Mechanical pencil with automatic lead feed

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

1978-06-28

1979-12-25

Coven, Edward M.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 65, B43K 2102

Patent

active

041803396

ABSTRACT:
A mechanical pencil with a lead feed, automatically produced by pressure during use of the pencil, comprises a tubular lead magazine closed at an outer end by a removable actuating button and being movably guided in a tubular housing, clamping elements in the housing actuatable by pressure on the actuating button and a lead guide tube projecting from a conical end of the housing and being movable against the pressure of a spring into the latter and carrying at the inner end thereof an entrainment element exerting friction on the lead passing therethrough, in which the clamping elements are movable by means of the actuating button against the force of a second weaker spring and guided by rolling elements along a conical guide face of a clamping cone, which in turn is axially movable between two end positions in the housing.

REFERENCES:
patent: 2452905 (1948-11-01), Collura
patent: 2911948 (1959-11-01), Spector
patent: 3408147 (1968-10-01), Bleuer
patent: 3424535 (1969-01-01), Schischkow
patent: 3437413 (1969-04-01), Parker
patent: 3765781 (1973-10-01), Hashimoto et al.
patent: 3864046 (1975-02-01), Butka
patent: 3880530 (1975-04-01), Katz
patent: 3945733 (1976-03-01), Edel
patent: 3947133 (1976-03-01), Kogeyama

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