JP2004222799A - Interdental brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interdental brush with which an interdental part is easily cleaned and a grip part and a brush part are strongly combined with each other. <P>SOLUTION: The interdental brush consists of: a brush part having a brush shaft part; a brush shaft fixing member fixed to the proximal end of the brush shaft part at the brush part; and the grip part for holding a combining body of the brush part and the brush shaft fixing member. In a state where the proximal end part of the brush shaft part is buried inside of the brush shaft fixing member, the brush part is combined with the brush fixing member. In a state where the proximal end part of a part projecting from the brush shaft fixing member of the brush shaft part and the brush shaft fixing member are buried inside of the grip part and the distal end part of the brush shaft part projects from the distal end part of the grip part, the combining body of the brush part and the brush shaft fixing member is combined with the grip part. The grip part is formed of flexible synthetic resin. The brush shaft fixing member is formed of synthetic resin harder than the material of the grip part. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an interdental brush.
[0002]
[Prior art]
FIG. 8 shows a conventional interdental brush.
[0003]
The interdental brush includes a brush portion 110 having a stainless steel brush shaft portion 111 in which hair is twisted at a tip portion, and a grip portion 120 to which a base end portion of the brush shaft portion 111 is fixed. The brush part 110 is fixed to the grip part 120 as follows. That is, the base end portion of the brush shaft portion 111 in the brush portion 110 is inserted into a mold for forming a gripping portion, and a thermoplastic synthetic resin, which is a material for the gripping portion, is filled into the mold to harden the resin. Thereafter, the mold is opened and the product is taken out. Thereby, a finished product in which the brush part 110 and the grip part 120 are integrated is obtained. Such a method is called insert molding.
[0004]
In addition, as shown in FIG. 8, when the base end part of the brush shaft part 111 embedded in the holding part 120 is linear, the brush shaft part 111 is attached to the holding part 120 as the interdental brush is used. In order to prevent this, the base end portion of the brush shaft 111 may be bent into a U shape, a dogleg shape, or an L shape.
[0005]
By the way, when a hard synthetic resin such as polypropylene is used as the material of the grip portion 120, the ability to hold the base end portion of the brush shaft portion 111 is high, but the tip portion of the grip portion 120 lacks flexibility. Therefore, the entire brush part 110 is difficult to bend, and it is difficult to clean between teeth.
[0006]
On the other hand, when a flexible synthetic resin such as polyethylene is used as the material of the gripping part 120, the tip part of the gripping part 120 is flexible, and the entire brush part 110 is easily bent. However, the ability to hold the proximal end portion of the brush shaft portion 111 is reduced.
[0007]
[Patent Document] JP-A-10-313944
[Problems to be solved by the invention]
An object of the present invention is to provide an interdental brush that is easy to clean between teeth and has a strong coupling between a gripping portion and a brush portion.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is a brush part having a brush shaft part made of stainless steel in which hair is twisted at the tip part, a brush shaft fixing member fixed to the base end part of the brush shaft part in the brush part, The brush portion is coupled to the brush fixing member in a state in which the base end portion of the brush shaft portion is embedded in the brush shaft fixing member. The base end portion of the brush shaft portion protruding from the brush shaft fixing member and the brush shaft fixing member are embedded in the grip portion, and the tip end portion of the brush shaft portion extends from the tip portion of the grip portion. In a protruding state, the combined body of the brush part and the brush shaft fixing member is coupled to the gripping part, the gripping part is formed of a flexible synthetic resin, and the brush shaft fixing member is used as the material of the gripping part. Compared to hard synthetic resin And said that you are.
[0010]
According to a second aspect of the present invention, in the interdental brush according to the first aspect, the brush shaft fixing member includes an anti-rotation protrusion on an outer surface thereof.
[0011]
According to a third aspect of the present invention, in the interdental brush according to the first or second aspect, the gripping portion is made of polyethylene and the brush shaft fixing member is made of polypropylene.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0013]
1 and 2 show an interdental brush.
[0014]
The interdental brush includes a brush portion 10 having a brush shaft portion 11 made of stainless steel with hairs twisted at a tip portion thereof, and a brush shaft fixing member 20 fixed to a base end portion of the brush shaft portion 11 in the brush portion 10. The grip portion 30 holds a combined body (primary molded product) of the brush portion 10 and the brush shaft fixing member 20.
[0015]
The brush portion 10 is coupled to the brush fixing member 20 in a state where the base end portion of the brush shaft portion 11 is embedded in the brush shaft fixing member 20. The base end portion of the brush shaft portion 11 protruding from the brush shaft fixing member 20 and the brush shaft fixing member 20 are embedded in the grip portion 30, and the tip portion of the brush shaft portion 11 is the grip portion 30. A joined body (primary molded product) of the brush part 10 and the brush shaft fixing member 20 is joined to the grip part 30 in a state of protruding from the tip part.
[0016]
As shown in FIGS. 2 to 4, the brush shaft fixing member 20 has a columnar shape, and a pair of wing-shaped rotation prevention protrusions 21 are formed on the lower outer peripheral surface thereof. As a material of the brush shaft fixing member 20, a hard synthetic resin such as PP (polypropylene), AS (acrylonitrile styrene copolymer), ABS (acrylonitrile butadiene styrene copolymer), PET (polyethylene terephthalate), or the like is used. In this embodiment, PP (polypropylene) is used as the material of the brush shaft fixing member 20.
[0017]
As shown in FIGS. 1 and 2, the grip portion 30 includes a cylindrical body portion 31, a truncated cone-shaped neck portion 32 above the body portion 31, and a small-diameter head portion 33 above the neck portion 32. Consists of. As the material of the gripping portion 30, a synthetic resin rich in flexibility such as PE (polyethylene) or EPDM (ethylene propylene diene terpolymer) is used. In this embodiment, PE (polyethylene) is used as the material of the grip portion 30. That is, the grip portion 30 is formed of a synthetic resin having flexibility, and the brush shaft fixing member 20 is formed of a synthetic resin that is harder than the material of the grip portion 30.
[0018]
Hereinafter, the manufacturing method of an interdental brush is demonstrated.
[0019]
The base end portion of the brush shaft portion 11 in the brush portion 10 is inserted into a mold for forming the brush shaft fixing member, and a hard synthetic resin such as polypropylene as a material for the brush shaft fixing member 20 is filled in the mold. And harden the resin. Thereafter, the mold is opened and the product is taken out. As a result, as shown in FIGS. 3 and 4, a primary molded product in which the brush portion 10 and the brush shaft fixing member 20 are integrated is obtained.
[0020]
As shown in FIGS. 5A, 5B, and 5C, the base end portion of the brush shaft portion 11 embedded in the brush shaft fixing member 20 has a U shape, a dogleg shape, and an L shape. It is preferable to bend it.
[0021]
Next, the base end portion of the brush shaft portion 11 that protrudes from the brush shaft fixing member 20 and the brush shaft fixing member 20 are inserted into a mold for forming the grip portion, and polyethylene that becomes the material of the grip portion A synthetic resin having high flexibility such as the above is filled in a mold and the resin is hardened. Thereafter, the mold is opened and the product is taken out. Thereby, as shown in FIGS. 1 and 2, a secondary molded product (finished product) in which the primary molded product and the grip portion 30 are integrated is obtained.
[0022]
According to the embodiment, since the brush shaft fixing member 20 and the brush portion 10 made of hard synthetic resin are joined by insert molding, the brush portion 10 and the brush shaft fixing member 20 are firmly joined. The Further, the brush shaft fixing member 20 has a rotation preventing projection 21, and since the joined body of the brush portion 10 and the brush shaft fixing member 20 and the grip portion 30 are joined by insert molding, the brush portion 10. And the gripping portion 30 are firmly coupled to each other.
[0023]
In addition, since the gripping portion 30 is made of a synthetic resin rich in flexibility, when the interdental brush is used, since the head portion 33 at the tip thereof is easily bent, the entire brush portion 10 is the tip portion of the gripping portion 30. It becomes easy to bend, and it becomes easy to clean between teeth.
[0024]
As shown in FIGS. 6 and 7, as the rotation preventing protrusion 21 formed on the brush shaft fixing member 20, a protrusion 21 a having a letter or symbol cross section may be used. In this example, a plurality of protrusions 21 a are formed in a vertical line on the outer peripheral surface of the brush shaft fixing member 20. The cross sections of the protrusions 21a are formed in the shapes of “K”, “I”, “−”, “W”, “O”, “R”, “K”, and “S”, respectively. As shown in FIGS. 6 and 7, when the protruding end of the protrusion 21a appears on the outer surface of the gripping part 30 in a state flush with the outer surface of the gripping part 30, characters or characters based on the protrusion 21a Since the rows appear on the outer surface of the gripping part 30, it can be used as an external design of the interdental brush.
[0025]
【The invention's effect】
According to the present invention, an interdental brush that is easy to clean between teeth and has a strong coupling between the gripping portion and the brush portion is obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an interdental brush according to an embodiment of the present invention.
FIG. 2 is a partially cutaway perspective view showing an interdental brush according to an embodiment of the present invention.
FIG. 3 is a perspective view showing a primary molded product.
FIG. 4 is a cross-sectional view showing a primary molded product.
FIG. 5 is a cross-sectional view of a primary molded product showing an example in which a base end portion of a brush shaft portion is bent into a U shape, a dogleg shape, or an L shape.
FIG. 6 is a perspective view showing a modification.
7 is a diagram in which a part of FIG. 6 is cut away.
FIG. 8 is a partially cutaway perspective view showing a conventional interdental brush.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Brush part 11 Brush shaft part 20 Brush shaft fixing member 21 and 21a Anti-rotation protrusion 30 Gripping part

Claims (3)

A brush portion having a stainless steel brush shaft portion in which bristles are twisted at a distal end portion, a brush shaft fixing member fixed to a proximal end portion of the brush shaft portion in the brush portion, and a brush portion and a brush shaft fixing member. A gripping portion that holds the combined body, and the brush portion is coupled to the brush fixing member in a state where the base end portion of the brush shaft portion is embedded in the brush shaft fixing member. The brush portion and the brush in a state where the base end portion of the portion protruding from the brush shaft fixing member and the brush shaft fixing member are embedded in the inside of the gripping portion and the tip end portion of the brush shaft portion protrudes from the tip end portion of the gripping portion. The combined body with the shaft fixing member is coupled to the gripping portion, the gripping portion is formed of a synthetic resin having flexibility, and the brush shaft fixing member is formed of a synthetic resin that is harder than the material of the gripping portion. Teeth characterized by Brush. The interdental brush according to claim 1, wherein the brush shaft fixing member includes an anti-rotation protrusion on an outer surface thereof. The interdental brush according to any one of claims 1 and 2, wherein the gripping part is made of polyethylene and the brush shaft fixing member is made of polypropylene.

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