Cover for scriber

Details Cover for scriber Cover for scriber

1976-09-22

1978-06-20

Pellegrino, Stephen C.

Coating implements with material supply

Bifurcate pointed nib tool

Including reservoir and feeder

401242, B43K 518

Patent

active

040959074

ABSTRACT:
A capillary writing pen of the type having an expansion or compensation chamber intermediate the ink reservoir and ambient air. The expansion chamber is improved such that inadvertent flowing of ink reservoir to the capillary pen tip due either to pressure or temperature changes is avoided. The interior wall of the expansion chamber is profiled as a contiguous series of transverse indentations which provide successive expansion areas for entrapment of air and constrictive areas where menisci of ink are formed. The forming of the menisci entraps air bubbles within the ink and, accordingly, provides increased resistance to capillary flow of ink.

REFERENCES:
patent: 637439 (1899-11-01), Wolter
patent: 2521657 (1950-09-01), Severy

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