| 摘要 |
Accommodated in a lintel recess (7) are two winding rollers (1, 1a) which run parallel to one another but are arranged at a spacing one above the other. Each winding roller (1, 1a) is provided with a separate armour (2, 3) which can be rolled up and down. A single articulated crank rod (4) is provided for the two winding rollers (1, 1a), which is limitedly displaceable in the direction of its longitudinal axis. The crank rod (4) has a cross-sectionally circular section (4a) which lies at the free end of the same and a cross-sectionally square section (4b). By displacing the crank rod (4), the cross-sectionally square section (4b) is drawn into or out of a corresponding square hole of a worm (6) of a gear (5) of one winding roller (1). In this manner, one of the winding rollers (1, 1a) is always actuated, optionally, with a single crank rod. <IMAGE>
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