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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

    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.

  4. Talk:Garage door/Archive 1 - Wikipedia

    en.wikipedia.org/wiki/Talk:Garage_door/Archive_1

    1 Garage Door Spring. 1 comment. 2 Additional Information on springs and doors. 2 comments. 3 Garage Entry Door. Toggle the table of contents. Talk: Garage door ...

  5. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    A door closer is a mechanical device that regulates the speed and action of a door’s swing. [1] Manual closers store the force used to open the door in some type of spring and reuse it to close the door. Automatic types use electricity to regulate door swing behavior. Door closers can be linked to a building's fire and security alarm systems. [2]

  6. Jervis B. Webb Company - Wikipedia

    en.wikipedia.org/wiki/Jervis_B._Webb_Company

    Jervis W. Webb's old headquarters building, Farmington Hills. Jervis B. Webb Company is a global company that designs, engineers, installs and supports integrated material handling systems such as baggage handling systems, Automatic Guided Vehicles (AGVs), conveyor systems and Automated Storage and Retrieval Systems (AS/RS).

  7. 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.

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