JPS625351Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the structure of a core fixing part in a writing instrument, particularly in its refill.

Conventionally, in writing instruments of the type in which the rear end of the core is brought into contact with an ink-absorbing body such as batting and the writing end of the core is protruded from the barrel, the core is held by a core holder, and the core is held by a core holder. A structure in which the core holder body is covered with a core holder fixing pipe and fixed to the tip opening of the shaft cylinder is generally adopted. Additionally, a spacer is generally provided near the tip end inside the barrel to activate air replacement, with which the tip surface of the ink storage body abuts. In the past, this spacer was typically formed separately or integrally with the barrel. As described above, the structure of the lead fixing part of a writing instrument is complicated, so it is necessary to separately attach a spacer and fix the lead holder fixing pipe, and the assembly thereof is extremely complicated.

The object of the present invention is to eliminate such drawbacks and to provide a writing instrument in which the parts of the lead fixing part can be easily assembled, and the parts can be more firmly fixed.

This invention further covers the core holder that holds the core, and integrates it into the rear end of the core holder fixing pipe, which is fixed to the tip opening of the barrel, and has a diameter larger than the inner diameter of the small diameter part at the tip of the barrel. A spacer is formed, and a protrusion is provided on the outer surface of the shaft in front of the spacer with a diameter slightly larger than the inner diameter of the small diameter portion at the tip of the barrel, allowing the small diameter portion to pass through while being elastically deformed from the inside of the barrel toward the outside. A core holder fixing pipe with a large diameter spacer formed at the rear end is inserted through the rear end opening of the barrel, and a protrusion provided on the outer surface of the shaft in front of it elastically deforms the small diameter portion at the tip of the barrel. By press-fitting the spacer until it passes, the jaws of the spacer are brought into contact with the inner step of the barrel, and the protrusion is restored after passing through the small diameter part of the tip of the barrel, and is engaged with the edge of the tip of the barrel. Assembling the spacer and core holder fixing pipe is completed in one step,
Moreover, the spacer and the protrusion are fixed firmly by hooking them onto the shaft cylinder.

The drawings show an embodiment of the present invention, in which Fig. 1 is a longitudinal sectional view of the tip of the writing instrument, Fig. 2 is a transverse sectional view taken along the line A-A in Fig. 2 is an ink absorbing body such as batting, 3 is a core made of fiber or plastic, 4 is a core holder made of metal or plastic, and 5 is an air hole, and the core holder has the core 3 fixed thereto. A spacer 8 having an outer diameter larger than the inner diameter of the small diameter portion 7 at the tip end of the shaft tube 1 is integrally formed at the rear end of the core holder fixing pipe 6 that further covers the core holder fixing pipe 6 so as to protrude in four directions around the outer circumference. At the same time, a small protrusion 9 is formed on the outer surface of the front shaft. The core holder fixing pipe 6 is made of plastic and has elasticity, and when the small protrusion 9 is press-fitted to pass through the small diameter portion 7 at the tip of the barrel 1, it is slightly deformed, and after passing, the small diameter portion 7 at the tip of the barrel 1 is deformed. Restored so that it can be engaged with the edge of the tip.

As described above, in the present invention, since the spacer is formed integrally with the core holder fixing pipe, the trouble of forming the spacer separately is eliminated, and it is easier than forming the spacer integrally inside the shaft cylinder. Furthermore, since the assembly is done integrally when the core holder fixing pipe is attached, efficiency is high. In addition, in the conventional example, the core holder fixing pipe was simply press-fitted, and there was a risk that it would come out forward, but the spacer plays the role of preventing it from coming out, and the spacer also absorbs ink by engaging the protrusion. This has the effect of preventing the body from moving in a direction that puts pressure on it.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the tip of a refill in a writing instrument showing an embodiment of the present invention, and Fig. 2 is a longitudinal cross-sectional view of the tip of the reel in a writing instrument showing an embodiment of the present invention.
- It is a cross-sectional view in the A line. DESCRIPTION OF SYMBOLS 1... Shaft tube, 2... Ink storage body, 3... Core body, 4... Core holder, 5... Air hole, 6... Core holder fixing pipe, 7... Small diameter portion at the tip of the stem tube. , 8...
...Spacer, 9...Small protrusion.

Claims (1)

[Scope of utility model registration request] A spacer having a diameter larger than the inner diameter of the small diameter portion at the tip of the barrel is integrally attached to the rear end of the core holder fixing pipe that further covers the core holder that holds the core and is fixed to the tip opening of the barrel. A writing instrument comprising a projection having a diameter slightly larger than the inner diameter of the small diameter portion at the tip of the barrel and allowing the small diameter portion to pass through the barrel while being elastically deformed from the inside to the outside of the barrel. .