JPH0541912Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a refill for a writing instrument that accommodates a batting that absorbs water-based ink.

(Prior art) A filling that absorbs water-based ink is housed, and a writing part such as a ball or a fiber core is provided at the front end of the filling to which ink is transferred from the filling, and the writing part is exchangeably housed in the barrel of a writing instrument and used. In the refill for writing instruments that is currently available, the filling material can be stored in a predetermined position within the refill.
No. 123276 is known.

(Problem to be solved by the invention) However, in the aforementioned Utility Model Application No. 60-123276, three or more inward protrusions facing the axial center are formed on the circumferential wall approximately parallel to the axis of the reel. Since the inner protrusion supports the outer periphery of the front end of the batting, when the batting moves back and forth due to vibrations or shocks caused by use, carrying, or dropping, the front end will contract, causing the fibers in that part to shrink. As the density increases, the flow of ink to the relay core is suppressed, resulting in problems such as so-called ink fading.

(Purpose of the invention) The present invention was devised in view of the above-mentioned problems, and it is an object of the present invention to provide a refill for a writing instrument that allows the filling to be positioned and prevents contraction of the front end portion as much as possible.

(Means for solving the problem) A batting that absorbs water-based ink is housed in the large diameter part,
In a refill for a writing instrument, which has a writing section at the front end of the reduced diameter part obtained by reducing the diameter of the end of the large diameter part, the inner wall of the connecting part between the front end of the large diameter part and the rear end of the reduced diameter part is provided in a plane perpendicular to the axis. An inward protrusion is provided that faces toward the rear of the refill so that the apex is located and has an appropriate distance between it and the inner wall of the large diameter part, and the front end of the batting is supported at the apex of the inward protrusion. The purpose of this invention is to provide a refill for a writing instrument, which is characterized by its characteristics, and to meet the above-mentioned purpose.

(Example) Hereinafter, the present invention will be described in detail based on an example shown in the accompanying drawings.

Figures 1 and 2 show an example in which the refill of the present invention is applied to a water-based ballpoint pen, and reference numeral 1 is a pipe-shaped refill made of metal such as stainless steel or nickel silver, and is made of fibers such as polyester. a large-diameter portion 1a that accommodates a batting 2 that is made of a rod-shaped bundle and can absorb water-based ink; a medium-diameter portion 1b that is narrowed forward (to the left in the figure) from the large-diameter portion 1a;
A small diameter portion 1 that is further narrowed forward from the medium diameter portion 1b.
It is composed of c. Kayou refeel 1
The method of gradually narrowing the pipe base material to the desired diameter by swaging is the most productive method and can be produced at low cost. may be adopted.

Further, between the large diameter portion 1a and the medium diameter portion 1b of the refill 1, there is a vertex 3a on a plane perpendicular to the axis.
An inward protrusion 3 facing rearward is provided with an appropriate gap 4 between it and the inner surface of the large diameter portion 1a in which the batting 2 is accommodated. In forming the annular inward protruding portion 3 as shown in FIG. 1, after forming the re-feel 1 consisting of a large diameter portion 1a, a medium diameter portion 1b, and a small diameter portion 1c as shown in FIG. Insert the metal 5 into the large diameter part 1a, press the medium diameter part 1b and the small diameter part 1c downward with the push tool 6', and then press the step 6 between the large diameter part 1a and the medium diameter part 1b into the mandrel 5. What is necessary is to deform it inwardly along the shape of the tip.

The shape of the inwardly protruding portion 3 mentioned above is not limited to the example shown in FIG. 1, and can be modified in various ways. For example, as shown in FIG. In this case, the above-mentioned core deposit 5
Press the punch 7 instead of the push tool 6' against the stepped portion 6,
It is preferable that the portion is deformed inwardly along the shape of the tip of the punch 7. Further, as shown in FIG. 5, the apex 3''a of the inwardly protruding portion 3'' may be formed into a flat surface. Any method may be adopted. 8 is a chip that can rotatably hold the ball 9, and the small diameter portion 1c
It is fitted and fixed in the opening. 10 is the above-mentioned batting 2
It is a relay core consisting of a fiber bundle or a resin rod-shaped body, with the rear end inserted into the tip 8 and the front end inserted into the tip 8, and transmits the water-based ink occluded in the batting 2 to the ball 9, which is the writing part. . 11 is the medium diameter portion 1b
This is an air hole bored in the stepped portion 12 between the small diameter portion 1c and the small diameter portion 1c, through which air enters and exits in response to pressure changes within the refill 1. Although not shown, a tail plug is fitted and fixed to the rear end opening of the refill 1, and the above-mentioned batting 2 has its rear end surface covered with the tail plug.
The front end surfaces are supported by the apexes 3a of the inwardly protruding portions 3, respectively.

The ballpoint pen refill configured as described above has its rear end supported on the inner bottom surface of the barrel 13 with or without an elastic body such as a spring (not shown), and can be detachably attached to the barrel 13. The attached tip body 14 supports the stepped portion between the large diameter portion 1a and the medium diameter portion 1b (the back surface of the inward protruding portion 3), and the shaft cylinder 13 is moved with the front end of the tip 9 protruding from the tip body 14.
and housed within the acrosome 14.

Therefore, according to refeel 1 as mentioned above,
The batting 2 is supported at apexes 3a, 3'a, 3''a of inward protrusions 3, 3', 3'' located slightly inward from the outer peripheral edge of the front end surface on a plane perpendicular to the axis. Here, the front end surface of the batting is in a state where the ends of the fibers are exposed and is a surface with some degree of fine unevenness, but each vertex 3a, 3'a, 3''a is appropriately spaced between the inner wall of the refill. Because it has an interval, this vertex 3
a, 3'a, 3''a can be slightly dug into the end face of the batting, which not only allows for accurate positioning of the batting 2, but also prevents the batting from being damaged by vibrations and shocks caused by use, carrying, or dropping. The outer peripheral edge of the front end surface of the batting is supported to increase the density near the insertion part of the relay core 10, which suppresses the shrinkage effect that the front end part receives when the batting 2 moves back and forth, especially the flow of ink to the relay core 10. Since this can be prevented as much as possible compared to conventional methods, it is possible to achieve good ink transmission.

By the way, the shrinking action of the filling 2 at the insertion portion of the relay core 10 described above is caused by the inwardly protruding portions 3, 3',
It is also possible to completely prevent this from occurring by making the inner wall surface of 3'' parallel to the axis.
If capillary force is generated in the gap 4 provided between the inner surface of the diameter portion of This can be achieved, and it is also possible to prevent ink from dripping inside the batting 2.

In the above-mentioned embodiments, the present invention was shown as an aqueous ballpoint pen using a ball 9 as a writing part, but it is of course applicable to a refill for a writing instrument having a fiber core or other writing part.

(Effects of the invention) As described above, according to the invention, the apex is located in the front part of the re-reel on a plane perpendicular to the axis,
In addition, an inwardly protruding portion facing rearward with an appropriate gap between it and the inner surface of the diameter portion in which the batting is accommodated is provided, and the front end surface of the batting is supported at the apex of the inwardly protruding portion, so that the positioning of the batting is facilitated. Not only can this be done accurately, but it also suppresses the contraction effect that the front end part receives when the batting 2 moves back and forth due to vibrations and shocks caused by use, carrying, or dropping, and in particular, suppresses the flow of ink to the relay core. It is possible to prevent the increase in density in the vicinity of the relay core insertion portion as much as possible, and to achieve good ink transmission.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a sectional view of one embodiment, FIG. 2 is a sectional view taken along line A-A in FIG. FIGS. 4 and 5 are sectional views showing main parts of other examples of the inwardly protruding part. 1... refill, 2... batting, 3,3',
3″,... Inward protrusion, 4... Gap, 9... Writing part (ball).

Claims (1)

[Scope of utility model registration request] The large diameter part accommodates a batting that absorbs water-based ink,
In a refill for a writing instrument, which has a writing section at the front end of the reduced diameter part obtained by reducing the diameter of the end of the large diameter part, the inner wall of the connecting part between the front end of the large diameter part and the rear end of the reduced diameter part is provided in a plane perpendicular to the axis. An inward protrusion is provided that faces toward the rear of the refill so that the apex is located and has an appropriate distance between it and the inner wall of the large diameter part, and the front end of the batting is supported at the apex of the inward protrusion. Features a refill for writing instruments.