METHOD FOR MAKING VENETIAN BLINDS WITH DOUBLE CROSSBANDS AND LADDER BAND FOR USE IN SUCH BLINDS

摘要

To make Venetian blinds with double crossbands, the slats of the Venetian blind are inserted between a lower carrying crossband (C-D) and an upper crossband (A-B) preventing the slat from being lifted. The slats are inserted in ladder bands with two standard ladders each while their crossbands (A-B, C-D) are paired off at the same level. One standard ladder is then lowered until its crossbands (A-B) lock the underlying slat. The lowered ladder is fixed to the bottom strip of the Venetian blind while the ladder carrying the slats is fixed to the top strip of the Venetian blind. A ladder for this purpose includes two standard ladders whereby the crossbands (C-D) of the ladder fixed to the top strip of the Venetian blind constitute the lower carrying crossbands, while the crossbands (A-B) of the other ladder fixed to the lower strip of the Venetian blind constitute the upper crossbands preventing lifting. It is thus possible to insert the slats without a special embodiment of the instrument used and without reducing the insertion speed or safety.