Cardan hinge

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Universal joint — A universal joint, U joint, Cardan joint, Hardy Spicer joint, or Hooke s joint is a joint in a rigid rod that allows the rod to bend in any direction, and is commonly used in shafts that transmit rotary motion. It consists of a pair of ordinary… … Wikipedia
Flexure bearing — A flexure bearing is a bearing which allows motion by bending a load element.A typical flexure bearing is just one part, joining two other parts. For example, a hinge may be made by attaching a long strip of a flexible element to a door and to… … Wikipedia

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