| 摘要 |
Folding stairs have three sections of ladder-type stairs connected by hinges. The first section ( 11 ) of stairs is connected by a pivoting joint with the frame ( 2 ) by means of hinged holders ( 3 ) fitted from inside to the frame wall and during unfolding of these stairs the rotation axis of the first section (11) of stairs does not change its position with respect to the frame ( 2 ). The flap ( 4 ) is suspended from the first section ( 11 ) of stairs by means of at least two pairs of connecting members ( 41 , 42 ), which together with the first section of stairs and the flap form a four-bar linkage. Each connecting member on which the flap is suspended is connected with the flap by means of a hook-type holder ( 5 ) having the bearing seat for the pin seated in the connecting member ( 41 , 42 ). |
