A paint roller is a paint application tool used for painting large flat surfaces rapidly and efficiently.
The paint roller  typically consists of two parts: a "roller frame," and a "roller cover." The roller cover absorbs the paint and transfers it to the painted surface, the roller frame attaches to the roller cover. A painter holds the roller by the handle section. The roller frame is reusable. It is possible to clean and reuse a roller cover, but it is also typically disposed of after use.
The roller cover is a cylindrical core with a pile fabric covering secured to the cylindrical core. Foam rubber rollers are also produced. There are both foam and fabric rollers that are individually available (without a handle), made to replace worn out rollers, once an old roller is removed the new roller can be fitted onto the handle section for use. An innovation of the cylindrical core has allowed it to contain paint inside, with the cover absorbing paint from the inside and filtering it through (naturally by wicking) to be applied externally, when the roller is rolled.
The basic device was invented in 1940 by the Canadian Norman Breakey (born 1891- died aft. 1940). Breakey was never able to produce his invention in large enough numbers to profit from it before others made small changes to the paint roller's design and were able to market it as their own invention. One of the others was Richard Croxton Adams who held the first U.S. patent on the paint roller. He claimed to have developed it in his basement workshop in 1940 while working for the Sherwin-Williams Paint Company.
The well known science fiction writer E.E. "Doc" Smith, author of "Skylarks of Space", in his book "Spacehounds of IPC", which was published in a magazine serial in 1931, actually mentioned using rollers to spread a paste on the outside of a space ship.
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