Chip for a ball point pen

Details Chip for a ball point pen Chip for a ball point pen

2001-01-04

2001-10-09

Huson, Gregory L. (Department: 3751)

Coating implements with material supply

Including ball, roller or endless-belt tool

Ball

C401S216000

Reexamination Certificate

active

06299375

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a chip for a ball-pointed pen, and more particularly a chip for a ball-pointed pen which is suitable for such a ball-pointed pen as one containing shearing reduced viscous ink.
2. Description of the Related Art
In this kind of chip for a ball-pointed pen of the prior art, there is provided a chip in which a transfer ball held in a ball house at the extremity end of a holder is resiliently biased by a resilient member from a rear part of it, the resilient member is received by a sleeve fixed to the rear part in the holder and the transfer ball is closely contacted with the inward directed extremity end edge within the ball house in order to prevent a writing state from becoming blurred or a non-writing state from occurring or avoid an ink leakage and the like.
However, since the refill having the chip for the ball-pointed pen at its extremity end is manufactured at the stage in which the chip is fitted to an ink-storing pipe filled with ink in advance, some air bubbles contained during manufacturing of ink, or air bubbles entered when the chip is fitted or some fine air bubbles generated after collapsing of these air bubbles and the like are left during the manufacturing stage.
Then, these air bubbles are deaerated at a centrifugal separating processing at its subsequent stage. That is, the ink storing pipe having the chip fitted thereto is applied to the centrifugal separating machine under a state in which the transfer ball side of the extremity end of the chip is faced to or directed to the centrifugal direction. Then, the ink having a high specific weight is collected at the extremity end in the chip and in turn the air bubbles having a low specific weight are moved to the rear part of the ink-storing pipe and deaerated at the opening part of the rear end of it.
However, in accordance with the aforesaid prior art chip for a ball-pointed pen, the air bubbles remained in the chip when the refill is manufactured are engaged with the circular front end surface of the sleeve receiving the resilient member and do not move more rearwardly, resulting in that the air bubbles are sometimes left in the holder and it has been felt anxious about producing some inferior operations such as becoming blurred of writing or non-writing due to the residual presence of the air bubbles.
SUMMARY OF THE INVENTION
Thus, the present invention has been invented in view of the aforesaid circumstances found in the prior art and it is an object of the present invention to provide a high quality chip for a ball-pointed pen in which some air bubbles are not left during the centrifugal separating process when the refill is manufactured.
As the technical means of the present invention for resolving the aforesaid problem, claim
1
provides a chip for a ball-pointed pen in which a transfer ball held in a ball house at the extremity end in a holder is biased from a rear part by a resilient member characterized in that said resilient member is received at its rear end by a plurality of small projections integrally arranged in a circumferential direction at an inner circumferential surface of a metallic holder.
In accordance with the aforesaid technical means, since the resilient member is received only by a plurality of small projections in a circumferential direction, a plurality of small projections and the inner circumferential surface of the holder become scarcely hindrance when deaeration is performed in the centrifugal separating processing at the manufacturing stage of refill, resulting in that the air bubbles in the holder are moved smoothly in a rearward direction.
In addition, as already described in claim
2
, said plurality of small projections are made as cut pieces formed by a broach machining at the rear side of the holder, resulting in that the small projections receiving the resilient member can be formed easily and within a short period of time. In this case, it is preferable that the holder is formed by material having a high rigidity so as to prevent the cut pieces from being fallen or some cut powder from being generated.


REFERENCES:
patent: 3554660 (1971-01-01), Woods
patent: 4198172 (1980-04-01), Meislik
patent: 5421664 (1995-06-01), Okamoto
patent: 5876142 (1999-03-01), Furukawa
patent: 5906447 (1999-05-01), Horikoshi
patent: 5915866 (1999-06-01), Furukawa
patent: 5929135 (1999-07-01), Wasai et al.
patent: 0621141 (1994-10-01), None
patent: 0712737 (1996-05-01), None

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