| 摘要 |
<p>The gate has a rectangular central panel (4) delimited by two horizontal and vertical bars (5a, 5b, 6a, 6b). A fixation unit fixes one of upright posts (2a, 2b) of the gate to an upright post (3) of a wall. A locking unit has four movable units (7) placed between bars (5a, 5b) and upright posts. Each unit allows a parallelogram deformation of the gate towards top, when the gate is passed from blocking to unblocking position.</p> |
