CN218528014U - Tooth brush - Google Patents

Abstract

The utility model provides a toothbrush, which can effectively prevent the excessive tooth brushing without damaging the grippability of the toothbrush and can be manufactured at low cost. The toothbrush comprises a head (1) implanted with tufts (10), a neck (2) connected to the head (1), and a handle (3) serving as a grip, wherein the handle (3) has a core (4) formed of a first hard resin integrally formed with the neck (2) and a covering (5) formed by a second hard resin having a property of low adhesion to the first hard resin so as to cover the core (4), the core (4) has a core body (6) embedded in the covering (5) and a movable section (7) provided on the front end side of the core (4), the movable section is displaced by swinging in the opposite direction (B) to the protruding direction (A) of the tufts (10) when subjected to brushing pressure acting on the head (1), and a space section (8) allowing the swinging displacement of the movable section (7) is provided in the front end side section of the covering (5).

Description

Tooth brush

Technical Field

The utility model relates to a toothbrush, which comprises a head part implanted with hair bundles, a neck part connected with the head part and a handle part serving as a handle.

Background

Conventionally, as shown in patent document 1, for example, there is known a toothbrush which is provided with: a head portion provided on the distal end side in the longitudinal direction and having a hair-setting surface; a grip (handle) disposed at a position closer to the rear end than the head; a neck portion arranged between the flocked surface and the holding portion; and a deformable portion including a hard portion formed of a hard resin and disposed on the rear end side of the flocked surface, and a soft portion formed of a soft resin and covering at least a part of the hard portion, wherein the deformable portion is deformed by an external force in a first direction orthogonal to the flocked surface, and the hard portion sandwiches and compresses the soft portion in the longitudinal direction.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2021-7471

SUMMERY OF THE UTILITY MODEL

Technical problem to be solved by the utility model

The toothbrush disclosed in patent document 1 is configured to have a hard portion made of a hard resin and a deformable portion made of a soft resin covering the hard portion, and is disposed between the head portion and the grip portion, and the deformable portion is deformed by an external force in a first direction perpendicular to the surface on which bristles of tufts are implanted. Moreover, the user can sufficiently feel the deformation of the deformation portion that occurs when brushing teeth while holding the grip portion of the toothbrush, and can be prevented from becoming an over brushing (over brushing teeth) state.

As described above, when the deformable portion provided in the grip portion is deformed, the user can perceive the excessive brushing state based on the deformation, and on the contrary, the gripping performance of the toothbrush is deteriorated, which may hinder the brushing operation. Further, since the hard portion is coated with a soft resin made of an elastomer or the like which is more expensive than the hard resin, there is a problem that the manufacturing cost of the toothbrush becomes high. When the deformable portion is deformed by an external force applied during brushing, the hard portion and the soft portion constituting the deformable portion may be separated from each other due to a difference in rigidity between the hard portion and the soft portion.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a toothbrush which can effectively prevent an excessive brushing state without impairing the grippability of the toothbrush, and can be manufactured at low cost.

Technical solution for solving technical problem

The toothbrush of the utility model comprises a head part implanted with tufts, a neck part connected with the head part and a handle part formed as a handle, wherein the handle part comprises: a core member formed integrally with the neck portion and made of a first hard resin; and a covering member formed by a second hard resin having a property of low adhesion (adhesion) with the first hard resin so as to cover the core member, the core member having: a core member main body embedded in the covering member; and a movable part provided on the distal end side of the core body, the movable part being subjected to a brush pressure (brushing pressure) acting in a direction orthogonal to the bristle-implanted surface of the head part, and being subjected to a swinging displacement (swinging displacement) in a direction opposite to the protruding direction of the bristle bundle, wherein a space part that allows (permits) the swinging displacement of the movable part is provided on the distal end side of the covering member.

According to this configuration, the movable portion provided at the distal end portion side of the core member main body made of the second hard resin is allowed to swing and displace in the space portion of the covering member without deforming the covering member made of the second hard resin when the user brushes the teeth. Therefore, the user of the toothbrush can stably grip the covering member positioned on the outer peripheral portion of the handle portion, and can brush teeth by bringing the tufts of the head portion into contact with the teeth, and can also displace the movable portion of the core member in a swinging manner in accordance with the brush pressure. Therefore, the head and the neck of the toothbrush are deformed, so that an excessive brush pressure can be prevented from acting, and appropriate tooth brushing can be performed without causing problems such as deterioration in the gripping performance of the toothbrush due to deformation of the grip portion, as in the conventional art in which the grip portion of the toothbrush is coated with a soft synthetic resin. Moreover, the method has the following advantages: it is possible to select two types of hard resins which are less expensive than elastomers, instead of using a soft resin composed of an expensive elastomer or the like as in patent document 1, and thus to manufacture a toothbrush at a low cost.

Further, the following structure may be adopted: a convex portion for fixing is formed on one of the core member main body and the covering member, and a concave portion into which the convex portion is fitted is formed on the other.

According to this configuration, although the first hard resin constituting the core of the shank and the second hard resin constituting the covering are formed of materials having low adhesion to each other, the covering can be prevented from being pulled out of the core, and the bonded state of the two can be stably maintained.

Preferably, the movable portion includes a first movable portion and a second movable portion provided at a distance in a width direction of the shank portion.

According to this configuration, the first movable portion and the second movable portion can be displaced by a slight force in a swinging manner as compared with a configuration formed by a single plate-like body or the like, and therefore, the flexibility of the toothbrush can be effectively improved.

In addition, it is preferable that the covering member is provided with a spacer portion located between the first movable portion and the second movable portion.

According to this configuration, when the distal end side portion of the covering member is gripped to brush the teeth, the spacer can prevent the fingers of the user from entering the space portion. Therefore, the following advantages are provided: the toothbrush can be operated in a state of stably holding the covering member, and appropriate tooth brushing can be performed.

Preferably, a drain hole for discharging water in the space portion to the outside of the cover is provided in the vicinity of the front end of the cover.

According to this structure, have following advantage: when the toothbrush is stored with the space portion facing upward after use, moisture accumulated in the space portion can be quickly discharged to the outside, and therefore, the toothbrush can be prevented from being sticky and its cleaning performance can be ensured.

Further, the following structure may be adopted: a restricting portion for restricting the swing displacement of the movable portion is provided on a distal end surface of the covering member.

According to this configuration, when the toothbrush is used, the movable portion can be restricted from protruding greatly from the covering member, and the movable portion and the neck portion of the toothbrush can be effectively prevented from coming into contact with the hand of the user. Further, since the behavior of the movable portion changes significantly at the time when the movable portion comes into contact with the restricting portion, the user can clearly recognize the state, and excessive brushing pressure can be prevented from being applied during brushing.

Preferably, the side wall surfaces of the space portion are each formed as a tapered surface that expands outward (flare).

According to this configuration, the movable section can be smoothly swung and displaced along the side wall surface of the space section when the brush pressure acting on the head section of the toothbrush is applied. Therefore, the following advantages are provided: during brushing teeth, the movable part is reliably prevented from rubbing against the side wall surface of the space part to generate uncomfortable abnormal noise, or the smooth swinging displacement of the movable part is prevented from being hindered.

Further, it is preferable that an arc-shaped curved portion which becomes a swing start point of the movable portion is provided on the rear end portion side of the movable portion.

According to this configuration, when the toothbrush is used, the bending portion is expanded and deformed by the brush pressure acting on the head portion, and thereby the movable portion can be smoothly swung and displaced in the direction opposite to the protruding direction of the tufts.

Further, it is preferable that the bent portion is recessed in a direction opposite to a protruding direction of the tufts.

According to this configuration, it is possible to prevent the plate thickness of the covering material covering the bent portion from becoming extremely small, as in the case where the bent portion is recessed in the protruding direction of the bristle bundle, and to sufficiently secure the rigidity of the covering material.

Further, the following structure may be adopted: a gap for preventing fingers and the like from being clamped is arranged between the rear end face of the neck and the front end face of the wrapping piece.

According to this configuration, even if the user's fingers temporarily enter between the rear end surface of the neck and the front end surface of the cover during brushing, the user's fingers can be easily pulled out, and the fingers can be prevented from being pinched by the gap and being subjected to an excessive pinching force.

Further, the following structure may be adopted: a gap for preventing fingers and the like from being pinched is provided between the side wall surface of the space portion and the side end surface of the movable portion.

According to this configuration, even if the user's fingers or the like temporarily enter between the side wall surface of the space portion and the side end surface of the movable portion during brushing, the user's fingers or the like can be easily pulled out, and the user's fingers or the like can be prevented from being pinched by the gap and being subjected to an excessive pinching force.

Preferably, the movable portion has a longitudinal shape portion at least partially, and a dimension (a) in a longitudinal direction of the longitudinal shape portion is larger than a dimension (b) in a lateral direction orthogonal to the longitudinal direction, and the longitudinal direction is orthogonal to the hair-planted surface of the head portion in a cross section of the longitudinal shape portion.

According to this configuration, the lateral dimension (b) of the movable portion can be suppressed to be small while sufficiently ensuring the rigidity of the movable portion, and the width dimension of the space portion corresponding to the lateral dimension (b) of the movable portion can be suppressed from being excessively large, and the grippability of the toothbrush can be maintained to be good. Further, since excessive swinging displacement of the movable portion can be suppressed when the toothbrush is used, there is an advantage that an appropriate brush pressure can be obtained.

Further, it is preferable that the ratio (a)/(b) of the longitudinal dimension (a) to the lateral dimension (b) of the movable portion is 2.2 or less.

According to this structure, have following advantage: the handle of the toothbrush is prevented from being thickened and the holding performance is prevented from being reduced due to the longitudinal dimension (a) of the movable part being too large, and the neck of the toothbrush is prevented from being easily deformed in the transverse direction due to the transverse dimension (a) of the movable part being too small.

Preferably, the movable portion is formed of a single rod-shaped body, and a transverse dimension of the movable portion is 2.5mm to 4.5 mm.

According to this structure, the movable section 7 can be prevented from being lowered in the gripping performance of the toothbrush due to the lateral dimension thereof being larger than 4.5 mm. In addition, the transverse dimension of the movable part is less than 2.5mm, so that the head part of the toothbrush is prevented from being easily shaken transversely.

Effect of the utility model

According to the utility model discloses a toothbrush can obtain as follows effect: excessive brushing can be effectively prevented without impairing the grippability of the toothbrush, and the toothbrush can be produced at low cost.

Drawings

Fig. 1 is a sectional view of a representative embodiment toothbrush of the present invention.

Fig. 2 is a perspective view showing an external shape of the toothbrush of fig. 1.

Fig. 3 is a perspective view showing the toothbrush of fig. 1 in an exploded state into a primary molded article and a secondary molded article.

Fig. 4 is an enlarged sectional view showing the structure of a main part of the toothbrush of fig. 1.

Fig. 5 is a sectional view taken along line V-V of fig. 4.

Fig. 6 is a sectional view showing a state in which a movable portion of the toothbrush of fig. 1 is displaced by oscillation.

Fig. 7 is a perspective view showing a toothbrush according to another embodiment of the present invention.

Fig. 8 is a bottom view showing the structure of the main part of the toothbrush of fig. 7.

Fig. 9 is a cross-sectional view taken along line IX-IX of fig. 8.

Fig. 10 is an explanatory view showing an outer shape of a handle in a modification of the toothbrush shown in fig. 7.

Fig. 11 is an explanatory view showing a state where the toothbrush of fig. 7 is held by a pen-grip method.

Fig. 12 is a rear view showing another modification of the shank.

Fig. 13 is a cross-sectional view showing still another modification.

Fig. 14 is a plan view of a toothbrush according to still another embodiment of the present invention.

Fig. 15 is a sectional view of the line XV-XV of fig. 14.

Fig. 16 is a cross-sectional view of the movable portion of the toothbrush of fig. 14.

Fig. 17 is a cross-sectional view taken along line XVII-XVII of fig. 14.

Fig. 18 is a sectional view of the XV-XV line of fig. 14.

Fig. 19 is a sectional view showing a modification of the movable part of the toothbrush shown in fig. 14.

Fig. 20 is a sectional view showing another modification of the movable portion.

Description of the reference numerals

1. Head part

2. Neck part

3. Handle part

4. Core piece

5. Cladding piece

6. Core main body

7. Movable part

8. Space part

10. Hair bundle

11. Primary formed article

12. Secondary molded article

73. A first movable part

74. Second movable part

75. Bending part

81. Side wall surface

82. Spacer section

83. Restricting part

84. Drain hole

Detailed Description

Hereinafter, embodiments of the toothbrush of the present invention will be described with reference to the drawings. In the drawings, the same reference numerals denote the same components, and a description thereof will be omitted.

Fig. 1 to 4 show a toothbrush according to a representative embodiment of the present invention. The toothbrush comprises: a head part 1 planted with a hair bundle 10; a substantially rod-shaped neck portion 2 connected to a rear end portion of the head portion 1; and a shank 3 which becomes a handle. The handle 3 has: a core member (may also be referred to as "core portion") 4 formed integrally with the neck portion 2 from a first hard resin, for example, a polyacetal resin (POM) or the like; and a covering member 5 formed by a second hard resin so as to cover the core member 4, the second hard resin having a property of low adhesion to the first hard resin, that is, a property of not being mixed with the first hard resin at the time of molding and being separated from each other after molding.

For example, crystalline resins composed of polyacetal resin (POM), polyamide resin (PA), polybutylene terephthalate (PBT), polyacrylic resin (PP), or the like have low adhesion (low adhesion) to each other when the other is crystalline resin (except for PP) or when the other is amorphous resin (i.e., amorphous resin). Therefore, when one of the first hard resin constituting the core member 4 and the second hard resin constituting the covering member 5 is a crystalline resin such as polyacetal resin (POM) and the other is an amorphous resin (i.e., noncrystalline resin) such as acrylonitrile butadiene styrene resin (ABS), polycarbonate (PC), or acrylic resin (PMMA), the first hard resin and the second hard resin are not mixed during molding, and the core member 4 and the covering member 5 can be separated from each other after molding.

Further, in the above-described crystalline resins, the polyacrylic resin (PP) has high adhesion to each other, and therefore, in addition to forming both the first hard resin and the second hard resin from the polyacrylic resin (PP), even when both the first hard resin and the second hard resin are crystalline resins, the core member 4 and the covering member 5 can be prevented from being welded to each other. For example, when one of the first hard resin constituting the core member 4 and the second hard resin constituting the covering member 5 is a crystalline resin such as polyacetal resin (POM) and the other is a crystalline resin such as polyacetal resin (POM), polyamide resin (PA), or polyacrylic resin (PP), the first hard resin and the second hard resin can be prevented from being mixed during molding, and the core member 4 and the covering member 5 can be separated from each other after molding.

As shown in fig. 3, the core 4 includes a substantially rod-shaped core main body 6 embedded in the cladding 5, and a movable portion 7 provided on the distal end side of the core main body 6. An uneven surface 61 formed of an aggregate of triangles is formed on the outer peripheral surface of the core body 6 so as to extend spirally. Further, a convex portion 62 for fastening, which is a pin-shaped body, is formed at a substantially central portion in the longitudinal direction on the abdominal side of the core material body 6, that is, on the implanted side of the tufts 10. In the rear end portion vicinity portion 63 of the core main body 6, fastening protrusions 64 formed of a plurality of plate-like bodies are formed at regular intervals on the web portion side. Further, a truncated cone-shaped portion 65 having a larger diameter toward the rear end side is provided at the rear end portion of the core main body 6.

The movable portion 7 has: a plate-like front end portion 71 extending in the width direction along the rear end surface of the neck portion 2, wherein the neck portion 2 is formed in a truncated cone shape expanding toward the rear side; and a plate-like rear end portion 72 extending in the width direction along the front end surface of the core main body 6. Between the front end 71 and the rear end 72 of the movable portion 7, a first movable portion 73 and a second movable portion 74, which are constituted by a pair of right and left square rod-like bodies extending in the longitudinal direction of the shank 3, are arranged at a predetermined interval in the width direction of the shank 3.

In the vicinity of the rear end portions of the first movable portion 73 and the second movable portion 74, arc-shaped curved portions 75 serving as swing start points of the movable portions 7 are formed so as to be recessed in a direction B opposite to the protruding direction a of the tufts 10. As will be described later, when the toothbrush is used, the bending portion 75 is deformed so as to be opened when it is subjected to a brush pressure in a direction perpendicular to the implanted surface formed by the surface of the head portion 1, whereby the distal end portion 71 of the movable portion 7 is swung and displaced in a direction B opposite to the projecting direction a of the bristle bundle 10 (see fig. 6).

A space 8 is formed in the distal end side portion of the cover 5, the space being constituted by a recessed portion opened in the rear side portion located on the lower side in fig. 5, that is, in the rear side portion of the stem 3. This allows the front end 71 of the movable portion 7 and the first and second movable portions 73 and 74 to swing and displace in the space 8. As shown in fig. 5, side wall surfaces 81, 81 located at both left and right end portions of the space portion 8 are respectively formed as tapered surfaces expanding outward. The covering member 5 is provided with a space 82 between the first movable portion 73 and the second movable portion 74 of the movable portion 7, and the space 8 is divided into left and right portions by the space 82.

A regulating portion 83 formed of a stepped portion facing the distal end portion 71 of the movable portion 7 is provided near the distal end portion of the covering 5, specifically, at the distal end portion of the spacer portion 82 shown in fig. 4 and 5. As shown in fig. 6, the pivotal displacement of the movable portion 7 is regulated at the time when the movable portion 7 is pivotally displaced and the distal end portion 71 abuts against the regulating portion 83. In addition, a drain hole 84 (see fig. 4) for discharging the water in the space 8 in the protruding direction a of the bundle 10 is formed near the distal end of the covering 5.

Next, a method for manufacturing the toothbrush having the above-described structure will be described. First, a primary mold for molding a primary molded article 11 (see fig. 3) in which the head 1, neck 2, and core 4 of the handle 3 of the toothbrush are integrally connected is clamped, and a first hard resin made of a crystalline resin such as polyacetal resin (POM) is injected into the primary mold to mold the primary molded article 11.

Next, after the primary mold is opened, a secondary mold for molding the secondary molded article 12 made of the covering 5 is closed, and a second hardening resin having a property of low adhesion to the first hard resin is injected into the secondary mold to mold the secondary molded article 12, wherein the covering 5 has the space portion 8, the spacer portion 82, the regulating portion 83, and the like, and the second hardening resin is made of an amorphous resin such as acrylonitrile butadiene styrene resin (ABS), polycarbonate (PC), or acrylic resin (PMMA), or a crystalline resin such as polyacetal resin (POM), polyamide resin (PA), polybutylene terephthalate (PBT), or polyacrylic resin (PP). Thus, a toothbrush in which the core 4 of the primary molded article 11 made of the first hard resin is covered with the covering 5 made of the second hard resin can be molded (the primary molded article means a molded article obtained by molding the core main body 6 by the first molding, and the secondary molded article means a molded article obtained by covering the covering 5 by the second molding).

As shown in fig. 1, a fixing convex portion 62 formed of a pin-shaped body and a fixing convex portion 64 formed of a plurality of plate-shaped bodies are provided on the core body 6 of the primary molded article 11, and concave portions 51 and 52 into which the convex portions 62 and 64 are fitted when the core 4 is coated with the secondary molded article 12 formed of the coating material 5 are formed in the coating material 5, respectively. In this embodiment, the peripheral surface of the truncated cone-shaped portion 65 provided at the rear end portion of the core body 6 is covered with the covering 5 in a state where the rear end surface of the truncated cone-shaped portion 65 is exposed to the outside of the covering 5.

Further, by providing a detachable mold (a split mold) for forming the space portion 8 at the front end side portion of the covering material 5 in the secondary mold and making the side wall surface of the detachable mold have a tapered shape, the side wall surfaces 81, 81 of the space portion 8 are formed as tapered surfaces expanding outward. Further, by providing a detachable mold member for forming the drain hole 84 in the vicinity of the tip end portion of the cover 5 in the secondary mold, a toothbrush having the drain hole 84 can be formed.

As the second hardening resin constituting the covering 5, a transparent material may be used. The term "transparent" means capable of permitting the transmission of visible light. Even a resin containing a small amount of a substance that does not transmit visible light (for example, a metal wire or a pigment) is transparent as long as visible light can be transmitted. As the transparent synthetic resin, a resin having a value of 80% or more as measured by a test method of JIS K7105 is particularly preferably used. As described above, if the covering material 5 is made of the second curable resin made of a transparent material, the pattern including the uneven surface 61 and the like formed by the aggregate of the triangles provided on the outer peripheral surface of the core material 4 can be visually recognized through the covering material 5, and the design of the toothbrush can be improved.

As described above, a toothbrush including a head 1 implanted with tufts 10, a neck 2 connected to the head 1, and a handle 3 serving as a grip, the handle 3 being composed of a core 4 and a covering 5, the core 4 being composed of a first hard resin and formed integrally with the neck 2, and the covering 5 being composed of a second hard resin having a property of low adhesion to the first hard resin (i.e., low adhesion between the first hard resin and the second hard resin) can be easily and inexpensively manufactured by two-color molding (i.e., two-color molding). Further, since the core member main body 6 and the movable portion 7 located on the distal end side thereof are provided in the core member 4 of the primary molded article 11 located in the handle 3, and the space portion 8 that allows the swinging displacement of the movable portion 7 is provided in the distal end side portion of the covering member 5 formed of the secondary molded article 12, there is an advantage that excellent operability is obtained without impairing the grasping property of the toothbrush.

That is, since the core member 4 of the primary molded article 11 and the covering member 5 of the secondary molded article 12 constituting the handle 3 of the toothbrush are formed of hard resins having low adhesion properties to each other, the core member 4 and the covering member 5 can be prevented from being welded to each other even though the toothbrush in which the primary molded article 11 and the secondary molded article 12 are combined is formed by two-color molding. As a result, when the user brushes his/her teeth, the movable portion 7 made of the first cured resin provided on the distal end portion side of the core main body 6 is allowed to oscillate and displace within the space portion 8 of the covering 5 without deforming the covering 5 made of the second hard resin.

Therefore, the user of the toothbrush can brush his or her teeth by bringing the tufts 10 of the head 1 into contact with the teeth while stably gripping the covering member 5 located on the outer peripheral portion of the handle 3, and can cause the movable portion 7 of the core member 4 to be displaced in a swinging manner in the direction indicated by the arrow B in fig. 6 in accordance with the brush pressure. Therefore, the head 1 and the neck 2 of the toothbrush are deformed to prevent an excessive brush pressure from being applied and appropriately brush the teeth without causing a problem such as deterioration in the gripping performance of the toothbrush due to deformation of the grip portion as in the conventional art in which the grip portion of the toothbrush is coated with a soft synthetic resin. Further, unlike patent document 1, it is possible to manufacture a toothbrush at low cost by selecting two types of hard resins which are less expensive than elastomers, instead of using a soft resin composed of an expensive (expensive) elastomer or the like.

Instead of forming the toothbrush composed of the primary molded article 11 and the secondary molded article 12 by two-color molding, a molded article in which the head 1, the neck 2, and the core 4 of the toothbrush are integrally connected to each other by a first cured resin and a molded article in which the covering 5 is formed by a second cured resin may be formed by injection molding or the like and then integrally coupled to each other. However, in this case, since it is inevitable that the manufacturing process becomes complicated and the manufacturing cost becomes high, it is preferable to manufacture the toothbrush in which the core member 4 and the covering member 5 are integrally formed at low cost by the above-described two-color molding method.

In the above-described exemplary embodiment, since the convex portions 62 and 64 for fastening are provided in the core body 6 and the concave portions 51 and 52 into which the convex portions 62 and 64 are fitted are provided in the covering 5, the core body 6 and the covering 5 constituting the shank 3 can be stably maintained in an integrated state. That is, as described above, in the case where the core 4 of the primary molded article 11 and the covering 5 of the secondary molded article 12 are formed of hard resin having a property of being less closely attached to each other, the core 4 and the covering 5 cannot be firmly integrated, and therefore, if the covering 5 is forcibly pulled toward the rear end portion side or an operation of rotating the covering 5 is performed, the core 4 and the covering 5 may be separated. However, if the convex portions 62 and 64 provided in the core body 6 are fitted into the concave portions 51 and 52 provided in the covering 5 as described above, there are advantages as follows: the covering member 5 can be effectively prevented from being pulled out from the core member 4 by a simple structure, and the coupled state of the both can be stably maintained.

Further, instead of the representative embodiment in which the fixing protrusions 62 and 64 are provided on the abdominal side of the core body 6, that is, on the implantation surface side of the bundle 10, a representative embodiment may be employed in which the fixing protrusions are provided on the back side of the core body 6 located on the opposite side to the implantation surface side of the bundle 10, and the recesses into which the protrusions are fitted are provided on the back side of the covering 5. Alternatively, a convex portion for fastening may be provided in the covering 5, and a concave portion into which the convex portion is fitted may be provided in the core body 6.

As shown in fig. 1, when the truncated cone-shaped portion 65 is provided at the rear end portion of the core body 6 and the peripheral surface of the truncated cone-shaped portion 65 is covered with the covering material 5, the truncated cone-shaped portion 65 can function as a slip-off prevention portion of the covering material 5, and therefore, separation between the core 4 and the covering material 5 can be more effectively prevented. Further, if the concave-convex surface corresponding to the concave-convex surface 61 formed by the triangular aggregate provided on the outer peripheral surface of the core main body 6 is provided on the inner peripheral surface of the covering 5, the core 4 and the covering 5 can be more firmly coupled.

As shown in the above-described representative embodiment, if the first movable portion 73 and the second movable portion 74 are provided at intervals in the width direction of the handle 3 in the movable portion 7 provided on the distal end portion side of the core body 6, the first movable portion 73 and the second movable portion 74 can be displaced by swinging with a slight force as compared with a configuration in which the entire movable portion is formed by a single plate-like body or the like, and therefore, flexibility of the toothbrush can be improved. Further, the stiffness of the toothbrush may be adjusted by increasing or decreasing the plate thickness of the first movable portion 73 and the second movable portion 74.

Further, by providing the spacer 82 disposed between the first movable part 73 and the second movable part 74 at the distal end side portion of the covering member 5 as described above, the fingers of the user can be prevented from entering the space 8 by the spacer 82 when the user grips the distal end side portion of the covering member 5 to brush the teeth. Therefore, the following advantages are provided: the toothbrush can be operated in a state where the distal end side portion of the covering member 5 is stably held, and appropriate tooth brushing can be performed.

In the exemplary embodiment, a drain hole 84 for discharging moisture in space 8 to the outside, specifically, extending in the direction of protrusion a of the tuft, is provided near the distal end of covering 5. According to this configuration, when the toothbrush is stored in a state in which the space 8 is directed upward after use, moisture accumulated in the space 8 can be quickly discharged to the outside, and therefore, there is an advantage that stickiness of the toothbrush can be prevented and the cleaning performance can be ensured.

Further, as shown in fig. 6, if the stopper 83 for restricting the swing displacement of the movable portion 7 is provided at the distal end portion of the cover 5, the movable portion 7 can be restricted from being largely exposed from the cover 5 when the toothbrush is used, and the movable portion 7 and the neck portion 2 of the toothbrush can be effectively prevented from coming into contact with the hand of the user or the like. Further, since the behavior of the movable portion 7 changes significantly at the time when the movable portion 7 abuts against the restricting portion 83, the user can clearly recognize this state and prevent an excessive brushing pressure from being applied during brushing.

As shown in fig. 5, when the side wall surfaces 81 and 81 of the space portion 8 are formed as tapered surfaces expanding outward, the movable portion 7 can be smoothly swung and displaced along the side wall surfaces 81 and 81 of the space portion 8 in accordance with the brush pressure acting in the direction orthogonal to the bristle implanting surface of the head portion 1 of the toothbrush. Therefore, the following advantages are provided: during brushing, it is possible to reliably prevent the movable section 7 from rubbing against the side wall surfaces 81, 81 of the space section 8 to generate uncomfortable abnormal noise or to prevent smooth swinging displacement of the movable section 7.

In the exemplary embodiment, the arc-shaped curved portion 75 that becomes the oscillation starting point of the movable portion 7 is provided on the rear end portion side of the movable portion 7, specifically, in the vicinity of the rear end portions of the first movable portion 73 and the second movable portion 74 that are each formed of a square rod-shaped body. According to such a configuration, when the toothbrush is used, the bending portion 75 is deformed to be opened according to the brush pressure applied to the head portion 1 (see fig. 6), whereby the distal end portion of the movable portion 7 can be smoothly (smoothly) swung and displaced in the direction B opposite to the protruding direction a of the bristle bundle 10.

Instead of the exemplary embodiment in which the bent portion 75 is recessed in the direction B opposite to the protruding direction a of the tufts, as shown in fig. 6, the bent portion may be recessed in the protruding direction a of the tufts. However, in the case of such a structure, the plate thickness of the covering 5 covering the bent portion becomes extremely small, and the rigidity of the covering 5 may be lowered. Therefore, as shown in the exemplary embodiment, it is preferable to sufficiently secure the rigidity of the covering member 5 by recessing the bent portion 75 in the direction B opposite to the protruding direction a of the tuft.

Fig. 7 to 9 show a toothbrush according to another embodiment of the present invention. In the present embodiment, the movable portion 7a connected to the rear end portion of the neck portion 2a is formed entirely of one cylindrical body, and a space portion 8a corresponding to the movable portion 7a is formed in the covering 5a. In the case where the entire movable portion 7a is formed of a single cylindrical body, there is an advantage that the structure of the shank 3a can be simplified and the cleaning operation thereof can be easily performed, as compared with the above-described exemplary embodiment having the first movable portion 73 and the second movable portion 74 and the spacing portion 82 disposed therebetween as shown in fig. 5.

In contrast, in the present embodiment, since the spacer 82 (see fig. 5) cannot be provided in the space 8a of the cover 5a as in the above-described representative embodiment, the fingers of the user may enter the space 8a to deteriorate the grippability of the toothbrush by the Palm grip method (Palm grip method) of gripping the entire handle 3 a. Therefore, for example, as shown in fig. 10, it is preferable that the outer shape of the handle 3b is formed into a substantially hexagonal shape or the like, and the handle 3b of the toothbrush is formed into a shape that can be easily gripped by a pen-holding method in which the handle 3b is gripped so that the thumb, the index finger, and the middle finger grip the pencil.

Specifically, the outer shape of the shank 3b is formed into a substantially hexagonal shape having: a back portion 31 located on the opposite side of the flocked surface (the side of direction B opposite to the protruding direction of the hair bundle); back side surfaces 32, 33 formed by inclined surfaces provided on the left and right sides thereof; an abdomen portion 34 located on the side of the implanted hair surface (the side of the protrusion direction a of the hair bundle); and abdomen side surfaces 35 and 36 formed by inclined surfaces provided on the left and right sides thereof. By forming the grip portion 3b in this manner, the grip portion 3b gripped by the user can be prevented from rotating, and the gripping state of the grip portion 3a can be stabilized.

When the handle portion 3b of the toothbrush is gripped by the pen-holding method (see fig. 11), as shown in fig. 10, the thumb O of the user is placed on the abdomen 34 on the bristle-implanted surface side, and the index finger H and the middle finger N are placed on the back side surfaces 32 and 33 on the opposite sides of the bristle-implanted surface, respectively, so that the fingers of the user are not placed on the back 31 on the opposite side of the bristle-implanted surface. Therefore, the user's fingers do not enter the space 8a (see fig. 9) provided on the back side of the cover 5a, and the gripping performance of the toothbrush can be prevented from deteriorating.

As shown in fig. 8, a gap 85a having a predetermined width is provided between the rear end surface of the neck portion 2a and the front end surface of the covering 5a. This makes it easy to pull out the fingers even if the fingers enter the gap 85a, and prevents the fingers of the user from being subjected to an excessive pinching force. Further, an arc-shaped curved portion serving as a swing start point of the movable portion 7a may be provided on the rear end portion side of the movable portion 7a formed of a single flat plate-like body or the like.

As shown in fig. 9, a gap 86a having a predetermined width is provided between the side wall surface 81a of the space portion 8a and the side end surface of the movable portion 7 a. This makes it easy to pull out the fingers even if the fingers enter the gap 86a, and prevents the fingers of the user from being subjected to an excessive pinching force. Moreover, the method has the following advantages: when the movable portion 7a is displaced by swinging, the side end surface thereof can be reliably prevented from coming into contact with the side wall surface 81a of the space portion 8a, and the movable portion 7a can be displaced by swinging smoothly.

However, when the gap 86a having a predetermined width is provided between the side wall surface 81a of the space portion 8a and the side end surface of the movable portion 7a as described above, the opening area of the space portion 8a located on the upper side in fig. 9 increases, and fingers and the like easily enter the space portion 8a, so that the grip of the grip portion 3a tends to decrease. Therefore, it is preferable to provide a coating portion or the like that covers the upper surface of the space portion 8a and is not shown in the drawings, thereby improving the grippability of the shank 3 a. In the case where the covering portion covering the opening surface of space portion 8a is provided as described above, it is further preferable that the covering portion is provided with a drain hole for discharging the moisture in space portion 8a to the outside, that is, a discharge port for discharging the moisture in space portion 8a in a direction B opposite to the direction a in which the tufts protrude.

In the present embodiment, an example in which the movable portion 7a is formed of a columnar body having a narrow tip is provided as shown in fig. 8 has been described, but instead of this configuration, a movable portion 7b formed of a columnar body having the same cross-sectional shape and extending straight may be provided as shown in fig. 12. Instead of the movable portions 7a and 7b of the cylindrical body, a movable portion 7c having an arc-shaped cross section or a movable portion (not shown) having a flat plate-shaped cross section may be provided as shown in fig. 13.

Fig. 14 to 17 show a toothbrush according to still another embodiment of the present invention. In the present embodiment, the handle 3 of the toothbrush has: a core member 4 formed of a first hard resin integrally with the neck portion 2; and a covering member 5 made of a second hard resin having a low adhesion property to the first hard resin, wherein the core member 4 includes: a core body 6 embedded in the covering 5; and a movable portion 7d provided on the distal end portion side of the core body 6 and capable of oscillating displacement in a direction B opposite to the projecting direction a of the hair bundle when subjected to a brush pressure acting in a direction orthogonal to the hair-planted surface of the head portion 1. On the other hand, as shown in fig. 15 and 16, the movable portion 7d in a cross section perpendicular to the longitudinal direction of the toothbrush is formed in a longitudinal shape in which a dimension (a) in the longitudinal direction, which is a direction perpendicular to the bristle-implanted surface of the head 1, is larger than a dimension (b) in the lateral direction, which is perpendicular to the direction.

The space 8d provided in the distal end portion of the covering 5 is formed so as to penetrate from the abdominal side surface to the dorsal side surface thereof. The width dimension of the space portion 8d, that is, the interval between the left and right side wall surfaces 81d, 81d of the space portion 8d is set to a value corresponding to the lateral dimension (b) of the movable portion 7d, for example, substantially the same as or slightly larger than the lateral dimension (b) (an interval not exceeding about 2 times the lateral dimension (b)), thereby allowing the movable portion 7d to be displaced by swinging within the space portion 8 d. As shown in fig. 17, a bridging portion 88d that connects the abdomen-side portions of the side wall surfaces 81d, 81d to each other is provided at the distal end portion of the cover 5, and the movable portion 7d is blocked by the bridging portion 88d so as not to be displaced from a straight state on the axis of the toothbrush toward the projecting direction a of the bristle bundle 10.

In this way, when the cross-sectional shape of the movable portion 7d is formed to be vertically long, the rigidity of the movable portion 7d in the vertical direction of fig. 15, that is, the brush pressure acting direction can be sufficiently ensured while the lateral dimension (b) thereof is kept small. That is, by suppressing the lateral dimension (b) of the movable portion 7d while sufficiently securing rigidity, it is possible to suppress the width dimension of the space portion 8d corresponding thereto from becoming excessively large, and to maintain good gripping performance.

As shown in fig. 17, a gap 85d having a predetermined width is provided between the rear end surface of the neck portion 2d and the front end surface of the cover 5d. This makes it easy to pull out the fingers even if the fingers enter the gap 85d, and prevents the fingers of the user from being subjected to an excessive pinching force. As shown in fig. 15, a gap 85d having a predetermined width is provided between the side wall surface 81d of the space portion 8d and the side end surface of the movable portion 7 d. This makes it easy to pull out the fingers or the like even if the fingers or the like enter the gap 86d, and prevents the fingers or the like of the user from receiving an excessive pinching force. If the gap 86d is provided between the side wall surface 81d of the space portion 8d and the side end surface of the movable portion 7d, the following advantages are obtained: when the movable portion 7d is displaced in a swinging manner, the side end surface thereof can be reliably prevented from coming into contact with the side wall surface 81d of the space portion 8d, and the movable portion 7d can be displaced in a swinging manner smoothly.

As shown in fig. 17, a space 8d provided in the distal end portion of the covering 5 is formed to penetrate from the upper surface to the lower surface of the covering 5. The space 8d functions as a drain hole for discharging moisture to the outside. Since the bridge portion 88d that connects the upper surface sides of the side wall surfaces 81d, 81d to each other is provided at the distal end portion of the covering 5, the rocking displacement of the movable portion 7d to the side of the projecting direction a of the hair bundle 10 can be reliably restricted, and the rocking displacement of the movable portion 7d in the lateral direction can be effectively suppressed.

Here, the cross-sectional shape of the movable portion 7d need not be uniform in the longitudinal direction, and may be configured to have a long shape in a part thereof. For example, the distal end side of the movable portion 7d may be formed in a vertically long elliptical shape, and the proximal end side of the movable portion 7d may be formed in a perfect circular shape, or may be gradually changed in cross-sectional shape. Further, the shape is not limited to the oval shape, and may be an oblong shape having a longitudinal dimension (a) larger than a transverse dimension (b) as shown in fig. 19, or a rectangular shape having a longitudinal dimension (a) larger than a transverse dimension (b) as shown in fig. 20. In fig. 20, the corner portion 70 is provided with an R-shaped chamfer in consideration of the formability of the movable portion 7d, but the R-shaped chamfer may be omitted.

Examples

Next, regarding various examples (examples 1 to 13 and comparative examples 1 to 5) in which the longitudinal and lateral dimensions of the cross-sectional shape (fig. 16) of the movable portion are changed in the examples of the embodiment in which the movable portion is vertically long shown in fig. 14 to 17, FEM analysis is performed on the bending stress of the movable portion when the rear portion of the movable portion is fixed and a load P is applied to the head portion 1, and the results thereof will be described.

As shown in fig. 18, in a state where the rear portion of the movable portion 7 is held by the fixture Q and is fixed so as to be immovable in a portion on the rear side of the movable portion 7, a load P is applied to the entire flocked surface of the head portion 1, and FEM analysis is performed on the maximum bending stress σ max among the bending stresses generated in the elements of the movable portion 7 divided into a plurality of meshes, and as a result, the analysis data shown in table 1 is obtained. In the FEM analysis, "Solidworks syndromes" manufactured by daxosystem corporation (124801248377125125711247312486125212412474.

The analysis conditions were as follows.

Load: the entire hair-planting stage was pressed at 1N.

Material of the movable portion: PBT (polybutylene terephthalate).

Length l of movable part (fig. 18): 10mm/15mm/20mm/25mm.

Distance L (fig. 18) between the pressed position (center position of the hair-planting stage) and the fixed position: 71.9mm in the case of a movable portion length of 10mm, 76.9mm in the case of a movable portion length of 15mm, 81.9mm in the case of a movable portion length of 20mm, and 86.9mm in the case of a movable portion length of 25mm.

TABLE 1

When used as a toothbrush, the maximum stress value σ max of the movable part 7, which is neither too soft nor too hard, is approximately 0.8 × 10 ⁷ N/m ² ～2.0×10 ⁷ N/m ² . When the transverse dimension (b) is 3mm, if the longitudinal dimension is also 3mm, the maximum stress value σ max is larger than 2.0 × 10 as shown in comparative examples 1 to 3 ⁷ N/m2, which is a toothbrush with an excessively soft movable part 7. However, even if the transverse dimension (b) is 3mm, if the longitudinal dimension (a) is 4mm or more, the maximum stress value σ max is 2.0 × 10 as shown in examples 1 to 3 ⁷ N/m ² The movable portion 7 having a desired hardness can be obtained as follows. From this, it is preferable that the aspect ratio a/b is 1.3 or more.

However, even if the transverse dimension (b) is also 3mm, if the longitudinal dimension (a) is 6mm, the maximum stress value σ max is 0.882 × 10 as in example 12 ⁷ N/m ² And becomes rather hard, approaching the limit. Therefore, it is found that the aspect ratio a/b is preferably 2.0 or less. In addition, if the transverse rulerWhen inch (b) is 4.5mm, the maximum stress value σ max is 0.811 × 10 even if the longitudinal dimension (a) is 5mm as in example 13 ⁷ N/m ² And is a hard limit. Therefore, it is found that the transverse dimension (b) is preferably 4.5mm or less. On the other hand, if the transverse dimension (b) is 5mm, it can be seen from comparative example 5 that the maximum stress value σ max is less than 0.8 × 10 even if the longitudinal dimension (a) is 5mm in the same manner ⁷ N/m ² And becomes too hard.

If the transverse dimension (b) is 2.5mm, the maximum stress value σ max is 1.48 × 10 as in example 4 in the case where the longitudinal dimension (a) is 5mm as in example 4 and example 10 ⁷ N/m ² When the longitudinal dimension (a) is 6.5mm, the maximum stress value σ max is 0.997 × 10 as in example 10 ⁷ N/m ² If the longitudinal dimension (a) is not made considerably large, a moderate hardness cannot be obtained. Therefore, it is preferable that the transverse dimension (b) is 2.5mm or more.

Claims (8)

1. A toothbrush, characterized by:

comprises a head part implanted with hair bundles, a neck part connected with the head part and a handle part serving as a handle,

the handle has: a core member made of a first hard resin formed integrally with the neck portion; and a covering member formed of a second hard resin having a low adhesion property with the first hard resin so as to cover the core member,

the core member has: a core member main body embedded in the covering member; and a movable part provided on the distal end side of the core member main body, the movable part being capable of oscillating displacement in a direction opposite to the protruding direction of the hair bundle when subjected to a brush pressure acting in a direction orthogonal to the hair-planted surface of the head,

a space portion that allows the swing displacement of the movable portion is provided at a distal end side portion of the covering member.

2. The toothbrush of claim 1, wherein:

the movable portion has a longitudinal shape portion at least partially, and a dimension in a longitudinal direction of the longitudinal shape portion is larger than a dimension in a lateral direction orthogonal to the longitudinal direction in a cross section of the longitudinal shape portion, wherein the longitudinal direction is a direction orthogonal to the hair-planted surface of the head portion.

3. The toothbrush of claim 2, wherein:

the ratio of the longitudinal dimension to the lateral dimension of the movable portion is 2.2 or less in terms of the longitudinal dimension/the lateral dimension.

4. The toothbrush of claim 1, wherein:

the movable portion is formed of a single rod-shaped body, and the movable portion has a lateral dimension of 2.5mm to 4.5 mm.

5. The toothbrush according to any one of claims 1 to 4, wherein:

a drain hole for discharging moisture in the space portion to the outside of the covering member is provided in the vicinity of the distal end portion of the covering member.

6. The toothbrush according to any one of claims 1 to 4, wherein:

a restricting portion for restricting the swing displacement of the movable portion is provided on a distal end surface of the covering member.

7. The toothbrush according to any one of claims 1 to 4, wherein:

and a gap for preventing fingers from being clamped is arranged between the rear end face of the neck part and the front end face of the cladding part.

8. The toothbrush according to any one of claims 1 to 4, wherein:

a gap for preventing fingers from being pinched is provided between a side wall surface of the space portion and a side end surface of the movable portion.

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