| 摘要 |
<p>A flexible net, held so that it can be rolled up on a roller with a fitted torsion spring, provides protection from insects on windows and doors. A housing unit serving as abutment for the spring is mounted coaxially with the roller (6). The roller has an elongated slot in the area where it fits against the window or door frame, with the net (7) passing in and out through it. An area of the housing (8) below the slot is offset inwards relative to the surface containing the slot, to the extent of the net thickness. Construction is simplified in respect of all-round sealing of peripheral areas.</p> |
