| 摘要 |
The ring (3) is fixed and arranged to hold together the screen (2) at a predetermined distance from its one free ends (10). The screen holder (4) has a lock device (5), around which the screen can be turned for its fixation on its holder. The screen locates against a support component (7) on the holder, the position of which in retention to the lock device determines the screen conicity. The ring has a circular formation and runs through a hole (9) extending through the cohesive lamellae (8) forming the pleated screen. |
