Tip mechanism for knock-type ballpoint pen

Details Tip mechanism for knock-type ballpoint pen Tip mechanism for knock-type ballpoint pen

1999-09-13

2001-02-27

Eloshway, Charles R. (Department: 3751)

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

C401S216000

Reexamination Certificate

active

06193429

ABSTRACT:

BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a tip mechanism for a knock-type ballpoint pen and, more particularly, to a tip mechanism for a knock-type ballpoint pen which can perform a ball pressurizing function in an appropriate manner.
(b) Description of the Related Art
Generally, ballpoint pens make use of water gel ink or oil gel ink which has a high viscosity at a static state but has a reduced viscosity at writing with the application of shearing force through rotation of the ball. Such ballpoint pens are classified into a tip covering type of exposing a tip portion to the outside with a separate tip cover at all times and a knock type of exposing the tip portion to the outside only at writing without the separate tip cover.
The usual knock-type ballpoint pen includes a barrel-shaped case with a one-sided conical portion and an opposite sided knocking member, an ink storing tube disposed within the barrel-shaped case, and a tip mechanism with a ball positioning end and an opposite end inserted into the ink stroring tube. The tip mechanism is provided with a small metal ball and an elastic member for pressurizing the ball.
In this structure, when the pen is put on a paper, the ball is pressed and an opening path is made around the ball. At this time, ink fed to the tip mechanism from the ink storing tube flows over the ball through the opening path and is transferred onto the paper. When the pen is withdrawn from the paper, the elastic member pressurizes the ball and the opening path is closed to intercept flowing of ink.
In such a tip mechanism, a coil spring is used for the elastic member with a linearly extended ball-pressing portion which is adapted to the narrow space of an ink guide hole. The linearly extended ball-pressing portion conventionally has a diameter of 0.1~0.3 mm. Therefore, the ball-pressing portion is formed with a sharply pointed shape which is liable to intervene rotation of the ball and scratch or crack an external surface of the ball. This prevents the ball from smoothly rolling with a fluent ink flowing and causes ink spot at writing or disconnected portions at line drawing.
SUMMARY OF THE INVENTION
Accordingly, the present invention is directed to a tip mechanism for a knock-type ballpoint pen which substantially obviates one or more of the problems due to limitations and disadvantages of the related art.
An object of the present invention is to provide a tip mechanism for a knock-type ballpoint pen which can perform the ball pressurizing function with a suitably processed ball pressing part without friction loss of the ball.
To accomplish this object and other advantages, the tip mechanism for a knock type ballpoint pen with an ink container includes a tip body having an inner ink-guide hole and top and bottom end portions. The top end portion of the tip body is fitted within the ink container. A ball receptor is formed at the bottom end portion of the tip body. A ball is disposed in the ball receptor to be rotated. The ball is partially exposed to the outside. An elastic member is inserted into the ink-guide hole of the tip body. The elastic member has a ball pressing part for pressing the ball toward the outside. The ball pressing part is formed with a curved shape or a triangle or trapezoid shape. The shape of the ball pressing part is processed by bending the ball pressing part at a predetermined angle.


REFERENCES:
patent: 554189 (1896-02-01), Kochendarfer
patent: 1839160 (1931-12-01), Nissen, Jr.
patent: 967607 (1950-11-01), None
patent: 1071169 (1954-08-01), None
patent: 500193 (1954-11-01), None
patent: 4-06271 (1992-01-01), None
patent: 4-25388 (1992-03-01), None
patent: 4-53782 (1992-07-01), None
patent: 4-53781 (1992-07-01), None
patent: 5-47503 (1993-08-01), None
patent: 6-279450 (1994-02-01), None
patent: 6-187464 (1994-08-01), None
patent: 7-020657 (1995-02-01), None
patent: 7-098051 (1995-03-01), None
patent: 7-055516 (1995-03-01), None
patent: 8-209108 (1996-07-01), None
patent: 97-25261 (1997-08-01), None
patent: WO97/4420 (1997-11-01), None

Affiliated with

Also associated with

Rating

Tip mechanism for knock-type ballpoint pen does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Tip mechanism for knock-type ballpoint pen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Tip mechanism for knock-type ballpoint pen will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2562552