Flow control for writing instruments

Details Flow control for writing instruments Flow control for writing instruments

1992-06-23

1994-03-01

DeMille, Danton D.

Coating implements with material supply

Material flows through porous tool

Wick feed from within reservoir to tool

401205, 401219, B43K 518, B43K 710, B43K 806

Patent

active

052901165

ABSTRACT:
An ink flow control mechanism is provided to prevent ink leakage or excessive ink discharge of a writing instrument particularly utilizing a capillary stick for delivering ink from an ink reservoir to a writing tip. A porous polytetrafluoroethylene (PTFE) membrane, which is permeable to moisture vapor and air molecules while performing hydrostatic resistance, is used to wrap a first portion of the capillary stick to prevent ink leakage to allow air to enter the ink reservoir to balance pressure drops. A foam is further used to wrap a second portion of the capillary stick. The ink flow rate can be adjusted by a selection of foams with different porosity density. The foam is in addition capable of absorbing an extra amount of ink flowing into the capillary stick to prevent leakage.

REFERENCES:
patent: 2140009 (1938-12-01), Hand
patent: 3922100 (1975-11-01), Saito
patent: 4057354 (1977-11-01), Bajusz et al.
patent: 4588319 (1986-05-01), Niemeyer
patent: 4671692 (1987-06-01), Inaba
patent: 4770558 (1988-09-01), Frietsch
patent: 4973182 (1990-11-01), Nakano

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