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US 4,226,302 AGranted
Sectional ladder lock
AssigneeR. D. Werner Co., Inc.
InventorJohn N. Roche
Life of this patent
Estimating the term…
Abstract
There is disclosed herein a sectional ladder having at least a pair of ladder sections adapted to be slideably moved relative to the other for extension or retraction, one section carrying means adapted to engage a latch mounted on the other section for automatically locking the separate sections together in a selected locked position.
Claims16
Apparatus for releasably locking a ladder section to another ladder section, said ladder sections being movable relative to each other, and
- latch actuating means protruding from one of said ladder sections and being movable with said one ladder section;
- and
- a latching mechanism mounted on the other of said ladder sections, said latching mechanism including:
- a latching hook for securing said other ladder section to said one ladder section, said latching hook being movable between a locking position wherein a portion of said hook is disposed in the path of movement of said latch actuating means to releasably lock said ladder members together and a releasing position wherein said one ladder member is removable from said other ladder member;
- and
- tripping means operable in response to the movement of said latching hook to the locking position to prevent movement of said hook from the locking position, and manually operable for enabling the movement of said locking means from the locking position to the releasing position.
3 more elements
Dependencies are inferred from the claim text.