JPS5914236Y2 - Ink guide core fixing device for writing instruments - Google Patents

Description

[Detailed description of the invention] The present invention relates to a device for fixing an ink guide wick in a writing instrument.More specifically, the invention relates to a device for fixing an ink guide wick in a writing instrument. A device that fixes the deformed part of the stopper by firmly abutting or biting into the inner wall of the tip hole and around the ink guide core by fitting the held lead holder into the tip hole and deforming it by pressing on the rear end surface. It is related to.

Various structures for fixing the core have been proposed in the past, and among them, Japanese Utility Model Publication No. 4161/1977 discloses a structure in which a pin is driven into the fiber core to fix the fiber core.

Looking at this from a method standpoint, it requires a secondary processing step of driving the pin after assembling the writing instrument, which not only complicates the process, but also requires driving a pin of appropriate thickness if the lead is thin. However, if the pin is too thin, it must be driven straight, which not only requires advanced technology in the manufacturing process, but also causes the pin to bend during driving, leading to frequent defects.

Furthermore, from a structural point of view, since the pin passes through the center of the core, there is a possibility that the ink circulation may be obstructed.

There is also a type, as in Utility Model Publication No. 41-18327, in which a part of the core holder is bitten into the fiber core to fix it, but in this case as well, after setting the fiber core in the core holder, the fiber core is inserted inward from the end surface of the core holder. A secondary processing step is required, including a step of forming a cut toward the core and a step of bending the cut portion inward, and depending on the bending pressure, the bent portion may dig deep into the core and cause the ink to dry. There was a risk of hindering distribution, and there was a risk of product variations due to the need for careful manufacturing.

This invention does not require any secondary processing such as pinning or bending as described above, and the core is securely fixed just by assembling it as a writing instrument, which simplifies the manufacturing process. The purpose of the present invention is to provide a fixing device that has effects such as less variation in ink output and fixing force.

One embodiment will be described below with reference to the accompanying drawings. Reference numeral 1 denotes a barrel made of metal or synthetic resin, at the tip of which is a resin-cured fiber bundle, a resin sintered body, and a plastic material having an ink flow path inside. A tip hole 2 is opened into which a lead holder 5 made of metal or synthetic resin is fitted, and has a through hole 6 into which an ink guiding lead A having a pen point A, such as a rod-shaped body, is fitted.

A stepped portion 3 is formed inside the tip hole 2, and a through hole 4 is bored in the center through which the rear portion of the ink guide core A passes.

Reference numeral 10 denotes a ring-shaped stopper which plays an important role in the fixing device of the present invention, and is made of synthetic resin or a highly corrosion-resistant metal such as stainless steel, and has an ink guiding core in the center as shown in Figures 3-a and b. A through hole 11 is provided through which A penetrates, and a plurality of small protrusions 12.12 (in the figure, 8 on the outer periphery and 4 on the inner periphery) are bent diagonally downward and deformable on the outer and inner peripheries. ...is formed.

In this state (the protrusion is bent), the relationship between the stopper 10 and the tip hole 2 is expressed in terms of dimensions.If the inner diameter of the tip hole 2 is Dl, the maximum diameter of the stopper 10 including the protrusion is Dl.
The diameter is narrow and small, and the minimum diameter between the protrusions of the through hole 11 is D2.
When the diameter of the ink guide core A is D3, D is smaller than D2.
The relationship is set so that 3 is slightly smaller.

When the stopper 10 is placed on the step 3 in the barrel tip hole 2, it is loaded smoothly due to the above-mentioned dimensional relationship, and in this state, there is a slight gap between the surface of the step 3 and the different surfaces of the stopper due to the protrusion 12. There are gaps.

To explain how to fix the ink guide core in such a configuration, the ink guide core A is adjusted and confirmed in the lead holder 5 so that the protruding length of the pen tip A' from the lead holder 5 is constant. When the lead holder is fitted into the tip hole 2 of the shaft cylinder, the lower end surface 5' of the lead holder 5 presses against the stopper 10 that has been previously loaded into the tip hole.

At this time, the stopper 10 does not move due to the stepped portion 3, and since there is a gap as described above, the stopper 10 deforms in the direction perpendicular to the axial direction due to the pressure, and the protrusion formed on the outer periphery strongly abuts the inner wall of the tip hole 2 (the axial If the tube is made of synthetic resin and the stopper is made of metal, the protrusion may dig into the inner wall of the tip hole.

), the protrusion on the inner circumference strongly presses or slightly bites into the circumferential surface of the ink guide wick A, and at that point the ink guide wick A is firmly fixed.

As described above, since the ink guide core A is loosely fitted into the core holder 5 during assembly, there is no risk of it breaking during installation, and the protruding length of the pen tip can be adjusted at that stage. If the core holder is fitted into the palm of the hand without requiring secondary processing steps such as hammering and bending as in the conventional method, it will be fixed by contacting or biting into the core due to the deformation of the stopper, and the material of the thrust guiding core, If you set the dimensions of the stopper 10, the tip hole of the barrel, and the size of the part of the lead holder that fits into the tip hole in advance according to the thickness, etc., you can simply assemble it, making it suitable for mass production, and the core will be firmly fixed. It has the advantage that it is possible to obtain a writing instrument of stable quality.

In the above explanation, the tip of the ink guide core is a pen tip, but a guide core B that relays ink from an ink storage body C, such as a ballpoint pen shown in FIG. 5, has been described.
It can also be applied to writing instruments of the type that adopts.

In addition, the stop structure may be made into a C ring shape as shown in Figures 4a and 4b, with a part of the ring surface shaped like a mountain, or if necessary, the stop may be placed between the rear end surface of the lead holder and the step. The structure may be such that the stopper deforms in a direction perpendicular to the axial direction when compressed, and as a result of the deformation, strongly abuts the ink guide core or bites into it slightly.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which Fig. 1 is a vertical sectional view of the main part of the writing instrument showing the state in the middle of assembly, Fig. 2 is a longitudinal sectional view of the main part of the writing instrument showing the state after assembly, and Fig. 3- Fig. 3-a is an enlarged plan view of the stopper, Fig. 3-b is a vertical sectional view taken along the line X-X in Fig. 3-a, and Fig. 4-a is another embodiment corresponding to Fig. 3-a. FIG. 3b shows another embodiment corresponding to FIG. 3b, and FIG. 5 shows another embodiment corresponding to FIG. 2. 1 is the barrel, 2 is the tip hole, 3 is the step, 5 is the core holder, 1
0 is a ring-shaped stopper, and A and B are ink guide cores.

Claims (1)

[Scope of utility model registration request] A ring-shaped stopper having a gap between the stepped portion and the stepped portion that can be deformed in a direction perpendicular to the axial direction is placed on the stepped portion in the tip hole of the shaft cylinder;
When the core holder fitted with the ink guide core is fitted into the tip hole, and the lower end surface of the holder presses the stopper against the stepped part, the outer and inner circumferences of the stopper will be perpendicular to the axial direction due to deformation of the stopper. An ink guide core fixing device for a writing instrument, which spreads in the direction and fixes the ink guide core by strongly contacting or biting into the inner wall of the tip hole and the periphery of the ink guide core.