JP3173206U - Welding toothbrush and manufacturing method thereof - Google Patents

Abstract

An object of the present invention is to provide a welding toothbrush capable of producing a welding toothbrush having excellent adhesion between a bristle bundle and a brush pedestal and having a thin brush pedestal.
A concave portion for fixing a thermoplastic resin yarn bundle is provided in a brush pedestal portion of a welding toothbrush, and at least one through small hole portion 2c and at least one non-through small hole portion 2b are provided in the concave portion. Is provided. The thermoplastic resin yarn bundle is fixed by melting a part of the thermoplastic resin yarn bundle, flowing into the recess, and cooling.
[Selection] Figure 4

Description

  The present invention relates to a welding toothbrush and a manufacturing method thereof.

  Conventionally, a toothbrush has been manufactured by inserting a bristle bundle of a toothbrush into a bristle insertion hole and fixing it with a metal member called a flat wire. The toothbrush manufactured by this method cannot reduce the distance between the hair bundles, and there is a limit to the selection of the amount of hair and the material of the hair. In addition, there are problems in that the use of people who are allergic to metals is restricted, and that it takes time to separate the toothbrush when it is discarded.

In order to solve the above problem, a method of connecting the hair bundle to the handle member of the toothbrush using the property that the synthetic resin hair bundle melts and solidifies is used.
Cited Document 1 discloses a toothbrush in which an integral fusion piece with bundling hairs is separately formed and the fusion piece is attached to a brush base.
Cited Document 2 discloses a toothbrush in which a hair bundle is fixed integrally to a brush pedestal of a toothbrush. Cited Document 2 discloses a method of injecting and adhering a fixing filler from the back side of the brush base in order to fix the brush base and the hair bundle.

JP 1997-220126 A JP 2003-135154 A

In the toothbrush to which the synthetic resin of the cited document 1 and the cited document 2 is welded, it is necessary to sufficiently secure the adhesive strength. When the adhesive strength is not sufficient, the adhesive part peels off due to the force applied by repeated reciprocating movements when brushing teeth, and the hair bundle may come off the brush base.
However, when the adhesive strength is sufficiently increased, there is a problem that the thickness of the adhesive portion of the brush base increases. When the thickness of the brush pedestal increases, there are problems that it is not suitable for use by people with relatively small mouths such as infants, children, and women, and that it cannot brush the molars.

  In order to solve the above-mentioned problems, the present inventors have provided a recess for fixing the thermoplastic resin yarn bundle in the brush pedestal of the welding toothbrush, and at least one through small hole in the recess. The present inventors have found that by providing at least one non-penetrating small hole portion, the adhesion between the hair bundle and the brush pedestal is excellent, and the thickness of the brush pedestal can be reduced.

  The present invention relates to a welding toothbrush having a handle as a handle, a brush pedestal provided at a tip of the handle, and a thermoplastic resin yarn bundle fixed to the brush pedestal. A brush pedestal according to the present invention has a recess for fixing a thermoplastic resin yarn bundle, and the brush pedestal includes at least one through small hole connected to the concave and at least one non-through small hole. Have A thermoplastic resin yarn bundle melts a part of a thermoplastic resin yarn bundle, flows a part thereof into a through small hole part, a non-through small hole part, and a concave part, and then cools and fixes the brush. Fixed to the recess of the pedestal. According to the present invention, it is possible to obtain a toothbrush having excellent adhesion between the bristle bundle and the brush base and having a thin brush base.

  In a preferred embodiment of the present invention, the recess of the brush pedestal portion is composed of a bottom surface portion and a side wall along the shape of the brush pedestal portion, and the side wall is formed so as to surround the periphery of the bottom surface portion. The small through hole portion has a through hole and a non-through portion larger than the diameter of the through hole around the through hole from the side close to the bottom surface of the concave portion toward the inside of the brush base portion. It is configured. Furthermore, the non-penetrating small hole portion has a non-penetrating small hole having an inclination of 30 ° or more and 60 ° or less with respect to the bottom surface portion toward the inside of the brush pedestal portion. In the present invention, the through hole is a two-stage small hole including a through hole and a non-through part around the through hole, and the non-through hole is provided so as to be inclined with respect to the bottom surface of the brush base. Yes. Thereby, the adhesiveness of a bristle bundle and a brush base can further be improved, and a toothbrush with a thin brush base thickness can be obtained.

  In a preferred embodiment of the present invention, the diameter of the yarn constituting the thermoplastic resin yarn bundle is not less than 0.03 mm and not more than 0.09 mm, and this fused toothbrush can be cleaned at the same time as the tooth surface. In the present invention, it is possible to use an extra fine thread having a thread diameter of 0.09 mm or less, and thereby it is possible to obtain a welding toothbrush capable of cleaning the tongue surface in addition to cleaning the tooth surface.

  In a preferred embodiment of the present invention, the number of yarns constituting the thermoplastic resin yarn bundle is not less than 4,000 and not more than 10,000, and this fused toothbrush can clean the tongue surface simultaneously with the tooth surface cleaning. In the present invention, it is possible to use a large number of yarns having a number of yarns of 4,000 or more and 10,000 or less, and thereby it is possible to obtain a welding toothbrush capable of cleaning the tongue surface in addition to cleaning the tooth surface. .

  In a preferred embodiment of the present invention, the yarn bundle constituting the thermoplastic resin yarn bundle has a yarn bundle length of 2 mm or more and 5 mm or less from the fixing point to the tip, and this welding toothbrush is used for cleaning the tooth surface simultaneously with the tongue surface. Cleaning is also possible. In the present invention, it is possible to suppress the yarn bundle length to a relatively short yarn length of 2 mm or more and 5 mm or less, and thus it is possible to obtain a welding toothbrush that can clean the tongue surface in addition to cleaning the tooth surface.

  In a preferred embodiment of the present invention, the thermoplastic resin yarn bundle is composed of at least two kinds of yarns of different materials, and the thermoplastic resin yarn bundle has a first diameter of 0.03 mm or more and less than 0.06 mm. And a second yarn having a diameter of 0.06 mm to 0.09 mm. In the present invention, it is possible to obtain a fused toothbrush that can effectively remove plaque and clean the tongue surface by producing a yarn bundle from yarns of different materials.

  In a preferred embodiment of the present invention, the thermoplastic resin yarn bundle is composed of at least two types of yarn bundles having different shapes. In the present invention, it is possible to obtain a fused toothbrush capable of effectively removing plaque and cleaning the tongue surface by making the yarn bundles have different shapes.

  The present invention relates to a welding toothbrush handle having a handle portion as a handle and a brush pedestal portion provided at a tip portion of the handle portion. The brush base according to the present invention has a recess for fixing the thermoplastic resin yarn bundle, and the recess has at least one through-hole and at least one non-through-hole. According to the present invention, it is possible to obtain a toothbrush handle having excellent adhesion between the bristles and the brush base and having a thin brush base.

  In a preferred embodiment of the present invention, the recess of the brush pedestal portion is composed of a bottom surface portion and a side wall along the shape of the brush pedestal portion, and the side wall is formed so as to surround the bottom surface portion. The portion has a through hole and a non-penetrating portion larger than the diameter of the through hole around the through hole from the side close to the bottom surface of the concave portion toward the inside of the brush pedestal portion. The hole portion has a non-through small hole having an inclination of 30 ° or more and 60 ° or less with respect to the bottom surface portion toward the inside of the brush pedestal portion. In the present invention, the through hole portion is a small hole portion composed of a through hole and a non-through portion around the through hole, and the non-through hole portion is inclined with respect to the bottom surface portion of the brush base. I am doing so. As a result, it is possible to obtain a toothbrush handle in which the adhesion between the hair bundle and the brush pedestal is further improved and the thickness of the brush pedestal is thin.

  According to the present invention, a concave portion for fixing the thermoplastic resin yarn bundle is provided in the brush pedestal portion of the welding toothbrush, at least one through small hole portion connected to the concave portion in the brush pedestal, and at least one non-penetrating portion By providing the small hole portion, it is possible to obtain a toothbrush having excellent adhesion between the hair bundle and the brush pedestal portion and having a thin brush pedestal portion.

  The thickness of the above-described toothbrush pedestal is 2 mm or more and 3 mm or less, and can be about half the thickness of the average brush pedestal of a conventional implantable toothbrush. As a result, even a person with a relatively small mouth, such as an infant, a child, or a woman, can easily brush up to the last molar and can effectively remove plaque.

  Furthermore, in the above-described toothbrush, it is possible to use an ultrafine yarn bundle having a yarn diameter of 0.03 mm to 0.09 mm, and the yarn bundle length can be suppressed to 3 mm to 7 mm, preferably 2 mm to 5 mm. In addition to removing dental plaque between tooth surfaces and teeth, it is possible to clean the tongue at the same time.

FIG. 1 is a plan view showing the entire thread bundle welding die. FIG. 2 is a cut view of the yarn bundle welding die cut along the AA section. FIG. 3 is a plan view showing the whole of the welding toothbrush handle. FIG. 4 is a cross-sectional view of the welding toothbrush handle taken along the line BB. FIG. 5 is a front view showing a process of passing the yarn bundle through the welding die base small hole, heating and melting with a heater, and welding and fixing to the welding toothbrush handle. FIG. 6 is a front view of an image showing the melted state of the yarn bundle. FIG. 7 is a front view showing a cutting process after the yarn bundle is welded to the welding toothbrush handle. FIG. 8 is a photograph showing the comparison between the completed welding toothbrush and the implanted toothbrush.

  Hereinafter, the form for implementing this invention is demonstrated. The present invention is not limited to the embodiments described below, and includes those appropriately modified by those skilled in the art from the following embodiments.

  The present invention relates to a welding toothbrush having a handle as a handle, a brush pedestal provided at a tip of the handle, and a thermoplastic resin yarn bundle fixed to the brush pedestal. The welding toothbrush according to the present invention is obtained by adhering a thermoplastic resin yarn bundle to the brush pedestal portion by welding. The welding toothbrush is manufactured using a yarn bundle welding mold 1. FIG. 1 shows the entire thread bundle welding die 1. The yarn bundle welding die 1 includes a yarn bundle welding die base portion 1a for molding and fixing a melt resin of the yarn bundle, a yarn bundle welding die yarn bundle small hole portion 1b for feeding the yarn bundle, and a yarn bundle welding die. The mold penetrating part 1c is included. FIG. 2 shows a sectional view of the yarn bundle welding mold 1 shown in FIG.

FIG. 3 shows the welding toothbrush handle 2. The welding toothbrush handle 2 is provided with a brush pedestal at the tip of the handle portion. The brush base is provided with a recess for fixing the thermoplastic resin yarn bundle, and a side wall 2a is provided so as to surround the periphery of the recess. In addition, the dotted line of the brush base of FIG. 2 has shown the outer periphery shape of the recessed part.
A recessed part means the recessed part provided in the brush base. A recessed part is comprised by the side wall formed so that a bottom face part and its bottom face part and its bottom face part may be enclosed. In the present invention, the bottom surface and the side wall serve as a boundary surface between the brush base and the recess. The shape of the outer periphery of the recess is preferably the shape of a brush pedestal, and is preferably a substantially square shape or a substantially oval shape. The thickness of the recess is 1 mm or more and 3 mm or less, preferably 1.5 mm or more and 2.5 mm or less.
The welding toothbrush handle 2 has at least one through small hole portion 2c and at least one non-through small hole portion 2b in the recess of the brush base. FIG. 4 shows a cross-sectional view of the welding toothbrush handle 2 shown in FIG. 3 taken along the line AA.
The yarn bundle welding die pedestal portion 1a of the yarn bundle welding die 1 has a structure in which a side wall 2a surrounding the recess of the welding toothbrush handle pedestal portion of the welding toothbrush handle 2 is fitted. The yarn bundle welding die base portion 1a has a structure in which the side wall 2a surrounding the periphery of the concave portion of the welding toothbrush handle base portion of the welding toothbrush handle 2 is fitted. It can be bonded efficiently.

Next, a method for fixing the melted yarn bundle to the welding toothbrush handle 2 will be described in detail with reference to FIGS.
In FIG. 5, the thread bundle 4 is inserted into the thread bundle welding mold thread bundle small hole 1b, which is plural in the thread bundle welding mold base 1a of the thread bundle welding mold 1, from the bottom surface. . The yarn bundle 4 preferably protrudes from 4 mm to 7 mm in size from the upper surface of the yarn bundle welding die base portion 1a of the yarn bundle welding die 1.
In FIG. 5, a heater 3 and a welding toothbrush handle 2 are shown on the upper portion of the yarn bundle welding mold 1. The yarn bundle 4 protruded from 4 mm to 7 mm from the upper surface of the yarn bundle welding die pedestal portion 1 a is heated by the heater 3. As a result, the protruding portion of the yarn bundle 4 is melted and softened or liquefied.
FIG. 6 shows an image diagram of a state in which the protruding portion of the yarn bundle 4 is melted and softened or liquefied. 6a of FIG. 6 has shown the melting image of the protrusion part of the yarn bundle 4. FIG.

When the protruding portion of the yarn bundle 4 is melted and softened or liquefied, the welding toothbrush handle pedestal side wall 2a portion of the welding toothbrush handle 2 is fitted into the yarn bundle welding mold pedestal portion 1a and compressed. As a result, the welded portion of the yarn bundle 4 flows into the penetrating small hole portion 2c and the non-penetrating small hole portion 2b of the concave portion of the brush pedestal and the concave portion of the brush pedestal, and is then cooled and fixed at the same time.
In a preferred embodiment of the present invention, the recess of the brush pedestal portion is composed of a bottom surface portion and a side wall along the shape of the brush pedestal portion, and the side wall is formed so as to surround the periphery of the bottom surface portion. The through small hole portion 2c sequentially has a through hole and a non-through portion larger than the diameter of the through hole around the through hole from the side close to the bottom surface of the concave portion toward the inside of the brush base portion. The non-penetrating small hole portion 2b has non-penetrating small holes having an inclination of 30 ° or more and 60 ° or less with respect to the bottom surface portion toward the inside of the brush pedestal portion.
In the present invention, the welded portion of the yarn bundle 4 is engaged with the two small holes in the recess of the brush base at different angles, so that the yarn bundle 4 is firmly fixed to the brush base. Further, the through small hole portion 2c sequentially has a through hole and a non-through portion larger than the diameter of the through hole around the through hole from the side close to the bottom surface of the concave portion toward the inside of the brush base portion. Therefore, when the yarn bundle melting resin flows into the non-penetrating portion at the upper part of the through hole and solidifies, the welded portion of the non-penetrating portion is caught and the yarn bundle 4 is firmly fixed to the brush base. Become.

  FIG. 7 shows a process of cutting the yarn bundle 4 by the cutting machine 5 after completion of the fusion molding. After cutting the yarn bundle 4 by the cutting machine 5, it is possible to further provide a step of finishing cutting the tip portion of the yarn bundle 4 and processing the end surface of the yarn bundle into a spherical shape or a conical shape. The remaining yarn bundle after cutting the yarn bundle 4 becomes the yarn bundle 4 of the next welding toothbrush and is repeatedly manufactured. In the present invention, the distance between the yarn bundles of the yarn bundle 4 can be adjusted by using the yarn bundle welding mold 1 when manufacturing the welding toothbrush. Moreover, by using the yarn bundle welding die 1 when manufacturing the welding toothbrush, the portion where the yarn bundle 4 is heated and melted can be adjusted, and the yarn bundle 4 is prevented from being melted unnecessarily. it can. In addition, by using the yarn bundle welding die 1 when manufacturing the welding toothbrush, the yarn bundle 4 is cut along the yarn bundle welding die 1 in the process of cutting the yarn bundle 4 by the cutting machine 5. The cut surface of the yarn bundle 4 can be cut linearly and efficiently.

  The welding toothbrush manufactured by the process mentioned above is excellent in the adhesiveness of the bristle bundle 4 and a brush base. Furthermore, in the welding toothbrush according to the present invention, the yarn bundle 4 is firmly fixed to the brush pedestal by the welded portion of the yarn bundle 4 engaging with the two small holes of the recess of the brush pedestal at different angles. . In the through small hole portion 2c, the yarn bundle melting resin flows into the non-penetrating portion at the upper portion of the through hole and solidifies, so that the welded portion of the non-penetrating portion is caught. It is fixed to and will not come off. Furthermore, since the yarn bundle 4 is firmly fixed to the brush pedestal as described above, the thickness of the welded portion of the brush pedestal may be small. For this reason, the thickness of the brush pedestal of the welding toothbrush according to the present invention can be reduced. The thickness of the brush pedestal of the welding toothbrush according to the present invention is not less than 2 mm and not more than 3 mm, and can be about half the thickness of the average brush pedestal of a conventional implantable toothbrush. As a result, even a person with a relatively small mouth, such as an infant, a child, or a woman, can easily brush up to the last molar and can effectively remove plaque.

  FIG. 8 shows photographs showing a welding toothbrush (upper figure) according to the present invention and a conventional implantable toothbrush (lower figure). As can be seen from the photograph attached to FIG. 8, it can be seen that the thickness of the brush base of the welding toothbrush according to the present invention is thinner than that of the conventional toothbrush.

  The thermoplastic resin yarn bundle of the welding toothbrush according to the present invention is a bundle of dozens or hundreds of thousands of thin thread-like resins made of thermoplastic resin. The thermoplastic resin is melted by being heated to the melting point, and becomes a softened or liquefied state. The thermoplastic resin is solidified by melting and softening or liquefying and then cooling. In the welding toothbrush according to the present invention, this thermoplastic resin property is used to bond the thermoplastic resin yarn bundle and the brush pedestal.

  The thermoplastic resin yarn bundle of the welding toothbrush according to the present invention includes, as a thermoplastic resin, polybutylene terephthalate resin, polypropylene terephthalate resin, polyethylene terephthalate resin, polyethylene naphthalate resin, PCTA resin, PCTG resin, and other polyester resins, polyacetal A resin mainly composed of a resin selected from a resin (homopolymer, copolymer), polycarbonate resin, aliphatic polyamide resin, and aromatic polyamide resin can be employed. The temperature at which the protruding portion of the yarn bundle 4 is heated and melted by the heater 3 to be softened or liquefied varies depending on the type of thermoplastic resin used, but is about 190 to 230 ° C. for polybutylene terephthalate resin and polypropylene terephthalate resin. Further, in the case of heating and melting with air, compared to heating and melting with a non-contact hot plate or the like, this is a preferable melting method with less discoloration due to scorching on the surface of the yarn bundle. The time required for melting the protruding portion of the yarn bundle 4 may be about 10 to 20 seconds.

  In the welding toothbrush according to the present invention, the diameter of the yarn constituting the thermoplastic resin yarn bundle is 0.02 mm to 0.5 mm, preferably 0.05 mm to 0.4 mm, and more preferably 0.1 mm to 0 mm. .3 mm or less. Since a thermoplastic resin yarn bundle having a small yarn diameter can be used, the fused toothbrush according to the present invention can clean the tongue surface simultaneously with the tooth surface cleaning. Furthermore, since the thing which has a small diameter of the thread | yarn which comprises a thermoplastic resin yarn bundle | flux can be employ | adopted, it is suitable also for cleaning between teeth and can remove the plaque between teeth effectively.

  In the welding toothbrush according to the present invention, the number of yarns constituting the thermoplastic resin yarn bundle is 50 or more and 100,000 or less, preferably 500 or more and 50,000 or less, and more preferably 1,000 or more. The number is 20,000 or less. Because the number of yarns that make up the thermoplastic resin yarn bundle is large, the fusing toothbrush according to the present invention can clean the tooth surface simultaneously with the cleaning of the tooth surface. Furthermore, since the number of yarns constituting the thermoplastic resin yarn bundle is large, it can be used for a long time as a toothbrush and is economical.

  In the welding toothbrush according to the present invention, the yarn bundle constituting the thermoplastic resin yarn bundle has a yarn bundle length from 1.5 mm to 8 mm, preferably from 2 mm to 5 mm, from the fixing point to the tip. By adopting a short yarn bundle length constituting the thermoplastic resin yarn bundle, the tongue surface can be effectively cleaned simultaneously with the tooth surface cleaning.

  The thermoplastic resin yarn bundle of the welding toothbrush according to the present invention is composed of at least two kinds of yarns of different materials, and the thermoplastic resin yarn bundle has a diameter of 0.03 mm or more and less than 0.06 mm. And a second yarn having a diameter of 0.06 mm to 0.09 mm. For example, the thermoplastic resin yarn bundle at the tip of the brush pedestal has a relatively small diameter of 0.03 mm to less than 0.06 mm, and the rear portion of the brush pedestal has a relatively large diameter of 0.06 mm to 0.09 mm. Can be. As a result, it is possible to brush between the back teeth, which are difficult to brush, at the tip of the brush. Further, by forming the thermoplastic resin yarn bundle from at least two kinds of yarns of different materials and from yarns having different diameters, it is possible to obtain a toothbrush that matches the characteristics of the human tooth profile. As a result, it is possible to effectively remove the molars and the dental plaque on the back side of the teeth, which are considered difficult to polish.

  The thermoplastic resin yarn bundle of the welding toothbrush according to the present invention is composed of at least two types of yarn bundles having different shapes. For example, the thermoplastic resin yarn bundle at the tip of the brush pedestal may have a smaller number of yarn bundles or a longer yarn bundle length. The thermoplastic resin yarn bundle at the center of the brush pedestal may have a larger number of yarn bundles and a shorter yarn bundle length. By forming the thermoplastic resin yarn bundle from at least two types of yarn bundles having different shapes, a toothbrush suitable for a person with a relatively small mouth such as an infant, a child, or a woman can be obtained. As a result, it is possible to effectively remove the molars and the dental plaque on the back side of the teeth, which are considered difficult to polish. Moreover, the toothbrush suitable for tongue surface cleaning can be obtained by comprising the thermoplastic resin yarn bundle from yarn bundles having at least two different shapes.

DESCRIPTION OF SYMBOLS 1 Yarn bundle welding die 1a Yarn bundle welding die base part 1b Yarn bundle welding mold thread bundle small hole part 1c Yarn bundle welding mold penetration part 2 Welding toothbrush handle 2a Side wall 2b Non-through small hole part 2c Small hole part 3 Heater 4 Yarn bundle 4a Yarn bundle melting image 5 Cutting machine

Claims (9)

A welding toothbrush having a handle portion as a handle, a brush pedestal portion provided at a tip portion of the handle portion, and a thermoplastic resin yarn bundle fixed to the brush pedestal portion,
The brush pedestal has a recess for fixing the thermoplastic resin yarn bundle,
The brush pedestal has at least one through small hole connected to the recess and at least one non-through small hole,
The thermoplastic resin yarn bundle is cooled and fixed after melting a part of the thermoplastic resin yarn bundle and allowing the part to flow into the through small hole portion, the non-through small hole portion, and the concave portion. The welding toothbrush fixed to the said recessed part of the said brush base by doing. The welding toothbrush according to claim 1,
The concave portion of the brush pedestal portion is composed of a bottom surface portion and a side wall along the shape of the brush pedestal portion,
The side wall is formed so as to surround the bottom portion,
The through small hole portion has a through hole and a non-through portion larger than the diameter of the through hole around the through hole from the side close to the bottom surface of the concave portion toward the inside of the brush pedestal portion. ,
The welding toothbrush characterized in that the non-penetrating small hole portion has a non-penetrating small hole having an inclination of 30 ° or more and 60 ° or less with respect to the bottom surface portion toward the inside of the brush pedestal portion.   The diameter of the thread which comprises the said thermoplastic resin yarn bundle is 0.03 mm or more and 0.09 mm or less, The tongue surface cleaning is also possible simultaneously with a tooth surface cleaning, The Claim 1 or Claim 2 characterized by the above-mentioned. Welding toothbrush.   The number of yarns constituting the thermoplastic resin yarn bundle is 4,000 or more and 10,000 or less, and the tongue surface can be cleaned simultaneously with the tooth surface cleaning. The welding toothbrush according to claim 1.   The yarn bundle constituting the thermoplastic resin yarn bundle has a yarn bundle length of 2 mm or more and 5 mm or less from a fixing point to a tip, and can be cleaned at the same time as the tooth surface. The welding toothbrush of any one of Claim 1 to 4. The thermoplastic resin yarn bundle is composed of at least two types of different material yarns,
The thermoplastic resin yarn bundle is composed of a first yarn having a diameter of 0.03 mm or more and less than 0.06 mm and a second yarn having a diameter of 0.06 mm or more and 0.09 mm or less. The welding toothbrush according to any one of claims 1 to 5.   The fusion toothbrush according to any one of claims 1 to 6, wherein the thermoplastic resin yarn bundle is composed of at least two types of yarn bundles having different shapes. A handle as a handle, and a brush pedestal provided at the tip of the handle,
The brush pedestal has a recess for fixing the thermoplastic resin yarn bundle,
The recess is a welding toothbrush handle having at least one through-hole and at least one non-through-hole. A welding toothbrush handle according to claim 8,
The concave portion of the brush pedestal portion is composed of a bottom surface portion and a side wall along the shape of the brush pedestal portion,
The side wall is formed so as to surround the bottom portion,
The through small hole portion has a through hole and a non-through portion larger than the diameter of the through hole around the through hole from the side close to the bottom surface of the concave portion toward the inside of the brush pedestal portion. ,
The welding toothbrush handle characterized in that the non-penetrating small hole portion has a non-penetrating small hole having an inclination of 30 ° or more and 60 ° or less with respect to the bottom surface portion toward the inside of the brush pedestal portion.

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