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A universal joint (also called a universal coupling or U-joint) is a joint or coupling connecting rigid shafts whose axes are inclined to each other. It is commonly used in shafts that transmit rotary motion .
These machines position a cutting tool relative to a Cartesian coordinate system using three mutually perpendicular linear actuators (prismatic P joints), with (PP)P joint topology. The first industrial robot , [ 1 ] Unimate , was invented in the 1950s.
In 1904, Clarence W. Spicer, engineer, inventor, and founder of the company , began manufacturing universal joints in Plainfield, New Jersey. Also in 1904, the first C.W. Spicer "u-joints" were shipped to Corbin Motor Company in Connecticut. In 1905, Spicer Universal Joint Manufacturing Company was incorporated. [3]
Hardy Spicer is a brand of automotive transmission or driveline equipment best known for its mechanical constant velocity universal joint originally manufactured in Britain by Hardy employing patents belonging to US-based Spicer Manufacturing. Hardy and Spicer soon became partners. Later Spicer became Dana Holding Corporation.
[citation needed] Universal joints are capable of higher misalignments. Single joint gear couplings are also used to connect two nominally coaxial shafts. In this application the device is called a gear-type flexible, or flexible coupling. The single joint allows for minor misalignments such as installation errors and changes in shaft alignment ...
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