JPS6340004Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a marking formed on the side of the tire during tire vulcanization, commonly known as a black mark, in which the tire name, etc., is expressed by irregularities.

A conventional display of this kind is, for example, when displaying the symbol "D" as shown in Figure 1a, the whole is raised by a height h above the tire surface 1, as shown in Figures a and b, and A bent line 2 that follows the outline of the display and a straight bent line 3 that is spaced at appropriate intervals inside the outline are raised by a height i to make the surface of the bracket letter uneven and change the lettering. be. Such a bracket with a vent line is prone to surface damage due to bareness, that is, residual gas. The higher the letter height, the more this tends to happen. Therefore, a vent hole must be provided in the mold, and in this case, there is a possibility that the bracket itself may be scraped when cutting the spew, which poses problems in terms of workability and product price. Further, since the conventional bracket has a convex shape as a whole, there was a problem in that the volume of the rubber of the sidewall became correspondingly large.

The purpose of this invention was to solve the above problem, and its main feature is that in a tire that has letters, symbols, etc. displayed on the side using uneven surfaces, the display can be placed on or from the top. It is formed by a concavo-convex surface in which rounded convex stripes extending from the side surface and rounded concave grooves at the bottom or from the bottom to the side surfaces are arranged alternately in parallel, and the height of the convex stripes and the depth of the concave grooves are adjusted by adjusting the height of the convex stripes and the depth of the concave grooves. This is a display on the side of a tire where the width of the strip and the width of the groove are the same or almost the same.

The roundness of the convex stripes and the roundness of the concave grooves serve as countermeasures against bare molding, thereby eliminating the need to provide vent holes in the mold. In addition, the indication of this configuration is that if the amount of protrusion of the above-mentioned protrusions and the amount of indentation of the groove are the same based on the surface of the part without indication, the volume of the sidewall rubber according to the indication is not indicated. It can be made equivalent to a part.

An embodiment of this invention will be described below with reference to the drawings. In FIGS. 2a and 2b, 10 represents the symbol "D". The display 10 is composed of linear protrusions 11 and grooves 12 arranged in parallel and alternately. As seen in Figure b, the protrusions 11 are
Width w ₁ is 2.0mm, radius r ₁ from top plane to side
It has a roundness, its dimensions are 0.5 mm, and the height t from the unmarked tire surface 13 is 1.0 mm. In addition, as shown in the same figure b, the concave groove 12 has a width w ₂ of 2.0 mm, a rounded shape with a radius r ₂ from the bottom plane to the side surface, and its dimensions are 0.5 mm, and a depth d from the tire surface 13 not shown. is 1.0mm.

The display of the tire side part with such a structure is formed by a tire mold, but each protrusion 1
1 Since the groove 12 is rounded and has no corners, no bareness occurs. Therefore, there is no need for a vent hole in the mold for this part, and there is no need to cut a spout. Although the display 10 itself has a slightly uneven surface, it is a collection of streaks formed by grooves and protrusions, and is clearly different from the area without a display, so that it can be observed as a clear display. In addition, in this embodiment, the height t and width w ₁ of the protrusion 11 are equal to the depth d and width w ₂ of the groove 12, so the amount of protrusion and the amount of indentation are equal, and the display The volume of sidewall rubber in the area without and the area with the mark is the same, so it does not affect tire balance at all.

In the above embodiment, the width and height of the protrusion 11 and the width and depth of the groove 12 are the same, but in some cases, each dimension may be different, and in that case, the amount of protrusion and the amount of depression It is desirable that the amounts are approximately equal. However, if the amount of depression or protrusion is small, a cross-sectional shape as shown in FIG. 3 may be used.
Further, the convex and concave lines may have a curved shape, a zigzag shape, etc. other than a straight line. Incidentally, the uneven stripes can be formed by leaving only the letter portion in the mold and performing NC processing.

As described above, according to this invention, it is possible to clearly display the tire side part, and there is no need for a vent hole in that part of the mold, and the volume of the sidewall rubber can be made equal. The display can also be adjusted.

[Brief explanation of the drawing]

Fig. 1 shows an example of a conventional tire side display; a is a front view, b is a partially enlarged cross-sectional view taken along line A-A of a; Fig. 2 is an embodiment of this invention, a is a front view, b FIG. 3 is a partially enlarged sectional view taken along line B--B of FIG. 3, and FIG. 3 is a sectional view corresponding to FIG. 10...display, 11...convex strip, 12...concave groove,
13... Surface of the unmarked part of the tire, r ₁ , r ₂
...Round radius.

Claims (1)

[Scope of utility model registration request] In a tire that has uneven markings such as letters, symbols, etc. on the side part, the markings are alternately arranged in parallel between rounded ridges on the top or from the top to the sides and rounded grooves on the bottom or from the bottom to the sides. The tire side portion is formed by an uneven surface arranged in a pattern, and the height of the protrusions and the depth of the grooves are the same or almost the same, and the width of the protrusions and the width of the grooves are the same or almost the same. display.