KR102625898B1 - toothbrush - Google Patents

Abstract

The purpose of the present invention is to provide a toothbrush with high gripping properties against the handle without increasing cost. The handle portion 30 includes a first bulged portion 41 whose length in the width direction is maximized at a first position P1 in the major axis direction, and a length at a second position P2 on the rear end side of the first bulged portion. A first constriction portion 43 where the It has a second narrow portion 44 whose length becomes minimum at the fourth position P4. If the minimum length of the first constriction is PW2 and the maximum length of the second bulge is PW3, PW3 is 15 mm or more and 20 mm or less, and PW3/PW2 is 1.3 or more and 1.5 or less. If the thickness at the first position is PT1 and the thickness at the third position is PT3, PT3 is 15 mm or more and 20 mm or less, and PT3/PT1 is 1.7 or more and 2.5 or less.

Description

toothbrush

The present invention relates to toothbrushes.

This application claims priority based on Japanese Patent Application No. 2017-147972, filed in Japan on July 31, 2017, and uses its contents here.

Conventionally, in order to achieve cleaning of every corner of the oral cavity, compaction of the hair transplant portion was common, with an eye on operability within the oral cavity. However, when oral cleaning is performed with a compact hair transplant unit, skill in the cleaning method and cleaning time are required. Therefore, a toothbrush with a type of head with an enlarged bristle section (wide head) has been developed, but since the bristle section is designed to be wide, it has been pointed out that it is difficult for the bristle section to properly reach the cleaning area. .

Patent Document 1 discloses a toothbrush with a wide head specification that can clean multiple cleaning areas simultaneously by devising the bristle type and arrangement and has high cleaning properties.

Patent Document 1: Japanese Patent Laid-Open No. 2016-209616

However, with the conventional wide head specification toothbrush as described above, cleaning performance is improved to some extent, but since the interference of the bristles when in contact with the cleaning area is large, there is a possibility that the gripped handle part will shake and interfere with stable cleaning. there is. In order to improve the gripability of the handle by improving the ease of grip and slippage, it is also considered to provide a soft portion such as rubber on the surface of the handle.

However, in this case, in addition to the need to use multiple types of resin, there is a need to manufacture the handle portion by two-color molding, etc., resulting in a problem of increased cost. This problem is not limited to wide head specifications and may also occur in compact specification heads.

The present invention was made in consideration of the above points, and its purpose is to provide a toothbrush with high gripping properties against the handle without increasing cost.

According to the first aspect of the present invention, a head portion disposed on the front end side of the major axis direction and having a hair bundle implanted on the hair-flocking surface, a neck portion extended to the rear end of the head portion, and a handle extended to the rear end of the neck portion. Equipped with wealth,

The handle portion is disposed on the rear end side of the neck portion and bulges out by continuously changing symmetrically on both sides in the long axis direction and the width direction orthogonal to the front direction when viewed from the front direction perpendicular to the hair transplantation surface. A first bulge, a first constriction portion disposed on the rear end side of the first bulge portion, and a first constriction portion that continuously changes and narrows symmetrically on both sides in the width direction, and is disposed on the rear end side of the first constriction portion. and a second bulge that continuously changes and bulges symmetrically on both sides in the width direction, and is disposed on a rear end side of the second bulge, and is continuously changed and constricted symmetrically on both sides in the width direction. It has a second constriction,

The maximum length of the head portion in the width direction is 13 mm or more, and the first bulge portion has a maximum length in the width direction at a first position between the neck portion and the first narrow portion in the major axis direction. , the length of the first constricted portion in the width direction is minimized at a second position between the first bulge and the second bulge in the major axis direction, and the second bulged portion is positioned in the major axis direction. The length in the width direction is maximized at the third position between the first constriction and the second constriction, and the second constriction is at a rear end of the second bulge in the major axis direction. At position 4, the length in the width direction becomes minimum,

Let the length of the width direction of the first bulge portion at the first position be PW1, the length of the width direction of the first constriction portion at the second position be PW2, and let the length of the width direction of the first constriction portion at the second position be PW2. 2 If the length of the bulge in the width direction is PW3, the PW3 is 15 mm or more and 20 mm or less, PW3/PW2 is 1.3 or more and 1.5 or less, and the thickness in the front direction at the first position is Let PT1, the thickness in the front direction at the second position be PT2, and let PT3 be the thickness in the front direction at the third position, then PT3 is 15 mm or more and 20 mm or less, and PT3 /PT1 is 1.7 or more and 2.5 or less, the distance between the first position and the third position in the major axis direction is 30 mm or more and 60 mm or less, and the difference in thickness between PT3 and PT1 is 5.5 to 9 mm. , a toothbrush is provided that satisfies the following relationships (1) and (3).
PW3>PW1>PW2 … (One)
PT3>PT2>PT1 … (3)
Moreover, in the toothbrush according to one aspect of the present invention, when the thickness in the front direction at the fourth position is PT4 and the length of the width direction of the second narrow portion at the fourth position is PW4, It is characterized by satisfying the following relationships (2) and (4), respectively.
PW3>PW4>PW2 … (2)
PT3>PT4>PT1 … (4)
Moreover, in the toothbrush according to one aspect of the present invention, the length PW1 in the width direction of the first bulge in the first position is 14 mm or more and 17 mm or less, and the length PW1 of the first bulge in the first position is 14 mm or more and 17 mm or less. The length PW2 in the width direction of the first constriction is 11 mm or more and 14 mm or less, and the length PW4 in the width direction of the second constriction at the fourth position is 12.5 mm or more and 15.5 mm or less. .
Furthermore, in the toothbrush according to one aspect of the present invention, the thickness PT1 in the front direction at the first position is 6.5 mm or more and 9 mm or less, and the thickness PT2 in the front direction at the second position is , 9 mm or more and 11 mm or less, and the thickness PT4 in the front direction at the fourth position is 10 mm or more and 13 mm or less.

Furthermore, in the toothbrush according to one aspect of the present invention, the first bulge, the first constriction, the second bulge, and the second constriction have outlines adjacent to each other in the major axis direction when viewed from the front. It is characterized in that it is formed as a curve that circumscribes the bulge or constriction portion.

Furthermore, in the toothbrush according to one aspect of the present invention, the cross-sectional shape of the handle portion in the first position is a flat shape in which the length in the width direction is larger than the thickness in the front direction, and the cross-sectional shape of the handle portion in the first position is a flat shape in which the length in the width direction is larger than the thickness in the front direction. The cross-sectional shape of the handle portion is characterized in that it is approximately circular.

Moreover, in the toothbrush according to one aspect of the present invention, at least one of the front side and the back side of the handle portion in the first position has a groove portion.

Furthermore, in the toothbrush according to one aspect of the present invention, the groove portion is formed in an annular shape.

delete

In the present invention, it is possible to provide a toothbrush with high gripping properties against the handle portion without causing an increase in cost.

1 is a view showing an embodiment of the invention, and is a front view of a toothbrush 1.
Figure 2 is a side view of the toothbrush 1.
Figure 3 is a rear view of the toothbrush 1.
Figure 4 is a cross-sectional view of the handle portion 30 cut at the first position (P1).
Figure 5 is an enlarged side view of the first position (P1) in Figure 2.
Figure 6 is a cross-sectional view of the handle portion 30 cut at the third position (P3).
Figure 7 is an enlarged side view of the rear end of the handle portion 30 including the fourth position P4.

Hereinafter, embodiments of the toothbrush of the present invention will be described with reference to FIGS. 1 to 7.

In this embodiment, explanation is made using an example of a toothbrush with wide head specifications in which the width of the head portion is enlarged.

In addition, the following embodiment shows one aspect of the present invention, does not limit the present invention, and can be arbitrarily changed within the scope of the technical idea of the present invention. In addition, in the drawings below, in order to make each structure easier to understand, the scale and numbers of each structure are different from the actual structure.

1 is a front view of the toothbrush 1. Figure 2 is a side view of the toothbrush 1. Figure 3 is a rear view of the toothbrush 1.

The toothbrush 1 of this embodiment includes a head portion 10 disposed on the distal end side (hereinafter simply referred to as the distal end side) in the major axis direction and into which bristle bundles (not shown) of bristles are planted, and the head portion. A neck portion 20 extended to the rear end side in the major axis direction (hereinafter referred to only as the rear end side) of (10), and a handle portion 30 extended to the rear end side of the neck portion 20 (hereinafter referred to as the head portion 10). ) and the neck portion 20 and the handle portion 30 are collectively referred to as the handle body 2).

The head portion 10 has a hair-flocking surface 11 on one side of the thickness direction. Hereinafter, in the thickness direction, the side of the hair transplantation surface 11 is referred to as the front side of the front direction, the side opposite to the hair transplantation surface 11 is referred to as the back side, and the direction perpendicular to the front direction and the major axis direction is referred to as the width direction. . In addition, in the following description, the thickness in the front direction is simply referred to as thickness. A plurality of hair transplant holes 12 are formed on the hair transplantation surface 11. A hair bundle (not shown) is planted in the hair transplant hole 12.

The head portion 10 has a wide head specification. The maximum width W1 of the head portion 10 is 13 mm or more and 16 mm or less. The length of the head portion 10 is not particularly limited, and is preferably 10 mm or more and 33 mm or less, for example. If the length of the head portion 10 is more than the above lower limit, a sufficient area for planting the hair bundle can be secured, and if the length is less than the above upper limit, operability in the oral cavity can be further improved.

Among the plurality of tufting holes 12, the distance between the tufting hole 12 located at the most distal end of the head 10 and the distal end of the head 10, and the distance between the distal tip of the head 10 and the tufting hole 12 located at the most distal end of the head 10. The distance between the tuft hole 12 and the rear end of the head portion 10 is set to be equal. In other words, if the distance between the tuft hole 12 located at the most distal end of the head 10 and the distal end of the head 10 is d, then the boundary position between the head 10 and the neck 20 is is a position away from the tuft hole 12 located at the rearmost end of the head portion 10 by a distance equal to the distance d toward the rear end.

The thickness of the head portion 10 can be determined in consideration of the material of the handle body 2, etc., and is preferably 2.0 mm or more and 6.0 mm or less, and more preferably 3.0 mm or more and 5.0 mm or less. If the thickness is more than the above lower limit, the strength of the head portion 10 can be further increased, and if it is less than the above upper limit, the reach into the molars can be improved and operability in the oral cavity can be further improved.

The length of the neck portion 20 is preferably 40 mm or more and 70 mm or less because the neck portion 20 comes into contact with the lips when the head portion 10 is inserted into the oral cavity.

The minimum width and minimum thickness of the neck portion 20 are preferably, for example, 3.0 mm or more and 6.0 mm or less. If it is more than the above lower limit, the strength of the neck portion 20 can be further increased, and if it is less than the above upper limit, it is easy to close the lips, the reach to the molars can be improved, and operability in the oral cavity can be further improved. there is.

In addition, as described later, the boundary between the neck portion 20 and the handle portion 30 includes a boundary 31 on the front side and a boundary 32 on the back side (see FIG. 5), and the neck portion 20 ) The position of the rear end side when calculating the length is to use the boundary 31 on the front side.

As shown in FIG. 2, the neck portion 20 extends substantially parallel to the hair transplantation surface 11 on both the front side and the back side. The front side of the neck portion 20 has an arc-shaped curved outline 21 that has a polar center on the front side when viewed from the side and gradually moves upward (to the front side) toward the rear end. The back side of the neck portion 20 has an arc-shaped curved outline 22 that has a polar center on the back side when viewed from the side and gradually moves downward (to the back side) toward the rear end.

As shown in the front view of FIG. 1 and the back view of FIG. 3, the handle portion 30 includes a first bulge 41 and a second bulge whose length in the width direction continuously changes symmetrically on both sides. A bulging portion 42, a first constriction portion 43 and a second constriction portion 44 whose length in the width direction continuously changes symmetrically on both sides and is narrowed, and a through hole 46 disposed near the rear end. I have it. The first bulged portion 41, the first constricted portion 43, the second bulged portion 42, and the second constricted portion 44 are arranged sequentially along the major axis direction from the distal end side. Additionally, a groove portion 45A is formed on the front side of the handle portion 30, and a groove portion 45B is formed on the rear side of the handle portion 30.

The length of the first bulged portion 41 in the width direction becomes maximum at the first position P1 on the distal end side in the major axis direction. The first position P1 is a position where the length of the first bulged portion 41 in the width direction is maximized between the neck portion 20 and the first narrow portion 43 in the major axis direction. The length of the 1st narrow part 43 in the width direction becomes the minimum at the 2nd position P2 arrange|positioned at the rear end side rather than the 1st position P1 in the major axis direction. The second position P2 is a position where the length of the first constricted portion 43 in the width direction is minimum between the first bulged portion 41 and the second bulged portion 42 in the major axis direction. The length of the second bulge 42 in the width direction becomes maximum at the third position P3, which is located at the rear end of the second position P2 in the major axis direction. The third position P3 is a position where the width direction length of the second bulge portion 42 is maximized between the first constriction portion 43 and the second constriction portion 44 in the major axis direction. The length of the 2nd narrow part 44 in the width direction becomes minimum at the 4th position P4 arrange|positioned at the rear end side rather than the 3rd position P3 in the major axis direction. The fourth position P4 is a position at which the width direction length of the second constriction 44 is the minimum on the rear end side compared to the third position P3 in the major axis direction. That is, the third position P3 is a position where the width changes from a curve or straight line forming a narrow double edge to a widening curve or straight line, or a straight line with the same width.

The first bulge 41, the first constriction 43, the second bulge 42, and the second constriction 44 each have an outline when viewed from the front that is adjacent to the bulge or constriction in the long axis direction. They are formed with gentle curves that circumscribe each other.

Specifically, the first bulge 41 has an arc-shaped curved outline C1 with the center of curvature at the center side in the width direction in front view. The first narrow portion 43 has an arc-shaped curved outline C2 having the center of curvature on the outer side in the width direction in front view. The second bulge 42 has an arc-shaped curved outline C3 with the center of curvature at the center side in the width direction in front view. The second constriction 44 has an arc-shaped curved outline C4 with the center of curvature on the outer side in the width direction in front view. Each curved outline C1 to C4 is circumscribed with a neighboring curved outline in the long axis direction.

The handle portion 30 has the width direction length of the first bulge portion 41 (width at the first position P1) as PW1, and the width direction length of the first constriction portion 43 (second width). Let the width at the position P2 be PW2, the length in the width direction of the second bulge 42 (width at the third position P3) be PW3, and let the width of the second constriction 44 be PW3. If the length in the direction (width at the fourth position P4) is PW4, the following relationships (1) and (2) are satisfied, respectively.

PW3>PW1>PW2 … (One)

PW3>PW4>PW2 … (2)

The width PW1 at the first position P1 is preferably 14 mm or more and 17 mm or less.

The width PW2 at the second position P2 is preferably 11 mm or more and 14 mm or less.

The width PW3 at the third position P3 is preferably 15 mm or more and 20 mm or less.

The width PW4 at the fourth position P4 is preferably 12.5 mm or more and 15.5 mm or less.

The difference in width (PW1-PW2) between the first position P1 and the second position P2 is preferably 2.5 mm or more and 3.5 mm or less.

The difference in width (PW3-PW2) between the third position P3 and the second position P2 is preferably 4 mm or more and 5.5 mm or less.

The difference in width (PW4-PW2) between the fourth position P4 and the second position P2 is preferably 0.5 mm or more and 1.5 mm or less.

PW3/PW2 is preferably 1.3 or more and 1.5 or less.

As shown in FIG. 2, the front side of the handle portion 30 is disposed at the first position P1, has an arc-shaped curved outline C11 having the center of curvature on the front side in side view, and a second position. An arc-shaped curved outline C12 disposed at (P2) and having a center of curvature on the front side in a side view, and an arc-shaped curved outline C12 disposed at the third position P3 and having a center of curvature on the back side in side view. The curved outline C13, the arc-shaped curved outline C14 disposed at the fourth position P4 and having a center of curvature on the front side in the side view, and the curved outlines C12 and C13 are respectively circumscribed in the side view. It has an arc-shaped curved outline (C15) with the center of curvature on the back side. The curved outlines C12 to C15 are circumscribed with neighboring curved outlines in the long axis direction.

As shown in FIG. 2, the back side of the handle portion 30 is disposed at the first position P1, has an arc-shaped curved outline C21 having the center of curvature on the back side in side view, and a second position. An arc-shaped curved outline C22 disposed at (P2) and having a center of curvature on the front side in side view, and an arc-shaped curved outline C22 disposed at the third position P3 and having a center of curvature on the front side in side view. The curved outline C23, the arc-shaped curved outline C24 disposed at the fourth position P4 and having a center of curvature on the back side in a side view, and the curved outlines C22 and C23 are respectively circumscribed in a side view. It has an arc-shaped curved outline (C25) with the center of curvature on the front side. The curved outlines (C22 to C025) are circumscribed with neighboring curved outlines in the long axis direction.

The handle portion 30 has a thickness at the first position P1 of PT1, a thickness of the second position P2 of PT2, a thickness of the third position P3 of PT3, and If the thickness at the 4 position (P4) is PT4, the following relationships (3) and (4) are satisfied, respectively.

PT3>PT2>PT1 … (3)

PT3>PT4>PT1 … (4)

The thickness PT1 at the first position P1 is preferably 6.5 mm or more and 9 mm or less.

The thickness PT2 at the second position P2 is preferably 9 mm or more and 11 mm or less.

The thickness PT3 at the third position P3 is preferably 15 mm or more and 20 mm or less.

The thickness PT4 at the fourth position P4 is preferably 10 mm or more and 13 mm or less.

The difference in thickness (PT2-PT1) between the first position P1 and the second position P2 is preferably 1.5 mm or more and 3.0 mm or less.

The difference in thickness (PT3-PT1) between the first position P1 and the third position P3 is preferably 5.5 mm or more and 9 mm or less.

The difference in thickness (PT4-PT1) between the first position P1 and the fourth position P4 is preferably 2.5 mm or more and 4.5 mm or less.

PT3/PT1 is preferably 1.7 or more and 2.5 or less.

Additionally, the distance between the first position P1 and the third position P3 is preferably 30 mm or more and 60 mm or less. If the distance between the first position P1 and the third position P3 is less than the above-mentioned lower limit, the distance between the first position P1 and the third position P3 when the handle portion 30 is gripped. It is shortened, so that the tip of the thumb in contact with the front side of the second position P2 and the index finger in contact with the circumferential direction of the second position P2 become closer, so that they are in contact with the head portion 10 during cleaning. In addition to the possibility that the auxiliary function when a load is applied may deteriorate, it becomes difficult to tactilely distinguish between the first position P1 and the third position P3. If the distance between the first position P1 and the third position P3 exceeds the above upper limit, the distance between the first position P1 and the third position P3 when the handle portion 30 is held. As it becomes longer, the front side of the first position (P1) becomes the supporting part of the terminal joint of the thumb, and in the third position (P3), the middle finger and ring finger come into contact in the circumferential direction, making maintenance difficult. there is.

FIG. 4 is a cross-sectional view of the handle portion 30 cut at the first position P1.

As shown in Fig. 4, the cross-sectional shape of the handle portion 30 (first bulged portion 41) at the first position P1 is a flat shape in which the length in the width direction is larger than the thickness. On the front side of the handle portion 30, a groove portion 45A, which is circular when viewed from the front and is formed in an annular shape centered on the width direction center at the first position, is provided. On the back side of the handle portion 30, a groove portion 45B, which is circular when viewed from the front and is formed in an annular shape with the center of the width direction at the first position as the center, is provided.

Moreover, as shown in FIG. 4, the front side of the handle part 30 has an arc-shaped curved outline C31 with the center of curvature on the back side in the width direction. There are grooves 45A on both sides of the curved outline C31, and the height T1 is formed with a step difference of 0.5 to 1.5 mm.

Similarly, the back side of the handle portion 30 has an arc-shaped curved outline C32 with the center of curvature on the front side in the width direction. There are grooves 45B on both sides of the curved outline C32, and the height T2 is formed with a step that is 0.5 to 1.5 mm lower.

FIG. 5 is an enlarged side view of the first position P1 in FIG. 2.

The boundary 31 between the neck portion 20 and the handle portion 30 on the front side is, in a side view, the curved outline 21 disposed on the front end side of the boundary 31 and the boundary 31 on the rear end side. It is formed by ridges at the points where the arranged curved outline C11 intersects. The frontal position of the border 31, that is, the position where the curved outline C11 intersects the curved outline 21, is located on the front side than the position where the curved outline C11 intersects the curved outline C12. . Therefore, a curved surface that protrudes steeply compared to the rear end side than the first position P1 is formed at the front end side compared to the first position P1 on the front side.

The height T3 of the groove 45A on the distal end side in the major axis direction is formed with a step of 0.5 to 1.5 mm.

The height T4 of the groove 45A on the rear end side in the major axis direction is formed with a step of 0.5 to 1.5 mm.

Similarly, the boundary 32 between the neck portion 20 and the handle portion 30 on the back side is, in a side view, the curved outline 22 disposed on the front end side of the boundary 32 and the rear end of the boundary 32. It is formed by ridges at the points where the curved outline C21 arranged on the side intersects. The frontal position of the border 32, that is, the position where the curved outline C21 intersects the curved outline 22, is disposed on the back side compared to the position where the curved outline C21 intersects the curved outline C22. . Accordingly, on the front end side of the first position P1 on the back side, a curved surface is formed that protrudes steeply compared to the rear end side of the first position P1.

The height T5 of the groove 45B on the distal end side in the major axis direction is formed with a step of 0.5 to 1.5 mm.

The height T6 of the groove 45B on the rear end side in the major axis direction is formed with a step of 0.5 to 1.5 mm.

Fig. 6 is a cross-sectional view of the handle portion 30 cut at the third position P3.

As shown in FIG. 6, the cross-sectional shape of the handle portion 30 at the third position P3 is approximately circular. The maximum diameter of the handle portion 30 at the third position P3 is preferably 15 mm or more and 20 mm or less. If the maximum diameter of the handle portion 30 is below the above-mentioned lower limit, when the area around the third position P3 is gripped with a palm grip, the grip area is small and the middle and ring fingers do not come into sufficient contact, making it prone to slipping and poor grip. There is a possibility that this may deteriorate. If the maximum diameter of the handle portion 30 exceeds the above-mentioned upper limit, when the area around the third position P3 is grasped with a palm grip, the circumferential length increases, making it difficult to grip.

FIG. 7 is an enlarged side view of the rear end of the handle portion 30 including the fourth position P4.

As shown in FIG. 7, a through hole 46 penetrating in the front direction is formed near the rear end of the handle portion 30. Additionally, as shown in FIGS. 1 and 7, a groove portion 47 extending from the through hole 46 toward the distal end is disposed on the front side of the handle portion 30. As an example, the groove portion 47 is formed in a semicircular cross-sectional shape and has a depth of about 1 mm.

Similarly, on the rear side of the handle portion 30, a groove portion 49 extending toward the distal end from the through hole 46 to the fourth position P4 is disposed. As an example, the groove portion 49 is formed in a semicircular cross-sectional shape and has a depth of about 1 mm.

The length of the handle body 2 is not particularly limited, and is, for example, 100 to 200 mm. The handle body 2 is integrally molded into a long shape as a whole, and can be obtained, for example, by injection molding using resin as a material. As an example of the resin constituting the handle body 2, a resin having a bending elastic modulus (JIS7171) of 1000 MPa or more and 2200 MPa or less can be mentioned, for example, polypropylene resin (PP), polyacetal resin (POM) , polystyrene resin (PS), polyethylene terephthalate resin (PET), polybutylene terephthalate resin (PBT), acrylonitrile butadiene styrene resin (ABS), polyarylate resin, polycarbonate resin, acrylonitrile styrene resin ( AS), etc. Among these, polypropylene resin, which is a general-purpose resin, is preferable when considering specific aspect.

The hair bundle is a bundle of multiple faces. The length from the hair transplantation surface 11 to the tip of the hair bundle can be determined in consideration of the hair elasticity required for the hair bundle, and is, for example, 6 to 14 mm. All hair bundles may be the same or may be different.

The thickness of the hair bundle (hair bundle diameter) can be determined in consideration of the hair elasticity required for the hair bundle, and is, for example, 1 to 3 mm. All hair bundles may be the same or may be different from each other.

As for the hair constituting the hair bundle, for example, hair whose diameter gradually becomes smaller toward the hairline and the hairline is sharpened (tapered hair), hair whose diameter is almost the same from the hair transplant surface 11 toward the hairline (straight hair) ), etc. Examples of straight hair include those in which the hairline is a plane substantially parallel to the hair transplantation surface 11, and those in which the hairline is rounded into a hemispherical shape.

The material of the bristle is, for example, polyamide such as 6-12 nylon (6-12NY), 6-10 nylon (6-10NY), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), poly. Polyesters such as trimethylene terephthalate (PTT), polyethylene naphthalate (PEN), and polybutylene naphthalate (PBN), polyolefins such as polypropylene (PP), polyolefin-based elastomers, and styrene-based elastomers. Stormer resin, etc. can be mentioned. These resin materials can be used individually or in combination of two or more types. Additionally, examples of the cap include polyester caps having a multi-center structure having a core portion and at least one layer of sheath provided outside the core portion.

The cross-sectional shape of the hair is not particularly limited, and may be circular such as a true circle or oval, polygonal, shaped, three-leaf clover-shaped, four-leafed clover-shaped, etc. The cross-sectional shape of all features may be the same or different.

The thickness of the hair can be determined in consideration of the material, etc., and when the cross-section is circular, for example, it is 6 to 9 mil (1 mil = 1/1000 inch = 0.025 mm). In addition, taking into account the feeling of use, feeling of cleansing, cleaning effect, durability, etc., a plurality of wools with different thicknesses may be arbitrarily combined and used.

The handle body 2 of the toothbrush 1 of the above structure is formed, for example, by injection molding using a mold having a space (cavity) of a shape and size corresponding to the handle body 2. The gate for injecting molten resin into the mold is disposed at the rear end of the handle body 2, for example. The molten resin injected from the gate is manufactured by filling the cavity of the mold and taking it out from the mold after cooling.

In the handle body 2, a bright material such as a pearl pigment mixed with a resin may be used for injection molding for the purpose of improving texture and design or creating a sense of luxury. The resin containing this type of bright material orients the bright material when flowing in the mold, so in terms of appearance, jetting and flow, especially in the head portion 10 at the end of the flow, compared to the case where the bright material is not used. Marks and weld lines become more visible.

In the handle body 2 of this embodiment, the through hole 46 is disposed at a position directly adjacent to the gate 50, so that the gate 50 is formed by an axial mold forming the through hole 46. It becomes possible to control the flow of molten resin injected from and control the speed and size of the flow path. Accordingly, jetting and flow marks become less noticeable in appearance. In addition, the groove portions 47 and 49 extending toward the distal end from the through hole 46 to the fourth position P4 are disposed, thereby forming a weld line that occurs when the molten resin joins after being separated by the through hole 46. Since the and groove portions 47 and 49 overlap, it becomes difficult to stand out in appearance.

Next, the action when the handle portion 30 of the toothbrush 1 is held with a palm grip will be described.

(First position (P1))

The front side of the first position P1 in the handle portion 30 becomes a support portion on the neck portion 20 side, and the terminal joint of the thumb comes into contact with it. The middle finger of the index finger comes into contact with the back side of the first position P1. Thereby, the handle part 30 is held in the first position P1 so as to fit from the front side and the back side. At this time, since the groove portion 45A is disposed on the front side of the first position P1 and the groove portion 45B is disposed on the back side of the first position P1, the support portion can be clearly tactile. In addition, since the groove portions 45A and 45B are formed in a circular annular shape, it becomes difficult to slip even when the finger moves in a plane roughly parallel to the hair transplantation surface 11, including the width direction and the long axis direction.

In addition, since the cross section of the handle portion 30 is flat at the first position P1, the handle portion 30 has a large area between the thumb on the front side and the index finger on the back side at the first position P1. It is easy to apply force and stable support is possible. Therefore, the force applied to the handle portion 30 at the first position P1, which is close to the head portion 10, is easily transmitted to the head portion 10, thereby improving operability and allowing the planting surface to neatly contact the teeth. You can.

(second position (P2))

The second position P2 functions as an auxiliary part on the neck part 20 side for distinguishing the first position P1 and the third position P3 when the handle part 30 is held. When the handle portion 30 is held with a palm grip, the tip of the thumb is in contact with the front side of the second position P2, and the index finger is in contact with the circumferential direction of the second position P2. It is possible to auxiliary hold the middle portion of the handle portion 30, which is held in the first position (P1) by inserting it from the front side and the back side, and held by the palm, middle finger, and ring finger in the third position (P3). Since the first narrow portion 43 is disposed at the second position P2 when viewed from the front, the index finger can be easily brought into contact in the circumferential direction. In addition, because the first narrow portion 43 is disposed, when the handle portion 30 is held, the difference in shape between the first position P1 and the third position P3 can be tactilely recognized, It is naturally made easy to grip, making it possible to fit it.

(Third position (P3))

At the third position P3, the largest second bulged portion 42 in the width direction is disposed and functions as a gripping stabilizing portion. When the handle portion 30 is held with a palm grip, the palm, middle finger, and ring finger are in contact with the circumferential direction of the third position P3. The handle portion 30 has a roughly circular cross-sectional shape at the third position P3, and the maximum length PW3 and maximum thickness PT3 in the width direction are compared with those at other positions P1, P2, and P4. Because it is the largest, it fits in the hand held and can be held stably.

(4th position (P4))

The area up to the rear end including the fourth position P4 functions as an auxiliary part when the handle portion 30 is held with a palm grip, especially when the third position P3 is held with the palm, middle finger, and ring finger. do. When the handle portion 30 is held with a palm grip, the ring finger, the little finger, and the moon ball of the palm come into contact with the circumferential direction of the fourth position P4. Since the maximum width PW4 and thickness PT4 at the fourth position P4 are both smaller than the maximum width PW3 and thickness PT3 at the third position P3, even for the ring finger and little finger that are shorter than the middle finger. It can be stably contacted in the direction around the fourth position P4.

In the above-described handle portion 30, since the width direction lengths at the first position P1 to the fourth position P4 satisfy the above-mentioned relationships (1) and (2), respectively, it is difficult to slip. While contacting the thumb on the front side and the index finger on the back side with a large area on the support portion at the first position P1, the second bulging portion 42 at the third position P3 formed at the maximum diameter is directed in the circumferential direction. By bringing the palm, middle finger, and ring finger into contact, it fits into the hand held and can be held stably. In addition, since the minimum width PW2 of the first constriction 43 is smaller than the maximum width PW1 of the first bulge 41 and the maximum width PW3 of the second bulge 42, the first position P1 ) and the middle portion of the handle portion 30 held in the third position P3 can be auxiliary held, thereby improving operability during cleaning by stable gripping. In addition, since the minimum width PW4 of the rear end including the second constriction 44 is larger than the minimum width PW2 of the first constriction 43, support in the second bulge 42 is provided at the rear end. Since it is possible to provide firm support from the beginning, it can contribute to further stabilization of grip properties. The above effect is further obtained when the above-mentioned PW3/PW2 is 1.3 or more and 1.5 or less.

In addition, in the above-mentioned handle portion 30, the thickness at the first position P1 to the fourth position P4 satisfies the above-mentioned relationships (3) and (4), respectively, and the first position serving as the support portion is Since the thickness of (P1) is set to be the thinnest, the first position (P1) can be easily and strongly clamped from the front side and the back side. For this reason, the force applied to the handle portion 30 at a position close to the head portion 10 is easily transmitted to the head portion 10, thereby improving operability and allowing the hair transplantation surface to be neatly brought into contact with the china. Additionally, because the thickness of the first position P1 is thin, a steeply protruding curved surface is formed between the boundaries 31 and 32 between the neck portion 20 and the handle portion 30 and the first position P1. Therefore, the thumb and forefinger in contact with the support portion engage the rear end side with the curved surface, thereby suppressing the gripped handle portion 30 from shaking in the major axis direction. The above effect is further obtained when the above-mentioned PT3/PT1 is 1.7 or more and 2.5 or less.

In addition, in the above-described handle portion 30, the curved outline C1 of the first bulged portion 41, the curved outline C2 of the first constricted portion 43, and the curved outline of the second bulged portion 42 ( C3) and the curved outline C4 of the second constriction 44 circumscribe the adjacent curved outline in the long axis direction, and the curved outline C11, the curved outline C12, the curved outline C13, and the curved line on the front side. The contour C14 and the curved contour C15 are circumscribed with the adjacent curved contour in the long axis direction, and the curved contour C21, the curved contour C22, the curved contour C23, the curved contour C24, and the curved curve on the back side. The contour C25 is circumscribed with a curved contour neighboring it in the long axis direction, so that each contour is gently connected. Therefore, the above-mentioned handle portion 30 can accommodate various holding methods and can realize the toothbrush 1 that is excellent in operability and versatility.

In this way, in the toothbrush 1 of the present embodiment, by appropriately setting the shape and size of the handle portion 30, the handle portion 30 can be used without increasing costs by using a soft portion or the like. It becomes possible to obtain a toothbrush 1 that has high gripping properties and is highly operable during cleaning. In particular, in this embodiment, in a configuration having a head portion 10 with a wide head specification, when the bristle portion comes into contact with the cleaning site, the interference of the bristle bundles is large, causing the gripped handle portion to shake and reach the cleaning site appropriately. Even in cases where it is difficult to do so, since it has a handle portion 30 that fits in the hand and has high gripping properties, operability is good and the hairs can be brought into neat contact with the teeth.

As mentioned above, preferred embodiments of the present invention have been described with reference to the accompanying drawings, but it goes without saying that the present invention is not limited to these examples. The various shapes and combinations of each constituent member shown in the above-described examples are examples, and various changes can be made based on design requirements, etc., without departing from the main spirit of the present invention.

For example, in the above embodiment, a configuration in which the groove portions 45A and 45B are provided on both the front side and the back side of the first position P1 is illustrated, but a configuration in which they are provided only on the front side or the back side may be used.

In addition, in the above embodiment, a configuration using the head portion 10 of a wide head specification is illustrated, but the present invention is not limited to the wide head specification, and the present invention can be applied even to a head portion of a normal type or compact specification.

The present invention can be applied to toothbrushes.

1: Toothbrush 2: Handle body
10: head part 11: hair transplant side
20: neck part 30: handle part
41: first bulge 42: second bulge
43: first narrow portion 44: second narrow portion
45A, 45B: groove P1: first position
P2: 2nd position P3: 3rd position
P4: 4th position

Claims (8)

A head portion disposed at the distal end in the long axis direction and having hair bundles planted on the hair transplantation surface;
A neck portion extended to the rear end of the head portion,
A handle portion is provided at the rear end of the neck portion,
The handle portion is disposed on the rear end side of the neck portion and bulges out by continuously changing symmetrically on both sides in the long axis direction and the width direction orthogonal to the front direction when viewed from the front direction perpendicular to the hair transplantation surface. A first bulge,
a first constriction portion disposed at a rear end side of the first bulge portion and continuously changing and narrowing symmetrically on both sides in the width direction;
a second bulged portion disposed at a rear end side of the first constricted portion and bulging in a continuously changing manner symmetrically on both sides in the width direction;
It is disposed on the rear end side of the second bulge, and has a second constriction that continuously changes symmetrically on both sides in the width direction and becomes constricted,
The maximum length of the head portion in the width direction is 13 mm or more,
The first bulged portion has a maximum length in the width direction at a first position between the neck portion and the first constriction portion in the major axis direction,
The first constricted portion has a minimum length in the width direction at a second position between the first bulged portion and the second bulged portion in the major axis direction,
The second bulged portion has a maximum length in the width direction at a third position between the first narrow portion and the second narrow portion in the major axis direction,
The length of the second narrow portion in the width direction becomes minimum at a fourth position on the rear end side of the second bulge portion in the major axis direction,
Let the length of the first bulge in the width direction at the first position be PW1,
Let the length of the width direction of the first narrow portion at the second position be PW2,
If the length of the second bulge in the width direction at the third position is PW3,
The PW3 is 15 mm or more and 20 mm or less,
PW3/PW2 is 1.3 or more and 1.5 or less,
Let the thickness in the front direction at the first position be PT1,
Let the thickness in the front direction at the second position be PT2,
If the thickness in the front direction at the third position is PT3,
The PT3 is 15 mm or more and 20 mm or less,
PT3/PT1 is 1.7 or more and 2.5 or less,
The distance between the first position and the third position in the major axis direction is 30 mm or more and 60 mm or less,
The difference in thickness between PT3 and PT1 is 5.5 to 9 mm,
A toothbrush characterized by satisfying the following relationships (1) and (3).
PW3>PW1>PW2 … (One)
PT3>PT2>PT1 … (3) According to paragraph 1,
The thickness in the front direction at the fourth position is PT4,
When the length of the width direction of the second narrow portion at the fourth position is PW4,
A toothbrush characterized by satisfying the following relationships (2) and (4), respectively.
PW3>PW4>PW2 … (2)
PT3>PT4>PT1 … (4) According to claim 1 or 2,
The width direction length PW1 of the first bulged portion at the first position is 14 mm or more and 17 mm or less,
The length PW2 in the width direction of the first narrow portion at the second position is 11 mm or more and 14 mm or less,
The toothbrush characterized by the above-mentioned length PW4 of the said width direction of the said 2nd narrow part in the said 4th position being 12.5 mm or more and 15.5 mm or less. According to claim 1 or 2,
The thickness PT1 in the front direction at the first position is 6.5 mm or more and 9 mm or less,
The thickness PT2 in the front direction at the second position is 9 mm or more and 11 mm or less,
The toothbrush characterized in that the thickness PT4 in the front direction at the fourth position is 10 mm or more and 13 mm or less. According to claim 1 or 2,
The first bulge, the first constriction, the second bulge, and the second constriction are each formed as a curve whose outline when viewed from the front is circumscribed with a bulge or constriction adjacent to the major axis direction. A toothbrush characterized by having. According to claim 1 or 2,
The cross-sectional shape of the handle portion in the first position is a flat shape in which the length in the width direction is larger than the thickness in the front direction,
A toothbrush, characterized in that the cross-sectional shape of the handle portion at the third position is approximately circular. According to claim 1 or 2,
A toothbrush characterized in that at least one of the front side and the back side of the handle portion in the first position has a groove portion. In clause 7,
A toothbrush characterized in that the groove portion is formed in an annular shape.

Images