JP2017006396A - toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a toothbrush which can be easily used and has high removal performance of dirts on teeth.SOLUTION: A toothbrush comprises: a bar-shaped handle 11; and a rotary head 21 rotatably attached to the handle 11. The handle 11 comprises: a handle part 12 gripped by a hand; and a neck part 13 formed on a tip end part. The rotary head 21 comprises a transplantation surface 24 on which brush hairs 31 for brushing teeth are transplanted, and the rotary head is attached to a tip end part of the neck part 13 so as to rotate in parallel to a center axis line O of the handle part 12. The neck part 13 is curved so that the transplantation surface 24 is disposed on the center axis line O in a state in which the transplantation surface 24 is parallel to the center axis line O, in front view of the transplantation surface 24.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a toothbrush used when brushing teeth.

  Toothbrushes are generally used in which brush hairs are implanted at the end of a straight rod-like handle. Various types of toothbrushes have been proposed in which the tip shape and arrangement of brush bristles, the material, the shape of the tip of the handle, and the like are different in order to improve the brushing comfort and dirt removal performance.

  In a toothbrush with a straight handle, brush the teeth while moving the hand holding the handle according to the angle of the tooth, but when using the right hand, it is necessary to twist the wrist when brushing the right tooth. There is a problem that it becomes difficult. Similarly, when using the left hand, it is difficult to brush the left tooth. In addition, with a straight toothbrush, there is also a problem that it is difficult to apply the bristles to the teeth at an appropriate angle when polishing the back surface of the teeth.

  In order to solve these problems, a toothbrush in which a head member in which brush hairs are implanted is rotatably attached to the tip of a handle has been proposed (for example, see Patent Document 1).

Japanese Utility Model Publication No. 6-31528

  According to the toothbrush described in Patent Document 1, when brushing teeth, the head member rotates along with the teeth and the brush hair follows the teeth, so that the brush hair is always perpendicular to the teeth regardless of the position of the teeth. You can guess. This eliminates the need for twisting the wrist to an unreasonable angle and improves the ease of brushing teeth.

  However, in the toothbrush described in Patent Document 1, if a force is applied when brushing teeth, the head member rotates unexpectedly, and the force is not transmitted well to the teeth (brush hair), but it may be difficult to brush the teeth. is there.

  An object of the present invention is to provide a toothbrush that is easy to use and has high performance for removing dirt from teeth.

  The present invention comprises a rod-shaped handle and a rotary head rotatably attached to the handle, the handle having a handle portion gripped by a hand and a neck portion formed at a tip portion, The rotating head has a flocked surface in which brush hairs for brushing teeth are implanted, and is attached to the tip of the neck portion so as to rotate in parallel with the central axis of the handle portion. It is a toothbrush characterized by curving so that the flocked surface may be located on the central axis in a front view of the flocked surface in a state where the flocked surface is parallel to the central axis.

  According to the toothbrush of the present invention, it is provided with a rotating head having brush bristles rotatably attached to the handle, and the rotating head rotates along the teeth and the brush bristles follow the teeth. It is possible to brush the teeth without twisting to an unreasonable angle. At this time, since the flocked surface of the rotary head is arranged on the central axis of the handle portion in front view, the force of the toothbrush trying to rotate around the central axis of the handle portion is suppressed, and the force when brushing the teeth Is easy to be transmitted to the teeth (brush hair), is easy to use, and improves dirt removal performance.

  Moreover, the toothbrush of this invention WHEREIN: The said neck part is curving so that the flocked part which has the said flocked surface of the said rotation head may be located on the said center axis line.

  According to the toothbrush of the present invention, since the flocked portion of the rotary head is disposed on the central axis of the handle portion, the force with which the toothbrush tries to rotate around the central axis of the handle portion is further suppressed, and when brushing teeth The force is easily transmitted to the teeth (brush hair), and the dirt removal performance is further improved.

  Moreover, the toothbrush of this invention WHEREIN: The said neck part is curving so that it may not contact a tooth, when brushing the back surface of a tooth with the said bristle.

  According to the toothbrush of the present invention, since the neck portion is curved so as not to come into contact with the teeth when the back surface of the teeth is polished, the back surface of the teeth can be easily polished without twisting the wrist to an unreasonable angle.

  In the toothbrush of the present invention, the neck portion includes a cylindrical bearing portion to which the rotating head can be rotatably mounted, and the rotating head includes a shaft portion that is rotatably fitted to the bearing portion, In the shaft portion, the sliding portion that slides in the bearing portion touches a circle having a diameter larger than the inner diameter of the bearing portion at two or more points in a radial cross-sectional view, and an apex that contacts the circle is an arc shape. It is formed in a shape.

  According to the toothbrush of the present invention, the sliding portion is in contact with a circle having a diameter larger than the inner diameter of the bearing portion at two or more points in the radial cross-sectional view. Dynamic resistance is generated, the unexpected rotation of the rotary head is suppressed, the force when brushing the teeth is easily transmitted to the teeth (brush hairs), and the dirt removal performance is improved. In addition, since the sliding portion contacts the bearing portion at two or more points, the portion of the bearing portion that is not in contact with the sliding portion is deformed inward, and the force applied in the radial direction of the bearing portion is alleviated. Expansion is prevented. Thereby, even if it uses for a long period of time, the sliding resistance of a sliding part and a bearing part is maintained. Further, since the apex of the sliding portion is formed in an arc shape, damage to the bearing portion during sliding is prevented.

  In the toothbrush of the present invention, the sliding portion is formed in a triangular shape that is in contact with a circle having a diameter larger than the inner diameter of the bearing portion at three points in a radial sectional view.

  According to the toothbrush of the present invention, since the sliding portion contacts the bearing portion at three points, each vertex of the sliding portion can reliably contact the bearing portion, and the radial force applied to the bearing portion can be dispersed.

  In the toothbrush of the present invention, the rotary head is characterized in that the flocked surface is inclined with respect to a vertical surface in accordance with a tooth angle in a side view.

  According to the toothbrush of the present invention, since the flocked surface is inclined according to the angle of the tooth, the brush hair comes into contact with the tooth at an appropriate angle, and the dirt removal performance is improved.

  In the toothbrush of the present invention, the neck portion includes a cylindrical bearing portion to which the rotating head can be rotatably mounted, and the rotating head includes a shaft portion that is rotatably fitted to the bearing portion, The bearing portion has a convex portion whose inner diameter is reduced, and the shaft portion is formed such that the outer diameter of the tip portion is larger than the inner diameter of the convex portion, and the tip portion is a convex portion of the bearing portion. And is fitted to the bearing portion.

  According to the toothbrush of the present invention, the bearing portion has a convex portion whose inner diameter is reduced, the outer diameter of the tip portion of the shaft portion is formed larger than the inner diameter of the convex portion, and the tip portion of the shaft portion is Since the shaft portion is fitted to the bearing portion in a state of overcoming the convex portion of the bearing portion, it is possible to realize the prevention of detachment from the neck portion of the rotary head at a low cost.

  According to the toothbrush of the present invention, the rotating head rotates along the teeth and the brush bristles follow the teeth, so that it is possible to brush the teeth without twisting the wrist to an unreasonable angle. At this time, the force that the toothbrush tries to rotate around the central axis of the handle part is suppressed, so the force when brushing the teeth is easily transmitted to the teeth (brush hair), which is easy to use and improves the dirt removal performance. To do.

It is a front view of the toothbrush 1 of 1st Embodiment of this invention. It is a figure which shows the structure of the toothbrush 1 of FIG. It is a side view of the toothbrush 1 of FIG. It is a top view of the toothbrush 1 of FIG. It is radial direction sectional drawing in the sliding part 27 of the toothbrush 1 of FIG. It is a figure which shows the state which brushes teeth using the toothbrush 1 of FIG. It is a figure which shows the state which mounted the toothbrush 1 of FIG.

  FIG. 1 is a front view of a toothbrush 1 according to a first embodiment of the present invention. FIG. 2 is an enlarged view of a main part showing the configuration of the toothbrush 1 of FIG. FIG. 3 is a side view of the toothbrush 1 of FIG. FIG. 4 is a plan view of the toothbrush 1 of FIG. FIG. 5 is a radial cross-sectional view of the sliding portion 27 of the toothbrush 1 of FIG. FIG. 6 is a diagram showing a state in which teeth are brushed using the toothbrush 1 of FIG. FIG. 7 is a view showing a state where the toothbrush 1 of FIG. 1 is placed on the jig 51. In FIG. 2, the brush bristles 31 are omitted, the handle portion 12 is omitted in FIG. 3, and some reference numerals are omitted in FIG. 7.

  The toothbrush 1 according to the first embodiment is a toothbrush used when brushing teeth, and has a rod-shaped handle 11 and brush hairs 31 for brushing teeth, and a rotary head that is rotatably attached to the tip of the handle 11. The rotary head 21 is configured to be rotatable according to the position of the tooth to be polished.

  The handle 11 has a handle portion 12 to be gripped by hand and a neck portion 13 formed at the tip portion. A bearing portion 14 to which a rotary head 21 can be rotatably attached is attached to the tip portion of the neck portion 13. Is formed. The material of the handle 11 is not limited to a specific material, and the same material as that of a known toothbrush handle, for example, a synthetic resin such as an AS resin, an ABS resin, a polypropylene resin, a polyester resin, or an elastomer resin is used. Can do.

  The handle portion 12 is a portion that is gripped by hand when brushing teeth, and is formed in a square bar shape that is chamfered in a round shape. The shape of the handle portion 12 is not limited to a specific shape, and may be an appropriate shape as appropriate in consideration of easiness to hold, polishing comfort, and the like, as in a known toothbrush. Further, the handle portion 12 may be provided with a slip stopper or the like.

  A central axis O of the handle portion 12 is a central axis of a rotational moment around the longitudinal direction when the handle portion 12 is gripped and teeth are brushed.

  The neck portion 13 is formed at the distal end portion of the handle 11 and includes a bearing portion 14 to which the rotary head 21 can be rotatably attached at the distal end portion. The neck portion 13 is formed to be curved so as not to contact the teeth when the back surface of the teeth is polished.

  Further, the neck portion 13 is arranged such that the center of the flocked portion 22 of the rotary head 21 described later is arranged on the central axis O of the handle portion 12 so that the force when brushing the teeth is easily transmitted to the teeth (brush hairs 31). It is formed to be curved. When the center of the flocked portion 22 is disposed on the central axis O of the handle portion 12, the rotational moment around the central axis O of the handle portion 12 at the center of the flocked portion 22 becomes zero, and the flocked portion 22 (toothbrush 1) is moved to the handle portion 12. The force to rotate around the central axis O is suppressed, and the force for brushing the teeth is easily transmitted to the teeth (brush bristles 31).

  The rotational moment around the central axis O of the handle portion 12 will be described with reference to FIG. The jig 51 includes a base 52, a support block 53 that stands on the base 52 and supports the distal end of the handle portion 12 from below, and a base end of the handle portion 12 that stands on the base 52 from above. It comprises a support pin unit 54 for supporting and a weight 55. The support pin unit 54 is configured such that the height of the support pin 56 can be adjusted by a support pin 56 that supports the base end portion of the handle portion 12 and a fixing block 57 that is erected on the base 52 and fixes the support pin 56. Has been.

  With the flocking surface 24 of the rotary head 21 parallel to the central axis O of the handle portion 12, the distal end portion of the handle portion 12 is brought into contact with the distal end of the support block 53, and the proximal end portion of the handle portion 12 is placed on the support pin 56. The height of the support pin 56 is adjusted and fixed so that the toothbrush 1 is horizontal, abutting on the tip. This state simulates a state in which the toothbrush 1 is grasped by hand, and the central axis O of the handle portion 12 is horizontal.

  In this state, when the weight 55 is placed on the center of the flocked surface 24 of the rotary head 21 in order to simulate the force applied to the flocked portion 22 when brushing teeth, the toothbrush 1 (center axis O) remains horizontal. Quiesce. At this time, the rotational moment around the central axis O of the handle portion 12 at the center of the flocked portion 22 is zero, and the toothbrush 1 is stationary without rotating around the central axis O of the handle portion 12. Thus, in the toothbrush 1 of this embodiment, when the toothbrush is brushed, the force that the toothbrush 1 tries to rotate around the central axis O of the handle portion 12 is suppressed, and the force is firmly transmitted to the teeth (brush bristles 31). Can do.

  The neck portion 13 has at least the flocked surface 24 at the center of the handle portion 12 when the flocked surface 24 is viewed from the front in a state where the flocked surface 24 of the rotary head 21 described later is parallel to the central axis O of the handle portion 12. It only needs to be curved so as to be positioned on the axis O. In this case, when a force in a direction orthogonal to the central axis O is applied to a portion located on the central axis O in front view, the rotational moment around the central axis O of the handle portion 12 becomes 0, and the toothbrush 1 The force to rotate around the central axis O of the portion 12 is suppressed, and the force when brushing the teeth is easily transmitted to the teeth (brush bristles 31).

  However, if the center of the flocked portion 22, more preferably the center of the flocked portion 22 is arranged on the central axis O of the handle portion 12, the force with which the toothbrush 1 tries to rotate around the central axis O of the handle portion 12 is more It is suppressed and the force when brushing teeth is easily transmitted to the teeth (brush hairs 31).

  The bearing portion 14 is formed in a cylindrical shape at the distal end portion of the neck portion 13 so that a shaft portion 25 of the rotary head 21 described later can be inserted. On the inner peripheral surface of the bearing portion 14, a convex portion 15 having a reduced inner diameter is formed so as to lock the shaft portion 25 of the rotary head 21.

  The rotary head 21 includes a flocked portion 22 in which the brush bristles 31 are flocked and a shaft portion 25 that is inserted into the bearing portion 14 of the handle 11 and is rotatably attached. The flocked portion 22 and the shaft portion 25 are integrally formed. Is formed. The material of the rotary head 21 is not limited to a specific material, but the same material as the handle 11 is usually used.

  The flocked portion 22 is a rectangular base having both ends semicircular when viewed from the front, and has a large number of flocked holes 23 for flocking the brush hairs 31 on one side. In the flocked portion 22, a surface where the flocked hole 23 is formed is referred to as a flocked surface 24.

  The shape of the flocked portion 22 is not limited to a specific shape, and can be appropriately made into an optimal shape in consideration of the polishing comfort and the performance of removing dirt. Further, the number, shape, and arrangement of the flock holes 23 may be appropriately optimized in consideration of polishing comfort, dirt removal performance, and the like.

  The shaft part 25 protrudes from the center upper part of the flocked part 22 and is formed in a columnar shape. A concave portion 26 whose outer diameter is reduced is formed on the outer peripheral surface of the central portion of the shaft portion 25 so as to be engaged with the convex portion 15 of the bearing portion 14 of the handle 11. The shaft portion 25 has a tip inserted into the bearing portion 14 of the handle 11, passes through the convex portion 15 of the bearing portion 14, and engages the concave portion 26 with the convex portion 15 of the bearing portion 14. 14 is rotatably attached.

  The distal end portion of the shaft portion 25 is formed so that the outer diameter is slightly larger than the inner diameter of the convex portion 15 of the bearing portion 14. Therefore, when the tip portion of the shaft portion 25 passes through the convex portion 15 of the bearing portion 14, the convex portion 15 of the bearing portion 14 is expanded by elastic deformation so that the tip portion of the shaft portion 25 gets over the convex portion 15. pass. When the concave portion 26 of the shaft portion 25 and the convex portion of the bearing portion 14 are locked, the convex portion 15 of the bearing portion 14 returns to the inner diameter before the expansion, and the tip portion of the shaft portion 25 is protruded from the convex portion of the bearing portion 14. The part 15 cannot be removed. The difference between the outer diameter of the tip of the shaft portion 25 and the inner diameter of the convex portion 15 of the bearing portion 14 is preferably about 0.1 mm to 0.2 mm, but is not limited thereto.

  The shaft portion 25 is formed so as to be inclined with respect to the flocked surface 24. Accordingly, when the shaft portion 25 is attached to the bearing portion 14, the flocked surface 24 is inclined with respect to the vertical surface in the side view of the rotary head 21 (see FIG. 4). The inclination angle α between the shaft portion 25 and the flocked surface 24 is not limited to a specific angle, and is appropriately set to an optimal angle in consideration of the polishing comfort and dirt removal performance according to the tooth angle. Can do.

  When the rotary head 21 rotates, the shaft portion 25 slides in the bearing portion 14 on the outer peripheral surface below the recess 26. A portion of the shaft portion 25 that slides in the bearing portion 14 is referred to as a sliding portion 27. Note that the position of the sliding portion 27 is not limited to a lower portion than the concave portion 26, and may be an upper portion than the concave portion 26.

  The sliding portion 27 is formed in an arcuate shape with apexes and sides of an equilateral triangle having apexes in contact with a circle 40 having a diameter larger than the inner diameter of the bearing portion 14 in a radial sectional view (FIG. 5A). reference). The shape of the sliding portion 27 is not limited to this, but the outer diameter of the sliding portion 27 is added so that sliding resistance is added to such an extent that the rotary head 21 does not rotate easily when brushing teeth. Is preferably larger than the inner diameter of the bearing portion 14. If the rotating head 21 rotates unexpectedly while the teeth are being brushed, there is a risk that the dirt removal performance of the teeth will be reduced without transmission of force.

  Further, when the shape of the sliding portion 27 in the radial sectional view is a circle 40 having a diameter larger than the inner diameter of the bearing portion 14, a radial force is always applied to the bearing portion 14, and the bearing portion 14 is expanded due to secular change. The sliding resistance is lowered, and the rotating head 21 may rotate unexpectedly when brushing teeth. In order to prevent this, the sliding portion 27 is in contact with the circle 40 having a diameter larger than the inner diameter of the bearing portion 14 at two or more points in a radial sectional view, and has a shape having a smaller area than the circle 40. preferable.

  By making the sliding part 27 into the above-mentioned shape, an appropriate sliding resistance is applied at the part where the sliding part 27 and the bearing part 14 are in contact, and the sliding part 27 and the bearing part 14 are not in contact with each other. The bearing portion 14 is deformed inward at the portion and the force applied in the radial direction is relieved, and the sliding resistance is prevented from lowering due to aging (see FIG. 5B). At this time, the number of vertices in contact with the circle 40 having a diameter larger than the inner diameter of the bearing portion 14 may be two or more, but if it is two or three points, each vertex surely has an inner peripheral surface of the bearing portion 14. Is preferable. Furthermore, compared to the case of contact at two points, contact at three points is more preferable because the force applied to each vertex is dispersed.

  An example of the dimensional relationship between the sliding portion 27 and the bearing portion 14 shows the diameter of the circle 40 with which the apex of the sliding portion 27 contacts when the inner diameter of the bearing portion 14 is 3.9 mm and the thickness is 0.5 mm. Is 4.1 mm, and the distance of the gap from the midpoint of the arc-shaped side of the sliding portion 27 to the inner diameter of the bearing portion 14 is 0.2 mm. Further, the vertex of the sliding portion 27 is preferably arcuate to prevent damage to the bearing portion 14 during sliding, but the side connecting the vertex and the vertex of the sliding portion 27 may be a straight line. .

  The bristles 31 are not limited to specific ones, and brush bristles used for known toothbrushes can be appropriately selected and used. As a material of the brush hair 31, for example, chemically synthesized filaments such as nylon, polybutylene terephthalate, and polypropylene, and natural hairs such as pig hair and Badger hair can be used.

  Next, the operation of the toothbrush 1 of the present embodiment will be described. When brushing the back of teeth with the toothbrush 1, the rotary head 21 is rotated so that the flocked surface 24 faces the handle portion 12, the rotary head 21 is put in the mouth, and the brush bristles 31 are in contact with the back of the teeth. Move and brush your teeth.

  At this time, the center of the flocked portion 22 of the rotary head 21 is disposed on the central axis O of the handle portion 12, and the rotational moment around the central axis O of the handle portion 12 at the center of the flocked portion 22 becomes zero. The force that the portion 22 (toothbrush 1) tries to rotate around the central axis O of the handle portion 12 is suppressed, and the force when brushing the teeth is easily transmitted to the teeth (brush bristles 31). Further, since the sliding resistance 27 is moderately applied to the sliding portion 27 of the rotating head 21, the rotating head 21 does not rotate unexpectedly around the shaft portion 25, and the teeth can be brushed firmly.

  When changing the place where the teeth are brushed, the bristles 31 are pressed against the teeth with a force that exceeds the sliding resistance of the sliding portion 27 of the rotary head 21, so that the flocked surface 24 (brush bristles 31) follows the teeth. 21 rotates around the shaft portion 25. The toothbrush 1 may be taken out from the mouth and the rotary head 21 may be rotated by hand.

  When polishing the front surface of the tooth, the rotary head 21 is rotated 180 ° from the state of FIG. 6, the rotary head 21 is put into the mouth, and the brush bristles 31 are brought into contact with the front surface of the tooth to move the teeth. polish.

  According to the toothbrush 1 of the present embodiment, since the rotary head 21 that rotates along the arrangement of teeth is provided, the brushed surface 24 (brush hair 31) follows the teeth and the brush does not twist the wrist to an unreasonable angle. It becomes possible to brush the teeth with an appropriate angle of the bristles 31 and it is easy to use.

  Further, according to the toothbrush 1 of the present embodiment, since the neck portion 13 is formed so as not to come into contact with the teeth when the back surface of the teeth is polished, the back surface of the teeth can be applied without twisting the wrist to an unreasonable angle. Can be easily polished.

  Moreover, according to the toothbrush 1 of this embodiment, since the center of the hair transplantation part 22 of the rotary head 21 is arrange | positioned on the center axis line O of the handle part 12, the center axis line O around the handle part 12 in the center of the hair transplantation part 22 The rotation moment of the tooth becomes zero, the force that the flocked portion 22 (toothbrush 1) tries to rotate around the central axis O of the handle portion 12 is suppressed, and the force when brushing the teeth is easily transmitted to the teeth (brush bristles 31). It is very convenient to use and improves the dirt removal performance.

  Further, according to the toothbrush 1 of the present embodiment, the sliding portion 27 has an arcuate shape with apexes and sides of an equilateral triangle in contact with the circle 40 having a diameter larger than the inner diameter of the bearing portion 14 in the radial cross-sectional view. Therefore, an appropriate sliding resistance is generated between the sliding portion 27 and the bearing portion 14, the unexpected rotation of the rotary head 21 is suppressed, and the force when brushing the teeth is increased by the teeth (brush bristles 31). ) And dirt removal performance is improved.

  Further, since the sliding portion 27 contacts the bearing portion 14 at three points, the portion of the bearing portion 14 that is not in contact with the sliding portion 27 is deformed inward and the force applied in the radial direction of the bearing portion 14 is alleviated, and the secular change occurs. The expansion of the bearing portion 14 due to is prevented. Thereby, even if it uses for a long period of time, the sliding resistance of the sliding part 27 and the bearing part 14 is maintained. Further, since the apex of the sliding portion 27 is formed in an arc shape, damage to the bearing portion 14 during sliding is prevented.

  Moreover, according to the toothbrush 1 of this embodiment, since the flocked surface 24 inclines according to the angle of a tooth, the brush hair 31 contact | abuts to a tooth at an appropriate angle, and the removal performance of dirt improves more. In addition, it may replace with the flocking surface 24 and may arrange so that the front-end | tip of the bristle 31 may incline.

  Further, according to the toothbrush 1 of the present embodiment, the bearing portion 14 has the convex portion 15 whose inner diameter is reduced, and the outer diameter of the tip portion of the shaft portion 25 is formed larger than the inner diameter of the convex portion 15. The shaft portion 25 is rotatably fitted to the bearing portion 14 with the tip end portion of the shaft portion 25 getting over the convex portion 15 of the bearing portion 14, and the rotary head 21 is easy to process and assemble. Can be reliably prevented from falling off the neck portion 13.

  As mentioned above, although the toothbrush of this invention was demonstrated using the toothbrush 1 of 1st Embodiment, the toothbrush of this invention is not limited to the said embodiment, It deform | transforms and uses in the range which does not change a summary. be able to. For example, when the flocked surface 24 is viewed from the front in a state where at least the flocked surface 24 of the rotary head 21 is parallel to the central axis O of the handle portion 12, the flocked surface 24 is at the center axis of the handle portion 12. It only needs to be curved so as to be positioned on O, and may also be curved in a side view (FIG. 3).

  Moreover, the toothbrush of this invention can be used suitably not only when brushing one's own tooth but also when brushing another person's tooth.

  As described above, the preferred embodiments have been described with reference to the drawings. However, those skilled in the art will readily understand various changes and modifications within the obvious scope by looking at the present specification. Therefore, such changes and modifications are interpreted as being within the scope of the invention defined by the claims.

DESCRIPTION OF SYMBOLS 1 Toothbrush 11 Handle 12 Handle part 13 Neck part 14 Bearing part 21 Rotating head 22 Flocked part 24 Flocked surface 25 Shaft part 27 Sliding part 31 Brush bristles 40 yen

Claims (7)

A rod-shaped handle and a rotating head rotatably attached to the handle;
The handle has a handle portion to be gripped by a hand and a neck portion formed at a tip portion,
The rotating head has a flocked surface in which brush bristles for brushing teeth are implanted, and is attached to the tip of the neck portion so as to rotate in parallel with the central axis of the handle portion.
The toothbrush characterized by the said neck part being curved so that the said flocked surface may be located on the said central axis in the front view of the said flocked surface in the state in which the said flocked surface is parallel to the said central axis.   The toothbrush according to claim 1, wherein the neck portion is curved so that a flocked portion having the flocked surface of the rotary head is positioned on the central axis.   The toothbrush according to claim 1 or 2, wherein the neck portion is curved so as not to contact a tooth when the back surface of the tooth is brushed with the brush bristles. The neck portion includes a cylindrical bearing portion to which the rotating head can be rotatably attached,
The rotary head includes a shaft portion that is rotatably fitted to the bearing portion,
In the shaft portion, the sliding portion that slides in the bearing portion touches a circle having a diameter larger than the inner diameter of the bearing portion at two or more points in a radial cross-sectional view, and an apex that contacts the circle is an arc shape. The toothbrush according to any one of claims 1 to 3, wherein the toothbrush is formed in a shape.   The toothbrush according to claim 4, wherein the sliding portion is formed in a triangular shape in contact with a circle having a diameter larger than the inner diameter of the bearing portion at three points in a radial sectional view.   The toothbrush according to any one of claims 1 to 5, wherein in the side view, the flocked surface is inclined with respect to a vertical surface according to a tooth angle. The neck portion includes a cylindrical bearing portion to which the rotating head can be rotatably attached,
The rotary head includes a shaft portion that is rotatably fitted to the bearing portion,
The bearing portion has a convex portion whose inner diameter is reduced,
The shaft portion is formed such that the outer diameter of the tip portion is larger than the inner diameter of the convex portion, and the tip portion gets over the convex portion of the bearing portion and is fitted to the bearing portion. The toothbrush according to any one of claims 1 to 6.