Back to results
US 4,869,026 AGranted
Sander
AssigneeLeonard L. Burrell
InventorLeo L. Burrell
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeLeonard L. Burrell
InventorLeo L. Burrell
Estimating the term…
A belt sander having a continuous belt whose grit faces inwardly toward the centrum of the space encompassed by the belt. The sander is powered by electric motor means such as an electric drill motor. Its function is to de-burr, sand, or polish metal or wood work pieces to a cylindrical or curved shape. Its action is to encompass the work piece with a moving belt whose inward facing surface is coated or covered by the desired abrasive or polishing material, and to cause contact between the belt and the work piece to remove or add material. Spring pressure is normally applied between the driving shaft or pulley and the frictionally driven belt to prevent or minimize slip when the driven belt sands a pipe or other curved surface. The sander is constructed so as to be selectively portable or stationary mounted on a table. It may also be driven by a chain saw.
A belt sander attachment comprising a substantially U-shaped portion including a pair of parallel arms, said arms having bearings through which a spindle extends for rotation by a portable electric drill motor, or the like, and including a spool between said arms encircling and driven by said spindle, an endless belt driven by said spindle and being of substantially greater length than the perimeter of said spool and having an inner abrasive surface, a pressure plate of substantially U-shape with outwardly flared terminal portions surrounding a portion of said spindle and belt, and spring means in a well portion of said body portion exerting spring pressure on said pressure plate which, in turn, exerts constant frictional pressure against the outer surface of said belt, whereby slipping of said belt on said spindle under substantial frictional loading between the belt and sanded work piece is practially eliminated.
A belt sander attachment for driving an endless belt having an abrasive inner surface for sanding outer curved surfaces, a portable motor for driving a spool which frictionally drives said inner surface of said belt, and adjustable spring pressure means including a substantially U-shaped pressure, springy plate having outwardly turned extremities and having an inner surface for applying constant friction to the outer surface of said belt while it is being driven, to minimize slip.
Dependencies are inferred from the claim text.