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US 4,536,994 AGranted
Curved surface sanding device
OwnerWilliam T. Krebsinventor
Life of this patent
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Abstract
A device comprising a slotted cylindrical tube mounted on a mandrel is used to sand curved and irregular surfaces. This is achieved by wrapping an abrasive paper strip around the tube. The strip is locked in place by making a fold in the abrasive strip and inserting both of its ends through the slot, around the mandrel, and back through the slot again. The mandrel is designed to fit within a drill chuck.
Claims2
A method of sanding curved surfaces using a self-locking sanding device, said method comprising the steps of:
- making a fold in a strip of abrasive paper;
- inserting said fold around a mandrel and through a longitudinal slot of a tube coaxial to and surrounding said mandrel such that the abrasive paper strip on both sides of said fold extends through said slot to the outside of said tube;
- wrapping said abrasive paper strip around said tube such that both sides of the fold extend at least partially around said tube;
- inserting an end of said mandrel into a drill chuck;
- and
- operating said self-locking sanding device to sand an object,
- whereby said abrasive paper strip is positively locked in place by the forces acting thereon during said operation.
4 more elements
Dependencies are inferred from the claim text.