Mechanical pencil

Details Mechanical pencil Mechanical pencil

1979-08-29

1981-11-10

Coven, Edward M.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401195, B43K 2108

Patent

active

042995060

ABSTRACT:
A mechanical pencil is disclosed which comprises a casing having a ferrule at its tip end and having an axially extending central bore formed therein, and a lead-containing sleeve fitted into the central bore and capable of containing a plurality of leads. The mechanical pencil includes a lead guide pipe which is mounted in the ferrule and extending into the central bore. A feed roller is rotatably mounted within the central bore between the lead guide pipe and the lead-containing sleeve for feeding a lead from the sleeve into the lead guide pipe. The feed roller has a frusto-conical configuration with its axis disposed at an angle with respect to the axis of the central bore, and is peripherally provided with a helical rib, which is adapted to engage the periphery of lead. A rotation is externally imparted to the shaft of the feed roller, thereby rotating it to feed a given length of the lead forward.

REFERENCES:
patent: 1664071 (1928-03-01), Furedy
patent: 2039466 (1936-05-01), Wahl
patent: 2184863 (1939-12-01), Most
patent: 2504420 (1950-04-01), Hull et al.
patent: 2511243 (1950-06-01), Brubaker
patent: 3997972 (1976-12-01), Jaunarajs
patent: 4037283 (1977-07-01), Moisiuk

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