| 摘要 |
<p>The device (1) has a chassis (2) with hallow posts (4a, 4b) and partially closed by a grillage (7) arranged between the posts. A movable element (3) is slidingly mounted above the chassis, and has posts (15a, 15b) sliding with the posts (4a, 4b). The element is closed by another grillage (18) arranged between the posts (15a, 15b). An adjusting unit is formed of a threaded rod (25) and a wing nut (26), and adjusts positioning of the element above the chassis so as to slide the element above the chassis during installation of the device until that the chassis and the element close an opening.</p> |
