STOP MECHANISM FOR COLLAPSIBLE LADDER Russian patent published in 2010 - IPC E06C1/12 

FIELD: construction.

SUBSTANCE: stop mechanism for collapsible ladder comprises several ladder sections, at the same time each ladder section has two ladder stands arranged parallel to each other and mutually joined at one end by crosspiece to form U-shaped ladder section, besides each ladder section is telescopically pulled into ladder section arranged below to form collapsible ladder, at the same time in lower end of ladder stands there are shock absorbers arranged, moreover, stop mechanism comprises stop mechanisms installed on each ladder stand, adjoining upper end of this ladder stand, and stop holes adjacent to lower end of this ladder stand, besides each stop mechanism comprises stop pin displaced by spring in direction of extended position to get engaged with stop hole available in ladder stand related to ladder section arranged above. Stop mechanism additionally comprises actuating elements to release stop mechanisms, at the same time these actuating elements are installed at least on one ladder section, besides each of shock absorbers of ladder sections is arranged with skewed surface, moreover, skewed surface of shock absorbers is designed for interaction with stop pins in ladder sections to pull stair section stop pin in, bringing it from extended and locking position to intermediate position, when ladder section arranged above is released and lowered, besides stop pins have skewed end, at the same time skewed surface of stop pins related to ladder section makes it possible for these stop pins to pull in further, thus changing from intermediate position to fully pulled-in or removed position from locking hole, releasing ladder section arranged below released one and ladder section arranged above, making it possible therefore to fold or lower all ladder sections arranged below released ladder section.

EFFECT: creation of stop mechanism for extensible telescopically folding ladders and steps, reduced labour expenditures to unlock stop mechanism and automatic folding of ladder.

16 cl, 18 dwg