TWI542330B - Interdental brush - Google Patents

Description

Interdental brush Field of invention

The present invention relates to an interdental brush for cleaning a tooth gap.

The present application claims priority based on Japanese Patent Application No. 2010-166043, filed on Jan.

Background of the invention

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

In general, an interdental brush is known as a brush body formed by holding a wire between twisted metal wires and a grip body having a base end into which the wire of the brush body is inserted. In such an interdental brush, since the brush body is inserted between the narrow adjacent teeth, the diameter of the wire is about 0.23 to 0.40 mm.

In the cleaning of the interdental joint using the interdental brush, the brush body is inserted between the teeth to move it back and forth, and the tartar deposited on the tooth gap is entangled with the wire and removed.

In the interdental brush used in this manner, the bending of the line and the restoration of the linear shape are repeatedly performed. Therefore, once the number of uses increases, the number of bends increases, so the wire is fatigued. Since the above-mentioned fine diameter wire cannot be said to have high strength, once the number of times of use of the interdental brush increases, the wire metal is broken when it is fatigued. This tendency is more pronounced as the diameter of the metal is smaller. In addition, when the teeth of the teeth are cleaned, the line is greatly bent, so that it tends to be more likely to be broken.

Furthermore, in the conventional interdental brush, the breaking position of the wire is easily formed in the vicinity of the boundary between the exposed portion of the wire and the portion embedded in the grip body, etc., once broken at this position, the brush body remains in the tooth gap. The situation. The brush body remaining in the tooth gap, particularly the tooth gap of the molar, is not easily taken out.

Conventionally, in response to the above problems, an invention for improving the durability of the line has been made. Patent Documents 1 to 4 disclose materials or shapes which are selected as part of the fixing line of the grip body when the stress generated in the line is dispersible. Patent Document 5 discloses a method in which a portion of a fixed line of a grip body is a mortar-like recess having a line as a central axis. Patent Documents 6 to 9 disclose a front end portion of a grip body in which a fixing wire is formed of an elastic material.

Advanced technical literature Patent literature

Patent Document 1 Japanese Patent Gazette No. 4008284

Patent Document 2 Japanese Patent Laid-Open Publication No. 2001-204549

Patent Document 3 Japanese Patent Laid-Open Publication No. 2005-224268

Patent Document 4 Japanese Patent Laid-Open Publication No. 4-97744

Patent Document 5 Japanese Patent Laid-Open Publication No. 2000-197520

Patent Document 6 Japanese Patent Publication Gazette No. 2003-513700

Patent Document 7 Japanese Patent Laid-Open Publication No. 9-168426

Patent Document 8 Japanese Utility Model Bulletin No. 4-46576

Patent Document 9 Japanese Utility Model Bulletin No. 4-46577

However, even in the methods described in Patent Documents 1 to 9, it is difficult to obtain sufficient durability. Further, in the interdental brush, it is required to prevent the wire from being broken, and the brush body remains in the tooth gap, and the methods described in Patent Documents 1 to 9 cannot satisfy the requirement.

Therefore, the object of the present invention is to provide an interdental brush which is sufficiently durable, even if the number of uses is large, and the wire is not easily bent.

The interdental brush of the present invention comprises a grip body, a nozzle body protruding from the grip body, and a brush body having a wire inserted into the nozzle body at a base end, wherein the nozzle body has a tapered portion And the straight portion 20b, the tapered portion is tapered toward the front end, and the side surface is concavely curved from the front end to the base end, and the straight portion is extended at the front end of the tapered portion 20a, and is orthogonal to the cross section of the extending direction. The shape is approximately the same in the extending direction, and can be flexed in accordance with the action of the brush body.

Further, in the interdental brush of the present invention, the wire is preferably composed of a Co alloy having a Co content of 30 to 60% by mass.

That is, the first aspect of the present invention relates to an interdental brush including a grip body, a nozzle body protruding from the grip body, and a line inserted into the nozzle body at a base end. a brush body; the nozzle body has a tapered portion and a straight portion, wherein the nozzle body is deflectable in accordance with the operation of the brush body, the tapered portion is tapered toward a front end thereof, and a side surface of the tapered portion is from the front end to the front end The base end is formed with a concave curved surface, and the straight portion is extended at the front end of the tapered portion, and the shape of the cross section orthogonal to the extending direction is approximately the same in the extending direction.

According to a second aspect of the invention, the interdental brush is characterized in that the wire is made of a Co alloy having a Co content of 30 to 60% by mass.

A third aspect of the present invention relates to the interdental brush, wherein a length of the entire nozzle is in a range of 1.0 to 8.0 mm.

According to a fourth aspect of the invention, the interdental brush is characterized in that the length of the tapered portion is in a range of 0.5 to 5.0 mm.

According to a fifth aspect of the invention, the interdental brush is characterized in that the length of the straight portion is in a range of 0.5 to 3.0 mm.

According to a sixth aspect of the invention, the interdental brush is characterized in that the diameter of the nozzle body is in a range of 0.5 to 5.0 mm.

The durability of the interdental brush wire of the present invention is high enough, and even if the number of uses is large, the wire is not easily bent, and the brush body can be prevented from remaining on the tooth gap at the time of wire breakage.

Further, when the wire is composed of a Co alloy having a Co content of 30 to 60% by mass, the effect of the present invention can be particularly exhibited.

Simple illustration

Fig. 1 is a side view showing a main part of an embodiment of the interdental brush of the present invention.

Fig. 2 is a side view showing a state in which the brush body constituting the interdental brush of Fig. 1 is bent.

Fig. 3 is a side elevational view showing the main part of another embodiment of the interdental brush of the present invention.

Fig. 4 is a side view showing a main portion of the interdental brush of the first to fourth comparative examples in which the side surface of the tapered portion is inclined at a certain angle.

Fig. 5 is a side view showing a state in which the brush body constituting the interdental brush of Fig. 4 is bent.

Form for implementing the invention

An embodiment of the interdental brush of the present invention will be described.

Fig. 1 is a side view showing the main part of the interdental brush of the embodiment. The interdental brush 1 includes a grip body 10 for gripping during use, a nozzle body 20 projecting from the front end of the grip body 10, and a brush body 30 attached to the grip body 10 and the nozzle body 20.

The grip body 10 is not particularly limited as long as it can be gripped by a finger, and examples thereof include a columnar shape, a prismatic shape (triangular column shape, a quadrangular prism shape, etc.). Moreover, in order to improve the operability of the interdental brush 1, the grip body 10 may be in a shape of being bent or bent. Further, the grip body 10 may be a neck portion having a grip portion, disposed at a front end of the grip portion, and having a tapered shape toward the front end, and a nozzle body 20 at the front end of the neck portion. .

Further, in order to improve the grip, irregularities may be formed on the surface of the grip body 10, and an anti-slip member such as natural rubber or synthetic rubber may be coated.

The material of the grip body 10 can be a soft resin such as polypropylene, polyethylene, an ethylene-α-olefin copolymer, or a thermoplastic elastomer (for example, a polyolefin elastomer, a polystyrene elastomer, or a polyester elastomer). Styrene (PS), polycarbonate (PC), ABS resin, and the like.

The nozzle body 20 of the present embodiment is configured by a tapered portion 20a and a straight portion 20b, and is bendable in accordance with the operation of the brush body 30.

The tapered portion 20a of the present embodiment is covered with a circumference around the wire 31 in the vicinity of the grip body 10, and has a conical shape, and the diameter is tapered toward the front end to be thin. Further, the side surface 21 of the tapered portion 20a has a concave curved surface from the front end to the base end, and the end surface 22 of the tapered portion 20a on the grip body 10 side has the same shape as the front end surface 11 of the grip body 10.

Since the side surface 21 of the tapered portion 20a has a higher stress dispersion effect due to the line 31, it is preferable to form a concave curved surface whose curvature gradually increases from the front end to the base end of the tapered portion 20a. Further, the curvature of the concave curved surface is represented by a radius of curvature (R).

Further, the concave curved surface of the tapered portion may be formed by two or more concave curved surfaces.

In the present specification, the front end of the tapered portion refers to the end portion on the side of the straight portion of the tapered portion, and the base end of the tapered portion refers to the end portion of the tapered portion on the side of the grip body.

Further, in the present specification, the "shape" includes not only the shape but also the concept of the size. Thus, the same shape is the same as the finger shape and size.

Examples of the soft resin include polypropylene, polyethylene, low-density polyethylene, ethylene-α-olefin copolymer, polyolefin-based elastomer, polystyrene-based elastomer, and polyester-based elastomer.

The material of the tapered portion 20a is preferably the same as the material of the grip body 10 in that the interdental brush 1 can be easily manufactured.

The linear portion 20b of the present embodiment is a columnar body that is extended at the front end of the tapered portion 20a and has approximately the same diameter in the extending direction.

The material of the straight portion can be the same as that of the tapered portion 20a.

When the size of the nozzle body 20 is considered to be the size of the inter-tooth brush 1, the total length is preferably in the range of 1.0 to 8.0 mm, preferably 1.0 to 6.0 mm, and particularly preferably 3.0 to 4.0 mm. The length of the tapered portion 20a is preferably 0.5 to 5.0 mm, more preferably 1.5 to 3.0 mm. The length of the straight portion 20b is preferably 0.5 to 3.0 mm, and more preferably 1.5 to 2.0 mm.

When the entire length of the nozzle body 20 is 1.0 mm or more and the tapered portion 20a and the linear portion 20b are 0.5 mm or more, not only the stress concentration and dispersion effect of the wire 31 is higher, but also the nozzle body 20 can be easily produced. When the entire length of the nozzle body 20 is 8.0 mm or less, the tapered portion 20a is 5.0 mm or less, and the linear portion 20b is 3.0 mm or less, the oral operability (especially inside the oral cavity) is increased.

Further, the diameter of the nozzle body 20 is preferably in the range of 0.5 to 5.0 mm, and preferably in the range of 0.7 to 3.5 mm. In the tapered portion 20a, since the stress concentration dispersion effect of the wire 31 is increased, the diameter of the end surface 22 on the grip body 10 side is preferably 1.1 to 10 times the end surface 23 on the side of the straight portion 20b. Further, the diameter of the end surface 23 on the side of the straight portion 20b of the tapered portion 20a is preferably 0.5 to 1.0 mm. When the diameter of the end surface 23 on the side of the straight portion 20b of the tapered portion 20a is 0.5 mm or more, the tapered portion 20a can be easily formed, and when it is 1.0 mm or less, the stress dispersion effect of the wire 31 is higher.

Further, since the stress concentration dispersion effect of the line 31 is higher, the diameter of the straight portion 20b is preferably 5.0 times or less the diameter of the line 31.

When the diameter of the nozzle body 20 is in the range of 0.5 to 5.0 mm, the shortest distance from the side surface 21 to the line 31 is preferably in the range of 0.01 to 2.3 mm.

The brush body has a wire 31 and a slit cleaning wire 32 provided on the wire 31.

In the present embodiment, the wire 31 is formed by folding one metal wire by two folds and twisting it into a spiral shape, and the folded portion is used as a front end, and the base end 31a side is inserted into the nozzle body 20 and the grip body 10.

The insertion length of the wire 31 in the grip body 10 is preferably 0.1 to 10.0 mm, preferably 1.0 to 4.0 mm. When the insertion length of the wire 31 is 0.1 mm or more, not only the wire 31 can be surely fixed to the grip body 10, but also the stress dispersibility of the wire 31 is higher. However, once it exceeds 10.0 mm, the line 31 is at the apex of the fixability of the grip body 10 and the stress dispersion of the wire 31, which is not advantageous.

The length of the exposed portion of the line 31 on the front end side of the nozzle body 20 is preferably 5 to 20 mm, preferably 6 to 15 mm. When the length of the exposed portion of the line 31 on the distal end side of the nozzle body 20 is 5 mm or more, it is easier to clean the tooth gap, and if it is 20 mm or less, it is excellent in cleaning.

The material of the wire 31 is not particularly limited, and examples thereof include a Worthite iron-based stainless steel, a granulated iron-based stainless steel, a ferrite-based stainless steel, and a Co alloy having a Co content of 30 to 60% by mass. In the middle, the effect of using the nozzle body 20 composed of the tapered portion 20a and the straight portion 20b can be further exerted, and the durability of the wire 31 can be further improved, and a Co alloy having a Co content of 30 to 60% is preferable.

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. When the Co content is 60% by mass or less, the wire 31 is not easily broken during the wire twisting process.

As the Co alloy, it is preferable to add a necessary amount of elements such as Cr, Ni, Mo, C, Mn, Si, W, Fe, and Ti to Co. Specifically, a Co-Cr-Ni alloy, a Co-Cr-Mo alloy, a Co-Cr-W-Ni alloy, a Co-Ni-Cr-Mo alloy, and a Co-Ni-Cr-Mo- can be exemplified. W-Fe alloys, etc. Further, in the Co—Cr—Ni-based alloy, it is preferable to contain 20 to 23% by mass of Cr and 15 to 18% by mass of Ni. In the Co-Cr-Mo alloy, it is preferable to contain Cr27 to 30% by mass, Mo 5.0 to 7.0% by mass, and, if necessary, Ni2.5 mass% or less, and Fe7.5 mass. %the following.

In the Co-Cr-W-Ni alloy, it is preferable to contain Cr19 to 21% by mass, Ni to 9.0% by mass, and W14 to 16% by mass, and Fe3% by mass or less, Mn2. 0% by mass or less and 1.0% by mass or less of Si.

In the Co-Ni-Cr-Mo alloy, it is preferable to contain Cr19 to 21% by mass, Ni33 to 37% by mass, Mo 9.0 to 10.5% by mass, Fe1% by mass, and Ti1% by mass.

In the Co-Ni-Cr-Mo-W-Fe alloy, it is preferable to contain Cr18 to 22% by mass, Ni15 to 25% by mass, Mo3 to 4% by mass, W3 to 4% by mass, and Fe4 to 6 mass. % may contain Mn1 mass% or less, Ti05-3.5 mass%, and Si 0.5 mass% or less as needed.

Further, SPRON 100 (trade name, manufactured by Seiko Instruments Co., Ltd.) having the following composition may be used as the Co alloy, and the composition contains Co 30 to 45 mass%, Ni 10 to 20 mass%, Cr 8 to 15 mass%, and Mo3~. 12% by mass, C0.08%, P0.045% by mass, S0.03% by mass, and the remainder being Fe.

Further, SPRON 500 (trade name, manufactured by Seiko Instruments Co., Ltd.) having the following composition may be used, and the composition contains Co 25 to 45% by mass, Cr 12 to 25% by mass, and Mo 8 to 15% by mass, and the remainder is Ni. By.

Further, NAS604PH (Japan Seiki Co., Ltd. product name) having the following composition may be used, and the composition includes Co 40% by mass or more, Ni 15 to 17.5% by mass, Cr 2 0.5 to 22.5 % by mass, and Mo5.8. ~8.3% by mass, the rest is Fe.

The thickness of the wire 31 can be suitably selected in the range of 0.18 to 0.40 mm, and the thinner the diameter of the wire 31, the easier it is to bend, so that the effect of the present invention can be particularly exerted. Further, in the product of the interdental brush 1, the size can be divided according to the thickness of the line 31. The size can be marked with SSSS (4S), SSS (3S), SS (2S), S, M, L, etc., or 1 to 6 marks or numbers.

The length of the portion of the wire 31 provided with the wire 32 is considered to be suitable for the use of the interdental brush 1, that is, the shape of the tooth gap, and may be selected, for example, 5 to 15 mm.

The wire 32 is clamped to a wire 31 twisted into a spiral shape, and is attached so that each wire 32 has a line 31 as a central axis and extends in a radial shape. When the wire 32 is attached to the wire 31 in a radial shape, when the brush body 30 is inserted into the tooth gap, the wire 32 is easily contacted with the teeth, and the tartar removal property is increased.

The length of the wire 32 is preferably 1.0 to 7.0 mm from the insertion property to the tooth gap and the removal of tartar. Further, in the present embodiment, in order to improve the insertability to the tooth gap, the wire 32 is short on the distal end side and long on the proximal end side.

The material of the wire 32 may be exemplified by a thermoplastic resin such as polyamine (nylon), polybutylene terephthalate (PBT), polypropylene, or polybutylene terephthalate (PTT).

When the interdental brush 1 is used and the tooth gap is cleaned, the grip body 10 is gripped, and the brush body 30 is inserted by bringing the front end of the brush body 30 toward the tooth gap and toward the tooth gap. Then, the interdental brush 1 is moved, and the brush body 30 is moved back and forth in the tooth gap to clean the tooth gap.

At this time, in particular, when the brush body 30 is pulled back to the outside of the mouth, the wire 31 is bent.

In the interdental brush 1, as shown in Fig. 2, when the wire 31 is bent, the nozzle body 20 located around it is also bent together with the wire 31. Here, since the side surface 21 of the tapered portion 20a of the nozzle body 20 has a concave curved surface from the front end to the base end, it is gradually curved toward the front end side. According to the tapered portion 20a, since the sharp bending of the wire 31 can be suppressed, the stress generated in the wire 31 can be sufficiently dispersed.

Further, in the present embodiment, since the straight portion 20b is extended at the front end of the tapered portion 20a, the stress generated by the wire 31 can be more dispersed. Therefore, the durability of the wire 31 is sufficiently improved, and the wire 31 is less likely to be bent even if the number of uses is increased.

Further, when the nozzle body 20 having the tapered portion 20a and the straight portion 20b is used to disperse the stress generated by the wire 31, the breakage of the wire 31 can be generated inside the nozzle body 20. Therefore, as shown in Fig. 3, since the base end 31a of the wire 31 can be brought closer to the nozzle body 20 than the front end portion 11 of the grip body 10, the movement of the nozzle body 30 can be made softer, and it can be expected The durability of the line 31 is improved. Further, it is also expected to improve the appearance and cost by the molding. The base end 31a of the wire 31 is preferably at least between the end face 23 and the front end portion 11. Even if the wire 31 is broken, the brush body 30 is not separated as long as it is inside the nozzle body 20, and can be taken out together with the nozzle body 20.

Further, as shown in Fig. 4, the side surface 24 of the tapered portion 20c is inclined from the front end to the base end, and the interdental brush 2 outside the scope of the present invention which is inclined at an angle is bent as shown in Fig. 5. At the same time, the tapered portion 20c hardly bends, and does not follow the action of the brush body 30. Therefore, in the tapered portion 20, there is no effect of dispersing the stress, and the exposed portion P of the wire 31 on the tip end side of the nozzle body 20 is sharply bent and the stress is concentrated. Therefore, not only the wire 31 is easily broken, but also the wire durability is insufficient. Further, the probability that the exposed portion P of the wire 31 is broken is increased, and when the wire is broken, the brush body 30 cannot be prevented from remaining in the tooth gap.

The present invention is not limited to the above embodiment. For example, in the present invention, the tapered portion 20a is not conical, and the straight portion 20b may be non-cylindrical. For example, the cross-sectional shape of the tapered portion 20a may be a weight of an ellipse, a triangle or more, a star shape, or the like. The cross-sectional shape of the straight portion 20b can be determined in accordance with the tapered portion 20a.

Further, the length of the wire 32 does not need to be short at the front end side, and is long at the base end side, and can be uniform, and the front end side can be made long and short at the base end side.

Example First embodiment

As shown in Fig. 1, the insert molding is performed by injection molding, and includes a grip body 10, a nozzle body 20, and a brush body 30, and the nozzle body 20 has a concave portion 20a and a straight portion 20b having a concave curved surface on the side surface. The constructer is the interdental brush of the first embodiment.

Further, the entire length of the nozzle body 20, the diameter of the end surface 22 on the grip body 10 side of the tapered portion 20a, and the diameter of the straight portion 20b are as shown in Table 1. Further, the grip body 10 is a cylinder made of polypropylene. The line 31 of the brush body 30 is made of a high-strength Co-based alloy wire having a diameter of 0.20 mm (size: 4 S) (manufactured by Nippon Seisaku Co., Ltd., NAS604PH, Co: 40% by mass or more, and Ni: 15 to 17.5% by mass). , Cr: 20.5~22.5% by mass, Mo: 5.8~8.3% by mass, and the rest is iron). The wire 32 was made of 6,12-nylon fiber having a diameter of 0.051 mm. The portion of the wire 31 provided with the wire 32 has a length of 10 mm, and the portion of the wire 32 which is not provided has a length of 1.0 mm.

Second embodiment

In addition to using a high-strength Co-based alloy wire (manufactured by Nippon Seisaku Co., Ltd., NAS604PH) having a diameter of 0.23 mm (size: 3 S), the twister replaces the high strength of 0.20 mm (size: 4 S). The Co-based alloy wire was used as the wire 31, and the rest was performed in the same manner as in the first embodiment, and an interdental brush was obtained.

Third embodiment

In addition to a general-purpose stainless steel wire having a diameter of 0.20 mm (size: 4S) (made by Nippon Seisakusho Co., Ltd., NAS106N, Ni: 10% by mass, Cr: 22% by mass, Mo: 2% by mass, Mn: 5.9 mass) %, C: 0.015 mass%, N: 0.40 mass%, and the remainder is iron.) After twisting, the twister replaces the high-strength Co-based alloy wire having a diameter of 0.20 mm (size: 4S) as the line 31, and the rest The first embodiment was carried out in the same manner, and an interdental brush was obtained.

Fourth embodiment

In addition to the use of a general-purpose stainless steel wire (manufactured by Nippon Seisen Co., Ltd., NAS106n) having a diameter of 0.23 mm (size: 3S), the twister replaces a general-purpose stainless steel wire having a diameter of 0.20 mm (size: 4 S) as a line 31. The rest was carried out in the same manner as in the third embodiment, and an interdental brush was obtained.

First comparative example

The grip body 10, the nozzle body 20, and the brush body 30 are formed by insert molding by injection molding, and the nozzle body is composed of a straight portion 20b as shown in Fig. 4 and a tapered portion 20c whose side surface 24 is inclined at a constant angle. The interdental brush of the first comparative example.

Further, the size of the nozzle body 20 is as shown in Table 1. The grip body 10 and the brush body 30 are the same as in the first embodiment. A high-strength Co-based alloy wire (manufactured by Nippon Seisakusho Co., Ltd., NAS604PH) having a diameter of 0.20 mm (size: 4 S) was used as the wire 31 of the brush body 30 after being folded.

Second comparative example

In addition to using a high-strength Co-based alloy wire (manufactured by Nippon Seisakusho Co., Ltd., NAS604PH) having a diameter of 0.23 mm (size: 3S), the twister replaces the high strength of 0.20 mm (size: 4S). The Co-based alloy wire was used as the wire 31, and the rest was performed in the same manner as in the first comparative example, and an interdental brush was obtained.

Third comparative example

The grip body 10, the nozzle body 20, and the brush body 30 are formed by insert molding by injection molding, and the nozzle body is composed of a straight portion 20b as shown in Fig. 4 and a tapered portion 20c whose side surface 24 is inclined at a constant angle. The interdental brush of the second comparative example.

Further, the size of the nozzle body 20 is as shown in Table 1. The grip body 10 and the brush body 30 are the same as in the first embodiment. A general-purpose stainless steel wire (manufactured by Nippon Seisaku Co., Ltd., NAS106N) having a diameter of 0.20 mm (size: 4S) was used as the wire 31 of the brush body 30 after being folded.

Fourth comparative example

In addition to the use of a general-purpose stainless steel wire (manufactured by Nippon Seisen Co., Ltd., NAS106N) having a diameter of 0.23 mm (size: 3S), the twister replaces a general-purpose stainless steel wire having a diameter of 0.20 mm (size: 4 S) as a line 31. The rest was carried out in the same manner as in the third comparative example, and an interdental brush was obtained.

The line durability of each of the interdental brushes of the first to sixth examples and the first to fourth comparative examples was evaluated by the following repeated bending fatigue test.

Repeated bending fatigue test

First, the grip body 10 of the interdental brush 1 is fixed to the collet, and a weight of 100 g is suspended by a thin wire to the front end of the wire 31. In this state, the line 31 was reversely reversed at a speed of 90° (180° total) and 30 times/min. Thereby, the number of inversions until the line is broken due to fatigue is measured. Further, the fracture position was visually confirmed. The results are shown in Table 1.

In the interdental brush of the first to fourth embodiments in which the tapered portion and the straight portion having the concave curved surface are used as the nozzle body, the number of inversions from the line to the fracture is large, and the line durability is excellent. Further, the line break position is the inside of the nozzle body.

On the other hand, in the interdental brush of the first to fourth comparative examples in which the tapered portion and the straight portion which are inclined at a certain angle on the side surface are used as the nozzle body, the number of inversions from the line to the break is small, and the line durability is insufficient. . The line break position is an exposed portion slightly closer to the front end side of the nozzle body.

Further, in the first embodiment, the first comparative example, the second embodiment, and the second comparative example of the high-strength Co-based alloy wire, the number of times of the overturning was compared with the number of times of the first embodiment. The number of repetitions in the second embodiment was 3.2 times that of the second comparative example.

On the other hand, the third embodiment of the general-purpose stainless steel wire, the third comparative example, the fourth embodiment, and the fourth comparative example compare the number of times of repetition, and the number of times of repetition in the third embodiment is 4.7 times that of the third comparative example. The number of repetitions in the fourth embodiment was 2.4 times that of the fourth comparative example.

From these results, it is understood that durability can be improved when a high-strength Co-based alloy is used. In addition, when the surface of the tapered portion having a concave curved surface is used as the nozzle body, the durability improvement effect is large when the nozzle is inclined at a constant angle with respect to the side surface of the tapered portion. From this, it can be seen that when a nozzle body composed of a high-strength Co-based alloy wire and a tapered portion having a concave curved surface and a straight portion is combined, the synergistic effect can be exhibited with respect to improvement in wire durability.

Industrial availability

The durability of the interdental brush wire of the present invention is high enough, and even if the number of uses is increased, the wire is not easily bent, and the brush body remains in the tooth gap when the wire is broken. Further, when the wire is composed of a Co alloy having a Co content of 30 to 60% by mass, the effects of the present invention can be particularly exerted.

1,2. . . Interdental brush

10. . . Grip body

11. . . Front end face

20. . . Nozzle body

20a, 20c. . . Cone

20b. . . Straight line

21,24. . . side

22,23. . . End face

30. . . Brush body

31. . . line

31a. . . Base end

32. . . wire

P. . . Exposed part

Fig. 1 is a side view showing a main part of an embodiment of the interdental brush of the present invention.

Fig. 2 is a side view showing a state in which the brush body constituting the interdental brush of Fig. 1 is bent.

Fig. 3 is a side elevational view showing the main part of another embodiment of the interdental brush of the present invention.

Fig. 4 is a side view showing a main portion of the interdental brush of the first to fourth comparative examples in which the side surface of the tapered portion is inclined at a certain angle.

Fig. 5 is a side view showing a state in which the brush body constituting the interdental brush of Fig. 4 is bent.

1. . . Interdental brush

10. . . Grip body

11. . . Front end face

20. . . Nozzle body

20a. . . Cone

20b. . . Straight line

twenty one. . . side

22,23. . . End face

30. . . Brush body

31. . . line

31a. . . Base end

32. . . wire

Claims (6)

An interdental brush comprising: a grip body; a nozzle body protruding from the grip body; and a brush body being provided with a wire inserted at a base end to the nozzle body; the nozzle body a tapered portion and a linear portion, wherein the nozzle body is deflectable in accordance with the operation of the brush body, the tapered portion is tapered toward the tip end thereof, and a side surface of the tapered portion is formed into a concave curved surface from the front end to the base end, The straight portion is extended at the front end of the tapered portion, and the shape of the cross section orthogonal to the extending direction is approximately the same in the extending direction, and the diameter thereof is 5.0 times or less the diameter of the wire. An interdental brush according to the first aspect of the patent application, wherein the wire is composed of a Co alloy having a Co content of 30 to 60% by mass. For example, in the interdental brush of claim 1, wherein the length of the entire nozzle body is in the range of 1.0 to 8.0 mm. For example, in the interdental brush of claim 1, wherein the length of the tapered portion is in the range of 0.5 to 5.0 mm. For example, in the interdental brush of claim 1, wherein the length of the straight portion is in the range of 0.5 to 3.0 mm. For example, in the interdental brush of claim 1, wherein the diameter of the nozzle body is in the range of 0.5 to 5.0 mm.