STEPLADDER Russian patent published in 2020 - IPC E06C1/14 

FIELD: construction.

SUBSTANCE: invention relates to construction, namely to designs of collapsible stairs, support posts of which have non-parallel legs. Stepladder comprises post with two αlegs arranged at an angle "α" to each other, connected to main leg by means of two hinges and fastening elements of both hinges located on one axis, wherein fasteners with hinges on each side of ladder stair of main post and hinged post are equipped in their upper part with four fastening hinges, to two of which are connected in the upper part additionally vertical side pillars-supports connected by means of hinges with fastening elements, and located sideways between main post and folding post with possibility of displacement by angle "α" relative to them in attachment points of four hinges on fastening element made in form of plate, note here that additional side props are made as extendable and have fixed thrust made up of screw with nut to provide required angle between them in working position.

EFFECT: high stability and broader functional capabilities of the ladder.

6 cl, 4 dwg