Ballpoint pen having a backflow preventing mechanism

Details Ballpoint pen having a backflow preventing mechanism Ballpoint pen having a backflow preventing mechanism

1996-03-11

1998-01-20

Bratlie, Steven A.

Coating implements with material supply

Including ball, roller or endless-belt tool

With flow-regulator

401141, 401142, 401209, 401202, 401213, B43K 700, B43K 710

Patent

active

057094934

ABSTRACT:
A ballpoint pen for use with ink having thixotropic (shear viscosity decreasing properties) and a joint for regulating the flow of the ink to the pen's tip through an entrance in the tip. The joint includes a valve chamber which is disposed in an approximately middle portion of the joint with respect to the axial direction thereof for holding a ball therein with play and has a ball seat in the rear part thereof, a cavity in front of the valve chamber and a conduit communicating with an ink reservoir. In this arrangement, in order to allow the ball to fit on the ball seat to prevent ink from flowing backward when the ballpoint pen is oriented upward and in order to ensure an ink flow when oriented downward, the joint portion is constructed such that an axis of path holding the ball valve with play, defined by the top surfaces of the ribs formed on the peripheral wall of the valve chamber, is made eccentric to the axis of the entrance and a channel is provided by the ribs on one side of the valve chamber space for the ink to flow therethrough.

REFERENCES:
patent: 3792932 (1974-02-01), Henriksen
patent: 4911571 (1990-03-01), Inoue et al.
patent: 5127754 (1992-07-01), Mase
patent: 5348411 (1994-09-01), Ozu et al.

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