Structure of a ruler
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United States of America Patent
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Issued Date -
Apr 28, 2005
app pub date -
Oct 28, 2003
filing date -
Oct 28, 2003
priority date (Note) -
Abandoned
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Abstract
An improvement structure of a ruler, comprising: two rulers; an axis, composed of a hollow axis and a fixed axis, said hollow axis and said fixed axis being formed as one respectively to the ends of said rulers, said hollow axis being composed of an upper ring and an lower ring to combine said two rulers as one. Therefore, an improvement structure of the ruler of fewer elements, low cost and replacing rapidly can be obtained.
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