JP2018191827A - Toothbrush for infant - Google Patents

Abstract

To provide an infant toothbrush that can easily reduce a child's throat accident caused by a fall by buffering an impact force.
An infant toothbrush (1) having a head part (2) for an infant on the mouth (3) on the distal end (3) side in the longitudinal direction and a columnar handle part (4) on the proximal end (5) side. A buffer portion 6 is provided in the middle of the handle portion 4, and the buffer portion 6 is bent so that the head portion 2 is displaced in a direction orthogonal to the flocked surface on which the brush 7 is flocked, and the base end 5 side The impact force acting toward the head portion 2 is buffered.
[Selection] Figure 1

Description

  The present invention relates to a toothbrush, and more particularly to a toothbrush that cushions an impact force.

  2. Description of the Related Art Conventionally, there is a toothbrush having a head portion in which a brush for cleaning a user's teeth is implanted and a columnar handle portion gripped by the user's fingers.

  Some conventional toothbrushes are attached to the handle portion so that the head portion can rotate around a rotation axis orthogonal to the central axis of the handle portion (Patent Document 1).

  In such a conventional toothbrush, the brush is implanted on the distal end side of the head portion, and the head portion has a pressing operation portion on the opposite side of the distal end side across the rotation shaft. The user can rotate the front end side of the head portion to the front side of the flocked surface of the brush by pressing the pressing operation portion with the thumb while holding the handle portion with fingers other than the thumb.

  Therefore, in the conventional toothbrush, the user can adjust the angle at which the head portion is bent with respect to the handle portion with the rotation axis as the center, by adjusting the degree of pressing. As a result, the user can rub the necessary part of the tooth with the brush, and the effect of brushing can be enhanced.

JP, 2006-64031, A

  In the conventional toothbrush described in Patent Document 1, the head portion has the pressing operation portion on the proximal end side of the rotation shaft, and bends around the rotation shaft. Therefore, the tip of the head part is long from the rotating shaft, and the rotating shaft is located outside the user's oral cavity when brushing teeth.

  By the way, when the user is an infant around 3 years old, it is known that the user tends to walk around with the head portion of the toothbrush in his mouth. When such a user trips over an obstacle or the like, the handle portion of the toothbrush easily hits the floor or the ground. Therefore, a toothbrush for an infant around 3 years old must have a structure that prevents the head portion from damaging the user's throat even when it falls.

  When the infant uses the conventional toothbrush, the rotation shaft is located outside the infant's oral cavity. Therefore, in this toothbrush, the infant falls while holding the head portion in the mouth, and the handle portion pushes the head portion while the head portion remains undeformed in the infant's oral cavity.

  Therefore, in the conventional toothbrush, there is a high possibility that the tip pushed by the handle portion when the infant falls down directly hits the infant's throat. As described above, with a conventional toothbrush, it is not easy to reduce an infant's throat accident caused by a fall.

  In view of such a problem, an object of the present invention is to provide a toothbrush capable of easily reducing an infant's throat accident caused by a fall.

  The present invention is an infant toothbrush having a head portion that is attached to the mouth of an infant on the distal end side in the longitudinal direction and a columnar handle portion on the proximal end side, and is buffered between the head portion and the handle portion. The buffer portion is bent so that the head portion is displaced in a direction perpendicular to the flocked surface on which the brush is implanted, and shock force acting from the base end toward the head portion is buffered. An infant toothbrush is provided.

  That is, in the infant toothbrush of the present invention, when the infant holding the head portion falls and receives an impact force from the base end side, the middle between the head portion and the handle portion is bent. Therefore, the infant toothbrush is bent in the oral cavity, so that the impact force is buffered in the oral cavity and is not directly transmitted to the infant's throat.

  Since the impact force is not directly transmitted in this way, there is little possibility that the infant will injure the throat by the tip of the infant toothbrush due to the fall.

  On the other hand, since the buffer part bends in a direction orthogonal to the flocked surface on which the brush is implanted, the force when an infant normally brushes teeth is not dispersed in the surface direction of the flocked surface.

  Moreover, you may have a restraining means which restrains the said head part so that it may not bend | curve to the back side of the said flocked surface with respect to the said handle part.

  Infant toothbrushes may be finished so that after an infant brushes his / her own teeth, an adult brushes the unsatisfactory portion of the infant. In addition, adults may brush their teeth from the beginning.

  Therefore, even when the infant or the adult (hereinafter, the infant and the adult using the infant toothbrush are collectively referred to as a “user”) rubs the teeth strongly with the brush, the buffer portion does not have the teeth at this time. It does not bend in the reverse direction due to the rubbing force. Therefore, the user can continue brushing his teeth as it is even when he / she rubs his / her teeth with his / her fingers. Thus, depending on the infant toothbrush, there is little risk of damaging the throat without interrupting toothpaste.

  Furthermore, when the said head part displaces, you may have a biasing means which urges | biases so that the said head part may be restored to an original position.

  That is, when the infant bumps the tip against a site in the oral cavity, the infant toothbrush can restore the head portion to its original position after the buffer portion is bent once. Therefore, the infant can continue brushing the teeth without returning the position of the head part with fingers or the like when the tip is hit against a part in the oral cavity even if the infant does not fall down. Thus, depending on the infant toothbrush, there is little risk of damaging the throat without interrupting toothpaste.

  The present invention is an infant toothbrush having a head portion that is attached to the mouth of an infant on the distal end side in the longitudinal direction and a columnar handle portion on the proximal end side, and is buffered between the head portion and the handle portion. The buffer portion has a rotation center line orthogonal to the center axis of the handle portion, and the head portion is rotatable around the rotation center line with respect to the handle portion. An infant toothbrush is provided.

  That is, in the infant toothbrush of the present invention, since the handle portion rotates around the rotation center line in the buffer portion, even when the handle portion receives an impact force due to the fall of the infant, the tip is not attached to the infant. It is possible to avoid piercing the throat.

  Moreover, the said buffer part may be arrange | positioned in the position within 50 mm from the said front-end | tip.

  In Japan, it is known that infants around the age of 3 cause many throat accidents caused by toothbrushes, and the length from the maxillary incisor to the deepest part in the oral cavity of a 3-year-old child is about 52 mm. Therefore, the buffer portion is arranged at a position within 50 mm from the tip, so that the buffer portion is bent in the infant's oral cavity when the tip reaches the back of the infant's throat at the time of falling.

  That is, in the toothbrush for infants, since the buffer portion is bent in the oral cavity of the infant to be used, the entire head part that is bent is positioned in the oral cavity of the infant. Therefore, even when the handle portion is pushed from the outside of the oral cavity, the infant toothbrush is bent in the oral cavity, so that the impact force transmitted from outside the oral cavity is buffered in the oral cavity and is not directly transmitted to the infant's throat. .

  Further, a first contact member that rotates integrally with the head portion is provided, and a second contact member that is fixed on a rotation circle of the first contact member is provided on the handle portion side. The second abutting member may abut against the first abutting member, and the rotation of the handle portion in the reverse direction of the flocked surface on which the brush is implanted may be restrained.

  That is, even when the user rubs the teeth strongly with the bristles, the head portion is prevented from rotating in the reverse direction by the abutment of the abutment members, and rotates by the force of rubbing the teeth at this time. There is nothing. Therefore, the user can continue brushing the teeth without rotating the head part even when the user puts force on the fingers and rubs the teeth.

  Furthermore, an elastic body that integrally covers the buffer portion side end of the head portion and the buffer portion side end of the handle portion is provided, and the elastic body has the buffer portion side ends in the radial direction of the central axis. The head portion and the handle portion are fixed to each other by being tightened inwardly, and the head portion is deformed by rotation of the head portion. In the deformed state, the head portion is elastically biased to the back of the flocked surface. Also good.

  That is, even when the infant does not fall down, the infant toothbrush can restore the head part to its original posture after the buffer part is bent once. Therefore, the infant can continue brushing the teeth without returning the position of the head part with fingers or the like even after the tip is hit against a site in the oral cavity.

  The elastic body may be integrally molded with the head portion, the handle portion, or the head portion and the handle portion.

  That is, since the step of fixing the elastic body to each of the head portion and the handle portion can be omitted after the molding, the manufacturing process can be shortened.

  The buffer portion may have one of the head portion and the handle portion having a support shaft on the rotation center line, and the head portion may be pivotally attached to the handle portion via the support shaft. .

  That is, since the head portion is pivotally attached to the handle portion, the infant toothbrush can be obtained by assembling the head portion and the handle portion separately. Therefore, the material and color of the head part and the handle part can be different.

  On the other hand, the buffer part has a hinge part that can be bent around the rotation center line, the head part and the handle part are formed integrally with the hinge part, and the head part is elastic of the hinge part. You may rotate with a deformation | transformation.

  That is, since the head part, the handle part, and the hinge part are integrally formed, they can be manufactured at a time. As a result, the manufacturing process can be shortened.

  Thus, in the infant toothbrush of the present invention, it is possible to easily reduce an infant's throat accident caused by a fall.

(A) It is a front view of the toothbrush for infants which shows the 1st Embodiment of this invention. (B) It is a front view which shows the state which the buffer part of the infant toothbrush bent similarly. (A) It is a top view of the toothbrush for infants which shows the 1st Embodiment of this invention. (B) It is a bottom view of a toothbrush for infants similarly. (A) It is the front view to which the buffer part vicinity of the infant toothbrush which shows the 1st Embodiment of this invention was expanded. (B) It is the front view which expanded the buffer part vicinity in the state which the buffer part of the infant toothbrush bent similarly. It is the bottom view to which the buffer part vicinity of the infant toothbrush which shows the 1st Embodiment of this invention was expanded. (A) It is explanatory drawing of the toothbrush for infants which shows the 1st Embodiment of this invention. (B) It is explanatory drawing which shows the state of the oral cavity of an infant. (A) It is a front view of the toothbrush for infants which shows the 2nd Embodiment of this invention. (B) It is front sectional drawing of the head part and buffer part of an infant toothbrush similarly. It is front sectional drawing of the head part and buffer part in the state where the buffer part of the infant toothbrush which shows the 2nd Embodiment of this invention was bent. (A) It is front sectional drawing of the toothbrush for infants which shows the 3rd Embodiment of this invention. (B) It is front sectional drawing which shows the state which the buffer part of the infant toothbrush bent similarly. (A) It is a top view of the toothbrush for infants which shows the 3rd Embodiment of this invention. (B) It is a bottom view of a toothbrush for infants similarly. (A) It is front sectional drawing to which the buffer part vicinity of the infant toothbrush which shows the 3rd Embodiment of this invention was expanded. (B) It is front sectional drawing which expanded the buffer part vicinity in the state which the buffer part of the infant toothbrush bent similarly.

  1 to 5 illustrate a first embodiment of the present invention. In the figure, reference numeral 1 denotes an infant toothbrush, and an arrow with a symbol L represents a longitudinal direction of the infant toothbrush 1.

  As shown in FIGS. 1A, 1B, and 2A, 2B, the infant toothbrush 1 has a head portion 2 on the distal end 3 side in the longitudinal direction L that an unillustrated infant C holds in the mouth. And the column-shaped handle part 4 is provided in the base end 5 side. Further, the infant toothbrush 1 is provided with a buffer portion 6 between the head portion 2 and the handle portion 4. The central axis in the longitudinal direction L of the head portion 2 and the central axis in the longitudinal direction L of the handle portion 4 are substantially coincident with the central axis Ca in the longitudinal direction L of the infant toothbrush 1.

  In the infant toothbrush 1, the infant C grips the handle portion 4 with fingers to brush the teeth, and the head portion 2 is inserted into the oral cavity M of the infant C. In addition, after the infant C brushes his / her own teeth, the adult A (not shown) may perform “finish brushing” by using the infant toothbrush 1 to polish an insufficient portion of the infant C. During such finishing polishing, the adult A grips the handle portion 4 with fingers and inserts the head portion 2 into the oral cavity M of the infant C. Alternatively, the same applies when the adult A brushes the infant C's teeth using the infant toothbrush 1 from the beginning.

  The head portion 2 is a molded product of engineering plastics such as general-purpose resin such as polypropylene and polystyrene or saturated polyester resin, and extends in the longitudinal direction L from the buffer portion 6 to the tip 3. On the tip 3 side, bundled filament-like brushes 7 are planted on the planted surface 2a. Users A and C who are infants C or adults A (hereinafter, infants C and adults A who use the infant toothbrush 1 are collectively referred to simply as “users A and C”) operate the handle portion 4. Then, the brush 7 is pressed against the tooth T of the infant C through the head portion 2 to brush the teeth.

  The front direction of the flocked surface 2a in the direction orthogonal to the flocked surface 2a is represented by an arrow with a symbol F in the figure, and the reverse direction is represented by an arrow with a symbol B in the figure.

  The head portion 2 has a height H1 in a front view shown in FIG. 3A and a width W1 in a bottom view shown in FIG. 4 at a portion closer to the base end 5 in the longitudinal direction L than the flocked surface 2a. The head portion 2 has a rotating plate portion 2b that protrudes toward the base end 5 in the longitudinal direction L and has a height H2 lower than H1 and a width W2 narrower than W1. In the bottom view of FIG. 4, the center line in the width direction of the rotating plate portion 2b coincides with the center axis Ca. Moreover, the rotating plate part 2b has the stop surface 2d which faces backward B as shown to Fig.3 (a) (b).

  Furthermore, the head part 2 has a pair of rotating shaft parts 2c and 2c which protrude from the rotating plate part 2b in the vertical direction of FIG. Each of the rotation shaft portions 2c and 2c forms a columnar shape having a rotation axis Cb orthogonal to the center axis Ca as a center line.

  The handle portion 4 is a molded product of engineering plastics such as general-purpose resin such as polypropylene and polystyrene or saturated polyester resin, and extends in the longitudinal direction L from the buffer portion 6 to the base end 5. As shown in FIGS. 1A and 1B and FIGS. 2A and 2B, a bulging portion 4a bulging in a direction away from the central axis Ca is provided near the buffer portion 6 in the longitudinal direction L. When the users A and C hold the handle portion 4 with their fingers, they can hook a part of their fingers on the bulging portion 4a.

  Further, the handle portion 4 is formed so as to extend toward the tip 3 in the longitudinal direction L so as to be located on the reverse side B side of the rotating plate portion 2b in the state of FIG. 3A before the head portion 2 rotates. It has a stopper portion 4b. Furthermore, it has the U-shaped bracket part 4c opened toward the front-end | tip 3 of the longitudinal direction L in the bottom view of FIG. The bracket part 4c is formed so as to protrude downward from the stopper part 4b in FIGS. The stopper portion 4b has a stop surface 4d facing downward in FIGS. 3 (a) and 3 (b).

  The bracket part 4c has a pair of support plates opposed to each other in the vertical direction in FIG. Each of the pair of support plates has a vertical through-hole 4e in FIG. Each through-hole 4e has a circular cross section. Moreover, the bracket part 4c has the height H3 of the front view which FIG. 3 shows, and the width W3 of the bottom view which FIG. 4 shows. In the bottom view, the center line in the width direction of the bracket portion 4c coincides with the center axis Ca.

  The height H3 of the bracket portion 4c shown in FIG. 3A is slightly larger than the height H2 of the rotating plate portion 2b. Further, the pair of support plates of the bracket portion 4c are arranged with an interval of a width W4 shown in FIG. At this time, the width W4 of the gap is slightly larger than the width W2 indicating the thickness of the rotating plate portion 2b.

  The rotating plate portion 2b is mounted on the bracket portion 4c so that the rotating shaft portions 2c and 2c are loosely fitted in the through holes 4e and 4e. At this time, the rotating plate portion 2b and the stopper portion 4b are arranged such that the respective restraining surfaces 2d and 4d are in contact with each other. Moreover, the center axis line of each through-hole 4e, 4e corresponds with the rotating shaft line Cb of each rotating shaft part 2c, 2c.

  Since the cross section of each through-hole 4e, 4e and the cross section of each rotary shaft part 2c, 2c are both circular, the head part 2 can rotate around the rotation axis Cb with respect to the handle part 4. FIG. 3B shows a state after the head unit 2 has rotated around the rotation axis Cb in the front direction F from the state of FIG.

  However, even when a force is applied to rotate the head portion 2 backward B from the state of FIG. 3A or FIG. 3B, the stopper portion 4b of the handle portion 4 is provided on each of the restraining surfaces 2d and 4d. Is in contact with the rotating plate portion 2b of the head portion 2, so that the head portion 2 is prevented from rotating backward B as compared with the state of FIG. As a result, the head unit 2 can rotate only in the front direction F as shown in FIG.

  For example, in the infant toothbrush 1, after the head portion 2 starts to rotate backward around the rotation axis Cb from the state of FIG. 3A, the head portion 2 and the handle portion 4 on the rotation surface of the head portion 2 are rotated. When the crossing angle θ1 becomes 0, the state shown in FIG.

  At this time, as the head portion 2 rotates, the stop surface 2d of the rotating plate portion 2b gradually approaches the stop surface 4d of the stopper portion 4b while drawing a locus along the rotation circle T in FIGS. 3 (a) and 3 (b). Thus, it comes into contact with the stop surface 4d of the stopper portion 4b. As a result, the head portion 2 cannot rotate backward B as compared with the state of FIG.

  In the present embodiment, the first contact portion is another name for the rotating plate portion 2b having the restraining surface 2d. The second contact portion is another name for the stopper portion 4b having the stop surface 4d.

  Further, in the present embodiment, the buffer portion 6 is a combination of the rotary plate portion 2b and the bracket portion 4c in a state where the rotary shaft portions 2c and 2c are loosely fitted in the through holes 4e and 4e as described above. It is a name used for naming.

  The brushes 7 are planted so that each of the hair ends faces F.

  As described above, the buffer portion 6 in which the rotation shaft portion 2c and the bracket portion 4c are combined has the rotation axis Cb as the center so that the head portion 2 is displaced in the front direction F as shown in FIG. Bends.

  Further, the rotating plate portion 2b rotates around the rotation axis Cb, and the stopper portion 4b is placed on the rotating circle T of the restraining surface 2d of the rotating plate portion 2b (first contact member) shown in FIGS. Since the stop surface 4d of the (second contact member) is located and the stop surfaces 2d and 4d face each other and come into contact with each other, the stopper portion 4b stops the rotating plate portion 2b in the front direction F. Thus, in the infant toothbrush 1, the head portion 2 is restrained from being bent backward B.

  The buffer portion 6 is not limited to the structure in which the through hole 4e passes through the bracket portion 4c as described above, and the rotary plate portion 2b is pivotally supported so that the bracket portion 4c can rotate around the rotation axis Cb. For example, the tip of the rotating shaft 2c may be engaged with a recess that does not penetrate.

  Further, the head portion 2 is not limited to the structure having the rotating plate portion 2b and the handle portion 4 has the bracket portion 4c, so that the head portion 2 can rotate around the rotation axis Cb with respect to the handle portion 4. For example, the head part 2 may have a bracket part, and the handle part 4 may have a rotating plate part. At this time, the buffer portion 6 is a generic term for the bracket portion on the head portion 2 side and the rotating plate portion on the handle 4 side.

  Further, the handle portion 4 is not limited to the structure having the stopper portion 4b facing the tip 3, and the first abutting member on the head portion 2 side and the second abutting member on the handle portion 4 side include the first contact member. It is only necessary to stop the rotation of the handle part 2 in the reverse direction B by abutting on the rotation circle of the contact member. For example, a convex part (first abutting member) projecting toward the base end 5 from the head part 2 side. However, the structure which can contact | abut to the recessed part (2nd contact member) by the side of the handle | steering-wheel 4 may be sufficient.

  FIG. 5A shows that the total length in the longitudinal direction L of the infant toothbrush 1 is represented as L1, and the head length from the distal end 3 to the proximal end 5 side end of the buffer portion 6 is represented as L2. Further, the buffer unit 6 is bent around the rotation axis Cb, and the head unit 2 is displaced in the front direction F.

  Fig. 5 (b) is from "Survey Report on Infant Accidents Infant Oral Volume Survey Report" (hereinafter simply referred to as "Survey Report") published by the Japan Family Planning Association in March 2002. It is the quoted figure and shows the position of the maxillary incisor part Ma in the oral cavity M of the infant C and the position of the deepest part Mb. The research report shows the depth D of the oral cavity M by the distance between the maxillary incisor part Ma and the deepest part Mb, and this depth D shows that the average of 3 year old children is 52.1 mm as a result of simulation. Yes.

  By the way, the infant toothbrush 1 has a head length L2 set to be shorter than 50 mm. Therefore, an infant C having a mouth D with a depth D of 52.1 mm falls while holding the head part 2 of the infant toothbrush 1 in the mouth M, and the handle part 4 is pushed from the floor or the ground, whereby the tip 3 is inflicted. When reaching the back of the throat of C, the buffer 6 is located in the oral cavity M, and the shock from the floor or the ground is buffered by bending the oral cavity M so that the head 2 rotates about the rotation axis Cb. To do.

  Thereby, the impact force transmitted from the handle part 4 that is partly located outside the oral cavity M is buffered in the oral cavity M and is not directly transmitted to the throat of the infant C. Therefore, depending on the infant toothbrush 1, the possibility that the tip 3 may damage the throat of the infant C is small.

  Further, the head length L2 may be set to 27 mm or more and less than 37 mm. In the infant toothbrush 1, since the overall length L1 is generally around 125 mm, the head length L2 is in the range of 27 mm to 37 mm, so that the ratio of the length in the longitudinal direction L between the head portion 2 and the handle portion 4 is: The infant C can be contained in a ratio where it is easy to brush teeth. As a result, the infant toothbrush 1 makes it easier for the infant C to grip the handle portion 4 with fingers and to reduce accidents due to unnatural holding.

  Furthermore, the head unit 2 can rotate only in the front direction F. Therefore, depending on the infant toothbrush 1, even when the users A and C rub their teeth with their fingers applied, the head portion 2 does not rotate backward B, and the brushing can be continued without interruption. it can.

  That is, the brush 7 is implanted on the flocked surface 2a so that the tip of the brush faces the front direction F. Therefore, the brush 7 generates a reaction force B facing down when it hits the tooth. Therefore, even when the head part 2 receives this reaction force in the reverse direction B via the brush 7, the head part 2 does not rotate in the reverse direction B. You can continue to apply power from 4.

  6 (a), 6 (b), and 7 illustrate a second embodiment of the present invention, and reference numeral 11 denotes an infant toothbrush. The infant toothbrush 11 has urging means for urging the head portion 12 to return to the original position after the buffer portion 16 is bent and the head portion 12 is displaced in the front direction F.

  The head portion 12 is reduced in diameter toward the end of the buffer portion 16 as it approaches the tip 13 in the longitudinal direction L as shown in FIG. 6B, and the center axis substantially coincides with the center axis Ca of the infant toothbrush 11. It has a truncated cone-shaped fastening part 12e. Moreover, the handle | steering-wheel part 14 has the cylindrical fastening part 14f in which the center axis line is substantially corresponded with the center axis line Ca of the infant toothbrush 11 in the buffer part 16 side end.

  Each of the tightening portions 12e and 14f is covered with a cylindrical elastic body 18 whose center axis substantially coincides with the center axis Ca of the infant toothbrush 11. The elastic body portion 18 is a molded product of rubber, and can be elastically deformed in any direction including the circumferential direction W and the longitudinal direction L. Other configurations are common to the first embodiment.

  The elastic body portion 18 has an inner wall 18a on the distal end 13 side and an inner wall 18b on the proximal end 15 side, respectively, than the peripheral surface of the tightening portion 12e in the head portion 12 and the peripheral surface of the tightening portion 14f in the handle portion 14. It is formed to have a small diameter. In addition, the tightening portions 12e and 14f are fitted inside the elastic body portion 18 while expanding the corresponding inner walls 18a and 18b from the central axis Ca side to the radially outward direction. As a result, the elastic body portion 18 is elastically deformed in the circumferential direction W, and the respective peripheral surfaces corresponding to the inner walls 18a and 18b are tightened inward in the radial direction, and fixed to the head portion 12 and the handle portion 14.

  At this time, the rotating plate portion 2b is attached to the bracket portion 14c inside the elastic body portion 18.

  FIG. 7 shows a state in which the buffer portion 16 is bent and the head portion 12 rotates around the rotation axis Cb in the front direction F and is displaced downward in the drawing. By this rotation, the back-side peripheral wall 18c, which is a peripheral wall located in the reverse direction B of the elastic body portion 18, is pulled in the longitudinal direction L by the tightening portions 12e and 14f and elastically deformed.

  Therefore, after the buffer portion 16 is bent, the elastic body portion 18 tries to restore the original shape, and the back-side peripheral wall 18c is pulled in a direction in which the respective back-facing B-side portions of the tightening portions 12e and 14f are brought closer to each other. The handle portion 12 is biased backward B.

  Thus, even when the infant C does not fall down, when the tip 13 of the infant toothbrush 11 is hit against a part in the oral cavity M such as a tooth or an upper jaw during brushing, the buffer 16 is once bent and returned to its original posture. It can be restored. Therefore, even when the users A and C hit the tip 13, they can continue brushing their teeth without returning the position of the head 12 with their fingers.

  The tightening portion 12e of the head portion 12 is not limited to the truncated cone shape, and may be any shape as long as the inner wall 18a on the distal end 13 side of the elastic body portion 18 is in close contact, for example, a truncated pyramid shape or a column shape. Further, the tightening portion 14f of the handle portion 14 is not limited to a cylindrical shape, and may be any shape as long as the inner wall 18b on the proximal end 15 side of the elastic body 18 is in close contact, and may be, for example, a prismatic shape or a truncated cone shape.

  Furthermore, the elastic body portion 18 is not limited to a cylindrical shape, and may be any shape as long as the inner walls 18a and 18b are in close contact with the peripheral surfaces of the tightening portions 12e and 14f. The material of the elastic body portion 18 is not limited to rubber, and may be any material that can be elastically deformed in both the circumferential direction W and the longitudinal direction L. For example, synthetic resin may be used.

  A modification of the second embodiment will be described with reference to FIGS.

  In the modified example, the elastic body portion 18 is formed separately from the head portion 12 and the handle portion 14 in advance, and the tightening portions 12e and 14f are not fitted therein, but the head portion 12 and the handle portion. 14 and two-color molding. That is, the head portion 12 and the handle portion 14 in a state where the rotating plate portion 2b is mounted on the bracket portion 14c are inserted into a mold for injection molding, and synthetic resin or the like is provided around the head portion 12 and the handle portion 14. The elastic material is injected, and the head portion 12 and the handle portion 14 are integrally molded. Other configurations are common to the example of the second embodiment described above.

  The shape of the elastic body portion 18 in the modified example is the same as that formed separately from the head portion 12 and the handle portion 14. That is, the elastic body portion 18 has a cylindrical shape, and the inner walls 18a and 18b are in close contact with the peripheral surfaces of the tightening portions 12e and 14f.

  Further, the elastic body portion 18 in the modified example can be elastically deformed in any direction including the circumferential direction W and the longitudinal direction L. And since it is formed by being pulled in the circumferential direction W by two-color molding, the inner walls 18a, 18b are fastened to the respective circumferential surfaces inward in the radial direction by contraction force, and are fixed to the head portion 12 and the handle portion 14. The

  By this two-color molding, the head portion 12 is not attached to the handle portion 14 inside the elastic body portion 18 as described above, but can be covered with the elastic body portion 18 after being attached in advance. In addition, the head portion 12 and the handle portion 14 and the elastic body portion 18 can be fixed simultaneously with the molding of the elastic body portion 18. These make it possible to shorten the manufacturing process.

  The back side peripheral wall 18c in the modified example is elastically deformed by being pulled in the longitudinal direction L by the tightening portions 12e and 14f when the head portion 12 rotates. Accordingly, in the modified example, the elastic body portion 18 urges the handle portion 12 in the backward direction B, similarly to the case where the elastic portion 18 is formed separately from the head portion 12 and the handle portion 14.

  FIGS. 8A, 8B, 9A, 9B, and 10A, 10B illustrate a third embodiment of the present invention. In each figure, reference numeral 21 denotes an infant toothbrush, and the infant toothbrush 21 has a buffer part 26 at a position between the head part 22 and the handle part 24. The boundary between the head part 22 and the buffer part 26 and the boundary between the handle part 24 and the buffer part 26 are respectively represented by virtual lines.

  The buffer part 26 is configured by a rectangular parallelepiped hinge part 26 a sandwiched between the head part 22 and the handle part 24. As shown in FIGS. 8A and 8B and FIGS. 10A and 10B, the hinge portion 26a opens in the front direction F, and has an inverted V-shaped groove 26b in a front view. Moreover, the hinge part 26a has the neck area | region 26c bundled up and down in these figures in the reverse side B side of the deepest part of the V-shaped groove 26b. Further, the hinge part 26a has a rotation axis Cb that passes through the neck region 26c in the vertical direction in FIGS. 9A and 9B showing a plan view and a bottom view.

  The hinge portion 26a is a molded product of a thermoplastic resin such as polypropylene or saturated polyester resin that is integrally molded together with the head portion 22 and the handle portion 24. Since the hinge portion 26a is constricted in the neck region 26c, the hinge portion 26a can be easily bent and elastically deformed around the rotation axis Cb.

  The hinge portion 26a has a stopper portion 26d that protrudes from the neck region 26c. The stopper portion 26d is provided so as to extend from the neck region 26c toward the base end 25 in the longitudinal direction L as shown in FIGS. 8A and 10A when the head portion 22 is not rotating. The stopper portion 26d has a first stop surface 26e facing the front direction F as shown in FIGS. 10 (a) and 10 (b).

  The hinge portion 26a has a second restraining surface 26f facing the reverse side B on the proximal end 25 side with respect to the neck region 26c. In the state where the head portion 22 is not rotating as shown in FIG. 10A, the respective restraining surfaces 26e and 26f face each other and contact each other. A substantially pentagonal columnar portion sandwiched between the V-shaped groove 26b, the second stop surface 26f, and the bottom surface is referred to as a handle-side region 26g. Further, a substantially triangular prism portion on the head portion 22 side is referred to as a head side region 26h. A head side region 26h is located at the end of the buffer portion 26 on the distal end 23 side, and a handle side region 26g is located at the same end on the proximal end 25 side. Other configurations are common to the second embodiment.

  The head portion 22 can be rotated in the front direction F around the rotation axis Cb, as shown in FIGS. 8B and 10B, as the neck region 26 c of the hinge portion 26 a is bent due to elastic deformation.

  Even when a force is applied to rotate the head portion 22 in the backward direction B, the restraining surfaces 26e and 26f come into contact with each other, and the stopper portion 26d restrains the rotation of the head portion 22 in the backward direction B.

  For example, when the head portion 22 starts to rotate backward B from the state of FIG. 10B, the first restraining surface 26e becomes the second restraining surface 26f along the rotation circle T about the rotation axis Cb. Get closer to. When the dihedral angle θ2 between the respective restraining surfaces 26e and 26f becomes 0 and the state shown in FIG. 10A is reached, the restraining surfaces 26e and 26f come into contact with each other. Therefore, the head part 222 cannot be rotated in the reverse direction B any more.

  In addition, in this embodiment, the 1st contact member is another name for the stopper part 26d which has the 1st stop surface 26e. The second contact member is another name for the handle side region 26g having the second stop surface 26f.

  The elastic body portion 28 can be elastically deformed in any direction including the circumferential direction W and the longitudinal direction L. The elastic body portion 28 is formed by two-color molding together with the head portion 22, the handle portion 24 and the buffer portion 26. Further, as shown in FIG. 10A, the elastic body portion 28 has a cylindrical shape, the inner wall 28a on the head portion 22 side is in close contact with the peripheral surface of the tightening portion 22e of the head portion 22, and the handle portion 24 side. The inner wall 28b is in close contact with the peripheral surface of the tightening portion 24f of the handle portion 24.

  Since the elastic body portion 28 is formed by being pulled in the circumferential direction W by two-color molding, the inner walls 28a and 28b tighten the circumferential surfaces inward in the radial direction by contraction force, and the head portion 22 and the handle portion. 24 is fixed. The back-side peripheral wall 28c, which is a peripheral wall located in the reverse direction B of the elastic body portion 28, is pulled in the longitudinal direction L by the above-described tightening locations and elastically deformed.

  Therefore, as shown in FIG. 10B, after the neck region 26c is bent, the elastic body portion 28 tries to restore the original shape, and the back-side peripheral wall 28c urges the handle portion 22 backward B.

  In the infant toothbrush 21, the head portion 22, the handle portion 24, and the buffer portion 26 are integrally formed, and therefore, these can be formed at a time. In addition, the elastic body portion 28 can be integrated at a time by two-color molding. Accordingly, it is not necessary to separately form the head portion 22, the handle portion 24, and the elastic body portion 28, and to assemble them, so that the process required for manufacturing the infant toothbrush 21 can be shortened.

  The hinge portion 26a has a rectangular parallelepiped shape as long as it has a neck region 26c that is open in the front direction F, bends about the rotation axis Cb, and has a stopper portion 26d that protrudes from the neck region 26c. For example, a cylindrical shape having a center line in the longitudinal direction L, a triangular prism shape, a prism shape other than a triangular prism or a rectangular parallelepiped, a truncated cone shape, and the like may be used.

  Further, the opening in the front direction F of the hinge portion 26a is not limited to the inverted V shape. As long as the space required for the handle portion 22 to bend at the opening portion as shown in FIGS. 8B and 10B can be secured, the opening portion may be, for example, an inverted U shape or a semicircular shape.

  Furthermore, the stopper portion 26d is not limited to a structure extending from the neck region 26c to the base end 25 side in the longitudinal direction L. For example, it may be configured to extend from the neck region 26c to the tip 23 side and contact the head side region 26h of the hinge portion 26a. At this time, the first contact member is another name for the head side region 26h, and the second contact member is another name for the stopper portion extending toward the tip 23 side.

  As mentioned above, although embodiment of this invention was described, this invention is not limited to these embodiment, A various change is possible in the range which does not deviate from the meaning of this invention.

  For example, when the head portions 2, 12, and 22 do not rotate, the center axis of the head portions 2, 12, and 22 and the center axis of the handle portions 4, 14, and 24 are the center axes of the infant toothbrushes 1, 11, and 21, respectively. It is not necessary to substantially coincide with Ca, and if the heads 2, 12, 22 rotate in the front direction F around the buffer parts 6, 16, 26, the center axes of the head parts 2, 12, 22 are centered in advance. You may incline with respect to the axis line Ca.

  Further, the handle portions 4, 14, and 24 do not have the bulging portions 4a, 14a, and 24a as long as the users A and C have a length and thickness that can be easily gripped by fingers. Also good.

  Further, if the elastic body portions 18 and 28 are structured to urge the handle portions 12 and 22 backward B by pulling the back side peripheral walls 18c and 28c, the end portions on the side of the handle portions 14 and 24 as shown in the respective drawings. Is not limited to those positioned in front of the bulging portions 14a and 24a, and may have a length that covers substantially the entire handle portions 14 and 24, for example.

  INDUSTRIAL APPLICATION This invention can be utilized for the toothbrush for infants which can buffer an impact force.

1,11,21 Toothbrushes for infants 2,12,22 Head portions 2b, 12b Rotating plate portions 2c, 12c Rotating shaft portions 3, 13, 23 Tips 4, 14, 24 Handle portions 4a, 14a, 24a Swelling portion 4c, 14c Bracket part 5,15,25 Base end 6,16,26 Buffer part 26a Hinge part 7,17,27 Brush 18,28 Elastic body part

Claims (10)

A toothbrush for an infant having a head portion on the distal end side in the longitudinal direction, and a columnar handle portion on the proximal end side.
A buffer portion is provided between the head portion and the handle portion,
The buffer portion is bent so that the head portion is displaced in a direction perpendicular to the flocked surface on which the brush is planted, and shock force acting from the base end toward the head portion is buffered. Toddler toothbrush. 2. The infant toothbrush according to claim 1, wherein the head portion has restraining means for restraining the handle portion from bending toward the back of the flocked surface. 3. The infant toothbrush according to claim 1, further comprising a biasing unit that biases the head part so that the head part is restored to its original position when the head part is displaced. A toothbrush for an infant having a head portion on the distal end side in the longitudinal direction, and a columnar handle portion on the proximal end side.
A buffer portion is provided between the head portion and the handle portion,
The buffer portion has a rotation center line orthogonal to the center axis of the handle portion,
The infant toothbrush, wherein the head portion is rotatable around the rotation center line with respect to the handle portion. The said buffer part is arrange | positioned in the position within 50 mm from the said front-end | tip. The infant toothbrush of Claim 4 characterized by the above-mentioned. A first contact member that rotates integrally with the head portion is provided;
On the handle part side, a second contact member fixed on a rotation circle of the first contact member is provided,
The second abutting member abuts on the first abutting member, and prevents the handle portion from rotating backwardly on the flocked surface on which the brush is implanted. Infant toothbrush. An elastic body that integrally covers the buffer portion side end of the head portion and the buffer portion side end of the handle portion;
The elastic body is fixed to the head portion and the handle portion by tightening each buffer portion side end inward in the radial direction of the central axis, and is deformed by the rotation of the head portion. The infant toothbrush according to claim 6, wherein the head portion is urged toward the back of the flocked surface by elasticity. The infant toothbrush according to claim 7, wherein the elastic body is integrally molded with the head portion, the handle portion, or the head portion and the handle portion. In the buffer portion, one of the head portion and the handle portion has a support shaft on the rotation center line,
The infant toothbrush according to claim 7 or 8, wherein the head portion is pivotally attached to the handle portion via the support shaft. The buffer portion has a hinge portion that can be bent around the rotation center line,
The head portion and the handle portion are formed integrally with the hinge portion,
The toothbrush for infants according to claim 7 or 8, wherein the head part rotates with elastic deformation of the hinge part.