| 摘要 |
Folding stairs have three segments of ladder stairs connected by hinges. The first segment of stairs is connected by an articulated joint with door frame by means of hinge holders fitted from inside to door frame wall, and during unfolding of these stairs rotation axle of the first segment of stairs does not change its position against door frame. Flap is suspended to the first segment of stairs by means at least two couples of connecting rods, which together with the first segment of stairs and the flap form four-bar linkage.
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