JP2021090744A - Toothbrush and toothbrush manufacturing method - Google Patents

Abstract

To provide a toothbrush capable of removing moisture to be likely stored in bristles on a rear surface side of a head part and keeping cleanliness, and also to provide a manufacturing method of the toothbrush.SOLUTION: A toothbrush 1 includes: bristles 4a; and a head part 2 where bristle bundles 4 obtained by binding a plurality of bristles are implanted. The head part has an implantation surface 2a, and implantation holes 3 are formed in the implantation surface. The bristle bundles are double-folded and implanted in the implantation holes by allowing folded parts being double-folded parts to be leading parts in a double-folded state. The implantation holes penetrate a rear surface on the opposite side of the implantation surface in the head part. The folded parts of the bristle bundles are exposed in openings on a rear surface side.SELECTED DRAWING: Figure 1

Description

The present invention relates to a toothbrush and a method for manufacturing a toothbrush, and more particularly to a method for manufacturing a toothbrush including a toothbrush preparation step of preparing a toothbrush having a head portion having a bristling hole penetrating the head portion and a toothbrush having a head portion having a penetrating blistering hole.

Conventionally, a brush and a head portion for implanting a hair bundle in which a plurality of the brushes are bundled are provided, and the head portion has a flocking surface and a flocking hole is formed in the flocking surface, and the hair bundle is folded in two. Then, there is a toothbrush that is planted in the flocked hole with the folded portion, which is the portion that is folded in two, at the head in the state of being folded in two (Patent Document 1).

In a conventional toothbrush, the bristles are folded in two in a U shape, and the flat line sandwiched between them is driven into the bristles to implant the bristles in which the plurality of brushes are bundled into the head portion. Can be set up.

The flat line is a thin quadrangular plate made of metal or the like, and is inserted from the entrance of the hair follicle hole, and the edges of the two opposite sides thereof are two in the axial direction on the inner peripheral surface in the hair follicle hole. Proceed to the middle of the hair follicle hole so as to draw a groove of the muscle. However, since the groove of the two muscles is narrow, even if the flat line tries to return the hair follicle hole in the opposite direction, friction in the axial direction of the hair follicle hole between the edge of the two sides and the groove. Force is generated. As a result, the brush maintains the planted state without being pulled out from the pores.

Further, since the head portion has a certain thickness, it is possible to make the hair-implanted hole having a depth corresponding to the thickness, and by securing the length of the groove, necessary friction is generated. Can be done.

As a result, the conventional toothbrush can reliably fix the brush to the head portion while adopting a simple assembling method in which the flat line and the hair bundle are driven into the bristles.

Japanese Unexamined Patent Publication No. 2016-63912

In a conventional toothbrush, the flocked holes have a bottom surface, so that the flocked holes are closed on the back surface of the head portion opposite to the flocked surface. Due to such a configuration, the brush is not exposed on the back side of the head portion.

On the other hand, by using a toothbrush for cleaning the oral cavity such as teeth and gums, water such as saliva of the user and chemical solution at the time of cleaning may be accumulated at the bottom of the hair follicle hole through the brush. .. In addition, running water for cleaning the toothbrush, washing water, and other water may accumulate. Since the hair follicles are fitted in the hair follicles, it is difficult for these water follicles to flow back through the hair follicles and be discharged. Further, since the brush on the bottom side is contained inside the closed pores, it is not easy to dry with a gas such as air or gas, and a water absorbing material such as cloth, cotton, or paper is used. It is impossible to wipe.

As a result, various germs easily propagate due to the accumulation of the above-mentioned water, and the toothbrush cannot be kept clean.

In view of such a problem, an object of the present invention is to provide a toothbrush that can remove water that tends to accumulate on the brush on the back side of the head portion and keep the toothbrush clean, and to provide a method for manufacturing the toothbrush.

(1) The present invention includes a brush and a head portion for flocking a hair bundle in which a plurality of the bristles are bundled, and the head portion has a flocking surface and a flocking hole is formed in the flocking surface. It is a toothbrush that is folded in two and is planted in the flocking hole with the folded portion, which is the part that is folded in two, at the head, and the flocking hole is the head portion of the head portion. The hair follicle penetrates the back surface opposite to the flocked surface, and the hair follicle provides a tooth brush characterized in that the folded portion is exposed at the opening on the back surface side.

That is, in the toothbrush of the present invention, since the hair bundle exposes the folded portion at the opening on the back side, the toothbrush is used for cleaning the oral cavity, and when cleaning, the exposed hair bundle is covered with cloth or cotton. By applying a water absorbing material such as paper, water such as saliva, chemicals, running water, and washing water can be wiped off. By removing the water in this way, the toothbrush can be kept clean.

Further, when the hair bundle comes into contact with the inner wall of the flocked hole, the folded portion where the hair bundle makes a U-turn does not contact the inner wall, whereas the hair bundle is continuous with the flocked surface side of the folded portion. The straight portion, which is a bundle of substantially columnar columns, is in contact with the inner wall. Even if the hair follicle attempts to exit the hair follicle in the opposite direction due to an external force, a frictional force is generated between the hair follicle and the inner wall in the axial direction of the hair follicle at this straight portion, and the hair follicle is generated. Try to stay.

Therefore, since the toothbrush of the present invention is configured to expose the folded-back portion on the back surface side, the area of the straight portion in contact with the inner wall is larger than that of the toothbrush not exposed. Further, even if the plate thickness of the head portion is made smaller, the frictional force is large and the hair bundle can surely stay at the planted position. Then, by staying at the position where the hair bundle is planted, the water absorbing material can be applied to the exposed hair bundle forever, and the toothbrush can be kept clean. Moreover, it is possible to reduce the brush from coming off from the follicles and to use the toothbrush for a long time.

By the way, it is known that by reducing the plate thickness of the head portion, the toothbrush can reach the back teeth more easily and the oral cavity can be easily cleaned. Therefore, the toothbrush of the present invention makes it easy to clean the oral cavity and can be used for a long time.

(2) Further, it has a flat line to be driven into the hair follicle hole, and the hair follicle may be folded in two by the flat line and pushed into the hair follicle hole.

That is, the flat line is inserted from the entrance of the hair follicle hole, and the edge of the two opposite sides draws a groove of two lines in the axial direction on the inner peripheral surface in the hair follicle hole. Proceed through the hair follicles. However, since the groove of the two muscles is shallow and the width of the groove is narrow, even if the flat line tries to return the hair follicle hole in the opposite direction, the groove is between the edge of the two sides and the groove. A frictional force is generated in the axial direction of the hair follicle hole. As a result, the brush maintains the planted state without being pulled out from the pores.

At this time, for example, in two types of head portions having the same plate thickness, when the folded portion is not exposed in one head portion and the folded portion is exposed in the other head portion, the other head portion is exposed. The head portion can fold the hair bundle in two at a deeper position, and the depth of the other head portion is the same as the depth at which the flat wire can be inserted into the one head portion. Is bigger. As described above, the toothbrush of the present invention is configured to expose the folded-back portion at the head portion, so that the flat line can be pushed deeper and between the edge of the two sides and the groove. Friction is large.

As described above, since these frictions can be made relatively large, the toothbrush of the present invention can generate a required amount of friction even if the plate thickness of the head portion is made smaller by that amount. it can.

By reducing the plate thickness of the head portion, the toothbrush can reach the back teeth more easily and the oral cavity can be easily cleaned. Therefore, the toothbrush of the present invention makes it easy to clean the oral cavity and can be used for a long time.

(3) Further, the inner space of the flocked hole is formed in a substantially prismatic shape, and in the flat line, the lower end of the flat line, which is one side of the back surface side, is a virtual pillar-shaped end surface on the back surface side. It may be arranged so as to be located on the flocked surface side of the flocked hole virtual bottom surface.

That is, since one side of the flat line is configured to be located on the flocked surface side of the flocked hole virtual bottom surface, the flat line does not protrude from the back surface side of the head portion with respect to the flocked hole virtual bottom surface. Therefore, it is possible to prevent an accident in which the flat wire protrudes from the head portion and damages the oral cavity of the user.

In this way, the toothbrush of the present invention can be used cleanly for a long time while preventing injuries in the oral cavity due to flat lines.

(4) Further, the inner space of the hair follicle hole is formed in a substantially prismatic shape, and in the flat line, the lower end of the flat line, which is one side of the back surface side, is a virtual pillar-shaped end surface on the back surface side. It may be arranged so as to be inscribed in the virtual bottom surface of the hair follicle hole.

That is, since the flat line is configured to be inscribed in the virtual bottom surface of the hair follicle hole, the flat line does not protrude from the back surface side of the head portion with respect to the virtual bottom surface of the hair follicle hole. Therefore, it is possible to prevent an accident in which the flat wire protrudes from the head portion and damages the oral cavity of the user.

At the same time, since it is inscribed in the virtual bottom surface of the hair follicle hole, the flat line can be arranged at the deepest position of the hair follicle hole. Therefore, even when the friction between the flat line and the groove is large, the straight portion is long, and the hair bundle is more strongly adhered to the inner wall, the plate thickness of the head portion is small. The tufts can more reliably stay in the planted position and will not come off.

In this way, the toothbrush of the present invention can be used cleanly for a long time while preventing injuries in the oral cavity due to flat lines.

(5) Further, the plate thickness of the head portion may be formed in a range of 1.5 mm or more and less than 4.0 mm.

In the toothbrush of the present invention, even when the plate thickness of the head portion is made small, the hair bundle stays at the position where the hair bundle is surely planted.

Conventionally, the plate thickness of the head portion of a thin toothbrush is said to be about 2.5 mm. By the way, regarding toothbrushes, according to the explanation of "Toothbrush JIS S 3016-1995" revised by the Japanese Industrial Standards Committee (currently the Japanese Industrial Standards Committee) on March 1, 1995, June 1, 1990. Based on the resolution of the Japanese Industrial Standards Committee Standards Committee, it is stipulated that the hair-stopping strength should be "maximum tensile strength of 8N or more". Therefore, in the case of the toothbrush of the present invention, the inventor has shown that even if the plate thickness of the head portion is as thin as 1.5 mm, the bristling strength is 15 N or more, which is larger than the above-mentioned specified value of 8 N. Found to show a value. Further, it has been found that even when the plate thickness of the head portion is 1.5 mm or more and less than 4.0 mm, the value of 15 N or more is exhibited. Further, also in the same experiment, even when the plate thickness of the head portion is 4.0 mm or more and 5.0 mm or less, the hair-fixing strength is reduced when the hair-implanted holes have a small diameter. However, it was found that it still shows a value of 15 N or more as described above.

As described above, in the toothbrush of the present invention, the plate thickness of the head portion can be set in the range of 1.5 mm or more and 5.0 mm or less, and the plate thickness is also 1.5 mm or more and the plate thickness is 1.5 mm or less. By being formed in a range of less than 4.0 mm, it is possible to sufficiently have a more desirable bristling strength as a toothbrush.

(6) Further, the flocked hole may have a reduced diameter portion whose inner diameter is smaller than the opening diameter on the flocked surface.

That is, at the time of flocking, the hair follicle is hindered by the reduced diameter portion of the flocked hole and is not unnecessarily pushed to the back side. Therefore, the toothbrush of the present invention can be easily manufactured by implanting the bristles to a predetermined depth. In addition, the toothbrush can be used for a long time because the bristles do not come off to the back surface side even during use and the brush does not come off from the bristles.

(7) Further, the reduced diameter portion may coincide with the virtual bottom surface of the reduced diameter portion, which is the virtual back end surface of the inner space thereof, and the virtual bottom surface of the hair follicle hole.

That is, since the virtual bottom surface of the reduced diameter portion and the virtual bottom surface of the hair follicle hole coincide with each other, the reduced diameter portion is provided unevenly on the back surface side of the hair follicle hole. Since the pushing depth of the hair follicle is regulated by the reduced diameter portion, the hair bundle is pushed deeper than when the reduced diameter portion is provided near the flocked surface, and the straight portion is formed. The area in contact with the inner wall of the pores is large. Therefore, the frictional force generated between the straight portion and the inner wall is large, and there is little possibility that the hair bundle will come off from the flocked surface side.

Further, since the flat wire can be inserted deeper, the frictional force generated between the flat wire and the groove in the flocked hole is large, and the flat wire that suppresses the hair follicle returns to the flocked surface side. It is suppressed that it will be lost. Even with this, there is little possibility that the hair bundle will come off from the flocked surface side.

(8) Further, the flat line may be arranged so that the lower end of the flat line circumscribes the virtual upper surface of the reduced diameter portion, which is the virtual end surface on the flocked surface side of the inner space of the reduced diameter portion.

That is, since the flat wire circumscribes the virtual upper surface of the reduced diameter portion, it is not further inserted into the reduced diameter portion. Therefore, it is not necessary to apply a larger pressure to fit the flat wire into the reduced diameter portion whose inner diameter is smaller than the opening diameter on the flocked surface, and the toothbrush of the present invention can be easily manufactured.

(9) Further, the inner space of the hair follicle hole is formed in a substantially prismatic shape, and the hair follicle is formed on the virtual bottom surface of the hair follicle hole whose folded portion is the virtual pillar-shaped virtual back surface side end surface. It may be inscribed.

That is, since the folded portion of the hair follicle is inscribed in the virtual bottom surface of the hair-implanted hole, the hair follicle does not protrude further to the back side. Therefore, even if the hair bundle is planted in a state where the back side of the head portion is in contact with a flat surface such as a work table, the toothbrush of the present invention has a protruding portion as described above with the flat surface. Does not interfere. In this way, the toothbrush can be easily manufactured.

(10) In the present invention, a preparatory step including a toothbrush preparation step, which is a step of preparing a toothbrush having a head portion having a penetrating bristles, and a bristles bundled with a plurality of brushes are drawn with a flat line. The hair follicle in the folded state and the flat line are both folded in half, and the folded portion is inserted from one opening of the hair-implanted hole at the beginning of the folded portion, which is the folded portion, and the folded portion is inserted. The present invention provides a method for manufacturing a tooth brush, which comprises a planting step, which is a step of pushing the hair in the other opening of the hair-implanted hole until it is exposed.

That is, according to the method for producing a toothbrush of the present invention, the toothbrush is used for cleaning the oral cavity because the hair bundle is exposed at the other opening, and when cleaning, the exposed hair bundle is covered with cloth or cotton. By applying a water absorbing material such as paper, water such as saliva, chemicals, running water, and washing water can be wiped off. By removing the water in this way, the toothbrush can be kept clean.

(11) Further, the planting step includes an auxiliary tool preparation step which is a step of preparing a flat wire pushing auxiliary tool provided with a concave recessed portion on a flat surface before the planting step, and the planting step includes the other opening. May include a step of mounting the flat wire fitting assisting tool on the other opening side of the head portion so that the recessed portions overlap with each other.

That is, in the method for manufacturing a toothbrush of the present invention, since the recessed portion of the flat wire pushing assist tool and the other opening of the hair-implanted hole overlap, the folded portion protruding from the other opening can be inserted into the recessed portion. As a result, when the toothbrush is placed on a flat surface of a work table, a device, or the like via the flat line pushing assisting tool and the hair bundle and the flat line are pushed into the hair-implanted hole, such a work table or the like is used. It does not interfere with the protrusion of the folded-back portion and can be efficiently manufactured.

(12) Further, the planting step may include a step of inserting the flat wire until the folded portion abuts on the bottom of the recessed portion.

That is, since the folded-back portion of the hair bundle abuts on the bottom of the recessed portion of the flat wire pushing aid, the length of the folded-back portion protruding from the other opening can be regulated by the depth of the recessed portion. .. As a result, the protruding length is set to a length sufficient for wiping off water such as saliva, chemicals, running water, and washing water with a water absorbing material such as cloth, cotton, and paper, and work, use, storage, and so on. It is possible to set it to something that is not too long for aesthetic purposes. Moreover, the friction between the flat line and the groove is large, the straight portion is long, and the hair bundle is more strongly adhered to the inner wall, so that the hair bundle can be formed even when the plate thickness of the head portion is small. It can stay in the planted position more reliably and will not come off. In this way, it is possible to produce a toothbrush that can remove the water and keep it clean and can be used for a long time.

(13) Further, in the toothbrush preparation step, a toothbrush having a reduced diameter portion whose inner diameter is smaller than the opening diameter of the one opening is prepared as the toothbrush, and the folded portion is formed in the planting step. It may be pushed so as to come into contact with the reduced diameter portion.

That is, at the time of flocking, since the folded portion is pushed so as to come into contact with the reduced diameter portion, the hair bundle is hindered by the reduced diameter portion and is not pushed further to the other opening side. Therefore, according to the method for manufacturing a toothbrush of the present invention, the bristles are planted to a predetermined depth, and the toothbrush can be easily manufactured. In addition, the toothbrush can be used for a long time because the bristles do not come off to the back surface side even during use and the brush does not come off from the bristles.

In this way, it is possible to provide a toothbrush that can be kept clean by removing water that tends to accumulate on the brush on the back side of the head portion, and a method for manufacturing the toothbrush. Further, by reducing the plate thickness of the head portion, it is possible to provide a toothbrush that makes it easy to clean the oral cavity and a method for manufacturing the toothbrush.

(A) The figure of the toothbrush 1 which concerns on 1st Embodiment of this invention is shown. (B) Shows a view of the toothbrush 1 of FIG. 1 (a) viewed from the left side. (A) Shows the front partial sectional view of the head part 2 which concerns on 1st Embodiment of this invention. (B) Similarly, a cross-sectional view of the right side surface of the head portion 2 is shown. The perspective view of the toothbrush 1 which concerns on 1st Embodiment of this invention is shown. An explanatory diagram showing the arrangement of the hair follicle holes 3 according to the first embodiment of the present invention is shown. The flow chart which shows the manufacturing method S1000 of the toothbrush which concerns on 1st Embodiment of this invention is shown. It shows the front partial sectional view of the flat wire pushing auxiliary tool 8 which concerns on 1st Embodiment of this invention. An explanatory diagram showing a state in which the flat wire pushing assisting tool 8 according to the first embodiment of the present invention is attached to the head portion 2 is shown. (A) Represents a front partial cross-sectional view of the head portion 102 according to the second embodiment of the present invention. (B) Similarly, a cross-sectional view of the right side surface of the head portion 102 is shown. (A) Shows a schematic view of the hair follicle hole columnar space C of the hair follicle hole 103 according to the second embodiment of the present invention. (B) Similarly, a schematic diagram of a reduced diameter columnar space E is shown. The flow chart which shows the manufacturing method S1100 of the toothbrush which concerns on 2nd Embodiment of this invention is shown. (A) Represents a front partial cross-sectional view of the head portion 112 according to the third embodiment of the present invention. (B) Similarly, a cross-sectional view of the right side surface of the head portion 112 is shown. The flow chart which shows the manufacturing method S1200 of the toothbrush which concerns on 3rd Embodiment of this invention is shown. (A) Shows the front partial sectional view of the head part 12 which concerns on 4th Embodiment of this invention. (B) Similarly, a cross-sectional view of the right side surface of the head portion 12 is shown. An explanatory diagram showing a state in which the flat wire pushing assisting tool 8 according to the fourth embodiment of the present invention is attached to the head portion 12 is shown. A table showing the result of measuring the bristling strength of the toothbrush 11 according to the fourth embodiment of the present invention is shown. A graph showing the result of measuring the bristling strength of the toothbrush 11 according to the fourth embodiment of the present invention is shown. (A) Represents a front partial cross-sectional view of the head portion 22 according to the fifth embodiment of the present invention. (B) Similarly, a cross-sectional view of the right side surface of the head portion 22 is shown. The flow chart which shows the manufacturing method S2000 of the toothbrush which concerns on 5th Embodiment of this invention is shown. An explanatory diagram showing a state in which the flat wire pushing assisting tool 8 according to the fifth embodiment of the present invention is attached to the head portion 22 is shown.

[First Embodiment]
1 to 7 illustrate the first embodiment of the present invention. In the figure, 1 is a toothbrush.

The head portion 2 of the toothbrush 1 has a flocked surface 2a, and a plurality of flocked holes 3 which are round holes are formed in the flocked surface 2a. The hair follicles 3 are regularly arranged as shown in the example of FIG. 1 (a). As shown in FIGS. 2A and 2B, the flocking hole 3 penetrates from the flocking surface 2a to the back surface 2b, which is the surface opposite to the flocking surface 2a with respect to the head portion 2. FIG. 3 is a perspective view showing the toothbrush 1 in a state before the hair bundle 4 is transplanted as in FIG. 1A, and the toothbrush 1 is shown obliquely. The toothbrush 1 is formed of a synthetic resin such as saturated polyester (PET), polypropylene (PP), or polyacetal resin (POM).

A plurality of hair tresses 4 for cleaning the inside of the oral cavity M such as teeth and gums (not shown) are transplanted into each hair follicle hole 3, and each hair follicle 4 is brushed one by one aligned in the longitudinal direction thereof. 4a is bundled and formed. In FIG. 1 (b) when the toothbrush 1 of FIG. 1 (a) is viewed from the left side, only one bundle of hair bundles 4 is shown by a solid line for easy viewing, and a two-dot chain line with the remaining hair bundles 4 gathered. It is shown by (imaginary line). The user cleans the inside of the oral cavity M using the brush 4a on the flocked surface 2a side.

FIG. 4 is an explanatory view showing the arrangement of the hair follicle holes 3. The state in which the hair bundles 4 are gathered is shown by a two-dot chain line as in FIG. 1 (b).

Each hair follicle 4 is folded in two, and the folded portion 5 which is the folded portion is pushed into each hair follicle hole 3 at the head and planted. FIG. 2A is a front partial cross-sectional view of a state in which the hair follicle 4 is folded in half by the flat flat line 6 and pushed into the hair planting hole 3 as viewed from the plane direction of the flat surface of the flat line 6. is there. Further, FIG. 2B is a partial cross-sectional view of the right side surface of the head portion 2 viewed toward the flat right side surface of the flat line 6. The front partial cross-sectional view is a cross-sectional view including the cross section of the flat line 6, and the right side partial cross-sectional view is a cross-sectional view including the vertical cross section of the flat line 6. Hatching is omitted to make it easier to see the code, leader line, etc. Note that FIG. 1A shows a state before the planting of each hair bundle 4 and the driving of the flat line 6. Further, the description of the flat line 6 is omitted in FIGS. 1 (b) and 4.

The flat wire 6 is made of a material such as copper or brass, and has a hardness sufficient to be driven into the head portion 2 of the synthetic resin.

In FIG. 2A, arrows U, D, arrows L, and arrows R indicate an upper side (upward), a lower side (downward), a left side (leftward), and a right side (rightward), respectively. Further, in FIG. 2B, in addition to the above arrows U and D, arrows F and B indicate the front side (forward facing) and the rear side (rear facing), respectively.

Each hair bundle 4 includes a straight portion 7 which is a bundle of substantially columnar columns continuous on the flocked surface 2a side of the folded portion 5. Here, as shown in FIG. 2A, the straight portion 7 refers to a range from the upper end of the folded portion 5 to the flocked surface 2a in the vertical direction. Although not shown, the plurality of brushes 4a constituting each hair bundle 4 are arranged in a curved shape surrounding the lower end of the flat line 6a, which is the lower end of the front view flat line 6, at the folded-back portion 5. The straight portion 7 is arranged in a substantially straight line in the vertical direction.

At this time, since the hair follicle 4 is pushed into the hair follicle hole 3, the straight portion 7 comes into close contact with the hair follicle hole wall 3a which is the inner wall of the hair follicle hole 3.

A part of the folded-back portion 5 protrudes from the head portion 2 and is exposed at the opening on the back surface 2b side. The lower end of the folded-back portion 5 is located below the back surface 2b, and the upper end of the folded-back portion 5 is located above the back surface 2b.

The flat line 6 is arranged so that the lower end 6a of the flat line is located above the back surface 2b. That is, the inner space of the flocked hole 3 which is a round hole is formed in a substantially columnar flocked hole columnar space C, and this flocked hole columnar space C forms a flocked hole virtual bottom surface Cb which is a virtual back surface 2b side end surface. The flat line 6 is arranged so that the lower end 6a of the flat line is located closer to the flocking surface 2a than the virtual bottom surface Cb of the flocking hole.

The flat line 6 is driven downward and is inserted from the entrance of the hair follicle hole 3, and the end edges 6b and 6b of the two sides facing each other in the front-rear direction are two in the axial direction on the inner peripheral surface in the hair follicle hole 3. Proceed to the middle of the hair follicle hole 3 so as to draw the muscle grooves 2c and 2c. However, since the grooves 2c and 2c of the two lines are shallow and the widths of the grooves 2c and 2c are narrow, even if the flat line 6 tries to return the hair follicle hole 3 upward, the edges 6b and 6b of the two sides and the groove A frictional force is generated between the 2c and the 2c in the axial direction of the hair follicle hole 3. As a result, each brush 4a maintains the planted state without being pulled out from the hair-implanted hole 3.

As described above, since the toothbrush 1 exposes the hair bundle 4 on the back surface 2b side, the toothbrush 1 is used for cleaning the oral cavity M, and when cleaning, the exposed hair bundle 4 is covered with a cloth. By applying a water absorbing material such as cotton or paper, water such as saliva, chemicals, running water, and washing water can be wiped off. By removing the water in this way, the toothbrush 1 can be kept clean.

Further, when the hair follicle 4 comes into contact with the hair follicle wall 3a, the folded-back portion 5 does not come into contact with the hair follicle wall 3a, whereas the hair follicle 4 comes into contact with the hair follicle wall 3a at the straight portion 7. Even when the hair follicle 4 tries to move out of the hair follicle 3 upward by an external force, a frictional force is generated between the hair follicle 4 in the axial direction of the hair follicle 3 and the hair follicle wall 3a in the straight portion 7, and the hair follicle wall 3a is generated. 4 tries to stay.

Since the folded portion 5 of the toothbrush 1 of the present invention is exposed from the head portion 2 on the back surface 2b side, the area of the straight portion 7 in contact with the pore wall 3a is larger than that of the unexposed toothbrush. .. Therefore, the frictional force is relatively large, and the hair bundle 4 can surely stay at the planted position.

Moreover, the depth at which the flat line 6 can be inserted is larger than that of an unexposed toothbrush. Therefore, the flat line 6 can be pushed deeper, and the friction between the two edge edges 6b and 6b and the respective grooves 2c and 2c is large.

Further, since the lower end 6a of the flat line is configured to be located closer to the flocking surface 2a than the flocking hole virtual bottom surface Cb, the flat line 6 does not protrude downward from the flocking hole virtual bottom surface Cb. Therefore, it is possible to prevent an accident in which the flat wire 6 protrudes from the head portion 2 and damages the inside of the oral cavity M of the user.

[Production method]
In FIG. 5, S1000 illustrates a method of manufacturing a toothbrush according to the first embodiment of the present invention.

The manufacturing method S1000 of the toothbrush 1 of the present invention includes these steps in the order of the preparation step S1010 and the planting step S1020.

The preparation step S1010 includes a toothbrush preparation step S1011 and an auxiliary tool preparation step S1012. In the toothbrush preparation step S1011, the toothbrush 1 is prepared, and the head portion 2 of the toothbrush 1 is provided with a follicle hole 3. In the toothbrush 1, the head portion 2 and the handle portion continuous with the head portion 2 are molded by, for example, injection molding.

On the other hand, in the auxiliary tool preparation step S1012, a flat wire pushing auxiliary tool 8 having a plurality of concave recessed portions 9 is prepared in the flat head portion receiving surface 8a as shown in the front partial cross-sectional end view of FIG. .. In the flat line pushing aid 8, each recess 9 opens upward in the figure.

Each recess 9 has a substantially circular shape when viewed from the head receiving surface 8a, and the diameter of the recess edge 9a, which is the boundary with the flat surface of the head receiving surface 8a, coincides with the diameter of each hair follicle hole 3. The arrangement of the recessed portions 9 in the flat line pushing assist tool 8 coincides with the arrangement of the hair follicles 3 in the head portion 2 in the left-right direction and the front-rear direction. The flat wire pushing aid 8 is made of a material harder than the flat wire 6, for example, when the flat wire 6 is made of brass, it is made of a metal harder than brass.

The planting step S1020 includes these steps in the order of the auxiliary tool mounting step S1021, the pushing step S1022, and the auxiliary tool removing step S1023.

In the assisting tool mounting step S1021, the flat wire pushing assisting tool 8 is mounted on the head portion 2 so that the back surface 2b of the head portion 2 and the head portion receiving surface 8a of the flat wire pushing assisting tool 8 come into contact with each other. At this time, the back surface 2b and the head portion receiving surface 8a are arranged so that the back surface side opening edge 3b, which is the boundary between the flat surface of the back surface 2b and the back surface 2b side opening of each hair follicle hole 3, and the recessed edge 9a overlap each other. Will be done. As a result, each hair follicle hole 3 and each corresponding recessed portion 9 communicate with each other.

In the pushing step S1022, the hair follicle 4 in which a plurality of brushes 4a are bundled is folded in half by hitting the flat line 6, and both the hair follicle 4 and the flat line 6 in the folded state are folded in half. The folded-back portion 5 is inserted from the flocking surface 2a side opening of the flocking hole 3 at the beginning, and the folded-back portion 5 is pushed through the back surface 2b side opening of the flocking hole 3 until it protrudes from the head portion 2.

At this time, the flat line 6 is driven downward, and the edges 6b and 6b on the two sides advance to the middle of the hair follicle hole 3 so as to draw the grooves 2c and 2c of the two muscles. Further, FIG. 7 shows a state in which the flat line pushing assist tool 8 is attached to the head portion 2, and the tip of the folded-back portion 5 advances to the inside of the recessed portion 9 as shown in FIG. 7.

In the auxiliary tool removing step S1023, the flat wire pushing auxiliary tool 8 is removed from the head portion 2 so that the head portion receiving surface 8a is separated from the back surface 2b. Through the auxiliary tool removing step S1023, the toothbrush 1 in which the brush 4a is planted so as to expose the hair bundle 4 from the head portion 2 on the back surface 2b side is completed.

As described above, the toothbrush 1 cleans the inside of the oral cavity M by using the brush 4a on the flocked surface 2a side, and the bristles 4 protrude from the head portion 2 on the back surface 2b side and are exposed. By applying a water absorbing material such as cloth, cotton, or paper to the bundle 4, water such as saliva, chemicals, running water, and washing water can be wiped off. By removing the water in this way, the toothbrush 1 can be kept clean.

Further, since the recessed portion 9 of the flat wire pushing aid 8 and the opening on the back surface 2b side of the hair-implanted hole 3 overlap and the hair-implanted hole 3 and the recessed portion 9 communicate with each other, the folded-back portion 5 protruding from the opening on the back surface 2b side is recessed. It can be inserted into the portion 9. As a result, when the toothbrush 1 is placed on a flat surface of a work table, a device, or the like via the flat wire pushing assist tool 8 and the hair follicle 4 and the flat wire 6 are pushed into the hair planting hole 3, such a work table or the like. Does not interfere with the protrusion of the folded-back portion 5, and the toothbrush 1 can be efficiently manufactured.

[Second Embodiment]
8 to 10 illustrate a second embodiment of the present invention. In the figure, 101 is a toothbrush.

The head portion 102 of the toothbrush 101 has a flocking surface 102a, and a plurality of flocking holes 103, which are round holes, are formed in the flocking surface 102a. As shown in FIGS. 8A and 8B, the flocking hole 103 penetrates from the flocking surface 102a to the back surface 102b, which is the surface opposite to the flocking surface 102a with respect to the head portion 102.

The flocked hole 103 has a reduced diameter portion 103c whose inner diameter is smaller than the opening diameter on the flocked surface 102a. The reduced diameter portion 103c forms an annular step at the upper end, and forms a step edge 103d which is an edge inside the step. The step edge 103d draws a circle in a plan view. Then, the inner space occupied by the reduced diameter portion 103c forms a substantially cylindrical reduced diameter portion columnar space E between the step edge 103d and the back side opening edge 103b.

9 (a) and 9 (b) show the hair follicle hole 103 as a whole, and schematically represent a front sectional view of each of the hair follicle hole columnar space C and the reduced diameter portion columnar space E. FIG. 9 (a) shows the hair follicle hole columnar space C, and the shaded portion of FIG. 9 (b) shows the reduced diameter portion columnar space E. Here, the hair follicle hole columnar space C has a hair follicle hole virtual bottom surface Cb which is a virtual back surface 102b side end surface. The reduced-diameter columnar space E has a reduced-diameter virtual upper surface Ea which is a virtual flocked surface 102a side end surface and a reduced-diameter virtual bottom surface Eb which is a virtual back surface 102b side end surface.

Since the diameter-reduced portion 103c of each of these virtual bottom surfaces Cb and Eb is provided unevenly toward the back surface 102b of the hair-implanted hole 103, they are all located at the lowermost part of the hair-implanted hole 103. In other words, in the reduced diameter portion 103c located closer to the back surface 102b, the curly pore columnar space C and the reduced diameter portion columnar space E coincide with each other, so that the pore virtual bottom surface Cb and the reduced diameter portion virtual bottom surface Eb coincide with each other. To do.

As shown in FIGS. 8A and 8B, the flat line 106 is arranged so that the lower end 106a of the flat line is located closer to the flocking surface 102a than the flocked hole virtual bottom surface Cb. Further, the flat wire 106 is arranged so that the lower end 106a of the flat wire circumscribes the virtual upper surface Ea of the reduced diameter portion and is in contact with the columnar space E of the reduced diameter portion downward. Then, the pushed-in folded-back portion 105 comes into contact with the step edge 103d, and the planting of the hair bundle 104 is completed.

Other configurations are common to the first embodiment.

With such a configuration, when the toothbrush 101 is transplanted, the folded-back portion 105 of the hair bundle 104 is hindered by the stepped edge 103d of the reduced diameter portion 103c, and is not unnecessarily pushed toward the back surface 102b. Therefore, the hair bundle 104 is planted to a predetermined depth and can be easily manufactured. Further, since the hair bundle 104 does not come off to the back surface 102b side even during use and the brush 104a does not come off from the hair-implanted hole 103, this toothbrush can be used for a long time.

Further, since the reduced diameter portion 103c is provided unevenly on the back surface 102b side of the flocked hole 103 and the pushing depth of the hair bundle 104 is regulated by the reduced diameter portion 103c, the hair bundle 104 is a reduced diameter portion. The 103c is pushed deeper than when the 103c is provided closer to the flocked surface 102a. Therefore, the area of the straight portion 107 that is in close contact with the hair follicles hole wall 103a is large, and the frictional force generated between the straight portion 107 and the follicles hole wall 103a is large. As a result, the hair bundle 104 is less likely to come off from the flocked surface 102a side.

Further, since the flat line 106 can be deeply inserted, the frictional force generated between the flat line 106 and the grooves 102c and 102c in the flocking hole 103 is large, and the flat line 106 that suppresses the hair bundle 104 is the flocking surface 102a. It is possible to prevent it from returning to the side. Even with this, there is little possibility that the hair bundle 104 will come off from the flocked surface 102a side.

Since the flat wire 106 circumscribes the virtual upper surface Ea of the reduced diameter portion, it does not enter the reduced diameter portion 103c any more and is inserted. Therefore, it is not necessary to apply a larger pressure to fit the flat wire 106 into the reduced diameter portion 103c, and the toothbrush 101 can be easily manufactured. On the other hand, the flat wire 106 is pushed deeper than the case where the flat wire 106 does not circumscribe the virtual upper surface Ea of the reduced diameter portion and stays above the virtual upper surface Ea of the reduced diameter portion. From this as well, there is little possibility that the hair bundle 104 will come off from the flocked surface 102a side.

[Production method]
In FIG. 10, S1100 illustrates a method of manufacturing a toothbrush according to a second embodiment of the present invention.

The manufacturing method S1100 of the toothbrush 101 of the present invention includes these steps in the order of the preparation step S1110 and the planting step S1120.

The preparation step S1110 includes a toothbrush preparation step S1111 and an auxiliary tool preparation step S1112. In the toothbrush preparation step S1111, the toothbrush 101 is prepared, and the head portion 102 of the toothbrush 101 is provided with a follicle hole 103. In the toothbrush 101, the head portion 102 and the handle portion continuous with the head portion 102 are molded by, for example, injection molding.

At this time, the flocked hole 103 has a reduced diameter portion 103c whose inner diameter is smaller than the opening diameter on the flocked surface 102a. The reduced diameter portion 103c forms an annular step at the upper end, and forms a step edge 103d which is an edge inside the step. The step edge 103d draws a circle in a plan view.

Next, the planting step S1120 includes these steps in the order of the auxiliary tool mounting step S1121, the pushing step S1122, and the auxiliary tool removing step S1123.

In the pushing step S1122, the hair bundle 104 in which a plurality of brushes 104a are bundled is folded in half by hitting the flat line 106, and both the hair bundle 104 in the folded state and the flat line 106 are folded in half. The folded-back portion 105 is inserted from the flocking surface 102a side opening of the flocking hole 103 at the beginning, and the folded-back portion 105 is pushed through the back surface 102b side opening of the flocking hole 103 until it protrudes from the head portion 102.

The pushing step S1122 includes a folded-back portion contact step S1122a. In the push-back portion contact step S1122a, as a result of advancing through the hair-planting hole 103, the folded-back portion 105 abuts on the step edge 103d, and the hair bundle 104 is disturbed by the step edge 103d and the planting is completed without further progress. ..

Other steps and steps are common to the method for manufacturing a toothbrush in the first embodiment.

By such a manufacturing method, when the hair is transplanted, the folded-back portion 105 is pushed so as to be in contact with the reduced diameter portion 103c, so that the hair bundle 104 is hindered by the reduced diameter portion 103c and is not pushed further toward the back surface 102b. .. Therefore, the hair bundle 104 is planted to a predetermined depth, and the toothbrush 101 can be easily manufactured. Further, the toothbrush 101 can be used for a long time because the hair bundle 104 does not come off to the back surface 102b side even during use and the brush 104a does not come off from the bristles hole 103.

[Third Embodiment]
11 and 12 illustrate a third embodiment of the present invention. In the figure, 111 is a toothbrush.

The head portion 112 of the toothbrush 111 has a flocked surface 112a, and a plurality of flocked holes 113, which are round holes, are formed in the flocked surface 112a. As shown in FIGS. 11A and 11B, the flocking hole 113 penetrates from the flocking surface 112a to the back surface 112b, which is the surface opposite to the flocking surface 112a with respect to the head portion 112.

The flocked hole 113 has a reduced diameter portion 113c whose inner diameter is smaller than the opening diameter on the flocked surface 112a. The reduced diameter portion 113c forms an annular step at the upper end, and forms a step edge 113d which is an edge inside the step. The step edge 113d draws a circle in a plan view. Then, the inner space occupied by the reduced diameter portion 113c forms a substantially cylindrical reduced diameter portion columnar space E between the step edge 113d and the back side opening edge 113b. The reduced-diameter virtual bottom surface Eb, which is the virtual back surface 112b side end surface of the reduced-diameter columnar space E, coincides with the flocked hole virtual bottom surface Cb, which is the virtual back surface 112b side end surface of the reduced-diameter columnar space C.

In the hair follicle 114, the folded-back portion 115 pushed into the hair follicle columnar space C is inscribed in the virtual bottom surface Cb of the hair follicle hole. As described above, since the toothbrush 111 exposes the hair bundle 114 on the back surface 112b side, the toothbrush 111 is used for cleaning the oral cavity M, and when cleaning, the exposed hair bundle 114 is covered with cloth or cotton. By applying a water absorbing material such as paper, water such as saliva, chemicals, running water, and washing water can be wiped off. By removing the water in this way, the toothbrush 111 can be kept clean.

Other configurations are common to the second embodiment.

With such a configuration, in the toothbrush 111, the folded-back portion 115 is inscribed in the virtual bottom surface Cb of the hair-implanted hole, and the hair follicle 114 does not protrude further toward the back surface 112b. Therefore, even if the hair bundle 114 is planted in a state where the back surface 112b side of the head portion 112 is in contact with a flat surface such as a work table, the protruding portion of the toothbrush 111 does not interfere with the flat surface. .. In this way, the toothbrush 111 can be easily manufactured.

[Production method]
In FIG. 12, S1200 illustrates a method of manufacturing a toothbrush according to a third embodiment of the present invention.

The manufacturing method S1200 of the toothbrush 111 of the present invention includes these steps in the order of the preparation step S1210 and the planting step S1220. The preparation step S1210 includes a toothbrush preparation step S1211. Further, the planting step S1220 includes a pushing step S1222. The pushing step 1222 includes a folded-back portion contact step S1222a. In the folded-back portion contact step S1222a, the folded-back portion 115 abuts on the step edge 113d and inscribes on the virtual bottom surface Cb of the hair follicle hole.

These steps and steps are common to the toothbrush manufacturing method of the second embodiment. Since the folded-back portion 115 of the toothbrush 111 in the present embodiment does not protrude from the back surface 112b side, the flat wire pushing assist tool 8 used in the second embodiment is not necessarily required. Therefore, the manufacturing method of the present embodiment does not necessarily require the auxiliary tool preparation step S1112, the auxiliary tool mounting step S1121, and the auxiliary tool removing step S1123 included in the manufacturing method of the second embodiment.

[Fourth Embodiment]
13 to 16 illustrate a fourth embodiment of the present invention. In the figure, 11 is a toothbrush.

The head portion 12 of the toothbrush 11 has a flocked surface 12a, and a plurality of flocked holes 13 which are round holes are formed in the flocked surface 12a. The flocking hole 13 penetrates from the flocking surface 12a to the back surface 12b as shown in FIGS. 13A and 13B. A plurality of hair tresses 14 are planted in each of the hair-implanted holes 13, and each hair follicle 14 is formed by bundling individual brushes 14a. Each hair follicle 14 is folded in two, and the folded portion 15 which is the two-folded portion is pushed into each hair follicle hole 13 at the head and planted. 13 (a) and 13 (b) are a front partial cross-sectional view and a right side partial cross-sectional view showing a state in which the hair follicle 14 is folded in two by a flat flat line 16 and pushed into the hair planting hole 13, respectively.

Each hair bundle 14 includes a straight portion 17 which is a bundle of substantially columnar columns continuous on the flocked surface 12a side of the folded portion 15. Since the hair follicle 14 is pushed into the hair follicle hole 13, the straight portion 17 comes into close contact with the hair follicle hole wall 13a, which is the inner wall of the hair follicle hole 13.

The folded-back portion 15 projects from the head portion 12 and is exposed at the opening on the back surface 12b side. The lower end of the folded-back portion 15 is located below the back surface 12b, and the upper end of the folded-back portion 15 coincides with the position of the back surface 12b in the vertical direction.

The flat line 16 is driven downward and advances until the edge 16b and 16b on the two sides approach the lower end of the hair follicle hole 13 so as to draw the grooves 12c and 12c of the two muscles. The flat line 16 is arranged so that the lower end 16a of the flat line is located above the back surface 12b. That is, the flat line 16 is arranged so that the lower end 16a of the flat line is located closer to the flocking surface 12a than the flocking hole virtual bottom surface Cb of the flocking hole columnar space C of the flocking hole 13.

The lower end of the straight portion 17 coincides with the position of the back surface 12b in the vertical direction. That is, the thickness of the head portion 12 and the height of the straight portion 17 match, and the entire hair-implanted hole wall 13a is in close contact with the straight portion 17.

FIG. 14 shows a state in which the flat line pushing assist tool 8 is attached to the head portion 12, and the folded-back portion 15 advances to the inside of the recessed portion 9 as shown in FIG.

Other configurations are common to the first embodiment.

In the toothbrush 11 of the present invention, the entire folded-back portion 15 protrudes from the head portion 12 on the back surface 12b side and is exposed, so that the straight portion 17 is in close contact with the entire hair-implanted hole wall 13a. Therefore, the area where the hair follicle 14 is in contact with the hair-implanted hole wall 13a is larger, the frictional force is large, and the hair follicle 14 can be reliably stayed at the planted position.

[Example]
FIG. 15 measures the hair-holding strength when the hair bundle 14 is pulled out from the hair-implanted hole 13 when the brush 14a is planted in the hair-implanted hole 13 using the flat line 16 as shown in FIG. The result is shown. The brush 14a used was made of nylon, had a thickness of 6 mil, and had a length of 33 mm. The toothbrush 11 has the diameters of the follicles holes 13 of 1.0 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm and 2.0 mm, respectively, and the head portion represented by the reference numeral t in FIG. Twelve plate thicknesses of 1.5 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm and 5.0 mm were prepared, respectively. For the hair follicles 13 of each diameter, the number of brushes 14a constituting each hair bundle 14 is the same for a total of 22 brushes 14a for 1.2 mm by folding back 11 brushes 14a for 1.0 mm. A total of 40 pieces, 52 pieces for 1.4 mm, 72 pieces for 1.6 mm, 90 pieces for 1.8 mm, and 114 pieces for 2.0 mm.

When planting the hair bundle 14, the flat wire pushing assist tool 8 was used according to the toothbrush manufacturing method S1000.

The bristling strength test was carried out by a tensile tester according to the explanation of "Toothbrush JIS S 3016-1995" described above. The pull-out speed in the strength test by the tensile tester was set to 20 mm / min.

In the table of FIG. 15, when the plate thickness (mm) of each head portion 12 indicated by each row and the diameter of each bristling hole (mm) indicated by each column, the above-mentioned number of brushes 14a are planted. The average value of the hair-holding strength (N) when the strength test is performed three times each is shown.

FIG. 16 shows each graph in the case of the diameter of each hair follicle hole 13 when the vertical axis shows the hair-holding strength (N) and the horizontal axis shows the plate thickness (mm) of the head portion 12. As shown by the numerical values in FIG. 15 and the graphs in FIG. 16, the hair-stopping strength in all cases where the plate thickness of the head portion 12 is 1.5 mm or more and 5.0 mm or less is 15.0 N or more. It was confirmed that the value was larger than the specified value of 8N based on the above-mentioned decision of the Japanese Industrial Standards Committee Standards Meeting dated June 1, 1990. Therefore, in the toothbrush 11 of the present invention, the plate thickness of the head portion 12 can be set to 1.5 mm or more and 5.0 mm or less.

On the other hand, in each of the above graphs, when the diameter of the hair-implanted hole 13 is 1.0 mm, the bristling strength peaks when the head portion 12 has a plate thickness of 4.0 mm, and when the plate thickness is 4.0 mm or more. It was found that the hair-holding strength decreased as the plate thickness increased. Further, it was found that the minimum limit size of the plate thickness of the head portion 12 is 1.5 mm in the processing of forming the hair follicle holes 13 having the above dimensions and driving the flat wire 16. As described above, when the hair bundle 14 is planted in the straight pore 13 having the above dimensions, it is more preferable that the plate thickness of the head portion 12 is formed in a range of 1.5 mm or more and less than 4.0 mm.

Therefore, the toothbrush 11 of the present invention can have a more desirable bristling strength as a toothbrush by forming the head portion 12 in a plate thickness of 1.5 mm or more and less than 4.0 mm.

Further, even if the plate thickness of the head portion 12 is 1.5 mm or more and is extremely thin such as in the range of less than 2.0 mm, the bristling strength is 15.0 N or more. Further, even if the plate thickness is as thin as 2.0 mm or more and less than 2.5 mm, the hair blocking strength is 25.0 N or more.

As described above, by reducing the plate thickness of the head portion 12, the toothbrush 11 can reach the back teeth more easily and the oral cavity can be easily cleaned. Therefore, the toothbrush 11 of the present invention makes it easy to clean the oral cavity, and the brush 14a is hard to come off and can be used for a long time.

[Fifth Embodiment]
17 to 19 illustrate a fifth embodiment of the present invention. In the figure, 21 is a toothbrush.

The head portion 22 of the toothbrush 21 has a flocked surface 22a, and a plurality of flocked holes 23, which are round holes, are formed in the flocked surface 22a. The flocking hole 23 penetrates from the flocking surface 22a to the back surface 22b as shown in FIGS. 17A and 17B. A plurality of hair tresses 24 are planted in each of the hair-implanted holes 23, and each hair follicle 24 is formed by bundling individual brushes 24a. Each hair follicle 24 is folded in two, and the folded portion 25, which is the two-folded portion, is pushed into each hair follicle hole 23 at the head and planted. 17 (a) and 17 (b) are a front partial cross-sectional view and a right side partial cross-sectional view showing a state in which the hair follicle 24 is folded in two by a flat flat line 26 and pushed into the hair planting hole 23, respectively.

Each hair bundle 24 includes a straight portion 27 which is a bundle of substantially columnar columns continuous to the flocked surface 22a side of the folded portion 25. Since the hair follicle 24 is pushed into the hair follicle hole 23, the straight portion 27 comes into close contact with the hair follicle hole wall 23a, which is the inner wall of the hair follicle hole 23.

The folded-back portion 25 projects from the head portion 22 and is exposed at the opening on the back surface 22b side. The lower end of the folded-back portion 25 is located below the back surface 22b, and the upper end of the folded-back portion 25 coincides with the position of the back surface 22b in the vertical direction.

The flat line 26 is driven downward so that the two edge edges 26b and 26b draw the grooves 22c and 22c of the two lines, and the flat line 26 advances until the lower end 26a of the flat line reaches the back surface 22b of the head portion 22. That is, the flat line 26 is arranged so that the lower end 26a of the flat line is inscribed in the virtual bottom surface Cb of the hair follicle hole possessed by the columnar space C of the hair follicle hole 23 and is in contact with the virtual bottom surface Cb of the hair follicle hole downward. To. Further, the lengths of the two grooves 22c and 22c match the thickness of the head portion 22.

The lower end of the straight portion 27 coincides with the position of the back surface 22b in the vertical direction. That is, the thickness of the head portion 22 and the height of the straight portion 27 match, and the entire hair-implanted hole wall 23a is in close contact with the straight portion 27.

Other configurations are common to the fourth embodiment.

In the toothbrush 11 of the present invention, since the flat line 26 is arranged at the lowermost side of the hair follicles 23, the hair follicles 24 are pressed outward from the radius at the deepest position of the hair follicles 23. Therefore, the hair follicle 24 comes into close contact with the hair-implanted hole wall 23a. This allows the hair bundle 24 to more reliably stay in the planted position. Further, the two grooves 22c and 22c are the longest, and the friction between the two edge edges 26b and 26b and the respective grooves 22c and 22c is also large.

Further, since the lower end 26a of the flat line is configured to be inscribed in the virtual bottom surface Cb of the hair follicle hole, the flat line 26 does not protrude downward from the virtual bottom surface Cb of the hair follicle hole. Therefore, it is possible to prevent an accident in which the flat wire 26 protrudes from the head portion 22 and damages the inside of the oral cavity M of the user.

[Production method]
In FIG. 18, S2000 illustrates a method of manufacturing a toothbrush 21 according to a fifth embodiment of the present invention.

In the pushing step S2022 of the toothbrush manufacturing method S2000, the flat wire bottoming is a step in which the flat wire 26 is inserted until each folded-back portion 25 abuts on the recessed bottom portion 9b which is the bottom of each recessed portion 9 to be inserted. Includes step S2022a. At this time, the flat line pushing assist tool 8 shown in FIG. 6 is configured so that the depth of the recessed portion 9 coincides with the height of each folded-back portion 25 in the vertical direction. Therefore, the flat line 26 stops the entry into the downward hair follicle hole 23 by the lower end of each folded-back portion 25 hitting the recessed bottom portion 9b.

Further, since the flat wire pushing assist tool 8 is made of a material harder than the flat wire 26, even if the flat wire 26 is further pushed in, the lower end 26a of the flat wire may be buried in the head portion receiving surface 8a. Absent.

FIG. 19 shows a state in which the flat line pushing assist tool 8 is attached to the head portion 22, the folded-back portion 25 fits inside the recessed portion 9, and the lower end of the folded-back portion 25 hits the recessed bottom portion 9b.

Other steps and steps are common to the method for manufacturing a toothbrush in the fourth embodiment.

In this way, the length of the folded-back portion 25 protruding from the back surface 22b side opening can be regulated by the depth of the recessed portion 9. As a result, the protruding length is set to a length sufficient for wiping off water such as saliva, chemicals, running water, and washing water with a water absorbing material such as cloth, cotton, and paper, and work, use, storage, and so on. It is possible to set it to something that is not too long for aesthetic purposes. In this way, the toothbrush 21 that can remove the water and keep it clean can be manufactured.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.

For example, the hair-implanted hole does not have to be a round hole, and may be formed into an elliptical hole or a square hole as long as the brush can be bundled and planted in the state of a hair bundle.

Further, the number of hair follicles provided in the head portion does not have to be multiple, and a single hair follicle hole may be used. Along with this, the hair bundle to be planted may be single. Further, the recessed portion provided in the flat wire pushing aid may also be a single recess.

When the folded-back portion protrudes from the head portion and is exposed, the back side opening edge does not have to have the same diameter as the recessed edge as long as the flat wire pushing aid does not interfere with the protrusion of the folded-back portion from the head portion. The diameter may be smaller or larger than the edge.

The material of the flat wire does not have to be metal, and may be plastic, for example, as long as it has a hardness sufficient to be driven into the head portion.

When the folded-back portion protrudes from the head portion and is exposed, when driving the flat wire, if the protrusion of the folded-back portion from the head portion is not hindered, for example, the head portion is placed in the air without using the flat wire pushing assisting tool. You may support the hair bundle with one hand and support the hair bundle with the other hand and push it in.

When the hair bundle is planted in the head portion, a flat wire may not be used, and for example, the brush may be welded to the head portion and fixed.

The upper end of the flat wire does not necessarily circumscribe the virtual upper surface of the reduced diameter portion, but if the flat wire can be pushed deep enough so that the hair bundle does not come off from the flocked surface side, it is located above the virtual upper surface of the reduced diameter portion. You may.

Even if the reduced diameter portion is not provided unevenly on the back side, if the flat wire can be pushed deep enough so that the hair follicle does not come off from the flocked surface side, the reduced diameter portion virtual bottom surface is above the flocked hole virtual bottom surface. It may be provided so as to be located.

INDUSTRIAL APPLICABILITY The present invention can be used in a method for manufacturing a toothbrush, which comprises a toothbrush preparation step of preparing a toothbrush having a head portion through which a bristling hole penetrates a head portion and a toothbrush having a head portion having a penetrating blistering hole.

1,11,21,101,111 Toothbrush 2,12,22,102,112 Head part 3,13,23,103,113 Hair follicle holes 103c, 113c Reduced diameter part 4,14,24,104,114 Hair bundle 4a , 14a, 24a, 104a, 114a Brush 5,15,25,105,115 Folded part 6,16,26,106,116 Flat line 7,17,27,107,117 Straight part 8 Flat line pushing aid 9 Indentation Part C Hair follicle hole Cylindrical space (approximately prismatic)
Cb Flocked hole virtual bottom surface E Shrinked part columnar space Ea Shrinked part virtual top surface Eb Shrinked part virtual bottom surface S1000, S1100, S1200, S2000 Toothbrush manufacturing method S1010, S1110, S1210, S2010 Preparation process S1011, S1111, S1211, S2011 Toothbrush preparation process S1012, S1112, S2012 Auxiliary tool preparation process S1020, S1120, S1220, S2020 Planting process S1021, S1121, S2021 Auxiliary tool mounting step S1022, S1122, S1222, S2022 Pushing step S1023, S1123, S2023 Auxiliary tool removal Step

Claims (13)

It is provided with a brush and a head portion for implanting a hair bundle in which a plurality of the brushes are bundled, and the head portion has a hair-implanted surface and a hair-implanted hole is formed in the hair-implanted surface, and the hair bundle is folded in two. A toothbrush that is planted in the flocked hole with the folded portion, which is the portion that is folded in two, at the head in the state of being folded in two.
The flocked hole penetrates the back surface of the head portion opposite to the flocked surface.
The hair bundle is a toothbrush characterized in that the folded portion is exposed at the opening on the back surface side.
It has a flat line that is driven into the hair follicle hole and has
The toothbrush according to claim 1, wherein the hair bundle is folded in half by the flat line and pushed into the hair-implanted hole.
The inner space of the hair follicle hole is formed in a substantially prismatic shape.
The flat line is arranged so that the lower end of the flat line, which is one side of the back surface side, is located closer to the flocking surface side than the flocking hole virtual bottom surface, which is the virtual pillar-shaped virtual back surface side end surface. The toothbrush according to claim 2, wherein the toothbrush is characterized in that.
The inner space of the hair follicle hole is formed in a substantially prismatic shape.
The flat line is characterized in that the lower end of the flat line, which is one side of the back surface side, is arranged so as to be inscribed in the virtual bottom surface of the hair follicle hole, which is the virtual bottom surface of the back surface side having a substantially prismatic shape. The toothbrush according to claim 2.
The toothbrush according to claim 3 or 4, wherein the thickness of the head portion is formed in a range of 1.5 mm or more and less than 4.0 mm.
The toothbrush according to claim 3, wherein the flocked hole has a reduced diameter portion whose inner diameter is smaller than the opening diameter on the flocked surface.
The toothbrush according to claim 6, wherein the reduced-diameter portion coincides with the virtual bottom surface of the reduced-diameter portion, which is the virtual bottom surface on the back surface side of the inner space thereof, and the virtual bottom surface of the hair follicle hole.
7. The flat line is arranged so that the lower end of the flat line circumscribes the virtual upper surface of the reduced diameter portion, which is the virtual upper surface of the reduced diameter portion on the inner space of the reduced diameter portion. Toothbrush described in.
The inner space of the hair follicle hole is formed in a substantially prismatic shape.
The toothbrush according to any one of claims 1 to 8, wherein the folded portion is inscribed in the virtual bottom surface of the hair-implanted hole, which is the virtual bottom surface of the back side of the substantially prismatic shape.
A preparation step including a toothbrush preparation step, which is a step of preparing a toothbrush having a head portion having a penetrating pore,
A hair follicle in which a plurality of brushes are bundled is folded in half by hitting a flat line, and both the hair follicle in the two-folded state and the flat line are headed at the folded portion which is the part where the two folds are made. A method for manufacturing a toothbrush, which comprises a step of fitting the toothbrush through one opening of the hair-implanted hole and pushing the folded-back portion into the other opening of the hair-implanted hole until it is exposed.
Prior to the planting step, an auxiliary tool preparation step, which is a step of preparing a flat wire pushing auxiliary tool having a concave recessed portion on a flat surface, is included.
10. The planting step comprises the step of mounting the flat wire fitting assisting tool on the other opening side of the head portion so that the recess portion overlaps the other opening. The method for manufacturing a toothbrush according to the description.
The method for manufacturing a toothbrush according to claim 11, wherein the planting step includes a step of inserting the flat wire until the folded portion abuts on the bottom of the recessed portion.
In the toothbrush preparation step, a toothbrush having a reduced diameter portion whose inner diameter is smaller than the opening diameter of the one opening is prepared as the toothbrush.
The method for manufacturing a toothbrush according to claim 10, wherein in the planting step, the folded-back portion is pushed so as to come into contact with the reduced-diameter portion.

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