JPS5924556Y2 - Tip of water-based ballpoint pen - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a tip of a water-based ballpoint pen.

BACKGROUND ART Conventionally, the tip of a water-based ballpoint pen is made of a plastic material or a metal material, and a ball holding part, an ink guide groove, etc. are integrally molded inside.

However, those made from processed plastic materials have the disadvantage that the ball holding part is thin and the ball falls off when writing pressure is increased due to the elasticity of the plastic itself. Since nickel silver or the like is used, which has good machining efficiency such as cutting, it has drawbacks in terms of wear resistance and corrosion resistance.

In view of these circumstances, recent efforts have been made to use metal capillary tubes, to rotatably hold the ball at the tip, and to create an ink passage between the inner wall of the tube and the inner wall of the tube by inserting a linear body loosely inside. Chip tubes have been used, but none of them have achieved satisfactory performance.

If you write shorthand, the ink tracking may be insufficient, resulting in unclear handwriting, or if the ball is left in an environment with a significant temperature difference, if the ball is left facing upward, or if it is subjected to strong impact during transportation or other operations, the handwriting may become blurry or blurred. Defects such as inability to write often occurred.

The present invention relates to a tip of a water-based ballpoint pen that eliminates the above-mentioned conventional drawbacks, and particularly to a tip of a water-based ballpoint pen that is suitable for fine writing.

Details will be explained below with reference to the drawings.

FIG. 1 and FIG. 2 show longitudinal cross-sectional views of an embodiment of the present invention,
FIGS. 3 to 6 are cross-sectional views of the respective main parts.

The present invention is a tip of a water-based ballpoint pen that is configured to function effectively by combining a metal tip tube (■), a porous ink guide core (0), and a cylindrical holder (■) as described below. .

■The ball at the tip of the thin metal tube■ is held in a rotatable manner.
Inside, a plastic linear body ■ whose front end surface is a ball holder ■ is inserted in a state protruding from the rear end of the thin tube.
The ball receiver at the tip is fixed in pressure contact with three or more dot-like protrusions (2) in the axial direction that protrude from the metal capillary wall at approximately the same axial position near the seat, and is linearly connected to the inner wall of the capillary (2). The ink passage (■) is formed between the body (■) and the ink passage (■).

In the above, the ball (2) is a commonly used cemented carbide ball, ruby ball, etc., and a metal pipe made of stainless steel or the like is effective as the metal tube for holding the ball.

The linear body (2) is made of a plastic material such as polyacetal resin or polyamide resin, and those having a circular cross section, a polygonal shape, or a shape having irregularities are used as appropriate.

Further, the ball receiver may be grooved in the vicinity of the seat.

(See Figures 2 and 5) The dot-like protrusions (■) are formed by inserting the plastic linear body (■) into a predetermined position inside the metal thin tube (■) and then pressing it from the outside of the thin tube with a processing tool such as a punch. At the same time, the linear body (2) is pressed and fixed.

In the metal tip tube (■) obtained in this way, the plastic linear body (■) and the ball receiver are fixed in pressure contact near the seat (■), so the distance between the locks is very small, and the metal thin tube (■) and the plastic linear body (■) are mutually connected. There are no dimensional variations due to differences in linear expansion coefficients between different materials or water absorption of the plastic linear body, and the contact between the seat and ball of the ball holder always functions smoothly.

The cylindrical holder (2) functions to effectively insert and fix both the tip cylinder (2) and the porous ink guide core 0, thereby providing stable performance at all times.

Inside, a front hole [phase] opens at the front end surface of the axis, followed by a small diameter hole 0 located at the center and a rear hole 0 opened at the rear end surface.

The small diameter hole 0 has a smaller diameter than the front hole [phase] and the rear hole 0, and is larger than the diameter of the linear body, and a plurality of axial ink guide grooves 0 are provided on the inner wall of the hole 0 in the axial direction. ] and 0.

The rear end side of the metal tip tube (3) is inserted into the front hole (phase) of the holder (2), and the rear end protrusion (2) of the linear body is inserted into the small diameter hole (0).

The rear end surface of the linear body is configured to be in contact with the front end surface of the porous ink guide core 0 fitted into the rear hole 0, or to face it with a slight gap.

At this time, if the ink guide core 0 is made of fiber or the like, it is also effective to contact it with the end of the linear body (2) partially bitten into the core.

Conventionally, in a tip cylinder in which a linear body is inserted into a metal capillary body to form an ink passage between the tube wall and the linear body, ink flowability often fluctuates due to subtle swings or eccentricity of the linear body. Was.

In the present invention, the leading edge of the linear body is effectively fixed by the above-mentioned dot-like protrusion (3) to exhibit the above-mentioned effect, and the rear edge of the linear body is inserted into the small diameter hole to allow the linear body to oscillate. At the same time, the ink in the ink guide wick is set to be communicated with the ink passage (2) by the ink guide groove 0 formed on the inner wall.

The porous ink guide core 0 mentioned above is a resin-processed fiber, a plastic porous body with continuous pores, a plastic molded core with a plurality of capillary grooves formed in the axial direction, etc., each having an appropriate liquid retention property and ink guide. Those with both genders are used.

As mentioned above, by interposing a porous ink guiding core, the ink tracking is insufficient when the tip tube is directly connected to the ink storage section, and when the ball is left facing upward. , various problems have been resolved, and a stable and abundant supply of ink can always be supplied to the writing tip.

As described above, the present invention effectively connects the metal tip and the ink guiding core with a specific holder, and ink from the ink reservoir is introduced through the porous ink guiding core to form a plurality of holes formed on the inner wall of the small diameter hole. The present invention provides a tip of a water-based ink ballpoint pen in which the ink is transmitted to the ink passage in the tip cylinder through the ink guide groove and supplied to the back of the ball, thereby eliminating the conventional defects as described at the beginning.

[Brief explanation of the drawing]

1 and 2 show longitudinal cross-sectional views of an embodiment of the present invention, FIG. 3 is a line A-A, FIG. 4 is a line B-B, and FIG. 5 is a line C--
C line, FIG. 6 is a sectional view taken along D-D line. DESCRIPTION OF SYMBOLS 1...Metal tip tube, 2...Metal thin tube, 3...Ball, 4...Plastic linear body, 5...Ball holder is seat, 6...Rear end protrusion, 7... ...Punctate projection, 8...
- Ink passage, 9... Cylindrical holder, 10... Front hole, 11... Small diameter hole, 12... Rear hole, 13...
・Ink guide groove, 14... Ink guide core, 15...
slight gap.

Claims (1)

[Scope of utility model registration request] A ball is rotatably held at the tip of the metal thin tube, and a plastic linear body is inserted inside with the front end surface serving as a ball holder, forming an ink passage between the inner wall of the thin tube and the back of the ball. In a tip cylinder of a type that allows ink to be drawn out at the same time, the plastic linear body is inserted in a state protruding from the rear part of the thin tube, and the plastic linear body is inserted in the axial direction so as to protrude from the metal thin tube wall at approximately the same position in the axial direction near the tip. The metal tip tube and the inside of the mouth are fixed by pressure contact at three or more dot-like protrusions, and the center has a through hole with a smaller diameter than the front and rear parts and the same diameter as the linear body. , a cylindrical holder in which a plurality of axial ink guide grooves are formed in the inner wall forming the small diameter hole and communicate with the large diameter holes in the front and rear parts; and (c) a porous ink guide core. Insert the rear end side of A into the front hole of the mouth, and insert the rear end protrusion of the linear body A into the small diameter hole of the mouth, and the rear end surface of the linear body A is inserted into the mouth. The tip of a water-based ballpoint pen is configured to be in contact with the front end surface of the pen inserted into the rear hole of the pen, or to face it with a slight gap.