Projection-retraction mechanism for a writing instrument

Details Projection-retraction mechanism for a writing instrument Projection-retraction mechanism for a writing instrument

1983-09-06

1985-07-16

Bratlie, Steven A.

Coating implements with material supply

Projectable and retractable tool

Manually reciprocable sleeve

401 91, 401116, B43K 2300, B43K 712

Patent

active

045293287

ABSTRACT:
A two-part barrel sleeve includes an internal spring finger which rides in a spiral groove in the combined ink reservoir and barrel of a ball pen, the spiral groove having a detent at its rear end to provide a snap-action as the barrel sleeve is retracted to its rearmost position exposing the writing tip for normal use.

REFERENCES:
patent: 866148 (1907-09-01), Levingston
patent: 928312 (1909-07-01), Lloyd
patent: 1493833 (1924-05-01), Wade
patent: 2441280 (1948-05-01), Moore
patent: 2603186 (1952-07-01), Fischer
patent: 2941511 (1960-06-01), Cieremans

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