System for operating top down/bottom up covering for architectural openings
View Patent ↗A control system for a top down/bottom up covering for an architectural opening includes a common drive shaft for raising and lowering a middle rail and a bottom rail between which a flexible shade material extends. A control element operates a spool lift system and a roller lift system, with the spool lift system being associated with the middle rail and the roller lift system being associated with the bottom rail. The lift systems are sequentially operated when the drive shaft is driven in either direction by the control element.
1. A shade material for coverings for architectural openings comprising in combination:
a first sheet of shade material having a length and a width,
a second sheet of material having a greater length than said first sheet of material and substantially the same width as said first sheet of material,
a plurality of parallel continuous lines of hot-melt adhesive extending across the width of one of said first and second sheets of material,
said first and second sheets being adhesively secured together at intervals along said continuous lines of adhesive which are activated in said intervals but not in gaps existing between said intervals such that loops of material are formed in said second sheet between said lines of adhesive and said gaps exist along said lines of adhesive between said intervals where the sheets are not secured.
2. The shade material of claim 1 wherein said adhesive is non-tacky until heated above a predetermined temperature.
3. The shade material of claim 2 wherein said sheets of material are secured together by heating said lines of adhesive above said predetermined temperature in said intervals and engaging said materials along said lines of adhesive.
4. The shade material of claim 3 wherein said lines of adhesive are ultrasonically heated by placing said sheets with the lines of adhesive on one of said sheets on an anvil and advancing an ultrasonic horn against the sheets of material in a manner to heat said lines of adhesive only along said intervals.
5. The shade material of claim 4 wherein said horn has a substantially flat face for engagement with said sheets and wherein said anvil includes channels which are aligned with said gaps so that said lines of adhesive are not heated above said predetermined temperature where said lines of adhesive are aligned with said channels.