JPS6359346B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION An object of the present invention is to obtain an outer blade for a reciprocating electric shaver that improves the close contact between the outer blade and the inner blade and has good cutting ability over the entire blade surface. In recent years, electric razors have become smaller and thinner year by year in line with market needs. Especially with the change to thinner
The radius of semi-cylindrical inner blades has also been made smaller, but due to the area of contact with the skin, blades with a radius that is too small are unsuitable because it takes a long time to shave. On the other hand, due to the reduction in thickness, the mounting width A of the outer cutter inevitably becomes smaller as shown in FIG. However, the outer cutter 1, which is a thin metal plate, has a mounting width of A like this.
If you bend it strongly so that becomes unevenly distributed. That is, outer cutter 1 and inner cutter 2
The maximum pressure occurs at point B, and at the top there is a space C
occurs between the outer cutter 1 and the inner cutter 2. This space C
If the inner cutter 2 is further pushed up and supported by a spring or the like in order to fill the gap, additional pressure will be applied to point B, causing a problem in the durability of the outer cutter 1.

The present invention improves the outer cutter 1 in such a way that even if the outer cutter 1 is strongly curved, it is tensioned against the inner cutter 2 with uniform pressure without any gaps.

One example of this will be explained based on the drawings.
is a rectangular flexible outer blade made of thin metal plate.
Square-shaped mustache introduction holes 3, 3, . . . are uniformly formed on the entire surface except for the surrounding mounting portions. Each side of the hair introduction holes 3, 3, . . . has a length of approximately 0.5 mm. By the way, in the outer cutter 1 of the present invention, in addition to the hair introduction holes 3, 3, there are provided strip-shaped regions 4, 4 having a certain width F on both sides of a portion slightly away from the longitudinal center line N of the outer cutter 1. , a large number of small holes 5, 5, . . . are bored. The small holes 5, 5... can be formed at the same time as the whisker introduction holes 3, 3... by an electroforming method based on a photo printing method. To explain this point in more detail, as shown in FIG.
Bands 4, 4 of a certain constant width F, F with D as the center
Inside, small holes 5, 5, . . . having a diameter of 30 μm to 80 μm are formed in the bone portion between the whisker introduction holes 3. The density of the small holes 5, 5, . . . decreases as the distance from the band center line D increases. Further, the size of the small holes 5, 5, . . . is so small that no hair can be introduced. In this way, outer blade 1
When a large number of small holes 5, 5, . Therefore, the outer cutter 1 can be easily bent along the inner cutter 2 as shown in FIG. 2, and a uniform contact pressure can be obtained over the entire blade surface. Therefore, it is possible to obtain good sharpness over the entire blade surface, and at the same time, the durability of the outer blade is improved. The zones 4, 4 are the outer blade 1
The width F of these zones 4 and the distance l from the center line N are the same as the inner cutter 2.
It changes from time to time depending on the radius of the inner cutter 2, and in short, it may be determined in a band shape centered on the point where the pressure at the time of contact with the inner cutter 2 is expected to be maximum.

As described above, in the outer cutter of the reciprocating electric shaver according to the present invention, a large number of small holes are formed along with hair introduction holes in bands of a certain width, each spaced apart from the longitudinal center line. . Therefore, some portions of this small hole are weaker than other portions. Therefore, when the outer blades of razors, which have tended to have thinner bodies in recent years, have their outer blades extended in an arched shape, the degree of curvature becomes stronger because the installation width is narrowed, but even if this is done, the inner blades It can be bent naturally along the blade surface of the blade, and there is no phenomenon such as the creation of a space where the outer cutter and the inner cutter do not contact each other, or the occurrence of places where the outer cutter and the inner cutter do not come in contact with each other, or where they hit too hard. No matter where you touch the blade, the contact pressure with the inner cutter is uniform and good sharpness is consistently obtained. Further, since large blade pressure is not applied to any part of the outer cutter, the durability of the outer cutter is improved, and other great effects are achieved.

The density of the small holes in each zone is made smaller as the distance from the center of the zone increases, which has the effect of suppressing deterioration in the strength of the outer cutter due to the formation of a large number of small holes.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and Fig. 1 is a cross-sectional view of the blade to explain the disadvantages when installing the conventional outer cutter, and Fig. 2 is a sectional view of the improved outer cutter installation state using the outer cutter of the present invention. 3 is a plan view of the outer cutter of the present invention, FIG. 4 is an enlarged view of section G in FIG. 3, and FIG. 5 is a sectional view of the outer cutter. 2...Inner blade, 1...Outer blade, F...Constant width, 4,
4...band, 3...beard introduction hole, 5...small hole.

Claims (1)

[Claims] 1 In a device equipped with an inner cutter and an outer cutter stretched in an arch shape, a hole having a diameter of 30 μm to 80 μm is provided along with the hair introduction hole in a certain width zone spaced apart from the longitudinal center line of the outer cutter. A reciprocating electric shaver characterized in that a large number of small holes are formed, and the density of the small holes becomes smaller as the distance from the center of the zone increases.