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2. Garage door - Wikipedia

   en.wikipedia.org/wiki/Garage_door

   Sectional garage door Up-and-over garage door Garage Door Hardware. A garage door is a large door to allow egress for a garage that opens either manually or by an electric motor (a garage door opener). Garage doors are frequently large enough to accommodate automobiles and other vehicles. The operating mechanism is usually spring-loaded or ...

3. Garage door opener - Wikipedia

   en.wikipedia.org/wiki/Garage_door_opener

   The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.

4. Torsion spring - Wikipedia

   en.wikipedia.org/wiki/Torsion_spring

   Garage Door Sectional Torsion Spring A mousetrap powered by a helical torsion spring Video of a model torsion pendulum oscillating. A torsion spring is a spring that works by twisting its end along its axis; that is, a flexible elastic object that stores mechanical energy when it is twisted.

5. Elevator - Wikipedia

   en.wikipedia.org/wiki/Elevator

   However, the door close button will cause a hall call to be ignored (so the door will not reopen), and once the timeout has expired, the door close will immediately close the door, for example, to cancel a door open push. The minimum timeout for automatic door closing in the US is 5 seconds, [63] which is a noticeable delay if not over-ridden.

6. Trolleybus - Wikipedia

   en.wikipedia.org/wiki/Trolleybus

   Busscar trolleybus in São Paulo, Brazil Solaris trolleybus in Landskrona, Sweden Video of a trolleybus in Ghent, Belgium. A trolleybus (also known as trolley bus, trolley coach, trackless trolley, trackless tram – in the 1910s and 1920s [1] – or trolley [2] [3]) is an electric bus that draws power from dual overhead wires (generally suspended from roadside posts) using spring-loaded ...

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   www.aol.com/games

   Discover the best free online games at AOL.com - Play board, card, casino, puzzle and many more online games while chatting with others in real-time.