JPH0545510Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial field of application) The present invention relates to a refill-replaceable writing instrument of a type in which the pen nib can be replaced with another one as soon as the ink stored inside is used up.
In particular, the present invention relates to a refillable writing instrument that can be produced easily at low cost and has significantly improved durability over time.

(Prior art and its problems) Conventionally, in writing instruments, a refill containing ink and having a pen tip at the tip is placed in a barrel, and when the ink is consumed, it is replaced with another refill. There is a type. Reliability is required when fixing such a refill in the barrel, and for this reason, a spring is normally placed inside the rear end of the barrel, and the rear end of the refill is brought into contact with this spring to prevent the refill from being fixed. The main method used is to force the wheel forward and prevent it from rattling. However, this device has problems in the assembly process, such as the installation of the spring being troublesome and the need for a cumbersome adhesion process to prevent the spring from falling off.

In recent years, as shown in Japanese Utility Model Application Publication No. 60-132372, there has been known an attempt to solve the above problem by providing an elastic protrusion integrally with the barrel inside the rear end of the barrel. However, if we take into account that refillable writing instruments are intended to be used semi-permanently, plastic deformation of the protrusions that occurs over time is undeniable, and this reduces the durability. This results in the inconvenience that it becomes difficult to guarantee that the intended purpose cannot be achieved.

(Means for solving the problem) This invention was devised in view of the above situation, and basically uses a separate member as a substitute for the spring, but eliminates problems in the assembly process as much as possible. To provide an excellent refillable writing instrument that does not deteriorate its durability.

That is, the present invention provides a refill-replaceable writing instrument in which a refill for storing ink is disposed inside the barrel of the writing instrument, and an elastic body is disposed at the rear end of the barrel to urge the refill forward. The gist of the invention is a refillable writing instrument characterized in that the elastic body is a rubber-like elastic ball, and the rubber-like elastic ball and the inner wall of the barrel are in contact with each other.

(Function) In this invention, a rubber-like elastic ball is used instead of a conventional spring or a protrusion provided integrally with the shaft cylinder, so when it is installed in the shaft cylinder, because it is a sphere, there is no direction. The work is extremely efficient due to the fact that there is no elasticity, and the material properties and shape characteristics, and furthermore, by bringing the rubber-like elastic ball into contact with the inner wall of the shaft cylinder, the external force applied to the rubber-like elastic ball can be reduced. In addition to the rear end of the writing instrument, it is also distributed toward the side wall,
This can also contribute to improved durability over time, and as a result, an excellent refill-replaceable writing instrument that can reliably hold the refill can be obtained.

(Example) Hereinafter, the present invention will be explained in detail based on examples.

In FIG. 1, reference numeral 10 is a barrel of a writing instrument made of metal, resin, etc. The inside of the rear end of this barrel 10 is made of silicone rubber, NBR, SBR, NR, etc.
A rubber-like elastic ball 11 made of fluorine-based rubber or the like is attached, and the rear end of the refill 12, which is arranged inside the shaft cylinder 10 and accommodates ink, comes into contact with this rubber-like elastic ball 11, and the refill 12 moves forward. It's been repelled.

FIG. 2 shows another embodiment of the present invention.
0 is a barrel, 21 is a rubber-like elastic ball, and 22 is a refill. The difference from the above embodiment is that the shaft cylinder 2
The tail crown 23 is fixed to the rear end of the 0.

In this invention, when actually installing the rubber-like elastic ball into the barrel, push the rubber-like elastic ball from the opening side of the barrel, and then use the refill to push it all the way to the innermost part of the barrel. All you have to do is push it in, and the work can be done easily like this. Therefore, in consideration of workability, it is preferable that the inside of the barrel has a tapered shape that gradually decreases in diameter toward the rear, and the inner diameter of the innermost part is equal to the outer diameter of the rubber-like elastic ball. It is particularly preferable to set it so that it is approximately equal to the diameter from the viewpoint of preventing the elastic ball from falling off.

(Effects) As described above, the present invention is a barrel for a writing instrument in which a refill for accommodating ink is disposed inside, a rubber-like elastic ball is attached to the inside of the rear end of the barrel, and the rubber-like elastic ball Since the refill is made to repel by the refill, the desired writing instrument can be obtained easily at a low cost, and its durability is also good.It is an excellent refill exchange that can be expected to hold the refill reliably without rattling. A type writing instrument is obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and are shown in FIG.
FIG. 2 is a longitudinal cross-sectional view of a main part of each refillable writing instrument. 10, 20... shaft cylinder, 11, 21... rubber-like elastic ball, 12, 22... refill.

Claims (1)

[Scope of utility model registration request] A refill-replaceable writing instrument in which a refill for storing ink is disposed inside the barrel of the writing instrument, and an elastic body is disposed at the rear end of the barrel to bias the refill forward, wherein the elastic body is rubber-like. A refillable writing instrument characterized in that it is an elastic ball, and the rubber-like elastic ball and the inner wall of the barrel are in contact with each other.