Lockable folding joint for foldaway ladder

Details Lockable folding joint for foldaway ladder Lockable folding joint for foldaway ladder

1990-09-07

1991-06-25

Kundrat, Andrew V.

Joints and connections

With indicator or inspection means

403 93, 182163, 16324, B25G 300

Patent

active

050261983

ABSTRACT:
In a lockable folding joint of a ladder having two arms with their flat heads pivoted to one another, a detent block used to engage one of spaced notches of one of the flat heads is held resiliently and firmly by an improved mechanism. The mechanism includes a one-piece curved rod spring which has two opposite arc-shaped rod portions whose one ends are attached to the detent block, two coiled portions formed at another ends of the arc-shaped rod portions and a U-shaped rod portion extending from the coiled portions. A spring plate has a rolled end pivoted to one of the arm with the same pivot pin as the coiled portions. The U-shaped portion depresses the spring plate so that the hook end of the spring plate is engaged tightly with the detent block.

REFERENCES:
patent: 3469277 (1969-09-01), Henrichs et al.
patent: 4645371 (1987-02-01), Wang

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