Writing instrument

Details Writing instrument Writing instrument

1992-07-31

1994-07-26

DeMille, Danton D.

Coating implements with material supply

Including means to apply material-moving force

In or at feeder

401206, 401264, 401273, B43K 518

Patent

active

053323262

ABSTRACT:
An ink reservoir and a slide plug are slidably provided in a pen barrel. The ink reservoir is filled with liquid ink. The slide plug divides the interior of the pen barrel into an ink region and an air region. A writing tip is provided in the distal end portion of the pen barrel so as to be movable axially. An elastically deformable diaphragm member is provided in the pen barrel. The diaphragm member divides the interior of the pen barrel into a writing tip side region and an ink reservoir side region and is elastically deformed toward the ink reservoir when a writing pressure is applied to the writing tip. The diaphragm member is formed with an opening which opens to cause the ink reservoir to communicate with the writing tip when the diaphragm member is elastically deformed. Upon writing, the diaphragm member is elastically deformed to pressurize the ink in the ink reservoir. In this case, the slide plug slides to restrict the upper limit of the ink pressure to a predetermined value. Ink under the predetermined pressure is supplied from the ink reservoir to the writing tip through the opening.

REFERENCES:
patent: 2762337 (1956-09-01), Beckwith
patent: 2913749 (1959-11-01), Ayres
patent: 2996750 (1961-08-01), Chalet
patent: 3397939 (1968-08-01), Berry
patent: 4453651 (1984-06-01), Braithwaite et al.
patent: 4693623 (1987-09-01), Schwartzman

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