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US 4,817,226 AGranted
Rotatively rubbing eraser
OwnerFu-Ching Kuoinventor
Life of this patent
Estimating the term…
Abstract
An eraser includes: a guiding holder having a pair of helical grooves formed inside the holder, and a sleeve holding an eraser stick in the sleeve having a pair of protruding beads formed on the sleeve helically engaging the pair of helical grooves in the holder, whereby upon a depression of the holder against a marking paper, the eraser as held in the sleeve is helically rotated to rotatively rub out a mark on the paper.
Claims4
A rotatively rubbing eraser comprising:
- a guiding holder generally formed as a cylindrical jacket having a cylindrical hole formed therein, a pair of helical grooves helically formed on a cylindrical wall defining the cylindrical hole of said holder, and a restoring spring having its upper end secured to a top-end plate sealing the cylindrical hole of said holder;
- an intermediate sleeve means generally formed as a cylindrical tube having a pair of protruding beads formed on two opposite sides of the cylindrical tube engageable with the pair of helical grooves in said holder;
- and an eraser positioning means secured with an eraser stick adjustably held in said sleeve means, said restoring spring normally tensioning said sleeve means outwardly within said guiding holder, whereby upon a holding and depression of said holder to allow said eraser to resiliently contact a mark on a paper to be erased, said sleeve means will be helically rotated within said holder to allow said eraser to rotatively rub out the mark.
Dependencies are inferred from the claim text.