Mechanical pencil with automatic lead feed

Details Mechanical pencil with automatic lead feed Mechanical pencil with automatic lead feed

1982-04-26

1984-06-05

Bratlie, Steven A.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to limit tool projection

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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