Mechanical pencil with self-tapping propelling nut and the metho

Details Mechanical pencil with self-tapping propelling nut and the metho Mechanical pencil with self-tapping propelling nut and the metho

1982-06-21

1985-03-19

Bratlie, Steven A.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 68, 401 75, 401 76, 401 79, 401 87, 401 72, B43K 2108, B43K 2400

Patent

active

045056064

ABSTRACT:
A screw feed mechanical pencil having a propelling nut which self-taps on an unthreaded interior barrel wall. The pencil's barrel and split tube are plastic extrusions and a square lead is used to prevent lead rotation during writing.

REFERENCES:
patent: 613453 (1898-01-01), Lippincott
patent: 1256367 (1918-02-01), Pfahler
patent: 1406362 (1922-02-01), Fowler
patent: 1450436 (1923-04-01), Fitton
patent: 1647059 (1927-10-01), Smith
patent: 1916199 (1933-07-01), Back
patent: 3176659 (1965-04-01), Sauber
patent: 3537799 (1970-11-01), Sakamoto
patent: 3767520 (1973-10-01), Dick et al.

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