Retractable capless marking pen

Details Retractable capless marking pen Retractable capless marking pen

1984-02-24

1985-09-10

Bratlie, Steven A.

Coating implements with material supply

Projectable and retractable tool

With movable closure or gate

401108, B43K 900

Patent

active

045403007

ABSTRACT:
A retractable capless marking pen using an oil ink or an aqueous ink, having a retractable writing member consisting of a small diameter portion and a large diameter portion, and having a constitution capable of preventing the evaporation of the ink by storing the writing head of the writing member hermetically within a sealed elastic cylinder. The constitution comprises a fixed pressing protrusion provided within the sheath, an elastic cylinder enclosing part of the small diameter portion of the writing member, an elastic pressing member having a slanting surface adapted to engage the pressing protrusion and adapted to squeeze the open end of the elastic cylinder as the slanting surface engages the pressing protrusion when the writing member is moved toward the retracted position so that the writing head of the writing member is stored hermetically within the elastic cylinder between the closed front end of the elastic cylinder and the rear end thereof and is sealed by sealing means after the writing head of the writing member has been retracted fully into the sheath.

REFERENCES:
patent: 3525573 (1970-08-01), Fend
patent: 3945734 (1976-03-01), Woodbridge

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