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  2. Door closer - Wikipedia

    en.wikipedia.org/wiki/Door_closer

    Modern manual door closer Eclipse door spring and separate checking mechanism. 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.

  3. Geared continuous hinge - Wikipedia

    en.wikipedia.org/wiki/Geared_continuous_hinge

    A geared continuous hinge is a type of continuous hinge used mostly on doors in high-traffic entrances and features gear teeth that mesh together under a cap that runs the length of the hinge. The hinges use a number of fasteners to attach the door to the frame from top to bottom to distribute a door’s weight more evenly along the frame to ...

  4. Hinge - Wikipedia

    en.wikipedia.org/wiki/Hinge

    An ornate brass door hinge A barrel hinge. A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation, with all other translations or rotations prevented; thus a hinge has one degree of freedom.

  5. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    Although there is no standard for the depth of equipment, nor specifying the outer width and depth of the rack enclosure itself (incorporating the structure, doors and panels that contain the mounting rails), there is a tendency for 4-post racks to be 600 mm (23.62 in) or 800 mm (31.50 in) wide, and for them to be 600 mm (23.62 in), 800 mm (31. ...

  6. Suicide door - Wikipedia

    en.wikipedia.org/wiki/Suicide_door

    A suicide door on a Delahaye Type 135 Lincoln Continental with rear suicide doors, left-side doors open. A suicide door is an automobile door hinged at its rear rather than the front. [1] Such doors were originally used on horse-drawn carriages [2] but are rarely found on modern vehicles, primarily because they are less safe than front-hinged ...

  7. Buckling spring - Wikipedia

    en.wikipedia.org/wiki/Buckling_spring

    The coil spring tensed between the keycap and a pivoting hammer buckles (i.e. kinks or collapses) at a certain point in its downward traverse, providing auditory and tactile feedback to the keyboard operator. Upon buckling, the hammer is pivoted forward by the spring and strikes an electrical contact which registers the key press.