JP7005339B2 - Replacement brush for electric toothbrush - Google Patents

Description

The present invention relates to a replacement brush for an electric toothbrush.

The electric toothbrush uses the kinetic energy of the motor to move the head part including the brush of the toothbrush to obtain a cleaning effect when used in the oral cavity. It is composed of a head portion for generating energy, and a connecting structure portion which is an elongated structure for connecting the main body portion and the head portion. The target of cleaning in the oral cavity is mainly the tooth surface. It is known that the head portion of the toothbrush is difficult to move freely because the gap between the tooth surface or gum and the inner cheek portion is narrow, particularly in a portion close to the back teeth, and it is difficult to obtain a sufficient cleaning effect. In particular, in the case of an electric toothbrush, since the head part is moved by utilizing the driving force of the main body motor, the head part is larger than that of a normal toothbrush, and there is a problem that cleaning failure is likely to occur in a part near the back teeth. was there. Therefore, in order to simplify the structure of the head portion of the electric toothbrush, there has been an attempt to reduce the size of the head portion by reciprocating the entire brush portion and the connecting structure portion.

However, even if the size is reduced, the toothbrush head part is larger than the void in the oral cavity, so if the entire head part and the connecting structure part are reciprocated, the reciprocating vibration occurs in the oral cavity part that comes into contact with the electric toothbrush other than the cleaning part. Is inevitable. For this reason, it is necessary for people other than the person, such as those who need care or infants, to handle the electric toothbrush, who have weakened oral tissue due to discomfort caused by vibration given to the oral cavity, surgical measures, trauma, inflammation, etc. In some people, there is a risk of straining or damaging the oral tissue due to the vibration caused by the reciprocating motion.

In order to solve this problem, some electric toothbrushes having a new mechanism for driving only the brush portion as in the conventional case have been proposed. For example, a technique of combining a magnet and an exciting coil and attaching a brush portion to the head portion via a diaphragm or a hinge structure (Patent Document 1), or a combination of a permanent magnet subjected to multi-pole magnetization and a diaphragm having an exciting coil. Examples thereof include a technique for forming a brush portion (Patent Document 2). However, since the structure of these head portions cannot be simplified, not only the miniaturization of the head portion, which is a conventional problem, cannot be sufficiently improved, but also the structure is often complicated, so that the manufacturing cost is high. There was a problem of becoming too much.

Japanese Unexamined Patent Publication No. 2009-0452202 Japanese Unexamined Patent Publication No. 2009-106355

The present invention is to provide a replacement brush for an electric toothbrush, which is difficult to transmit vibration to an oral cavity portion other than the purpose of cleaning while maintaining a high cleaning power, has an excellent usability, and is excellent in safety. ..

The present inventors do not fix the "replacement brush outer shell (8)" that forms the main appearance of the replacement brush body and the "flocking table (3)" that has a bundle of filaments planted, but rather the replacement brush outer shell. The hair-planting table (3) is joined to the body (8) in a swingable state, and the hair-planting table (3) is vibrated, rocked, rotated or positive by using the driving force of the electric toothbrush main body (1). We have found that it is possible to provide a replacement brush for an electric toothbrush that does not transmit vibration to the oral tissue as much as possible while maintaining a high cleaning force by adopting a structure that is inverted, and has completed the present invention.

That is, the present invention provides a replacement brush for the electric toothbrush according to the following items 1 to 6.
Item 1. The flocking table (3) on which the filament (2) is transplanted is oscillatingly joined to the replacement brush outer shell (8) via the joining member (4) capable of structural deformation.
The flocking table (3) and the drive transmission portion of the electric toothbrush body are connected by a shaft (6) so that the flocking table can swing with the movement of the drive unit of the electric toothbrush body.
A replacement brush for electric toothbrushes that can be attached to and detached from the electric toothbrush body (1).
Item 2. Item 2. The replacement brush for an electric toothbrush according to Item 1, wherein the deformable joining member (4) is made of an elastomer, rubber, or silicone.
Item 3. Item 6. The replacement brush for an electric toothbrush according to any one of Items 1 and 2, wherein the deformable joining member (4) has a U-shaped or V-shaped cross section.
Item 4. Item 1 to any one of Items 1 to 3 in which the flocking table (3) and the electric toothbrush main body drive transmission unit are connected by a shaft (6) so that the flocking table (3) reciprocates or reverses and reciprocates. Replacement brush for electric toothbrush described in the section.
Item 5. Item 4. The electric toothbrush according to Item 4, wherein the flocking table (3) and the electric toothbrush main body drive transmission unit are connected by a shaft (6) so that the flocking table (3) reciprocates in the long axis direction of the replacement brush. Replacement brush.
Item 6. In the joining member (4) having a U-shaped or V-shaped shape, the phase difference when the joining member (4) is maximally deformed in the movement direction of the flocking table (3) is a (mm), and the flocking table is said. Item 5. The replacement brush for an electric toothbrush according to Item 5, wherein the following formula holds when the amplitude during exercise in (3) is b (mm).
0.5 * b + 0.1≤a≤0.5 * b + 1.0

Since the bristles (3) can be moved to clean the oral cavity without vibrating the outer shell (8) of the replacement brush, no unpleasant vibration is felt, and when a third party such as an infant or a person requiring care cleans the oral cavity. It is possible to provide an electric toothbrush that can be used with peace of mind even for people with disabilities such as the palate, cheeks and tongue.

Front view of the electric toothbrush. Side view of the electric toothbrush. Front view of the replacement brush. The front view of the replacement brush of the aspect different from FIG. Side view of the replacement brush. FIG. 3 is a cross-sectional view of a replacement brush in the ZZ line of FIG. FIG. 6 is an enlarged view of the toothbrush head portion in the cross-sectional view taken along the line ZZ of FIG. The figure which showed the surface opposite to the filament flocking surface of the flocking table (3).

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The present invention provides a replaceable brush body (7) that can be attached to and detached from the electric toothbrush body (1) in the electric toothbrushes exemplified in FIGS. 1 and 2, and a typical shape thereof is illustrated in FIG.

The electric toothbrush body (1) has at least a drive unit such as a motor, a power supply unit for supplying DC or AC electricity, an electric toothbrush body drive transmission unit, and a fixing portion for joining the replacement brush body (7). It is a structure provided with a structure that functions as a grip portion, and a drive portion such as a motor and a power supply portion are incorporated in a tubular member that is usually made of synthetic resin or metal. "Electric toothbrush body drive transmission unit (hereinafter, may be simply referred to as" drive transmission unit ")" means that the rotational movement of the motor built in the electric toothbrush body (1) is replaced with the brush body (7). It means a site provided for propagation. When the electric toothbrush is moved, the drive transmission unit makes a rotary motion or a reciprocating motion about the long axis direction of the electric toothbrush main body (1).

The replacement brush main body (7) of the present invention includes a replacement brush outer shell body (8) having a hollow structure at least partially, a flocking table (3) in which filament (2) is planted at least partially, and the above-mentioned flocking. A mechanically deformable joining member (4) for swingably joining the base (3) and the replacement brush outer shell (8), and the flocking base (4) linked to the phase change of the drive transmission unit. The minimum structural element is a shaft (6) for allowing the 3) to perform a reciprocating motion, a rotary motion, or the like, and a fixing portion (5) for joining to the electric toothbrush main body (1).

As the material constituting the filament (2), in addition to synthetic resin, silicone or elastomer can also be used. Specifically, a polyamide resin such as nylon 610, nylon 612 nylon or aramid, or a polyester resin such as polybutylene terephthalate (PBT), polypropylene terephthalate (polytrimethylene terephthalate, PPT or PTT) or polyethylene terephthalate (PET), polypropylene. Synthetic resins such as polyolefin resins such as (PP) and polyethylene (PE), polystyrene (SBC), polyolefin (TPO), polyvinyl chloride (TPVC), polyurethane (PU), polyester (TPEE), polyamide Thermoplastic elastomers (TPEs) such as systems (TPAE) can be mentioned. Philamen having a composite structure in which the above materials are processed into filaments by themselves or by using a mixture of two or more materials uniformly mixed, or by structurally combining members formed of a plurality of materials. It can be used as and so on.

A plurality of filaments (2) are bundled and transplanted into the flocking holes (9) previously formed in the flocking table (3). One or more flocking holes can be installed in the flocking table (3). As a means for flocking to the flocking table (3), a method of fixing a bundle of filaments to the flocking table using a metal flat plate piece called a "flat wire" or melting one end of a filament bundle made of synthetic resin. It is possible to use a method in which the hair is integrated by bonding and then melted, bonded or injection-molded in a resin to be embedded and fixed in the flocking table. However, the method is not limited to these methods, and any conventional method can be used.

The material constituting the replacement brush outer shell (8) and the flocking table (3) is a synthetic resin, and the material constituting the shaft (6) is a metal or a synthetic resin. These may use the same material or different materials. Examples of the types of synthetic resins that can be used include polypropylene (PP), polyethylene (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyethylene naphthalate (PEN), and polytrimethyl terephthalate (PTT). Polycarbonate (PC), polyoxymethylene (polyacetal resin (POM)), styrene / acrylonitrile resin (AS), acrylonitrile / butadiene / styrene resin (ABS), cellulose propionate (CP), polyamide (PA), polymethylmethacrylate (PMMA), polyallylate (PAR), polylactic acid (PLA), etc., among which polypropylene (PP), polyethylene terephthalate (PET), polyoxymethylene (polyacetal resin (POM)), acrylonitrile butadiene. Styrene resin (ABS) and polylactic acid (PLA) are preferable, and polyethylene terephthalate (PET) and polyoxymethylene (polyacetal resin (POM)) are more preferable from the viewpoint of durability. Polyethylene terephthalate (PET) is most preferable for the replacement brush outer shell (8) and the flocking table (3), and polyoxymethylene (polyacetal resin (POM)) is most preferable for the shaft (6).

Examples of the shape of the "plane on which the filament (2) is to be planted" in the hair planting table (3) include a substantially circular shape, a substantially elliptical shape, a substantially rectangular shape, a substantially square shape, a substantially triangular shape, a substantially pentagonal shape, a substantially hexagonal shape, and a substantially star shape. However, the shape is not limited to this, and any shape can be obtained. Further, the above-mentioned "flocked surface" is not only a flat surface, but also various three-dimensional surfaces such as a surface curved in a convex direction, an inclined surface, and a composite surface in which a plurality of planes are connected by providing a step in the convex direction or the concave direction. The structure can also be adopted. The arrangement of the flocking holes (9) in the flocking table (3) of the filament (2) is also not particularly limited and can be freely set regardless of the shape of the flocking table. Further, a structure other than the filament such as a pointed cone or a fine cylinder may be mixed with the filament and arranged on the flocking table.

The joining member (4) does not move the replacement brush outer shell body (8), but enables the flocking table (3) connected via the shaft (6) to move in conjunction with the phase change of the drive transmission unit. It is a structure for. In order to move only the flocking table (3), a replacement brush with the flocking table (3) using a joining member (4) that can swing the flocking table (3) by utilizing only the driving force of the electric toothbrush. The outer shell body (8) is joined. The material constituting the joining member (4) that can be joined swingably is not particularly limited as long as it is a material that can be deformed by the motor driving force of the electric toothbrush, but for example, an elastic body or an easy material. Examples thereof include metals, synthetic resins, elastomers, and silicones that can form structural variants. Of these, elastoma and silicone are preferable because they are superior in terms of manufacturing cost and energy efficiency, and from the viewpoint of saving power consumption and recovering deformation of the joining member, Shore A can be used as the kinetic energy of the flocking table. Most preferably, elastoma or silicone having a hardness of 30 to 55, preferably 40 to 55, and even more preferably 45 to 55.

The structure of the joining member (4) is not particularly limited as long as the structure of the joining member (4) can be deformed by the driving force of the electric toothbrush. However, it is necessary to have a stable structure that can realize the movement of the flocking table (3) to the extent that at least a sufficient oral cleaning function can be obtained and that the joining member (4) is not damaged even after long-term use. Further, since the brush portion (11) inserted into the oral cavity during use has a complicated internal structure as illustrated in FIG. 7, if moisture or dentifrice invades the inside of the brush portion, it can be sufficiently washed and dried. Since it is difficult to do this, not only is it inconvenient in terms of hygiene, but it may also reduce the durability and motor function of the replacement brush. Therefore, it is preferable to have a structure in which water or the like cannot enter the inside of the brush portion (11) from the joining portion of the joining member (4). The structure of the joining member (4) is a thread-like structure that can be expanded and contracted in the linear direction; a thin film / thin plate-like structure that can be expanded and contracted in the plane direction or can be deformed in the vertical direction; a coil-like structure; a deformable U-shape and a V-shape. , W-shaped, zigzag-like or wave-like cross-sections, compression-deformable sponge-like internal structures, and the like. Among these, a thin plate-like structure that can form a continuous joint surface, a deformable U-shaped, V-shaped, W-shaped, a structure having a zigzag-like or wave-like cross section, and a sponge-like internal structure that can be compressively deformed. A structure having a U-shape, a V-shape, a W-shape, and a structure having a zigzag-like or wave-like cross section is more preferable from the viewpoint of durability and energy efficiency, and a deformable U-shape, V-shape, A structure having a wave-like cross section is more preferable, and a structure having a deformable U-shaped or V-shaped cross section is most preferable. The phase difference of the motion of the flocking table (3) (the unit is mm in the moving distance, for example, in the case of reciprocating motion, it means the amplitude) is b, and the preferred structure of the joining member (4) is the flocking table ( When the phase difference in the case of maximum deformation of the joining member (4) in the direction of motion of 3) is a (unit is mm), the preferable range of a is 0.5 * b + 0.1 mm to 0.5 *. b + 1.0 mm.

In the present invention, by moving only the flocking table (3) without moving the outer shell body (8) of the replacement brush, the electric toothbrush is applied to the oral cavity portion other than the cleaning purpose while maintaining a high cleaning power in the oral cavity. An effect that makes it difficult to transmit vibration can be obtained. In order to move the flocking table (3) joined to the replacement brush outer shell (8) by the joining member (4), the drive transmission unit and the flocking table (3) are connected to the shaft (6) having an elongated shape as needed. It is connected by a motion conversion member having a motion conversion function. As a result, the movement of the drive transmission unit can be propagated to the flocking table (3) without affecting the outer shell body (8) of the replacement brush.

The means for connecting the drive transmission unit and the flocking table (3) by the shaft (6) is appropriately selected depending on what kind of movement the drive transmission unit and the flocking table (3) perform. Specifically, the motion pattern of the drive transmission unit is either a reciprocating vibration motion in the long axis direction of the electric toothbrush body (1) or a rotary motion with the long axis direction of the electric toothbrush body (1) as the rotation axis. The movement pattern of the hair-planting table (3) is the reciprocating motion of the replacement brush body (7) in the long axis direction, the swaying motion of the replacement brush body (7) with the long axis direction as the rotation axis, and the hair-planting table (3). ) Is either a rotational motion or a reversal motion with a vertical line to the horizontal plane as the axis of rotation, or a compound motion in which the above motions are combined. The connecting means that enables these combinations is not particularly limited. However, since the structure of the replacement brush can be further simplified and the size of the head portion of the replacement brush can be made smaller, it is preferable to propagate the motion of the drive transmission unit to the flocking table (3) without converting it. The most preferable combination is that the drive transmission unit reciprocates in the long axis direction of the electric toothbrush body, and the flocking table (3) reciprocates in the long axis direction of the replacement brush in conjunction with the reciprocating motion.

When the flocking table (3) performs an exercise linked to the shaft (6), the flocking table (3) and the shaft (6) can be directly joined without using a joining member, but the type and vibration of the movement. When the state of motion such as the number is different between the flocking table (3) and the shaft (6), they are joined via a conversion mechanism that converts the case. The conversion mechanism means a structure for converting the type of motion as shown in FIG. 7-9 of Japanese Patent Application No. 2016-101829, for example. The flocking table (3) joins with the shaft (6) or a conversion mechanism and moves at high speed, and in some cases, changes the direction of movement at high frequency. On the other hand, when cleaning the oral cavity, the filament (2) is used by pressing it against a cleaning site such as the tooth surface, so that the flocking table (3) receives stress from various directions when performing the above-mentioned exercise. However, since the flocking table (3) is a flat plate-like structure that mainly constitutes the brush portion of the toothbrush, smooth movement is likely to be hindered when stress is applied from other than the shaft or the like. In order to ensure smooth movement in this situation, the joining method between the flocking table (3) and the shaft or the like can be appropriately selected. For example, not only the method of fixing to the flocking table but also the method of not fixing to the flocking table as shown in FIG. 7-9 of Japanese Patent Application No. 2016-101829 can be adopted, and the joining point with the flocking table is not limited to one place. It may be joined at two or more places as shown in FIG. 8 of the specification. Further, as for the joining structure of the joining portion, a combination of a pin structure and a structure that encloses a hole structure or a pin tip structure (for example, a groove-like structure, a pot-shaped structure, etc.), a combination of uneven structures, and the like can be mentioned. Further, in the case of a combination of uneven structures, the cross-sectional shape can be appropriately selected from not only a substantially circular shape or a substantially elliptical shape but also a polygonal shape such as a triangle or a quadrangle or a teardrop shape. Further, the flocking table (3) and the shaft or the like can be selected to be fixed to each other. In the case of fixing, an adhesive or adhesion by melting can be used.

1 and 2 show an overall view of one aspect of the electric toothbrush of the present invention. The electric toothbrush is composed of an electric toothbrush main body (1) and a replacement brush main body (7), and both are joined to each other in the major axis direction as shown in the figure. In the brush portion (11) of the replacement brush body (7), the flocking table (3) made of synthetic resin in which the filament (2) is transplanted and the replacement brush outer shell (8) are bonded via the joining member (4). The joining member (4) having such a structure is in close contact with the flocking table (3) and the replacement brush outer shell (8) at all boundaries so as not to enter the inside of the brush portion (11) such as water. There is. When viewed from the side of the replacement brush body (7), in the embodiment shown in FIG. 2, the flocking table (3) is hidden behind the joining member (4) and cannot be visually recognized, but the arrangement and structure of the joining member (4) are changed. It can also be arranged so that it can be visually recognized by making it visible. The shape of the flocking table (3) is a substantially rectangular shape with a semicircular shape only on the side in the direction of the tip of the electric toothbrush, but the shape can be freely designed.

FIG. 3 shows a state in which the replacement brush body (7) is removed from the electric toothbrush shown in FIG. 1 and viewed from the front. The motion of the hair-implanting table (3) in the embodiment shown in FIG. 3 is a case of reciprocating motion in the long axis direction of the replacement brush body (7) or a swing motion centered on the ZZ axis (hair planting centered on the ZZ axis). It is possible to select one of the cases (rotational motion of slight forward / reverse rotation of the table).

FIG. 4 shows another aspect of the replacement brush main body (7) shown in FIG. The difference from FIG. 3 is that an opening (12) is provided in a part of the outer shell body (8) of the replacement brush. In the replacement brush body (7) shown in FIG. 4, the elongated shaft (6) connecting the flocking table (3) and the drive transmission unit can be visually recognized. The size of the opening and the arrangement in the replacement brush body can be freely designed, but when the opening (12) is provided, it is necessary to separately take measures to prevent water or the like from entering the inside of the brush portion (11). preferable.

FIG. 5 shows a state in which the replacement brush body (7) is removed from the electric toothbrush shown in FIG. 1 and viewed from the side surface. The fixed portion shown in 5 of FIG. 5 is a joint portion with the electric toothbrush main body (1). In this embodiment, after inserting the electric toothbrush main body, the long axis direction of the replacement brush main body (7) is changed as a rotation axis. A fixing method that can be fixed by rotating the brush body (7) is used. The replacement brush outer shell (8) is composed of two members as shown in the figure.

FIG. 6 shows a cross-sectional view of the replacement brush main body (7) in the ZZ line of FIG. In the embodiment shown in FIG. 6, the flocking table (3) reciprocates in the long axis direction of the replacement brush body (7). The flocking table (3) is joined by an annular joining member (4) having a U-shaped cross section. The shaft (6) is connected to the opposite side of the flocking surface of the flocking table (3), and the drive transmission part of the electric toothbrush body is inserted into the recess (10) provided at the end of the shaft (6). The movement is transmitted to the flocking table (3). In the embodiment shown in FIG. 3, the drive transmission unit is composed of a rod-shaped member that reciprocates in the longitudinal direction of the electric toothbrush main body (1).

FIG. 7 is an enlarged view of the head portion (11) of FIG. The annular joining member (4) having a U-shaped cross section is joined at the upper part of the side surface of the flocking table (3), but if it is difficult to obtain the joining strength, it may be joined over the entire side surface of the flocking table. .. Further, when the part of the flocking table or the outer shell of the replacement brush to be joined has a notched structure as shown in FIG. 7, the contact surface with the joining member (4) increases and the joining strength increases, which is more preferable. .. The inside of the U-shape is hollow.

On the surface of the flocking table (3) on the opposite side where the filament is flocked, the three convex structure shown in FIG. 8 is provided as a joint portion (12) with the shaft (6). The joint portion (12) may have a concave structure, but a convex structure is preferable in order to reduce the size of the toothbrush head portion. In FIG. 8, the shape of the convex portion is substantially columnar, but the convex portion having no round cross section can be used without any problem. In order to move the flocking table (3) smoothly, it is preferable to provide joints at three locations near the center of the flocking table (3) and near the left and right sides as shown in FIG. 8, and the size of the toothbrush head portion. In order to reduce the size of the flocking table (3), in the longitudinal direction of the electric toothbrush of the flocking table (3), one convex structure is provided near the center of the flocking table (3) on the tip side of the toothbrush, and the left and right sides of the flocking table are on the gripping part side of the toothbrush. It is preferable to provide a pair of convex structures near the side surfaces. In FIG. 8, the sizes of the cross-sectional areas of the three convex portions are almost the same, but they may be different. In addition, in order to improve the durability of the joined state between the flocking table (3) and the shaft (6), a replacement brush outer shell (8) is placed near the opposite side of the flocking table of the shaft (6) in contact with the joint (12). ) And a structure (15) having a contact surface are preferably provided. When the joint portion (12) near the central portion and the pair of joint portions (12) near the left and right side surfaces are separated from each other in the longitudinal direction of the electric toothbrush of the hair planting table (3), the plurality of structures (15). Will be provided near the site corresponding to each joint (12), or a uniform structure (15) will be formed by connecting them, but in that case, the stress due to friction during exercise will increase and the energy will be increased. Not preferable from the viewpoint of efficiency. As shown in FIG. 7, a pair of convex portions near the left and right side surfaces of the flocking table located on the side of the toothbrush grip is located near the center of the flocking table in the longitudinal direction of the electric toothbrush or in a region located at the tip of the electric toothbrush. By providing the structure (15), the number of the structures (15) can be reduced or the size can be reduced, so that the contact area with the replacement brush outer shell body (8) can be reduced. In addition, the energy loss can be further reduced by changing the portion on the outer shell body (8) side of the replacement brush in contact with the structure (15) to a plurality of small protrusion structures instead of the planar structure.

In the aspect of FIG. 7, a protrusion (13) is provided on the outer shell body (8) of the replacement brush, and a convex structure (14) is provided on the shaft (6). When the method of joining the shaft (6) and the drive transmission portion shown in FIG. 6 is adopted, when the replacement brush body (7) is removed from the electric brush body (1), the length of the electric toothbrush is longer than that of the shaft (6). Since a large stress is generated in the direction, the internal structure of the replacement brush may be damaged. Therefore, by providing this pair of structures, the movement of the shaft (6) is restricted, and the above-mentioned damage can be prevented. The means for regulating is not limited to the structure shown in FIG. 7, but as shown in FIGS. Even in this case, the end of the flocking table (3) in the direction of the electric toothbrush grip is supported by the surface of the convex structure (14) provided on the shaft (6), and the flocking table (3) is smoothly moved by moving on the surface. ) Exercise

1 Electric toothbrush body 2 Filament 3 Flocking table 4 Joining member 5 Fixed part 6 Shaft 7 Replacement brush body 8 Replacement brush outer shell body 9 Flocking hole 10 Recessed part to be joined to the electric toothbrush body drive transmission part 11 Brush part 12 Flocking table (3) 13 Joint with the shaft (6) 13 Projection of the replacement brush outer shell 14 Convex structure of the shaft (6) 15 Structure in contact with the replacement brush outer shell (8) of the shaft (6)

Claims (5)

The flocking table (3) on which the filament (2) is transplanted is oscillatingly joined to the replacement brush outer shell (8) via the joining member (4) capable of structural deformation.
The flocking table (3) and the drive transmission portion of the electric toothbrush body are connected by a shaft (6) so that the flocking table can swing with the movement of the drive unit of the electric toothbrush body.
The joining member is annular and the flocking table is arranged in a hollow portion, and the joining member is joined to the side surface of the flocking table.
The cross-sectional shape of the deformable joining member (4) along the plane orthogonal to the circumferential direction is U-shaped or V-shaped.
A replacement brush for electric toothbrushes that can be attached to and detached from the electric toothbrush body (1). The replacement brush for an electric toothbrush according to claim 1, wherein the deformable joining member (4) is made of an elastomer, rubber or silicone. The first or second claim, wherein the flocking table (3) and the drive transmission portion of the electric toothbrush body are connected by a shaft (6) so that the flocking table (3) reciprocates or reverses and reciprocates. Replacement brush for electric toothbrushes. The electric motor according to claim 3 , wherein the flocking table (3) and the electric toothbrush main body drive transmission unit are connected by a shaft (6) so that the flocking table (3) reciprocates in the long axis direction of the replacement brush. Replacement brush for toothbrush. When the distance between the U-shaped or V-shaped openings in the joining member (4) is a (mm) and the joining member (4) is maximally deformed in the direction of movement of the flocking table (3). The replacement brush for an electric toothbrush according to claim 4 , wherein the following formula holds when the amplitude of the flocking table (3) during movement is b (mm).
0.5 * b + 0.1≤a≤0.5 * b + 1.0

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