JPH0228744Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a toothbrush useful for brushing the backside of teeth.

(Prior art) As conventional brushes for the front and back of teeth, there is, for example, a toothbrush for top and bottom brushing proposed in Japanese Utility Model Application Publication No. 1983-56073, and a toothbrush for brushing the back of teeth proposed in Japanese Utility Model Application Publication No. 52-1989. -I have a toothbrush number 22773.

By the way, when brushing the back of the teeth, it is preferable to move the brush in an up-and-down motion, similar to the front surface of the teeth.In this respect, although both the former and the latter have been improved to make it easier to brush by moving up and down, In order to scrape out food particles, etc., there is a structural problem in that in addition to the vertical sliding operation, a pushing operation of pressing against the tooth surface is required.

In addition, the brush surface is designed to have a convex curve that follows the back side of the teeth so that the back side of the teeth can be polished relatively well. There are gaps between the teeth and dents due to the rounded cross-sectional shape of the teeth, and conventional products with a uniform convex curved brush surface tend to not polish the dents between the teeth. have.

(Problem to be solved by the invention) The problem to be solved by the invention is that food particles can be efficiently scraped out from the gaps between teeth and gums by simply sliding up and down, and To provide a toothbrush exclusively for the back of the teeth, which can evenly and effortlessly brush the entire back of the teeth including dents.

(Means for Solving the Problems) The means taken by the present invention to solve the above-mentioned problems is to form the base half of the handle into a roughly rectangular cross-section, while forming the tip half into a tip. is formed into a curved shape that is located approximately on the extension axis of the base half, and the diameter cross section is approximately circular, and the flocked part is approximately T-shaped at the tip of this front half, and the flocked surface is aligned with the extension axis of the base half. The bristles are arranged at an angle of about 40 degrees, and the bristles on the bristles are arranged in a convexly curved brush surface portion along the back side of the teeth, and in the direction of curvature of this convexly curved brush surface portion. It is characterized by a structure in which small flat brush surface portions located on both sides and bent toward the convexly curved brush surface portions are formed in a continuous manner.

(Function) At the same time as the large convex curved brush surface brushes the back side of the teeth, the small flat brush surface brushes the dents between the teeth, and the entire back side is polished evenly.

The base half has a rectangular diameter cross section and is easy to hold, while the tip half has a circular diameter cross section with no corners, making it soft to the touch and easy to move in the mouth.

The flocked surface is approximately on the extension axis of the original half.
It is slanted around 40 degrees, so that the tip half does not touch the tooth, and as the brush surface slides against the back of the teeth, it gradually bites into the gaps between the teeth and the gums. You will have to scrape out the food particles.

The bristles are located almost on an extension line of the base half, and the positional relationship of the brush surface to the back of the teeth is determined naturally by the feeling of gripping the base half.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

A in the figure is a toothbrush, and this toothbrush A has a main half 2 of a handle 1 formed into a roughly rectangular diameter cross section, and a front half 3 whose tip is positioned approximately on the extension axis a of the main half 2. It is formed into a curved shape and has a generally circular cross section, and the flocked part 4 is arranged at the tip of the front half 3 in such a manner that the flocked surface 5 has an angle of about 40 degrees with respect to the extension axis a of the base half 2. The bristles 6 on the bristle-flocking surface 5 are arranged so that the brush surface 7 of the bristle-flocking surface 5 is located on a large convex curved brush surface portion 8 along the back side of the tooth and on both sides of the convex curved brush surface portion 8 in the curved direction. A small flat brush surface portion 9 bent toward the convexly curved brush surface portion 8 is formed in a continuous manner.

The flocking part 4 is disposed in a T-shape with respect to the handle 1, and is polished by moving the handle 1 up and down.
The inclination angle of the flocked surface 5 in this flocked part 4 is about 25 to 55 degrees, preferably about 40 degrees, with respect to the extension axis a of the base half 2, so that the backs of the upper and lower teeth can be brushed without the tip half 3 touching. Moreover, the pressing force of the brush surface 7 against the back of the teeth is generated by the sliding operation of the base half.

That is, if the inclination angle of the flocked surface 5 is less than 25 degrees, the tip will easily hit the lips, etc. If it exceeds 55 degrees, by moving the handle up and down while pulling it in the direction away from the teeth, The polishing operation becomes difficult.

It is preferable that the flocked hairs 6 are arranged in three rows, one above the other, so that polishing efficiency is high.

(Effect of idea) Therefore, the present invention has the following advantages.

The large convex curved brush surface can brush the main tooth surfaces on the back side of the teeth, and the small flat brush surface can simultaneously brush the dents between the teeth that are difficult to polish with the convex curved brush surface. The entire back side can be sufficiently and evenly polished without leaving any polishing residue.

The base half, which has a rectangular diameter cross section, is easy to grip and hold, and the tip half, which has a circular diameter cross section, has no corners and is easy to move in the mouth, and is soft and comfortable.

Since the bristle-planting surface is inclined approximately 135 degrees on its extension axis with respect to the base half, the brush surface gradually moves against the back of the tooth as the front half does not hit and as the base half slides. By applying strong pressure and rubbing, it is possible to reliably scrape out food particles remaining in the gaps between teeth and gums. Therefore, compared to conventional products, there is no need for a pushing operation, and cleaning can be performed efficiently by only a sliding operation.

Because the bristles are located almost on the extension axis of the base half, the positional relationship of the brush surface to the back of the teeth can be determined naturally and effortlessly by the feeling of gripping the base half, making the brushing operation easy. .

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the toothbrush for the back of the teeth of the present invention. Figure 2 is a view in the direction of the X arrow. FIG. 3 is a cross-sectional view taken along the - line. Figure 4 is a partial front view of the handle. FIG. 5 is a diagram showing the relationship between the brush surface and the back of the tooth. In the figure, 1 is the handle, 2 is the base half, 3 is the front half, 4 is the flocked part, 5 is the flocked side, 6 is the flocked side, 7 is the brush side,
8 is a large part of the brush surface, 9 is a small part of the brush surface, and a is an extension axis.

Claims (1)

[Scope of utility model registration request] While the base half of the handle is formed into a roughly rectangular diametrical cross section, the tip half is molded into a curved shape with the tip located approximately on the extension axis of the base half, and the diametrical cross section is approximately circular. The bristles are arranged at the tip in a substantially T-shape and the bristles surface is at an angle of approximately 40 degrees with respect to the extension axis of the base half, and the bristles on the bristles are arranged so that the brush surface follows the back side of the teeth. A large part of the convexly curved brush surface part is coupled with a small part of the flat brush surface part located on both sides of the convexly curved brush surface part in the direction of curvature and bent toward the same convexly curved brush surface part. A toothbrush designed for use on the back of the teeth.