Importance

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Abstract

A blind or shutter which is or can be assembled of prefabricated components and of yard goods cut to size at the locale of use has two hollow upright guide rails for the end portions of a curtain of interconnected upwardly and downwardly movable as well as tiltable slats, and combined lifting and tilting mechanisms for the slats. Such mechanisms have lifting bands which are disposed in the guide rails and are connected with the end portions of the slats to effect upward or downward movements of the slats in response to rotation of a main shaft in one or the other direction, and tilting bands which are disposed in the guide rails and change the angular positions of the slats in response to rotation of the main shaft. Blocking levers in the guide rails are connected with the ends of the lowermost slat by vertically movable carriages and engage the respective guide rails by gravity to hold the lowermost slat against unauthorized lifting when the lifting bands are slack. The blocking levers are disengaged from the respective guide rails in response to tensioning of the lifting bands. Levelling devices are provided on the end portions of the lowermost slat and on the carriages and hold the lowermost slat against angular movement when the lowermost slat is at least slightly above its lower end position. In the lower end position, all slats can be tilted between fully open and fully closed positions.

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First Claim