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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. Torsion spring - Wikipedia

   en.wikipedia.org/wiki/Torsion_spring

   The force of the spring reverses the direction of rotation, so the wheel oscillates back and forth, driven at the top by the clock's gears. Torsion springs consisting of twisted ropes or sinew, were used to store potential energy to power several types of ancient weapons; including the Greek ballista and the Roman scorpio and catapults like the ...

4. 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.

5. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

6. 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 ...

7. 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 ...