| 摘要 |
The stairs include a case (1) with a pedal to deploy it (2) and treads. The case slides on two rails (3) which are toothed and when the case arrives at the end of the rails a catch releases the mechanism of the post (5) which raises the treads (6) and the banisters (7). The weight of the user on the lower tread automatically retracts the rollers (8) to allow the fixed feet (9) to engage the ground. Removal of the weight of the user allows retraction of the treads. |
