WO2011030939A1

WO2011030939A1 - Preparation method of toothbrush, and toothbrush prepared thereby

Info

Publication number: WO2011030939A1
Application number: PCT/KR2009/005154
Authority: WO
Inventors: 정태상
Original assignee: Chung Tae Sang
Priority date: 2009-09-11
Filing date: 2009-09-11
Publication date: 2011-03-17
Also published as: CN102791165A; KR20120056311A

Abstract

The present invention provides a preparation method of a toothbrush comprising: the step of preparing toothbrush bristles, the step of implanting the prepared toothbrush bristles on an implant member, and the step of coupling the completely implanted implant member to a toothbrush head, and a toothbrush prepared thereby, wherein the step of preparing toothbrush bristles comprises: the step of collecting a strand of a plurality of toothbrush bristles in a line, and the step of adhering the lower portion of the collected strand of toothbrush bristles to make a bundle.

Description

Toothbrush manufacturing method and toothbrush manufactured by this method

The present invention relates to a method of manufacturing a toothbrush using an anchorless method of planting bristles without using an anchor, and a toothbrush manufactured by the method.

The bristles that fix the bristles to the toothbrush heads using metal anchors are more brittle than the anchorless method without anchors, and it is difficult to vary the shape of the bristles (length, thickness, color, etc.) Therefore, in recent years, most of the related industries manufacture toothbrushes using an anchorless method.

A toothbrush manufactured by the anchorless method includes a toothbrush having a bristles, a flat bristle member (generally referred to as a head insert) on which the bristles are to be planted, and a toothbrush head to which the bristles are coupled. At this time, the bristles member has a plurality of bristles strands inserted into the tuft hole, respectively, the bristles of the bristles are inserted into the tuft holes from the base of the bristles in the upper side of the tufts, and thus the bristles are inserted. The bristle strand is positioned at the bottom of the tuft member. Thereafter, the bristle strand thus inserted is fused with its root portion and bonded to the tuft member.

However, the conventional toothbrush manufacturing method using such an anchorless method has to insert the bristles strands into the hair transplant hole during planting one by one, it is difficult to manually work, so considerable time and manpower is required, and quality cannot be guaranteed. Therefore, in recent years, automation equipment is used, but since the automation is a very difficult task, the structure of the equipment is inevitably complicated and expensive. In particular, since the automation equipment is designed to suit a toothbrush of any design, when a toothbrush of a new design was developed, part or all of the equipment had to be improved or newly designed and manufactured accordingly, which may not be a huge loss. There was no.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for achieving a toothbrush manufactured at a relatively simple and low cost and a toothbrush made by the method.

According to an embodiment of the present invention, a bridging step of dense a plurality of bristles strands side by side; There is provided a bristles manufacturing method comprising a step of adhering one end of the dense bristle strands together to form a bundle of the dense bristle strands.

Here, the hair bonding step may be bonded to each other by fusing one end of the dense bristle strands. At this time, the fusion may be made by hardening the cut surface formed by cutting one end of the dense bristle strand with a heated cutter.

According to an embodiment of the present invention, the bristle manufacturing step of making a bristle bundle having a cross-sectional area or more by a predetermined area by the bristle manufacturing method; A bristle cutting step of cutting the adhesive portions of the bristle bundles so that the manufactured bristle bundles are divided into a plurality of bundles, thereby providing a unit bristle bundle having a cross section corresponding to a tuft hole of the tufts member; Inserting the non-bonded portion of the unit bristle bundle into the tuft hole to position the bonding portion of the unit bristle bundle on the bottom of the tufting member, and then fusion bonding the adhesive portion to fix the unit bristle bundle to the tufting member. A planting step; There is provided a toothbrush manufacturing method comprising a bristle member coupling step of coupling a bristle member in which the unit bristle bundle is planted on a toothbrush head.

Here, in the planting step, the unit bristle bundle may be inserted into the planting hole through a jig having a guide hole corresponding to the planting hole. At this time, the guide hole of the jig is preferably formed such that the size of the outlet facing the tuft hole is the same as or larger than the adhesive portion of the unit bristle bundle. In addition, the guide hole of the jig can be extended to the entrance in which the unit bristle bundle is inserted.

In addition, the tuft hole may have a structure in which the bottom side open portion of the tuft member of the both sides is extended, according to this structure can be operated without the jig when the unit bristle bundle is inserted into the tuft hole.

Further, the fusion in the planting step may be made by curing the liquid thermoplastic resin by coating the liquid thermoplastic resin on the bottom surface of the planting member. At this time, the tuft member is provided with a groove in which the tuft holes are arranged on the bottom, and the liquid thermoplastic resin is filled in the groove of the tuft member to be coated on the bottom of the tuft member.

According to an embodiment of the present invention, the bristles manufacturing step of making a bristle bundle having a cross section corresponding to the tuft hole of the tufts by the bristle manufacturing method; Inserting an unbonded portion of the prepared bristle bundle into the tuft hole to position the bonding portion of the bristle bundle on the bottom of the tufting member, and then fusing the adhesive portion to fix the bristle bundle to the tufting member. Steps; There may be provided a toothbrush manufacturing method comprising a bristle member coupling step of coupling the bristle member in which the bristle bundle is planted to a toothbrush head.

In addition, according to an embodiment of the present invention, by inserting the bristles in the tuft hole of the tufts member to position the buttocks of the bristle on the bottom of the tufts of the tufts member to fusion the buttocks to fix the bristles to the tufts member; A planting step; And a bristles member coupling step of coupling the bristles on which the bristles are planted to a toothbrush head, wherein the bristles step includes inserting the bristles into the tuft holes through a jig having a guide hole corresponding to the tuft holes. May be provided.

In addition, according to an embodiment of the present invention, by inserting the bristles in the tuft hole of the tuft member to place the base of the bristles on the bottom of the tuft member, and then coated a liquid thermoplastic resin on the bottom of the tuft member A hair removal step of fixing the bristles to the hair removal member by curing the thermoplastic resin; There may also be provided a toothbrush manufacturing method comprising a bristle member coupling step of coupling the bristle member in which the bristles are planted on a toothbrush head.

According to an embodiment of the present invention, there is provided a bristle, a bristle member in which the bristle is planted, and a toothbrush head in which the bristle member is coupled, and a toothbrush manufactured by the toothbrush manufacturing method described above is provided.

Here, the toothbrush head may have a receiving groove into which the tuft member is fitted in an interference fit manner. At this time, the toothbrush head and the tuft member received in the toothbrush head may be bonded to each other. In addition, the bottom of the receiving groove may be provided with a coupling groove along an edge, the coupling member may be provided with a coupling jaw fitted into the coupling groove.

According to the embodiment of the present invention, it is possible to easily achieve a variety of bristles (thickness, color, shape, etc.) at low cost.

1 is a flow chart illustrating a toothbrush manufacturing method according to the present invention.

Figure 2 shows an example of a toothbrush manufactured by a toothbrush manufacturing method according to the present invention, (A) is a perspective view of the entire toothbrush, (B) is a perspective view of the tufting member of the toothbrush, (C) is A toothbrush head of a toothbrush is a perspective view shown.

3 to 9 is a view showing a toothbrush manufacturing method according to the present invention step by step, Figures 3 to 5 is a bristle manufacturing step, Figure 6 is a bristle cutting step, Figures 7 and 8 are a hair transplant step, 9 shows the hair-stall binding step, respectively.

10 is a perspective view showing other examples of the toothbrush manufactured by the toothbrush manufacturing method according to the present invention.

11 and 12 show a planting step of the toothbrush manufacturing method by the type of planting member different from that shown in FIG.

1: bristle strand 5: bristle bundle

10:

unit bristle bundle

20, 20A, 20B: hair removal

22: Groove 24, 24A, 24B of the hair transplant member: Hair transplant hole

26: combined jaw 30: toothbrush head

32: accommodation groove 34: coupling groove

60: cutter 85: jig

86: guide hole R: thermoplastic resin

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of the present invention. For reference, in describing the present invention, the size of the components shown in the accompanying drawings, the thickness of the lines, etc. may be somewhat exaggerated for convenience of understanding. In addition, since terms used in the description of the present invention are defined in consideration of functions in the present invention, they may be changed according to intentions of users, operators, and the like. Therefore, the definition of these terms should be based on the contents throughout the specification.

1 is a flow chart illustrating a toothbrush manufacturing method according to the present invention. As shown in Figure 1, the toothbrush manufacturing method according to the invention is the bristles manufacturing step (see S10) to make a plurality of bristles (see reference numeral 1 in Figure 3), the bristle bundles (see Figure 5 and A bristle cutting step (see S20) for cutting and dividing a unit bristle bundle (see reference numerals 10 in FIGS. 2 and 6 to 9) having a desired cross section by cutting and dividing the reference numeral 5 in FIG. Step of planting the bristles of the unit bristles (see S30) in the reference numeral 20 of the (9) to 9, the step of joining the bristles member for coupling the hair-planting member is completed to the toothbrush head (see 30 in FIGS. 2 and 9) of the toothbrush S40 reference).

Figure 2 is a perspective view showing an example of a toothbrush manufactured by a toothbrush manufacturing method according to the present invention. As shown in Figure 2, the toothbrush manufactured according to the above step is a bristle, which is a set of unit bristle bundle 10, the flat bristle member 20, the bristle is planted, the bristle member 20 is coupled Toothbrush head having toothbrush head 30.

Here, the tuft member 20 is provided with the groove | channel 22 of the size which occupies remainder except the edge part of this bottom face in the bottom face. The grooves 22 of the tufting member 20 are formed with a plurality of tuft holes 24 for planting the unit bristle bundles 10 one by one. The tuft holes 24 are all circular and have the same size and the grooves ( 22) so that they are spaced apart throughout.

The toothbrush head 30 has a receiving groove 32 to which the tuft member 20 is fitted and engaged. At this time, the tuft member 20 is fitted with its bottom face facing the bottom of the receiving groove 32.

3 to 9 show each step of the toothbrush manufacturing method according to the present invention. Next, referring to Figures 3 to 9, by looking at the process of manufacturing a toothbrush in the shape of the bristles as shown in Figure 2 in the toothbrush manufacturing method according to the present invention, each step of the toothbrush manufacturing method according to the present invention in detail Explain.

1. Bristle manufacturing steps

The bristles manufacturing step S10 includes a wool processing step (see S11), a hair dense step (see S12), and a hair bonding step (see S13).

(a) Parent machining step (see Figure 3)

The tip of bristles of constant length (1) is processed to be effective in removing tartar and plaque and preventing gum damage when brushing by processing such as grinding or dipping. 3 illustrates a processed bristle strand. (A) of FIG. 3 shows the bristle strand processed to be round, and FIG. 3 (B) shows the bristle strand processed to have a taper.

(b) densely packed step (see FIG. 4)

After gathering a plurality of the bristles (1) through the bristle processing step (S11) side by side and aligned neatly, by winding the paper band (50) to bind.

In this step, a dense mold having holes or grooves may be used instead of the paper band 50 for the densities of the processed bristle strands 1, when the bristle strands 1 are used as holes or grooves in the mold. It is inserted tightly into the and is densely packed. Using such a framework is more advantageous for setting the densities of the bristle strands 1 as compared to using the paper band 50. This is because the shape of the dense bristle strand 1 is determined according to the shape of the frame or the groove (for example, if the shape of the hole or the groove of the frame is circular, the shape of the dense bristle strand is also circular).

Such a densely packed step (S12) may include a wool setting process. Here, the hair setting process means that the ends of the dense bristle strands 1 have a specific shape. In one example, this process can be made by pressing against the base of the bristle bristle (1) dense on the setting plate is formed on the top surface irregularities. At this time, the dense bristle strands 1 have the same shape as the top of the setting plate.

(c) parent bonding step (see FIG. 5)

In this step, the dense bristle bristle strands 1 are bundled into one bundle by adhering the root portions of the bristle bristle strands 1 in the densely packed step S12.

The base part adhesion here is made by cutting the base part of the dense bristle strand 1 with the cutter (for example, the cutter with a built-in heating wire) heated to a predetermined temperature. At this time, the cutting of the bristle bristle strand 1 is made with the paper band 50 which maintains the dense form of the bristle bristle strand 1, and the root part of the bristle bristle strand 1 is attached to the cutter 60. The bristle bristle strands 1 are adhered to each other by hardening of the molten cut surface, after being melted by heat at the same time as being cut.

According to such a hair bonding step (S13), the sole portion is bonded by fusion, and a bristle bristle (bristle bristle bundle 5) of the shape is manufactured. Of course, the bristles are formed in the specific shape if the end has been subjected to the hair setting process in the hair cluster step (S12) above.

2. Brush head cutting step (see Figure 6)

In this step, the bristle bundle 5 manufactured in the bristle manufacturing step S10 above is divided into a plurality of unit bristle bundles 10 having a cross section of an area corresponding to the tuft hole 24.

A cutting mechanism 70 including a work table 72 and a plurality of cutters 74 provided in a row on the upper surface of the work table 72 is used to divide the bristle bundle 5.

When the adhesive portion (base portion) of the bristle bundle 5 is placed on the work table 72 of the cutting mechanism 70 and then pushed toward the cutter 74 side, the bristle bundle 5 has the adhesive portion of the cutter 74. It is cut | disconnected and divided into several pieces. Turning the divided bristle bundle (5) 90 degrees and then cut once more in the same manner is provided with square unit bristle bundles (10). The spacing of the cutters 74 is set such that the cross section of the unit bristle bristle 10 has an area corresponding to the area of the tuft hole 24 when the cutting operation is performed in this way.

3. Planting stage

The planting step S30 includes a bristles insertion step (see S31) and a bristle fixing step (see S32).

(a) bristle insertion step (see FIG. 7)

First, the hair-planting member 20 is placed on the hair-planting stage 80, and the top surface of the hair-planting member 20 abuts against the hair-planting stage 80 so that the bottom surface of the hair-planting member 20 faces upward.

Next, the jig 85 is placed on the bottom face of the tuft member 20. At this time, the jig 85 has guide holes 86 that coincide with the seedling holes 24 when the jig 85 is located on the bottom surface of the seedling member 20. An outlet (at the bottom, in the figure) facing the 24 is formed to be the same as the adhesive portion of the unit bristle bundle 10 or slightly larger than the adhesive portion of the unit bristle bundle 10. The inlet (see bottom view) of the guide hole 86 is formed to have an expanding structure.

Subsequently, an end portion (non-bonded portion) of the unit bristle bundle 10 is inserted into the inlet of the guide hole 86 and through the guide hole 86 to the tuft hole 24 corresponding to the guide hole 86. Each of the unit bristle bundles 10 is inserted to position the adhesive portion of the unit bristle bundle 10 in the groove 22 of the tufting member 20. At this time, since the inlet of the guide hole 86 has an expanded structure, the unit bristle bundle 10 is easily inserted. In addition, the unit bristle bundle 10 thus inserted is naturally inserted into the hair transplant hole 24 along the inner wall of the guide hole 86. Therefore, the insertion work of the unit bristle bundle 10 can be performed quickly and accurately.

Inserting the whole bristle bundle 10 into the tuft hole 24 removes the jig 85.

(b) brush head fixing step (see FIG. 8)

The liquid thermoplastic resin R is filled in the grooves 22 of the tuft member 20 in which the unit bristle bundle 10 is inserted. When the time elapses, the liquid thermoplastic resin R filled in the grooves 22 of the tuft member 20 is cured. Then, when the thermoplastic resin is cured, the unit bristle bundle 10 inserted into the tuft hole 24 is fixed to the tuft member 20. That is, by the hardened thermoplastic resin, the bonding part 20, the adhesive part of the unit bristle bundle 10, and the thermoplastic resin are integrally formed.

If the tuft member 20 (see FIG. 11) without the groove 22 is used, the bottom surface of the tuft member 20 may be coated with a constant thickness instead of filling the liquid thermoplastic resin R. Referring to FIG.

On the other hand, the fixing method of the unit bristle bundle 10 inserted into the tuft hole 24 is not using a liquid thermoplastic resin (R), the heat plate is inserted into the groove 22 of the tuft member 20 by heat and pressure It is also possible to fuse the adhesive portion of the unit bristle bundle 10 by adding. Of course, even in this case, when the fusion is completed, the tuft member 20 and the unit bristle bundle 10 is bonded to each other.

4. Parenting member joining step (see Fig. 9)

After inserting the bristle member 20 which has undergone the bristle fixing step (S30) in the receiving groove 32 of the toothbrush head 30, and bonding the contact surface between the bristle member 20 and the toothbrush head 30 using ultrasonic waves. . The tufting member 20 and the toothbrush head 30 may be configured as follows to improve the bonding force (adhesive force) between each other at the time of coupling.

The receiving groove 32 of the toothbrush head 30 is formed to a size to which the tuft member 20 is fitted in an interference fit manner. In addition, the toothbrush head 30 is provided with a coupling groove 34 at the bottom of the receiving groove 32 along the edge of the receiving groove 32, and the tuft member 20 is a coupling groove 34 at the edge of the bottom face. It is provided with a coupling jaw 26 is fitted to be coupled to. According to this structure, the tuft member 20 is forcibly fitted to the receiving groove 32, and when the fitting jaw 26 is fitted to the coupling groove 34 when it is thus inserted, the tuft member 20 with The adhesion between the toothbrush head 30 can be increased, and the contact area can be increased, and the coupling force between the tuft member 20 and the toothbrush head 30 is improved.

10 is a perspective view showing other examples of the toothbrush manufactured by the toothbrush manufacturing method according to the present invention. According to the toothbrush manufacturing method according to the present invention, in addition to the uniform shape of the bristles like the toothbrush shown in Figure 2, as shown in Figure 10 it is possible to manufacture a toothbrush in a variety of shapes of the bristles simply and at a low cost. . The toothbrush shown in FIG. 10 may also be manufactured in the same manner as described above, but a bristle bundle 5 having a cross section of a predetermined area is made, and the bristle bundle 5 is cut and divided to form a plurality of unit bristles. Without providing the bundle 10, in the bristles manufacturing step (S10) to create a bristle bundle having a cross-section corresponding to the tuft hole 24, and after planting the bristle bundles thus prepared is planted in the toothbrush head 30 It may also proceed in such a manner as to couple the tuft member 20. In the preparation of the bristle bundle having a cross section corresponding to the tuft hole 24, the mold mentioned in the hair clustering step S12 may be used.

According to the method of manufacturing a toothbrush as described above, since the planting of the bundle of bristles of the sole part is implanted, it is possible to ensure the quality of the manufactured toothbrush and to easily diversify the shape of the bristles. In particular, when the bristle strands 1 having different thicknesses, colors, shapes, etc. are concentrated in the hair clustering step S12, a toothbrush in which several kinds of bristle strands 1 are mixed in one tuft hole 24 may be manufactured. It may be.

FIG. 11 shows a planting step of the toothbrush manufacturing method by the type of planting member different from that shown in FIGS. 2, 7 to 9. The tuft hole 24A of the tuft member 20A shown in FIG. 11 is formed so that the bottom side opening part of the tuft member 20A among them may have a structure which gradually expands toward the bottom side of this tuft member 20A. The hair growth hole 24A thus formed serves as a guide hole 86 of the jig 85, and the jig 85 inserts the unit bristle bundle 10 into the hair growth hole 24A. It can be done without. That is, the insertion work of the unit bristle bundle 10 is convenient. According to the extended portion of the tuft hole 24A, the unit bristles inserted into the tuft hole 24A because the adhesive portion of the unit bristle bundle 10 inserted in the tuft hole 24A is accommodated in the extension part of the tuft hole 24A. An improved binding force on the bundle 10 can be expected.

Figure 12 shows the planting step of the toothbrush manufacturing method by another type of planting member. The tuft hole 24B of the tuft member 20B shown in FIG. 12 has a constant angle inclined shape, not vertical. In more detail, neighboring tuft holes 24B are inclined in opposite directions to each other. According to this tuft member 20B, the unit bristle tufts 10 inserted in the tuft hole 24B constitute bristles having a form in which they cross each other. For reference, here, the heating plate was used to fix the unit bristle bundle 10 inserted into the tuft hole 24B. That is, after the insertion is completed, heat and pressure are applied to the adhesive portion of the unit bristle bundle 10 to fuse the adhesive portion of the unit bristle bundle 10 to the bottom surface of the tuft member 20.

The present invention has been described above, but the present invention is not limited to the embodiments disclosed in the specification and the accompanying drawings, and may be variously modified by those skilled in the art without departing from the technical spirit of the present invention.

For example, in the above, it has been described that the hair processing step S11 of the bristles manufacturing step S10 is performed before the hair dense step S12, but the hair processing step S11 may be performed after the hair dense step S12. It may be. In other words, it may be extremely at the end of toothbrush manufacturing.

In addition, the bristle insertion method using a jig in the bristles insertion step (S31) of the hair transplant step (S30) and the bristle fixing method according to the coating of the thermoplastic resin in the bristle fixing step (S32) without the bristle strands strands as it is stranded It can also be applied to a method of preparing a toothbrush by planting.

Claims

A hair dense step of dense a plurality of bristle strands side by side;

And a bristle bonding step of adhering one of the dense bristle strands to each other to form a bundle of the bristle bristle strands.
The method according to claim 1,

Fusion in the step of bonding the bristles is a bristle manufacturing method made by hardening the cut surface formed by cutting one end of the dense bristle strand with a heated cutter.
A bristles manufacturing step of making a bristle bundle having a cross section of a predetermined area or more by the method of claim 1;

A bristle cutting step of cutting the adhesive portions of the bristle bundles so that the manufactured bristle bundles are divided into a plurality of bundles, thereby providing a unit bristle bundle having a cross section corresponding to a tuft hole of the tufts member;

Inserting the non-bonded portion of the unit bristle bundle into the tuft hole to position the bonding portion of the unit bristle bundle on the bottom of the tufting member, and then fusion bonding the adhesive portion to fix the unit bristle bundle to the tufting member. A planting step;

Toothbrush manufacturing method comprising a bristle member coupling step of coupling the bristle member in which the unit bristle bundle is planted on the toothbrush head.
The method according to claim 3,

Wherein the planting step is a toothbrush manufacturing method for inserting the unit bristle bundles in the planting hole through a jig having a guide hole corresponding to the planting hole.
The method according to claim 4,

The guide hole of the jig is formed so that the size of the outlet facing the tuft hole is the same as or larger than the adhesive portion of the unit bristle bundle.
The method according to claim 4,

Guide hole of the jig is toothbrush manufacturing method of the toothbrush is extended to the unit bristle bundle is inserted.
The method according to claim 3,

The tuft hole has a structure in which the bottom side open portion of the tuft member has an expanded structure of both sides.
The method according to claim 3,

The fusion in the planting step is performed by coating the liquid thermoplastic resin on the bottom surface of the planting member so that the liquid thermoplastic resin is cured.
The method according to claim 8,

The planting member is provided with a groove in which the planting hole is arranged on the bottom surface,

And said liquid thermoplastic resin is filled in the groove of said hair removal member to be coated on the bottom surface of said hair removal member.
A bristles manufacturing step of producing a bristle bundle having a cross section corresponding to the tuft hole of the tuft member by the method of claim 1;

Inserting an unbonded portion of the prepared bristle bundle into the tuft hole to position the bonding portion of the bristle bundle on the bottom of the tufting member, and then fusing the adhesive portion to fix the bristle bundle to the tufting member. Steps;

Toothbrush manufacturing method comprising a bristle member coupling step of coupling the bristle member planted with the bristle bundle to the head.
A bristles step of inserting bristles in the hair transplantation holes of the tufting members to position the bases of the bristles on the bottom of the tufting members, and then fusion welding the bottoms of the tufts to fix the bristles to the tufting members;

A bristles member joining step of coupling the bristles with the bristles planted on the toothbrush heads,

The planting step is a toothbrush manufacturing method for inserting the bristles in the hair-planting hole through a jig having a guide hole corresponding to the hair-planting hole.
The bristles are formed by inserting bristles in the hair transplanting holes of the hair-stripping member, placing the base of the bristles on the bottom of the hair-stripping member, and then coating the liquid thermoplastic resin on the bottom of the hair-stripping member to cure the thermoplastic resin of the liquid phase. A hair transplanting step of fixing the bristles to a member;

Toothbrush manufacturing method comprising a bristle member coupling step of coupling the bristle member implanted with the bristles on the toothbrush head.
A toothbrush comprising the bristles, a bristles on which the bristles are implanted, and a toothbrush head to which the tufts are joined, the toothbrush manufactured by the method according to any one of claims 3 or 9 to 11.
The method according to claim 13,

And the toothbrush head has a receiving groove into which the tuft member is fitted in an interference fit manner.
The method according to claim 14,

The toothbrush head and the tuft member received in the toothbrush head are bonded to each other.
The method according to claim 14 or 15,

The bottom of the receiving groove is provided with a coupling groove along the edge,

The toothbrush is provided with a coupling jaw fitted into the coupling groove.