To raise or lower cordless blinds, simply pull down or lift up the bottom rail. This makes it possible to operate them through lifting and lowering. Overstockcom Online Shopping - Bedding Furniture Electronics Jewelry Clothing More Cordless Roller Shade Roller Shades Fabric Roller Shades Pulling down the blind enhances the spring’s tension, whereas pushing it up minimizes the stress. How do cordless roller blinds work . Like most cordless blinds, this design also comprises a flat pin and a ratchet whose function is to maintain the tension. Cordless blinds are an effortless way to control your home's light and privacy. How to operate a cordless roller blind. A cordless blind still has cords going through the slats in order to operate them. In these systems, there is a small button and all you will have to push or pull the button to raise or lower your blinds. To understand how cordless blinds work, think of an elevator, or a pulley system. How do cordless blind...