CN103442614B

CN103442614B - Toothbrush

Info

Publication number: CN103442614B
Application number: CN201280014091.3A
Authority: CN
Inventors: 奥田靖
Original assignee: Lion Corp
Current assignee: Lion Corp
Priority date: 2011-06-20
Filing date: 2012-06-18
Publication date: 2016-06-08
Anticipated expiration: 2032-06-18
Also published as: JP5830277B2; KR20140036187A; CN103442614A; KR102085517B1; JP2013000458A; WO2012176741A1

Abstract

The present invention relates to a kind of toothbrush (1), this toothbrush (1) has handle body (10), described handle body (10) including: in the brushhead (2) planting the pieces (22) being implanted with more than 2 on hair side (20), from the cervical region (4) that described brushhead (2) is extended, and from the extended handle portion (6) of described cervical region (4), in described handle body (10), the cover layer (12) being made up of soft resin it is formed with on the surface of the base station (11) being made up of hard resin, this cover layer covers more than the 70% of the summation of the surface area of described brushhead (2) and the surface area of described cervical region (4), described cover layer (12) is formed the exposed division (14) exposing described base station (11) of more than 1, the axis (O1) of described cervical region (4) is being formed without exposed division (14) as the diad scope of axis of symmetry. in accordance with the invention it is possible to provide a kind of prevent brushhead and cervical region defect, the toothbrush that fractures and easily manufacture.

Description

Toothbrush

Technical field

The present invention relates to a kind of toothbrush.

The Patent 2011-136480 Patent claims priority that the application applied in Japan based on June 20th, 2011, here quotes its content.

Background technology

As toothbrush, it is known to implant the structure of the pieces by tying up bristle of more than 2 near the top of handle body. Generally, handle body includes: be implanted with the brushhead of pieces and via cervical region from the extended handle portion of brushhead, the overall shape in strip.

Considering intraoral operability, the many molding as far as possible of brushhead obtain relatively thin. Furthermore, it is contemplated that intraoral operability, cervical region mostly is the shape than brushhead undergauge.

Generally, handle body is made up of the hard resin of polypropylene etc., but, if stinging with strength when cleaning in oral cavity and brushhead, cervical region being applied excessive burden, then brushhead, cervical region can fracture, or segmental defect.

If for the intensity improving brushhead or cervical region, increase the thickness of brushhead, cervical region or the diameter of increase cervical region, then damage intraoral operability.

Or, if forming rib etc. thus improving the intensity of cervical region at cervical region, then owing to rib contacts in oral cavity, so use sense can be damaged.

For such problem, for instance, it is proposed to there is a kind of toothbrush, cover a face of brushhead and cervical region or whole faces (such as patent documentation 1) of handle body with the soft resin of elastomer resin etc.

Prior art literature

Patent documentation 1: Japanese Patent Publication 02-143035 publication

Invent problem to be solved

But, as the technology of patent documentation 1, if only brushhead and cervical region covered with soft resin, then the volume of the hard resin constituting the core of handle body diminishes, decrease in strength.

If increasing the volume of hard resin, then brushhead, cervical region are thickening, it is easy to infringement operability and use sense.

In addition, even if only a face of brushhead and cervical region being covered with soft resin, the defect of brushhead and cervical region can not be prevented fully, fracture.

In order to handle body is covered with soft resin, first with the core (one-shot forming) of hard resin shaped handle body, then put it in mould, in mould, penetrate soft resin (post forming). Therefore, in post forming, during injection soft resin, there is the postural change due to core, it is difficult to the problem that stable thickness covers soft resin. Especially, whole faces of handle body are covered relatively difficult with the soft resin of stable thickness.

Summary of the invention

Therefore, it is an object of the invention to provide and a kind of be prevented from the defect of brushhead and cervical region, fracture, and the toothbrush easily manufactured.

For solving the means of problem

The present invention relates to a kind of toothbrush, as one aspect of the present invention, this toothbrush has handle body, described handle body includes: in the brushhead planting the pieces being implanted with more than 2 on hair side, from the cervical region that described brushhead is extended, and from the handle portion that described neck extension is arranged, in described handle body, the surrounded surface of the base station being made up of hard resin is formed the cover layer being made up of soft resin, described cover layer covers described brushhead and described cervical region continuously from the top of described brushhead, the area that described cover layer covers is more than the 70% of the summation of the surface area of the surface area of described brushhead and described cervical region, the described cover layer covering described brushhead and described cervical region is formed the exposed division exposing described base station of more than 1, using the axis of the length direction of described cervical region as axis of symmetry with the axisymmetric scope of described exposed division in be formed without described exposed division.

As another aspect of the present invention, the preferably polybutylene terephthalate (PBT) of described hard resin.

That is, the present invention relates to following.

1. a toothbrush, there is handle body, described handle body includes: in the brushhead planting the pieces being implanted with more than 2 on hair side, from the cervical region that described brushhead is extended, and from the handle portion that described neck extension is arranged, in described handle body, the surrounded surface of the base station being made up of hard resin is formed the cover layer being made up of soft resin, described cover layer covers more than the 70% of the summation of the surface area of described brushhead and the surface area of described cervical region continuously from the top of described brushhead, described cover layer is formed the exposed division exposing described base station of more than 1, using the axis of the length direction of described cervical region as axis of symmetry with the diad scope of described exposed division in be formed without described exposed division.

2. according to the toothbrush described in 1, the preferably polybutylene terephthalate (PBT) of described hard resin.

3. the toothbrush according to 1 or 2, described handle body is formed the surface area of surface area and the described cervical region covering described brushhead summation less than more than 70% 95% described cover layer.

Invention effect

Toothbrush according to the present invention, it is possible to prevent the defect of brushhead and cervical region, fracture, and easily manufacture.

Accompanying drawing explanation

Figure 1A is the top view of the toothbrush that first embodiment of the present invention relates to.

Figure 1B is the upward view of the toothbrush that first embodiment of the present invention relates to.

Fig. 1 C is the C-C sectional view of Figure 1A.

Fig. 2 A is the top view of the toothbrush that second embodiment of the present invention relates to.

Fig. 2 B is the upward view of the toothbrush that second embodiment of the present invention relates to.

Fig. 2 C is the side view of the toothbrush that second embodiment of the present invention relates to.

Fig. 2 D is the D1-D1 sectional view of Fig. 2 A.

Fig. 3 A is the top view of the toothbrush that the 3rd embodiment of the present invention relates to.

Fig. 3 B is the upward view of the toothbrush that the 3rd embodiment of the present invention relates to.

Fig. 3 C is the side view of the toothbrush that the 3rd embodiment of the present invention relates to.

Fig. 3 D is the D2-D2 sectional view of Fig. 3 A.

Fig. 4 A is the top view of the toothbrush that the 4th embodiment of the present invention relates to.

Fig. 4 B is the upward view of the toothbrush that the 4th embodiment of the present invention relates to.

Fig. 4 C is the side view of the toothbrush that the 4th embodiment of the present invention relates to.

Fig. 4 D is the D3-D3 sectional view of Fig. 4 A.

Fig. 5 A is the top view of the toothbrush for comparative example.

Fig. 5 B is the upward view of the toothbrush for comparative example.

Fig. 5 C is the side view of the toothbrush for comparative example.

Fig. 5 D is the D4-D4 sectional view of Fig. 5 A.

Fig. 6 A is the top view of the toothbrush for comparative example.

Fig. 6 B is the upward view of the toothbrush for comparative example.

Fig. 6 C is the side view of the toothbrush for comparative example.

Fig. 6 D is the D5-D5 sectional view of Fig. 6 A.

Fig. 7 A is the top view of the toothbrush for comparative example.

Fig. 7 B is the upward view of the toothbrush for comparative example.

Fig. 7 C is the side view of the toothbrush for comparative example.

Fig. 7 D is the D6-D6 sectional view of Fig. 7 A.

Symbol description

1,100,200,300 toothbrush

2 brushhead

4 cervical regions

6 handle portion

10,110,210,310 handle body

11,111,211,311 base station

12,112,212,312 cover layer

14,114,116,118,214,316 exposed division

20 plant hair side

22 pieces

O1 axis

Detailed description of the invention

First embodiment:

1A��Fig. 1 C toothbrush that first embodiment of the present invention is related to below is adopted to illustrate.

Toothbrush 1 shown in Figure 1A��Fig. 1 C has the pieces 22 of handle body 10 and more than 2, and described handle body 10 includes: brushhead 2, from the extended cervical region 4 of brushhead 2 and from the extended handle portion 6 of cervical region 4; What described pieces 22 was implanted in brushhead 2 plants hair side 20.

From the viewpoint of cleaning force, the quantity of pieces 22 is preferably less than more than 2 40, less than more than 10 30 more preferably.

The plan view shape of brushhead 2 is from brushhead top 21 to longer generally rectangular on the direction of cervical region 4, is the corner shape with curve corner cut. Cervical region 4 extends with roughly the same width from brushhead cardinal extremity towards handle portion 6 reduced width when overlooking, and then broadens and is connected with handle portion 6. Handle portion 6 is extended with roughly the same thickness from handle portion cardinal extremity.

The brushhead cardinal extremity of present embodiment, namely brushhead 2 with the border of cervical region 4 is, forms terminal (that is, forming the position of the bending direction change of the curve of the corner cut) P1 (with reference to Figure 1A) of the curve of corner cut in the plan view shape of brushhead 2.

The handle portion cardinal extremity of present embodiment, namely cervical region 4 with the border of handle portion 6 is, when overlooking, position (cervical region terminal) P2 (with reference to Figure 1A) terminated that broadens of cervical region 4.

The width W1 of brushhead 2 can consider intraoral operability etc. and determine, for instance, 8��12mm.

The length L1 of brushhead 2 can consider intraoral operability etc. and determine, for instance, 15��30mm.

The thickness T1 of brushhead 2 can consider intensity that intraoral operability, handle body 10 require etc. and determine, for instance, 3��5mm.

Handle body 10 includes: base station 11 and cover the cover layer 12 on surface of base station 11, and cover layer 12 initially forms from brushhead top 21 to than the handle portion cardinal extremity position closer to the top of handle portion 6. Being formed with 3 exposed divisions 14 exposing base station 11 on cover layer 12, exposed division 14 is circular substantially, and with the outer surface of cover layer 12 in substantially one plane.

It addition, with arbitrary exposed division 14 using the axes O 1 of cervical region 4 as the diad scope of axis of symmetry, be formed without the region that base station 11 exposes. That is, in the present embodiment, in the surface of brushhead 2, only exposed division 14 is formed in the face (bottom surface) of the opposition side planting hair side 20.

Axes O 1 links brushhead cardinal extremity and handle portion cardinal extremity and the center of the arbitrary section through the length direction being perpendicular to cervical region 4.

Base station 11 is the parts of the core constituting handle body 10, and the part forming brushhead 2, cervical region 4 and handle portion 6 is integrated.

Material as base station 11, it may be considered that rigidity, mechanical property etc. that toothbrush 1 requires and determine, for instance elasticity of flexure coefficient (JISK7203) certain hard resin in the scope of 500��3000MPa can be enumerated. As such hard resin, such as can enumerate: polypropylene (PP), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polycaprolactam (PCT), polyformaldehyde (POM), polystyrene (PS), acrylonitrile-butadiene-styrene copolymer resin (ABS), cellulose propionate (CP), polyarylate, Merlon or acrylonitrile-styrene copolymerized resin (AS) etc., wherein PBT is preferred. Due to the intensity height that fractures of PBT, it is possible to prevent the fractureing of handle body 10, segmental defect further. Can use in described hard resin independent a kind or appropriately combined two or more.

The thickness T2 of the base station 11 of brushhead 2 can consider that the material of base station 11 is determined, for instance, 2��4mm.

The thickness of the base station 11 of cervical region 4 is identical with the thickness T2 of the base station 11 of brushhead 11.

Cover layer 12 covers more than 70% (coverage rate 70%) of the summation of the surface area of brushhead 2 and the surface area of cervical region 4, for instance, it is preferred that cover 70��95%, cover 80��90% more preferably. The coverage rate of cover layer 12 is more high, more can be better protected from the defect of brushhead and cervical region, fracture.

The surface area of brushhead 2 refers to, from brushhead top 21 to brushhead cardinal extremity, namely from brushhead top 21 to as the projected area from front (planting hair side 20) brushhead 2 and the P1 on the border of cervical region 4.

The surface area of cervical region 4 refers to, the projected area from front (planting hair side 20) of position (cervical region terminal) P2 terminated that broadens from described P1 to cervical region 4.

The material of cover layer 12 is able to prevent the soft resin of the damage etc. of handle body, such as can enumerate: the elastomer resins such as ethylene octane copolymer, styrenic elastomer or polyester elastomer, wherein from the viewpoint of the defect being reliably prevented base station 11, styrenic elastomer is preferred. As styrenic elastomer, for instance can enumerate: SEPTON (trade name, Kuraray Co., Ltd.'s system) or LEOSTOMER (trade name, Li Yan technology Co., Ltd. system) etc.

Preferably consider that the material of base station 11 determines the material of cover layer 12.

Such as, if the material of base station 11 is PBT, then the material of cover layer 12 preferably styrenic elastomer or polyester elastomer, polyester elastomer is more preferably. It addition, if the material of base station 11 is PP, then ethylene octane copolymer or styrenic elastomer are preferably, but ethylene octane copolymer is more preferably. The material of material Yu cover layer 12 by so combining base station 11, it is possible to reduce cover layer 12 further and peel off from base station 11.

The thickness T3 of cover layer 12 can consider to constitute the material etc. of the resin of cover layer 12 and determine, for instance, preferably, 0.8��1.5mm is more preferably for 0.5��2mm. Time more than above-mentioned lower limit, it is possible to be effectively prevented the damage of handle body 10, time below above-mentioned higher limit, the thickness of brushhead 2 or cervical region 4 will not be blocked up, thus improve the operability of handle body 10.

The diameter R1 of exposed division 14 is not specially limited, it may be considered that the size of brushhead 2 and determine.

Being expressed as exposing of [summation of the area of exposed division]/[area coverage] determines than the coverage rate that can consider cover layer 12, and 0.05��0.3 preferably, and 0.1��0.2 more preferably. Time more than above-mentioned lower limit, easily fixing base station in secondary mould in post forming described later, time below above-mentioned higher limit, cover layer 12 is difficult to peel off.

Area coverage refers to, the summation of the area of cover layer 12 and the area of exposed division 14.

Pieces 22 is to be tied up, by the bristle of less than 40, the pieces forming more than 2.

From planting the hair side 20 length (staple length) to the top 22 of pieces 22, it may be considered that wool elasticity etc. that pieces 22 requires and determine, for instance, 6��13mm.

The staple length of whole pieces 22 can be identical, it is also possible to mutually different.

The thickness (pieces footpath) of pieces 22, it may be considered that pieces 22 require wool elasticity and determine, for instance, 1��2mm. The pieces footpath of whole pieces 22 can be identical, it is also possible to mutually different.

As the bristle constituting pieces 22, for instance can enumerate: be gradually reduced towards its diameter of hair top and the sharpening of hair top bristle (taper hair) or from planting hair side towards the roughly the same bristle (broad wool) etc. of its diameter of hair top. As broad wool, it is possible to enumerate: hair top is generally parallel to plant the plane of hair side 20 or hemispheric bristle is heaved on hair top.

The material of bristle is, for instance can enumerate: the polyamide such as 6-12 nylon (6-12NY) or 6-10 nylon (6-10NY); The polyester such as PET, PBT, PTT (PTT), PEN (PEN) or PBN (PBN); The polyolefin such as PP; Or the elastomer resins etc. such as polyolefin elastomer or ethylene based elastomers.

Can use these resin materials independent a kind or appropriately combined two or more.

It addition, as bristle, there are a kind of polyester bristle with multiple cored structure, described multiple cored structure has: core and be arranged at the sheath portion of more than at least 1 layer of outside of described core.

The shape of cross section of bristle is not specially limited, it is possible to be the circle such as circular or ellipse; The cloverleaf pattern etc. of star, the cloverleaf pattern of three blades or four blades. The shape of cross section of whole bristles can be identical, it is also possible to different.

The thickness of bristle can consider that material etc. is determined, if cross section is circular, for instance be 6��9mil (1mil=1/1000inch=0.025mm).Furthermore, it is contemplated that use sense, brush sweep sense, cleaning effect or durability etc., it is also possible to the bristles of different for thickness more than two are carried out combination in any use.

The manufacture method of toothbrush 1, such as can enumerating such a method, the method includes: forms the molding procedure of cover layer 12 (post forming) after molding base station 11 (one-shot forming) on the board obtained and then implants the implantation operation of pieces 22 in brushhead 2.

One-shot forming refers to following operation: use a pair one time mould, a pair of mould is formed with the cavity corresponding with the shape of base station 11, the hard resin (being sometimes referred to as a resin) of base station 11, molding base station 11 is constituted to the injection of above-mentioned cavity.

Then post forming refers to following operation: use a pair two times moulds, the pair of secondary mould is formed with the cavity corresponding with the shape of cover layer 12, the base station 11 one-shot forming obtained is filled in the cavity of post forming, constitute the soft resin (being called secondary resin) of cover layer 12 to the injection of secondary mould, form cover layer 12. The shape of the cavity of secondary mould is, when being filled in cavity by base station 11, the space formed between base station 11 and the cavity loaded is corresponding with the shape of cover layer 12.

During post forming, base station 11 being formed with the protuberance corresponding with the shape of exposed division 14, this protuberance abuts with the inner surface of secondary mould. Therefore, it is formed with the gap corresponding with the shape of cover layer 12 at the internal stability of secondary mould. In addition, during injection secondary resin, also ensure that the gap corresponding with the shape of cover layer 12, it is possible to be stably formed cover layer 12 with required thickness.

Planting mao operation is implant pieces 22 in brushhead 2 and make the operation of toothbrush 1. The method for implantation of pieces 22 can use known method, for instance can enumerate lenticular wire and plant a mao method: the pieces doubling being made up of the bristle of more than 2, inserts anti-avulsion parts (lenticular wire) in-between, is followed closely by this lenticular wire into planting pore thus fixing pieces. This lenticular wire can be those that have previously been known structure, for instance can enumerate: the tabular lenticular wire of pyrite system or aluminum.

As mentioned above, toothbrush according to present embodiment, surface at the base station constituted with hard resin, it is formed with the cover layer being made up of soft resin, this cover layer covers more than the 70% of the summation of the surface area of brushhead and the surface area of cervical region, even if so brushhead, cervical region are applied excessive burden, handle body is not easy to fracture. Even if it addition, handle body fractures at brushhead or cervical region etc., it is also possible to prevent exposing of break-off portion, or keep releasing part with cover layer.

Toothbrush according to present embodiment, owing to being formed with the exposed division making base station expose of more than 1 on the cover layer, it is possible to be stably formed cover layer with the thickness needed.

Toothbrush according to present embodiment, owing to being formed without exposed division in the diad scope using the axis of cervical region as axis of symmetry, so when tooth bites brushhead or cervical region, no matter maxillary tooth or lower jaw teeth are all without directly contacting exposed division. In addition, even if brushhead or cervical region are applied load from any direction, it is also possible to relax load by cover layer. It is therefore prevented that brushhead or cervical region are applied excessive burden, it is possible to prevent the defect of brushhead and cervical region, fracture.

Second embodiment:

2A��Fig. 2 D toothbrush that second embodiment of the present invention is related to below is adopted to illustrate.Also the description thereof will be omitted for the symbol identical for the structure tag identical with the first embodiment, and mainly the point different from the first embodiment is illustrated. The point that present embodiment is different from the first embodiment is, the shape of exposed division and the position of exposed division.

The toothbrush 100 of present embodiment has the handle body 110 being formed with cover layer 112 on the surface of base station 111. On the bottom surface of brushhead 2, it is formed with substantially semi-circular exposed division 114 near brushhead top 21, is formed with the exposed division 116 of substantially tetragon near brushhead cardinal extremity. It addition, on the bottom surface of cervical region 4, be formed with the generally rectangular exposed division 118 extended along axes O 1 direction from brushhead cardinal extremity to handle portion cardinal extremity.

As shown in Figure 2 D, exposed division 118 and the outer surface of cover layer 112 are in substantially one plane. Exposed division 114 and exposed division 116 also identically with exposed division 118 with the outer surface of cover layer 112 in substantially one plane.

It addition, using axes O 1 as axis of symmetry with in the diad scope of exposed division 114,116 and 118, be formed without the region exposing base station 111.

The length l1 of exposed division 114 can consider length of brushhead 2 etc. and determine, for instance, 5��15mm. The width W1 of exposed division 114 can consider width of brushhead 2 etc. and determine, for instance, 3��8mm.

The length l2 of exposed division 116 can consider length of brushhead 2 etc. and determine, for instance, 3��5mm. The width of exposed division 116 is identical with the width w1 of exposed division 114.

The width w2 of exposed division 118 can consider width of cervical region 4 etc. and determine, for instance, 1��4mm.

According to present embodiment, owing to being formed with exposed division in brushhead and cervical region, so can more stably fix base station in secondary mould.

3rd embodiment:

3A��Fig. 3 D toothbrush that the 3rd embodiment of the present invention is related to below is adopted to illustrate. Also the description thereof will be omitted for the symbol identical for the structure tag identical with the first embodiment, and mainly the point different from the first embodiment is illustrated. The point that present embodiment is different from the first embodiment is, the shape of exposed division and the position of exposed division.

The toothbrush 200 of present embodiment has the handle body 210 being formed with cover layer 212 on the surface of base station 211. On cover layer 212, bottom surface is formed with from brushhead 2 to cervical region 4 the generally rectangular exposed division 214 extended along axis direction.

As shown in Figure 3 D, exposed division 214 and the outer surface of cover layer 212 are in substantially one plane.

It addition, using axes O 1 as axis of symmetry with in the diad scope of exposed division 214, be formed without the region exposing base station 211.

The width w3 of exposed division 214 can consider width of cervical region 4 etc. and determine, for instance, 1��4mm.

According to present embodiment, owing to complex-shaped exposed division need not be formed, it is possible to more easily stably fix base station in secondary mould.

4th embodiment:

4A��Fig. 4 D toothbrush that the 4th embodiment of the present invention is related to below is adopted to illustrate. Also the description thereof will be omitted for the symbol identical for the structure tag identical with the first embodiment, and mainly the point different from the first embodiment is illustrated. The point that present embodiment is different from the first embodiment is to be formed with generally rectangular exposed division on the bottom surface of cervical region.

The toothbrush 300 of present embodiment has the handle body 310 being formed with cover layer 312 on the surface of base station 311.In cover layer 312, the bottom surface of brushhead 2 is formed 3 exposed divisions 14, and on the bottom surface of cervical region 4, is formed with 1 generally rectangular exposed division longer on the direction of axes O 1.

As shown in Figure 4 D, exposed division 316 and the outer surface of cover layer 312 are in substantially one plane.

It addition, using axes O 1 as axis of symmetry with in the diad scope of exposed division 316, be formed without the region exposing base station 311.

The length l3 of exposed division 316 can consider length of brushhead 2 etc. and determine, for instance, 1��5mm. The width w4 of exposed division 316 can consider width of cervical region 4 etc. and determine, for instance, 1��4mm.

According to present embodiment, owing to being formed with exposed division in brushhead and cervical region both sides, so can more stably fix base station in secondary mould.

Other embodiment:

The present invention is not limited to above-mentioned embodiment.

In the first��the 4th embodiment, the outer surface of exposed division and cover layer is in substantially one plane, but the present invention is not limited to this, it is possible to be exposed division from the prominent structure of the outer surface of cover layer, it is also possible to be the structure of the exposed division outer surface depressions from cover layer.

In the first��the 4th embodiment, only form exposed division in the face (bottom surface) of the opposition side planting hair side, but the present invention is not limited to this, it is also possible to form exposed division in face (upper surface) or the side towards the direction identical with planting hair side. Or, it is also possible in bottom surface, any 2 face exposed divisions formed above of upper surface and side.

If in bottom surface, any two face exposed division formed above of upper surface and side, then can more stably fix base station in secondary mould.

In embodiment first and the 4th, being formed with substantially orbicular exposed division in brushhead, but the present invention is not limited to this, the shape of exposed division can also be oval or generally polygonal. Generally polygonal concept is, including the shape that corner is notched with straight line or curve.

In order to suppress the stripping of cover layer, the shape of exposed division preferably circular or ellipse circle or with the polygon of curve corner cut.

In the second��the 4th embodiment, the shape being formed at the exposed division of cervical region is generally square, but the present invention is not limited to this, and the shape being formed at the exposed division of cervical region can also be circular.

In Figure 1B, Fig. 2 B, Fig. 3 B or Fig. 4 B, the quantity of exposed division 14,114,116,118,214 or 316 is 1,3 or 4, but the present invention is not limited to this. The quantity of exposed division 14,114,116,118,214 or 316 can be determined according to design, and 1��5 preferably, and 2��4 more preferably.

In the first��the 4th embodiment, cover layer is formed at the scope starting to comprise handle portion cardinal extremity from brushhead top. But, as long as cover layer covers more than the 70% of the summation of the surface area of brushhead and the surface area of cervical region, for example, it is possible to start to the front of handle portion cardinal extremity from brushhead top to form cover layer, it is also possible to form cover layer to the top of handle portion.

The implantation pattern of the pieces of the present invention, is not specially limited, and whichever will do in the combination of so-called clathrate, zigzag and these shapes.

Embodiment:

Below, it is shown that also the present invention is described in detail for embodiment, but the present invention is not limited to following record.

Embodiment 1:

Using the base station material shown in table 1 as a resin manufacture base station, then on base station, form cover layer, the identical toothbrush of toothbrush 100 of Fig. 2 A��Fig. 2 D of manufacture and following specification using the cover layer material shown in table 1 as secondary resin.For the toothbrush obtained, evaluate its brushhead intensity, cervical region intensity, with or without separating and mouldability, and its result is represented in Table 1.

" polyesters " of the material of the cover layer in table represents polyester elastomer, and " TPO " represents ethylene octane copolymer, and " phenylethylene " represents styrenic elastomer.

Specification:

The width of brushhead: 8.5mm

The length of brushhead: 22mm

The thickness of brushhead: 4.5mm

The width of cervical region: 5mm

The length of cervical region: 50mm

The length l1:5mm of exposed division 114

The width w1:4mm of exposed division 114

The length l2:3mm of exposed division 116

The width w2:2mm of exposed division 118

The thickness of cover layer: 0.8mm

Embodiment 2:

Base station material and cover layer material are according to table 1, except being following specification except exposed division, manufacture the toothbrush identical with the toothbrush 200 of Fig. 3 A��Fig. 3 D identically with embodiment 1. For the toothbrush obtained, evaluate its brushhead intensity, cervical region intensity, with or without separating and mouldability, and its result is represented in Table 1.

Specification:

The width w3:2mm of exposed division 214

Embodiment 3:

Base station material and cover layer material are according to table 1, except being following specification except exposed division, manufacture the toothbrush identical with the toothbrush 300 of Fig. 4 A��Fig. 4 D identically with embodiment 1. For the toothbrush obtained, evaluate its brushhead intensity, cervical region intensity, with or without separating and mouldability, and its result is represented in Table 1.

Specification:

The diameter of exposed division 14: 3mm

The length l3:3mm of exposed division 316

The width w4:2mm of exposed division 316

Comparative example 1:

Except base station material and cover layer material are according to, except table 1, manufacturing the toothbrush identical with the toothbrush 700 of Fig. 5 A��Fig. 5 D identically with embodiment 1. For the toothbrush obtained, evaluate its brushhead intensity, cervical region intensity, with or without separating and mouldability, and its result is represented in Table 1.

Toothbrush 700 has the handle body 710 that the coating cap rock 712 of entirety of base station 711 covers. The coating cap rock 712 of the 100% of the summation of the surface of the brushhead 2 of handle body 710 and the surface area of cervical region 4 covers, and is formed without exposed division.

Comparative example 2:

Base station material and cover layer material are according to table 1, except not carrying out post forming, manufacture the toothbrush identical with the toothbrush 800 of Fig. 6 A��Fig. 6 D identically with embodiment 1. For the toothbrush obtained, evaluate its brushhead intensity, cervical region intensity, with or without separating and mouldability, and its result is represented in Table 1.

Toothbrush 800 does not form cover layer on handle body 810, is only made up of base station.

Comparative example 3:

Base station material and cover layer material are according to table 1, except being following specification except exposed division, manufacture the toothbrush identical with the toothbrush 900 of Fig. 7 A��Fig. 7 D identically with embodiment 1. For the toothbrush obtained, evaluate its brushhead intensity, cervical region intensity, with or without separating and mouldability, and its result is represented in Table 1.

Toothbrush 900 has the handle body 910 being formed with cover layer 912 on the surface of base station 911. In cover layer 912, the upper surface at cervical region 4 is formed with generally rectangular exposed division 914, and is formed with generally rectangular exposed division 916 in the bottom surface of cervical region 4. As illustrated in fig. 7d, exposed division 914 and exposed division 916 are formed in the diad scope that axes O 1 is axis of symmetry.

Specification:

The width w5:2mm of exposed division 914

The width w6:2mm of exposed division 916

Evaluation methodology:

Brushhead intensity:

What prepare to have cut off the pieces of toothbrush of each example and brushhead plants the sample that hair side is smooth.

The brushhead cardinal extremity of this sample is held with fixture, sample is fixed on digital shock machine (DG-1 type, Co., Ltd.'s Dongyang essence mechanism is made made), increase the weight of 0.5J, the absorption energy (J) when mensuration (n=10) brushhead is disrumpent feelings to planting hair side. Hereinafter state the metewand meansigma methods to this measured value to classify, evaluate brushhead intensity.

Metewand:

More than A:0.3J

More than B:0.2J and less than 0.3J

More than C:0.1J and less than 0.2J

D: less than 0.1J

Cervical region intensity:

Hold the handle portion cardinal extremity of the sample of fixing each example with fixture, increase the weight of 2kg, the rupture strength (N) when mensuration (n=10) cervical region is disrumpent feelings from planting hair side side. Hereinafter state the metewand meansigma methods to this measured value to classify, evaluate brushhead intensity.

Metewand:

More than A:100N

More than B:70N and less than 100N

More than C:40N and less than 70N

D: less than 40N

With or without separation:

Measure the handle body after brushhead intensity and cervical region intensity with visualization, evaluate the separation with or without handle body.

B: do not separate.

D: separate.

Mouldability:

To be visually confirmed to be the toothbrush of each example, and evaluate the degree of the filling bad (lack of fill) of soft resin according to following metewand. With 10 toothbrushes, mouldabilities are evaluated for each example, its average mark be more than 4.0 points be " A ", more than 3.0 points and be " B " less than 4.0 points, more than 2.0 points and be " C " less than 3.0 points, less than 2.0 points is " D ".

Metewand:

5: the thickness of cover layer is uniform, do not find that cover layer has deformation, defect completely.

4: do not find that cover layer has deformation, defect, however, it was found that not up to the scope of specific thickness be not enough cover layer 10% scope.

3: do not find that cover layer has deformation, defect, however, it was found that not up to the scope of specific thickness be cover layer more than 10% and scope less than 50%.

2: do not find that cover layer has deformation, defect, however, it was found that be 50% range above of cover layer not up to the scope of specific thickness.

1: find that cover layer has deformation, defect.

Overall merit:

According to brushhead intensity, cervical region intensity, with or without separate and mouldability evaluation result, carry out overall merit according to following evaluation.

Metewand:

A: whole evaluation results is " B " or " A ", and " A " is more than 2.

B: whole evaluation results is " B " or " A ", and " A " is less than 1.

C: whole evaluation results is " C ", " B " or " A ", and " C " is more than 1.

D:1 above evaluation result is " D ".

Table 1:

As shown in table 1, applying embodiments of the invention 1��3, whichever overall merit is all " B " or " A ". It addition, embodiment 1��3, whichever is all good in intraoral operability and use sense.

On the other hand, the mouldability of the comparative example 1 not forming exposed division is " D ", and the handle body not forming the comparative example 2 of cover layer finds to separate. Using the axis of cervical region as axis of symmetry, the cervical region intensity being formed with the comparative example 3 of exposed division in the diad scope being axis of symmetry with the axis of cervical region is " C ".

From above result it can be seen that pass through to apply the present invention, it is possible to obtain being prevented from the defect of brushhead and cervical region, fractureing, and the toothbrush easily manufactured.

Industry utilizes probability

A kind of it is prevented from the defect of brushhead and cervical region in accordance with the invention it is possible to provide, fractures, and the toothbrush easily manufactured.

Claims

1. a toothbrush, has handle body, and described handle body includes: planting the brushhead of the pieces being implanted with more than 2 on hair side, from the extended cervical region of described brushhead and the handle portion that arranges from described neck extension, this toothbrush is characterised by,

In described handle body, the surrounded surface of the base station being made up of hard resin is formed the cover layer being made up of soft resin, described cover layer covers described brushhead and described cervical region continuously from the top of described brushhead, the area that described cover layer covers is more than the 70% of the summation of the surface area of the surface area of described brushhead and described cervical region

The described cover layer covering described brushhead and described cervical region is formed the exposed division exposing described base station of more than 1, using the axis of the length direction of described cervical region as axis of symmetry with the diad scope of described exposed division in be formed without described exposed division.

2. toothbrush according to claim 1, it is characterised in that described hard resin is polybutylene terephthalate (PBT).

3. the toothbrush according to claims 1 or 2, it is characterised in that be formed on described handle body the surface area of the surface area covering described brushhead and described cervical region summation less than more than 70% 95% described cover layer.