Mechanical pencil with tapered supply chamber

Details Mechanical pencil with tapered supply chamber Mechanical pencil with tapered supply chamber

1987-10-07

1991-07-23

Bratlie, Steven A.

Coating implements with material supply

Solid material for rubbing contact or support therefor

Including means to advance material

401 85, 401 94, B43K 2100, B43K 2104

Patent

active

050338943

ABSTRACT:
A knock-out type mechanical pencil which comprises a lead containing tube in which the inner and outer walls thereof are so tapered that the lead inlet thereof is larger in diameter than the opposite end thereof. The mechanical pencil further comprises a spring supporting ring interposed between the clamping ring so attached to the outer periphery of a chuck portion integrally formed with the lead guide of the lead containing tube and spiral springs to oppose with the base end of the ferrule within the outer barrel for urging the spring supporting ring to the ferrule. Thus, this mechanical pencil can eliminate the lead jams in the lead containing tube and lead breakage therein.

REFERENCES:
patent: 1262859 (1918-04-01), Smith
patent: 1621990 (1927-03-01), Lippert et al.
patent: 1636207 (1927-07-01), Bartholomew
patent: 1693579 (1928-11-01), Straka
patent: 2436437 (1948-02-01), Koch
patent: 4358210 (1982-11-01), Hashimoto et al.
patent: 4371277 (1983-02-01), Kageyama et al.
patent: 4627756 (1986-12-01), Kageyama

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