Locking device for bidirectionally foldable step ladders

Details Locking device for bidirectionally foldable step ladders Locking device for bidirectionally foldable step ladders

1992-05-08

1992-12-15

Johnson, Blair M.

Fire escape, ladder, or scaffold

Unitary foldable, rigid scaffold or ladder

Collapsible ladder

182156, E06C 100

Patent

active

051708620

ABSTRACT:
A locking device for preventing bidirectionally foldable step ladders from folding when in an unfolded position, the step ladders being the type including two pairs of U-shaped side rails and a plurality of foldable steps linked by braces to a plate slidably received within respective side rails. The locking device is pivotally attached within a side rail and co-operates with a bracket fixed to the plate to prevent the plate from moving upward when the step ladder is unfolded.

REFERENCES:
patent: 958732 (1910-05-01), Dennis
patent: 1054108 (1913-02-01), Garraway
patent: 1371125 (1921-03-01), Speckman, Jr.
patent: 3084760 (1963-04-01), Lamberti
patent: 4560030 (1985-12-01), Mucelli
patent: 4842099 (1989-06-01), Collet et al.

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