| 摘要 |
The invention relates to a foldable stairs, and in particular to a metal foldable ladder- like stairs, comprising stairs segments (2, 3, 4) moveable with relation to each other, wherein the uppermost segment (2) is rotationally connected with a frame (1 ) mounted in a ceiling and preferably the uppermost stairs segment (2) is attached to the cover (11 ) that adheres to said frame (1 ) in the stairs closed state and is connected with the frame (1 ) by means of a hinge mechanism and the stairs segments (2, 3, 4) are positioned within the frame (1 ) in the stairs closed state, where the stairs are preferably provided with a mechanism, preferably a spring mechanism, that supports lifting folded stairs up to the stairs closed state and at least partially counterbalances the weight of the stairs during opening thereof, and further the stairs are provided with at least one handrail arranged in the top part of the stairs flight. In order to facilitate folding and unfolding the stairs and to provide the stairs featuring adjustable length, the stairs comprise a spring (6) that supports lifting up of the stairs segments (3, 4, 7) other than the uppermost segment (2) during folding these segments (3, 4, 7) with the uppermost segment (2) and at least partially counterbalances the weight of these segments (3, 4, 7) during unfolding the stairs, wherein the spring (6) is arranged inside the handrail (5). The bottom segment (4) of the stairs is advantageously provided with means (41, 42) for regulating the length of the bottom segment (4). |
