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2. Garage door - Wikipedia

   en.wikipedia.org/wiki/Garage_door

   The weight of the door may be 400 lb (180 kg) or more but is balanced by either a torsion spring system or a pair of extension springs. [2] A garage door opener is controlled motorized mechanism for opening garage doors adds convenience, safety, and security often used with a remote or a button on wall. [3]

3. Spring (device) - Wikipedia

   en.wikipedia.org/wiki/Spring_(device)

   A flat spring fixed only at one end like a cantilever, while the free-hanging end takes the load. Coil spring Also known as a helical spring. A spring (made by winding a wire around a cylinder) is of two types: Tension or extension springs are designed to become longer under load. Their turns (loops) are normally touching in the unloaded ...

4. AOL

   search.aol.com

   The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web.

5. Coil spring - Wikipedia

   en.wikipedia.org/wiki/Coil_spring

   Types of coil spring are: Tension/extension coil springs, designed to resist stretching. They usually have a hook or eye form at each end for attachment. Compression coil springs, designed to resist being compressed. A typical use for compression coil springs is in car suspension systems. Volute springs are used as heavy load compression ...

6. Garter spring - Wikipedia

   en.wikipedia.org/wiki/Garter_spring

   A garter spring inside a rubber seal. A garter spring is a coiled steel spring that is connected at each end to create a circular shape, and is used in oil seals, shaft seals, belt-driven motors, and electrical connectors. Compression garter springs exert outward radial forces, while extension garter springs exert inward radial forces.

7. Expansion spring - Wikipedia

   en.wikipedia.org/wiki/Expansion_spring

   Expansion springs are used as electrical connectors in some children's electronics kits. They are easy to use with bare fingers , they accept multiple wires, they require no learning or expertise to use them, and the cost is low.