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US 4,080,683 AGranted
Chalk board eraser
OwnerChong Sun Yiinventor
Life of this patent
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Abstract
A self-cleaning hand-held chalk board eraser is disclosed which includes a chalk trough for catching and collecting the loose chalk from a chalkboard, a roller, the outer surface of which is made of suitable chalk-erasing material, and a brush mounted in the eraser to remove the loose chalk from the roller material in such a way that the loose chalk becomes trapped in the chalk trough.
Claims9
A hand-held self cleaning chalkboard eraser comprising, in combination:
- a case;
- a roller rotatably mounted in the case and including an outer surface made of a chalk erasing material for removing chalk from the chalkboard;
- a stationary means mounted in the case for engaging the erasing material of the roller whereby loose chalk is removed from the erasing material as the roller rotates with respect to the case;
- and wherein said means does not absorb chalk at the engaging surface;
- at least one chalk trough for storage of loose chalk removed from the chalkboard situated to receive the loose chalk as it is removed from the erasing material;
- and
- step-down gearing means connected to said roller for slowing the rotation of the roller as it is moved along the surface of a chalkboard so that there is sliding between the roller and the chalkboard when the eraser is moved across the chalkboard in a direction transverse to the roller axis.
4 more elements
Dependencies are inferred from the claim text.