Large volume pen

Details Large volume pen Large volume pen

1988-11-07

1990-06-26

Reynolds, Bruce A.

Recorders

Markers and/or driving means therefor

With ink supply to marker

346140A, E01D 1516

Patent

active

049375946

ABSTRACT:
A large volume recording pen suitable for use in graphic recorders and the like includes an elongated cylindrical body defining an internal ink reservoir. A cap is secured to the upper portion of the cylindrical body while the lower portion defines a tapered portion joined to a downwardly extending reduced section tip extension. A conventional ball receptacle is formed at the lower end of the tip extension and supports a captivated recording ball. A pressure ball sized and configured to be received within and freely movable within the interior of the pen body supports a coating of nonwetting material. An ink supply is supported within the cylindrical body and is in communication with the ball receptacle and recording ball by a tip supply passage within the tip extension. The pressure ball is supported upon the upper surface of the ink supply within the cylindrical pen body by the capillary action of the ink. The pressure ball, in its preferred form, is substantially more dense than the ink and therefore provides a substantial downward pressure upon the ink forcing it to the ball receptacle.

REFERENCES:
patent: 4017870 (1977-04-01), Hubbard et al.

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