| 摘要 |
The field (10) has an access opening (11) provided with a cover (20) that is rotatably arranged in a plane of the opening and displaceable from a closing position into an open position. The cover partly closes the opening in the closing position. The cover is provided with rotatably mounted portions (21a) that are formed as sectors, segments, slats, roller blinds or flexible material webs. Sliding surfaces or slide bearings are provided on surfaces (22a) of the portions. The portions are resiliently mounted on a support plate (24) rotating in the plane of the opening. |
