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US 5,479,719 AGranted
Rolling ruler
OwnerBao-Shen Liuinventor
Life of this patent
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Abstract
The present rolling ruler includes a ruler body having a through hole, a shall having two ends and sleeving thereon the ruler body, and two rollers respectively mounted on the two ends for translating the ruler body. One characteristic of present invention is that different scales are provided on edges of a ruler body.
Claims16
A rolling ruler comprising:
- a ruler body integrally having a centrally located through hole;
- a plurality of surfaces on said ruler body defining an angular cross-section, the intersection of said surfaces forming a plurality of edges;
- a plurality of scales located on said edges;
- at least one scale of said scales being hidden from view when at least another scale of said scales is positioned for use;
- a shaft positioned in said centrally located through hole, said shaft having two ends;
- and
- two rollers respectively mounted on said two ends, said two rollers being sized to permit translation of said ruler body when each of said at least one scale and said at least another scale is positioned for use.
4 more elements
Dependencies are inferred from the claim text.