초록 ▼

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 p

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.

대표청구항 ▼

In combination with a marking instrument of the type having a housing with a marking fluid reservoir therein, vent means for venting the reservoir to ambient air and a marking tip which draws marking fluid from the fluid reservoir, the improvement which comprises: permeable flow rate control means f

In combination with a marking instrument of the type having a housing with a marking fluid reservoir therein, vent means for venting the reservoir to ambient air and a marking tip which draws marking fluid from the fluid reservoir, the improvement which comprises: permeable flow rate control means for creating a desired flow rate of marking fluid from the marking fluid reservoir to the marking tip; and sealing support means for supporting the flow rate control means in the housing and preventing passage of marking fluid between the reservoir and vent means other than through the flow rate control means.