Folding step ladder

Folding step ladder with integrated safety handle and interlocking tread mechanism

This technology is a folding ladder that forms a staircase when opened and folds flat for storage. It features treads with increasing surface areas toward the bottom, rotatably coupled between a pair of support frames, and a folding linkage system that allows all treads to open or close simultaneously.

Standard ladders, which require climbing on thin rungs, are prone to accidents and are difficult for children or the elderly to use safely. Existing convertible ladders that transform into slides are often unstable when set up vertically in tight spaces, as the steps are arranged in a way that lacks proper support.

This technology uses horizontal frames and sliding support rods to firmly bear vertical loads. When the treads open, a safety bar extends toward the user via rail grooves and rollers, then retracts into the frame when folded. Ideal for attics, warehouses, and RVs, it allows safe, stair-like access.

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Key Features:

• Multiple treads coupled between a pair of spaced-apart support frames, designed to rotate and fold, with surface areas that increase toward the bottom to form a staircase when opened
• A folding linkage system consisting of rotating bodies coupled to tread axes and connecting members that transmit rotational force between adjacent bodies
• Horizontal frames supporting the underside of the treads, plate-receiving grooves for folded treads, and support rods rotatably coupled to the frame that slide along the treads
• A rod-type safety bar that extends toward the user when the tread rollers slide along rail grooves during opening, and retracts into the support frame when folded

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