| 摘要 |
<p>Retractable ladder comprising two steps provided with relevant connection means and driving means acting thereupon, suitable for positioning the ladder into a first configuration or positioning of use, in which the steps are accessible and, respectively, into a second configuration or rest positioning, in which the ladder is withdrawn, the ladder being characterized in that the means of connection between the first or upper step (2) and the second or lower step (3) comprise: a pair of arms (6) idly mounted onto a transverse actuator shaft (4), in correspondence of one respective end (61), and engaged, in correspondence of the other end, with said lower end (3) by a pivot (36), said arms (6) having a point (A) of abutment or limit stop upon the opening travel (30) for a second pivot (30) exhibited by the lower step (3); one or more tension rods (5) with one end engaged with the upper step (2) and with the other end engaged with the lower step (3); means associated with said shaft (4) and connected to the upper step (2) to cause the rotation thereof under control of the shaft (4). <IMAGE></p> |
