KR101971310B1

KR101971310B1 - Toothbrush

Info

Publication number: KR101971310B1
Application number: KR1020147012644A
Authority: KR
Inventors: 히로코 마츠오
Original assignee: 라이온 가부시키가이샤
Priority date: 2011-12-07
Filing date: 2012-12-06
Publication date: 2019-04-22
Also published as: CN103957744B; TWI520696B; TW201328632A; JP2013118944A; CN103957744A; KR20140107191A; JP5806922B2; WO2013085006A1

Abstract

INDUSTRIAL APPLICABILITY According to the present invention, a toothbrush having a high cleaning effect is provided even if the neck portion is made thinner. The neck portion includes a neck portion, a neck portion, and a neck portion. The neck portion extends from the head portion toward the handle portion, The toothbrush according to claim 1, wherein the neck portion has a substantially circular cross-sectional contour on the side of the head portion, and a substantially quadrangular-shaped cross- The present invention relates to a toothbrush having a substantially rectangular polygonal shape in a thickness direction and having a corner on both sides as the outline cross-section of the substantially tetragonal shape is directed toward the handle portion side.

Description

Toothbrush {TOOTHBRUSH}

The present invention relates to a toothbrush.

The present application claims priority based on Japanese Patent Application No. 2011-267939, filed on Dec. 7, 2011, the contents of which are incorporated herein by reference.

A general toothbrush includes a handle body having a head portion with a hairline, a handle portion to be gripped at the time of use, and a neck portion to connect the head portion and the handle portion, and a knife portion having a hair- will be.

BACKGROUND ART [0002] In a toothbrush as a cleaning appliance in the oral cavity, a plurality of inventions have been made to enhance the cleaning effect, which is the most necessary function. In order to enhance the cleaning effect, it is important that the flocking portion is brought into contact with the portion to be cleaned, and the portion to be cleaned is rubbed with an appropriate brushing pressure. The plaque attached to the tooth surface, the occlusal surface of the molar, the moving tooth, and the cervical portion can not be sufficiently removed unless the flocking portion properly contacts the cleaning target portion. If the brushing pressure is too small when cleaning the inside of the mouth, it is difficult to drop the plaque, especially the plaque of the narrow portion such as the interdental portion or the cervical portion, and if the brushing pressure is too large, there is a risk of damaging the gums and the teeth.

It is common in toothbrushes to devise such arrangements as hair arrangement, shape of appearance, hair shaping of hair, and so on, so that the hair follicle comes into contact with the area to be cleaned appropriately.

In recent years, as the hygienic orientation has become higher, it is required to further improve the cleaning effect of the toothbrush. In order to meet such a demand, a toothbrush combined with a hair shaft having a different diameter and a hair shaft having a different hair- A toothbrush has been proposed.

In addition, an attempt has been made to improve the cleaning effect by the devising of the handle body.

For example, there has been proposed a brush having a round rectangular shape or an elliptical shape with a small numerical value with respect to the other side in the thickness direction of the bristles across the entire neck (see, for example, Patent Document 1 ). According to the invention of Patent Document 1, the neck portion is thinned so as to be bent lighter and lighter, thereby alleviating the brushing pressure.

Alternatively, a toothbrush has been proposed in which the contour of the thickest portion of the grasping portion that is touched by the thumb is a hexagonal shape of a specific shape (for example, Patent Document 2). According to the invention of Patent Document 2, by changing the face touching the hexagonal shape of the thumb of the holding hand, the angle formed by the boundary line between the teeth and the gums and the bit line of the toothbrush is determined, Cleaning is planned.

Japanese Patent Application Laid-Open No. 2011-36628 Japanese Patent Publication No. 1-41306

However, it is effective to thin the neck portion and improve the operability in the oral cavity in order to properly dope the flocked portion with respect to all the cleaning target portions such as the tooth surface of the molar, the occlusal surface, the tooth portion, and the cervical portion.

However, if the neck portion is made thinner and the operability of the toothbrush in the oral cavity is increased, the strength of the handle body is insufficient, and the amount of deflection of the neck portion becomes too large, and the cleaning effect tends to be deteriorated. It is possible to prevent the handle body from being bent or broken by molding a handle body using a resin having a high strength (a bending elastic modulus of 2000 MPa or more). However, since the bent amount of the neck portion can not be completely controlled, There is a problem that it is not possible to chase.

It is therefore an object of the present invention to provide a toothbrush having a high cleaning effect even when the neck portion is made thinner.

As a result of intensive studies, the inventors of the present invention have found that, by changing the cross-sectional contour of the neck portion to a specific shape from the head portion side toward the handle portion side and regulating the direction in which the neck portions are bent, It is possible to improve the cleaning effect by cleaning with an appropriate brushing pressure, and have reached the present invention.

In other words, one aspect of the toothbrush of the present invention is a toothbrush comprising: a head portion having a hair-tight groove; a neck portion extending from the head portion; and a handle portion extending from the neck portion, Wherein the neck portion has a substantially circular cross-sectional contour near the head portion, and as the outline contour of the substantially circular portion faces the handle portion, the cross- (Top) is located on both sides of the substantially quadrangular cross-sectional contour of the above-mentioned rectangular cross-section toward the handle portion, and is formed into a rough polygon that is flat in the thickness direction .

It is preferable that any one side of the rough polygon flat in the thickness direction is formed on the surface of the neck portion and a side opposite to the arbitrary one side is formed on the back side of the neck portion, To the handle portion.

That is, the present invention relates to the following.

(1) A headlight device comprising: a head portion that is hollow; a neck portion that is provided in the head portion; and a handle portion that is provided in the neck portion, wherein the neck portion has a cross-sectional outline that changes from the head portion side toward the handle portion side In a toothbrush,

Wherein the neck portion has a generally rectangular cross sectional profile on the side of the head portion and a substantially rectangular cross sectional profile formed on the front side, the back side and the side face as the outline contour of the substantially circular portion faces the handle portion side, And a substantially quadrilateral cross-sectional outline of the toothbrush is located on both sides of the handle so as to form a substantially polygonal shape flat in the thickness direction.

(2) The polygonal shape flattened in the thickness direction described above is characterized in that any one side is formed on the surface of the neck portion, and the opposite side to the arbitrary side is formed on the back side of the neck portion. &Lt; / RTI >

(3) The toothbrush according to (1) or (2), wherein the neck portion is enlarged from the head portion side toward the handle portion side.

According to one aspect of the toothbrush of the present invention, the neck portion has a generally circular cross-sectional contour on the side of the head portion, and the cross-sectional contour of the substantially circular cross- Sectional shape and the outline contour of the substantially quadrangular shape as described above is directed toward the handle portion side, the corner portion is located on both sides and is formed into a roughly polygonal shape flat in the thickness direction. Therefore, even if the neck portion is made thinner, .

According to an aspect of the toothbrush of the present invention, the above-mentioned roughly polygonal shape flat in the thickness direction is formed by a certain one side on the surface of the neck portion, and the side opposite to any one side is formed on the back surface of the neck portion , It is possible to further reduce the brushing pressure.

According to one aspect of the toothbrush of the present invention, since the neck portion is enlarged from the side of the head portion toward the side of the handle portion, the neck portion is bent more lighter and lighter and the brushing pressure can be made more appropriate.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a plan view of a toothbrush according to an embodiment of the present invention. FIG.
1B is a side view of a toothbrush according to an embodiment of the present invention;
Figure 2a is a sectional view taken along the line AA of Figure 1B.
FIG. 2B is a cross-sectional view taken along line BB in FIG. 1B. FIG.
2C is a CC sectional view of FIG.

A toothbrush according to an embodiment of the present invention will be described below with reference to Figs. 1 and 2. Fig.

The toothbrush 1 of Figs. 1A and 1B includes a head portion 2 having a substantially rectangular shape in plan view (in plan view), a neck portion 4 provided on the head portion 2, (Not shown) provided on the head portion 2. The handle portion 10 has a generally elongated shape and is formed integrally with the handle portion 6,

The material of the handle 10 may be determined in consideration of the rigidity and mechanical characteristics required of the handle 10 and may be determined by using a resin having a flexural modulus (JIS K7203) of 500 MPa or more ), And a resin having a flexural modulus of 2,000 MPa or more is more preferable. The upper limit of the flexural modulus of the resin used for the handle 10 is not particularly limited, but is, for example, 3000 MPa. Examples of the resin having a flexural modulus of 500 MPa or more include polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycyclohexylenedimethylene terephthalate (PCT) (PS), acrylonitrile-butadiene-styrene resin (ABS), cellulose propionate (CP), polyarylate, polycarbonate, acrylonitrile-styrene copolymer resin Among them, POM, PEN, PBT and the like having a bending elastic modulus of 2,000 MPa or more are preferable. By using a resin having a bending elastic modulus of 2,000 MPa or more, the head portion 2 can be made thinner and the neck portion 4 can be made thinner to improve operability in the oral cavity and to prevent breakage of the handle body 10 have.

The handle body 10 may be partially or entirely covered with a soft resin. A part or the whole of the handle portion 6 is covered with the soft resin so that the fit feeling of the hand when the user grasps the handle portion 6 is improved and the gripped finger can be prevented from slipping.

As the flexible resin, for example, a resin of Shore A90 or less, and more preferably a resin of Shore A10 to 40 can be mentioned. Examples of such a soft resin include an elastomer resin such as a polyolefin elastomer, a styrene elastomer, a polyester elastomer and a polyurethane thermoplastic elastomer, and silicone.

The length L1 of the handle 10 can be determined in relation to operability and the like, and is, for example, 150 to 200 mm.

The head portion 2 has a substantially rectangular shape in which the longitudinal direction of the handle 10 is long and a corner on the side of the neck portion 4 in a plan view is curved and a corner is cut, And a plurality of hair-removal holes 22 are formed on one surface (hair-removal surface) 20. In this hair-removal hole (22), hair is bundled with hair, and a hair-removal portion made up of a plurality of hair bundles is formed.

In the present specification, the direction parallel to the cooking cavity 20 and perpendicular to the longitudinal direction of the handle 10 is defined as the width, and the direction orthogonal to the cooking cavity 20 is referred to as the thickness. In addition, the side facing the cooking cavity surface 20 is referred to as the surface, and the side opposite to the side facing the cooking cavity surface 20 is referred to as the back side.

The size of the head part 2 can be determined in consideration of operability in the oral cavity and the like.

If the width W1 of the head portion 2 is too large, the operability in the oral cavity is deteriorated. If the width W1 is too small, the number of bristles implanted is too small and the cleaning effect tends to be impaired. Therefore, the width W1 is, for example, 5 to 13 mm.

The thinner the thickness T1 of the head portion 2, the easier the operability in the oral cavity can be. However, if the thickness T1 is too thin, the strength of the head portion 2 tends to be insufficient. Therefore, the thickness T1 can be determined in consideration of the material of the handle 10, and is preferably, for example, 1.5 to 5 mm, more preferably 2 to 3 mm.

If the length L3 of the head part 2 is too long, the operability in the oral cavity tends to be impaired. If the length L3 is too short, the number of hair pieces implanted is too small and the cleaning effect tends to be impaired. Therefore, the length L3 is suitably determined in the range of 10 to 26 mm.

The shape of the casting hole 22 is not particularly limited, and examples thereof include a round shape such as a circle or an ellipse, and a polygon such as a triangle or a tetragon.

The number of the hair-removing holes 22 is not particularly limited, and is, for example, 10 to 60. [

The diameter of the hair-removing bore 22 is determined depending on the thickness of the required hair, and is, for example, 1 to 3 mm.

The arrangement pattern of the hair-removal holes 22 is not particularly limited, and any arrangement pattern such as so-called checkerboard pattern or zigzag pattern may be used.

Examples of the appearance that constitutes the mother line include a figure (tapered mother) whose diameter gradually decreases toward the bus bar, and a figure (straight mother) whose outer diameter is substantially the same except for the rounded portion of the mother line.

As the material of the appearance, for example, polyamide such as 6-12 nylon and 6-10 nylon, polyester such as PET, PBT, PTT, PEN, polybutylene naphthalate (PBN) Polyolefin such as polypropylene (PP), olefin elastomer, and styrene elastomer. These resin materials may be used singly, or two or more kinds may be used in combination.

Further, the appearance may be a multi-core structure having a core portion and at least one layer of sheath provided outside the core portion.

The cross-sectional outline of the appearance is not particularly limited, and may be, for example, a polygonal shape such as circular, triangular, tetragonal, pentagonal, hexagonal, And the like.

The thickness of the appearance is not particularly limited, and is 3 to 11 mils (1 mil = 1/1000 inch = 0.025 mm) when the contour of the cross section is circular, for example. The entire body may be composed of the same thickness of the features or two or more kinds of the features of different thickness may be combined.

The length of the appearance is not particularly limited, and is, for example, 6 to 12 mm.

The handle portion 6 is gradually reduced in diameter from the boundary between the neck portion 4 and the handle portion 6 (that is, the neck portion rear end) P2 toward the handle body rear end 7, So as to reach the rear end 7 of the handle body. The cross-sectional contour of the handle portion 6 is substantially similar to the cross-sectional contour of the neck rear end P2 described later.

The neck portion 4 connects the head portion 2 and the handle portion 6 and has a shape that is enlarged as the head portion 2 side faces the handle portion 6 side.

The neck portion 4 has the smallest cross sectional area of the boundary between the head portion 2 and the neck portion 4 (i.e., the neck tip end) P1 and the neck rear end P2 has the largest area . The cross-sectional area at the tip of the neck portion P1 can be determined in consideration of the material of the handle 10, and for example, when the material is a resin having a flexural modulus of 2,000 MPa or more, it is preferably 7 to 12.6 mm2. If the lower limit value is not less than the lower limit value, the strength of the neck portion 4 becomes sufficient, and the operability in the oral cavity can be further increased if the upper limit value is not exceeded.

The cross-sectional area of the rear end portion of the neck portion P2 can be determined in consideration of the material of the handle 10. For example, when the material is a resin having a flexural modulus of 2,000 MPa or more, 60 to 150 mm2 is preferable.

Within the above range, the amount of bowing of the neck portion 4 can be appropriately regulated, and the cleaning target portion can be cleaned with an appropriate brushing pressure.

The tip end P1 of the neck portion P1 is an end point of a curve forming a corner cut-off of the head portion 2 (i.e., a position at which the curved direction of a curve forming a corner cut is changed). Further, (P2) is a position at which the widening of the neck portion 4 ends in a plan view.

As the neck portion 4 faces the handle portion 6 side from the head portion 2 side, the contour of the cross section changes. In this specification, a cross-sectional outline is a contour of a cross-section orthogonal to the longitudinal direction.

As shown in Figs. 1 and 2, in the neck portion 4 of the present embodiment, the cross-sectional outline of the neck portion P1 is substantially circular (including the neck portion P1, (Hereinafter referred to as " circular portion 40 "), the outline contour of this substantially circular shape is directed toward the handle portion 6 side, and a substantially quadrangular cross- And the cross-sectional outline of the substantially quadrangular shape is directed toward the handle portion 6, the cross-sectional outline (including the neck rear end P2) And the portion having a hexagonal shape is referred to as a polygonal portion 44). Ridges 46 and 46 are formed on both side surfaces of the handle body 10 from the polygonal portion 44 to the handle body rear end 7.

The circular portion 40, the square portion 42 and the polygonal portion 44 are continuously formed so that the cross-sectional outline of the neck portion 4 gradually changes. The approximate quadrilateral includes a shape in which a corner has a curved edge and a rough hexagon is a concept that includes a shape in which a corner is cut off by a curved line. The reference character Q in Figs. 2A to 2C is the center line of the cross-sectional outline of the circular portion 40. Fig.

As shown in Fig. 2A, the circular section 40 has an outline contour roughly circular. The roughly circular shape means that the ratio expressed by the thickness t1 / the width w1 is 0.95 to 1.05. The outline circle is defined in the same manner as the outline circle. Since the circular section 40 has an approximately circular shape in cross-section, the direction of bending is hardly regulated, and the direction of the kneading surface 20 varies according to the part to be cleaned, thereby further enhancing the cleaning effect.

The thickness t1 can be determined in consideration of the material of the handle 10. For example, when the material is a resin having a flexural modulus of 2,000 MPa or more, the thickness t1 is preferably 3.0 to 4.0 mm, more preferably 3.0 to 3.5 mm Do. When the lower limit value is not less than the lower limit value, the amount of bowing can be appropriately regulated, and when the upper limit value is less than the upper limit value, operability in the oral cavity can be further improved.

The width w1 is the same as the thickness t1.

As shown in Fig. 2B, the rectangular section 42 has a generally square-shaped outline contour, which is formed on the front, back, and side surfaces of the neck section 4. The approximate square means that the ratio expressed by the thickness t2 / the width w2 is 0.95 to 1.05. Since the quadrilateral portion 42 has a substantially square cross-sectional outline and each side is formed on the front surface, back surface, and side surface of the neck portion 4, the warping direction is perpendicular to the thickness direction of the neck portion 4 or the width direction .

The thickness t2 can be determined in consideration of the material of the handle 10. For example, when the material is a resin having a flexural modulus of 2,000 MPa or more, the thickness t2 is preferably 3.0 to 6.0 mm, more preferably 4.0 to 5.0 mm Do. If the lower limit value is not less than the lower limit value, the direction of warping can be sufficiently regulated, and if the upper limit value is less than the upper limit value, operability in the oral cavity can be further improved.

The width w2 is the same as the thickness t2.

As shown in Fig. 2C, the polygonal portion 44 has a generally hexagonal cross-sectional outline. The outline hexagonal shape is such that the portions 50 and 50 are located on both sides of the neck portion 4 and the portion 50 is connected to form a part of the ridgeline 46. The hexagonal shape is a shape in which the upper side 52 is formed on the surface of the neck portion 4 and the lower side 54 opposite to the upper side 52 is formed on the back surface of the neck portion 4, The thickness t3 is shorter than the thickness t3. That is, the thickness t3 is flat in the thickness direction. Since the polygonal section 44 has such a cross-sectional profile, the polygonal section 44 is difficult to bend in the width direction by the ridgeline 46 formed on the side surface, and is easily bent in the thickness direction because it is flat in the thickness direction. Further, since the polygonal portion 44 has a flat surface and a back surface, it is difficult to restrict the warp in the thickness direction.

The ratio expressed by the thickness t3 / the width w3 can be determined in consideration of the material of the handle 10, and is preferably 0.50 to 0.95, and more preferably 0.70 to 0.90.

The thickness t3 can be determined in consideration of the material of the handle 10. For example, when the material is a resin having a flexural modulus of 2,000 MPa or more, the thickness t3 is preferably 6 to 12 mm, more preferably 8 to 10 mm Do. If the lower limit value is not less than the lower limit value, the direction of warping can be sufficiently regulated, and the neck portion 4 can be bent more lighter and lighter than the upper limit value, thereby making the brushing pressure more suitable.

The width w3 can be determined in consideration of the material of the handle 10. For example, when the material is a resin having a flexural modulus of 2,000 MPa or more, the width w3 is preferably 8 to 20 mm, more preferably 10 to 15 mm Do. If the lower limit value is not less than the lower limit value, the warpage in the width direction can be sufficiently regulated, and the operability of the lower limit value can be further improved.

The length of the neck portion 4 can be determined in consideration of the length L3 of the head portion and the length L2 from the tip end 9 of the handle member to the rear end P2 of the neck portion, The length becomes 70 to 100 mm. When the length L2 is equal to or larger than the lower limit value, operability in the oral cavity can be further improved, and the amount of bowing of the neck portion 4 below the upper limit value can be appropriately regulated.

The length L4 from the tip end 9 of the handle body to the tip end (ridge tip) 47 of the ridge line 46 is preferably 60 mm or more and more preferably 65 mm or more. The upper limit of the length L4 is, for example, 90 mm. When the length L4 is equal to or larger than the lower limit value, the ridge line 46 can be prevented from being brought into contact with the oral cavity, thereby preventing discomfort during cleaning. If the length L4 is less than the upper limit value, the amount of bowing of the neck portion 4 can be appropriately regulated.

The toothbrush 1 of the present embodiment is manufactured in accordance with a conventionally known manufacturing method of a toothbrush.

For example, a hard resin is injected into the mold to mold the handle 10. Subsequently, the toothbrush 1 is obtained by setting the hair speed on the kneading surface 20 of the handle body 10 obtained. As a method of setting the hair speed, for example, there are a flat wire type hair-kneading machine in which the mother hair is folded into two pieces and a plain line sandwiched therebetween is put in the hair-kneading hole 22, And an in-mold method in which a molten resin is injected into a mold after forming a molten mass by heating the lower end of the mold to form a cast part.

Next, a method of using the toothbrush 1 of the present embodiment will be described.

First, the handle portion 6 is gripped. The shape of gripping the handle portion 6 is not particularly limited, and may be a palm-grip style or a pen-lip style. Normally, in order to clean the target portion while applying pressure, a thumb or the like is held in the vicinity of the rear end portion P2 of the neck portion in any gripping manner to grip the handle portion 6.

Next, the head portion 2 is inserted into the oral cavity, and the knife-in portion is slid to the cleaning target portion while pressing the handle portion 6 with a thumb or the like placed near the polygonal portion 44. [ A force applied to the handle portion 6 is transmitted to the head portion 2 through the neck portion 4 and is transferred from the head portion 2 to the flocking portion so that the flocking portion presses the cleaning target portion And clean it. At this time, since the outline of the circular section 40 has an approximately circular shape, the direction of warping is not regulated. Therefore, the circular portion 40 warps depending on the shape of the portion to be cleaned, so that the flocking portion makes contact with the portion to be cleaned appropriately.

Here, if the direction in which the entire neck portion 4 is bent is not regulated, the force transmitted from the handle portion 6 to the neck portion 4 is lost, or the neck portion 4 is excessively bent, I can not.

In the present embodiment, the polygonal portion 44 is restricted to bend in the width direction and to bend in the thickness direction by the ridgeline 46 formed on both sides and the cross-sectional profile flat in the thickness direction. The force applied to the handle portion 6 is restricted by the force in the thickness direction by the polygonal portion 44 and transmitted to the tetragonal portion 42. [ The outline of the square cross section of the quadrilateral section 42 is approximately square. The sides of the quadrangular section are formed on the front, back and side surfaces of the neck section 4, and the direction of warping is regulated in the thickness direction and the width direction. Therefore, the force transmitted to the tetragonal section 42 is transmitted to the circular section 40 without being excessively lost.

In addition, as the neck portion 4 changes from a neck portion end P1 toward a neck portion rear end P2, the cross-sectional outline changes into an approximately circular shape, an approximate square shape, and a substantially hexagonal shape flattened in the thickness direction, The direction in which the neck portion is gradually bent from the tip end P1 toward the neck portion rear end P2 is regulated. Therefore, even if the neck portion 4 is made thinner, the entire neck portion 4 is not excessively weakened, and the flocking portion comes into contact with the cleaning target portion in an appropriate state, and the force is applied to the head portion 2).

Since the neck portion 4 of the toothbrush 1 of the present embodiment has a shape that tapers from the neck portion rear end P2 toward the neck portion front end P1, Lighter and lighter, thereby relieving the pressure applied to the area to be cleaned more appropriately, thereby making the brushing pressure more suitable.

As described above, according to the toothbrush of the present embodiment, the neck portion has a generally circular cross-sectional outline on the side of the head portion, and a generally circular cross-sectional outline toward the handle portion side, Since the cross section is a quadrangular cross-sectional contour and the outline of the substantially quadrangular cross-section is directed toward the handle portion side, the corner is positioned on both sides and the cross section is flattened in the thickness direction. Therefore, Effect can be exerted.

The present invention is not limited to the above-described embodiment.

In the above-described embodiment, the cross-sectional outline of the circular portion has an approximately straight circular shape, but the present invention is not limited to this, and the cross-sectional outline of the circular portion may be an elliptical shape. The cross-sectional outline of the circular portion can be appropriately set in consideration of the function and the like of the toothbrush. For example, in order to obtain a toothbrush with a softer touch feeling, it is preferable that the cross-sectional contour of the circular portion has a flat shape in the thickness direction. This is because by making the shape flat in the thickness direction, the brushing pressure can be further relaxed.

In the above-described embodiment, the cross-sectional outline of the tetragonal section is of a substantially square shape. However, the present invention is not limited to this, and the cross-sectional outline of the tetragonal section may be a rectangular shape. The cross-sectional outline of the tetragonal portion can be appropriately set in consideration of the function and the like of the toothbrush. For example, in order to obtain a toothbrush with a softer touch, it is preferable that the cross-sectional outline of the quadrangular portion is flat in the thickness direction. This is because by making the shape flat in the thickness direction, the brushing pressure can be further relaxed.

In the above-described embodiment, the cross-sectional outline of the tetragonal section has a shape in which the edge of the curve is cut at the corners. However, the present invention is not limited to this and the corners may not be formed at the corners. However, from the viewpoint of alleviating the discomfort felt in the quadrangular pyramid or the like at the time of cleaning, it is preferable that the corner is formed with a curved corner.

Although the cross-sectional outline of the polygonal portion is substantially hexagonal in the above-described embodiment, the present invention is not limited to this, and the cross-sectional outline of the polygonal portion may be a substantially polygonal shape other than a roughly hexagonal shape such as a substantially pentagonal shape, good. A rough polygon such as an approximately pentagonal shape, a rough octagonal shape, and the like is a concept including a shape in which a corner is cut off by a curved line as in the case of the roughly tetragonal shape and the roughly hexagonal shape.

In the above-described embodiment, the cross-sectional contour of the polygonal portion is not formed on the front surface and the rear surface, and the ridgeline is not formed (that is, the surface and the back surface are plane) The ridgeline may be formed on both the front surface and the back surface or on either side. However, from the viewpoint of making the polygonal portion easily bend only in the thickness direction, it is preferable that the front surface and the back surface of the polygonal portion are planar.

In the above-described embodiment, the cross-sectional outline of the tip of the neck portion has an approximately circular shape and the circular portion is formed in the region including the neck tip. However, the present invention is not limited to this, Sectional shape may have a shape other than a substantially circular shape and a circular portion may be formed at a position spaced apart from the tip of the neck portion. However, from the viewpoint of bringing the flocking portion more appropriately into contact with the portion to be cleaned, it is preferable that the cross-sectional outline of the tip of the neck portion is substantially circular.

In the above-described embodiment, the cross-sectional outline of the rear end of the neck portion has a generally hexagonal shape flattened in the thickness direction and the polygonal portion is formed in an area including the neck portion rear end. However, the present invention is not limited to this, Or may be formed at a position spaced apart from the rear end. However, from the viewpoint of more appropriately regulating the amount of bowing of the neck portion, it is preferable that the cross-sectional outline of the neck portion rear end is roughly hexagonal flat in the thickness direction.

In the above-described embodiment, the neck portion is enlarged from the neck portion toward the rear portion of the neck portion. However, the present invention is not limited to this, and the neck portion may be reduced in diameter from the neck portion toward the rear portion of the neck portion Or may be roughly equivalent in diameter from the tip of the neck portion to the rear end of the neck portion. The substantially equivalent diameter is a diameter allowing a deviation of about 15% to 15%, and the deviation is preferably -10% to 10%, more preferably -5% to 5%. However, from the viewpoint of more appropriately alleviating the brushing pressure, it is preferable that the neck portion is enlarged from the tip end of the neck portion toward the rear end portion of the neck portion.

In the above-described embodiment, the handle portion is thinner than the neck portion rear end. However, the present invention is not limited to this, and the handle portion may be enlarged with respect to the rear end of the neck portion.

In the above-described embodiment, the cross-sectional contour of the handle portion is a cross-sectional contour of the neck portion rear end and a roughly topical shape. However, the present invention is not limited to this and any shape of the handle portion may be employed.

In the above-described embodiment, the flocking section is constituted by only the speed of the hair, but the present invention is not limited to this, and for example, a member such as a columnar shape or a prism shape formed of a soft resin may be introduced .

Example

Hereinafter, the present invention will be described in detail by way of examples, but the present invention is not limited to the following description.

(Experimental Examples 1 to 6)

According to the specifications of Table 1, a toothbrush similar to that of Figs. 1A and 1B was produced. The toothbrush of each example has a length L1 of 185 mm of the handle body, a length L2 from the tip of the handle to the rear end of the neck portion of 75 mm, a length L3 of the head portion 29 mm, 9.7 mm. In the head portion, 23 pieces of appearance (made of PBT) having a thickness of 7.5 mil were bundled into a bundle, and the bundle was laid in a flock pattern shown in FIG. 1A to provide a flock.

The obtained toothbrush was evaluated for bending strength, mouth operability and fit feeling, and the results are shown in Table 1.

The cross section A-A in the table is the cross section of the tip of the neck portion as in the cross section A-A of FIG. 1B, and the cross section C-C in the table is the cross section of the neck cross section as in the cross section C-C of FIG. The section B-B in the table is a section at a position of 60 mm from the front end of the handle to the rear end of the handle.

(Assessment Methods)

The neck of the neck portion and the head portion are cracked, cracked, whitened, and the like, and the neck portion and the head portion are damaged. Quot; A ", and a case where damage such as cracks, cracks, or whiteness was observed in the neck portion or the head portion was defined as " C ".

A monitor of 10 persons cleaned the inside of the mouth and evaluated the operability of each example toothbrush. The operability is evaluated in seven steps from 1 point to 7 points, and the higher the operability is, the higher the score is. The average of the 10 monitors was classified into the following criteria, and the operability in the oral cavity was determined.

«Criteria»

S: Average point is 5 points or more.

A: The average score is 4 or more and less than 5 points.

B: Average point is 3 or more and less than 4 points.

C: Average point is less than 3 points.

<Fit>

A 10-person monitor cleaned the inside of the mouth, and the fit feeling of each example toothbrush was evaluated according to the following evaluation criteria. The average point of the 10 monitors was classified into the following criteria, and the fit was judged. It can be said that the higher the evaluation of the fit feeling, the more appropriate the bristles come into contact with the area to be cleaned, the brushing pressure is appropriate, and the cleaning effect becomes higher.

«Evaluation Criteria»

3 points: It matches with the irregularity in the oral cavity, and the skin feels very touching with the appropriate elasticity.

2 points: I feel the texture touching the irregularity in the oral cavity with the moderate elasticity.

One point: It matches with the unevenness in the oral cavity, and the skin does not feel much touch with the moderate elasticity.

0 point: It matches with the unevenness in the oral cavity, and the skin does not feel touch with the appropriate elasticity.

«Criteria»

S: Average point is 2.5 points or more.

A: The average score is 2 or more and less than 2.5 points.

B: Average point is 1.5 or more and less than 2 points.

C: Average point is less than 1.5 points.

[Table 1]

As in the results shown in Table 1, Examples 1 and 2 in which the A-A cross section was an approximately straight circular shape having a diameter of 3 to 3.5 mm all exhibited good fit feeling.

From the comparison between Experimental Examples 1 and 2 and Experimental Examples 4 to 5, it was found that when the handle body is composed of a resin having a bending elastic modulus of 2,000 MPa or more, the fit feeling can be further increased by setting the A-A cross section to a diameter of 3.0 to 4.0 mm.

On the other hand, in Experiment Example 3 in which the shape of the neck portion was changed from an approximately circular shape to an elliptic shape in order from the tip of the neck portion, the fitting feeling was " C "

From these results, it was found that, by applying the present invention, it is possible to enhance the fit feeling and the cleaning effect even if the neck portion is made thinner.

[Industrial Availability]

According to the toothbrush of the present invention, the neck portion has a generally circular cross-sectional contour on the side of the head portion, and has a substantially quadrangular cross-section having respective sides on the front, back and sides as the outline contour of the above- And the outline of the outline of the rectangular cross section is directed toward the side of the handle portion, the corner is positioned on both sides and the outline is a rough polygon flat in the thickness direction. Therefore, even if the neck portion is made thin, Therefore, it is industrially very useful.

According to the toothbrush of the present invention, since the above-mentioned roughly polygonal shape flat in the thickness direction is formed on the surface of the neck portion with an arbitrary one side and the side opposite to any one side is formed on the back surface of the neck portion, Can be more relaxed.

According to the toothbrush of the present invention, since the neck portion is enlarged in the direction from the head portion side toward the handle portion side, it is extremely useful in industry because it can warp the neck portion lighter and make the brushing pressure more appropriate .

1: Toothbrush
2: head portion
4: neck part
6:
10:
40:
42: quadrangular part
44: polygonal part
50: Government
52:
54: Lower side

Claims

And a neck portion extending from the neck portion toward the handle portion side, the neck portion having a cross-sectional contour changing from a side of the head portion toward a side of the handle portion, As a result,
Wherein the neck portion has a generally rectangular cross sectional profile on the side of the head portion and a substantially rectangular cross sectional profile formed on the front surface, the back surface and the side surface as the outline contour of the substantially circular portion faces the handle portion side, Wherein the substantially quadrangular cross-sectional contour is directed toward the handle portion side, and a corner is formed on both sides thereof, and is changed into a rough polygon that is flat in the thickness direction and then connected to the handle portion,
Wherein a substantially polygonal shape flattened in the thickness direction is formed on the surface of the neck portion and a side opposite to the arbitrary one side is formed on the back surface of the neck portion,
The length of the arbitrary one side in the rough polygon flattened in the thickness direction is not less than the length of one side in the substantially tetragonal shape formed on the surface,
Wherein a length of a side opposite to the arbitrary one side in a rough polygon flat in the thickness direction is not less than a length of one side in a rough rectangle formed on the back surface.

The method according to claim 1,
Wherein the neck portion is diametrically opposed to the handle portion side from the head portion side.

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