Retractable writing implement

Details Retractable writing implement Retractable writing implement

2011-07-05

2011-07-05

Huson, Gregory L (Department: 3751)

Coating implements with material supply

Projectable and retractable tool

Including retraction spring and projected-position retainer

C401S109000, C401S099000

Reexamination Certificate

active

07972072

ABSTRACT:
To prevent faint writing or writing failure from occurring during a writing operation due to back shock and to reduce shock sound by using a simple structure, a pressure contact member protrudes from one surface or both surfaces on the side of a shaft tube and a knock body so as to come into sliding contact with each other, parts on the side of the shaft tube and the knock body being opposed to each other in a radial direction. Accordingly, even when the part on the side of the knock body retreats with respect to the part on the side of the shaft tube in terms of a releasing operation, a retreat speed of an ink tank becomes slow due to a friction resistance of the pressure contact member, and thus back shock remarkably reduces. As a result, ink does not flow to the ink tank in a reverse direction due to air introduced from a writing tip portion, and shock sound generated when the retreating ink tank returns to a normal position reduces.

REFERENCES:
patent: 2928373 (1960-03-01), Esterow
patent: 4991988 (1991-02-01), Snell et al.
patent: 5413428 (1995-05-01), Kageyama
patent: 6039484 (2000-03-01), Kageyama et al.
patent: 6089775 (2000-07-01), Yokouchi
patent: 6280110 (2001-08-01), Lin
patent: 2001/0031172 (2001-10-01), Abe
patent: 2002/0170462 (2002-11-01), Terai
patent: 9-164794 (1997-06-01), None
patent: 2004-17358 (2004-01-01), None
patent: 2004-209881 (2004-07-01), None
patent: 2005-199512 (2005-07-01), None
English language Abstract of JP 2004-17358, Jan. 22, 2004.
English language Abstract of JP 2005-199512, Jul. 28, 2005.
English language Abstract of JP 9-164794, Jun. 24, 1997.
English language Abstract of JP 2004-209881, Jul. 29, 2004.

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