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US 4,002,223 AGranted
Telescoping collapsible ladder
AssigneeFirearms Import and Export Corporation
InventorKeith David Bernkrant
Life of this patent
Estimating the term…
Abstract
A ladder is disclosed which includes telescoping sections that collapse and extend for adjusting the length of the ladder. The ladder is particularly useful on boats and may have curved upper ends on its side members for hooking the ladder over the side of a boat. The curved ends are rotatable for collapsing them toward the major plane of the ladder. Rotatable stand-off legs are also provided.
Claims7
In a ladder comprising parallel side members and a plurality of parallel steps traversing said side members and affixed thereto, said ladder having a major plane, the improvements wherein:
- said side members each include a tubular female section and a male section in concentric, telescoping relation with said female section and collapsible and extendable with respect thereto;
- said male and female sections each comprising plastic pipe with said male sections fitting slidably inside said female sections;
- said side members each further including additional male and female telescoping sections of plastic pipe alternating along the length of said ladder;
- said side members further including joints between said male and female sections;
- and
- sleeves at said joints arranged in pairs embracing said steps;
- said male sections having enlarged ends;
- and
- one of said sleeves in each pair forming a stop for one of said enlarged ends;
- whereby said side members of said ladder may be telescopically adjusted between collapsed and extended positions for adjusting the length of said ladder.
7 more elements
Dependencies are inferred from the claim text.