Writing unit for a cartridge fountain pen

Details Writing unit for a cartridge fountain pen Writing unit for a cartridge fountain pen

1992-11-25

1994-12-13

Bratlie, Steven A.

Coating implements with material supply

Bifurcate pointed nib tool

Including reservoir and feeder

401227, 401229, 401242, B43K 518

Patent

active

053724453

ABSTRACT:
A writing unit for a cartridge fountain pen comprising an ink feeder 3, a writing nib 1 mounted to the forward end portion of the ink feeder, and a gripping piece 2 enclosing the rearward end portion of the ink feeder. A capillary gap 3a extends along the longitudinal length of the rearward end portion of the ink feeder and to the writing nib, and an air channel 3c of generally triangular outline overlies the gap 3a. To compensate for an expansion of air in the writing unit caused by temperature fluctuations, a plurality of lamellar collecting chambers 3e are formed in the ink feeder along each side of the capillary gap, with each collecting chamber communicating with one of the two upper corners of the triangular air channel via an overflow capillary 3d. Also, to avoid a dripping or leakage of ink after tapping the cartridge, there is provided a fluid control valve which communicates with one of the two upper corners of the triangular air channel at a location adjacent the writing nib. The control valve acts to admit air into the air channel and thus into the cartridge while the ink initially flows along the corners of the triangular air channel by capillary action and until the ink reaches the control valve.

REFERENCES:
patent: 1483675 (1924-02-01), Peters
patent: 3402008 (1968-09-01), Green
patent: 3411854 (1968-11-01), Rosler et al.

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