Mechanical pencil with automatic lead feed

Coating implements with material supply – Solid material for rubbing contact or support therefor – Including means to limit tool projection

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401 65, 401 67, 401 81, 401 94, B43K 2102

Patent

active

044525443

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.

REFERENCES:
patent: 267309 (1982-11-01), Hoffman
patent: 2469411 (1949-05-01), Robbins
patent: 2865330 (1958-12-01), Swank
patent: 3076437 (1963-02-01), Johnson
patent: 3864046 (1975-02-01), Butka
patent: 4180339 (1979-12-01), Katz
patent: 4275971 (1981-06-01), Katz

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