Marking instrument

Details Marking instrument Marking instrument

1984-10-25

1986-05-13

Apley, Richard J.

Coating implements with material supply

Material flows through porous tool

With flow-regulator

401198, 401199, 401206, 401260, B43K 500

Patent

active

045883190

ABSTRACT:
The flow of ink in a marking pen is metered by an internal flow restriction. The pen is of the type having a housing, including an ink reservoir, and a marking tip which draws ink from the ink reservoir by capillary action. The reservoir is vented to allow air to be drawn into the reservoir by the pressure drop created when ink is drawn out of the reservoir to the marking tip. A foam flow restrictor is positioned in the housing between the air vent and the ink reservoir to create a desired air flow rate into the reservoir and, in turn, a desired capillary action flow rate of the ink from the reservoir to the marking tip.

REFERENCES:
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patent: 4145148 (1979-03-01), Fukmoka
patent: 4317639 (1982-03-01), Kato
patent: 4382707 (1983-05-01), Anderka
patent: 4496258 (1985-01-01), Tanaka et al.

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