JP2003200690A - Coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coater capable of easily engaging with a simple constitution. <P>SOLUTION: The coater 1 incorporates a cotton ink container 4 for housing a core cotton 3 impregnated with an ink in a barrel 2 and has an opening 4a of the container 4 formed at one end 2a of the barrel 2, and a distal barrel 5 mounted by screwing with the opening 4a. In the coater 1, a threaded part 5f of an engaging part with the barrel 2 is formed on a rear end ferrule, a threaded part 2b to be screwed with the barrel 5 of the barrel 2 is formed at an inner bore of the opening 4a in such a manner that the part 5f of the barrel 5 can be clamped or unclamped with or from the part 2b of the barrel 2 by a screwing operation, and the part 12b can be inserted into the part 5f by a press injecting operation. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of an applicator, and more particularly to an applicator having a batting housed in a barrel.

[0002]

2. Description of the Related Art Conventionally, in an applicator, a batting impregnated with ink for containing ink in a barrel is accommodated, and the applicator body is replaced by replacing the batting when the ink is used up. A batting applicator adapted to be used continuously is known.

Some batting applicators have a tip shaft at the tip of the barrel which is opened to replace the batting inside the barrel, and the barrel and the leading shaft are formed separately. It is detachably connected. As a method of connecting the shaft cylinder and the front shaft, there are a method of press-fitting and fitting the front shaft into the shaft cylinder, a method of providing a screw portion on the shaft cylinder and the front shaft, and screwing and coupling.

[0004]

However, in a system in which a threaded portion is provided at each of the joining portions of the front shaft and the barrel and they are screwed and fitted, it is usual to tighten and fix them by rotating the threaded portion. However, in actual assembling, since the screw portion is rotated and tightened, there is a problem that it takes time to accumulate. Further, even when the assembly device is used without manual labor, it is necessary to provide a rotation mechanism in the device configuration, which causes a problem that the structure of the device becomes complicated.

The present invention has been made in view of the above problems of the prior art, and an object of the present invention is to provide an applicator which has a simple structure and can be easily screwed.

[0006]

SUMMARY OF THE INVENTION The present invention relates to an applicator, in which an accommodating portion for accommodating ink-impregnated batting is formed inside a shaft cylinder, and an opening of the accommodating part is formed at one end of the shaft cylinder. In an applicator in which a portion is formed and a tip shaft is screwed and attached to the opening, a threaded portion with a barrel is formed at the rear end outer diameter part of the leading shaft, and the barrel is A threaded portion with the tip shaft is formed in the inner diameter portion of the opening, and the threaded portion of the tip shaft and the threaded portion of the barrel can be fastened / released by a screwing operation, and press-fitted. It is characterized in that it can be fitted by an operation.

Further, at least one of the threaded portion formed on the front shaft and the threaded portion formed on the barrel is
It is preferably formed with a length not more than the entire circumference. In addition, an accommodating portion for accommodating ink-impregnated batting is formed inside the shaft cylinder, an opening portion of the accommodating portion is formed at one end side of the shaft cylinder, and a tip shaft is screwed into the opening portion. In the applicator according to the present invention, a threaded portion is formed on one of the tip shaft and the barrel, and a threaded portion transfer surface is formed on a portion facing the other threaded portion. The surface, by pressing the front shaft and the barrel, presses the threaded portion by plastic deformation to a portion contacting the threaded portion to form a transfer threaded portion, and the threaded portions are It is preferable that the screw can be fastened / released by a screwing operation, and can be fitted by a press-fitting operation. Further, it is preferable that the threaded portion is formed such that the thread width of the threaded portion is narrower than the valley width.

According to the present invention, the following effects can be obtained. That is, according to the first aspect of the present invention, since the press-fitting is performed as it is, regardless of the screwing position of the front shaft and the shaft cylinder, the front shaft and the shaft cylinder can be easily assembled. Further, when the assembling device is used, the rotation function can be eliminated, so that the structure can be simplified. Also, by setting the deformation range of the threaded portion to a dimension that does not easily cause plastic deformation, even if the threaded portions ride on each other, the front shaft and the threaded portion of the shaft will deform within the range of elastic deformation You can go back nearby. Therefore, even if the front shaft is removed and the front shaft is screwed again to the shaft for replacement of the batting or ink, the normal screw engagement can be achieved. Moreover, it can be used repeatedly.

Further, according to the second aspect of the invention, since the screwing portion is less than the entire circumference, the pressure input is small, and the screwing portion between the front shaft and the barrel is deformed within the range of elastic deformation. So you can return to near the original shape. Therefore, even if the front shaft is screwed into the shaft cylinder again, normal screw-fitting is possible. Moreover, it can be used repeatedly.

Further, according to the invention of claim 3, since the screwing portion is provided on either the front shaft or the shaft cylinder and the member is press-fitted as it is, the assembling device may be a device having a simple structure, Further, since the threaded portion causes the mating surface to plastically deform to form the transfer threaded portion, the threaded fastening can be normally performed after the plastic deformation. Moreover, it can be used repeatedly.

Further, according to the invention of claim 4, in the threaded portion, by forming the crest width of the threaded portion narrower than the valley width, it is possible to easily get over the threaded portion.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 to 3 are examples of embodiments for carrying out the invention, and FIG. 1 is a cross-sectional view showing a configuration of a joint portion between a tip shaft and a barrel of an applicator according to an embodiment of the present invention, and FIG. FIG. 3 is a detailed cross-sectional view showing the fastening state of the threaded portion of the tip shaft of the applicator and the threaded portion of the barrel, and FIG. 3 shows that the threaded portion of the tip shaft and the threaded portion of the threaded portion of the barrel ride on each other. FIG. 3 is a detailed cross-sectional view showing a closed state. In the drawings, the parts denoted by the same reference numerals as those in the drawings represent the same things.

In this embodiment, as shown in FIG.
A batting container 4 for accommodating a batting 3 impregnated with ink is formed inside, and the batting container 4 is provided at one end of the barrel 2.
Of the applicator 1 having the opening 4a formed therein and the front shaft 5 screwed into the opening 4a. When the batting 3 is replaced, the front shaft 5 is removed from the barrel 2. It is configured such that the batting 3 is removed and the batting 3 is taken out from the batting accommodating portion 4 in the shaft cylinder 2.

The shaft cylinder 2 has a cylindrical outer shape, and one end 2a thereof has an opening 4a of a batting container 4 formed therein.
Are formed. A threaded portion 2b is formed on the inner peripheral portion on the side of the opening 4a, and a batting side (middle side) of the threaded portion 2b is fitted with a front shaft 5 to seal the batting housing portion 4. A convex seal portion 2c is formed. The convex seal portion 2c is formed in a size having a tight margin with respect to the front shaft 5 and the rear portion 5c, projects inward, and continuously projects along the inner circumference.

The tip shaft 5 includes a tip portion 5a to which the pen core 6 is attached, a shaft portion 5b to which a cap (not shown) is detachably fitted, and a rear portion 5c screwed to the barrel 2. have. In addition, a cap is positioned between the shaft portion 5b and the rear portion 5c, and the rear portion 5c is mounted on the barrel 2.
A jaw portion 5d is formed for restricting excessive intrusion into the.

The tip portion 5a has a tapered shape, and the pen core 6 is fitted on the inner diameter side thereof. The shaft portion 5b is formed continuously and stepwise from the tip portion 5a and has a diameter larger than that of the tip portion 5a. The shaft portion 5b
A pen tip side seal portion 5e is formed on the outer peripheral portion of the pen to seal the pen core 6 side which is fitted inside the cap and is arranged inside the cap. The pen tip side seal portion 5e is formed with a size having a tight margin with respect to the inner diameter portion of the cap, projects outward, and is continuously provided along the circumferential direction.

The rear portion 5c has a slightly tapered outer shape, and a screw portion 5f screwed with the screw portion 2b formed on the barrel 2 is formed on the outer peripheral portion thereof. Further, a housing portion side seal portion 5g for contacting the inner diameter portion of the batting container housing 4 and sealing the batting container housing 4 is formed closer to the inner side of the batting container housing 4 than the screw portion 5f. The accommodating portion side seal portion 5g is formed in a size having a tight margin with respect to the inner diameter portion of the shaft tube 2, protrudes outward, and is continuously provided along the circumferential direction.

The structure of the threaded portion 2b on the barrel 2 and the threaded portion 5f on the tip shaft 5 will be described in detail with reference to the drawings. As shown in FIG. 2, the threaded portion 2b of the barrel 2 and the threaded portion 5f of the front shaft 5 are trapezoidal in shape. Further, in the screw portions 2b and 5f, the thread widths W1 of the screw threads 2b1 and 5f1 are respectively valley portions 2b2 and 5f.
It is formed to be narrower than the valley width W2 of f2.

The relationship between the thread width W1 and the height H1 of the threaded portion is set to a dimension such that the thread is not easily plastically deformed within the elastic deformation range. With this configuration,
As shown in FIG. 3, when the screw threads ride on each other, the screw portion is deformed within the range of elastic deformation, so that it can return to the original shape or a state close to it.

Next, the assembling of the barrel 2 and the tip shaft 5 of the applicator of this embodiment will be described with reference to the drawings. In the work of assembling the front shaft 5 to the shaft cylinder 2, when the shaft cylinder 2 and the front shaft 5 are fitted only by press fitting, as shown in FIG. 2, the screw threads 2b1 and 5f1 are in the axial direction (fitting). As shown in FIG. 3, the screw threads 2b1 and 5b
After f1 has passed over each other and overlapped in the circumferential direction, the state shown in FIG. 2 is restored.

In such a fitted state, the state shown in FIG. 3 is the state in which the screw threads 2b1 and 5f1 have the tightest margin. In the present embodiment, the screw thread 2b1,
Since 5f1 is configured to cause elastic deformation within the elastic limit, it is possible to get over the screw thread without causing plastic deformation.

In order to bring the barrel 2 and the front shaft 5 into close contact with each other,
The above-mentioned state is repeated for the number of threads. And
After the shaft cylinder 2 and the front shaft 5 are connected, the screw cylinders 2b1 and 5f1 are pressed against each other by further screwing the shaft cylinder 2 and the front shaft 5, and the shaft cylinder 2 and the front shaft 5 are securely fastened. .

In this way, the applicator 1 can be reliably assembled in a short time by press-fitting the front shaft 5 into the barrel 2 and then slightly tightening the screwed portion.

On the other hand, the applicator 1 at the time of filling replacement and ink supply
When disassembling, the front shaft 5 can be easily removed from the barrel 2 by turning the front shaft 5 in the direction of loosening. Then, even if the screw thread 2 is tightened again by screwing, the thread 2
Since the shapes of b1 and 5f1 are restored to the original shape or a state close to the original shape, they can be normally screw-fitted.

With the above construction, according to the applicator 1 of the present embodiment, when the shaft cylinder 2 and the front shaft 5 are assembled, the front shaft 5 is simply press-fitted into the shaft cylinder 2 as it is, and the threaded portion 2b is formed. 5,
The barrel 2 and the tip shaft 5 can be easily assembled regardless of the formation of f. Therefore, even when assembling the applicator 1 using the assembling apparatus, it is not necessary to provide a rotating function for rotating the screw portion, so that a simple apparatus configuration can be achieved.

Further, according to this embodiment, the screw portion 2b,
Since the configuration of 5f is set such that the deformation range of the screw threads is less likely to be plastically deformed within the elastic deformation limit, the threaded portions 2b, 5f are elastically deformed within the elastic deformation range even when the threads are deformed and ride on each other. Since it deforms, it can be restored to its original shape or a state close to it. Therefore, even when the front shaft 5 is detached from the shaft cylinder 2 and the front shaft 5 is screwed into the shaft cylinder 2 again when the batting 3 is replaced or the ink is replenished, the screw fitting can be normally performed. . Moreover, it can be used repeatedly.

Next, a second embodiment of the present invention will be described in detail with reference to the drawings. 4 to 6 show a second embodiment of the invention.
4 is a cross-sectional view showing the configuration of the joint between the tip shaft of the applicator and the barrel according to the second embodiment of the present invention, and FIG. 5 is the tip shaft of the applicator according to the second embodiment of the present invention. Side view showing the configuration of
FIG. 6 is a sectional view taken along the line AA of FIG. In the figure, the parts denoted by the same reference numerals as the above-mentioned parts represent the same parts, and the description thereof will be omitted.

In the second embodiment, as shown in FIG. 4, a batting 3 for accommodating the ink-filled batting 3 is formed inside the barrel 12, and one end of the barrel 12 is provided with the above-mentioned padding. An applicator 10 in which an opening 14a of a batting part 14 is formed, and a front shaft 15 is screwed into the opening 14a.
It is configured such that the front shaft 15 is removed from the second shaft 2 and the batting 3 is taken out from the batting accommodating portion 14 in the shaft cylinder 12.

The shaft cylinder 12 has a cylindrical outer shape, and an opening portion 14a of the filling pad accommodating portion 14 formed inside is formed at one end portion 12a thereof. A threaded portion 12b is formed on the inner peripheral portion on the side of the opening 14a, and a batting side (middle side) of the threaded portion 12b is fitted with a front shaft 15 to seal the batting accommodating portion 14. A convex seal portion 12c is formed. The convex seal part 12c includes a front shaft 15 and a rear part 15.
It is formed with a size having a tightening margin with respect to c, projects inward, and is continuously projected along the inner circumference.

The tip shaft 15 includes a tip portion 15a to which the pen core 6 is attached, a shaft portion 15b to which a cap (not shown) is detachably fitted, and a rear portion 15c screwed to the shaft cylinder 12. have. Further, the shaft portion 15b and the rear portion 1
A jaw portion 15d for positioning the cap and for restricting the rear portion 15c from excessively entering the barrel 12 is formed between the jaw portion 15d and 5c.

The tip portion 15a has a tapered shape, and the pen core 6 is fitted on the inner diameter side thereof. The shaft portion 15b is formed continuously and stepwise with a diameter larger than that of the tip portion 15a. A pen tip-side seal portion 15e is formed on the outer peripheral portion of the shaft portion 15b so as to close the pen core 6 side which is fitted inside the cap and is arranged inside the cap. The pen tip side seal portion 15e is formed with a size having a tight margin with respect to the inner diameter portion of the cap, and protrudes outward and is continuously provided along the circumferential direction.

The rear portion 15c has a tapered outer shape which is slightly tapered toward the rear end, and the outer peripheral portion of the rear portion 15c is screwed with the screw portion 12b formed on the barrel 12.
f is formed. Further, a housing portion side seal portion 15g for sealing the batting container housing portion 14 by contacting with the inner diameter portion of the batting container housing portion 14 is formed closer to the inner side of the batting container housing portion 14 than the screw portion 15f. The housing side seal part 1
5 g is formed to have a size with a tight margin with respect to the inner diameter portion of the shaft cylinder 12, projects outward, and is continuously provided along the circumferential direction.

The structure of the threaded portion 12b on the barrel 12 and the threaded portion 15f on the front shaft 15 will be described in detail with reference to the drawings. The threaded portion 12b is formed in the inner diameter portion of the barrel 12 along the entire circumference in the circumferential direction. on the other hand,
As shown in FIGS. 5 and 6, the screw portion 15f has a front shaft 1
5 on the outer diameter portion of the rear portion 15c along the circumferential direction of 1 /
In the range of 6, that is, in the range of the circumference angle of 60 °, 18
It is formed at two places at 0 ° symmetry.

The screw portions 12b and 15f each have a trapezoidal cross-sectional shape, similarly to the screw portion of the first embodiment (see FIG. 2). Further, the screw portions 12b and 15f
Are formed so that their respective peak widths W1 are narrower than their respective valley widths W2.

The relationship between the thread width W1 and the height H1 of the threaded portions 12b and 15f is set to a dimension such that the thread is not easily plastically deformed within the elastic deformation range. With this configuration, when the screw threads ride on each other (see FIG. 3), the screw portions 12 b and 15 f are deformed within the range of elastic deformation, and thus the original shape or a state close to it can be restored. it can.

Next, the assembling of the barrel 12 and the tip shaft 15 of the applicator of this embodiment will be described. Shaft cylinder 12 has a front shaft 15
In the work of assembling, when the shaft cylinder 12 and the front shaft 15 are fitted only by press fitting, as in the first embodiment,
After the threads overlap each other in the axial direction (fitting action direction) (see FIG. 2), the threads pass over each other and overlap each other in the circumferential direction (see FIG. 3), and then the screws are screwed again. The peaks are overlapped in the axial direction (fitting action direction) (see FIG. 2). In such a fitted state, as in the first embodiment, the state shown in FIG. 3 is the state in which the screw thread has the largest tightening margin.

In the second embodiment, the screw portions 12b and 15f of the barrel 12 and the tip shaft 15 are configured to elastically deform within the elastic limit, so that the screw threads are formed without causing plastic deformation. You can get over it.

In order to bring the barrel 12 and the front shaft 15 into close contact with each other, the above-described state is repeated for the number of threads. Then, after the shaft cylinder 12 and the front shaft 15 are coupled, the shaft cylinder 12 and the front shaft 15 are further screwed into each other so that the screw portions 12b and 15f are formed.
They are pressed against each other, and the barrel 12 and the front shaft 15 are securely fastened.

In this manner, the applicator 10 has the barrel 1 and the front shaft 1
5 is press-fitted and then slightly tightened, thereby
As with, it can be assembled reliably in a short time.

On the other hand, the applicator 1 at the time of replacing the batting or supplying the ink
When 0 is disassembled, the front shaft 15 can be easily removed from the barrel 12 by turning the front shaft 15 in the direction of loosening. And, even if it is tightened by rotation by screwing again,
Since the screw threads 12b1 and 15f1 have been restored to the original shape or a state close to the original shape, they can be normally screw-fitted.

With the above-described structure, according to the applicator 10 of this embodiment, the threaded portion 12 of the barrel 12 and the tip shaft 15 is provided.
Regardless of the molding positions of b and 15f, the barrel 12 and the front shaft 15 can be easily assembled by simply press-fitting. Therefore, even when the assembling apparatus is used, it is not necessary to provide a rotating function for rotating the screw portion, so that a simple apparatus configuration can be achieved.

Further, according to the second embodiment, the screw portion 1
Since the configurations of 2b and 15f are set so that the deformation range of the screw threads is less likely to be plastically deformed, the screw portions 12b and 15f are deformed within the elastic deformation range even when the threads climb on each other, so that the shape is close to the original shape. You can go back to. Therefore, in order to replace the batting 3 and replenish ink, the shaft cylinder 12
Even if the front shaft 15 is removed from the above and the front shaft 15 is screwed into the shaft cylinder 12 again, the screw shaft can be normally screwed and fitted. Moreover,
It can be used repeatedly.

Further, according to the second embodiment, the threaded portion 15f of the tip shaft 15 has a circumferential angle of 60 ° and a thread angle of 1 °.
Since it is formed only at two positions of 80 ° symmetry, the force of press-fitting the front shaft 15 into the shaft cylinder 12 can be reduced, so that the shaft cylinder 12 and the front shaft 15 can be connected more easily.

Next, a third embodiment of the present invention will be described in detail with reference to the drawings. 7 to 9 show an example of the third embodiment according to the present invention, and FIG. 7 shows the configuration of the joint portion between the tip shaft and the barrel of the applicator according to the third embodiment of the present invention. FIG. 8 is a detailed sectional view showing a state in which the threaded portion transfer surface on the barrel side is plastically deformed by the threaded portion on the tip shaft side of the applicator, and FIG. FIG. 6 is a detailed cross-sectional view showing the shape of a transfer screwing portion generated by plastic deformation. In the figure, the parts denoted by the same reference numerals as the above-mentioned parts represent the same parts, and the description thereof will be omitted.

In the third embodiment, as shown in FIG. 7, a batting 3 for accommodating the ink-filled batting 3 is formed inside the barrel 22, and one end of the barrel 22 is provided with the aforementioned batting. An applicator 20 in which an opening 24a of a batting container 24 is formed and a tip shaft 25 is screwed into the opening 24a.
It is configured such that the front shaft 25 is detached from the second shaft 2 and the batting 3 is taken out from the batting accommodating portion 24 in the shaft cylinder 22.

The shaft cylinder 22 has a cylindrical outer shape, and an opening 24a of a batting container 24 formed inside is formed at one end 22a thereof. A threaded portion transfer surface 22b is formed on the inner peripheral portion on the side of the opening 24a, and a batting side (middle side) of the threaded portion transfer surface 22b is fitted with the front shaft 25 to fill the batting area. Convex seal portion 22 for sealing 24
c is formed.

The threaded portion transfer surface 22b has a flat inner peripheral surface having a size having a tightening margin with respect to a threaded portion 25f of a front shaft 25, which will be described later. The convex seal part 2
2c is formed to have a size with a tight margin with respect to the rear portion 25c of the front shaft 25, projects inward, and continuously projects along the inner circumference.

The front shaft 25 has a tip portion 25a to which the pen core 6 is attached, a shaft portion 25b to which a cap (not shown) is detachably fitted, and a rear portion 25c screwed to the shaft cylinder 22. have. Further, the shaft portion 25b and the rear portion 2
A jaw portion 25d for positioning the cap and for restricting the rear portion 25c from excessively entering the barrel 22 is formed between the jaw portion 25d and 5c.

The tip portion 25a has a tapered shape, and the pen core 6 is fitted on the inner diameter side thereof. The shaft portion 25b is formed continuously and stepwise from the tip portion 25a and has a diameter larger than that of the tip portion 25a. A pen tip side seal portion 25e is formed on the outer peripheral portion of the shaft portion 25b so as to close the pen core 6 side which is fitted into the cap and arranged inside the cap. The pen tip side seal portion 25e is formed with a size having a tight margin with respect to the inner diameter portion of the cap, and protrudes outward and is continuously provided along the circumferential direction.

The rear portion 25c has a slightly tapered outer shape, and a screw portion 25f is formed on the outer periphery of the rear portion 25c so as to come into contact with the screw portion transfer surface 22b formed on the shaft cylinder 22. In addition, the batting container 24 is more than the screw 25f.
A container-side seal portion 25g for contacting the inner diameter portion of the batting container 24 and sealing the batting container 24 is formed on the inner side. The accommodating portion side seal portion 25g is formed with a size having a tight margin with respect to the inner diameter portion of the shaft cylinder 22,
It projects toward the outside and is continuously provided along the circumferential direction.

The screw portion 25f is, as shown in FIG.
It has a trapezoidal sectional shape. Also, the screw portion 25
f is formed such that the thread width W1 of the screw thread 25f1 is narrower than the valley width W2.

Next, the assembling of the barrel 22 and the tip shaft 25 of the applicator 20 of the third embodiment will be described. When the front shaft 25 is attached to the shaft cylinder 22, the opening 24 of the shaft cylinder 22 is used.
The rear portion 22c of the front shaft 25 is inserted into a, and the shaft cylinder 22 and the front shaft 25 are press-fitted into each other.

At this time, the threaded portion 25f of the front shaft 25 is fitted to the threaded portion transfer surface 22b of the barrel 22 with a tight margin. In the threaded portion transfer surface 22b, as shown in FIGS. 8 and 9, the portion of the front shaft 25 that is pressed against the threaded portion 25f undergoes plastic deformation, and along the thread shape of the threaded portion 25f. The recessed concave threaded portion 22b1 is formed,
In addition, the threaded portion transfer surface 2 has a shape along the valley of the threaded portion 25f.
2b is left. That is, the barrel 22 and the tip shaft 25 are
The threaded portion transfer surface 22b and the threaded portion 25f are joined together as if they were screwed together.

On the other hand, the applicator 2 at the time of filling replacement and ink supply
When disassembling 0, the front shaft 25 can be easily removed from the barrel 22 by turning the front shaft 25 in the direction of loosening. And, even if it is tightened by rotation by screwing again,
Since the concave threaded portion 22b1 which is plastically deformed by the threaded portion 25f of the front shaft 25 is formed on the threaded portion transfer surface 22b of the barrel 22, it can be normally screwed and fitted.

With the above construction, according to the applicator 20 of the third embodiment, when the shaft cylinder 22 and the front shaft 25 are assembled, the shaft cylinder 22 and the front shaft 2 can be easily inserted simply by press fitting.
5 can be assembled. Therefore, even when the assembling apparatus is used, it is not necessary to provide a rotating function for rotating the screw portion, so that a simple apparatus configuration can be achieved.

Further, since the concave threaded portion 22b1 corresponding to the threaded portion 25f of the front shaft 25 is formed on the threaded portion transfer surface 22b of the inner diameter portion of the barrel 22 by plastic deformation, replacement of the batting 3 and ink Even if the front shaft 25 is detached from the shaft cylinder 22 for replenishment and the like, and the front shaft 25 is screwed into the shaft cylinder 22 again, it can be normally screwed and fitted. Moreover, it can be used repeatedly.

In the above-described embodiment, the thread portion has a trapezoidal sectional shape, and the thread width W1 is the valley width W.
Although it is configured to be narrower than 2, the present invention is merely an example of the embodiment of the present invention, and the present invention is not limited to this, and various changes are made without departing from the scope of the present invention. Of course, it is possible to add. For example, the thread may have a triangular cross-section or a corrugated cross-section, and the screw part may have a single-thread screw or a multi-thread screw. It is not limited to.

[0058]

As described above, the first aspect of the present invention is as described above.
According to the applicator described in any one of the items (1) to (4), it is possible to realize an applicator that has a simple structure and can assemble the barrel and the front shaft, and that can be easily screwed. Specifically, according to the first aspect of the invention, the front shaft and the shaft cylinder can be easily assembled by press-fitting as they are, regardless of the positions of the screwed portions of the front shaft and the shaft cylinder. Further, even when assembling is performed using the assembling apparatus, it is not necessary to provide the rotating function, so that a simple apparatus configuration can be realized. In addition, by deforming the shape of the threaded portion between the barrel and the front shaft within the range of elastic deformation to set the dimensions such that plastic deformation is unlikely to occur, the original shape or a state close to it can be restored. Therefore, even if the front shaft is removed and the front shaft is screwed again to the shaft for replacement of the batting or ink, the normal screw engagement can be achieved. Moreover, it can be used repeatedly. Further, according to the invention of claim 2, since the formation of the screw-engaged portion is in a partial range over the entire circumference, the pressure input can be small, and the screw-engaged portion between the front shaft and the barrel is small. Since it deforms within the range of elastic deformation, it can return to near the original shape. Therefore, even if the front shaft is screwed into the shaft cylinder again, normal screw-fitting is possible. Moreover, it can be used repeatedly. According to the invention of claim 3,
It is possible to easily assemble the front shaft and the shaft cylinder by providing a threaded portion on either the front shaft or the shaft cylinder and press-fitting as they are. Further, even when assembling is performed using the assembling apparatus, it is not necessary to provide the rotation function, so that a simple apparatus configuration can be realized. Further, since the screwing portion is configured to cause the other surface to undergo plastic deformation to form the transfer screwing portion, it is possible to normally screw and fasten after the plastic deformation. Moreover, it can be used repeatedly. Further, according to the invention of claim 4, in the threaded portion, the crest width of the threaded portion is formed to be narrower than the valley width, so that the threaded portion can be easily climbed over. As described above, the excellent effect is achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a joint portion between a tip shaft and a barrel of an applicator according to an embodiment of the present invention.

FIG. 2 is a detailed cross-sectional view showing a fastening state of a threaded portion of a tip shaft and a threaded portion of a barrel of the applicator.

FIG. 3 is a detailed cross-sectional view showing a state in which the threaded portion of the front shaft and the threaded portion of the threaded portion of the barrel are mounted on each other.

FIG. 4 is a cross-sectional view showing a configuration of a joint between a tip shaft and a barrel of an applicator according to a second embodiment of the present invention.

FIG. 5 is a side view showing a configuration of a tip shaft of the applicator.

6 is a cross-sectional view taken along the line AA of FIG.

FIG. 7 is a cross-sectional view showing a configuration of a joint portion between a tip shaft and a barrel of an applicator according to a third embodiment of the present invention.

FIG. 8 is a detailed cross-sectional view showing a state in which a threaded portion on the tip shaft side of the applicator causes plastic deformation of a threaded portion transfer surface on the barrel side.

FIG. 9 is a detailed cross-sectional view showing a shape of a transfer screwing portion generated by plastically deforming the screwing portion transfer surface.

[Explanation of symbols]

1, 10, 20 applicator 2, 12, 22 shaft cylinder 2a, 12a, 22a One end 2b, 12b, 22b Screw surface transfer surface 2b1, 12b1 screw thread 2b2 Tanibe 22b1 concave threaded portion 22c rear 3 batting 4, 14, 24 Filling area 4a, 14a, 24a openings 5,15,25 Toe 5a, 15a, 25a Tip 5b, 15b, 25b Shaft 5c, 15c, 25c rear 5d, 15d, 25d jaw 5f, 15f, 25f screw part 6 Pen core 25f1 screw thread W1 mountain width W2 valley width

Claims (4)

[Claims] 1. An accommodation section for accommodating a batting impregnated with ink is formed inside the barrel, an opening of the accommodation section is formed at one end side of the barrel, and a front shaft is screwed into the opening. In the applicator to be fitted together, the front shaft is formed with a threaded portion with a shaft cylinder at a rear end outer diameter portion thereof, and the shaft cylinder is screwed with a front shaft at an inner diameter portion of the opening. A coating portion is formed, and the threaded portion of the leading shaft and the threaded portion of the barrel are fastened / releasable by a screwing operation, and can be fitted by a press-fitting operation. Ingredient 2. The threaded portion of at least one of the threaded portion formed on the front shaft and the threaded portion formed on the barrel is formed to have a length not more than the entire circumference. The applicator according to claim 1. 3. An accommodation section for accommodating a batting impregnated with ink is formed inside the barrel, an opening of the accommodation section is formed at one end side of the barrel, and a front shaft is screwed into the opening. In the applicator to be fitted together, a threaded portion is formed on one of the tip shaft and the barrel, and a threaded portion transfer surface is formed on a portion facing the other threaded portion. When the front shaft and the barrel are pressed into contact with each other, a transfer screwing portion corresponding to the screwing portion is formed by plastic deformation in a portion in contact with the screwing portion, and the screwing portion has a screwing portion. The applicator is characterized in that the two can be fastened / released by a screwing operation and can be fitted by a press-fitting operation. 4. The applicator according to claim 1, wherein the threaded portion of the threaded portion is formed such that the thread width of the thread of the threaded portion is narrower than the valley width.