JP3926421B2 - Writing instrument - Google Patents

Description

[0001]
[Industrial application fields]
The present invention has an ink tank that directly stores ink without occluding the padding or the like, and when the air in the ink tank expands due to a temperature rise or the like, the ink pushed out of the ink tank is transferred from the brush tip or the air hole. The present invention relates to an improvement of a writing instrument cap provided with an ink reservoir for temporarily retaining the ink so as not to drop.
[0002]
[Prior art]
The conventional ink direct storage type writing instrument cap has a seal cylinder that can be moved in the axial direction so that the volume in the seal cylinder does not change when the cap is detached, and the opening edge of the seal cylinder is the cone of the mouthpiece of the writing instrument cylinder. The surface is brought into contact with an appropriate pressing force and sealed.
[0003]
In addition, the so-called batting method of the writing instrument cap is attached to the shaft tube to seal the nib and air hole, but when the cap is attached to the shaft tube to ensure the seal, the shaft is immediately before the completion of the application. The inner space of the cap is reduced while the seal portion of the cylinder and the cap is closely fitted and the deposition is completed. For this reason, when the cap is attached, the inside of the cap is pressurized. On the other hand, when the cap is detached, the space inside the cap is decompressed while the tight fitting portion of the seal portion is released, so the pressure is reduced. However, the batting type writing instrument has a continuous space inside the cap and the latter half of the shaft cylinder containing the batting through the air hole of the shaft cylinder, so the whole is pressurized and depressurized, and the ink reservoir and pen tip The pressure does not change, and the action of ink flowing out from the nib or air hole does not work when the cap is attached or detached. However, in the direct storage type writing instrument, the volume of the seal cylinder is not changed when the cap is attached / detached. The air inside is compressed and the air hole passes through the ink reservoir to enter the ink tank as bubbles, and the ink overflows accordingly and is retained in the ink reservoir. On the contrary, when the cap is removed from the shaft cylinder, the air in the seal cylinder is depressurized contrary to the above phenomenon, so that the ink in the ink tank is drawn out and is also retained in the ink reservoir. Ink is drawn from the pen tip. In this way, each time the cap is attached / detached, the ink storage amount of the ink storage body increases, and eventually the storage capacity is exceeded and ink flows out from the air holes or ink leaks out from the pen tip. To do. In order to prevent this phenomenon, conventional ink direct storage type writing instrument caps employ the following structure.
[0004]
[Problems to be solved by the invention]
The conventional direct storage type writing instrument cap has an opening edge that allows the seal cylinder to be moved in the axial direction so that the inside of the relatively hard seal cylinder made of polypropylene or polyethylene is not pressurized and depressurized and sealed when the cap is detached. Since the structure is in close contact with the conical surface of the mouthpiece of the writing instrument shaft cylinder, the structure becomes complicated and the number of parts increases, resulting in an increase in product unit cost and an increase in assembly cost due to the complexity of assembly. An object of the present invention is to make it possible to provide a cap that solves such adverse effects.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the writing instrument of the present invention has a tank for directly storing ink at the rear of the shaft cylinder, and a writing instrument of an ink direct storage system having an ink reservoir at the front of the shaft cylinder. A flange with a cup-shaped rear end and a sealing cylinder made of resin or rubber rich in elasticity is attached to the locking step provided in the cap by abutting and locking the flange, while the tip A base is provided at the rear of the conical surface of the tip of the ink storage body provided with a chip, an air groove is provided between the inner and outer surfaces of the base and the ink storage body, and an opening communicating with the air groove Is provided from the end of the base to the front conical surface, and when the cap is attached to the front of the shaft tube, the inner opening edge of the seal tube is fitted from the middle of the opening of the conical surface, and the attachment of the cap is completed. When the flange end of the seal tube comes into contact with the end of the base , Characterized in that so as to seal the opening and nib air groove. When the opening end of the base comes into contact with the seal cylinder, the end face of the seal cylinder is compressed and the space in the seal cylinder is pressurized, but the cap is compressed so that the compression amount of the seal cylinder can be made small. By regulating the position where the shaft cylinder is stopped, pressurization of the space in the seal cylinder can be prevented from becoming a problem in practical use.
[0006]
【Example】
FIG. 1 shows an embodiment of the present invention, which will be described in detail with reference to the drawings. The writing instrument body is provided with an ink reservoir 2 having a rear portion of the shaft cylinder 1 and an ink chamber 2 in the front, and a large number of circumferential grooves 3 and longitudinal grooves 4 communicating the circumferential grooves 3 on the outer peripheral surface. An ink guide core 7 is inserted into a longitudinal hole 6 that penetrates the central portion of the reservoir 5 in the axial direction, and the tip of the ink guide core 7 abuts or sticks to the center core 8. Ink is supplied to the pen tip 9 from the ink chamber 2 through the ink guide core 7 and over the center core 8.
[0007]
Next, the cap 13 is provided with an engaging projection 14 for engaging with the convex portion 15 of the shaft cylinder 1 on the inner surface near the opening edge, and is engaged with the convex portion 15 of the shaft cylinder 1 and provided on the inner wall of the cap 13. The abutting step portions 17 of the plurality of ribs 16 abut against the flange portion 11 of the base 10 that is closely fitted to the shaft tube 1 and are attached to the shaft tube 1 at a fixed position. Further, a locking step portion 18 is formed on the rib 16 of the cap 13, and a flange portion 20 of a seal cylinder 19 made of cup-shaped rubber is applied to the locking step portion 18 and is fitted to the rib 16 to fit inside the cap 13. Locked in place. Here, when the cap 13 is attached, the inner opening edge 22 of the seal cylinder 19 is fitted from the middle of the opening 24 of the air groove 12 of the conical surface 23 of the ink reservoir 5, and the opening of the seal cylinder 19 is radiused. The seal tube 19 is applied while being spread out in the direction. Even if the shaft center of the seal tube 19 and the shaft center of the shaft tube 1, that is, the shaft center of the base 10 are shifted, the seal tube 19 is completely covered when the cap is completely attached. The opening is deformed so that the end surface 21 of the seal cylinder 19 and the end 25 of the base 10 are in close contact with each other over the entire circumference, and the inner opening edge 22 of the seal cylinder 19 is the cone of the ink reservoir 5. The seal tube is fitted from the middle of the opening 24 of the air groove 12 of the surface 23 so that the inside of the seal tube 19 can be vented to the outside air through the opening 24 of the air groove 12 until the cap is completely attached. 19 is pressurized from the tip of the nib 9 Gas is to avoid imparting a disadvantage to inhibit writing the outflow of the inlet and the ink. When the flange 11 of the base 10 comes into contact with the contact step 17 of the cap 13 and the cap is completely attached, the end 25 of the base 10 is 0.05 to 0.5 mm on the end surface 21 of the seal cylinder 19. The end portion 25 of the insertion base 10 and the end surface 21 of the seal cylinder are in close contact with each other, and the air groove 12 and the nib 9 are sealed.
[0008]
[Action]
In the writing instrument configured as described above, when the cap 13 is attached to the writing instrument body, the tip including the pen tip 9 and the air hole 12 enters the seal cylinder 19, and the end surface 21 of the seal cylinder 19 is the end of the base 10. First, the micro-shaft cylinder 1 enters the cap 13 and then the flange portion 11 of the cap 10 comes into contact with the contact step 17 of the cap 13 and stops. At the same time, the convex portion 15 of the shaft cylinder 1 maintaining the deposition state of the engagement projection 14 is engaged Jikuto 1 and the cap 13, the end portion 25 of the base 10 on the end face 21 of the seal tube 19 is slightly enters adhesion to seal the air grooves 12 and the pen point 9 . Here, when the end portion 25 of the base 10 abuts and comes into close contact with the end surface 21 of the seal cylinder 19, the end surface 21 is compressed, the internal volume of the seal cylinder 19 is reduced, and the internal pressure of the seal cylinder 19 is increased. Since the pressing pressure length of the opening end 21 of the seal cylinder 19 at the end 25 is very small, the inside of the seal cylinder 19 is only slightly compressed, and the inflow of ink into the ink reservoir 5 is also very small. Thus, the ink that has entered the ink reservoir 5 returns to the ink chamber 2 when the ink is consumed by writing in actual use, so that the ink reservoir 5 becomes full and the ink flows out from the air groove 12. There is no. Further, when the cap is attached, the inner opening edge 22 of the seal cylinder 19 is fitted from the middle of the opening 24 of the air groove 12 of the conical surface 23 of the ink reservoir to push the opening of the seal cylinder 19 in the radial direction. Since the seal tube 19 is spread while being attached, the opening of the seal tube 19 is deformed when the cap is completely attached even if the shaft center of the seal tube 19 and the shaft center of the shaft tube 1, that is, the shaft center of the base 10 are shifted. The end surface 21 of the seal cylinder 19 and the end portion 25 of the base 10 are securely adhered over the entire circumference. Further, since the inner opening edge 22 of the seal cylinder 19 is fitted from the middle of the opening 24 of the air groove 12 of the conical surface 23 of the ink reservoir 5, the inside of the seal cylinder 19 is aired until the cap is completely attached. It becomes possible to ventilate the outside air through the opening 24 of the groove 12, and air flows in from the tip of the pen tip 9 without being pressurized in the seal cylinder 19, thereby obstructing the outflow of ink and inconvenience for writing. There is no such thing as going out. Ink retainer 5 is extended to the writing tip so as to hold the writing part, thereby helping to reduce the number of parts and making air groove 12 easy.
[0010]
【The invention's effect】
The configuration and operation of the present invention are as described above, and unlike the conventional inner cap, it is not necessary to make it movable while applying a pressing force in the cap, so the number of parts is reduced and assembly is simplified. For this reason, it is possible to maintain good quality at low cost.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a writing instrument of the present invention.
2 is a partial cross-sectional view of a front portion of the writing instrument body with the cap of FIG. 1 removed. FIG.
FIG. 3 is a partial cross-sectional view of the cap with the writing instrument body of FIG. 1 removed.
4 is a cross-sectional view taken along the line AA in FIG.
5 is a view taken in the direction of arrow B in FIG. 3;
FIG. 6 is a reference diagram showing that the end surface of the seal cylinder starts to be fitted from the middle of the opening of the air groove.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Shaft cylinder 2 Ink chamber 3 Circumferential groove 4 Vertical groove 5 Ink storage body 6 Vertical hole 7 Ink guide core 8 Center core 9 Pen tip 10 Cap 11 Gutter part 12 Air groove 13 Cap 14 Engagement protrusion 15 Protrusion part 16 Rib 17 Contacting step portion 18 Locking step portion 19 Seal cylinder 20 Flange portion 21 End surface 22 Inner opening edge 23 Conical surface 24 Opening portion 25 End portion

Claims (1)

In the ink direct storage type writing instrument having a tank for directly storing ink at the rear of the shaft cylinder and having an ink reservoir at the front of the shaft cylinder,
A flange is provided at the rear end of the cup, and a sealing cylinder made of resin or rubber rich in elasticity is attached to the locking step provided in the cap by abutting and locking the flange.
On the other hand, a base is provided at the rear of the conical surface of the tip of the ink reservoir having a tip at the tip, and an air groove is provided between the inner and outer surfaces of the base and the ink reservoir, and communicates with the air groove. An opening is provided from the end of the base to the front conical surface, and when the cap is attached to the front of the shaft tube, the inner opening edge of the seal tube is fitted from the middle of the opening of the conical surface to attach the cap. When the above is completed, the end of the base is brought into contact with the end face of the flange portion of the seal tube so as to be pressed and adhered, and the opening of the air groove and the pen tip are sealed .

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