Tubular slat for coverings for architectural openings
View Patent ↗A slat or vane for use in a covering for an architectural opening is suitable for use in either a horizontal or vertical orientation and in a horizontal orientation will not sag or droop, and in a vertical orientation will rotate uniformly along its length when rotated from end thereof. The slat is formed in a tubular configuration and has a base material of glass fibers bonded together in a thermoformable resin so as to maintain the arcuate curvature desired for the tubular slat or vane. The slat can be repeatedly deformed and will always return to its original configuration.
1. A method of forming an elongated flat strip of material into an elongated strip having an arcuate transverse configuration, manipulating the strip into a roll such that the arcuate transverse configuration is flattened and subsequently unrolling the flattened strip so it reassumes an arcuate transverse configuration, comprising the steps of: providing an elongated starter strip of fiberglass in a thermosetting resin that has not been cross-linked by being heated; providing a first stationary mandrel having an arcuate surface and a system for heating said first stationary mandrel; providing a second stationary mandrel having an arcuate surface and a system for cooling said second stationary mandrel; passing said starter strip along its length across said first stationary mandrel to heat said thermosetting resin above its setting temperature to form a heated strip having said transverse arcuate shape; passing said heated strip along its length across said second stationary mandrel to cool said thermosetting resin beneath its setting temperature to form a cooled strip having said transverse arcuate shape; rolling up said cooled strip, whereby it will become deformed into a flattened transverse configuration and unrolling said deformed flattened strip allowing it to re-assume said arcuate transverse cross-section.
2. The method of claim 1 , further including the steps of providing an elongated strip of fabric adjacent to said elongated starter strip, applying adhesive to one of said strips, and bonding said strips together into a laminate before passing said starter strip across said stationary mandrels.
3. The method of claim 1 or 2 wherein said arcuate surfaces of said stationary mandrels are convex.
4. The method of claim 3 further including the steps of providing mandrel components having a concave arcuate surface to complement said convex arcuate surfaces of said stationary mandrels and placing said mandrel components in confronting relationship with said stationary mandrels such that an arcuate space is defined therebetween through which said starter strip can be passed.
5. The method of claim 1 or 2 wherein said starter strip is provided in roll form.
6. The method of claim 2 wherein said starter strips and said strip of fabric are provided in roll form.
7. The method of claim 1 wherein said starter strip contains 21 to 24% by dry weight of a thermosetting resin.