Mechanical pencil with shaking type lead-feeding mechanism
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United States of America Patent
Stats
-
Oct 11, 1994
Grant Date -
N/A
app pub date -
Nov 3, 1992
filing date -
Mar 4, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A longitudinal opening window (1B) is formed a: a rear end portion of a cylindrical casing (1) of a mechanical pencil. At the rear end of the cylindrical casing (1), an eraser holder (12) is disposed in such a way that it can move forward and rearward for a predetermined distance. At the rear end of the eraser holder (12), a rubber eraser (13) is mounted. At the front of the eraser holder (12), a cylindrical small diameter front portion (12B) is provided. On the outside of the small diameter front portion (12B) is disposed a stop portion (12D) protruding outwardly on a resilient piece (12C). The stop portion (12D) engages with the opening window (1B). The rear end of a lead reservoir (10) connected to the rear portion of a chuck (7) extends to the inside of the small diameter front portion (12B). When the cylindrical casing (1) is shaken, a weight (11) surrounding the lead reservoir (10) moves forward, thereby causing the chuck (7) to move forward. When the weight is moved rearward due to the reaction, it collides with the front end of the small diameter front portion (12B), thereby causing the eraser holder (12) to move rearward. Thus, the shock of the rearward movement of the weight (11) is not applied to other than the eraser holder (12).
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