JP3089800U - Replaceable toothbrush - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an injection-molded part to be mated, in which the volume of the jointed state is completely the same as that of a normal toothbrush, which is easy to attach / detach, is hygienic, has a sufficient and multi-stage fitting force. Provide a toothbrush that can be replaced and that can replace the brush part. SOLUTION: A fitting portion provided with an engaging projection and an engaging recess all around the base of a fitting prism having a polygonal cross section perpendicular to the axis is provided on the handle neck side, and the fitting is provided on the inner front side. A mated portion having a mated convex portion and a mated concave portion which are formed over the mating convex portion to complete the mating and have a tapered pressing portion formed on the inner center and rear thereof is provided on the flocking portion side. When the mating portion and the mated portion are mated, a deaeration hole is present at the pressing portion or at a location corresponding to the ridge line of the mating prism, and the toothbrush having a weaker mating force has a cross section perpendicular to the axis. Has a fitting portion provided with an engaging convex portion and an engaging concave portion on a part of the periphery of the base of the fitting prism having a polygonal shape on the handle neck portion side, and has the fitted portion on the flocking portion side.

Description

[Detailed description of the invention]

The present invention relates to a toothbrush having a replaceable brush portion, and more particularly, to a toothbrush having a replaceable brush portion by a fitting structure.

[0002]

[Prior art]

 In recent years, the recycling of products and plastics with a small amount of waste has been demanded due to environmental considerations. Toothbrushes with replaceable brushes can contribute to alleviating these problems. In addition, in recent years, many patterns designed to provide good brushing have been distributed, and the usefulness of toothbrushes with replaceable brush parts is increasing.

[0003] Fig. 4 shows a method of classifying toothbrushes having replaceable brush parts. Broadly speaking, there are a method of disassembling and assembling the planted part and a method of separating and joining at the handle neck.

[0004] Japanese Patent Publication No. 35-14341 (this also includes engagement and fitting), Japanese Utility Model Publication No. 53-84964, Japanese Utility Model Application Laid-Open No. 22221/1995, and Japanese Utility Model Publication No. No. 70331, and the like.

[0005] As a method of separating and joining at the handle neck, there are a screw and a fitting. The fitting has a shape change on both member surfaces, and a linear fitting and a fitting to obtain a fitting force by a fitting; It can be divided into friction fitting using the frictional force of the flat side surface, and special fitting such as fixing with equipment or adding a twist after linear fitting. Japanese Patent Publication No. 35-14441, Japanese Utility Model Publication No. 50-126559 (including special fitting), Japanese Utility Model Publication No. 54-6615, and Japanese Utility Model Publication No. 61-196630 Japanese Utility Model Registration No. 5975 (including screws), Japanese Utility Model Application Laid-Open No. 50-58975, Japanese Utility Model Application Laid-Open No. 52-85663, etc. for friction fitting, and Japanese Utility Model Application No. 50-85663 for special fitting. No. 126,449.

[0006]

[Problems to be solved by the invention]

 First, in the case of disassembling and assembling the flocked part, the brush base is larger than that of a normal toothbrush with a brush and handle integrated, and it gives a bulky feeling when brushing and makes it difficult to polish. In addition, it is difficult to clean dirt and germs accumulated in the inner groove of the brush stand, and it is easy to get unsanitary. Furthermore, if the toothbrush disclosed in Japanese Utility Model Application Laid-Open No. 53-84964 and Japanese Utility Model Application Laid-Open No. 2-221117 is repeatedly used, the joints are liable to be deteriorated. There are many defects. Also, in the toothbrush of Japanese Utility Model Laid-Open No. 5-70331, which is currently on the market, when replacing the brush part, the nylon bristle slips and it is difficult to pick up, so it is hard to say that the brush part is easy to replace. In addition, the toothbrush is not suitable for children with short bristle, as it removes the bristles by picking the bristles.

[0007] The method of separating and joining at the handle neck includes a screw and a fitting, but the replacement of the brush is often performed in a rush in the morning. It is easier and easier to attach and remove.

[0008] A tooth brush disclosed in Japanese Utility Model Publication No. 54-6615 belongs to the locking fitting. Fig. 5 (a) shows a front view of the toothbrush, (b) shows an enlarged plan view of the fitting part (male type), and (c) shows an enlarged cross-sectional view of the fitting part (female type). The toothbrushes are all made of plastic and are separated and joined at the joint line p4. A cantilever beam p5 having a protrusion p6 is formed at the front of the fitting portion, and engages at a locking step p7 at the front end of a hollow hole p8 formed inside the handle grip p3. Here, the locking step p7 needs a height in the direction perpendicular to the axis to obtain the required fitting force. To injection-mold the handle gripping part p3 without crushing the locking step p7, the locking step p7 must be separated by It is necessary to release the two molds and make the entire handle p3 hollow. Therefore, it is necessary to treat the end of the handle grip p3, and it is difficult to form the fitting structure when the handle grip p3 is curved or at the handle neck p2.

As described in Japanese Utility Model Publication No. Sho 54-6615, the locking fitting by the flexible cantilever beam disclosed in Japanese Utility Model Laid-Open Publication No. Sho 50-126449 has a hole in the mating portion on the surface. Not good. In addition, when separating the brush part, it is necessary to insert a needle-like instrument into the hole and remove it, which is not convenient. In addition, if the hole that opens to the outside is closed, it is difficult to form a locking part for the mated part.

There are Japanese Utility Model Publication No. 35-14341 and Japanese Utility Model Application Laid-Open No. 61-196630 in terms of locking engagement in which a projection is formed on the surface of a fitting member. The toothbrush in Japanese Utility Model Publication No. 35-14341 has a large handle neck, which hinders brushing. In addition, when the fitting part is injection-molded, the axial length of the undercut portion is long, so that the injection molding of the fitting part is difficult.

The toothbrush disclosed in Japanese Utility Model Laid-Open Publication No. Sho 61-196630 has a flat, long and tapered fitting member provided with a projection, which is separated at a boundary between a flocked portion and a handle neck portion. At the lower part of the bristle, a fitting part or fitting member is provided. When the fitting part is on the handle neck side, protrusions are provided at the tip and base (however, only the base part in the direction perpendicular to the flocking surface). However, the toothbrush has insufficient strength and fitting force, and the toothbrush has a concave part for engagement when the fitting part is in the flocked part. It collapses at the time of. In addition, the fitting part and the fitting member are provided at the lower part of the bristle, so the brush part becomes large and hinders brushing.

The tooth brushes disclosed in Japanese Utility Model Registration No. 5975 and Japanese Utility Model Laid-Open No. 50-58975, which are friction fittings, have insufficient fitting force, and it is difficult to perform injection molding of a portion to be fitted. The toothbrush disclosed in Japanese Utility Model Laid-Open Publication No. 52-85663 has a large handle neck and may lose its fitting force during repeated brushing, or may be too deeply inserted to be easily separated. In addition, these toothbrushes rotate the brush part.

As a special fitting, Japanese Utility Model Laid-Open Publication No. 50-126449 is raised, but the one fixed with a pin is not preferable because the hole of the fitting part is on the surface as pointed out in Japanese Utility Model Publication No. 54-6615. . In addition, pins must be fixed in order to withstand brushing, and removing the pins when separating the brush part is complicated. Further, in this publication, a toothbrush that twists and locks after fitting the brush portion is shown, but it is difficult to form the fitted portion by injection molding.

The above is the problem of the conventional technology. In addition, there is a difference between the force applied to the fitting part during brushing and the force that can be applied when attaching and detaching the brush part between children, the elderly, and ordinary adults. not exist.

In view of such problems, the present invention has the same volume as a normal toothbrush, can be separated and joined at the narrow handle neck, is easy to attach and detach, is hygienic, and has a sufficient and multi-step fitting force. Another object of the present invention is to provide a toothbrush capable of exchanging the brush portion, which can perform injection molding of the fitted portion.

[0016]

[Means for Solving the Problems]

 In order to achieve the above object, in the toothbrush having a replaceable brush portion according to the present invention, (A) the toothbrush having the maximum fitting force is provided on the entire circumference of the base of the fitting prism having a polygonal cross section perpendicular to the axis. An engaging projection provided with an engaging projection and an engaging recess connected to the engaging projection is provided on the handle neck side. A mating portion having a mating concave portion formed with a tapered pressing portion on the inner center and rear side is provided on the flocked portion side, and when the mating portion and the mating portion are fitted, the pressing portion is pressed. Alternatively, there is a deaeration hole at a position corresponding to the ridge line of the fitting prism, and (B) a toothbrush having a weaker fitting force is formed around the base of the fitting prism having a polygonal cross section perpendicular to the axis. Part of the mating part provided with an engaging convex part and an engaging concave part connected thereto is provided on the handle neck side, and the part to be mated described in (A) is planted. With the section side, characterized in that the brush part is replaceable toothbrush.

[0017]

[Embodiment of the invention]

 An embodiment of the invention will be described with reference to the drawings.

FIG. 1 is a front view showing a state in which a brush part 1 and a handle part 2 of a toothbrush having a maximum fitting force are separated, FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. An enlarged front view showing a part of the joint 6 in a cutaway view and an enlarged front view of the fitting part 5, (b) is a cross-sectional view taken along line XX of (a), and (c) is an arrow A of (a). It is a view.

The cross section of the handle neck 2 is a square having a side of about 5 mm, and the cross section of the fitting prism 7 is a square having a side of about 3 mm. The engaging projection 8 and the engaging recess 9 are provided on the entire outer periphery of the base of the fitting prism 7, and the axial cross-sectional shape of the engaging recess 9 is a curve and a straight line. The axial length of the engaging convex portion 8 and the engaging concave portion 9 is about 1 mm, and the axial length of the entire fitting portion 5 is about 7 mm. The tip of the fitting part 5 is provided with a chamfered part 10 so as to be easily fitted.

Engagement convex portions 11 and engagement concave portions 12 are provided on all inner peripheries in front of the fitted portion 6, and a tapered pressing portion 13 is provided at the center and rear inside. A recess-shaped deaeration hole 14 is formed at a position corresponding to the ridge line 13. The diameter of the pressing part 13 is larger at the rear side than at the center, and the rear part of the pressing part 13 mainly presses the front part of the fitting prism 7. As the fitting proceeds, the air remaining on the inner rear portion of the pressing portion 13 is discharged to the outside through the deaeration hole 14, and the engaged convex portion 11 rides over the engaging convex portion 8 to complete the fitting.

The deaeration hole may be formed as a recessed deaeration hole 14 at a position corresponding to the ridge line of the pressing portion 13 as described above, or a portion corresponding to the ridge line of the pressing portion may be left as it is. A slightly larger radius may be used at the corner, and a gap formed at a position corresponding to the ridge line of the fitting and the fitting prism when fitting is completed may be used as a deaeration hole.

[0022] Recent toothbrushes have an elongated handle neck and flexibility to improve brushing performance, and a simple frictional fitting at the handle neck results in insufficient fitting force. For this reason, it is possible to increase the fitting force by providing the engaging projection 8 on the periphery of the base of the fitting prism 7 and engaging and locking the latter half of the fitting part and the first half of the fitting part by friction fitting. it can. In addition, when the locking fitting is used, the fitting force can be easily adjusted by the number of engaging projections provided on the peripheral side of the base of the fitting prism.

The length of the fitted portion 6 in the axial direction is preferably as short as possible in order to reduce the volume of the brush portion 1 that is frequently replaced. It is desirable that there is no extra empty space at the rear. Therefore, as the fitting progresses, the air remaining in the inner rear portion of the pressing portion 13 has a large pressure increase according to Boyle's law unlike the conventional friction fitting, and a force for pushing back the fitting portion 5 acts. The fitting in which the engaged convex portion 11 rides over the engaging convex portion 8 is not sufficiently completed. For this reason, by forming a deaeration hole at the position corresponding to the ridge line of the pressing portion 13 or the fitting prism 7, it is possible to avoid the compression of the air remaining at the inner rear portion of the pressing portion 13 and sufficiently complete the engagement. Can be done.

The fitting part 5 can be injection-molded integrally with the handle neck part 2 using a polymer material. However, in order to provide durability, a series 1000 or 3000 series having relatively corrosion resistance and hardness is used. It is desirable to press-mold a metal wire such as an aluminum alloy and then insert-mold it into the handle neck 2. The shape of the fitting member embedded in the shank 2 may be arbitrary. First, the chamfered portion 10 and the engaging convex portion 8 and the engaging concave portion 9 of the fitting portion 5 are swaged. Compress in the direction perpendicular to the axis. Also, instead of upsetting, a pair of opposing surfaces may be formed by compression in the direction perpendicular to the axis, and the remaining surface may be compressed and turned by 90 °. The flow of the member to the engaging protrusion 8 is made by the fitting member of the portion embedded in the handle neck portion 2. In this case, in FIG. The corners are almost in contact with each other, and the circumferential length of the protrusions is slightly shorter. In any case, mass production can be performed at high speed with few processes, and there is almost no loss of components. Also, since the engaging recess 9 is open to the outside, it is easy to clean and sanitary.

It is not necessary to provide the deaeration holes at all the positions corresponding to the ridges of the pressing portion or the fitting prism. If the cross section of the handle neck is circular and the fitting prism has a regular hexagonal cross section, for example, It may be provided at a position corresponding to two opposing ridge lines.

The cross-sectional shape in the axial direction of the concavo-convex portion for engagement between the fitting portion 5 and the fitted portion 6 is mainly made of a curved line, but the portion in contact with the engaging portion may be formed as a straight line. .

The portion where the engaging projection 8 is connected to the fitting prism 7 preferably has a small radius in consideration of the life of the mold.

FIG. 3 shows an embodiment of the fitting portion 15 of the toothbrush having the fitting portion 6 shown in FIG. 2 as a common fitting portion and having a weaker fitting force than the toothbrush of FIGS. 1 and 2. (A) is an enlarged front view in which an engaging projection 18 is provided on a part of the periphery of the base of the fitting prism 7 (two opposing sides of the cross section of the fitting prism 7). () Is a view as viewed from the arrow B in (a). The engaging projection may be provided on only one side.

[0029]

[Effect of the invention]

 Since the present invention is configured as described above, the following effects are obtained.

By providing an engaging projection on the periphery of the base of the fitting prism and a pressing portion on the fitted part, the latter half of the fitting part is locked and the first half is friction-fitted, so that it is thin. The fitting force is excellent even at the handle neck.

By forming a deaeration hole at a position corresponding to the ridgeline of the pressing portion or the fitting prism, compression of air accompanying the fitting can be avoided, and there is no pushing back before the fitting is completed, so that the locking fitting can be performed. Completed enough.

In the state where the brush part and the handle neck are joined, the volume is not changed at all from that of a normal toothbrush in which the brush and the handle are integrated, and there is no bulky feeling during brushing and good brushing can be performed.

Since the concave portion of the fitting portion is open to the outside, cleaning is easy and sanitary.

Since the fitting portion has a simple structure, even when a metal material is used, it can be mass-produced at high speed with a small number of steps, and there is almost no loss of members.

The inner surface of the fitted portion can be formed by one mold, and the pressing portion is tapered, so that it is also suitable for mold release.

[0036] By providing an engaging projection on a part of the periphery of the base of the fitting prism with respect to the fitted portion of the toothbrush having the largest fitting force, a toothbrush having a weaker fitting force can be obtained. Thus, a toothbrush handle with a fitting force that can be applied to the same brush part for children, the elderly, etc. and for general adults can be provided.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a front view of a state in which a brush part and a handle part are separated.

FIG. 2 is an enlarged view of a main part of FIG. 1, and FIG. 2 (a) is an enlarged front view showing a part of a part to be fitted cut away and an enlarged front view of a fitting part. (B) is a sectional view taken along line XX of (A).
(C) is a view as seen from arrow A in (a).

FIG. 3 shows an embodiment of the present invention, and (a) is an enlarged front view of a fitting portion. (B) is a view from arrow B in (a).

FIG. 4 is a diagram showing a method category of a toothbrush whose brush part is replaceable.

5 (a) and 5 (b) show an example of a conventional toothbrush having a replaceable brush portion, wherein FIG. 5 (a) is a front view of a joined state, FIG. It is an enlarged cross-sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Brush part 2 Handle neck part 3 Handle grip part 4 Flocked part 5, 15 Fitting part 6 Fitted part 7 Fitting prism 8, 18 Engagement convex part 9, 19 Engagement concave part 10 Chamfer part 11 Engagement convex part 12 Engagement concave part 13 Pressing part 14 Deaeration hole

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[Procedure amendment]

[Submission date] May 22, 2002 (2002.5.2)
2)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction contents]

FIG. 3

Claims (2)

[Utility model registration claims] 1. A toothbrush having a replaceable brush portion, wherein an engaging protrusion and an engaging recess connected to the engaging protrusion are provided on the entire circumference of the base of the fitting prism having a polygonal cross section perpendicular to the axis. Formed on the handle neck side, and formed with the engaged convex portion which goes over the engaging convex portion to complete the fitting on the inside front and the engaged concave portion connected thereto, and a tapered pressing portion at the center and rear inside. The fitting portion is provided on the flocking portion side, and when the fitting portion and the fitting portion are fitted, a deaeration hole is present at a position corresponding to the pressing portion or the ridge line of the fitting prism. A toothbrush whose brush part is replaceable. 2. A toothbrush having a replaceable brush portion, wherein a fitting projection and an engaging recess connected thereto are provided on a part of the periphery of the base of the fitting prism having a polygonal cross section perpendicular to the axis. A replaceable toothbrush comprising a mating portion on a handle neck portion and a fitting portion according to claim 1 on a flocked portion side.