Mechanical pencil
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United States of America Patent
Stats
-
Dec 25, 2012
Grant Date -
Dec 23, 2010
app pub date -
Dec 18, 2008
filing date -
Mar 26, 2008
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A writing lead (10) is grasped and released by reciprocation of a chuck (3) provided in a body cylinder (1) so as to inch the writing lead forward and a rotational drive mechanism is provided for rotationally driving a rotor (5) in one direction in conjunction with retreat operation by the writing pressure applied to the writing lead and forward movement by releasing the writing pressure. A pipe support member (8) for supporting a pipe end (7) is accommodated in a base (1A) which constitutes a front end portion of the body cylinder, and a retreat drive mechanism is provided for gradually retreating the pipe support member into the body cylinder in conjunction with rotational drive operation of the rotor. With the above-mentioned structure, a pipe-slide type mechanical pencil can maintain an amount of projection of the writing lead from the pipe end within a certain range.
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Family
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Cited Art Landscape
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