JPS6323178Y2 - - Google Patents

Description

[Detailed description of the invention] The purpose of this invention is to improve a nib knock-type writing instrument in which the valve of the ink storage chamber is opened by knocking the pen nib, allowing ink to flow out into the nib. However, by using an integrally formed shaft cylinder, the external design is renewed, ink leakage is prevented, assembly is improved, and the product can be manufactured at low cost.

In conventional pen nib type writing instruments, the front and rear shafts are connected by screwing or caulking, and the valve mechanism is clamped and locked. It had the disadvantage that force applied to it could cause it to loosen or fall out, causing ink to leak. For this reason, it may be possible to apply an adhesive to the joint to firmly fix the joint, but in this case there were problems such as the adhesive spilling out from the joint and staining the shaft cylinder.

This invention has a pen tip holder with a through hole formed in the middle part and a step part, the pen tip inserted into the center hole, and a valve mechanism attached to the large diameter part at the rear end. It is inserted through the rear end opening of an integrally molded barrel with a stepped part formed on the inner surface of the intermediate part, the hook part is locked to the stepped part of the nib holder, and the hook part is inserted into the stepped part of the barrel. It is characterized by locking the bottom of the large diameter part of the nib holder, injecting ink into the barrel, and tightly fitting the tail plug into the opening at the rear end of the barrel. The purpose of this invention is to eliminate the drawback of the conventional method, which prevents the attachment part from detaching due to backward compressive force caused by knocking force of the pen tip, etc., even when a pen tip holder, etc.) is inserted and attached to the front.

1 to 3 show a first embodiment of the present invention. 1 is a pen nib holder having a stepped part 1a with a small diameter in the middle part, and a through hole 1b formed in the middle part;
Insert the pen tip 2 into the center hole 1c, and press the rear end large diameter part 1d.
The valve housing 3 is fitted and fixed into the circular hole 1e, and the valve 5 is pressed against the valve seat 1f at the bottom of the circular hole 1e by an internal spring 4. Reference numeral 6 denotes a shaft cylinder having a narrow diameter portion 6a at the tip, and integrally formed with a hook portion 6b having elasticity in the radial direction and facing inward on the inner surface of the tip.

When assembling, a porous material 7 such as felt or sponge is wound around the outer periphery of the through hole 1b of the nib holder 1, and it is inserted into the rear end opening of the barrel 6. The outer diameter of the barrel of the nib holder 1 is the same as the inner diameter of the small diameter section 6a of the barrel 6, so when the barrel passes through the hook section 6b, the hook section 6b is pushed outward and elastically displaced, and when the nib holder 1 is fully inserted, the bottom of the large diameter section 1d engages with the step section 6c in the middle of the barrel 6, and at the same time, the hook section 6b engages with the step section 1a by its own elasticity. Furthermore, the cone ring 3a of the valve housing 3 goes over the protrusion 6d on the inner surface of the barrel 6 and is snapped into engagement. Next, raw ink 8 is poured into the rear end opening of the barrel 6, and a plug 9 is tightly fitted into the rear end opening.

When in use, when the tip of the pen nib 2 is tapped, the valve 5 is pushed against the elasticity of the spring 4 and the valve seat 1f is opened, so that raw ink flows into the nib 2. Excess raw ink is stored in the porous body 7 through the through holes 1b.

Figures 4 to 6 show the second embodiment of the present invention and the first embodiment.
A stepped portion 6e is formed on the inner surface of the tip of the barrel 6 of the embodiment, and a hook portion 1g that can be elastically displaced in the radial direction is formed on the outer periphery of the tip of the pen nib holder 1, and the pen nib holder 1 is attached to the barrel as in the first embodiment. 6 When inserted from the rear end opening, the bottom of the large diameter portion 1d of the nib holder 1 engages with the intermediate step 6c of the barrel 6, and the hook portion 6b engages with the step 1a, as in the first embodiment. The conical ring 3a is the protrusion 6d.
At the same time as the hook portion 1g is engaged with the step 6e, the hook portion 1g is engaged with the step 6e.

The operation is exactly the same as in the first embodiment.

According to the present invention, a through hole is formed in the middle part and a stepped part is provided, the pen nib is fitted into the center hole, and a pen nib holder with a valve mechanism attached to the large diameter part of the rear end is placed radially on the inner surface of the tip part. The barrel is inserted through the rear end opening of an integrally molded barrel having an elastic hook and a step formed on the inner surface of the intermediate part, and the hook is locked to the step of the nib holder. The bottom of the large diameter part of the pen nib holder is locked, ink is injected into the barrel, and the tail plug is tightly fitted into the opening at the rear end of the barrel, so it is pushed backwards by the knock pressure etc. from the pen tip. There is no need to return the cylinder, and the barrel can be molded in one piece without having to be separated, allowing for a new exterior design and preventing ink leakage.
It is easy to assemble and can be manufactured at low cost.

Note that an arbitrary number of vertical grooves may be formed instead of having a small diameter in the intermediate portion.

[Brief explanation of the drawing]

Figure 1 is a front sectional view of the first embodiment of the present invention, Figure 2 is a front view of the pen nib holder in Figure 1, and Figure 3 is a front view of the pen nib holder in Figure 1.
4 is a front sectional view of the second embodiment of the present invention, FIG. 5 is a front view of the pen nib holder in FIG. 4, and FIG. FIG. 1...Pen tip holder, 1a...Stepped portion, 1b...
...Through hole, 1c...Center hole, 1d...Large diameter part, 1e
...Round hole, 1f...Valve seat, 1g...Hook part, 2
...Pen tip, 3...Valve housing, 4...Spring, 5...
Valve, 6... barrel, 6b... hook part, 8... raw ink, 9... stopper.

Claims (1)

[Scope of utility model registration request] A pen nib holder with a through hole formed in the middle part and a stepped part, a pen nib inserted into the center hole, and a valve mechanism attached to the large diameter part of the rear end, which has elasticity in the radial direction on the inner surface of the rear end. The pen tip is inserted into the rear end opening of the integrally molded barrel which has a hook part and a stepped part formed on the inner surface of the middle part, the hook part is locked to the stepped part of the nib holder, and the pen tip is inserted into the stepped part of the barrel. A nib-knob type writing instrument in which the bottom of the large diameter part of the holder is locked, ink is injected into the barrel, and a tail plug is tightly fitted into the opening at the rear end of the barrel.