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2. Door closer - Wikipedia

   en.wikipedia.org/wiki/Door_closer

   Spring hinge uses a spring mounted in a hinge and is integral to its design. The spring can be either visible or hidden within a tube and can be found more commonly on interior doors. When used on doors that open both ways they are known as double action spring hinges. Self-closing hinges are an alternative to using a door closer.

3. 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.

4. 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 ...

5. Swing-door operator - Wikipedia

   en.wikipedia.org/wiki/Swing-door_operator

   The operator may or may not include a return spring to close the door in case of power failure while the door is open. Operators are often categorized by the means by which the motor's energy is applied. Electromechanical—the motor uses purely mechanical means to open the door: gears, cams, levers and such. This is the preferred type in the US.

6. 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!

7. Concrete hinge - Wikipedia

   en.wikipedia.org/wiki/Concrete_hinge

   Concrete hinges are hinges produced out of concrete, with little or no steel in the hinge neck, which allows a rotation without a significant bending moment. [1] The high rotations [ 2 ] [ 3 ] result from controlled tensile cracks as well as creep.