JP2018202004A - Toothbrush for infant - Google Patents

Abstract

To provide a toothbrush for infant which directly receives an impact when an infant overturns, is capable of easily cushioning such impact force, and facilitates adjusting the strength of rubbing the teeth.SOLUTION: A toothbrush 11 for infant includes a head part which an infant holds in the mouth at a tip side in the longitudinal direction, and a columnar handle part at a base end 15 side. The handle part has a cushioning part 17 in the base end 15, and cushions an impact force acting toward the head part from the base end 15 with the deformation of the cushioning part 17.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a toothbrush, and more particularly to a toothbrush having a handle portion provided with a buffer portion.

  2. Description of the Related Art Conventionally, there is a toothbrush having a head portion on the distal end side where a brush for cleaning the user's teeth is implanted, and a columnar handle portion grasped by the user's fingers on the proximal end side.

  A conventional toothbrush has a circumferential groove at a boundary located at the boundary between the handle portion and the handle portion, and a molded product of an annular thermoplastic elastomer is fitted so as to fill the groove. There is a thing (patent document 1).

  Such a conventional toothbrush can be elastically deformed and bent in the vicinity of the boundary portion because the boundary portion includes a thermoplastic elastomer molded product with respect to the force applied to the handle portion. Therefore, even when the user applies a strong force to the handle portion, the boundary portion serves as a cushion, and the pressure with which the brush rubs the user's teeth can be reduced, and there is little risk of damaging the teeth and gums. .

Special Table 2003-51682

  The conventional toothbrush described in Patent Document 1 has a flexible region including a thermoplastic elastomer molded product at the boundary located at the boundary between the head portion and the handle portion, and thus bends in the vicinity of the boundary portion. It is a possible structure.

  By the way, when the user is an infant around 3 years old, it is known that the user tends to walk around while holding the head portion in the mouth from the tip of the toothbrush. When such an infant trips over an obstacle or the like and falls down, the hand is released while holding the toothbrush, and the proximal end of the toothbrush is an obstacle under the floor, furniture, ground, or the like (hereinafter referred to as “floor”). The situation where it hits is easy to occur. For this reason, toothbrushes used by infants about 3 years old may hurt the infant's throat by the tip when the base end hits the floor or the like and the impact is transmitted to the head portion.

  In general, tooth brushing for infants is generally insufficient only by the infant's own tooth brushing, and in many cases, after the infant uses the toothbrush, the same brush is used to finish brushing the adult's teeth by the adult.

  In the conventional toothbrush, since the flexible region is located at the boundary portion, the flexible region does not contact the floor even when it hits the floor. Therefore, the conventional toothbrush does not have a structure in which the flexible region directly receives an impact from a floor or the like.

  Furthermore, this conventional toothbrush has a structure in which a molded product of an annular thermoplastic elastomer is fitted so as to fill the groove in the boundary portion, and the flexible region does not extend to the inside of the annular body. The length of the annular body in the longitudinal direction is limited to a length that fills the width of the circumferential groove. For this reason, even when the impact force when the infant falls is indirectly received, the annular body is only compressed at the maximum length, and does not deform enough to receive the impact.

  Therefore, the conventional toothbrush does not have a structure for directly receiving the impact, and the annular body is not deformed so as to absorb the impact force, and the impact force is sufficiently buffered. Is difficult.

  In addition, since the boundary portion of the conventional toothbrush is elastically deformed, when the infant himself or an adult who performs finish polishing grips the handle portion and rubs the infant's teeth, a delicate force is applied. It is difficult to adjust.

  In view of such a problem, the present invention can easily adjust the degree of force of rubbing teeth, and directly receives an impact when an infant falls, and easily cushions the impact force. An object of the present invention is to provide a toothbrush for infants.

  The present invention is an infant toothbrush having a head portion that is attached to the mouth of the infant on the distal end side in the longitudinal direction and a columnar handle portion on the proximal end side. The handle portion includes a handle main body portion and a shock absorber. And the buffer portion is provided at the base end, and provides an infant toothbrush characterized in that the hardness is smaller than the hardness of the head portion and the handle main body portion.

  That is, the buffer portion is provided on the base end side and is more flexible than the other portions of the infant toothbrush. Therefore, when the infant toothbrush receives an impact from the base end, the impact can be directly received by the flexible buffer portion.

  The handle portion has a concave portion that is recessed from the distal end side of the buffer portion toward the proximal end, and a convex portion that protrudes from the proximal end side of the handle body portion toward the proximal end. The buffer portion may have a coupling region where the concave portion and the convex portion are coupled to each other at a part on the tip side in the longitudinal direction.

  That is, in the buffer portion, a part on the tip side in the longitudinal direction includes the convex part inside, and a part other than the part does not include the convex part. In the portion not including the convex portion, the buffer portion having a small hardness is deformed in a free direction without being obstructed by the convex portion, so that it is easy to buffer the impact force.

  Moreover, the range of 20-75 may be sufficient as the type A durometer hardness prescribed | regulated to at least one of JISK6253-3 and JISK7215 in the surface of the said buffer part.

  That is, by suppressing the hardness to a small value, the buffer portion can be deformed so as to sufficiently receive the impact.

  Furthermore, in the longitudinal direction, the ratio of the length of the buffer portion to the entire length may be in the range of 30 to 80%.

  That is, the buffer portion can receive an impact force from the floor or the like for a length of 30% or more of the entire infant toothbrush. Therefore, the infant toothbrush can easily buffer this impact force.

  Moreover, since the buffer portion occupies 80% or less of the entire length of the infant toothbrush, the head portion and the handle main body portion can be arranged in the remaining length. As a result, the infant toothbrush has a sufficient area for planting the brush in the head portion, and the user can easily operate when brushing the teeth, so that the force can be easily adjusted.

  As a result, the toothbrush for infants can easily adjust the force of rubbing the teeth, and can directly absorb the impact when the infant falls, and can easily buffer this impact force. .

  The present invention is an infant toothbrush having a head portion on the distal end side in the longitudinal direction and a columnar handle portion on the proximal end side, the handle portion having a buffer portion at the proximal end. An infant toothbrush is provided, wherein shock force acting from the base end toward the head portion is buffered by deformation of the buffer portion.

  That is, the infant toothbrush of the present invention has a structure capable of directly receiving the impact force from the proximal end by deformation of the buffer portion. And since a buffer part is provided in a handle part, while the user is holding the said handle part for brushing, the toothbrush for infants will not bend by the force for rubbing a tooth.

  Therefore, the toothbrush for infants can be deformed when the infant falls and buffer the impact force, and can easily adjust the force of rubbing the teeth without being deformed during normal tooth brushing. .

  The buffer portion may be bent so that the base end is displaced to a position away from the central axis of the handle portion by elastic deformation.

  That is, the base end is a free end and can be displaced to a position away from the central axis without being restricted by other members. With such a structure, the infant toothbrush can be bent and deformed greatly, and the impact force from the other end can be easily buffered.

  The buffer portion may include a molded product of a thermoplastic elastomer.

  It is known that a thermoplastic elastomer has rubber elasticity at room temperature, is flexible, and can be molded by a molding method similar to ordinary plastics. Therefore, it is suitable as a material for the buffer portion. At the same time, making use of flexibility and adhesiveness with other resins, it can be molded by composite molding with parts other than the buffer portion, such as two-color molding, and an infant toothbrush is efficiently manufactured. It becomes possible.

  As a result, in the present invention, it is possible to easily provide a baby toothbrush that can adjust the force application and absorb the impact force.

  Further, the handle portion has a handle body portion on the distal end side, the head portion and the handle body portion are integrally formed, and the buffer portion extends from the handle body portion in the longitudinal direction. Also good.

  That is, since the head portion and the handle main body portion are integrally formed, the user can efficiently transmit the force of the fingers to the head portion by operating the handle main body portion while brushing teeth. It is possible to adjust the amount of subtle power. At this time, since the buffer portion extends from the handle main body portion in the longitudinal direction, the user can hold the handle portion of the infant toothbrush with good balance.

  Thus, the infant toothbrush can easily absorb the impact force when the infant falls, and at the same time, can easily adjust the amount of force applied to rub the teeth.

  As described above, according to the present invention, it is possible to easily adjust the condition of the force of rubbing teeth with the infant toothbrush and to easily absorb the impact force applied when the infant falls.

BRIEF DESCRIPTION OF THE DRAWINGS (a) is a front view of the toothbrush for infants which shows the 1st Embodiment of this invention, (b) is a rear view. It is a right view of the toothbrush for infants which shows the 1st Embodiment of this invention. It is explanatory drawing which shows the use condition of the toothbrush for infants in the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS (a) is front sectional drawing of the toothbrush for infants which shows the 1st Embodiment of this invention, (b) is right side sectional drawing. (A) And (b) is explanatory drawing which shows the manufacture process of the toothbrush for infants in the 1st Embodiment of this invention. (A) And (b) is explanatory drawing which shows the state which the toothbrush for infants in the 1st Embodiment of this invention deform | transforms. It is a front view of the infant toothbrush which shows the 2nd Embodiment of this invention. It is explanatory drawing which shows the use condition of the infant toothbrush in the 2nd Embodiment of this invention. It is explanatory drawing which shows the state which the toothbrush for infants in the 2nd Embodiment of this invention deform | transforms.

  1 to 6 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 the front view of FIG. 1A, the infant toothbrush 1 has a head portion 2 on the distal end 3 side in the longitudinal direction L and a columnar handle portion 4 on the proximal end 5 side. The handle portion 4 is provided with a handle main body portion 6 on the distal end 3 side and a buffer portion 7 on the proximal end 5 side. The head portion 2, the handle main body portion 6, and the buffer portion 7 are arranged linearly along the central axis Ca in the longitudinal direction L of the infant toothbrush 1. In the figure, the arrow with the symbol W represents the left-right direction of the infant toothbrush 1, and the left side is the left direction and the opposite direction is the right direction in FIG.

  As shown in FIGS. 1 (a), 1 (b) and 2, the infant toothbrush 1 has a bulging portion 6a in which the handle body portion 6 protrudes leftward and rightward in the left-right direction W and forwardly in the front-rear direction T. Have. Further, the head portion 2 and the handle main body portion 6 are integrally formed. As indicated by the phantom line in the figure, the head portion 2 is the head portion 2 on the distal end 3 side of the reduced width portion, and the base end 5 with respect to the reduced width portion that is reduced in the left-right direction W from the bulging portion 6a to the distal end 3 side. The side is the handle body 6.

  As shown in FIG. 3, the infant toothbrush 1 brushes the tooth while the infant C holds the handle portion 4 with the fingers F and palm P. At this time, the infant C supports the handle portion 4 between the fingers F, between the fingers F and the palm P, or between the fingers F and between the fingers F and the palm P.

  As shown in the side view of FIG. 2, the brush 8 is implanted in the head portion 2. An infant C who is a user of the infant toothbrush 1 grips the handle portion 4 and presses the brush 8 against the teeth via the head portion 2 to brush the teeth. In the figure, arrows with a symbol T represent the front-rear direction of the infant toothbrush 1, the direction of the tip of the brush 8 is forward, and the opposite direction is backward.

  The head portion 2 is a molded product of engineering plastics such as general-purpose resins such as polypropylene and polystyrene or saturated polyester resins. As described above, since the head portion 2 and the handle body portion 6 are integrally formed, the material of the handle body portion 6 is the same as the material of the head portion 2. Therefore, the handle body portion 6 of the handle portion 4 is a molded product of a general-purpose resin such as polypropylene or polystyrene or an engineering plastic such as a saturated polyester resin.

  In the handle portion 4, as shown by the hide lines in FIGS. 1A and 1B and FIG. 2, a convex portion 6 b that protrudes from the base end 5 side of the handle body portion 6 toward the base end 5 in the longitudinal direction L. And the recessed part 7a dented from the front-end | tip 3 side of the buffer part 7 toward the base end 5 of the longitudinal direction L adheres. When these fixed states are represented by a front sectional view and a right sectional view, they are as shown in FIGS. Since the convex portion 6b is formed integrally with the handle main body 6, the material is the same as the material of the handle main body 6 described above.

  4 (a) and 4 (b), the handle main body 6 has an annular flange portion 6c that surrounds the front, rear, left and right of the convex portion 6b, and the buffer portion 7 has an annular shape that surrounds the front, rear, left and right of the concave portion 7a. There is a flange portion 7b. The flange portions 6c and 7b are fixed to each other.

  In the longitudinal direction L of the handle portion 4, a region where the convex portion 6 b and the concave portion 7 a are fixed to each other and a portion where the flange portions 6 c and 7 b are fixed to each other is called a coupling region Lo of the buffer portion 7. . That is, the buffer part 7 includes the convex part 6b on the inner side in the coupling region Lo. As shown in each figure, the buffer portion 7 has a coupling region Lo only at a part on the tip 3 side. And in the single area | region Lp other than the coupling | bonding area | region Lo, the convex-shaped part 6b is not included inside.

  In the buffer part 7, the coupling region Lo occupies a length less than ¼ on the tip 3 side with respect to the buffer part length L 2 that is the length of the buffer part 7 in the longitudinal direction L. As a result, the buffer portion 7 occupies a length of 3/4 or more of the buffer portion length L2 in the longitudinal direction L by the single region Lp on the base end 5 side.

  Of the handle part 4, the buffer part 7 includes a flexible part 7c formed of a thermoplastic elastomer. 5A and 5B show the manufacturing process of the buffer portion 7. After the head portion 2 and the handle main body 6 are integrally formed as shown by a solid line in FIG. 5A, the flexible portion 7c is formed by the head portion 2 and the handle main body 6 as shown by a virtual line. It is molded by two-color molding together with the molded product.

  That is, the molded head part 2 and the handle main body part 6 are inserted into a mold for injection molding, and a thermoplastic elastomer is injected around the head part 2 and the handle main body part 6, so that the head part 2 and A mold is formed integrally with the handle body 6. FIG.5 (b) shows the image of the external appearance after the flexible part 7c was shape | molded by 2 color molding.

  At this time, a thermoplastic elastomer is injected to the outer side in the radial direction of the convex portion 6b, the die is molded, and the flexible region 7c surrounds the outer side to form the coupling region Lo. Therefore, the cross section of the coupling region Lo is configured in two layers in the radial direction, the cross section on the central axis Ca side is occupied by the convex portion 6b whose material is the same as the material of the handle body 6, and the cross section on the surface side. Is occupied by the flexible portion 7c of the thermoplastic elastomer. On the other hand, the cross section of the single region Lp is configured as a single layer, and the entire cross section is occupied by the flexible portion 7c of the thermoplastic elastomer.

  In addition, in the two-color molding of the flexible portion 7c, in order to increase the fixing force between the convex portion 6b and the concave portion 7a, the ratio of the length in the longitudinal direction L of the coupling region Lo to the buffer portion length L2 is 10% or more. desirable. This is because the surface area for fixing the convex portion 6b and the concave portion 7a to be larger can be taken.

  The buffer portion 7 includes a flexible portion 7c made of a material having a low hardness such as a thermoplastic elastomer, so that the infant C falls while holding the head portion 2 of the infant toothbrush 1 in the mouth, and the proximal end 5 Even when it hits an obstacle at the foot of the floor, furniture, ground, etc. (hereinafter referred to as “floor etc.”), it deforms and bends as shown in FIGS. You can catch the shock of.

  The solid line in FIG. 6A shows a state in which the buffer portion 7 is deformed to the right in the left-right direction W with respect to the central axis Ca from the state represented by the phantom line due to the impact from the base end 5. FIG. 6B shows a state in which the buffer portion 7 is deformed rearward in the front-rear direction T with respect to the central axis Ca from the state represented by the phantom line due to the impact from the base end 5. The flexible portion 7c of the impact portion 7 is elastically deformed and restored to its original state when the base end 5 is separated from the floor or the like after the infant C falls down.

  At this time, the base end 5 can be displaced to a position away from the central axis Ca along the trajectory represented by the arrow Ma in FIG. 6A or the trajectory represented by the arrow Mb in FIG. Further, the base end 5 can be displaced along a trajectory in which the trajectory Ma in the left-right direction W and the longitudinal direction L and the trajectory Mb in the front-rear direction T and the longitudinal direction L are combined in a plan view of each figure.

  The buffer portion 7 is located on the proximal end 5 side of the infant toothbrush 1 and can receive an impact directly when the proximal end 5 comes into contact with the floor or the like. Further, since the base end 5 is not constrained by any other part of the infant toothbrush 1, it can be displaced in the direction in which it can bend most easily and absorb the impact according to the direction of impact from the floor or the like.

  In addition, the buffer portion 7 is free in the horizontal direction W, the front-rear direction T, the longitudinal direction L, or the direction in which the single region Lp of the thermoplastic elastomer occupying 3/4 or more in the longitudinal direction L is combined. Due to the deformation, the base end 5 is greatly displaced, and the impact from the floor or the like can be easily absorbed.

  As described above, the infant toothbrush 1 deforms the flexible portion 7c of the buffer portion 7 without being obstructed by the inner convex portion 6a, and displaces the base end 5 to a position further away from the central axis Ca. Can do.

  The thermoplastic elastomer that is the material of the flexible part 7c includes olefin-based thermoplastic elastomers such as “Milastomer” (registered trademark) sold by Mitsui Chemicals, Inc., and “Lavalon” (registered trademark) sold by Mitsubishi Chemical. ) And other styrenic thermoplastic elastomers are used.

  By the way, Japanese Industrial Standard JIS K6253-3 “Vulcanized Rubber and Thermoplastic Rubber—How to Obtain Hardness—Part 3: Durometer Hardness” defines how to obtain durometer hardness of vulcanized rubber and thermoplastic rubber. . In addition, Japanese Industrial Standard JIS K7215 “Testing Method for Plastic Durometer Hardness” defines a method for measuring plastic durometer hardness. These standards specify multiple types of durometer hardness, and the specifications include specifications for type A durometer hardness.

  Olefin-based thermoplastic elastomers having a type A durometer hardness of 40 to 91 are commercially available, for example. In addition, styrene thermoplastic elastomers having a type A durometer hardness of 15 to 88 are commercially available.

  On the other hand, in order to effectively deform the buffer portion 7 so that the base end 5 draws the trajectories Ma and Mb as described above, the type A durometer hardness is in the range of 20 or more and less than 75. It was found by the prototype of the infant toothbrush 1. Therefore, a material having a type A durometer hardness of 20 or more and less than 75 is used as the material of the flexible portion 7c.

  In addition, in order for the infant C to grip the handle portion 4 in order to perform normal tooth brushing, it is desirable that the buffer portion 7 has a certain hardness or more, and the hardness for that is the type A durometer hardness. Was found to be 40 or more. On the other hand, when the impact of the infant C when falling is large, in order to absorb more impact and prevent accidents, it is desirable that the hardness of the buffer 7 is smaller, and the type A durometer hardness is less than 60 It has been found that the degree of impact absorption increases significantly.

  As shown in FIG. 3, the buffer unit 7, together with the handle body unit 6, is between the fingers F of the infant C, between the fingers F and the palm P, or between the fingers F and between the fingers F and the palm P. Supported in between.

  The infant toothbrush 1 is also used for “finish polishing” in which the adult A brushes a portion of the infant C that is not polished after the infant C brushes his / her teeth. At this time, the buffer 7 is supported by the finger F and palm P of the adult A as in the case of the infant C. Hereinafter, the infant C and the adult A who use the infant toothbrush 1 are collectively referred to as “users A and C”.

  When the users A and C hold the infant toothbrush 1 and brush their teeth as shown in FIG. 3, they hold the handle body 6 and the buffer 7 together with their fingers F, or the fingers F and palm P The handle body 6 and the buffer 7 are gripped at the same time so as to be sandwiched between them. Thus, since the buffer part 7 is grasped by the fingers F while the users A and C brush their teeth, the buffer part 7 can be bent as shown in FIGS. 6A and 6B by the force for rubbing the teeth. Absent.

  As a result, the infant toothbrush 1 can be deformed and bent when the infant C falls, can cushion the impact force, and can be rubbed by the users A and C without bending during normal brushing. It is possible to easily adjust the degree of insertion.

  A material harder than the flexible portion 7 c is used as the material of the head portion 2 and the handle main body portion 6. That is, when polypropylene, polystyrene, saturated polyester resin, or the like is used, the Rockwell hardness specified by Japanese Industrial Standard JIS K7202-2 “Plastics—Method of obtaining hardness—Part 2: Rockwell hardness” is 80 or more. Use one. A resin having a Rockwell hardness of 80 or more has a type A durometer hardness of more than 90 and is harder than the flexible portion 7c.

  Among these resins, when polypropylene is used as the material of the head portion 2 and the handle main body portion 6, for example, “Novatec” (registered trademark) sold by Nippon Polypro Co., Ltd. has a Rockwell hardness of 80 to 110. For example, among “Prime Polypro” (registered trademark) sold by Prime Polymer Co., Ltd., a grade having a Rockwell hardness of 90 to 95 is used.

  Thus, the handle body 6 is molded integrally with the head 2 and is hard. Therefore, as shown in FIG. 3, the users A and C are less likely to disperse the force of the fingers F and palm P supporting the handle main body 6 by deformation when gripping the infant toothbrush 1. Such a force can be efficiently transmitted to the head portion 2 via the handle body portion 6. In addition, the users A and C can adjust the amount of subtle force applied by operating the head portion 2 and the handle main body portion 6 having high hardness.

  Further, since the buffer portion 7 extends from the handle main body portion 6 in the longitudinal direction L along the central axis Ca, the center of gravity of the infant toothbrush 1 in the longitudinal direction L is located at the handle portion 4. Thus, the users A and C can hold the infant toothbrush 1 in a well-balanced manner by gripping the handle portion 4.

  The ratio of the buffer portion length L2 to the entire length L1 that is the length in the longitudinal direction L of the entire infant toothbrush 1 is in the range of 30 to 80%. When the buffer portion length L2 occupies 30% or more, the buffer portion 7 can receive the impact force from the floor or the like due to the deformation of the flexible portion 7c.

  In addition, since the head portion 2 and the handle main body portion 6 occupy a length of 20% or more, the head portion 2 can have a sufficient area where the brush 8 is implanted. Moreover, since the head part 2 and the handle body part 6 are harder than the flexible part 7c and occupy a length of 20% or more, it is easy for the users A and C to operate when brushing their teeth. This makes it possible to easily adjust the condition of the case.

  The ratio of the buffer portion length L2 to the entire length L1 may be within a range of 60% or less. Since the head part 2 and the handle body part 6 occupy 40% or more of length, the users A and C can easily adjust the degree of force of rubbing their teeth.

  Moreover, since the overall length L1 is generally around 125 mm in the infant toothbrush 1, the ratio of the buffer portion length L2 is within the range of 30 to 60%, so that the infant C holds the handle portion 4 with the fingers F and palm P. This makes it easier to grip and reduces accidents due to unnatural holding.

  7 to 9 illustrate a second embodiment of the present invention. In FIG. 7, reference numeral 11 denotes an infant toothbrush. The infant toothbrush 11 has a head portion 12 on the distal end 13 side in the longitudinal direction L and a columnar handle portion 14 on the proximal end 15 side. The handle portion 14 is provided with a handle main body portion 16 on the distal end 13 side and a buffer portion 17 on the proximal end 15 side.

  The head portion 12, the handle main body portion 16, and the buffer portion 17 are arranged linearly along the central axis Ca in the longitudinal direction L of the infant toothbrush 11. The buffer portion length L2 in this embodiment occupies about 60% with respect to the overall length L1.

  As shown in FIG. 8, the users A and C brush their teeth with the infant toothbrush 11 while holding the handle portion 14 with their fingers F and palm P. At this time, the users A and C support the handle portion 14 between the fingers F, or between the fingers F and between the fingers F and the palm P.

  The head portion 12 has a columnar columnar region 12a on the proximal end 15 side whose center axis coincides with the center axis Ca of the infant toothbrush 11. The handle body 16 is formed in a substantially frustoconical shape whose center axis coincides with the center axis Ca of the infant toothbrush 11.

  The cylindrical region 12a of the head portion 12 and the handle main body portion 16 are such that the edge 12b on the proximal end 5 side of the cylindrical region 12a as shown by an imaginary line in FIG. It coincides with the ridge line with the conical surface and continues in the longitudinal direction L at the edge 12b. Therefore, the distal end 13 side of the end edge 12b is the head portion 12, and the proximal end 15 side of the end edge 12b is the handle body portion 16. Other configurations are the same as those in the first embodiment.

  Also in this embodiment, the length in the longitudinal direction L of the single region Lp with respect to the buffer portion length L2 occupies 3/4 or more. Since the single region Lp of the thermoplastic elastomer is long, the base end 15 is greatly displaced to the right while drawing a trajectory Ma ′ in the left-right direction W and the longitudinal direction L shown in FIG. Shock can be absorbed easily.

  Note that the columnar region indicated by reference numeral 12a in FIG. 7 in the head portion 12 is not limited to a columnar shape, and the cross section is an ellipse, a rectangle, a polygon other than a rectangle, etc. The shape may be acceptable. Further, the handle main body 16 is not limited to a substantially truncated cone shape, and is substantially a truncated cone as long as it has a shape continuous with the head portion 12 and can be easily gripped by the fingers A and C. It may be a quadrangular pyramid shape, a substantially truncated pyramid shape other than a quadrangular pyramid, or the like.

  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, the flange portions 6c and 16c of the handle main body portions 6 and 16 and the flange portions 7b and 17b of the buffer portion 7 may not be provided. That is, if the convex portions 6b and 16b and the concave portions 7a and 17a are firmly fixed irrespective of before and after the deformation of the flexible portions 7c and 17c, the handle body portions 6 and 16 and the convex portions 6b and 16b are fixed. The boundary between and may be smooth.

  The convex portions 6b and 16b and the concave portions 7a and 17a may be fixed by a method other than two-color molding. For example, the flexible portions 7c and 17c having the concave portions 7a and 17a may be formed in advance and fixed with an adhesive or the like so as to insert the convex portions 6b and 16b.

  If the material of the flexible parts 7c and 17c has a type A durometer hardness of 20 or more and less than 75, and can be restored to its original state by elastic deformation, for example, heat Other than the plastic elastomer, thermoplastic resins such as EVA resin and vinyl chloride resin, and rubber may be used. In addition to the styrene-based thermoplastic elastomer and olefin-based thermoplastic elastomer mentioned above, a vinyl chloride-based thermoplastic elastomer may be used.

  Furthermore, in the first embodiment, the handle body 6 having the bulging portion 6a projecting in both the left and right directions W and the front and rear direction T is illustrated, and in the second embodiment, the left and right directions W or the front and rear Although the handle main body 16 that does not protrude in any of the directions T and does not have the bulging portion has been illustrated, such a bulging portion is other than these embodiments, for example, either the left-right direction W or the front-back direction T. , One direction in the left-right direction W, the direction in the front-rear direction T, and the like may be used.

  The example in which the head portions 2 and 12, the handle portions 6 and 16, and the buffer portions 7 and 17 are linearly arranged along the common central axis Ca has been described. The arrangement may be such that the axis is inclined forward in the front-rear direction T with respect to the central axis of the handle main body 6, 16.

  In the first embodiment, the buffer unit 7 is deformed rightward, backward, or rightward and backward, and the base end 5 represents a trajectory Ma, a trajectory Mb, or a trajectory in which the trajectory Ma and the trajectory Mb are combined. In addition to these, the buffer portion 7 may be deformed to the left direction, the front direction, or the direction in which the front, rear, left, and right directions are combined. Also in the second embodiment, the buffer portion 17 may be deformed to the left direction, the front direction, the rear direction, or the direction in which the front, rear, left and right directions are combined in addition to the right direction.

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

1,11 Infant toothbrush 2,12 Head part 3,13 Tip 4,14 Handle part 5,15 Base end 6,16 Handle body part 6a Protruding part 6b, 16b Convex part 7, 17 Buffer part 7a, 17a Concave shape Parts 7c, 17c Flexible parts 8, 18 Brush L1 Overall length L2 Buffer part length Lo Binding region Lp Single region

Claims (8)

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.
The handle part is provided with a handle body part and a buffer part,
The said buffer part is provided in the said base end, and hardness is smaller than the hardness of the said head part and the said handle | steering-wheel main-body part. The infant toothbrush characterized by the above-mentioned. The handle portion has a concave portion that is recessed toward the proximal end from the distal end side of the buffer portion, and a convex portion that protrudes toward the proximal end from the proximal end side of the handle main body portion,
2. The infant toothbrush according to claim 1, wherein the buffer portion has a coupling region where the concave portion and the convex portion are coupled to each other at a part of the distal end side in the longitudinal direction. 3. The infant toothbrush according to claim 2, wherein a type A durometer hardness defined in at least one of JIS K6253-3 and JIS K7215 is in a range of 20 to 75 on the surface of the buffer portion. The infant toothbrush according to claim 2 or 3, wherein a ratio of the length of the buffer portion to the entire length in the longitudinal direction is in a range of 30 to 80%. 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.
The said handle | steering-wheel part is equipped with the buffer part in the said base end, and the impact force which acts toward the said head part from the said base end is buffered by the deformation | transformation of this buffer part. The infant toothbrush characterized by the above-mentioned. 6. The infant toothbrush according to claim 5, wherein the buffer portion can be bent by elastic deformation so that the base end is displaced to a position away from a central axis of the handle portion. The said buffer part contains the molded article of a thermoplastic elastomer. The toothbrush for infants of Claim 6 characterized by the above-mentioned. The handle portion has a handle main body portion on the tip side,
The head portion and the handle main body portion are integrally formed,
The infant cushion according to any one of claims 6 and 7, wherein the buffer portion extends from the handle body portion in the longitudinal direction.