TODAY’S PATENT- ROTARY SCRAPER

In today’s patent, we will discuss David E. Thompson (Norwalk, CT)’s invention, “ROTARY SCRAPER” (US3958294A), which was patented by the USPTO on May 25, 1976.

The following invention generally deals with a rotary scraper with fingers striking the work surface at a lagging angle, thereby removing material by impact rather than by a scraping action. The major objective behind this invention is  to remove surface layers without tending to remove material from the base. Such machines does not fully take advantage of the physical characteristic differences between the material to be removed and an underlying substance. Rather these machines rely either on an inferior shear bond between the two materials, or upon careful and continual visual inspection of extant material. Wire brushes and the strands that extend radially due to centrifugal force, and will gouge the work surface if care is not exercised. Because the strand strikes the surface at nearly a right angle, a shearing force is applied to the surface, removing the material at the tip of the strand irrespective of whether such removal is desired or not.