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  2. 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.

  3. File:Door Swing Diagram.svg - Wikipedia

    en.wikipedia.org/wiki/File:Door_Swing_Diagram.svg

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Pages for logged out editors learn more

  4. 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 ...

  5. Swing-door operator - Wikipedia

    en.wikipedia.org/wiki/Swing-door_operator

    When opening the door manually, the opener portion is still, so the opening is smooth and quiet. Permanently engaged—the motor driven mechanism (the opener portion) is always joined to the closer (if present) and to the door. When opening the door manually, the user is also driving the opener portion, so the opening is rough and noisy.

  6. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    Older manual door closer (made by BKS) Friction-based mechanical speed control mechanism. A spring, hydraulic pressure, or a combination of both, is found in manual door closers. The energy used in opening the door is stored in a spring (compression, torsion, tension, volute or leaf), [25] and released to close the door. Spring tension is ...

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