Screw-type writing instrument having expansion and contraction function
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United States of America Patent
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Jun 1, 2010
Grant Date -
Jun 5, 2008
app pub date -
Dec 16, 2005
filing date -
Jan 17, 2005
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention provides a screw-type writing instrument having an expansion and contraction function in which an outer shaft cam, a cartridge holder and an inner shaft cam are coupled in a double screw manner, so that the expansion or contraction of the writing instrument and the advancing or retracting operation of a pen core can be simultaneously conducted, thus being convenient to use, and which, thanks to the contractible structure, is convenient to carry and hold.
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Family
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Cited Art Landscape
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