosed a releasable lock mechanism for an extension ladder comprising a bell crank lever attachable to a fly rail of the ladder through a first pivot, and having first and second joined arm segments extending generally forward and downward, respectively, from their juncture. The first arm segment has at its front a head movable by pivoting of the lever between first and second positions at which the head will and will not, respectively, engage base rungs of the ladder. A tongue with a tip is attached to a lower part of the lever's second arm segment through a second pivot. Attachable to the rail is a frame operable during downsliding of the ladder's fly section to guide translatory movement of the tongue so that strikings of its tip by base rungs of the ladder are effective to pivot the lever to permit its head to pass by such rungs. When the lever head engages the top of a base rung to lock the fly section from downsliding, the tongue is held against flapping about the second pivot.

REFERENCES:
patent: 457805 (1891-08-01), Whittington
patent: 523848 (1894-07-01), Bushnell
patent: 679385 (1901-07-01), Klemme et al.
patent: 4299306 (1981-11-01), Hawkins

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