JP2005176906A - Small brush with handle, such as interdental brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive small brush with a handle, such as an interdental brush, which is capable of easily and firmly fixing a brush part to a brush handle. <P>SOLUTION: The brush part 1 is provided with brush bristles 12 on a tip part 11a of a metallic brush shaft 11, and the brush part 1 is retained on a tip part 2a of a brush handle 2 through a base end part 11b of the brush shaft 11. The brush handle 2 comprises a first divided half body 21 and a second divided half body 22, which are longitudinally divided approximately in half in radial direction. Each opposite face 21a and 22a of the divided half bodies 21 and 22 is provided with pressing projections 31-34 which are formed in positions with phase difference with respect to the opposite divided half body in a brush shaft direction. The base end part of the brush shaft 11 is bent in an approximate zigzag shape by an operating force generated at the time of combining the divided half bodies 21 and 22 so that they bites in and engages through the pressing projections 31-34. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a small brush with a handle applied to an interdental brush or a mascara brush.

  This type of small brush, for example, an interdental brush, has a brush portion provided with brush bristles at the tip end of a metal brush shaft held at the tip end portion of the brush handle via the base end portion of the brush shaft. ing. The brush shaft is formed by folding a very thin wire made of SUS, etc., sandwiching the bristle, and twisting this wire around the axis.

  In order to attach such a brush portion to the tip of the brush handle, generally, a brush shaft provided with the brush bristles is arranged in each recess of a mold in which a large number of recesses corresponding to the outer shape of the brush handle are formed. An insert injection molding method is adopted in which a brush handle is molded by injection molding in the installed state, and at the same time, the base end portion of the brush shaft is fixed to each brush shaft.

  Separately from this, a brush shaft insertion hole is formed on the tip surface of a heat-meltable synthetic resin brush handle, the base end of the brush shaft is heated and then inserted into the insertion hole. There is also a method in which the inside of the insertion hole is melted and the brush shaft is fixed to the brush handle by hardening of the molten resin.

  However, in the former method, it is necessary to manually set a very small brush shaft in each recess of the mold, which takes a lot of time and does not exceed the range of batch production. There was a problem of being inferior.

  In the latter method, since the brush handle is melted by the heating temperature of the base end portion of the brush shaft, temperature control on the brush shaft must be strictly managed. In other words, if the heating temperature is low, the resin hardens before the brush shaft is inserted to a predetermined position, resulting in an insufficient insertion state. Conversely, if the heating temperature is high, the resin does not move even if the brush shaft exceeds the predetermined position. There is a problem that curing does not start and the degree of insertion becomes too deep, and it is difficult to adopt in reality.

  Under these circumstances, recently, a brush part having a brush shaft and a brush handle on which the brass part is held have been separately manufactured and developed for mass production.

  For example, conventionally, a bent portion is formed at the base end portion of the brush shaft, while the brush handle is formed of a half-divided body, and a positioning groove portion is formed on the opposing surface of the half-divided body to fit the bent portion. A technique for holding the brush shaft in a predetermined position of the brush handle by coupling both halves in a state where the bent portion of the brush shaft is fitted in the groove (for example, Patent Document 1) is proposed. reference).

Also, a plurality of through holes for inserting push rods are formed in the peripheral wall of the brush handle into which the base end portion of the brush shaft is inserted, and the push rod is pushed into each through hole so that the base end portion of the brush shaft is zigzag-shaped. A technique has also been proposed in which the brush shaft is fixed to the tip of the brush handle by deforming (for example, Patent Document 2).
JP 2003-250633 A (pages 4 to 5 and FIG. 2) Japanese Patent Laid-Open No. 10-155546 (2nd page, FIG. 3)

  However, in the former technique, mass production is possible, and troublesomeness such as heating control is eliminated. However, when the brush portion is held by the brush handle, a bent portion must be formed at the base end portion of the brush shaft. If the bent part of the brush shaft is not properly fitted in the groove of the half body, the brush shaft may be unintentionally detached even if the half body is combined.

  Further, in the latter technique described above, in order to lock the brush shaft inserted into the brush handle, it is necessary to press and hold the push rods into the plurality of through holes of the brush handle. In addition to being troublesome, it is necessary to prepare a push bar bothersomely, resulting in high costs.

  This invention is made | formed in view of the said situation, and makes it a subject to provide a small brush with a handle which can fix a brush axis | shaft to a brush handle simply and appropriately, and can aim at cost reduction.

  In order to solve the above-mentioned problem, the small brush of the invention of claim 1 is characterized in that the brush portion in which the brush bristles are provided at the tip end portion of the metal brush shaft is connected to the tip end of the brush handle via the base end portion of the brush shaft. In the small brush with a handle held by the part, the brush handle is composed of a first divided half and a second divided half that are substantially bisected in the radial direction along the length direction, and the first divided half Each of the opposing surfaces of the half and the second divided half has a positional relationship with a phase difference in the brush axis direction with respect to the other divided half, and receives an operating force when the two divided halves are joined. And a pressing protrusion for bending and engaging the base end of the brush shaft in a substantially zigzag shape.

  Further, in the small brush with handle of the invention of claim 2, a plurality of the pressing protrusions are formed on at least one of the first divided half and the second divided half, and the brush shaft The present invention is characterized in that there are a plurality of portions to be engaged with the base end portion.

  Furthermore, in the small brush with handle of the invention of claim 3, the first divided half and the second divided half are integrally connected to each other via a hinge piece on the rear end side in the brush axis direction. It is characterized by being.

  Furthermore, a small brush with a handle according to a fourth aspect of the present invention is provided on one end of the first divided half and the second divided half so as to be connected to the other divided half. A locking portion that is detachably locked with the formed engaging portion is formed.

  As described above, according to the first aspect of the present invention, the brush portion and the brush handle can be separately provided for mass production, and the second divided half body into which the base end portion of the brush shaft is inserted is second. If the split halves are joined, the base end of the brush shaft is bent and bite and locked by the pressing projection, so there is no need to bend the base end of the brush shaft in advance. The brush shaft can be easily attached to the brush handle, and the brush shaft is bent and zipped in a zigzag manner, so that a firm attachment state of the brush shaft is ensured and a high retaining effect is ensured. Furthermore, it can be manufactured at low cost without the need for special tools or equipment, compared to a method in which the proximal end portion of the brush shaft is inserted into the brush handle and then bent using a push rod.

  According to the second aspect of the present invention, since there are a plurality of portions where the proximal end portion of the brush shaft is engaged by the pressing protrusion, the retaining effect on the brush shaft is more effectively exhibited.

  Furthermore, according to the invention of claim 3, the first divided half and the second divided half are integrally connected to each other via a hinge piece on the rear end side in the brush axis direction. Therefore, both divided halves can be molded at the same time, and can be handled more easily than a separate one, and an assembling operation for combining the two divided halves can be easily performed.

  Furthermore, according to the invention of claim 4, the first divided half and the second divided half that are rotatably connected to each other are releasably locked, so that the brush portion is worn. Even if the whole is not disposable, the brush part can be replaced by releasing the engagement.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 and FIG. 2 are an external perspective view and an exploded perspective view, respectively, showing a small brush with a handle according to an embodiment of the present invention. Here, an interdental brush P used for cleaning the gap between teeth will be described as an example.

  1 and 2, the interdental brush P includes a brush portion 1 and a brush handle 2.

  The brush portion 1 includes a brush shaft 11 and brush hairs 12 held at a tip portion 11a of the brush shaft 11, and brushes an ultrafine wire excellent in corrosion resistance and work hardening resistance such as SUS. The component of the shaft 11 is used. In a state where the wire is folded in half, a large number of filaments constituting the brush bristles 12 are sandwiched at the tip of the wire, and then the wire is twisted around the shaft core so that the brush portion 1 is Is formed.

  The brush handle 2 holds the brush portion 1 via an extended base end portion 11b of the brush shaft 11, and for example, a neck portion 2a as a tapered tip portion formed of synthetic resin, A hollow body portion 2b coupled to the rear end of the neck portion 2a, and a proximal end portion 11b of the brush shaft 11 is formed on the distal end surface of the neck portion 2a as shown in FIG. A small diameter brush shaft insertion hole 23 for insertion is formed in communication with the body 2b.

  The brush handle 2 is substantially divided into two in the radial direction along the length direction, and includes a first divided half 21 including the neck 2a and a second divided half 22 including only the body (2b). It is configured. The rear end of the first divided half 21 in the longitudinal direction (the direction along the brush shaft 11) and the rear end of the second divided half 22 in the longitudinal direction are connected via a hinge piece 24 formed of a thin-walled portion that can be bent and deformed. As a result, the second divided half 22 is opened to the first divided half 21 via the hinge piece 24, and the first divided half 21 is joined to the first divided half 21. Is set so as to be capable of rotational displacement.

  The neck portion 2a of the first divided half body 21 is formed with a hole portion 25 that is located at the boundary with the body portion 2b and penetrates in the radial direction. The peripheral surface side of the first divided half body 21 in the hole portion 20 As shown in FIG. 3, an engagement recess 26 is formed at the opening end of the.

  At the distal end of the second divided half 22 in the longitudinal direction, when the second divided half 22 is combined with the second divided half, the second divided half 22 passes through the hole 25 and can be separated into the engagement recess 25. An engaging L-shaped protrusion 27 is integrally formed. In addition, in order to make this latching protrusion 27 easy to produce the elastic deformation at the time of engagement operation, and to avoid colliding with the brush shaft 11 inserted to the trunk | drum 2b of the 1st division | segmentation half body 21 As shown in FIG. 2, a slot 28 is formed.

  As shown in FIG. 3, the surface 21 a facing the second divided half body 22 in the first divided half body 21 is located at a portion close to the neck portion 2 a, and has a plate-like pressure against the brush shaft 11. The projecting protrusion 31 is integrally formed, and a plate-shaped pressing protrusion 32 with respect to the brush shaft 11 is also formed at a part away from the pressing protrusion 31 by a certain distance.

  On the other hand, on the facing surface 22a facing the first divided half body 22 in the second divided half body 22, as shown in FIG. A plate-like pressing protrusion 33 with respect to the brush shaft 11 is integrally formed at a position corresponding to the protrusion 32 (that is, in the positional relationship of the phase difference in the brush axis direction). A plate-like pressing protrusion for the brush shaft 11 also at a position that is not opposed to the pressing protrusion 32 with a certain distance from the protrusion 33 (that is, in a phase difference positional relationship in the brush axis direction). 34 is integrally formed.

  The pressing protrusions 31 and 32 on the first divided half body 21 side and the pressing protrusions 33 and 34 on the second divided half body 22 side are connected to each other in order to unite both the divided half bodies 21 and 22. When the stop projection 27 is pushed into the hole 25 and engaged with the engagement recess 26, the base end portion 11b of the brush shaft 11 inserted into the brush shaft insertion hole 23 is received by the pushing force. As shown in FIG. 4 (B), it is set to be bent in a zigzag shape and to be engaged and locked. Of course, these pressing protrusions 31 to 34 are not limited to a plate shape, but may be any shape that can deform the brush shaft 11 by the pressing force. Moreover, if the said 1st division | segmentation half 21 and the 2nd division | segmentation half 22 have the space which can bend and deform | transform the said brush shaft 11 with the convex parts 31-34 for a press, the shape can be changed arbitrarily.

  Next, the assembly of the interdental brush P having the above configuration will be described.

  First, the base end portion 11b of the brush shaft 11 in the brush portion 1 is inserted from the brush shaft insertion hole 23 of the brush handle 2, and as shown in FIG. 4 (A), a predetermined position in the first divided half body 21 ( It is inserted to the rearward position in the axial direction exceeding the pressing protrusions 31 and 32.

  In this state, the second split half 22 is rotated about the hinge piece 24, and the locking projection 27 is moved so as to be united with the first split half 21 as shown in FIG. When it is pushed into the hole 25 on the first divided half 21 side, the locking projection 27 is releasably engaged with the engaging recess 26, and the second divided half 22 is bonded to the first divided half 21. Thus, the brush pattern 2 is created.

  When the engaging protrusion 27 is engaged with the engaging recess 26, the pressing protrusion 33 on the first divided half body 31, 32 and the second divided half body 22 side receives the pressing force at that time. As shown in FIG. 4 (B), the nozzles 34 enter with a phase difference while pressing the base end portion 11b of the brush shaft 11. As a result, the base end portion 11b of the brush shaft 11 is bent and deformed in a zigzag shape by the pressing projections 31 to 34 and is locked in a state of being bitten, whereby the brush portion 1 is fixed to the brush shaft 11 at the base end. The brush pattern 2 is held via the part 11b.

  Thus, even if the base end portion 11b of the brush shaft 11 is not subjected to processing such as bending, if the predetermined amount is inserted as it is from the brush shaft insertion hole 23, the first divided half body 21 and the second divided half body 21 are divided. The brush part 1 can be easily held on the brush handle 2 via the base end part 11b of the brush shaft 11 in accordance with the operation of uniting the half body 22, and in the attached state of the brush part 2, Since the base end portion 11b of the brush shaft 11 is bent in a zigzag manner by the pressing protrusions 31 to 34 and is engaged and locked, the retaining action of the brush shaft 11 is effectively exhibited.

  The number of the pressing protrusions 31 to 34 can be arbitrarily changed as long as the brush shaft 11 can be bent and deformed in a zigzag shape. For example, as shown in FIG. 6, two pressing protrusions 32, 33, 34 have two biting locations X, or, as shown in FIG. 7, two pressing protrusions 32, 34. Thus, there may be a single biting point X, or, as shown in FIG. 8, the pressing projections 33 and 34 are concave and the pressing projection 32 (31) is convex. But you can. Among them, from the viewpoint that the function of preventing the brush shaft 11 from being pulled out can be strengthened, the pressing protrusion includes the first divided half 21 and the second divided half 22 including those shown in FIG. It is preferable that at least one of these is formed in a plurality, and in particular, the above-described embodiment in which there are three biting portions X by four pressing protrusions 31 to 34 is recommended.

  By the way, when the bristle 12 of the brush portion 1 is worn out due to long-term use, the engagement between the locking protrusion 27 and the engagement recess 26 is released without disposing the entire brush. If the brush shaft 11 is pulled out after the second divided half 21 is released from the first divided half 22, the new brush portion 11 can be replaced, which is economical.

  In this embodiment, the first divided half 21 and the second divided half 22 are integrally connected via the hinge piece 24 at the rear end in the longitudinal direction. It is also possible to connect the body 21 and the second divided half body 22 via hinge pieces 24 at the respective edges in the width direction.

  Further, as shown in FIG. 9, the tip end of the second split half body 22 is connected to the tip end side of the first split half body 21 via a hinge piece 24, and the locking projection 27 is connected to the second split half body 22. Although the structure provided in the rear end of the longitudinal direction is also possible, the pushing force is effectively transmitted to the brush shaft 11 when the engagement position exists in the vicinity of the pressing protrusions 31 to 34. From the above, the embodiment is recommended.

  Furthermore, as shown in FIG. 10, one or more engagement protrusions 27 and corresponding engagement recesses 26 may be provided on the side edges of the first divided body 21 and the second divided body 22. .

  The first divided half body 21 and the second divided half body 22 are not limited to those connected by the hinge piece 24, but are formed into separate bodies as shown in FIG. , 22 may be combined and bonded by high-frequency heating or an adhesive, in which case both 21, 22, so as not to cause coupling displacement between the first divided half 21 and the second divided half 22. It is preferable to form positioning fitting portions 41, 42 in 22.

  In addition, this invention is applicable not only to the interdental brush P as shown to the said embodiment but to small brushes with various patterns, such as a brush for mascara.

It is an external appearance perspective view which shows the small brush concerning embodiment of this invention. It is a disassembled perspective view which similarly shows a small brush. It is an enlarged sectional view of the important section in a small brush similarly. (A) It is sectional drawing which shows the state which inserted the brush axis | shaft in the brush handle. (B) It is sectional drawing which shows the state which fixed the brush axis | shaft to the brush handle. It is explanatory drawing of the biting state by the protrusion for a press. It is explanatory drawing of the modification of the biting state by the protrusion for a press. It is explanatory drawing of another modification of the biting state by the protrusion for a press. It is explanatory drawing of another modification of the biting state by the protrusion for a press. It is sectional drawing which shows the other example of the connection position of a 1st division | segmentation half and a 2nd division | segmentation half. It is a disassembled perspective view which shows the further another example of the connection position of a 1st division | segmentation half and a 2nd division | segmentation half. It is sectional drawing for description at the time of making a 1st division | segmentation half and a 2nd division | segmentation half into a different body.

Explanation of symbols

1 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Brush part 2 ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Brush pattern 2a ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ Brush pattern tip 11 ・ ・·································································································… ··································································· 1 Split half 24 ·········································································· , 33, 34 .. Protrusion for pressing

Claims (4)

In a small brush with a handle in which a brush portion provided with brush bristles at the tip of a metal brush shaft is held at the tip of the brush handle via the base end of the brush shaft,
The brush handle is composed of a first divided half and a second divided half that are substantially bisected in the radial direction along the length direction.
Each of the opposing surfaces of the first divided half and the second divided half has a positional relationship with a phase difference in the brush axis direction with respect to the other divided half, and the operation when the two divided halves are combined. A small brush with a handle, such as an interdental brush, which is formed with pressing protrusions which receive force and bend the base end portion of the brush shaft in a substantially zigzag shape to engage and lock. A plurality of the pressing protrusions are formed on at least one of the first divided half and the second divided half,
The small brush with a handle such as an interdental brush according to claim 1, wherein there are a plurality of portions to be engaged with a base end portion of the brush shaft. The interdental brush or the like according to claim 1, wherein the first divided half and the second divided half are integrally connected to each other via a hinge piece on the rear end side in the brush axis direction. Small brush with handle. Locking that releasably locks to an engaging portion formed on the other divided half side at one end of the first divided half and the second divided half that are rotatably connected. A small brush with a handle such as an interdental brush according to claim 3 in which a portion is formed.