Stainless Steel Access Doors

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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: all other translations or rotations being prevented, and thus a hinge has one degree of freedom. Hinges may be made of flexible material or of moving components. In biology, many joints function as hinges like the elbow joint.


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Door types

There are many types of door hinges. The main types include:

Other types include:

  • Counterflap hinge
  • Flush hinge
  • Coach hinge
  • Rising Butt hinge
  • Double action spring hinge
  • Double action non-spring
  • Tee hinge
  • Friction hinge
  • Security hinge
  • Cranked hinge or stormproof hinge
  • Lift-off hinge
  • Self closing hinge

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Building access

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 in Brisbane, 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 was effective until October 2006, when it was replaced due to damage and excessive ramp slope.


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Large structures

Hinges appear in large structures such as elevated freeway and 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.


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Spacecraft

People have developed a variety of self-actuating, self-locking hinge designs for spacecraft deployable structures such as solar array panels, synthetic aperture radar antennas, booms, radiators, etc.


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Hinge terminology

Components

Characteristics


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Other types

Source of the article : Wikipedia



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