JPWO2010143313A1 - Toothbrush that brushes across the dentition - Google Patents

Abstract

In the present invention, using the limits of the mold manufacturing technology and mechanical flocking technology that can be manufactured at present, the flocking surface engagement angle is more than conventional even when the bristle tilt angle is 10 ° to 15 °, which has been considered impossible in the industry. A toothbrush that brushes with a wide or flocked surface with one concave curved surface and a tooth row that does not have an engagement angle can be mass-produced with only an automatic machine without relying on human hands. A toothbrush capable of simultaneously polishing the meshing surface of the dentition, the lip side, and the lingual side, wherein the outer row bristles are inclined toward the center line side of the toothbrush housing, and the bristles have an inclination angle of 10 °. In this case, the angle formed by both flocked surfaces was 160 ° in the past, but according to the present invention, in the case of four-row flocking, 170 °, two slits are provided and the flocked base material is divided into three, and in the case of three-row flocking The angle can be set to 175 °, which can be closer to a flat surface.

Description

  The present invention is a toothbrush that can be used to brush the tooth surface of the dentition, the lip (front) side, and the tongue (back) side of a toothbrush that is used by a large number of people every day (hereinafter referred to as “whole periodontal toothbrush”). The toothbrush in which the outer row bristles are inclined toward the center line side of the toothbrush housing.

All periodontal toothbrushes can be broadly divided into those in which the center row of normal toothbrush bristle is short and the outer row is long, and the flocked base is divided into two or three, and each flocked surface is arranged in a single plane. The body including the head part, neck part, and grip part provided with all the flock holes perpendicular to the parting line (hereinafter referred to as “PL”) of the toothbrush body molding mold is formed by the injection molding method of a hard thermoplastic plastic. In addition, there is one in which a flocked substrate divided after flocking is bonded or welded at a desired angle.
JP 2001-346633 A Shoko 63-503276

Both of the above two examples require manpower for assembly after flocking, are costly and unsanitary, and improve the width of the flocking base material to be both 25 mm or more in terms of structure. The flocking base material is connected with a thin connecting band, arranged in one plane, provided with flocking holes vertically, and first molded with a mold connecting the gripping part and the flocking base material, and then two flocked surfaces Using a mold with an angle of 150 ° to 160 °, the slits between the flocked base materials and the gaps in the neck are made of a soft thermoplastic that is the same as or compatible with the primary molding material. There is a “toothbrush that brushes across the dentition” possessed by the present applicant, which is filled and fixed by a molding method.
Patent 4143882

The toothbrush according to Patent Document 3 was prototyped with a toothbrush width of 15 mm and an angle between the PL vertical line and the bristle of 10 °, and was used as a monitor in Japan. The width of the same flocking base material is preferably 12 mm or less, and the width of the outer bristle is tilted inward as much as possible with this width to create a row of voids in which the row of teeth fits, and the polishing rod stays It has been found that it is desirable that the engaging portions of both flocked bases be as flat as possible.
The toothbrush manufacturing method currently in use, including all periodontal toothbrushes, is made of a rigid thermoplastic injection molding method with the gripping part, neck part, and head part (flocking base part) integrated. In this case, all flock holes are formed by removing pins that form flock holes provided perpendicular to the flocked surface.
There are cases where it is desired to plant the hair at an angle with respect to the vertical line of PL, but this can only be inclined by a mold or drilled by post-processing. Drilling of tilted holes with a mold is possible up to 5 ° with the current technology, but at an angle higher than that, neither mold production nor mechanical flocking is possible. Moreover, it cannot plant in the flock hole which inclined 5 degrees or more with respect to the flock surface performed by post-processing.

In the method of Patent Document 3, when it is desired to tilt 10 ° with respect to the vertical line of PL, the angle formed by both flocked surfaces is 160 °.
In the present invention, using the fact that the angle that can be tilted with respect to the flocked surface is up to 5 °, it is possible to arrange the angle between both flocked surfaces that are preliminarily hinged and divided into two at 190 °. However, if a flock hole is provided perpendicular to the PL, the angle between the flocked surfaces when it is tilted by 10 ° with respect to the vertical line of the same PL as in the previous example is 170 °, which means that it is gained by 10 °. Is also possible.

  The toothbrush of the present invention has a structure that can be used just by looking at it, and it is difficult to remove from the dentition during use, and it can be brushed in a short time without being left unpolished. Can also be effective, and is effective in controlling bad breath, preventing and treating caries and periodontal disease.

FIG. 1 is a plan view of a flocked base material of a four-row flocked toothbrush obtained by primary molding showing an embodiment of the present invention. FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. FIG. 4 is a side view of the head when the four-row flocked toothbrush of the present invention is completed. FIG. 5 is a plan view of the flocked base material of the three-row flocked toothbrush obtained by the primary molding showing the embodiment of the present invention. 6 is a cross-sectional view taken along the line BB 'of FIG. 5. FIG. 7 is a cross-sectional view after secondary molding of the same portion as FIG. 6. FIG. 8 is a side view of the head portion when the third row flocking toothbrush of the present invention is completed. 9 is a plan view in which the flocked surface is a concave surface and the flocked hole is post-processed. FIG. 10 is an explanatory diagram in the case of mechanical drilling after molding the non-porous toothbrush housing of FIG.

1, 1 'flocked base material 2, 2' flocked surface 3, 3 'connecting band 4, 4' slit θ The angle between the vertical line of the whole flocked base material required by the present invention and the bristle θ 'after primary molding Angle between PL, parallel surface and flocked surface θ ″ Angle between parallel surface of PL after secondary molding and flocked surface PL Parting line at the time of primary molding Σ Outer row bristle with radius of concave arc flocked surface Angle of up to 5 ° that can be tilted α Spacing between outer bristle tips β Width of flocking substrate

An ordinary hand brushed toothbrush around the world has a narrow neck part that follows the gripping part, a narrowest part with a head part of 12cm length and 30mm length, and a bristle planted vertically on it. In Japan, the size of the head part is small, and even for adults, the width is about 9 to 12 mm and the length is about 18 to 25 mm. The smallest dimension in Europe and America is the largest dimension accepted in Japan. Based on this dimension, tilt the outer row of bristles as far as possible toward the center of the toothbrush housing, shorten the middle row bristles, and plant the outer bristles longer. A manufacturable form of a toothbrush that can be polished will be described in detail.
FIG. 1 shows a plan view of a flocked base material of a toothbrush obtained by primary molding of a hard thermoplastic injection molding method. FIG. 2 is a cross-sectional view taken along the line AA ′ of FIG. 1, and the flocked base materials 1, 1 ′ are divided into two by a slit 4 provided on the center line and are flexibly connected by a connecting band 3. θ ′ indicates an angle that can be perforated at an angle with respect to a vertical line of a plane parallel to the PL in the current technology, and is normally 5 ° at maximum. Each of the flocked holes 5 and 6 is provided perpendicular to the PL.
Next, as shown in FIG. 3, the angle θ ″ obtained by subtracting the angle θ ′ gained by the primary molding from the angle (θ in FIG. 4) that the angle between both flocked surfaces is desired to be finally inclined is obtained from the parallel plane of the PL. With the reduced mold, the slit 4, the neck portion, the gripping portion, and the like are secondarily molded by the same material as the first molding or by the injection molding method of a hard thermoplastic having compatibility.
Next, using a flocking machine, a filament of about 4 mil was planted in the center row flocking hole to a length of 5 to 6 mm, and the outer row flocking hole was about 7.5 mil in thickness and one end was finely processed. If the hair is implanted so that the length of the exposed portion of the filament is 12 mm and the other end is 8 mm, the entire bristle is placed in the flocked row inclined to the center side of the toothbrush housing by about 10 °. A toothbrush having a gap between the tooth rows can be obtained in mass production.
Although the four-row toothbrush has been described up to the previous stage, as shown in the drawings of FIGS. 5 to 8, the main flocking base material is provided in the center, the auxiliary flocking base material is provided on both sides, and the same method as in the case of the two flocked base materials is used. A toothbrush that is brushed across three rows of flocks is obtained. Usage, effects, etc. are the same as in the case of 4-row flocking.
In addition, when drilling a flocked hole in post-processing, a toothbrush housing without a flocked hole is made with a hard thermoplastic such as ABS that cannot be burred even by mechanical cutting such as ABS. If a predetermined flocked hole is drilled at the bottom, the same result as the above-mentioned method of forming twice is obtained.
Hereinafter, the optimum form of the manufacturing method will be exemplified. If the distance α between the tips of the outer bristles, the angle θ desired to be inclined to the inside of the outer row bristles, and the length L of the exposed portion of the bristles are determined, P in FIG. The R point is determined, the diameter of the flocked hole and the dimension from the flocked hole to the edge of the flocked base material are taken into consideration, and if not suitable, β may be changed or θ may be changed. The point P on the arc centered at the intersection O of the line with the Σ extended from θ and the center line of the figure, which is usually less than 5 °, even if it is tilted with respect to the vertical line of the planting point past the point P , Which is inclined inwardly by θ ′ from the radius centered on O, can be flocked, and the flocked surface is an arc with a small curvature with less stagnation of the polishing paddle.
Next, determine the P 'point so that it fits between both outer holes parallel to the line connecting the center P' and O of the inner flock hole or the vertical line of the whole flocked surface, and input to these NC milling machines with these lines Then, if the prepared toothbrush housing is set by a person or supplied by an automatic catching device, a toothbrush housing having the same function as the toothbrush housing molded twice described above can be obtained.

  In the present invention, using the limits of the mold manufacturing technology and mechanical flocking technology that can be manufactured at present, the flocking surface engagement angle is more than conventional even when the bristle tilt angle is 10 ° to 15 °, which has been considered impossible in the industry. A toothbrush that has a wide or flocked surface with a single concave surface and sandwiches a tooth row that does not have an engagement angle can be mass-produced only with an automatic machine without relying on human hands.

Claims (3)

In a hand-brushed toothbrush and an electric toothbrush, the flocked base material portion is divided into two in parallel to the central axis and flexibly, and the angle formed by the flocked surface between the vertical line of the parting line required at the time of completion and the bristle Of the angles formed, even if the flock hole is inclined with respect to the flocked surface, the angle θ ′ (usually set to 5 ° at the maximum) at which the mold can be manufactured and mechanical flocking can be made It is applied between the parallel surface of the proboscis line and both flocked surfaces, and all flock holes are first molded with rigid thermoplastic by injection molding method perpendicular to the parting line, and then the θ required at the time of completion Of these, the same as the primary molding material by injection molding using a mold having a flocking surface with an angle obtained by subtracting the angle θ ′ gained in the primary molding from the parallel surface of the parting line, or This is a compatible material, and the space between the flocked base materials. A toothbrush that forms a lit, a neck portion, and a gripping portion, and then polishes with a four-row flocking tooth row in which the center row is shortened and the outer row is lengthened. A toothbrush that polishes by sandwiching a tooth row of three rows of flocks manufactured in the same manner as in claim 1, wherein the flocked substrate portion is divided into three in parallel and flexibly with respect to the central axis. Like ABS, it is a hard thermoplastic that cannot be burred even if it is machine-cut. It has a length of 30 mm, a width of 10 to 15 mm and a radius of about 3 times the width. The head part, neck part, and grip part of the flock hole to be used as a surface are integrally molded by an injection molding method. Next, connect the center of the outer flock hole and the center of the flocked surface, pass the center of the flock hole from this line, and incline the appropriate angle up to about 5 ° inward as the excavation angle of the outer flock hole, Separately, a line connecting the center point of the inner flock hole and the center of the flocked surface arc, or a line parallel to the vertical line of the entire flocked base material is used as the excavation line of the inner flock hole, and drilled to the bottom with an NC milling machine, etc. A toothbrush that brushes across a row of teeth that has a shorter row and a longer outer row.

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