Screw-type writing instrument having expansion and...

Details Screw-type writing instrument having expansion and... Screw-type writing instrument having expansion and...

2005-12-16

2010-06-01

Walczak, David J. (Department: 3751)

Coating implements with material supply

Projectable and retractable tool

By screw mechanism

C401S099000, C015S184000

Reexamination Certificate

active

07726894

ABSTRACT:
The present invention provides a screw-type writing instrument having an expansion and contraction function in which an outer shaft cam, a cartridge holder and an inner shaft cam are coupled in a double screw manner, so that the expansion or contraction of the writing instrument and the advancing or retracting operation of a pen core can be simultaneously conducted, thus being convenient to use, and which, thanks to the contractible structure, is convenient to carry and hold.

REFERENCES:
patent: 3597100 (1971-08-01), Ganz
patent: 6273627 (2001-08-01), Mittersinker et al.
patent: 6497524 (2002-12-01), Kim
patent: 6764239 (2004-07-01), Kim
patent: 6942411 (2005-09-01), Kato
WIPO, International Search Report for PCT/KR2005/004358.

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