JP2804992B2 - Toothbrush main body and secondary molding device thereof - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a toothbrush main body constituting a part of a toothbrush having a buffering function provided by a buffer member provided at a tip thereof, and a secondary forming apparatus therefor. The present invention relates to a toothbrush main body capable of easily and firmly attaching a buffer member made of an elastic material completely different from the toothbrush main body to the rear surface of the front end of the main body, and a secondary forming device for the toothbrush main body suitable for mass production of toothbrushes. It is.

[0002]

2. Description of the Related Art Conventionally, a toothbrush body having various shapes such as a rod-like body or a hexagonal pillar body and formed entirely of a hard material with a handle on a lower end side, and a toothbrush body implanted on an upper surface of a tip end of the body. A toothbrush having a large number of bundled bristles is well known, but such a hard toothbrush has a problem that if it comes into strong contact with the gums or the periphery thereof at the time of use, there is a problem of damaging the oral cavity, which is preferable for oral hygiene. Not.

Therefore, a thick soft elastic material is provided on the upper surface of the brush implant base at the tip of the toothbrush body, and the root of the brush bristles is implanted in the soft elastic material.
No. 6926), and a brush in which cushion rubber is fixed to the periphery of a brush fixed to the toothbrush body (Japanese Utility Model Laid-Open No. 57-148332) has been proposed .

[0004]

However, Japanese Patent Laid-Open Publication No. Hei 4-6926 describes that a buffering action is obtained between the brush body and the hairs implanted in the brush body. There is no mention of providing elasticity to the toothbrush body itself. In addition, the above-mentioned Japanese national development 57-148
No. 332 does not mention a specific means for fixing the cushion rubber to the periphery of the brush. For this reason, even if the cushion rubber and the toothbrush main body are bonded with an adhesive or the like, when the toothbrush is inserted into the oral cavity, it is unclear about the hygiene or the strength of the adhesion between the cushion rubber and the toothbrush main body.

[0005]

[0006] The present invention relates to Korean Utility Model Registration Application No. 93-
No. 15016, the buffer member fastening projection is inserted into a hole formed in the toothbrush body, and a plurality of projections are formed on the bottom portion of the toothbrush body to provide a heat fusion area as large as possible. The present invention provides a toothbrush body capable of easily fusing a cushioning material, and a secondary molding apparatus capable of easily mass-producing the same, in which a strong coupling is made possible by the locking action of the toothbrush, and in particular, mass production by injection molding is made possible. In addition, an object of the present invention is to provide a toothbrush body capable of more strongly fusing the cushioning member.

[0007]

In order to achieve such an object, a toothbrush body according to claim 1 has a plurality of surfaces on a surface thereof .
A head MoShokuno portion is provided with bristles insertion hole, and the handle is configured and these head and the handle and a connecting portion for connecting together, it can be coupled together buffer member on the back side of the head The toothbrush body, the head end of the head
Connection through the thickness direction from the front side to the back side
While forming a hole, forming irregularities on the back of the head,
Left and right side ends in the region near the base end on the back side of the head
Protrude outward from the left and right sides of the head and
A convex body protruding from the surface in the thickness direction is provided.
The protrusion size in the thickness direction is the protrusion size of the protrusion of the unevenness on the back surface.
While the tip on the back of the head
To the proximal end, above the left and right sides of the head
The area excluding the area where the convex body is provided and the left and right side surfaces
Between the tip of the head and the elastic material
The pressing members are joined by secondary injection molding .

[0008] The toothbrush body according to the second aspect is the first aspect.
In the configuration of the above, the unevenness on the back surface of the head has a plurality of protrusions
Formed by random distribution and to the left of the head
In the area other than the area where the convex body is provided on the right side surface,
Forming multiple protrusions with small protrusions outward from the convex body
And the convex body has a thickness of the head from the back surface.
Formed as a two-step convex body with different protrusion dimensions
And the thickness direction of the convex body on the base end side of the head.
The size of the protrusion is larger .

According to a third aspect of the present invention, there is provided a secondary molding apparatus for a toothbrush body, wherein an injection nozzle is connected to a fixed mold plate of an injection mold, and a synthetic resin material heated and melted is injected from the injection nozzle. After filling the cavity containing the toothbrush body through the sprue, the runner and the gate of the fixed mold and cooling, the movable mold is separated from the fixed mold and a predetermined secondary injection molded product is separated. Toothbrush body 2 to mold
In the next molding apparatus, a backup plate is interposed between the fixed-side stationary plate and the fixed-side template so that the plurality of second sprues correspond to the gate holes of the plurality of cavities,
A gate communicated with the second sprue is formed in the upper cavity of the fixed mold plate at the entrance side of the small width portion of the upper cavity, and two locking projections are formed so as to protrude. In the center of the core plate, which is in close contact with the boundary line, a lower cavity with a small width part and a large part with the same width as the upper cavity was formed, and a concave bottom with mirror finish was formed on the bottom side of the large part. Things.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is an exploded perspective view of an injection molding die 14 and a perspective view of a main part thereof, FIG. 2 is a perspective view of a fixed mold plate 3 of the injection molding die 14, and FIG.
4A to 6 are explanatory views of the side view of the injection molding die 14, FIG. 7 is a cross-sectional view of the injection molding die 14 and a cross-sectional view of main parts thereof, and FIG. FIG. 3 is a schematic view of a next molding device 15. FIG. 9 is a perspective view of the toothbrush main body 20 according to the present embodiment, and FIGS. 10 to 12 show details of the head 17 of the toothbrush main body 20.

FIG. 13 is an exploded perspective view of the head 17 of the toothbrush 16 manufactured and completed by the secondary molding device 15 according to the present embodiment. The manufacturing process of the toothbrush 16 by the secondary molding device 15 is the same as that of FIG. In summary in light of the diagram,
It is characterized in that a foreign material is fused to the back surface of the head 17 of the toothbrush main body 20 obtained by primary injection molding by secondary injection molding. In particular, the cushioning member 21 made of an elastic material is firmly attached to the toothbrush main body 20. To adhere to

The toothbrush body 20 according to the present embodiment 2
As shown in FIGS. 7 (a), 7 (b) and 8, the second molding device 15 includes a plurality of second sprues 5 and a plurality of cavities 6 between the fixed stationary plate 1 and the fixed mold plate 3. To respond to
As shown in FIG. 2, a runner 3a is formed on the outer surface of the fixed mold plate 3 with the backup plate 2 interposed therebetween, and an upper cavity 6a formed on the inner surface of the fixed mold plate 3 has:
As shown in FIGS. 1B and 3, the gate 7 connected to the second sprue 5 is connected to the small width portion 6 of the upper cavity 6a.
a 'on the inlet side and two locking projections 6c
Are formed so as to protrude, and further, the movable-side template 4 that is in close contact with the fixed-side template 3 at the parting line 8 as a boundary,
Core plate 4 with lower cavity 6b formed in the center
a is embedded.

As shown in FIG. 7B, the upper cavity 6a and the lower cavity 6b are opposed to each other when the fixed mold plate 3 and the movable mold plate 4 are in close contact with each other. It is the space formed between. Also, the moving side template 4
As shown in FIGS. 1 (a) and 1 (c), the lower cavity 6b has a small width portion 6b 'having an outer shape substantially equal to that of the upper cavity 6a of the fixed mold plate 3, and a concave bottom surface 9 having a mirror finish. And a large portion 6b ″.

As shown in FIG. 9, the toothbrush body 20 has a plurality of bristle insertion holes on the surface of which the bristles are implanted.
A head 17 which MoShokuno unit 23 is provided for, the handle 18
When, and these head 17 and the handle 18 is composed of a connecting portion 19 for integrally connecting, buffering on the back side of the head 17 member 2
1 Ru Der those capable of binding together. As shown in FIG. 10 to FIG. 12, the head 17
Connection through the thickness direction from the front side to the back side
A hole 22 is formed. On the back surface 24 of the head 17,
Form irregularities by randomly distributing projections 24a
And the left and right side surfaces 2 of the region of the head 17 near the tip portion 25
A plurality of projections 26'a, 27'a are projected from 6 ', 27'.
doing. Then, the region from the base end 17a of the head 17
The left and right side edges 26, 27 of the
The convex body 26 whose projecting dimension in the direction is larger than the projection 24a.
a, 27a (sidewall portions). The convex body 26a,
27a extends outward from the left and right side surfaces 26 ', 27'.
The protrusion dimension to the outside is the protrusion 26 '.
a, 27'a are larger than the projecting dimension.

The primary injection molding performed to manufacture the toothbrush body 20 is a well-known technique, and therefore illustration is omitted. After filling into the cavity through the sprue, runner and gate of the template, cooling and curing it,
This is a series of steps of separating the movable mold plate from the fixed mold plate, opening the injection mold, and releasing a predetermined injection molded product.

[0016] The convex bodies 26a and 27a is a head 17
Need not be provided over the entire area in the longitudinal direction of the back surface 24 of FIG.
1, the buffer member coupling hole 22 is located near the center in the longitudinal direction on the back surface of the head 17.
It may be a partial one that extends to near the base end 17a of the head 17 .

Hereinafter, a manufacturing process of the toothbrush 16 using the forming apparatus according to the embodiment of the present invention will be described. First, the movable mold plate 4 is separated from the fixed mold plate 3 of the injection mold 14, the mold 14 is opened as shown in FIG. 4, and the mold 14 already manufactured by primary injection molding is opened. As shown in FIG. 7 (b), the substantially rear half of the toothbrush body 20 is pushed into the upper cavity 6a of the fixed mold plate 3 to be immersed. At this time, the large portion 6 of the upper cavity 6a
a "is fitted into the bristle insertion hole 30 of the toothbrush main body 20, and the toothbrush main body 20
From the upper cavity 6a.
Then, the movable plate 1 ', the movable mold plate 4, the fixed mold plate 3, and the backup plate 2 are extended by extending a high-pressure cylinder (not shown) provided outside the movable plate 1' to the fixed stationary plate 1 side. 5 and FIG. 7 (b), the toothbrush body 20 is housed in the cavity 6, as shown in FIGS.

If the secondary injection molding is performed in this state, the buffer member 21 can be fused to the back surface of the head 17 of the toothbrush main body 20, as shown in FIGS. More specifically, a spool bush 1 provided with an injection nozzle 10 of a general-purpose injection molding machine as shown in FIG.
1 by driving a motor 43 connected to the screw 42 of the injection molding machine via a reduction gear 41 and rotating the screw 42, thereby forming a powdery or bead-like material flowing down from the hopper 40. The raw material of the buffer member 21 made of synthetic resin is conveyed while being compressed to the front of the injection nozzle 10, and is simultaneously heated and melted by the heating plate 47 attached to the outer peripheral surface of the injection nozzle 10.

Next, the injection cylinder 44 connected to the rear part of the screw 42 is extended, and the raw material (hereinafter, molten resin 45) of the buffer member 21 which has been heated and melted into a syrup is extended.
Is injected from the tip of the injection nozzle 10 and passes through the sprue 11a of the sprue bush 11, and as shown in FIGS. 7 (a) and 7 (b), the runner 3a of the fixed side mold plate 3 and the second sprue 5
And through the gate 7, and further through the buffer member coupling hole 22 provided through the toothbrush main body 20, to flow into the space between the uneven surface 24 of the toothbrush main body 20 and the bottom surface 9 of the lower cavity 6b. . Thereby, the molten resin 45
Is cushioned from the tip 25 on the back 24 of the head 17.
The region covering the base end portion 17a where the member coupling hole 22 is located is covered, and the region where the convex bodies 26a and 27a are provided is removed.
Excluding left and right side surfaces 26 ', 27' and these left and right side surfaces 2
It is filled in a state surrounding the end face between 6 'and 27' .

At this time, the toothbrush body 20
The molten resin 45 flowing into the space between the back surface 24 having the irregularities on the head 17 and the bottom surface 9 of the lower cavity 6b is
Immediately after passing through the gate 7, high-speed turbulence tends to spread, but partial ridges 2 along both sides of the back surface 24 are formed.
6a and 26b rectify the molten resin 45 and serve as a guide for guiding the molten resin 45 to the front end portion 25 side of the back surface 24 to prevent the occurrence of weld lines and the like.
Can be prevented from leaking from a slight gap between the head 17 of the toothbrush body 20 and the lower cavity 6b, and the occurrence of burrs and the like can be prevented.

Further, when the molten resin 45 cools and hardens after a predetermined time, the molten resin 45 becomes an elastic material,
As shown in FIG. 4, the molten resin 45 staying in the buffer member connection hole 22 of the buffer member 21 becomes the buffer member fastening protrusion 28 that is fused in the buffer member connection hole 22. in this way,
Since the buffer member fastening projection 28 is inserted into the buffer member coupling hole 22, the toothbrush body 20 and the buffer member 21 can be more strongly coupled by the locking action of the buffer member fastening projection 28.

[0022] Further, the convex bodies 26a, 27a is convex body 29a of the two-stage which Chigae the height in the thickness direction of the head 17, and 29b
Because it is formed by, the first stage of the convex body 29a is guiding an upper stage 21a of the cushioning member 21, the second-stage convex
Fusion Chakusuru because the body 29b is lower stages 21b, left and right side walls 26
a, the surface area of 27a becomes wide, the molten resin 45 is convex body 26a that flows from the gate 7, so stably be fused to 27a, these convex member 26a, the buffer member 21 from 27a easily peeled Never do. In addition, large part 6
Since the bottom surface 9 of the b "is concave, the buffer member 21 protrudes central bottom curved, and since mirror finish is applied to the bottom surface 9, the buffer member 21 is provided MoShokuno 23
The back surface 21c opposite to the front surface of the head 17 becomes a smooth surface having a mirror-like gloss.

Subsequently, when the moving plate 1 'is retracted by contracting the high-pressure cylinder, as shown in FIG.
At the same time, the movable mold plate 4, the fixed mold plate 3, and the backup plate 2 are retracted. In this process, sprue 11a,
Since the molten resin 45 staying in the runner 3a and the second sprue 5 and the molten resin 45 filled in the cavity 6 and serving as the buffer member 21 are hardened as they are and are continuously integrated, The backup plate 2 retreats together with the movable mold plate 4. When the backup plate 2 moves to the movable plate 1 ′ to some extent, the backup plate 2 is hooked on the enlarged end portion 12 a of the stop load 12.

For this reason, only the backup plate 2 stops halfway, and the fixed mold plate 3 is
Therefore, the molten resin 45 hardened while remaining in the sprue 11 a, the runner 3 a and the second sprue 5 and the molten resin 45 hardened in the cavity 6 to form the buffer member 21 are the thinnest. It is cut by a gate 7 having a large diameter. As a result, the molten resin 45 hardened while remaining in the sprue 11a, the runner 3a, and the second sprue 5 adheres to the backup plate 2 and is left. Further, when the movable mold plate 4 moves back together with the movable plate 1 ', the fixed mold plate 3 and the movable mold plate 4 separate as shown in FIG.

At this point, since the two locking projections 6c are fitted into the bristle insertion holes 30 of the toothbrush body 20 for the above-described reason, the toothbrush body 20 and the buffer member 21 do not separate from the movable mold plate 3. Then, only the movable mold plate 4 separates from the fixed mold plate 3. When the toothbrush body 20 and the cushioning member 21 are released from the upper cavity 6a of the fixed mold plate 3, the cushioning member 21 can be closely attached to the toothbrush body 20, as shown in FIGS. Finally, the toothbrush 16 is transferred to an unillustrated flocking machine, and the bristles 46 are implanted in the bristle insertion holes 30 as shown in FIG. 13 to complete the toothbrush 16 as a final product.

On the other hand, the molten resin 45 hardened while remaining in the sprue 11a, the runner 3a and the second sprue 5
Is that the backup plate 2 is also slightly moved toward the movable mold plate 3 while the movable mold plate 4 is retreating, so that the backup plate 2 is separated from the inner peripheral surface of the sprue 11a and easily separated from the backup plate 2 and the sprue bush 11. You are ready to type. Therefore, the molten resin 45 hardened while staying in the sprue 11a, the runner 3a and the second sprue 5 is formed.
Is dropped by its own weight, or is removed using an unillustrated take-out robot or the like. Then, the toothbrush body 20 obtained by the primary injection molding is stored again in the upper cavity 6a of the fixed-side mold plate 3, and the above steps are repeated. The worn toothbrush 16 can be manufactured continuously.

[0027]

According to the toothbrush body according to the first aspect,
Since the rear surface of the head that is coupled to the buffer member to form a concave convex, the buffer member is an elastic member fusion by a secondary injection molding
The thermal fusion area at the time of wearing the fusion of the toothbrush body measuring Gaité cushioning member can be made more robust. Also, toothbrush
At the left and right ends on the back side of the head of the main body,
Protrude outward from the right side, and
Forming a convex body that protrudes in the
The body is heated and melted and straightens the synthetic resin material poured from the shock absorbing member coupling hole located at the base end of the head ,
Plays a role as a guide to guide to the tip side along the back of the head to prevent the occurrence of weld lines,
Further, it is possible to prevent the molten resin from leaking from a slight gap between the toothbrush body and the lower cavity, thereby preventing occurrence of burrs and the like.

Further, since the buffer member fastening projection formed by hardening the material retained in the buffer member connecting hole is fused in a state of being fitted into the buffer member connecting hole, strong connection is achieved by the locking action of the buffer member fastening projection. For example, even if a strong impact is applied or a sudden temperature change is applied, the cushioning member does not peel off from the toothbrush body.

[0029] The toothbrush body according to the second aspect is the back of the head.
As projections are randomly distributed on the surface to form irregularities ,
The thermal fusion area fused to the toothbrush body measuring Gaité cushioning member can be made more robust. In addition, the left and right side surface of the head,
Forming a projection, the convex body, by forming a convex body in two stages with Chigae the height in the thickness direction of the head, these
Left and right side surfaces and a surface area of the convex body wide Gaité, heated molten synthetic resin material is advantageous in that Ru can stably fused to the toothbrush body.

According to the secondary apparatus for forming a toothbrush body according to the third aspect, the productivity of the toothbrush to which the buffer member is fused can be improved. That is, in order to manufacture a conventional toothbrush in which a buffer member is bonded to an existing toothbrush body via an adhesive or the like, a step of forming the buffer member and a step of joining the buffer member to the toothbrush body are required. On the other hand, when the toothbrush is manufactured using the secondary molding apparatus of the present invention, the buffer member made of an elastic synthetic resin can be injection-molded and the buffer member can be fused to the toothbrush body at the same time. Can be greatly simplified.

Also, since the concave bottom surface of the large portion of the lower cavity is transferred to the central bottom surface of the cushioning member, the central bottom surface of the cushioning member is finished as a curved protruding surface. In addition, since the concave bottom surface of the large part of the lower cavity is mirror-finished, the central bottom surface of the cushioning member is finished to a smooth surface with a mirror-like gloss, and strongly contacts the gums and skin in the oral cavity Nor does it hurt them.

[Brief description of the drawings]

FIG. 1A is an exploded perspective view of an injection molding die constituting a secondary molding apparatus according to an embodiment of the present invention, FIG. 1B is an enlarged view of one main part thereof, and FIG. The enlarged view of another principal part.

FIG. 2 is a perspective view of a fixed-side mold plate of an injection molding die included in a secondary molding apparatus according to an embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA ′ of FIG. 2;

FIG. 4 is a side view showing a state in which an injection molding die included in the secondary molding apparatus according to the embodiment of the present invention is opened.

FIG. 5 is a side view illustrating a state in which an injection molding die included in the secondary molding apparatus according to the embodiment of the present invention is clamped.

FIG. 6 is a side view illustrating a process of opening an injection molding die included in the secondary molding apparatus according to the embodiment of the present invention.

FIG. 7A is an explanatory view of a manufacturing process in a sectional view of an injection molding die constituting a secondary molding apparatus according to an embodiment of the present invention, and FIG. 7B is an enlarged view of a main part thereof.

FIG. 8 is a schematic diagram of a secondary molding device according to an embodiment of the present invention.

FIG. 9 is a perspective view of the toothbrush main body according to the embodiment of the present invention.

FIG. 10 is a surface view of the head of the toothbrush body according to the embodiment of the present invention.

FIG. 11 is a rear view of the head of the toothbrush body according to the embodiment of the present invention.

FIG. 12 is a side view of the head of the toothbrush main body according to the embodiment of the present invention.

FIG. 13 is an exploded perspective view of the head of the toothbrush.

FIG. 14 is a side view of the head of the toothbrush main body to which the cushioning member is attached.

FIG. 15 is a perspective view of the head of the toothbrush main body to which a buffer member is attached.

FIG. 16 is a front view of the head of the toothbrush main body to which a buffer member is attached.

FIG. 17 is a rear view of the head of the toothbrush main body to which the cushioning member is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fixed-side stationary plate 1 'Moving plate 2 Backup plate 3 Fixed-side mold plate 3a Runner 4 Moving-side mold plate 4a Core plate 5 Second sprue 6 Cavity 6a Upper cavity 6a' Small width portion 6a "Large portion 6b Lower cavity 6b 'Small width Part 6b ″ Large part 6c Engagement protrusion 7 Gate 8 Parting line 9 Bottom surface 14 Injection molding die 15 Secondary molding device 20 Toothbrush main body 21 Buffer member 22 Buffer member coupling hole 24 Irregular surface 24a Projection 25 Front end 26 Front left end Part 27 Tip right side part 26 'Projection 27' Projection 26a Left side wall 26b Right side wall 28 Buffer member fastening projection 40 Hopper

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) A46B 5/00 A46D 3/04 PCI (DIALOG)

Claims (3)

(57) [Claims] 1. A hair implantation part having a plurality of hair insertion holes on its surface.
A head is provided, and the handle is composed of a connecting portion connecting with these heads and the handle together, the back surface side bondable toothbrush body cushioning member integrally with <br/> of the head In the base portion of the head, the thickness direction from the front side to the back side of the head
And forming a buffer member coupling hole penetrating the head.
Unevenness is formed on the back of the head, and the back of the head is near the base end
Outside the left and right sides of the head at the left and right side edges in the area
A protrusion that projects laterally and that projects in the thickness direction from the back of the head
And a protrusion in the thickness direction of the convex body is defined as above.
While the size of the protrusion on the back surface is larger than the protrusion size of the protrusion,
Position of the buffer member connection hole from the tip on the back of the head
In the area to the base end to be placed, on the left and right sides of the head
The area excluding the area where the convex body is provided and the left and right sides
Elastic material over the tip surface of the head between the surfaces
A toothbrush body, wherein the buffer member is joined by secondary injection molding . 2. The unevenness on the back surface of the head has a plurality of protrusions.
Formed by random distribution and left and right of the head
The convex portions are formed in an area other than the area where the convex body is provided on the side surface.
Form multiple protrusions with small protrusions outward from the body
And the convex body has a thickness of the head from the back surface.
Formed as a two-stage convex body with different projecting dimensions in the direction,
In the thickness direction of the convex body on the base end side of the head
The toothbrush body according to claim 1, wherein the protrusion dimension is made larger . 3. An injection nozzle is connected to a stationary mold plate of an injection mold, and a synthetic resin material heated and melted is injected from the injection nozzle, and the synthetic resin material is injected through a sprue, a runner and a gate of the stationary mold plate. After filling in the cavity in which the main body is stored and cooling, the movable mold plate is separated from the fixed mold plate, and a predetermined secondary injection molded product is released from the secondary molding device of the toothbrush main body. A backup plate is interposed between the side stationary plate and the fixed mold plate so that the plurality of second sprues correspond to the gate holes of the plurality of cavities. A communication gate is formed on the entrance side of the small width portion of the upper cavity, and two locking projections are formed so as to protrude. The central portion is formed a lower cavity having a narrow portion and a substantial part of the upper cavity and the same width, of the toothbrush body, characterized in that the formation of the concave bottom surface subjected to mirror finish on the bottom side of the large width portion 2
Next molding equipment.