Automatic mechanical pencil and method of assembly thereof
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 3, 2007
Grant Date -
Feb 1, 2007
app pub date -
Jun 29, 2006
filing date -
Jul 20, 2005
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An automatic mechanical pencil has a tubular piece removably connected to a barrel cylinder, and a slider for frictionally holding a lead and being movably disposed in a front portion of the tubular piece. A lead chuck is disposed in the barrel cylinder for releasably holding the lead so as to allow forward movement of the lead but prevent backward movement thereof. A first spring urges the slider forward and the lead chuck backward so that when a writing front end of the writing instrument is released from a writing surface, the lead is automatically fed by urging the slider forward. A lead reservoir is disposed rearwardly of the lead chuck to supply the lead to the lead chuck. The lead reservoir has a reservoir main body, a pipe holder connected to a front end of the reservoir main body and having a guide projection, and a stopper disposed around an outer periphery of the pipe holder and having a receiving groove engageable with the guide projection. A second spring urges the reservoir main body and the stopper of the lead reservoir so that the reservoir main body and the stopper move relatively in the axial direction of the barrel cylinder.
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