JPH07327737A - Toothbrush - Google Patents

Abstract

PURPOSE:To provide a toothbrush which can reduce the manufacturing cost thereof while sufficiently ensures a slip preventing effect, and which can enhance the strength and rigidity against bending of a handle part so as to enhance the manipulability of the tooth brush. CONSTITUTION:A handle part 9 is composed of a handle base 2 made of synthetic resin materials, and a rubber part 7 made of synthetic rubber materials. A front recess 11 and a rear recess 12 are formed in the handle base 2, near the distal end thereof, and a through hole 13 piercing from the front surface to the rear surface and making both recesses 11, 12 communicate with each other is formed in the base 1. Further, an annular recess 14 is formed in the base 2 near the proximal end thereof. Further, a communication passage 15 making the rear recess 12 communicate with the annular recess 14 is formed in the intermediate part of the base 2. A front slip preventing part 20, a rear slip preventing part and an annular lip preventing part 22 are formed by filling synthetic rubber material in the front, rear and annular recesses 11, 12, 14 having their surfaces substantially flush with the outer surface of the base 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush whose handle portion is composed of a handle base made of a synthetic resin material and a rubber portion made of a synthetic rubber material.

[0002]

2. Description of the Related Art Conventionally, in order to prevent the handle portion of a toothbrush from slipping and improve the operability of the toothbrush, the handle portion is made of a synthetic rubber material on the front and back sides of a handle base made of a synthetic resin material. Various anti-slip parts have been proposed and put to practical use.

Usually, the toothbrush is a resin base material composed of a flocked portion, a neck portion and a handle base, in which a molding cavity of a mold is filled with a synthetic resin material. A resin base material is formed in which a recess is formed on the side and front and back through holes that connect both recesses are formed.
This resin base material is set in another mold, the synthetic rubber material is injected under pressure toward the recess on the back side, and both recesses and the front and back through holes are filled with the synthetic rubber material for manufacture.

[0004]

By the way, the synthetic rubber material used for the toothbrush is much more expensive than the synthetic resin material, and the portion actually functioning as the slip is part of the non-slip portion. Therefore, it is not economical to form the non-slip portion on the entire surface of the handle base as described above.

Further, in order to prevent the generation of burrs and the like due to the injection pressure, it is necessary to set the thickness of the non-slip portion to be relatively large in order to fill the recess and the front and back through holes with the synthetic rubber material without excess or deficiency. However, the thickness of the handle part is set in consideration of the operability of the toothbrush, and since it cannot be made too thick, it is necessary to reduce the thickness of the handle base as a core material to cope with it. There is also a problem that the strength and rigidity of the handle portion are reduced and the operability of the toothbrush is reduced. Furthermore, at toothbrush manufacturing plants, etc., the toothbrush is slid horizontally on a transfer path having a side wall so that the bristles face upward, but at this time, the non-slip part on the back side is transferred. There is also a problem that it is difficult to transfer by sliding on the surface and it becomes dirty.

The object of the present invention is to reduce the manufacturing cost of the toothbrush and to increase the strength and rigidity of the handle portion against bending while minimizing the amount of synthetic rubber used while sufficiently ensuring the anti-slip effect. And to provide a toothbrush that can improve the operability of the toothbrush.

[0007]

A toothbrush according to claim 1 is a toothbrush having a bristle implant base, a neck portion and a handle portion, the handle portion comprising a handle base made of a synthetic resin material and a synthetic rubber material. And a front-side recess and a back-side recess are formed in the vicinity of the front end of the handle base on the neck side of the handle base, and front and back through holes communicating the both recesses are formed, and the neck of the handle base is An annular recess is formed in the vicinity of the base end on the opposite side, and a communication passage that connects at least one of the front recess and the back recess to the annular recess is provided in the middle of the handle base. A synthetic rubber material is filled over the holes, the back side recesses, and the front side recesses to form a rubber portion, and the surface of the handle base is formed by the synthetic rubber material filled in the front side recesses, the back side recesses, and the annular recesses. Smooth without any steps Front anti-slip part and the back-side anti-slip portion formed of a is obtained by forming an annular anti-slip portion.

A toothbrush according to a second aspect of the present invention is a toothbrush having a bristle implant base, a neck portion and a handle portion, wherein the handle portion comprises a handle base made of a synthetic resin material and a rubber portion made of a synthetic rubber material. The handle base is formed with a distal annular recess in the vicinity of the tip on the neck side, and the handle base is formed with a proximal annular recess in the vicinity of the base on the side opposite the neck. A communication passage that connects both annular recesses is provided in the middle of the base, and a synthetic rubber material is filled into the both annular recesses and the communication passage to form a rubber portion. A front end side anti-slip part and a base end side anti-slip part whose surfaces are smoothly connected to the surface of the handle base with substantially no step are formed of a rubber material.

Here, in a state where the toothbrush is placed on a horizontal table, the non-slip portion is configured not to contact the upper surface of the table, or the communication passage is formed on the back side of the handle base, It is preferable that the cross section of the handle portion is formed in a circular shape, an elliptical shape, or an oval shape, and front and back through holes that connect the front side and the back side of the annular recess are formed in a portion of the handle base corresponding to the annular recess. Here is an example.

[0010]

In the toothbrush according to the first aspect, the front side recess and the back side recess formed in the vicinity of the front end on the neck side of the handle base, the front and back through holes communicating the both recesses, and the neck of the handle base are provided. A rubber portion is formed by filling a synthetic resin material into the annular recess formed in the vicinity of the base end on the opposite side and the communication passage communicating at least one of the front side recess and the back side recess with the annular recess. The synthetic rubber material filled in the concave portion and the annular concave portion forms a front anti-slip portion, a back anti-slip portion, and an annular anti-slip portion, the surfaces of which are smoothly continuous with the surface of the handle base without any step.

Since the non-slip portion is arranged in this way,
When gripping the handle with the palm grip, the thumb is placed on the front anti-slip or back anti-slip, the index finger is placed on the back anti-slip or front anti-slip, and the little finger and ring finger are placed on the annular anti-slip. When the handle part is gripped with the pen grip, the thumb, forefinger and middle finger are arranged on the front side anti-slip part and the back side anti-slip part, and the base part of the thumb and forefinger is arranged on the annular anti-slip part. As a result, it is possible to effectively prevent the handle portion from slipping while making the anti-slip portion as small as possible. Moreover, the middle part of the handle is
The handle base is provided with a communication passage, and the rubber portion is filled in the communication passage. Since the proportion of the synthetic resin portion is increased, the strength and rigidity of the handle portion can be increased.

In the toothbrush according to the second aspect, the distal end side annular recess formed in the vicinity of the tip of the handle base on the neck side and the vicinity of the base end on the side opposite to the neck of the handle base are formed. A rubber portion is formed by filling a synthetic resin material in the proximal-side annular recess and the communication passage that communicates both annular recesses, and the surface is formed by the synthetic rubber material filled in the distal-side annular recess and the proximal-side annular recess. A front end side non-slip portion and a base end side non-slip portion are formed on the surface of the handle base so as to be smoothly connected without any step. Therefore, like the toothbrush according to claim 1,
It is possible to effectively prevent the handle portion from slipping while making the anti-slip portion as small as possible, and it is also possible to enhance the strength and rigidity of the handle portion. In addition, since the tip-side non-slip portion is formed in an annular shape, it is possible to reliably grip the handle portion without being affected by the orientation of the toothbrush (the orientation of the hair bundle).

Here, when the toothbrush is placed on a horizontal table so that the non-slip portion does not come into contact with the upper surface of the table, the non-slip portion is transferred when the toothbrush is transferred in a horizontal posture. Can be prevented from contacting the transfer surface. Further, when the communication passage is formed on the back surface side of the handle base, the appearance of the toothbrush can be improved as compared with the case where the communication passage is formed on the front surface side. Furthermore, if the cross section of the handle portion is formed into a circular shape, an elliptical shape, or an oval shape, the handle portion can be reliably gripped without being affected by the orientation of the toothbrush (the orientation of the hair bundle).

Furthermore, by forming front and back through holes that connect the front side and the back side of the annular recess in the portion of the handle base corresponding to the annular recess, when filling the handle base with the synthetic rubber material, the annular base is formed. The rubber material can smoothly enter the front side and the back side of the recess, and the defective filling of the rubber material can be effectively prevented.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, the toothbrush 1
Is a resin base material 5 including a handle base 2, a neck portion 3, and a hair transplant base 4 which are integrally molded with a synthetic resin material, and a synthetic rubber material rubber portion 7 integrally formed on the handle base 2. The toothbrush body 6 is composed of a toothbrush body 6 and the bristle bundles 8 planted on the bristle implantation table 4 of the toothbrush body 6, and the handle portion 9 of the toothbrush 1 is composed of a handle base 2 and a rubber portion 7.

Examples of the resin substrate 5 include polypropylene, polyethylene, polyethylene terephthalate, polybutylene terephthalate, polycarbonate,
It is possible to use hard synthetic resin materials such as polyoxymethylene, styrene-acrylonitrile resin, acrylonitrile-butadiene-styrene resin, cellulose propionate, polyamide, polymethylmethacrylate, and polyarylate.

As the rubber portion 7, a polystyrene-based thermoplastic elastomer, a polyolefin-based thermoplastic elastomer, a polyurethane-based thermoplastic elastomer,
Polyester-based thermoplastic elastomer, polyamide-based thermoplastic elastomer, 1,2-polybutadiene-based thermoplastic elastomer, ethylene-vinyl acetate-based thermoplastic elastomer, polyvinyl chloride-based thermoplastic elastomer, natural rubber-based thermoplastic elastomer, fluororubber-based heat It is possible to use a rubber material such as a thermoplastic elastomer, a trans-polyisoprene thermoplastic elastomer, or a chlorinated polyethylene thermoplastic elastomer. In consideration of the adhesiveness between the resin base material 5 and the rubber portion 7, it is preferable to use polypropylene and a polyolefin-based thermoplastic elastomer having excellent compatibility. Furthermore, as the thermoplastic polyolefin-based elastomer, the soft phase is EPDM.
(Ethylene-propylene-diene terpolymer), the hard phase is most preferably made of polypropyne.

The flocking table 4 of the toothbrush 1 is formed in a flat and tapered egg shape, and a plurality of flocking holes 10 are formed in a predetermined array in the front half of the flocking table 4, and three flocking holes on the tip side are formed. The flock holes 10 </ b> A have a larger diameter than the other flock holes 10. By thus configuring the flocking table 4 to be tapered, brushing of the back side of the back teeth and the like becomes easy. Further, the three bristle holes 10A on the tip end side are configured to have a large diameter, so that the number of filaments to be planted is increased and the brushing pressure is increased while preventing the flocking table 4 from cracking. However, instead of the flocking table 4, a generally rectangular flocking table may be provided.

The handle base 2 will be described below.
As shown in FIGS. 3 to 7, a front concave portion 11 is formed on the front side (planting side of the hair bundle 8) near the tip of the handle base 2, and a back concave portion 12 is formed on the back side. 11, 1
2 is formed in the shape of a water drop that tapers toward the base end side, and is communicated with the elongated front and back through holes 13. An annular recess 14 is formed in the outer peripheral portion of the handle base 2 near the base end. Is formed with a front and back through hole 16 that communicates the front side and the back side with each other, and a part of the front and back through hole 16 is closed on the front surface side of the annular recess 14 to indicate a product name or the like ("D" in the drawing).
o ”) 17 is formed in a protruding shape, and the back side of the handle base 2 communicates with the back recess 12 and the annular recess 14.
5 is formed. Reference numeral 18 is a through hole for hooking the toothbrush 1 on a hook or the like.

With respect to the rubber portion 7, while the handle base 2 is set in a mold (not shown), a molten rubber material is pressure-injected into the annular recess 14 from the back side to form the annular recess 14 and the front and back through holes 16. By filling the communication passage 15, the front-side concave portion 11, the front-and-back through hole 13, and the rear-side concave portion 12 with a rubber material and solidifying,
It is provided integrally with the handle base 2, and
As shown in FIG. 6, a synthetic rubber material filled in the front concave portion 11, the rear concave portion 12, and the annular concave portion 14 makes the front surface non-slip portion 20 and the rear surface which are smoothly connected to the surface of the handle base 2 without any step. An anti-slip part 21 and an annular anti-slip part 22 are formed. Incidentally, reference numeral 23 is a front anti-slip portion 20 and a back anti-slip portion 2
1 and the annular anti-slip part 22 are anti-slip protrusions formed in a protruding shape.

The parts other than the front and back through holes 13 of the front side anti-slip part 20 and the back side anti-slip part 21, the parts other than the front and back through holes 16 of the annular anti-slip part 22, and the rubber part 7 corresponding to the communication passage 15. The thickness is within the range of 1 to 2.5 mm, preferably 1.5 to
It is set to about 2.2 mm and is configured to prevent the defective filling of the molten rubber material while minimizing the amount of the synthetic rubber material used.

The handle portion 9 composed of the handle base 2 and the rubber portion 7 is formed in a moderately curved shape with an intermediate portion thereof protruding to the front side, and a triangular shape is provided on the back side of the tip portion of the handle base 2. A projecting portion 30 having a shape is formed so that the back side non-slip portion 21 and the annular non-slip portion 22 do not contact the upper surface of the table when the toothbrush 1 is placed on a horizontal table.

Next, the operation of the toothbrush 1 will be described. Like the conventional toothbrush 1, this toothbrush 1 also holds the handle portion 9 by holding it with a palm grip or pen grip, and brushes it. However, when the handle portion 9 is held by the palm grip, As shown in FIG. 8, the thumb is placed on the front side anti-slip portion 20 or the back side anti-slip portion 21, the middle part of the index finger 7 is placed on the back side anti-slip portion 21 or the front side anti-slip portion 20, and the little finger and the ring finger are circular anti-slip. Part 22
Will be placed on the handle part 9 with the pen grip.
When the user grips, the thumb, forefinger and middle finger are arranged on the front anti-slip portion 20 and the back anti-slip portion 21, and the base portion of the thumb and forefinger is the annular anti-slip portion 22, as shown in FIG.
Therefore, it is possible to effectively prevent the handle portion 9 from slipping while configuring the anti-slip portions 20, 21, and 22 as small as possible.

Then, as described above, the non-slip portions 20, 21,
Since 22 is formed only in a necessary portion, the manufacturing cost of the toothbrush 1 can be reduced by lowering the ratio of the synthetic rubber material used for one toothbrush body 6, and as shown in FIG. By reducing the proportion of the rubber portion 7 in the middle of the handle portion 9, the strength and rigidity of the handle portion 9 can be increased, and the operability of the toothbrush 1 can be improved.

Further, since it is possible to reduce the amount of the synthetic rubber material having a gentle temperature decrease, it is possible to shorten the molding time of the toothbrush body 6. Moreover, since the front and back through holes 16 that connect the front side and the back side of the annular recess 14 are formed in the portion of the handle base 2 corresponding to the annular recess 14, the resin base material 5 is filled with the synthetic rubber material. Then, when the rubber portion 7 is formed, it is possible to smoothly wrap the rubber material around the front side of the annular recess 14, and effectively prevent the filling failure of the rubber material.

Further, the handle portion 9 is curved, and a protrusion 30 is formed on the back side of the handle portion 9 in the vicinity of the front end thereof. With the toothbrush 1 placed on a horizontal table, the back side anti-slip portion 21 is formed. Since the annular non-slip portion 22 does not come into contact with the upper surface of the table, the non-slip portion 2 is moved when the toothbrush 1 is transferred in a horizontal posture in the manufacturing line of the toothbrush 1.
It is possible to prevent the contacts 1 and 22 from coming into contact with the transfer surface, and prevent the transfer from becoming difficult and the non-slip portions 21 and 22 from becoming dirty.

Furthermore, since the communication passage 15 is formed on the back surface side of the handle base 2, the appearance of the toothbrush 1 can be improved as compared with the case where the communication passage 15 is formed on the front surface side.
In addition, since the handle portion 9 has an oval cross section, the handle portion 9 can be reliably gripped without being affected by the orientation of the toothbrush 1 (the orientation of the bristles 8).

Next, a panel test conducted on the toothbrush 1 will be described. As a comparative product, a toothbrush having the same shape and size as the product of the present invention, in which the non-slip portions of the same thickness were formed on the entire front side and the back side of the handle base was used. Further, the ratio of the synthetic rubber material of the present invention to the toothbrush body was set to 22% by weight, and the ratio of the synthetic rubber material of the comparative product was set to 36% by weight. The present product and the comparative product were used by gripping them with a palm grip and a pen grip, respectively, and 100 panelists conducted a panel test on the ease of holding the handle, the anti-slip effect of the handle, and the ease of brushing. The results shown in Table 2 were obtained.

[0029]

[Table 1]

[0030]

[Table 2]

From the test results shown in Tables 1 and 2, the product of the present invention is slightly worse in anti-slip effect of the handle portion than the comparative product, but the rubber portion is reduced, so that the handle portion is easy to hold. , Which is superior to the comparative product, and the strength and rigidity of the handle part are higher,
It is easy to brush and it can be seen that this product is superior overall. In addition, since the ratio of the synthetic rubber material is reduced in the product of the present invention, it is possible to significantly reduce the manufacturing cost as compared with the comparative product.

Incidentally, the front side concave portion 11 and the back side concave portion 12 are omitted, and an annular concave portion is formed in the outer peripheral portion of the handle base 2 in the vicinity of the tip end in the same manner as the proximal end portion, and the handle base corresponding to the annular concave portion is formed. It is also possible to form front and back through holes that connect the front side and the back side of the annular recess to the base portion, and connect the annular recess and the annular recess 14 on the base end side of the handle base 2 with a communication passage 15. Further, in this embodiment, one communication passage 15 is provided, but two or more communication passages 15 may be provided.

[0033]

According to the toothbrush according to the first aspect of the present invention, since the non-slip portions are formed only in the necessary portions in the vicinity of the distal end and the proximal end of the handle portion, slipping of the handle portion is surely prevented. At the same time, it is possible to reduce the manufacturing cost of the toothbrush by minimizing the amount of the synthetic rubber material used. Further, by increasing the proportion of the handle base portion in the middle of the handle portion, the strength and rigidity of the handle portion can be increased and the operability of the toothbrush can be improved.

According to the toothbrush according to the second aspect, similarly to the first aspect, the amount of the synthetic rubber material used can be minimized and the manufacturing cost of the toothbrush can be reduced while reliably preventing the handle portion from slipping. By increasing the ratio of the handle base part in the middle part of the handle part, the strength and rigidity of the handle part can be increased, the operability of the toothbrush can be improved, and the tip side slippage can be prevented. Since the portion is formed in an annular shape, the handle portion can be reliably gripped without being influenced by the direction of the toothbrush (the direction of the bristles), and the operability of the toothbrush can be improved.

According to the toothbrush according to the third aspect, when the toothbrush is transferred in the horizontal posture, it is possible to prevent the non-slip portion from coming into contact with the transfer surface, so that the transfer can be performed smoothly and the non-slip is prevented. It can prevent stains on the parts. According to the toothbrush according to the fourth aspect, since the communication passage is formed on the back surface side of the handle base, the appearance of the toothbrush can be improved as compared with the case where it is formed on the front surface side.

According to the toothbrush of the fifth aspect, since the handle portion has a circular or elliptical or oval cross section, the handle portion is not affected by the orientation of the toothbrush (the orientation of the hair bundle). It is possible to hold it securely,
The operability of the toothbrush can be further improved. According to the toothbrush according to claim 6, the front and back through holes that connect the front side and the back side of the annular recess are formed in the portion of the handle base corresponding to the annular recess, so that the rubber material on the front side and the back side of the annular recess is formed. Smoothly wraps around, and can effectively prevent defective filling of rubber material.

[Brief description of drawings]

1A is a front view of a toothbrush, and FIG. 1B is a side view of the same.

[Figure 2] Rear view of toothbrush

FIG. 3 is a vertical sectional view of a toothbrush.

FIG. 4 is a sectional view taken along line IV-IV of FIG.

FIG. 5 is a sectional view taken along line VV of FIG.

FIG. 6 is a sectional view taken along line VI-VI of FIG.

7A is a front view of a resin base material, and FIG. 7B is a rear view of the same.

FIG. 8 is an explanatory view of a palm grip.

FIG. 9 is an explanatory diagram of a pen grip.

[Explanation of symbols]

 1 Toothbrush 2 Handle base 3 Neck part 4 Flocking base 5 Resin base material 6 Toothbrush body 7 Rubber part 8 Hair bundle 9 Handle part 10 Flocking hole 10A Flocking hole 11 Front side recessed part 12 Backside recessed part 13 Backside through hole 14 Annular recessed part 15 Communication path 16 Front and back through holes 17 Characters 18 Through holes 20 Front side non-slip portion 21 Back side non-slip portion 22 Annular non-slip portion 23 Projection portion 30 Projection portion

Claims (6)

[Claims] 1. A toothbrush having a flocking table, a neck section, and a handle section, wherein the handle section is composed of a handle base made of a synthetic resin material and a rubber section made of a synthetic rubber material. A front recess and a back recess are formed in the vicinity of the tip on the neck side, and front and back through holes that connect both recesses are formed, and an annular recess is formed in the vicinity of the base end on the side opposite to the neck of the handle base. Provided in the middle of the handle base is a communication passage that communicates at least one of the front side recess and the back side recess with the annular recess, and the annular recess, the communication passage, the front and back through holes, the back side recess, and the front side recess. Fill the synthetic rubber material to form the rubber part,
A front anti-slip part, a back anti-slip part, and an annular anti-slip part whose surface is smoothly connected to the surface of the handle base with substantially no step by the synthetic rubber material filled in the front recess, the back recess, and the annular recess are formed. A toothbrush characterized by that. 2. A toothbrush having a flocking table, a neck section and a handle section, wherein the handle section is composed of a handle base made of a synthetic resin material and a rubber section made of a synthetic rubber material. A front end side annular recess is formed in the vicinity of the front end of the neck side of the handle base, and a base end side annular recess is formed in the vicinity of the base end on the side opposite to the neck side of the handle base, and in the middle of the handle base. A communication passage is provided that communicates the two annular recesses, a synthetic rubber material is filled into the annular recess and the communication passage to form a rubber portion, and the surface is made of a synthetic rubber material filled in the annular recesses. A toothbrush characterized in that a front end side non-slip portion and a base end side non-slip portion are formed on the surface of a base so as to be smoothly connected without any step. 3. The toothbrush according to claim 1, wherein the non-slip portion is configured not to contact the upper surface of the table when the toothbrush is placed on a horizontal table. 4. The toothbrush according to claim 1, wherein the communication passage is formed on the back surface side of the handle base. 5. The toothbrush according to claim 1, wherein a cross section of the handle portion is formed in a circular shape, an elliptical shape, or an oval shape. 6. The front and back through holes that connect the front side and the back side of the annular recess are formed in a portion of the handle base corresponding to the annular recess, and the front and back through holes are formed. Toothbrush.