JP2539273Y2 - Writing implement - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a writing instrument in which a pen core is not directly attached to a shaft but is attached to a shaft via a pen core holder.

[0002]

2. Description of the Related Art Conventionally, as a writing instrument of this type, as shown in FIG. 2, the tip of a metal pen core holder 7 is swaged inward and cut into the outer surface of the pen core 8 to thereby penetrate the pen core 8.
There is known a structure in which a pen core holder 7 is fixed and the pen core holder 7 is press-fitted to a shaft and attached. However, in such a structure, since the pen core holder 7 bites into the pen core 8, the ink flow path of the pen core 8 is crushed, and the outflow of ink is hindered. Therefore, if the pen nib holding member 7 bites into the pen nib 8 in a small amount in order to eliminate such adverse effects, the pen nib 8 is insufficiently fixed, so that the pen nib 8 is immersed in writing or has a looseness in the radial direction. Problem.

[0003]

According to the present invention, the fixing of the pen core is ensured, and there is no problem of immersion or radial backlash during writing, and the ink flow path of the pen core is crushed. To provide a writing implement that does not have any adverse effects such that ink leakage is hindered.

[0004]

In order to achieve the above object, a writing instrument according to the present invention has a pen core 2 having a locking groove 1 formed on the outer surface in a circumferential shape and a pen core 2 fitted into the locking groove 1 on the inner surface. And a pen core holder 5 having a locking projection 3 whose front surface is in contact with the front wall of the locking groove 1 and a narrow inner diameter portion 4 for contacting the inner edge of the pen core 2 with the outer peripheral surface thereof. The pen core 2 is attached to the shaft 6 via the pen core holder 5.

[0005]

When writing, the front wall of the locking groove 1 provided in the pen core 2 comes into contact with the front surface of the locking projection 3 provided in the pen core holder 5 so that the pen holder is prevented from sinking. Since the inner edge of the narrow inner diameter portion 4 provided on the outer surface contacts the outer peripheral surface of the pen core 2,
The rattling of the pen core 2 in the radial direction is also prevented.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment will be described below in detail with reference to FIG. This embodiment shows a felt-tip pen. First, a rod-shaped pen core 2 made of a fiber bundle has a circumferentially provided locking groove 1 on an outer surface near a front end and a sharpened portion 14 at a rear end.
Next, the pen core holder 5 is made of resin and has a substantially cylindrical shape, and has a thin portion 9 at the front end.
And the narrow inner diameter portion 4 is provided on two inner surfaces at the front and rear ends of the thick portion 10 following the thin portion 8. The diameter of the inscribed circle in the locking projection 3 of the pen core holder 5 is slightly larger than the outer diameter of the locking groove 1 of the pen core 2 and somewhat larger than the outer diameter of the portion before and after the locking groove 1. The inner diameter of the small inner diameter portion 4 is set to be slightly smaller than the outer diameter of the pen core 2 at the rear portion of the locking groove 1. The pen core holder 5 has the pen core 2 inserted therein, the locking protrusion 3 is fitted into the locking groove 1, the front surface of which is brought into contact with the front wall of the locking groove 1, and the narrow inner diameter is reduced. The inner edge of the portion 4 is pressed against the outer peripheral surface of the pen core 2 to be integrated with the pen core 2. On the other hand, the shaft 6 has a front end opened and a rib 12 having a step portion 11 protruding at a plurality of circumferential locations on the inner surface thereof, and an ink storage member 13 made of a fiber bundle is provided behind the rib 12.
Is stored. The pen core holder 5 is pressed into the shaft 6 from the front end opening in a state integrated with the pen core 2 so that the rear end of the pen core holder 5 contacts the step 11 of the rib 12, and the pen core 2 is at the rear end. The sharp portion 14 is inserted into and connected to the ink occluding body 12 from its front end face.

[0007]

The present invention is as described above. Since the locking projection 3 of the pen core holder 5 is fitted into the locking groove 1 provided in the pen core 2, the pen core 2 is prevented from being immersed. Since the inner edge of the narrow inner diameter portion 4 provided on the core holder 5 is brought into contact with the outer peripheral surface of the pen core 2, the rattling of the pen core 2 in the radial direction is also prevented, and the pen core 2 is securely fixed. There is. Further, since the pen core holder 5 does not crush the ink flow path of the pen core 2, there is an effect that it is possible to solve a problem that ink outflow is hindered.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a conventional pen core holder attached to a pen core.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Locking groove 2 Pen core 3 Locking projection 4 Narrow inner diameter part 5 Pen core holder 6 Shaft 7 Pen core holder 8 Pen core 9 Thin part 10 Thick part 11 Step part 12 Rib 13 Ink occluding body 14 Sharp part

Claims (1)

(57) [Scope of request for utility model registration] 1. A pen core 2 having a circumferentially formed locking groove 1 on an outer surface, and a locking projection fitted into the locking groove 1 on an inner surface and a front surface of which is in contact with a front wall of the locking groove 1. 3 and a pen core holder 5 provided with a small inner diameter portion 4 for bringing the inner edge portion into contact with the outer peripheral surface of the pen core 2, and the pen core 2 is attached to the shaft 6 via the pen core holder 5. A writing implement characterized by the following.