JPH0418502Y2 - - Google Patents

Description

[Detailed explanation of the idea]

<Industrial Application Field> The present invention relates to a lipstick which is a make-up cosmetic, and more particularly to a lipstick consisting of two different color bases. <Prior Art> For a long time, lipsticks were based on one lipstick and only one color. As a result, consumers carried around multiple bottles of lipstick. Recently, however, it has become possible to blend two colors into one lipstick by filling and molding bases of different colors at different times during lipstick molding. There is also a lipstick in which the lipstick main body is constituted by columnar bases of two different colors, which are divided along the axis from the top of the lipstick body. Furthermore, Japanese Utility Model Publication No. 37-17600 introduces a lipstick in which a portion of the two-color lipstick has concave and convex portions that fit into each other, and the state of the fitting can be visually recognized as a base boundary line. <Problem to be solved> However, in conventional lipsticks, the bonding surfaces of bases of different colors are smooth, and the difference in shrinkage rate, harmony, and surface (interface) condition of each base makes it difficult to Physical weakness occurs at the joint surface,
This had the disadvantage of compromising the strength and stability of the product. Specifically, since the joint surface is smooth,
It has the disadvantage that it is extremely vulnerable to stress in a direction parallel to the joint surface, and that "misalignment" between both bases easily occurs. On the other hand, the lipstick introduced in Japanese Utility Model Publication No. 37-17600 is a type of lipstick that is joined at a vertical joint surface, and a part of the lipstick is formed with an uneven surface that fits into each other. However, the concave and convex portions of the lipstick that fit into each other have small radii, which is inconvenient in manufacturing, and furthermore, the drawbacks of easy ``misalignment'' between the two bases have not been satisfactorily improved. Moreover, it was brittle against shocks such as drops, and the base could be damaged due to uneven parts. <Means for solving the problems> The inventors of the present invention have conducted intensive research in view of the above-mentioned problems, and as a result have completed the present invention. In other words, in a lipstick that is composed of columnar bases of two different colors that are divided along the axis from the top, and the boundary line of the joint surface appears as a gently wavy base boundary line, these base joint surfaces are parallel to the axis of the lipstick. It is made up of only gentle wave surfaces along the lipstick, and the joint surface has a wavy uneven surface that fits into each other, and the radii of the wavy line and the wave surface are the same and almost match the radius of the lip stick. It has a characteristic lipstick. In the present invention, the joining surfaces of the two bases are composed only of wave surfaces, and there is no vertical joining surface. By employing such a configuration, stress is dispersed in multiple directions, making it possible to enhance stability against bending and displacement. Furthermore, since the bonding surface area becomes larger with respect to the vertical plane, the above effect is further influenced. The radius of the wavefront is approximately the same as the radius of the lipstick. In this invention, substantially the same means a range of 80 to 120%.
If it is less than 80%, stability can be strengthened, but it is unfavorable as it becomes vulnerable to shocks such as drops. If it exceeds 120%, the fitting portion will be shallow and the joint area cannot be increased, which is not preferable. Next, the present invention will be explained in detail with reference to Examples, but the present invention is not limited thereto. Embodiments Embodiment 1 As shown in FIGS. 1 to 4, a lipstick is composed of columnar bases of two different colors that are divided along the axis from the top of the lipstick.
The joint surfaces of these bases form only a gently wavy curve along the axis of the lipstick, and the joint surfaces have generally gently wavy, interlocking concave and convex surfaces. The radius of the wavefront matches the radius of the lipstick. Further, the boundary line of the joint surface appears as a gently wavy base boundary line. <Effects of the Invention> The lipstick of the present invention can enhance stability against shifting and breaking due to external stress. The effects will be shown below using experimental examples. (Experiment example) As shown in Figures 5 and 6, fix the base of the lipstick base and hold it in a fixed position.
Look at the stress when the joint surface slips. The samples of the present invention are the same as in Example 1, with the radius of the wavefront being 85% and 115%. As a comparative example, lipsticks were used which were joined at a vertical joint surface as shown in FIGS. 7 to 10, and which had a concave and convex portion that fit into one part of the vertical joint surface. (Experimental results) When force is applied to only one side of the two surfaces that are joined in a direction parallel to the bonding surfaces, as shown in Table 1, it is clear that the lipstick of the present invention has superior strength compared to the comparative product. be. In the lipstick according to the present invention, "slippage" does not occur until the entire lipstick breaks.

[Table] Note *: “Slippage” does not occur even when the lipstick breaks.
As can be seen from the above experimental examples, the lipstick of the present invention can greatly increase its strength against "slippage" and "breakage," and since the bonding surface has a gentle wave surface, conventional technology can be used to manufacture it. The process is also easy.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of the embodiment. Figure 2 is its front view. FIG. 3 is a sectional view taken along line xx' in FIG. 2. FIG. 4 is a plan view of FIG. 1. FIG. 5 is a front view schematically showing a test method showing the effects of the present invention (the base joint surface is parallel to the paper surface). FIG. 6 is a plan view of FIG. 5 (the base joint surface is perpendicular to the paper surface). FIG. 7 is a perspective view of a comparative example. 8th
The figure is its front view. FIG. 9 is a sectional view taken along line xx' in FIG. 8. FIG. 10 is a plan view of FIG. 7. DESCRIPTION OF SYMBOLS 1... Base, 2... Base, 3... Base boundary line, 4... Convex part, 5... Concave part, 6... Rheometer adapter, 7... Lip stick, 8...
…Retention.

Claims (1)

[Scope of utility model registration request] Lipsticks are composed of columnar bases of two different colors that are divided along the axis from the top, and the boundary line of their joint surfaces appears as a gently wavy base boundary line.The joint surfaces of these bases are aligned with the axis of the lipstick. It is characterized by being composed only of gentle wave surfaces along the lipstick, and the joint surface has a wavy uneven surface that fits into each other, and the radii of the wavy line and the wave surface are the same and almost match the radius of the lip stick. and lipstick.