Writing instrument with overflow chamber

Details Writing instrument with overflow chamber Writing instrument with overflow chamber

1994-05-12

1996-09-17

Bratlie, Steven A.

Coating implements with material supply

Material flows through porous tool

Wick feed from within reservoir to tool

401151, 401224, 401225, 401230, B43K 804, B43K 708, B43K 510

Patent

active

055562159

ABSTRACT:
A writing instrument has an ink reservoir, a nib and a feeder which temporarily stores ink which is pushed out of or pulled into the ink reservoir. The ink reservoir communicates with the nib through an ink supplying passage. The feeder chamber communicates with the atmosphere through an atmosphere communicating passage and with the ink reservoir through a capillary flow passage. The cross-sectional area of the capillary flow passage is small enough to hold ink in the capillary flow passage due to a surface tension of the ink. When the pressure in the ink reservoir due to a temperature change, etc., ink flows in the feeder chamber through the capillary flow passage or is returned from the feeder chamber to the ink reservoir. Since the feeder chamber is hollow, its volume is large and has a simple structure, the feeder can be manufactured easily. A low flow resistance of the capillary flow passage provides good response for compensation for a pressure change.

REFERENCES:
patent: 2921558 (1960-01-01), Von Platen
patent: 4509876 (1985-04-01), Hori
patent: 4973180 (1990-11-01), Hori
patent: 5030026 (1991-07-01), Chen

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