JPS60122590A - Blade part of rotary electric razor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention aims to improve the sharpness of a rotary electric shaver, and provides a blade that can reliably capture and cut short, long, and curly hair.

Conventionally, the cross-sectional shape of the outer blade of rotary electric shavers is often dome-shaped, consisting of a single radius, and most of the cross-sectional radius is 30 to 35 mm. 5th FI! As shown in J, the radius of the outer blade is gentle, so almost the entire surface is in contact, making it easy to capture short hair, but with slightly longer beards and curly hair, the outer blade is moved while being pressed against the skin. There was a problem that made it difficult to introduce. Furthermore, since the circumferential speed of the inner blade is zero at the top where the skin is most strongly pressed, there is no pattern arrangement, and the range that can be used for a close shave is wasted. Also, because the skin is in contact with the entire surface of the outer blade, the pressure force is dispersed, and when you try to shave the beard that has been cut by applying the outer blade to the skin again, the pressure force of the outer blade changes and the way the outer blade is applied to the skin. Due to the strength and weakness of the pressure contact, the cutting sound continues to be heard and a close shave is not achieved, and shaving the same area over and over again results in poor shaving performance.

The present invention eliminates the above problems, and its gist is that near the outer periphery of the outer cutter, an annular convex portion mainly consisting of an arcuate curve with pores is formed, and at the center, a corner is formed on the outer periphery. A dome part is formed with a long hole arranged so as to straddle a part of the corner, and four parts are formed between the annular convex part and the dome part, and a nim part below the radius of the annular convex part is formed. By increasing the radius and arranging the top of the dome portion below the top of the annular projection, the annular projection on the outer periphery can raise the hair while inserting it into the pore and cutting it. Since it provides the most pressure contact, it is possible to get a close shave, and long hair that could not be captured by the pores of the annular convex part.

This is a new blade shape that can cut all curly hair by climbing over the annular protrusion and falling into the recess formed between the center dome and the long hole on the outer periphery of the dome.

The following is a detailed explanation based on one embodiment of the present invention. FIG. 5 is a sectional view of a conventional dome-shaped outer cutter, showing the state of contact with the skin. FIG. 1 is a sectional view of a main part of the present invention. FIG. 2 is an enlarged view of the blade portion in FIG. 1. FIG. 3 is a plan view of the outer cutter. #! FIG. 4 is a sectional view taken along line AA in FIG. 2. In each figure, ``■'' is an outer blade which is fixed to the outer blade holder ``■''.The outer blade holder ``■'' is removably screwed onto the upper part of the container ``■''. On the inner surface of the outer cutter (2), there is disposed an inner cutter body (2) which is held movably up and down by the inner cutter support (2) and which is normally pressed by a spring (2) so as to be in pressure contact with the inner surface of the outer cutter (2). The inner blade body (■) forms a cutting edge that is symmetrical with respect to the drive axis X-X of the tool body (■), and the inner blade support (■) transfers the rotational force of the motor (which is the drive source) to the blade (2). The centrifugal force that occurs when the blade is received through the cutting blade can be absorbed by the fact that the cutting blade portions having the same mass are symmetrical with respect to the axis XX.

It is also possible to provide a plurality of such inner blade bodies (2).

The outer blade ■ has an annular convex part mainly consisting of an arcuate curve near the outer periphery■
is formed into a donut shape. A dome part [phase] consisting of a single radius is formed at the center, and a corner part O is formed at the outer periphery of the dome part, and a long hole @ is formed so as to straddle the corner part O. Further, a recess O is formed between the annular convex part (2) and the dome part (phase), and the annular convex part (2) and the dome part (phase) are continuously connected and integrally formed. Further, the annular convex portion (2) is provided with a large number of pores (2). Here, I would like to explain the actual state of shaving.
When the outer blade ■ touches the entire skin, the top [phase] of the annular protrusion ■ will be the surface that makes the strongest contact.If you move the razor from the state where the outer blade ■ is in contact with the writing desk, the cross section of the annular protrusion ■ will be formed. Because R is small, the base [phase] of the annular convex part ■ does not come into contact with the skin, but is pressed with a gradually stronger force as it moves toward the top [phase], so the skin does not stretch at the base [phase]. As the beard is raised up and gradually moves to the top (phase), even some long hair can be caught and cut with zero pores. It is something that Also, long hair or curly hair becomes a dome when it goes beyond the top [phase].

It falls into the four O parts in between and is raised. Next, the beard is cut to a certain length by entering the elongated hole @ provided at part 0 of the outer circumferential corner of the dome part [phase], and then facing the next annular convex part (■), where the hair is raised in the same manner as described above and the beard is cut short. To go. Moreover, the dome part [phase] not only has elongated holes ◎ on the outer periphery, but also pores 0 may be provided inside the elongated holes. In addition, the cross-sectional radius R1 of the annular convex portion (3) is formed to be smaller than the dome portion [phase] cross-sectional radius R6 to enhance the above-mentioned raising effect, and the cross-sectional radius R3 of the dome portion 0 is formed to be large around the outer 9th circumference. The corner part 0 is located at a position where it can come into contact with the skin. Here, to discuss the specific values of R3 and 1, R1 is 3 to 10 watr (preferably 4
~6 m) gives a sufficient nap effect, and 1 is 20~40 m
m (preferably 50 to 55+wa) allows the corner part 2 to be placed in the best position relative to the skin. Also, the top part 0 of the dome part 0 is located below the top part @ of the annular convex part (■), and its depth h is formed at α2 to 1+m, so that the top part [phase] of the annular convex part (2) can be in the most pressure contact with the skin. At the same time, consideration has been given to making sure that the corner part (2) of the dome part 0 is also in a position where it can make sufficient contact with the skin. Further, as shown in FIG. 5, the blade surface of the inner cutter (2) needs to have the same cross-sectional shape R1 of the outer cutter (2), so it is necessary to form a small radius. However, if the rake and angle θ are not provided when cutting beards, the sharpness, especially the sharpness, will easily occur, so it is necessary to bend the rounded part in the direction of rotation at the root [phase].
When the inner blade ■ is bent with the angle [phase], the free end distance #lt of the inner blade ■ becomes larger, and in fact, the whiskers enter the pores 0 of the outer blade ■, and as the inner blade 0 cuts, the inner blade ■ is formed with a thin wall. Therefore, due to the cutting resistance of the whiskers, the cutting resistance causes the blade to warp toward the end side in the rotation direction, resulting in the phenomenon of flattening. Blade support ■
By using a guide wall O that guides the inner blade body (2) from the rear side in the direction of rotation as a wall, the above-mentioned bulging phenomenon is prevented. In addition, a protrusion O is formed in the center of the inner blade support ■ and is integrally protruded from the inner blade support ``0'', and the outer blade ■
It is located on the inner surface of the dome part [phase] with a minute gap,
The outer blade deforms inward in response to the pressure received from the skin, and serves to maintain good contact between the outer blade (2) and the inner blade (2). In addition, since the part that originally cuts short hair is placed on the outer periphery where the circumferential speed is high, there is less cutting resistance and a smoother cutting quality can be obtained, which also has the effect of increasing the feeling of strength.

The present invention is constructed as described above, and in order to achieve a close shave, which has been a problem in the past, the annular convex part with pores strongly contacts the skin instead of applying the entire surface of the outer blade, reducing the contact pressure. Reduces dispersion and allows for a closer shave with more even pressure. Also, with regard to catching beards, the cross-sectional radius of the annular convex portion is formed to be small to create a hair-raising effect. In terms of quick shaving, the annular convex section shaves short hair quickly and closely, and the elongated holes provided in a part of the outer corner of the dome in the center can capture long hair and curly hair. This makes it possible to shave quickly.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part of the present invention. FIG. 2 is an enlarged view of the area around the blade in FIG. 1. FIG. 3 is a plan view of the outer cutter. FIG. 4 is a sectional view taken along line AA in FIG. 1. FIG. 5 shows a conventional dome-shaped outer cutter in contact with the skin. 1...Outer blade 3...Inner blade Body 4...Inner blade support 6...Inner blade Body 9: Annular convex portion 10: Dome portion 11: Corner part 12: Long Hole 13: Concave Part 14... More than a hole Applicant Kinsha Shuho Seikosha Co., Ltd. Agent Patent attorney Tsutomu Mogami

Claims (1)

[Claims] (1) An annular convex portion whose cross section is mainly an arcuate curve is formed near the outer periphery of the outer cutter, and a dome portion whose cross section is mainly an arcuate curve is provided at the center. A blade part of a rotary electric shaver characterized in that four parts are formed between the annular convex part and the dome part. (2) A part of the corner is arranged on the outer periphery of the central dome part, and a part of the corner is arranged so as to straddle the part of the corner. A blade portion of a rotary electric shaver according to claim 1, characterized in that an elongated hole is provided in the rotary electric shaver according to claim 1. The blade portion of the rotary electric shaver according to claim 1, characterized in that R1 is increased. (4) The top portion of the central dome portion is lower than the top portion of the annular convex portion on the outer periphery. A blade portion of a rotary electric shaver according to claim 1, characterized in that the blade portion is formed as follows.