KR20130036051A - Interdental brush - Google Patents

Abstract

The interdental brush of the present invention includes a handle body, a nozzle body protruding from the handle body, and a brush body having a filament provided in a wire inserted into the base end of the nozzle body, wherein the nozzle body has a tapered portion and a straight portion, The nozzle body is flexible to follow the behavior of the brush body, the tapered portion gradually tapers toward its tip, and the side of the tapered portion forms a concave curved surface from the tip to the base, and the straight portion, The shape of the cross section orthogonal to the tapered portion and orthogonal to the speech direction relates to an interdental brush which is approximately the same throughout the speech direction. ADVANTAGE OF THE INVENTION According to this invention, even if the durability of a wire is high enough and the use frequency increases, the interdental brush which a wire is hard to bend can be provided.

Description

Interdental Brush {INTERDENTAL BRUSH}

The present invention relates to an interdental brush for cleaning an interdental.

This application claims priority in 2010/23/23 based on Japanese Patent Application No. 2010-166043 for which it applied to Japan, and uses the content for it here.

The interdental brush is mainly used as an auxiliary cleaning tool for cleaning a gap (interdental) between a tooth and a tooth which is difficult to clean with a toothbrush.

As a general interdental brush, what consists of the brush body which clamped the filament between the butted metal wires, and the handle body in which the base end of the wire of the said brush body was inserted is known. . In such interdental brush, in order to insert a brush body in a narrow adjacent interdental, the thing of the diameter of a wire about 0.23-0.40 mm is used.

In the interdental cleaning using the interdental brush, the brush body is inserted into the interdental and reciprocally transferred to remove the plaque and the like deposited in the interdental while intertwining with a filament.

In the interdental brush at the time of use in this way, restoration of a wire and a linear shape are repeated. Therefore, as the number of times of use increases, the number of times of bending increases, so that the wires are made of metal. Since the above-mentioned thin wire cannot be said to have high strength, the number of times of use of the interdental brush increases, so that the wire breaks when the metal is fatigued. This tendency is remarkable as the diameter of the wire becomes smaller. In addition, when cleaning the interdental of molar teeth, since the wire bends large, there is a tendency to break more.

In addition, in the conventional interdental brush, the break position of the wire tends to be near the boundary between the portion exposed by the wire and the portion embedded in the handle body or the like, and when broken at the position, the brush body may remain in the interdental. . The brush body remaining in the interdental, particularly the interdental of the molar, is difficult to extract.

Conventionally, the invention which aimed at the durability improvement of a wire is made | formed about the said problem. In Patent Documents 1 to 4, it is disclosed that a material capable of dispersing a stress generated in a wire at the time of bending as a material or shape of a portion for fixing the wire of the handle body. Patent Literature 5 discloses a method in which a portion for fixing a wire of a handle body is used as a protruding recess having the wire as a central axis. Patent Documents 6 to 9 disclose that an end portion of a handle body to which a wire is fixed is formed of an elastic material.

Japanese Patent No. 4008284 Japanese Patent Laid-Open No. 2001-204549 Japanese Patent Application Laid-Open No. 2005-224268 Japanese Patent Laid-Open No. 4-97744 Japanese Patent Application Laid-Open No. 2000-197520 Japanese Patent Publication No. 2003-513700 Japanese Patent Laid-Open No. 9-168426 JP-A 4-46576 JP-A 4-46577

However, it was difficult to obtain sufficient durability also by the method of patent documents 1-9. Further, in the interdental brush, it is required to prevent the wire from breaking and the brush body remains in the interdental, but the method described in Patent Documents 1 to 9 could not satisfy the demand.

Then, an object of this invention is to provide the interdental brush which is hard to bend even if the durability of a wire is high enough and the use frequency increases.

The interdental brush of the present invention includes a handle body, a nozzle body protruding from the handle body, and a brush body in which filaments are provided on a wire in which a proximal end is inserted into the nozzle body. Toward the end of the tapered portion and the tapered portion 20a of the tapered portion 20a, and the shape of the cross section perpendicular to the extending direction is It is provided with the substantially same straight part 20b over the speech direction, and it is characterized by following the movement of the said brush body, and being flexible.

Moreover, in the interdental brush of this invention, it is preferable that the said wire consists of Co alloy of 30-60 mass% of Co content.

That is, the 1st side surface of this invention is equipped with a handle body, the nozzle body protruding in the said handle body, and the brush body in which the filament was provided in the wire in which the base end was inserted in the said nozzle body,

The nozzle body has a tapered portion and a straight portion,

The nozzle body is flexible to follow the behavior of the brush body,

The tapered portion is gradually tapered toward the distal end thereof, and a side surface of the tapered portion forms a concave curved surface from the distal end to the proximal end.

The said straight part is related to the interdental brush which speaks to the front-end | tip of the said taper part, and the shape of the cross section orthogonal to a speech direction is substantially the same across a speech direction.

The 2nd side surface of this invention relates to the said inter-gear brush which the said wire consists of Co alloy of 30-60 mass% of Co content.

The 3rd side surface of this invention relates to the said gear-to-gear brush whose whole length of the said nozzle body is a range of 1.0-8.0 mm.

The 4th side surface of this invention relates to the said inter-gear brush whose length of the said taper part is 0.5-5.0 mm.

A fifth aspect of the present invention relates to the brush between gears, wherein the length of the straight portion is in a range of 0.5 to 3.0 mm.

A sixth aspect of the present invention relates to the brush between gears, wherein the nozzle body has a diameter in the range of 0.5 to 5.0 mm.

The interdental brush of the present invention has a sufficiently high durability of the wire, even if the number of times of use increases, the wire is hard to be broken, and the brush body can be prevented from remaining in the interdental when the wire breaks.

Moreover, the effect of this invention is exhibited especially when a wire consists of Co alloy of 30-60 mass% Co content.

BRIEF DESCRIPTION OF THE DRAWINGS The side view which shows the principal part of one Embodiment of the interdental brush of this invention.
FIG. 2 is a side view illustrating a state in which the brush body constituting the interdental brush of FIG. 1 is bent. FIG.
3 is a side view showing a main part of another embodiment of the interdental brush of the present invention.
Fig. 4 is a side view showing the main part of the interdental brush of Comparative Examples 1 to 4, in which the side of the tapered portion is inclined at a constant angle.
FIG. 5 is a side view illustrating a state in which the brush body constituting the interdental brush of FIG. 4 is bent. FIG.

An embodiment of the interdental brush of this invention is described.

1, the side view of the principal part of the interdental brush of this embodiment example is shown. This interdental brush 1 is attached to the handle body 10 gripped at the time of use, the nozzle body 20 protruding from the tip of the handle body 10, the handle body 10 and the nozzle body 20. The brush body 30 is provided.

The handle body 10 is not particularly limited as long as it is a shape that can be gripped by a finger, and examples thereof include a cylinder shape and a prismatic shape (a triangular shape, a square shape, and the like). In addition, the handle body 10 may be a curved or curved shape in order to improve the operability of the interdental brush 1. In addition, the handle body 10 may be provided with a grip part and a tapered neck part which is arrange | positioned at the front-end | tip rather than a grip part, and becomes taper as it goes to the front end, and the nozzle body 20 may be provided in the front-end | tip of a neck part.

In addition, in order to improve grip property, the unevenness | corrugation may be formed in the surface of the handle body 10, and the anti-skid members, such as natural rubber and synthetic rubber, may be coat | covered.

As a material of the handle body 10, for example, polypropylene, polyethylene, ethylene-α-olefin copolymer, thermoplastic elastomers (for example, polyolefin-based elastomers, polystyrene-based elastomers, polyester-based elastomers) Soft resins such as Stormer), polystyrene (PS), polycarbonate (PC), ABS resin and the like can be used.

The nozzle body 20 in this embodiment is comprised from the taper part 20a and the straight part 20b, and it is going to follow the behavior of the brush body 30, and to be flexible.

The taper part 20a in this embodiment covers the circumference | surroundings of the wire 31 of the vicinity of the handle body 10, is conical, and diameter gradually becomes small and taper toward the tip. Moreover, the side surface 21 of the taper part 20a forms the concave curved surface from the front-end | tip to the base end, and the end surface 22 of the handle body 10 side of the taper part 20a is the line of the handle body 10. It is the same shape as the cross section 11.

Since the side surface 21 of the tapered part 20a becomes higher in the stress dispersing effect of the wire 31, it is preferable to form the concave curved surface from which the curvature becomes gradually larger toward the base end direction from the tip of the tapered part 20a. Do. In addition, the curvature of the said concave curved surface is shown by the radius of curvature (R).

The concave curved surface of the tapered portion may be composed of two or more concave curved surfaces.

In this specification, the tip of a taper part means the edge part of the straight part side of the said taper part, and the base end of a taper part means the edge part of the side of the handle body of the said taper part.

In addition, in this specification, "shape" is a concept including not only a shape but a magnitude | size. Therefore, the same shape means the same shape and size.

Examples of the soft resins include polypropylene, polyethylene, low density polyethylene, ethylene-α-olefin copolymers, polyolefin-based elastomers, polystyrene-based elastomers, polyester-based elastomers, and the like.

It is preferable to make the material of the taper part 20a the same as the material of the handle body 10 from the point which can manufacture the interdental brush 1 easily.

The straight part 20b in this embodiment is the pillar-shaped object which speaks to the front-end | tip of the taper part 20a, and is substantially the same in diameter across a speech direction.

As a material of the straight part 20b, the thing similar to the taper part 20a can be used.

Considering the size of the interdental brush 1, the dimension of the nozzle body 20 preferably has a total length of 1.0 to 8.0 mm, more preferably 1.0 to 6.0 mm, more preferably 3.0 to 4.0 mm. Is particularly preferred. It is preferable that it is 0.5-5.0 mm, and, as for the length of the taper part 20a, it is more preferable that it is 1.5-3.0 mm. It is preferable that it is 0.5-3.0 mm, and, as for the length of the straight part 20b, it is more preferable that it is 1.5-2.0 mm.

When the total length of the nozzle body 20 is 1.0 mm or more, and the taper portion 20a and the straight portion 20b are 0.5 mm or more, the stress concentration dispersion effect of the wire 31 becomes higher, and the The production becomes easy. If the total length of the nozzle body 20 is 8.0 mm or less, the taper part 20a is 5.0 mm or less, and the straight part 20b is 3.0 mm or less, intraoral operability (especially the inner part of the oral cavity) becomes high.

Moreover, it is preferable that it is the range of 0.5-5.0 mm, and, as for the diameter of the nozzle body 20, it is more preferable that it is the range which is 0.7-3.5 mm. In the tapered portion 20a, since the stress concentration dispersing effect of the wire 31 becomes higher, the diameter of the end face 22 on the handle body 10 side is 1.1 to the end face 23 on the straight part 20b side. It is preferable that it is 10 times. Moreover, it is preferable that the diameter of the end surface 23 of the straight part 20b side of the taper part 20a is 0.5-1.0 mm. If the diameter of the end surface 23 of the straight part 20b side of the taper part 20a is 0.5 mm or more, the taper part 20a can be manufactured easily, and if it is 1.0 mm or less, the stress-dispersion effect of the wire 31 will be carried out. Becomes higher.

Moreover, since the stress concentration-dispersion effect of the wire 31 becomes higher, the diameter of the straight part 20b is more preferably 5.0 times or less of the diameter of the wire 31.

When the diameter of the nozzle body 20 exists in the range of 0.5-5.0 mm, it is preferable that the shortest distance from the side surface 21 to the wire 31 exists in the range of 0.01-2.3 mm.

The brush body 30 includes a wire 31 and a filament 32 for interdental cleaning provided on the wire 31.

In the present embodiment, the wire 31 is folded in two pieces of one metal wire and is folded back, and is twisted in a spiral shape, and the folded part becomes the tip, and the proximal end 31a side is formed. It is inserted in the nozzle body 20 and the handle body 10.

It is preferable that it is 0.1-10.0 mm of insertion length left waves to the handle body 10 of the wire 31, and it is more preferable that it is 1.0-4.0 mm. If the insertion length of the wire 31 is 0.1 mm or more, the wire 31 can be fixed to the handle body 10 reliably, and the stress dispersibility of the wire 31 becomes higher. However, when it exceeds 10.0 mm, the improvement of the fixing property of the wire 31 to the handle body 10, and the stress dispersibility of the wire 31 becomes a limit, and is useless.

It is preferable that it is 5-20 mm, and, as for the length of the exposed part of the wire 31 on the front end side rather than the nozzle body 20, it is preferable that it is 6-15 mm. If the length of the exposed part of the wire 31 on the front end side of the nozzle body 20 is 5 mm or more, it will be easier to clean interdental teeth, and if it is 20 mm or less, it is excellent in the handleability at the time of cleaning.

It does not specifically limit as a material of the wire 31, For example, austenitic stainless steel, martensitic stainless steel, ferritic stainless steel, Co alloy of 30-60 mass% Co content, etc. are mentioned. Among these, since the effect of using the nozzle body 20 comprised of the taper part 20a and the straight part 20b is exhibited more, and the durability of the wire 31 improves more, Co content of 30-60 mass% Co alloy is preferred.

In the Co alloy, when the Co content is 30% by mass or more, the bending strength and the repeated bending fatigue property are higher, and when the Co content is 60% by mass or less, the wire 31 hardly breaks during processing.

As Co alloy, Preferably, necessary amounts of elements, such as Cr, Ni, Mo, C, Mn, Si, W, Fe, Ti, are added to Co. Specifically, Co-Cr-Ni alloy, Co-Cr-Mo alloy, Co-Cr-W-Ni alloy, Co-Ni-Cr-Mo alloy, Co-Ni-Cr-Mo-W- Fe type alloy etc. can be illustrated. Moreover, in Co-Cr-Ni-type alloy, it is preferable to contain 20-23 mass% of Cr and 15-18 mass% of Ni. Moreover, in Co-Cr-Mo type alloy, it is preferable to contain 27-30 mass% of Cr and 5.0-7.0 mass% of Mo, In addition, 2.5 mass% or less of Ni and 7.5 mass% of Fe as needed. You may include it below.

In Co-Cr-W-Ni alloy, it is preferable to contain 19-21 mass% of Cr, 9.0-11.0 mass% of Ni, and 14-16 mass% of W, In addition, 3 masses of Fe as needed. You may contain% or less, 2.0 mass% or less of Mn, and 1.0 mass% of Si.

In Co-Ni-Cr-Mo alloy, it is preferable to contain 19-21 mass% of Cr, 33-37 mass% of Ni, and 9.0-10.5 mass% of Mo, and 1 mass% of Fe and Ti as needed. 1 mass% may be included.

In Co-Ni-Cr-Mo-W-Fe alloy, 18-22 mass% Cr, 15-25 mass% Ni, 3-4 mass% Mo, 3-4 mass% W, 4 Fe It is preferable to contain-6 mass%, and may contain 1 mass% or less of Mn, 0.5-3.5 mass% of Ti, and 0.5 mass% or less of Si as needed.

Moreover, as Co alloy, 30-45 mass% of Co, 10-20 mass% of Ni, 8-15 mass% of Cr, 3-12 mass% of Mo, 0.08% of C, 0.045 mass% of P, S It contains 0.03 mass% of each, and can use SPRON100 (the Seiko Instool Co., Ltd. brand name) which has a composition of remainder Fe.

Moreover, SPRON500 (trade name of Seiko Instool Co., Ltd.) which contains 25-45 mass% of Co, 12-25 mass% of Cr, and 8-15 mass% of Mo, respectively, and has remainder Ni composition can be used. .

Moreover, NAS604PH (made by Nippon Seisen Co., Ltd.) which contains 40 mass% or more of Co, 15-17.5 mass% of Ni, 20.5-22.5 mass% of Cr, and 5.8-8.3 mass% of Mo, respectively, and has the composition of remainder Fe. Brand name) can be used.

Although the thickness of the wire 31 is suitably selected in the range of 0.18-0.40 mm, for example, since the diameter of the wire 31 becomes thinner, it becomes easy to bend, and the effect of this invention is exhibited especially. In addition, in the product of the interdental brush 1, it classifies size according to the thickness of the wire 31. As shown in FIG. As notation of size, notation using SSSS (4S), SSS (3S), SS (2S), S, M, L, etc., or the symbols and numerals of 1-6 is mentioned.

The length of the portion of the wire 31 in which the filament 32 is provided is appropriately selected in consideration of the use of the interdental brush 1, that is, the shape of the interdental teeth to be assumed, and is, for example, 5 to 15 mm. .

The filaments 32 are sandwiched by spirally twisted wires 31, and are attached such that each filament 32 extends radially with the wire 31 as a central axis. When the filament 32 is attached radially to the wire 31, when the brush body 30 is inserted in the interdental, the filament 32 is easily brought into contact with the teeth, and the plaque is removed.

It is preferable that the length of the filament 32 is 1.0-7.0 mm from the point of insertability to an interdental and a plaque removal property. In addition, in the present embodiment, the filament 32 is shorter at the tip end side and longer at the proximal end side in order to further improve the interdentability.

Examples of the material of the filament 32 include thermoplastic resins such as polyamide (nylon), polybutylene terephthalate (PBT), polypropylene, polytrimethylene terephthalate (PTT), and the like.

When the interdental is cleaned using the separation brush 1, the handle body 10 is gripped, and the brush body 30 is inserted in the interdental direction toward the distal end of the brush body 30 so as to approach the interdental teeth. . Then, the interdental brush 1 is moved to reciprocate the brush body 30 between the interdental to clean the interdental.

In that case, especially when the brush body 30 is pulled back out of a mouth, the wire 31 may bend.

In the interdental brush 1, as shown in FIG. 2, when the wire 31 is bent, the nozzle body 20 around it is also bent together with the wire 31. Here, since the side surface 21 forms the concave curved surface from the front-end | tip to the base end, the tapered part 20a of the nozzle body 20 becomes easy to bend toward the said tip side gradually. According to such a tapered part 20a, since the sudden bending of the wire 31 is suppressed, the stress which arose in the wire 31 can fully be disperse | distributed.

In addition, in this embodiment, since the straight part 20b is extended to the front-end | tip of the taper part 20a, the stress which the wire 31 produced can be disperse | distributed more. Therefore, even if the durability of the wire 31 becomes high enough and the number of times of use increases, the wire 31 becomes difficult to bend.

In addition, when the stress which arises in the wire 31 is disperse | distributed by using the nozzle body 20 provided with the taper part 20a and the straight part 20b, the fracture | rupture of the wire 31 will cause the nozzle body 20 to be disassembled. Can be produced inside. Therefore, as shown in FIG. 3, since the base end 31a of the wire 31 can be made into the nozzle body 20 side rather than the front end part 11 of the handle body 10, the movement of the brush body 30 can be seen more. A flexible movement can be made and the improvement of the durability of the wire 31 can be expected. In addition, improvement in appearance and cost reduction by molding can also be expected. It is preferable that the base end 31a of the wire 31 be at least between the end face 23 and the tip end portion 11. Even when the wire 31 is broken, if the inside of the nozzle body 20 is inside, the brush body 30 is not separated and can be taken out by being accompanied by the nozzle body 20.

In addition, in the interdental brush 2 outside the scope of the present invention in which the side surface 24 of the tapered portion 20c as shown in FIG. 4 is inclined at a constant angle from its tip to its base, as shown in FIG. Similarly, the tapered portion 20c hardly bends when the wire 31 is bent, and does not follow the behavior of the brush body 30. Therefore, the taper portion 20c lacks the effect of dispersing the stress, and the wire 31 bends sharply at the exposed portion P on the tip side of the wire 31 rather than the nozzle body 20, so that the stress concentrates. . Therefore, the wire 31 is easily broken, the wire durability is insufficient, and the probability of breaking at the exposed portion P of the wire 31 is increased, and when the wire is broken, the wire 31 at the interdental area of the brush body 30 is broken. It cannot be prevented from remaining.

This invention is not limited to the said embodiment. For example, in the present invention, the tapered portion 20a may not be conical, and the straight portion 20b may not be cylindrical. For example, the cross-sectional shape of the taper part 20a may be an ellipse, a polygonal shape of triangular shape or more, a star shape made of a star shape or the like. The cross-sectional shape of the straight portion 20b is determined in accordance with the tapered portion 20a.

In addition, the length of the filament 32 is short to the front end side, and it is not necessary to lengthen it at the proximal side, and may be constant, and it may be constant, and you may lengthen the front end side and shorten it at the proximal end side.

Example

(Example 1)

As the interdental brush of Example 1, the handle body 10, the nozzle body 20, and the brush body 30 as shown in FIG. 1 are provided, and the nozzle body 20 has the concave curved surface of the side surface. What consists of the taper part 20a and the straight part 20b made from polypropylene was produced by the insert molding by injection molding.

In addition, the full length of the nozzle body 20, the diameter of the end surface 22 of the tapered part 20a on the handle body 10 side, and the diameter of the straight part 20b were as showing in Table 1. In addition, as the handle body 10, it was set as the cylinder made from polypropylene. As the wire 31 of the brush body 30, a wire made of a high-strength Co-based alloy wire having a diameter of 0.20 mm (size: 4S) (manufactured by Nippon Seishen Co., Ltd., NAS604PH, Co: 40% by mass or more, Ni: 15 to 17.5 mass%, Cr: 20.5 to 22.5 mass%, Mo: 5.8 to 8.3 mass%, the balance of which Fe) was folded and twisted were used. As the filament 32, 6, 12-nylon fibers of 0.051 mm in diameter were used. The length of the part in which the filament 32 was provided in the wire 31 was 10 mm, and the length of the part in which the filament 32 is not provided was 1.0 mm.

(Example 2)

As the wire 31, instead of a wire made of a high strength Co base alloy having a diameter of 0.20 mm (size: 4S), a wire made of a high strength Co base alloy having a diameter of 0.23 mm (size: 3S) (manufactured by Nippon Seishen Co., Ltd., NAS604PH) An interdental brush was obtained in the same manner as in Example 1 except that the folded and twisted one was used.

(Example 3)

As the wire 31, instead of a wire made of a high strength Co-based alloy having a diameter of 0.20 mm (size: 4S), a general purpose stainless steel wire having a diameter of 0.20 mm (size: 4S) (manufactured by Nippon Seishen Co., Ltd., NAS106N, Ni: 10 mass) %, Cr: 22% by mass, Mo: 2% by mass, Mn: 5.9% by mass, C: 0.015% by mass, N: 0.40% by mass, and the balance was the same except that the product was folded and twisted. In the same manner as in 1, an interdental brush was obtained.

(Example 4)

As the wire 31, instead of a general-purpose stainless steel wire having a diameter of 0.20 mm (size: 4S), a general-purpose stainless steel wire (made by Nippon Seishen Co., Ltd., NAS106N) having a diameter of 0.23 mm (size: 3S) was folded and twisted. The interdental brush was obtained like Example 3 except having used this.

(Comparative Example 1)

As the interdental brush of Comparative Example 1, a handle body 10, a nozzle body 20, and a brush body 30 are provided, and the nozzle body has a straight portion 20b and a side surface 24 as shown in FIG. 4. The tapered portion 20c inclined at this constant angle was produced by insert molding by injection molding.

In addition, the dimension of the nozzle body 20 was as showing in Table 1. The handle body 10 and the brush body 30 were the same as those of the first embodiment. As the wire 31 of the brush body 30, a wire made of a high strength Co-based alloy wire (Nippon Seisen Co., Ltd. product, NAS604PH) having a diameter of 0.20 mm (size: 4S) was folded and twisted.

(Comparative Example 2)

As the wire 31, instead of a wire made of a high strength Co base alloy having a diameter of 0.20 mm (size: 4S), a wire made of a high strength Co base alloy having a diameter of 0.23 mm (size: 3S) (manufactured by Nippon Seishen Co., Ltd., NAS604PH) An interdental brush was obtained in the same manner as in Comparative Example 1 except that the folded and twisted one was used.

(Comparative Example 3)

As the interdental brush of Comparative Example 2, the handle body 10, the nozzle body 20, and the brush body 30 are provided, and the nozzle body has a straight portion 20b and a side surface 24 as shown in FIG. 4. The tapered portion 20c inclined at this constant angle was produced by insert molding by injection molding.

In addition, the dimension of the nozzle body 20 was as showing in Table 1. The handle body 10 and the brush body 30 were the same as those of the first embodiment. As the wire 31 of the brush body 30, the general stainless steel wire (Nippon Seisen Co., Ltd. product, NAS106N) of 0.20 mm in diameter (size: 4S) was folded and twisted.

(Comparative Example 4)

As the wire 31, instead of a general-purpose stainless steel wire having a diameter of 0.20 mm (size: 4S), a general-purpose stainless steel wire (made by Nippon Seishen Co., Ltd., NAS106N) having a diameter of 0.23 mm (size: 3S) was folded and twisted. Except having used the thing, it carried out similarly to the comparative example 3, and obtained the interdental brush.

[Table 1]

The wire durability of each interdental brush of Examples 1-6 and Comparative Examples 1-4 was evaluated by the following repeated bending fatigue test.

[Repeat Bending Fatigue Test]

First, the handle body 10 of the interdental brush 1 was fixed to the chuck, and the weight of 100 g was dripped on the tip of the wire 31 using a fine thread. In that state, the wire 31 was repeated and inverted at the speed of 90 degrees (total 180 degrees) and 30 times / part each on the left and right sides. This measured the number of reversals until the wire broke due to fatigue. In addition, the breaking position was visually confirmed. The results are shown in Table 1.

In the interdental brush of Examples 1 to 4, in which the side face was composed of a tapered portion and a straight portion of a concave curved surface, the number of reversals until the wire broke was large, and the wire durability was excellent. In addition, the wire breaking position was the inside of a nozzle body.

On the other hand, in the interdental brush of Comparative Examples 1-4 which used the thing comprised by the taper part and the straight part which inclined at the fixed angle as a nozzle body, the number of reversals until a wire break | ruptured was small, and wire durability was inadequate. The wire breaking position was a portion where the tip side was exposed slightly more than the nozzle body.

In addition, when the wire compared with the repetition frequency with respect to Example 1, Comparative Example 1, Example 2, and Comparative Example 2 of the wire made of high-strength Co base alloy, the repetition number of Example 1 was 6.2 times that of Comparative Example 1, and Example The number of repetitions of 2 was 3.2 times that of Comparative Example 2.

On the other hand, when the wire is compared to the number of repetitions in Example 3, Comparative Example 3, Example 4 and Comparative Example 4 of the general-purpose stainless steel wire, the number of repetitions of Example 3 is 4.7 times that of Comparative Example 3, repetition of Example 4 The recovery was 2.4 times that of Comparative Example 4.

From these results, it turned out that durability is improved when using a high-strength Co base alloy wire. Furthermore, when using the thing in which the side surface of a taper part became a concave curved surface as a nozzle body, it turned out that the durability improvement effect is larger than the case where the side surface of a taper part was inclined at a fixed angle as a nozzle body. Thereby, when combining the high-strength Co base alloy wire, the nozzle body comprised from the tapered part and the straight part in which the side surface became concave curved surface, it turned out that the synergistic effect is exhibited regarding the improvement of wire durability.

[Industrial Availability]

The interdental brush of the present invention has a sufficiently high durability of the wire, even if the number of times of use increases, the wire is hard to be broken, and the brush body can be prevented from remaining in the interdental when the wire breaks. Moreover, the effect of this invention is exhibited especially when a wire consists of Co alloy of 30-60 mass% Co content.

1, 2: interdental brush
10: handle body
11: cross section
20: nozzle body
20a, 20c: taper
21, 24: side
22, 23: cross section
20b, 20e: straight part
30: brush body
31: wire
31a: air mass
32: filament

Claims (6)

A handle body, a nozzle body protruding from the handle body, and a brush body provided with a filament in a wire having a proximal end inserted into the nozzle body;
The nozzle body has a tapered portion and a straight portion,
The nozzle body is flexible to follow the behavior of the brush body,
The tapered portion is gradually tapered toward the distal end thereof, and a side surface of the tapered portion forms a concave curved surface from the distal end to the proximal end.
The interdental brush is characterized in that the straight portion is addressed to the tip of the tapered portion, and the shape of the cross section orthogonal to the speech direction is substantially the same throughout the speech direction. The method of claim 1,
The interdental brush, wherein the wire is made of a Co alloy having a Co content of 30 to 60 mass%. The method of claim 1,
The interdental brush of the whole length of the said nozzle body is a range of 1.0-8.0 mm. The method of claim 1,
Interdental brush, characterized in that the length of the tapered portion is in the range of 0.5 to 5.0mm. The method of claim 1,
Interdental brush, characterized in that the length of the straight portion is in the range of 0.5 to 3.0mm. The method of claim 1,
The interdental brush, the diameter of the nozzle body is in the range of 0.5 to 5.0mm.

Images