JP2022099983A - Replacement type toothbrush - Google Patents

Abstract

To provide a replacement type toothbrush in which a hand is unlikely to slip in a long axis direction when replacing a replaceable brush, a shaft part and a shaft insertion part are unlikely to stand out when fitting the replaceable brush, and which is hygienic.SOLUTION: In a replacement type toothbrush 1 provided with a brush body part 2 and a replaceable brush 3 freely removably fitted to an end side of the brush body part 2, the brush body part 2 is provided with a shaft part 5 extending from the end of a handle part 4 in a long axis direction, a groove-shaped shaft insertion part 16 is formed in a fitting part 6 of the replaceable brush 3, the replacement brush 3 is fitted to the brush body part 2 by the shaft part 5 being inserted from an opening on an outer peripheral surface 6a side of the fitting part 6 into a shaft insertion part 16, and at least a part of the shaft part 5 in the shaft insertion part 16 seen from the opening on the outer peripheral surface 6a side of the fitting part 6 is shielded by a shield part 9 in the state that the replaceable brush 3 is fitted to the brush body part 2.SELECTED DRAWING: Figure 5

Description

The present invention relates to a replaceable toothbrush.

In recent years, since environmental problems have become more serious, it has been required to reduce the amount of resin waste, and as for toothbrushes, replaceable toothbrushes that are used by exchanging the head portion have been proposed.
For example, the replacement brush can be detachably attached to the tip side of the brush body by inserting the shaft portion extending in the long axis direction from the tip of the brush body into the hole formed at the rear end of the replacement brush. A replaceable toothbrush is known (Patent Document 1).

Japanese Unexamined Patent Publication No. 2013-17670

However, with the replaceable toothbrush, the hand trying to pull out the replacement brush may slip in the long axis direction of the toothbrush when the replacement brush is replaced, and the hand may accidentally touch the head portion, which is unsanitary for the user. It is easy to feel.

As a mechanism that prevents the hand from slipping in the long axis direction when attaching and detaching the replacement brush, a groove-shaped shaft insertion portion that extends in the long axis direction and reaches the rear end is formed on the outer peripheral surface of the replacement brush from the tip of the brush body. A mechanism is conceivable in which the extending shaft portion is inserted into the shaft insertion portion through the opening on the outer peripheral surface side of the replacement brush and mounted. With such a mechanism, since the shaft portion is moved in the short axis direction when the replacement brush is replaced, the hand is less likely to slip in the long axis direction, and the hand is prevented from accidentally touching the head portion.
However, in the replaceable toothbrush that adopts this mechanism, the long groove-shaped shaft insertion part is easily noticeable even when the replacement brush is attached, and the shaft part inside the shaft insertion part can be seen from the opening on the outer peripheral surface side of the replacement brush. May feel unsanitary.

An object of the present invention is to provide a replaceable toothbrush having excellent hygiene, in which the hand does not slip easily in the long axis direction when the replacement brush is replaced, and the shaft portion and the shaft insertion portion are inconspicuous when the replacement brush is attached.

The present invention has the following aspects.
[1] A replaceable toothbrush including a brush main body and a replaceable brush that is detachably attached to the tip side of the brush main body.
The brush main body portion includes a handle portion and a shaft portion extending in the long axis direction from the tip of the handle portion.
The replacement brush includes a mounting portion to be mounted on the tip end side of the brush main body portion.
A groove-shaped shaft insertion portion that opens at the outer peripheral surface and the rear end surface of the mounting portion and extends in the long axis direction is formed in the mounting portion.
By inserting the shaft portion into the shaft insertion portion through the opening on the outer peripheral surface side of the mounting portion, the replacement brush is mounted on the brush main body portion.
A replaceable brush in which at least a part of the shaft portion in the shaft insertion portion is shielded by a shielding portion when the replacement brush is mounted on the brush main body portion and viewed from an opening on the outer peripheral surface side of the mounting portion. toothbrush.
[2] The shielding portion extends in the long axis direction from the tip of the handle portion, and is arranged on the outer peripheral surface side of the handle portion with respect to the shaft portion.
The replacement according to [1], wherein both the shield portion and the shaft portion are inserted into the shaft insertion portion, and the shaft portion is shielded by the shield portion when viewed from the opening on the outer peripheral surface side of the mounting portion. Ceremony toothbrush.
[3] The shielding portion and the shaft portion are connected to form a connecting body.
The replaceable toothbrush according to [2], wherein the replacement brush is mounted on the brush main body by inserting the connecting body into the shaft insertion portion through an opening on the outer peripheral surface side of the mounting portion.
[4] A recess is formed between at least one of the shielding portions on the distal end side and the side surface side of the connecting body and the shaft portion.
Inside the mounting portion, a leaf spring portion into which the shaft portion inserted into the shaft insertion portion is fitted is provided.
The replaceable toothbrush according to [3], wherein the shaft portion of the portion of the connecting body inserted into the shaft insertion portion where the recessed portion is formed is fitted into the leaf spring portion.
[5] The recessed portion is formed between the shielding portion on the tip end side of the connecting body and the shaft portion, and the tip end portion of the shaft portion is fitted into the leaf spring portion, according to [4]. Replaceable toothbrush.
[6] A leaf spring portion into which the shaft portion inserted into the shaft insertion portion is fitted is provided inside the mounting portion.
The leaf spring portion includes a pair of spring pieces that surround the shaft portion from both sides when viewed from the long axis direction.
The replaceable toothbrush according to [1], wherein the pair of spring pieces serves as the shielding portion and shields at least a part of the shaft portion when viewed from the opening on the outer peripheral surface side of the mounting portion.
[7] The pair of spring pieces have facing surfaces that are parallel to each other in the radial direction from the opening on the outer peripheral surface side of the mounting portion toward the central axis and face each other.
The replaceable toothbrush according to [6], wherein the length of the facing surface is larger than the length of the shaft portion in the radial direction.
[8] The interchangeable type according to [6], wherein at least one of the pair of spring pieces has an inclined surface that approaches the other spring piece from the tip end to the proximal end when viewed from the long axis direction. toothbrush.

According to the present invention, it is possible to provide a replaceable toothbrush having excellent hygiene, in which the hand does not slip easily in the long axis direction when the replacement brush is replaced, and the shaft portion and the shaft insertion portion are inconspicuous when the replacement brush is attached.

It is a front view of the exchangeable toothbrush of 1st Embodiment. It is a side view of the replaceable toothbrush of FIG. 1A is a view showing a replacement brush of the replaceable toothbrush of FIG. 1, FIG. 3A is a front view, FIG. 3B is a side view, and FIG. 3C is a bottom view. FIG. 3 is an enlarged perspective view showing a shaft portion of a brush body portion of the replaceable toothbrush of FIG. 1. It is a front view which showed the state which the replacement brush is attached to the brush main body part in the exchangeable toothbrush of FIG. FIG. 3 is a sectional view taken along the line AA of the replaceable toothbrush of FIG. It is sectional drawing of the mounting part of the exchangeable toothbrush of another embodiment. It is an enlarged perspective view which showed the shaft part of the brush main body part of the exchangeable toothbrush of another embodiment. It is sectional drawing of the attachment part with the replacement brush attached to the brush body part of FIG. It is an enlarged perspective view which showed the shaft part of the brush main body part of the exchangeable toothbrush of another embodiment. It is a front view of the exchangeable toothbrush of 2nd Embodiment. 11 is an enlarged perspective view showing a shaft portion of a brush body portion of the replaceable toothbrush of FIG. 11. 11 is a sectional view taken along the line BB of the replaceable toothbrush of FIG. FIG. 11 is an enlarged side view showing a view of the shaft insertion portion of the replaceable toothbrush of FIG. 11 from the opening side. It is sectional drawing of the mounting part of the exchangeable toothbrush of another embodiment.

Hereinafter, an example of an embodiment of the replaceable toothbrush of the present invention will be described with reference to the drawings. It should be noted that the following embodiments show one aspect of the present invention, do not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. Further, in the following drawings, in order to make each configuration easy to understand, the scale and number of each structure are different from the actual structure.

[First Embodiment]
As shown in FIGS. 1 and 2, the replaceable toothbrush 1 of the first embodiment includes a brush main body portion 2 and a replacement brush 3 detachably attached to the tip end side of the brush main body portion 2. ..

As shown in FIGS. 1, 2 and 3 (A) to 3 (C), the replacement brush 3 is provided on the mounting portion 6 mounted on the tip side of the brush main body 2 and on the tip side of the mounting portion 6. The head portion 7 is provided, and the neck portion 8 for connecting the head portion 7 and the mounting portion 6 is provided. In the replaceable toothbrush 1, the hair bundle 12 is planted in the plurality of flocked holes 10 formed in the flocked surface 7a of the head portion 7 to form the flocked portion 14, so that the tooth can be brushed. ..

In the following description, the side of the head portion 7 where the flocked surface 7a is provided (the flocked surface side) is the front side of the replaceable toothbrush 1, and the side of the head portion 7 opposite to the side facing the flocked surface 7a is the replaceable toothbrush. It is the back side of 1.
In addition, the direction in which the brush body 2 extends is the major axis direction.
The direction perpendicular to the major axis direction and toward the bottom from the opening on the outer peripheral surface 6a side of the mounting portion 6 in the shaft insertion portion 16 described later is defined as the minor axis direction.
The direction parallel to the flocked surface 7a and orthogonal to the long axis direction is defined as the width direction of the interchangeable toothbrush 1.
The direction orthogonal to the flocked surface 7a is the thickness direction of the replaceable toothbrush 1.
Further, the side where the replacement brush 3 is provided is the front end side, and the side where the brush main body 2 is provided is the rear end side.

(Head part 7)
In the replacement brush 3 of this example, a head portion 7 having a substantially rectangular shape in front view is provided on the tip end side of the columnar mounting portion 6 via the neck portion 8.
The boundary P1 (not shown) between the head portion and the neck portion is the end point of the curve forming the corner cut near the neck portion 8 in the plan view shape of the head portion 7, that is, the bending direction of the curve forming the corner cut. It is a changing position. That is, the boundary P1 between the head portion and the neck portion is a curve or a straight line or a width that widens from a curve or a straight line forming both edges in which the width of the corner cut portion near the neck portion in the head portion in a plan view is narrowed. Is the position where is changed to the same straight line.

The shape of the head portion 7 is not limited to a substantially rectangular shape in front view, and a known shape can be adopted without limitation. The dimensions of the head portion 7 can be appropriately set, and for example, the length can be 10 mm or more and 33 mm or less, the width can be 7 mm or more and 13 mm or less, and the thickness can be 2 mm or more and 5 mm or less.

The mode in which the hair follicle 12 is planted in the flocked hole 10 formed in the flocked surface 7a of the head portion 7 is not particularly limited. For example, an embodiment in which a plurality of hair follicles (filaments) are bundled and folded in half, and a metal retaining tool (not shown) called a flat wire is sandwiched between them and driven into the hair follicle hole 10 can be exemplified.

The number of hair follicles 10 is not particularly limited, and may be, for example, 10 or more and 40 or less. The arrangement pattern of the hair follicle holes 10 is not particularly limited and can be appropriately designed.
The diameter of the hair follicle hole 10 can be appropriately set, and can be, for example, 1.2 mm or more and 3.0 mm or less.

The hairs constituting the hair bundle 12 are not particularly limited, and examples thereof include straight hairs, hairs whose diameter gradually decreases toward the tips (tapered hairs), and tip branch hairs. The material of the hair is not particularly limited, and examples thereof include polyamide, polybutylene terephthalate, polytrimethylene terephthalate, polyolefin (polypropylene and the like), styrene-based elastomer, polyester-based elastomer, and polyurethane-based elastomer.
The size of the hair can be appropriately set, and for example, the hair length can be 6 mm or more and 13 mm or less, and the hair diameter can be 4 mil or more and 13 mil or less.

(Neck 8)
The shape of the neck portion 8 is not particularly limited, and a known shape can be adopted without limitation.
The neck portion 8 connecting the head portion 7 and the mounting portion 6 extends from the boundary P1 between the head portion and the neck portion toward the mounting portion 6 with substantially the same diameter, and then expands in diameter to the boundary P2 with the mounting portion 6 ( (Not shown). The boundary P2 is the end point of the diameter expansion of the neck portion 8, that is, the end point of the straight line forming both edges of the widening portion or the position where the bending direction of the curve forming both edges of the widening portion changes in a plan view. Is. In FIG. 1, the boundary P2 between the neck portion and the handle portion is a position where the straight line or the curved line forming both edges of the widened portion in the neck portion in a plan view changes to a curved line whose width gradually narrows. ..

The dimensions of the neck portion 8 can be appropriately set, and for example, the length can be 40 mm or more and 70 mm or less, the width can be 3 mm or more and 5 mm or less, and the thickness can be 3 mm or more and 5 mm or less.

(Mounting part 6)
The mounting portion 6 is not limited to a columnar shape, and may be, for example, a truncated cone shape or the like.
In the replaceable toothbrush 1, a groove-shaped shaft insertion portion 16 that opens at the outer peripheral surface 6a and the rear end surface 6b of the mounting portion 6 and extends in the long axis direction is formed in the mounting portion 6 of the replacement brush 3. In this example, the shaft insertion portion 16 is formed so as to open the replacement brush 3 on the outer peripheral surface 6a of the mounting portion 6 to the side surface side when viewed from the front side. The shaft insertion portion 16 may be formed so as to open on the front side or the back side of the outer peripheral surface 6a of the mounting portion 6.

(Axis insertion part 16)
As shown in FIGS. 1 and 2, the shaft insertion portion 16 has a groove shape that internally receives the shaft portion 5 and the shielding portion 9 of the brush main body portion 2, which will be described later.
The length of the shaft insertion portion 16 in the major axis direction may be a length that allows the shaft portion 5 and the shielding portion 9 to be internally received, and the shaft insertion portion 16 and the shaft portion 5 are inconspicuous when the replacement brush 3 is attached. Therefore, the same length as the length of the shielding portion 9 is preferable.
The length of the shaft insertion portion 16 in the major axis direction is preferably 5 mm or more and 40 mm or less, and more preferably 10 mm or more and 25 mm or less.

The length of the shaft insertion portion 16 in the direction perpendicular to the minor axis direction when viewed from the major axis direction is L1 as shown in FIG. 3B, and the length of the shaft insertion portion 16 in the minor axis direction, that is, the shaft insertion portion 16 The depth from the opening on the outer peripheral surface 6a side of the mounting portion 6 toward the bottom is L2 as shown in FIG. 3A. At this time, L1 and L2 have a relationship of L1 <L2.
L1 may have a length that allows the shaft portion 5 and the shielding portion 9 to be internally received, and the shaft insertion portion 16 and the shaft portion 5 are inconspicuous when the replacement brush 3 is attached. It is preferable that the length is the same as the length in the direction perpendicular to the minor axis direction of 9.
L2 may have a length that can accept both the shaft portion 5 and the shielding portion 9, and is preferably a length that reaches from the outer peripheral surface 6a of the mounting portion 6 to the central axis.

As the resin constituting the mounting portion 6, the head portion 7, and the neck portion 8, only the hard resin may be used, only the soft resin may be used, or both the hard resin and the soft resin may be used. From the viewpoint of suppressing the amount of bending during brushing, it is preferable to use only a hard resin as the resin constituting the mounting portion 6, the head portion 7, and the neck portion 8. The resin constituting the mounting portion 6, the head portion 7, and the neck portion 8 may be one type or two or more types.

Examples of the hard resin include polypropylene (PP), polyacetal (POM), polycyclohexylene methylene terephthalate (PCT), polyethylene terephthalate (PET), polycarbonate (PC), acrylonitrile-butadiene-styrene resin (ABS), and polymethyl. Methacrylate (PMMA) can be exemplified. Further, a biodegradable resin, a plant-derived resin, a paper-blended resin, a plant-blended resin and the like may be used. Among them, PP is preferable in terms of excellent moldability and cost advantage.
Examples of the soft resin include olefin-based elastomers, styrene-based elastomers, polyester-based elastomers, and polyurethane-based elastomers.

As shown in FIG. 6, inside the mounting portion 6, a leaf spring portion 30 into which a shaft portion 5 to be described later inserted into the shaft inserting portion 16 is fitted is provided.
The leaf spring portion 30 includes a base portion 31 and a pair of spring pieces 32, 33 protruding from the base portion 31. When viewed from the long axis direction, the base portion 31 of the leaf spring portion 30 is located on the side opposite to the opening side of the bottom of the shaft insertion portion 16. Further, the pair of spring pieces 32 and 33 each project from the base portion 31 toward the opening side of the shaft insertion portion 16 in an arc shape, and their tip portions thereof are axially inserted from the inner wall surfaces on both sides of the shaft insertion portion 16 facing each other. It protrudes into the part 16.

The minimum thickness of each of the opening side (tip portion) of the shaft insertion portion 16 of the spring pieces 32 and 33 is preferably 0.5 mm or more and 4.0 mm or less, and more preferably 1.0 mm or more and 2.5 mm or less. When the minimum thickness of the spring pieces 32 and 33 is equal to or greater than the lower limit of the above range, the holding force of the shaft portion 5 is sufficient, and it is easy to prevent the replacement brush 3 from unexpectedly coming off during use. When the minimum thickness of the spring pieces 32, 33 is equal to or less than the upper limit of the above range, the elasticity of the spring pieces 32, 33 is sufficient, and it becomes easy to fit the shaft portion 5 into the leaf spring portion 30.

(Brush body 2)
As shown in FIGS. 1, 2 and 4, the brush main body 2 includes a handle 4 and a shaft 5 extending in the long axis direction from the tip 4a of the handle 4.
Further, the brush main body 2 extends from the tip 4a of the handle 4 in the long axis direction, and has a shielding portion 9 arranged on the outer peripheral surface 4b side of the handle 4 with respect to the shaft 5 when viewed from the tip side. Further prepared.
In the replaceable toothbrush 1, as shown in FIG. 4, the shielding portion 9 extending to the tip end side of the handle portion 4 and the shaft portion 5 are connected by the connecting portion 18 to form the connecting body 20.

As shown in FIG. 5, when the replacement brush 3 is attached to the tip side of the brush main body 2, the replacement brush 3 and the brush main body 2 are moved so as to be close to each other in the minor axis direction, and the shaft portion 5 is attached. It is inserted into the shaft insertion portion 16 through the opening on the outer peripheral surface 6a side of the portion 6. At this time, as shown in FIGS. 1 and 2, the connecting body 20 is inserted into the shaft insertion portion 16 from the shaft portion 5 side. That is, both the shaft portion 5 and the shielding portion 9 are inserted into the shaft insertion portion 16 so that the shaft portion 5 is on the central shaft side (bottom side) of the shaft insertion portion 16. With the replacement brush 3 attached to the tip side of the brush main body 2, the central axis of the brush main body 2 and the central axis of the replacement brush 3 coincide with each other. Further, with the replacement brush 3 mounted on the tip side of the brush body 2, the shaft portion 5 is located at the bottom of the shaft insertion portion 16 as seen from the opening on the outer peripheral surface 6a side of the mounting portion 6. preferable.

When removing the replacement brush 3, the replacement brush 3 and the brush main body 2 are moved so as to be separated from each other in the short axis direction, and are pulled out from the shaft insertion portion 16 through the opening on the outer peripheral surface 6a side of the mounting portion 6. As described above, in the replaceable toothbrush 1, when the replacement brush 3 is replaced, the replacement brush 3 and the brush main body 2 are moved in the short axis direction. Therefore, there is no operation of pulling out the replacement brush 3 from the brush main body 2 in the long axis direction at the time of replacement, and the hand holding the replacement brush 3 does not slip easily in the long axis direction, so that the hand is prevented from accidentally touching the head portion 7. To.

In the state where the replacement brush 3 is attached to the brush main body 2, the shielding portion 9 is located in the shaft insertion portion 16 on the opening side of the shaft portion 5. Therefore, when viewed from the opening on the outer peripheral surface 6a side of the mounting portion 6, at least a part of the shaft portion 5 in the shaft insertion portion 16 is shielded by the shielding portion 9, and the shaft portion 5 becomes inconspicuous. Further, since the portion of the shaft insertion portion 16 on the opening side of the shaft portion 5 is filled with the shielding portion 9, the shaft insertion portion 16 is also less noticeable. From these things, it is easy for the user to feel that the replaceable toothbrush 1 is hygienic.

(Shaft part 5)
The shaft portion 5 of this example is cylindrical and is provided at the tip 4a of the handle portion 4 so as to coincide with the central axis of the handle portion 4. The shape of the shaft portion 5 is not limited to a columnar shape as long as the replacement brush 3 can be attached to the brush main body portion 2 by inserting it into the shaft insertion portion 16, and may be, for example, a square columnar shape. The position of the shaft portion 5 at the tip 4a of the handle portion 4 is not limited to a position that coincides with the central axis of the handle portion 4, and may deviate from the central axis.

The length of the shaft portion 5 in the major axis direction is preferably 5 mm or more and 40 mm or less, and more preferably 10 mm or more and 25 mm or less. If the length of the shaft portion 5 in the long axis direction is equal to or greater than the lower limit of the above range, the holding force between the brush main body portion and the replacement brush becomes weak, and the brush portion 5 is likely to come off during use. If the length of the shaft portion 5 in the major axis direction is equal to or less than the upper limit of the above range, it becomes difficult to fit the replacement brush into the brush main body portion.

The length of the connecting body 20 in the short axis direction is L3 as shown in FIG. 4, and the length of the shaft portion 5 viewed from the long axis direction in the direction perpendicular to the short axis direction is L4 as shown in FIG. .. At this time, L3 and L4 have a relationship of L4 <L3.
L3 is preferably more than 1.0 mm and 10 mm or less. When L3 is equal to or more than the lower limit of the above range, the holding force between the brush main body and the replacement brush becomes weak, and the brush easily comes off during use. If L3 is not more than the upper limit of the above range, it becomes difficult to fit the replacement brush into the brush main body.
L4 is preferably 1.0 mm or more and 5.0 mm or less, and more preferably 1.5 mm or more and 3.5 mm or less.
Further, from the viewpoint of insertability and fixation after insertion, the relationship between L1 and L4 is preferably L1 ≧ L4, and the relationship between L2 and L3 is preferably L2 ≧ L3.

(Shielding part 9)
The shielding portion 9 of this example has a columnar shape, and is provided so that the outer peripheral surface of the shielding portion 9 coincides with the outer peripheral surface 4b of the handle portion 4 in a plan view from the tip side. The shape of the shielding portion 9 is not limited to a columnar shape as long as the shaft portion 5 can be shielded while being inserted into the shaft inserting portion 16, and may be, for example, a square columnar shape.

The position of the shielding portion 9 at the tip end 4a of the handle portion 4 may be on the outer peripheral surface 4b side of the handle portion 4 with respect to the shaft portion 5, and the shaft insertion portion 16 is inconspicuous. The closer it is, the better. The position of the shielding portion 9 may be located closer to the center of the outer peripheral surface 4b of the handle portion 4.

The length of the shielding portion 9 in the major axis direction is preferably the same as the length in the major axis direction of the shaft portion 5 or longer than the shaft portion 5 in the range that can be inserted into the shaft insertion portion 16. As a result, the shaft portion 5 in the shaft insertion portion 16 is shielded by the shielding portion 9, so that the shaft portion 5 becomes inconspicuous.
The length of the shielding portion 9 in the minor axis direction is preferably the same as the length in the minor axis direction of the shaft portion 5 or larger than the length in the minor axis direction of the shaft portion 5 within the range that can be inserted into the shaft insertion portion 16. .. The length of the shielding portion 9 in the direction perpendicular to the minor axis direction when viewed from the major axis direction is the same as the length L4 of the shaft portion 5 or the length L4 of the shaft portion 5 within the range in which it can be inserted into the shaft insertion portion 16. Is preferably larger than. As a result, the shaft portion 5 in the shaft insertion portion 16 is shielded by the shielding portion 9, so that the shaft portion 5 becomes inconspicuous.

As shown in FIG. 7, in the replaceable toothbrush 1, the shape of the opening side when inserted into the shaft insertion portion 16 on the outer peripheral surface 9a of the shielding portion 9 has a shape that follows the shape of the outer peripheral surface 6a of the mounting portion 6. It is preferable that there is no step between the outer peripheral surface 9a of the shielding portion 9 and the outer peripheral surface 6a of the mounting portion 6 with the replacement brush 3 mounted, and the shaft insertion portion 16 is completely filled. As a result, the shaft insertion portion 16 becomes less noticeable with the replacement brush 3 attached, and the user feels that the replaceable toothbrush 1 is more hygienic.

(Connecting part 18)
As shown in FIG. 4, in the long axis direction, the length of the connecting portion 18 in the long axis direction is shorter than the length of the shaft portion 5 and the shielding portion 9 in the long axis direction, and is on the tip end side of the connecting portion 20. A recessed portion 22 is formed between the shielding portion 9 and the shaft portion 5. Further, the length of the connecting portion 18 in the direction perpendicular to the short axis direction seen from the long axis direction is the direction perpendicular to the short axis direction of the length L4 of the shaft portion 5 and the shielding portion 9 seen from the long axis direction. A recess 24 extending in the long axis direction is formed between the shielding portion 9 on the side surface side of the connecting body 20 and the shaft portion 5.

As shown in FIG. 6, in the portion of the connecting body 20 where the recess 22 is formed, the tip portion of the shaft portion 5 exists independently, and the tip portion of the shaft portion 5 is inside the shaft insertion portion 16. It is fitted in the leaf spring portion 30. As a result, the shaft portion 5 is unlikely to come off from the shaft insertion portion 16, so that the replacement brush 3 can be stably attached. In the replaceable toothbrush 1, since the recess 22 is formed on the tip side of the connecting body 20, the tip portion of the shaft portion 5 is firmly surrounded and held by the pair of spring pieces 32, 33 of the leaf spring portion 30. Therefore, the mounting state of the replacement brush 3 becomes more stable.

In FIG. 4, the difference in length between the shaft portion 5 and the connecting portion 18 in the major axis direction ΔH, that is, the depth of the recessed portion 22 is preferably 20 mm or less, more preferably 10 mm or more and 15 mm or less. If the difference ΔH between the lengths of the shaft portion 5 and the connecting portion 18 is equal to or less than the upper limit of the above range, the leaf spring portion 30 can easily hold the shaft portion 5. When the difference ΔH between the lengths of the shaft portion 5 and the connecting portion 18 is equal to or greater than the lower limit of the above range, the holding force of the shaft portion 5 by the leaf spring portion 30 is improved, and the mounting state of the replacement brush 3 is more stable. Become.

As the resin constituting the brush main body 2, only the hard resin may be used, only the soft resin may be used, or both the hard resin and the soft resin may be used. From the viewpoint of suppressing the amount of bending during brushing, it is preferable to use only a hard resin as the resin constituting the brush main body 2. In particular, a hard resin is preferable as the resin constituting the shielding portion 9, the shaft portion 5, and the connecting portion 18. The resin constituting the brush main body 2 may be one type or two or more types.

The color of the shielding portion 9 is preferably the same as the color of the mounting portion 6. As a result, the shaft insertion portion 16 becomes less noticeable with the replacement brush 3 attached, so that the user can easily feel that it is hygienic.

The method for manufacturing the replaceable toothbrush 1 is not particularly limited. For example, as the molding method of the brush main body portion 2, the mounting portion 6, the neck portion 8 and the head portion 7 of the replacement brush 3, injection molding and blow molding can be exemplified, and injection molding is preferable. As the injection molding runner, a cold runner may be used, a hot runner may be used, and a hot runner is preferable. The injection-molded gate is not particularly limited, and for example, a direct gate can be exemplified.

As described above, in the replaceable toothbrush 1, when the replacement brush 3 is replaced, the replacement brush 3 and the brush main body 2 are moved in the short axis direction to be attached and detached, so that the replacement brush 3 is moved from the brush main body 2 to the long axis. There is no action to pull out in the direction. Therefore, when the replacement brush 3 is replaced, the hand holding the replacement brush 3 does not easily slip in the long axis direction, so that it is possible to prevent the hand from accidentally touching the head portion 7. Further, in the state where the replacement brush 3 is attached to the brush main body portion 2, the shielding portion 9 is located on the opening side of the shaft portion 5 in the shaft insertion portion 16. Therefore, when viewed from the opening on the outer peripheral surface 6a side of the mounting portion 6, at least a part of the shaft portion 5 in the shaft insertion portion 16 is shielded by the shielding portion 9, and the shaft portion 5 of the shaft insertion portion 16 The portion on the opening side is filled with the shielding portion 9. As a result, the shaft portion 5 and the shaft insertion portion 16 become inconspicuous when the replacement brush 3 is attached, so that the user feels that the replaceable toothbrush 1 is hygienic.

The replaceable toothbrush of the first embodiment is not limited to the above-mentioned replaceable toothbrush 1.
For example, a recess may be formed only on one of the tip end side and the side surface side of the connecting body in which the shaft portion and the shielding portion are connected. Specifically, for example, as shown in FIG. 8, the shaft portion 5 and the shielding portion 9 are connected by a connecting portion 18A having the same length as them, and only the portion between the shaft portion 5 and the shielding portion 9 on the side surface side is connected. The brush main body portion 2 may be provided with a connecting body 20A having a recessed portion 24 formed therein. In the case of the connecting body 20A as well, as in the case of the connecting body 20, the shaft portion 5 and the shaft insertion portion 16 become inconspicuous with the replacement brush 3 attached, so that the user can hygienically use the replaceable toothbrush 1. I feel.

As shown in FIG. 9, also in this embodiment, by fitting the shaft portion 5 into the leaf spring portion 30 at the portion where the recessed portion 24 of the connecting body 20A is formed, the replacement brush 3 can be stably held by the brush main body portion 2. Can be attached to. In the connecting body 20A, the recessed portion 24 is entirely formed from the front end to the rear end in the long axis direction, but the recessed portion on the side surface side of the connecting body is partially formed in the long axis direction. good.

The connecting body in which the shaft portion and the shielding portion are connected may not have a recessed portion on either the tip side or the side surface side. For example, as shown in FIG. 10, a flat connecting body 20B in which the shaft portion 5 and the shielding portion 9 are connected and integrated may be used. In the case of the connecting body 20B as well, as in the case of the connecting body 20, the shaft portion 5 and the shaft insertion portion 16 become inconspicuous with the replacement brush 3 attached, so that the user can hygienically use the replaceable toothbrush 1. I feel.

As shown in FIG. 10, the ratio of the length L in the direction orthogonal to the short axis direction to the minimum value D of the length in the short axis direction of the coupling 20B is preferably 1.0 or more and 10 or less, preferably 1.3. More than 4.6 or less is more preferable. When the ratio is equal to or higher than the lower limit of the range, the holding force between the brush main body and the replacement brush becomes weak, and the brush easily comes off during use. If the ratio is not more than the upper limit of the range, it becomes difficult to fit the replacement brush into the brush main body.
The length of L may be the same as that of L3 described above, and the length of D may be the same as that of L4.

[Second Embodiment]
As shown in FIG. 11, the replaceable toothbrush 41 of the second embodiment includes a brush main body portion 42 and a replacement brush 43 that is detachably attached to the tip end side of the brush main body portion 2.

As shown in FIG. 12, the brush main body 42 does not include the shielding portion 9 and the connecting portion 18, and the brush main body of the first embodiment is provided except that only the shaft portion 5 is provided at the tip 4a of the handle portion 4. It is the same aspect as the part 2.
As shown in FIGS. 11 and 13, the replacement brush 43 is provided with a leaf spring portion 50 into which the shaft portion 5 inserted into the shaft insertion portion 16 is fitted instead of the leaf spring portion 30. It is the same embodiment as the replacement brush 3 of the first embodiment. The same parts as those in FIGS. 1, 4 and 6 in FIGS. 11 to 13 are designated by the same reference numerals and the description thereof will be omitted.

The leaf spring portion 50 includes a base portion 51 and a pair of spring pieces 52, 53. The base portion 51 is a columnar shape extending in the long axis direction, and is located on the side opposite to the opening side of the bottom of the shaft insertion portion 16 when viewed from the long axis direction. Each of the pair of spring pieces 52 and 53 has a plate shape extending in the long axis direction, and protrudes in an arc shape from the base portion 51 to the opening side of the shaft insertion portion 16 when viewed from the long axis direction, and their tip portions thereof. It protrudes into the shaft insertion portion 16 from the inner wall surfaces on both sides of the shaft insertion portion 16 facing each other.

In the replaceable toothbrush 41, similarly to the replaceable toothbrush 1, the shaft portion 5 is inserted into the shaft insertion portion 16 from the opening on the outer peripheral surface 6a side of the mounting portion 6 to replace the shaft portion 5 with the tip end side of the brush main body portion 42. The brush 43 is attached. As shown in FIG. 13, in a state where the replacement brush 43 is attached to the tip end side of the brush main body portion 42, the shaft portion 5 inserted into the shaft insertion portion 16 is fitted into the leaf spring portion 50. When removing the replacement brush 43, the replacement brush 43 is moved so as to be separated from the brush main body 42 in the short axis direction, and the shaft portion 5 is detached from the leaf spring portion 50 and pulled out to the outside of the shaft insertion portion 16. ..

As described above, in the replaceable toothbrush 41, similarly to the replaceable toothbrush 1, there is no operation of pulling out the replacement brush 43 from the brush main body 42 in the long axis direction at the time of replacement, and the hand holding the replacement brush 43 slides in the long axis direction. Since it is difficult, it is possible to prevent the hand from accidentally touching the head portion 7. Further, as shown in FIGS. 13 and 14, in the state where the replacement brush 3 is attached, the pair of spring pieces 52 and 53 surround the shaft portion 5 of the shaft insertion portion 16 from both sides, and the shaft insertion portion 16 The tip portions of the pair of spring pieces 52, 53 are located on the opening side of the shaft portion 5. The tip portions of the pair of spring pieces 52 and 53 function as shielding portions 9A and 9A, and when viewed from the opening on the outer peripheral surface 6a side of the mounting portion 6, at least a part of the shaft portion 5 in the shaft insertion portion 16 is formed. It is shielded by the shielding portions 9A and 9A, and the shaft portion 5 becomes inconspicuous. Further, since the portion of the shaft insertion portion 16 on the opening side of the shaft portion 5 is filled with the shielding portions 9A and 9A, the shaft insertion portion 16 is also less noticeable. From these things, the user feels that the replaceable toothbrush 41 is hygienic.

Since the shaft portion 5 is inconspicuous when viewed from the opening on the outer peripheral surface 6a side of the mounting portion 6, the length of the pair of spring pieces 52, 53 of the leaf spring portion 50 in the major axis direction is the length of the shaft portion 5. It is preferably equal to or longer than the axial length.

In the leaf spring portion 50 of this example, the facing surface 52a of the spring piece 52 facing the spring piece 53 side and the facing surface 53a of the spring piece 53 facing the spring piece 52 side are both on the outer peripheral surface 6a side of the mounting portion 6. It is parallel to the radial direction from the opening to the central axis.
Further, as shown in FIG. 13, the maximum length in the minor axis direction of the parallel facing surfaces 52a, 53a of the pair of spring pieces 52, 53 in the radial direction from the opening on the outer peripheral surface 6a side of the mounting portion 6 toward the central axis. D1 is larger than the maximum length d2 of the shaft portion 5 in the minor axis direction.

The ratio (d1 / d2) of the maximum length d1 in the minor axis direction of the parallel facing surfaces 52a, 53a of the pair of spring pieces 52, 53 to the maximum length d2 in the minor axis direction of the shaft portion 5 is 1.5. More than 9.0 is preferable, and 2.0 or more and 4.6 or less are more preferable. When d1 / d2 is equal to or greater than the lower limit of the above range, it becomes difficult to visually recognize the shaft portion 5 when viewed from the opening on the outer peripheral surface 6a side of the mounting portion 6, so that the user can easily feel that it is hygienic. When d1 / d2 is equal to or less than the upper limit of the above range, it becomes easy to fit the shaft portion 5 into the leaf spring portion 50.
The d1 is preferably 1.5 mm or more and 9.0 mm or less, and more preferably 3.0 mm or more and 7.0 mm or less.
d2 is preferably 1.0 mm or more and 5.0 mm or less, and more preferably 1.5 mm or more and 3.5 mm or less.

The ratio (d4 / d3) of the distance d4 between the facing surface 52a of the spring piece 52 and the facing surface 53a of the spring piece 52 with respect to the maximum length d3 in the direction perpendicular to the short axis direction of the shaft portion 5 as viewed from the major axis direction. Is preferably 0.1 or more and 0.5 or less, and more preferably 0.2 or more and 0.4 or less. When d4 / d3 is equal to or less than the upper limit of the above range, it becomes difficult to visually recognize the shaft portion 5 when viewed from the opening on the outer peripheral surface 6a side of the mounting portion 6, so that the user can easily feel that it is hygienic. When d4 / d3 is equal to or higher than the lower limit of the above range, it becomes easy to fit the shaft portion 5 into the leaf spring portion 50.
d3 is preferably 1.0 mm or more and 5.0 mm or less, and more preferably 1.5 mm or more and 3.5 mm or less.
The d4 is preferably 0.5 mm or more and 2.5 mm or less, and more preferably 0.6 mm or more and 2.0 mm or less.

The minimum thickness of the spring pieces 52 and 53 viewed from the long axis direction is preferably 0.5 mm or more and 4.0 mm or less, and more preferably 1.5 mm or more and 3.5 mm or less. When the minimum thickness of the spring pieces 52 and 53 is equal to or greater than the lower limit of the above range, the holding force of the shaft portion 5 is sufficient, and it is easy to prevent the replacement brush 43 from unexpectedly coming off during use. When the minimum thickness of the spring pieces 52 and 53 is equal to or less than the upper limit of the above range, the elasticity of the spring pieces 52 and 53 is sufficient, and it becomes easy to fit the shaft portion 5 into the leaf spring portion 50.

As described above, in the replaceable toothbrush 41, as in the case of the replaceable toothbrush 1, the hand holding the replacement brush 43 does not easily slip in the long axis direction when the replacement brush 43 is replaced, so that the hand accidentally touches the head portion 7. Is suppressed. Further, since the tip portions of the pair of spring pieces 52, 53 of the leaf spring portion 50 serve as shielding portions 9A, 9A to shield the shaft portion 5, the shaft portion 5 and the shaft insertion portion 16 become inconspicuous, and the user can use them. I feel hygienic.

The replaceable toothbrush of the second embodiment is not limited to the above-mentioned replaceable toothbrush 41. For example, as shown in FIG. 15, a replacement brush 43 provided with the leaf spring portion 50A may be used instead of the leaf spring portion 50. The leaf spring portion 50A includes a pair of spring pieces 54, 55 instead of the pair of spring pieces 52, 53.

Seen from the major axis direction, the spring piece 54 has a tip-side inclined surface 54a that approaches the other spring piece 55 as it goes from the tip to the proximal end. Further, the spring piece 54 has a base side inclined surface 54b that moves away from the other spring piece 55 toward the base 51 from the rear end of the tip side inclined surface 54a. Similarly, the spring piece 55 has a tip-side inclined surface 55a that approaches the other spring piece 54 as it goes from the tip to the proximal end. Further, the spring piece 55 has a base-side inclined surface 55b that moves away from the other spring piece 54 toward the base 51 from the rear end of the tip-side inclined surface 55a.

Except when the replacement brush 43 is attached / detached, the rear end of the tip-side inclined surface 54a of the spring piece 54 and the rear end of the tip-side inclined surface 55a of the spring piece 55 are in contact with each other, and the leaf spring portion 50A is in a closed state. ing. That is, the pair of tip-side inclined surfaces 54a and the tip-side inclined surfaces 55a serve as shielding portions 9B and 9B to shield the shaft portion 5. As a result, the shaft portion 5 in the shaft insertion portion 16 cannot be visually recognized from the opening on the outer peripheral surface 6a side of the mounting portion 6, so that the user feels hygienic.

In the case of the leaf spring portion 50A, a pair of inclined surfaces 54a and 55a on the tip side of the spring pieces 54 and 55 are pushed by the shaft portion 5 inserted into the shaft insertion portion 16 and pushed toward the leaf spring portion 50A. The spring pieces 54 and 55 are pushed open from the outside. Therefore, even if the pair of spring pieces 54 and 55 are closed in the state before the replacement brush 43 is attached, it is easy to fit the shaft portion 5 into the leaf spring portion 50A.

Further, when removing the shaft portion 5 fitted in the leaf spring portion 50A, the shaft portion 5 to be pulled out pushes the base side inclined surfaces 54b, 55b of the spring pieces 54, 55, so that the pair of spring pieces 54, 55 is pushed open from the inside. Therefore, even if the pair of spring pieces 54 and 55 are closed with the replacement brush 43 attached, it is easy to remove the shaft portion 5 from the leaf spring portion 50A. In this way, by using the leaf spring portion 50A, it is possible to easily attach / detach the replacement brush 3 while making the shaft portion 5 invisible.
Further, in the leaf spring portion 50A, the tip side inclined surfaces 54a, 55a and the base side inclined surfaces 54b, 55b of the spring pieces 54, 55 act as guides when the shaft portion 5 is inserted or removed. Therefore, the shaft portion 5 can be easily fitted and removed from the leaf spring portion 50.

The distance d5 from the contact point between the spring piece 54 and the spring piece 55 to the opening of the shaft insertion portion 16 in the radial direction from the opening on the outer peripheral surface 6a side of the mounting portion 6 toward the central axis is the distance d5 of the pair of spring pieces 54, 55. The distance from the tip to the opening of the shaft insertion portion 16 is larger than the distance d6.
The distance d6 is preferably 1.0 mm or more, more preferably 1.5 mm or more and 3.0 mm or less. When the distance d6 is less than the lower limit of the above range, the shaft portion 5 cannot be removed from the spring pieces 54 and 55. When the distance d6 exceeds the upper limit of the above range, it becomes difficult to attach / detach the shaft portion 5.

The distance d5 is preferably 1.0 mm or more and 9.0 mm or less, and more preferably 3.0 mm or more and 7.0 mm or less in a range larger than the distance d6. When the distance d5 is equal to or greater than the lower limit of the above range, the tip side inclined surfaces 54a, 55a and the base side inclined surfaces 54b, 55b of the spring pieces 54, 55 act as guides. When the distance d5 is equal to or less than the upper limit of the above range, the shaft portion 5 can be easily fitted and removed from the leaf spring portion 50.

The leaf spring portion may be a leaf spring portion 50A in which only one of the pair of spring pieces 54 and 55 has a tip-side inclined surface. The leaf spring portion may have only the tip side inclined surface and may not have the base side inclined surface.
In addition, the present invention can be implemented in various forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention.

1,41 ... replaceable toothbrush, 2,42 ... brush body part, 3,43 ... replacement brush, 4 ... handle part, 5 ... shaft part, 6 ... mounting part, 6a ... outer peripheral surface, 6b ... rear end surface, 7 ... Head part, 8 ... Neck part, 9,9A ... Shielding part, 10 ... Hair planting hole, 12 ... Hair bundle, 14 ... Hair planting part, 16 ... Shaft insertion part, 18 ... Connecting part, 20 ... Connecting body, 22, 24 ... Recessed portion, 30 ... Leaf spring portion, 31 ... Base, 32, 33 ... Spring piece, 50 ... Leaf spring portion, 52 to 55 ... Spring piece, 54a, 55a ... Tip side inclined surface, 54b, 55b ... Base side inclined surface ..

Claims (8)

Brush body and
A replacement brush that is detachably attached to the tip of the brush body,
Is a replaceable toothbrush equipped with
The brush main body portion includes a handle portion and a shaft portion extending in the long axis direction from the tip of the handle portion.
The replacement brush includes a mounting portion to be mounted on the tip end side of the brush main body portion.
A groove-shaped shaft insertion portion that opens at the outer peripheral surface and the rear end surface of the mounting portion and extends in the long axis direction is formed in the mounting portion.
By inserting the shaft portion into the shaft insertion portion through the opening on the outer peripheral surface side of the mounting portion, the replacement brush is mounted on the brush main body portion.
A replaceable brush in which at least a part of the shaft portion in the shaft insertion portion is shielded by a shielding portion when the replacement brush is mounted on the brush main body portion and viewed from an opening on the outer peripheral surface side of the mounting portion. toothbrush. The shielding portion extends in the long axis direction from the tip of the handle portion, and is arranged on the outer peripheral surface side of the handle portion with respect to the shaft portion.
Both the shield portion and the shaft portion are inserted into the shaft insertion portion, and the shield portion and the shaft portion are inserted into the shaft insertion portion.
The replaceable toothbrush according to claim 1, wherein the shaft portion is shielded by the shielding portion when viewed from the opening on the outer peripheral surface side of the mounting portion. The shielding portion and the shaft portion are connected to form a connecting body.
The replaceable toothbrush according to claim 2, wherein the replacement brush is mounted on the brush main body portion by inserting the connecting body into the shaft insertion portion through an opening on the outer peripheral surface side of the mounting portion. A recess is formed between at least one of the shielding portions on the distal end side and the side surface side of the connecting body and the shaft portion.
Inside the mounting portion, a leaf spring portion into which the shaft portion inserted into the shaft insertion portion is fitted is provided.
The replaceable toothbrush according to claim 3, wherein the shaft portion of the portion of the connecting body inserted into the shaft insertion portion where the recessed portion is formed is fitted into the leaf spring portion. The replaceable toothbrush according to claim 4, wherein the recess is formed between the shielding portion on the tip end side of the connecting body and the shaft portion, and the tip portion of the shaft portion is fitted into the leaf spring portion. .. Inside the mounting portion, a leaf spring portion into which the shaft portion inserted into the shaft insertion portion is fitted is provided.
The leaf spring portion includes a pair of spring pieces that surround the shaft portion from both sides when viewed from the long axis direction.
The replaceable toothbrush according to claim 1, wherein the pair of spring pieces serves as the shielding portion and shields at least a part of the shaft portion when viewed from the opening on the outer peripheral surface side of the mounting portion. The pair of spring pieces have facing surfaces that are parallel to each other in the radial direction from the opening on the outer peripheral surface side of the mounting portion toward the central axis and face each other.
The replaceable toothbrush according to claim 6, wherein the length of the facing surface is larger than the length of the shaft portion in the radial direction. The replaceable toothbrush according to claim 6, wherein at least one of the pair of spring pieces has an inclined surface that approaches the other spring piece from the tip end to the proximal end when viewed from the long axis direction.

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