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[Bearing In English]Hinge

A hinge is a type of 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. Hinges may be made of flexible material or of moving components. In biology, many joints function as hinges.

Building access hinges

Since at least medieval times there have been hinges to draw bridges for defensive purposes for fortified buildings. Hinges are used in contemporary architecture where building settlement can be expected over the life of the building. For example, the Dakin Building, California was designed with its entrance ramp on a large hinge to allow settlement of the building built on piles over bay mud. This device has been effective.
Large structure hinges

Hinges appear in large structures such as elevated freeway ad railroad viaducts. These are included to reduce or eliminate the transfer of bending stresses between structural components, typically in an effort to reduce sensitivity to earthquakes. The primary reason for using a hinge, rather than a simpler device such as a slide, is to prevent the separation of adjacent components. When no bending stresses are transmitted across the hinge it is called a zero moment hinge.Other hinges

Butler tray hinge
Fold to 90 degrees ad also snap flat. They are for tables that have a tray top for serving. Drop leaf table hinge
Mounted under the surface of a table with leaves that drop down. They are most commonly used with rule joints. Piano hinge
a long hinge, originally used for piano lids, but now used in many other applications where a long hinge is needed.

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