Helical Door Spring
A helical spring —sometimes called a coil spring —is a wire wound into a helix (spiral) shape that stores mechanical energy. When installed in a door, particularly in spring-loaded hinges or overhead closers, these springs use torsion (twisting) or tension to gently return the door to its closed position Types Used in Doors: · Torsion (Helical Torsion) : Twists when the door opens and releases torque to close it. Common in hinge springs or pivot systems . · Extension (Tension) Helical : Stretchy and used in applications like spring‑loaded screen doors 2. Basic Construction & How It Works · Structure : Made from spring steel, stainless steel, or alloys—wire is tightly coiled with even pitch and diameter · Mechanics : o In torsion springs, as...