Coating implements with material supply – Including ball – roller or endless-belt tool – Ball
Patent
1987-06-17
1989-06-27
Apley, Richard J.
Coating implements with material supply
Including ball, roller or endless-belt tool
Ball
401216, B43K 700, B43K 710
Patent
active
048424331
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Technical Field
This invention relates to a pen tip structure which includes a rotatable ball socketed between the lip of the pipe and the end of an inner core.
2. The Prior Art
Ball point pens in which the ball at the pen tip part is rotated by frictional resistance during its writing movement so as to draw ink for writing are in, wide use throughout the world. One such known ball point pen utilizes a pen tip structure composed of a ball bearing shaft, a ball holding part within the ball bearing shaft, and a rotatable ball socketed between a bottom surface of the ball holding part and the tip of the ball bearing shaft, the bottom surface of the ball holding part being conically shaped and having an ink passage at its apex. Another known pen tip structure is constructed as shown in FIG. 47, wherein a ball receiving core (51) having a flat bottom surface is fixed in a ball holding pipe (50), with an axial ink passage space (52) being formed therebetween, and a ball (54) is rotatably held in a ball wrapping part (53) which communicates with the ink passage space (52). However, a pen tip structure which utilizes a ball holding part having a conical bottom surface has the following disadvantages:
PROBLEMS IN MANUFACTURING
There are some problems in machining and forming of the ball holding part and an ink passing hole, that is, a high precision in the cutting operation is required in case the ball receiving shaft is made of metal, and a forming mold with a high machining accuracy is required in case the ball receiving shaft is made of plastic material.
PROBLEMS IN ROTATION OF BALL
There are some problems in the writing operation of the pen tip caused by the conical shape of the bottom surface of the ball holding part; that is, the rotation of the ball will be hindered due to a wedging action caused by its biting into the conical bottom surface in proportion to its writing pressure. The result is a poor ink drawing characteristic and a blurred writing phenomenon. This type of pen tip structure is not suitable for a high speed writing operation.
On the other hand, a pen tip structure wherein the ball holding part has a totally flat bottom surface has the following disadvantages:
PROBLEMS IN INK GUIDING OPERATION
The ball receiving part in the ball receiving core (51) at the ball wrapping part (53) may generate a so-called capillary guiding vacant area (61) where no link capillary guiding action is performed in a space (60) formed among an outer side part (57) of the flat bottom surface (56), a surface part (58) of a ball (54) near the outer side and an inner surface part (59) of the ball holding pipe (50). This capillary guiding vacant area (61) may hinder capillary movement of the ink along the surface (58) of the ball (54) and reduce or eliminate the scraping of ink on the surface (58) while the ball (54) is rotated. This phenomenon may occur due to an air winding phenomenon caused by rotation of the ball and a forming of the capillary guiding vacant area (61) due to accumulation of air in the area (60) fed into the ball wrapping part (53). As a result, the holding capacity of the ink in the ball wrapping part (53) is decreased, a drain-back may occur, a blurring of the ink may occur during initial writing, a poor return-back characteristic of ink may occur after the pen tip has been inverted, the supply of ink to the ball will be unstable, excessive blurring of the ink during high-speed writing will occur, and the ink may not follow a rapid change in writing direction.
In view of the facts described above, it is an object of the present invention to provide a pen tip structure having no problems of the conventional type of pen tip structure in which all anti-drain back characteristic of ink, initial writing feature, a return-back feature of ink, high-speed writing characteristic, a stable ink supplying feature, a rotating feature of the ball and a manufacturing characteristic of the ball are superior.
It is another object of the present invention to provide a pen tip s
REFERENCES:
patent: 2551490 (1951-05-01), Ferst et al.
patent: 3537801 (1970-11-01), Corte
patent: 3781123 (1973-12-01), Linz et al.
patent: 3904297 (1975-09-01), Hori
patent: 3966336 (1976-06-01), Lotfallah
patent: 4139313 (1979-02-01), Hori
patent: 4529329 (1985-07-01), Hirabayashi et al.
patent: 4603994 (1986-08-01), Mitsuda et al.
Apley Richard J.
Bender David J.
Teibow Co., Ltd.
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