Mechanical pencil with automatic lead feed
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United States of America Patent
Stats
-
Jun 5, 1984
Grant Date -
N/A
app pub date -
Apr 26, 1982
filing date -
Apr 28, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A mechanical pencil with automatic lead feed has a clamping mechanism for clamping a lead in such a manner that it holds the lead steadily against rearward movement but easily permits the lead to move forwardly. A lead tube is fixed at its rear end to the front end of a housing to guide and protect the lead. A sensor is slidably held in the front end of the housing and extends along the lead tube to sense the wear of the lead during writing. A lead advancing mechanism is actuated by the sensor and has a holder for frictionally holding the lead and an elastic member for urging the holder forwardly.
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