JP3880761B2 - Brush with handle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a brush with a handle in which a handle portion is formed by a so-called two-color molding method. The handle portion is warped or twisted due to the two-color molding, or the figure displayed on the display surface is deformed. It relates to a brush with a prevented pattern.
[0002]
[Prior art]
Recent brushes with handles, such as toothbrushes, are so-called two-color molding methods for the purpose of controlling the bending and stretching properties of the handle portion gripped by the hand and displaying clear and permanent figures (including characters) on the shaft surface of the handle portion. A secondary molding material filling cavity (hereinafter simply referred to as “cavity”) formed in the handle portion is filled with a secondary molding material such as a thermoplastic resin or an elastomer having a color or flexibility different from that of the handle body. Things are increasing. In particular, many of these cavities are formed so as to be long in the axial direction of the handle portion, and a character string or a pattern of the primary molding material is displayed on the surface of the secondary molding material filled in the cavity. .
[0003]
FIGS. 2A, 2B, and 2C show an outline of a two-color molding method for molding a character string to be displayed. FIG. 2A is a plan view of the toothbrush handle after two-color molding is viewed from a surface on which a plurality of characters 1 are displayed (hereinafter referred to as “display surface”), and FIG. It is the top view which looked at the pattern main body 100 at the time of completion | finish of primary shaping | molding using a primary molding material from the display surface side, FIG.2 (c) is the cross section of the pattern main body 100 cut | disconnected by the axis X of FIG.2 (b). FIG.
In FIG. 2 (a), the handle body 100 includes, along the axis X, a flocked portion 11 for planting a brush, a neck portion 12 formed so as to bend and stretch, and a handle portion 113 held by a user. ing. The handle portion 113 is mainly formed by a handle body 100 made of a primary molding material. At the center of the handle portion 113, a two-color portion 114 made of a secondary molding material having a different color and material from the handle body 100 is used. Is formed to extend in the direction of the axis X, and characters 1... By the primary molding material are displayed on the display surface of the two color portions.
[0004]
The handle of this toothbrush is manufactured by the following method.
First, a pattern body 100 having a structure shown in FIGS. 2B and 2C is formed using a primary molding mold and a primary molding material (not shown). In the handle body 100, the handle portion 113 is divided into two in the direction of the axis X by a cavity 116 for filling a secondary molding material. 113B is connected by a relay portion 115 made of a primary molding material passing through the cavity 116. This relay portion is usually composed of two relay members 115A and 115B extending in parallel so as not to hinder the flow of the secondary molding material during the secondary molding. Further, from this relay portion 115, graphic projections 117... For displaying characters 1... Are projected so as to reach the display surface after the secondary molding is completed.
Next, the pattern body 100 is loaded into a secondary molding mold that covers at least the cavity 116, and the secondary molding material is injected into the cavity 116.
[0005]
[Problems to be solved by the invention]
In the handle of the toothbrush, the relay portion 115 is formed by two relay members 115A and 115B that are thinner than the handle portion 113, and the graphic projections 17 are projected on one side (display surface side). There is a difference in the amount of contraction of each part when the main body 100 is taken out from the primary mold, and in particular, the relay part 115 tends to warp or twist with the display surface inside. When the secondary molding is performed in this state, the handle portion 113 after being commercialized due to residual strain of the relay portion 115 is also warped or twisted.
Further, since the shape projections 117 are different in shape and size, the relay portion 115 is wavy due to the contraction difference, and the surface property of the shape projections 117 is deteriorated. Further, when the pattern body 100 is loaded into the secondary molding mold and the secondary molding material is injected into the cavity, the relay members 115A and 115B are bent by the injection pressure, and the warp and twist are added to the figure projection 117. Adhesion between the surface and the surface of the mold for secondary molding is lowered, and the position of the character is shifted or distorted, or the secondary molding material is put on the character and the shape changes or becomes unclear. . Further, in some cases, the secondary molding material protrudes to the surfaces of the divided pieces 113A and 113B, and the merchantability is significantly reduced.
The present invention has been made in order to solve the above-mentioned problems, and therefore the object of the present invention is to prevent the warp and twist and the deformation of the figure in the handle of the brush with handle formed by the two-color molding method. It is to provide a brush with a high handle.
[0006]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention provides a handle portion of a brush with a handle formed by a primary molding material, which is divided in an axial direction across a cavity for filling a secondary molding material, and each divided piece is a cavity. A brush with a handle which is connected by a relay part made of a primary molding material passing through the core and is filled with a secondary molding material in the cavity, and the relay part is made up of a plurality of relay members extending in parallel, and these Provided is a brush with a handle in which a gap between relay members is connected by a bridge portion.
[0007]
This brush with a handle is composed of a plurality of relay members extending in parallel with the relay portion connecting the divided pieces of the handle portion, and since the space between these relay members is empty, the secondary molding material that fills the cavity during the secondary molding Is not hindered by the relay section. And since the gap | interval of a relay member is connected by the bridge | bridging part, a relay member does not curve by the injection pressure of a secondary molding material, and neither the curvature nor twist arises in the handle | steering-wheel part after commercialization.
[0008]
In the brush with a handle in which a figure formed by the primary molding material is displayed on the surface of the secondary molding material filled in the cavity, a graphic projection for displaying the graphic from the relay portion is a display surface after the secondary molding. It is preferable to project so as to reach the above.
In this case, if the graphic projection is formed so as to straddle a plurality of relay members, this graphic projection also exhibits the same effect as the bridge portion, both the bridge portion and the graphic projection resist the stress deformation of the relay portion, warp, twist, A deformed brush with high merchantability is obtained by preventing deformation of the figure.
[0009]
In the brush with a handle of the present invention, side ribs that protrude from the relay portion and extend in the axial direction may be provided on both sides in the axial direction of the cavity filled with the secondary molding material. In this case, the resistance to warping, twisting and deformation of the figure is further enhanced.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, although the toothbrush handle which is one Embodiment of this invention is demonstrated in detail using drawing, this invention does not receive any restriction | limiting by this embodiment.
Fig.1 (a) is the top view which looked at the toothbrush handle of this embodiment from the display surface side in which the several character 1 ... was displayed, FIG.1 (b) is shape | molded by the primary molding material. It is the top view which looked at the handle body 10 of the same toothbrush handle from the display surface side, and FIG.1 (c) is sectional drawing cut | disconnected by line YY of FIG.1 (b).
In FIG. 1A, the toothbrush handle according to this embodiment includes a flocked portion 11 for planting a brush along an axis X, a neck portion 12 formed to bend and stretch, and a handle portion 13 that a user holds with a hand. It has become. This toothbrush handle is mainly formed by a pattern body 10 made of a primary molding material (polypropylene), but a secondary molding material (polyolefin) having a color and material different from that of the pattern body 10 is provided at the center of the handle portion 13. A two-color portion 14 made of a system elastomer) extends in the direction of the axis X, and the display surface of the two-color portion 14 displays characters 1... By the primary molding material.
[0011]
In the toothbrush handle of this embodiment, as shown in FIGS. 1B and 1C, the handle body 10 of the toothbrush handle formed by the primary molding material is separated from the cavity 16 for filling the secondary molding material by the axis X. Divided into two in the direction, each of the divided pieces 13A and 13B is connected by a relay portion 15 made of a primary molding material passing through the cavity. The relay portion 15 includes two relay members 15A and 15B extending in parallel, and the gaps between the relay members 15A and 15B are connected by bridge portions 21 at several places. Each relay member 15A, 15B is provided with a side rib 20 that protrudes toward the opposite side of the cavity filled with the secondary molding material and extends in the axial direction.
Further, the figure projections 17 for displaying the characters 1 on the display surface after the completion of the secondary molding are formed integrally with the pattern body 10 across the relay members 15A and 15B.
[0012]
This toothbrush handle can be manufactured by the following method.
First, the pattern body 10 is molded using a primary molding mold and a primary molding material. In the handle body 10, the handle portion 13 is divided into two in the axis X direction by a cavity 16 for filling a secondary molding material, and each of the divided pieces 13 </ b> A and 13 </ b> B is composed of two primary molding materials that pass through the cavity 16. The relay members 15A and 15B are connected to each other, and the relay members 15A and 15B are connected to each other by bridge portions 21 at several places. Further, the side ribs 20 projecting toward the side portions of the relay members 15A and 15B and extending in the axial direction. And a graphic projection 17 for displaying characters 1 on the display surface after the completion of the secondary molding is formed integrally with the pattern body 10 across the relay members 15A and 15B.
Next, the pattern body 10 is loaded into a secondary molding mold that covers at least the cavity 16, and the secondary molding material is injected into the cavity 16.
[0013]
The obtained toothbrush handle is not warped or twisted at the stage of primary molding, and is not deformed even by the injection pressure of the secondary molding material. There is no deformation or fogging on the characters.
[0014]
【The invention's effect】
The brush with a handle according to the present invention is composed of a plurality of relay members whose relay portions extend in parallel, and the gap between these relay members is connected by a bridge portion, so that the handle portion is warped, twisted or deformed. High merchantability.
[Brief description of the drawings]
1A and 1B show an embodiment of the present invention, in which FIG. 1A is a plan view viewed from a display surface side, FIG. 1B is a plan view of a handle body in the embodiment viewed from the display surface side, and FIG. FIG. 2 is a cross-sectional view taken along line YY in FIG.
2A is a plan view seen from the display surface side showing an example of a handle portion of a conventional brush with a handle, FIG. 2B is a plan view of the handle body, and FIG. 2C is a line XX; It is sectional drawing cut.
[Explanation of symbols]
1: Character 10: Pattern body 11: Flocked part 12: Neck part 13: Handle part 13A, 13B: Divided piece 14: Two-color part 15: Relay part 15A, 15B: Relay member 16: Cavity 17: Graphic projection 20: Side rib 21: Bridge part

Claims (2)

The handle portion gripped by the hand of the brush with the handle formed by the primary molding material is divided in the axial direction across the cavity for filling the secondary molding material, and each divided piece is a relay made of the primary molding material passing through this cavity. A brush with a handle that is connected at a portion and filled with a secondary molding material in the cavity,
A brush with a handle, wherein the relay portion includes a plurality of relay members extending in parallel, and a gap between the relay members is connected by a bridge portion. A brush with a handle in which a figure by a primary molding material is displayed on the surface of a secondary molding material filled in the cavity,
The brush with a handle according to claim 1, wherein a graphic projection for displaying the graphic from the relay portion is provided so as to reach a display surface after secondary molding.

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