Writing instrument including stick-shaped material propelling mechanism
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United States of America Patent
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Oct 23, 2007
Grant Date -
Dec 28, 2006
app pub date -
Jun 24, 2005
filing date -
Jun 24, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A writing instrument including a stick-shaped material propelling mechanism which is capable of propelling a stick-shaped material without relatively rotating the stick-shaped material with a small number of components is provided.The writing instrument includes an outer barrel, a lead feeding mechanism disposed in the outer barrel, and a stick-shaped material propelling mechanism connected to a rear portion of the lead feeding mechanism, a female thread is formed on an inner peripheral surface of a rear portion of a lead tank of the lead feeding mechanism. The stick-shaped material propelling mechanism includes a knock cap connected to the lead feeding mechanism to be relatively rotatable, and a stick-shaped material bearer which is slidable and unrotatable relative to the knock cap and for holding a stick-shaped material, and a male thread which is screwed into the female thread of the lead tank is integrally formed at the stick-shaped bearer.
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