JP3179157B2 - Ballpoint pen - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ball-point pen using a tip fixing joint.

[0002]

2. Description of the Related Art A ballpoint pen guides ink from an ink storage tube to a ball at the tip of a tip to enable writing. However, the writing pressure received by the tip during writing is considerable. May be loose and hinder writing. FIG. 4 is a sectional view of a conventional ballpoint pen. This ball-point pen has a core 15 to which the tip 7 and the ink storage tube 9 are directly connected. A band-shaped stopper 14 is wound around the ink storage tube 9 and fixed. , The tip 7 is covered with the tip cover 16, the rear end of the tip cover 16 is fitted to the shaft 17, and the cap 11 for protecting the chip 7 is detachably attached to the shaft 17. It was done. This ball-point pen prevents the tip 7 from swaying by engaging the stopper 14 with the end face of the shaft 17 to cope with the writing pressure, and forming the tip 7 and the tip through hole of the tip cover 16 into a fitting structure. It is something to do.

[0003]

The core of the above-mentioned ball-point pen has a structure in which a band-shaped stopper is wound around the ink storage tube, crushed and fixed. Therefore, since the writing pressure is received by the stopper, it is necessary to securely fix the stopper to the ink storage tube in order to prevent the center core from moving in the axial direction. However, if the force of the squeeze of the stopper is too strong, the ink storage tube may be deformed and the flow of ink may be hindered. May cause trouble, and the function of the stopper cannot be performed. Therefore, the fixing of the fastener requires a more advanced technique than expected.

If the position where the stopper is provided is shifted toward the tip of the center, the tip is shorter than the tip cover and writing becomes difficult, and if the tip is far from the tip, there is a gap between the shaft and the tip cover. And the appearance becomes clumsy. Therefore, it is necessary to strictly control the size of the position where the stopper is provided, and it is necessary to completely inspect the appearance of the assembled product.

Further, in order to prevent the tip from swaying during writing, a structure is employed in which the tip and the tip through hole of the tip cover are fitted. In order to ensure an accurate fitting structure, it is necessary to manufacture the tip cover. In this case, it is necessary to strictly control the size of the chip through-hole. Particularly, when the tip cover is made of a relatively soft material, the chip through-hole may expand over a long period of use, and the roll prevention function may be reduced.

Accordingly, the present invention has solved the above-mentioned disadvantages,
By connecting the tip and the ink storage tube with a joint having the function of a stopper, the tip does not move in the axial and radial directions even when written for a long time, and the tip does not rattle. An object of the present invention is to provide a ballpoint pen that can provide a good writing feeling.

[0007]

According to the present invention, there is provided a chip 7 having a ball at the tip, an ink container 9 for connecting the chip 7 through a joint 1, a shaft 12 for accommodating the ink container 9, 7 has a front end cover 10 that protrudes and covers the front of the front end 7 by a predetermined length, and has a fitting or screwing structure for fixing the chip 7 by connecting the rear end of the front end cover 10 to the front end of the shaft 12. In the ball-point pen, the joint 1 has a flange 4 in the middle which abuts against the end face of the shaft 12 , a joint front 2 connected to the tip 7, a joint rear 5 connected to the ink storage tube 9, and a joint front 2 Around the perimeter
Comprising a joint cylinder portion 3 extending forwardly from the flange portion 4 is provided a gap, the joint cylinder portion 3 provided Setsukomimizo 6 over 1 places in the axial direction to impart elasticity, and, the joint cylinder portion 3 The outer diameter of the front portion is made slightly larger than the inner diameter of the tip cover 10 so that the tip cover 10 can press the front of the joint cylindrical portion 3 inward when the tip cover 10 is fitted or screwed to the shaft 12. And a tip penetrating hole formed between the joint front part 2 and the inner wall of the tip cover 10 and / or the tip 7 and the tip cover 10 of the tip cover 10 as required to more reliably prevent the tip from swaying. It is also possible.

[0008]

DETAILED DESCRIPTION OF THE INVENTION The present invention employs a distearate <br/> Yointo connecting the chip and the ink reservoir is provided with a flange portion having a function of end stop in the middle of the joint, abutting the flange portion in the axial end face By receiving the pen pressure applied to the tip on the shaft, the tip is prevented from moving in the axial direction, and at least one notch is provided in the joint cylinder extending in the forward direction from the flange to provide elasticity. The outer diameter of the front portion of the joint cylindrical portion is made slightly larger than the inner diameter of the distal end cover, and when the distal end cover is fitted or screwed on the shaft, the front end of the joint cylindrical portion is pressed inward by the distal end cover. This is a ballpoint pen that prevents the chip from rolling. Therefore, even when the chip is used for a long period of time, there is no axial displacement or lateral sway of the chip, and it is possible to maintain an extremely good writing feeling.

Further, the above-mentioned joint has a simple shape, and for example, a thermoplastic resin such as polyacetal, polypropylene and polyethylene can be easily produced by an injection molding method, and a metal material such as brass is machined. It is also possible to manufacture with. These manufacturing methods do not require advanced technology such as conventional fastening of fasteners in the core, strict dimensional control, and do not require 100% inspection of the appearance of the assembled product. Can be greatly reduced.

[0010]

FIG. 1 is a sectional view of an entire ball-point pen according to an embodiment of the present invention, and FIG. 2 is an enlarged view for explaining a state in which a tip and an ink storage tube are connected by a joint. FIG. 3 is a view taken in the direction of arrows AA ′ in FIG. A step is provided at the rear part of the chip 7, the rear part of the chip 7 is press-fitted and fixed to the joint front part 2 of the joint 1 up to the step, and the rear part 5 of the joint is press-fitted and fixed in the ink storage pipe 9 to join the end face of the ink storage pipe 9 to the joint. The core 8 is formed by abutting the flange 4 of the joint 1, and the ballpoint pen is assembled by inserting the ink storage tube 9 of the core 8 into the shaft 12 and attaching the flange 4 of the joint 1 to the end face of the shaft 12. And the pen pressure received by the tip 7 is transmitted to the shaft 12 to prevent the tip 7 from moving in the axial direction. Next, the tip cover 10 is put on the chip 7 and screwed to the tip of the shaft 12. The distal end cover 10 has a through hole through which the chip 7 passes, and the diameter of the inner wall of the distal end cover is equal to the flange 4 of the joint 1.
The outer diameter of the joint cylindrical portion 3 extending further forward is slightly smaller than that of the joint cylindrical portion 3, and the joint cylindrical portion 3 is inwardly mounted by mounting the tip cover 10 against the elasticity provided by the cut groove 6 of the joint cylindrical portion 3. Pressing prevents the joint 1 from swaying in the radial direction. Further, when the joint front portion 2 and the inner wall of the distal end cover 10 and the chip 7 and the chip through hole of the distal end cover 10 have a fitting structure, the joint 1 is aligned with the joint cylindrical portion 3 of the joint 1 at an axially separated position. The chip can be supported, and the chip can be more reliably prevented from rolling. A tail plug 13 is attached to the rear end of the shaft 12, and the tip 7 is protected by the cap 11.

[0011]

According to the present invention, the tip and the ink storage tube are connected by the joint having the above-mentioned structure, and the tip of the joint is brought into contact with the shaft end face so that the pen pressure received by the tip is transmitted to the shaft with certainty. By preventing the axial movement of the joint, and providing a cut groove in the joint cylindrical portion extending forward from the flange portion to impart elasticity, and pressing the joint cylindrical portion inward with the tip cover, the joint cylindrical portion Radial shaking can be prevented, and a ballpoint pen with extremely good writing feel can be provided. Further, since the joint of the present invention has a simple structure and does not require strict dimensional accuracy, it has become possible to greatly reduce the manufacturing cost as compared with a conventional core using a fastener.

[Brief description of the drawings]

FIG. 1 is a sectional view of an entire ballpoint pen according to an embodiment of the present invention.

FIG. 2 is an enlarged view centering on the joint of FIG. 1;

FIG. 3 is a view taken in the direction of arrows A-A 'in FIG. 2;

FIG. 4 is a sectional view of a conventional ballpoint pen using a stopper.

Claims (2)

(57) [Claims] 1. A chip 7 having a ball at its tip and an ink container 9 connecting the chip 7 via a joint 1.
A shaft 12 for accommodating the ink storage tube 9 and a tip cover 10 for projecting and covering the front of the chip 7 by a predetermined length, and connecting the rear end of the tip cover 10 to the tip of the shaft 12; In a ball-point pen provided with a fitting or screwing structure for fixing the chip 7, the joint 1 has a collar portion 4 which is in contact with the end face of the shaft 12 , a joint front portion 2 which is connected to the chip 7, and an ink storage tube. Joint rear 5 connecting with 9
When, with the joint cylinder portion 3 extending forward from the flange portion 4 is provided a gap on the outer periphery of the joint front 2, the elastic joint cylindrical portion 3 provided Setsukomimizo 6 over 1 places in the axial direction grant In addition, the outer diameter of the front part of the joint cylindrical part 3 is made slightly larger than the inner diameter of
A ball-point pen characterized in that the front end of the joint cover (3) can be pressed inward by the front cover (10) when the shaft (0) is fitted or screwed on the shaft (12). 2. The ball-point pen according to claim 1, wherein the joint front portion 2 and the inner wall of the tip cover 10 and / or the tip 7 and the tip through-hole of the tip cover 10 have a fitting structure.