JPS61125375A - Safety 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] (Industrial Application IF) The present invention improves the shaving quality by shaving through the synergistic effect of the cutting and shaving points of the inner cutter in combination with the inner cutter and the outer cutter. It concerns safety razors.

(Prior Art) Conventional safety razors shave hair only by the cutting action of the blade, so the blade wears out quickly and must be replaced with a new one after several uses. Therefore, it was extremely uneconomical.

＜*Problems to be Solved by Akira） In view of the above-mentioned problems, the present invention aims to remove hairs by a cutting action when the sharpness of the inner blade is good, and mainly by a shearing action when the sharpness of the inner blade has deteriorated. The main purpose of this design is to improve the shaving quality and extend the life of the inner blade.

(Means for Solving the Problems) The present invention has an inner cutter fixedly attached to a holder, and an outer cutter having an arcuate cross section in which numerous hair insertion holes larger than the thickness of the hair are bored in a thin metal plate. The outer cutter is rotatably attached to a holder with the inner peripheral surface of the outer cutter brought close to the cutting edge of the inner cutter, and is provided with a biasing means for constantly biasing the outer cutter downward. Alternatively, the inner cutter is fixed and attached to a holder, and numerous barb insertion holes larger than the thickness of the barb are bored in a thin metal plate to form a cylindrical outer cutter, and the cutting edge of the inner cutter is The outer cutter is rotatably attached to a holder in close proximity to the inner peripheral surface of the outer cutter.

(Function) When you move the holder downward with the outer blade against the skin,
The outer cutter rotates upward due to the friction between the outer cutter and the skin, causing relative movement between the outer cutter and the inner cutter.

Due to this relative movement, the hairs that have entered the inside through the numerous hair insertion holes of the outer cutter are cut or sheared by the inner cutter. After the outer cutter has rotated upward by a predetermined amount, when the outer cutter is released from the skin, the outer cutter is rotated downward and returned to its original position by a biasing means such as a tension spring.

Further, in the case of using a cylindrical outer cutter, when the outer cutter is placed against the skin and the holder is moved downward, the outer cutter rotates upward and a relative movement occurs between the outer cutter and the inner cutter. The whiskers that have entered the interior through the whisker insertion hole of the outer cutter are cut or sheared by the inner cutter.

(Example) An example of the first invention described in claim 1 is shown in FIGS. 1 to 3.

An inner cutter 2 is attached to the tip of the holder l. The outer cutter 3 has an arcuate cross-section with numerous sink insertion holes 4 drilled in a thin metal plate, and plates 6 are provided in series at both upper and lower ends for attachment to a rotating tool 6. There is. The cylindrical part 5a provided at the base end of the rotation A5 is the shaft part 11 provided in the holder 1.
It is rotatably fitted into the The outer cutter 3 is attached to the tip of the rotating tool 6. The inner peripheral surface of the outer cutter 3 is close to the cutting edge of the inner cutter 2.

Further, a tension spring serving as a biasing means is stretched between the holder 1 and the outer cutter 3. As a result, the outer cutter 3 is always urged downward.

If the inner blade 2 has good sharpness, #l! Figure 1 (
As shown in (a), the beard is shaved in the same manner as with a general razor without using the outer blade 3.

Also, if the sharpness of the inner blade 2 decreases, the outer blade 3'f:
When the outer cutter 3 is attached to the rotation A5 and the holder 1 is moved downward with the outer cutter 3 facing the skin S, the outer cutter 3 rotates upward due to the friction between the outer cutter 3 and the skin S, and the outer cutter 3 and the inner A relative movement occurs between the blade 2 and the blade 2. Due to this relative movement, the whiskers 8 that have entered the outer cutter 3 through the numerous whisker insertion holes 4 are cut or sheared by the inner cutter 2.

Then, after the outer cutter 3 has rotated upward by a predetermined amount, when the outer cutter 3 is released from the skin S, the outer cutter 3 is rotated downward by the tensile action of the tension spring 7 and returns to its original position. What is necessary is to apply the outer cutter 3 to the skin B again and repeat the above operation.

Embodiments of the second invention described in claim 2 are shown in FIGS. 4 and 5.

The outer blade 11 has countless hair insertion holes IJ in a thin metal plate that are larger than the thickness of the hair! It has a cylindrical shape. This outer cutter 11 is rotatably attached to a holder 13, and two inner cutters 1 are attached to the inner cutter attachment bias 13& of the holder 13.
4 are attached at predetermined intervals. The cutting edge of the inner cutter 14 is close to the inner peripheral surface of the outer cutter 11. The outer cutter 11 includes only the inner cutter 14, and when shaving, this inner cutter 14'
f. A window 16 is provided for exposure.

Then, when the outer cutter 11 is placed against the skin and the holder 13 is moved downward, the outer cutter 11 rotates upward due to contact with the skin, and a relative movement occurs between the outer cutter 11 and the inner cutter 14. . Due to this relative movement, the hair that has entered the inside of the outer cutter 11 through the hair insertion hole 12 is smoothly shaved due to the synergistic effect of the cutting and shearing of the inner cutter 14.

When the inner cutter 14 has good sharpness, the inner cutter 14 is exposed through the window 15 provided in the outer cutter 11, and the outer cutter 11 is fixed to the inner cutter removing part 13 & of the holder 13, and the inner cutter 14
You can also shave your beard directly.

In addition to the configuration of the embodiment described above, the one shown in FIG. Part 1
3 & are sequentially moved to position a new inner cutter 16 at the use position.

Furthermore, in both the first and second inventions, the sixth invention
As shown in the figure, when cutting or shearing whiskers, the position of the cutting edge of the inner cutter 2 is inclined with respect to the longitudinal direction of the outer cutter 3 or the fine direction of the cylindrical outer cutter 11. A so-called pulling action may also be applied to the shaver to improve the shaving quality. Furthermore, by applying slight vibrations to the outer cutters 3 and 11, the number of metals that bring the whiskers 8 into contact with the ends of the whisker insertion holes 4 and 1z may be increased, thereby making it easier to shear the whiskers.

Further, in any of the inventions described above, the cutting edge angle of the inner cutter is set in a range of 200 to 80 degrees.

In the case of blade materials with high hardness, wear resistance, and high toughness such as cemented carbide, 2-7 laminate, and 2-7 laminate, the smaller the cutting edge angle, the better the cutting and shearing effects will be. be. On the other hand, ceramics with low toughness or high toughness but low hardness! In the case of rutinite-based blade material,
The angle of the cutting edge must be increased to prevent wear and tear on the cutting edge. That is, the cutting edge angle of the inner cutter must be determined based on the physical properties of the blade material. However, basically, it is desirable to configure the inner blade with a blade material that has high wear resistance and high strength (hardness, toughness), and the smaller the cutting edge angle, the lower the cutting resistance, which can be said to be better. . However, in the case of shaving with a focus on the whole area, this is not the case; instead, the angle of the blade edge should be increased to improve durability.

(Effects) The present invention shaves off hair by the synergistic effect of the cutting and shearing of the inner cutter in combination with the inner cutter and the outer cutter, so the shave quality is improved compared to the case where only the conventional cutting action is used. .

In addition, even if the sharpness of the inner blade deteriorates, it is possible to shave mainly by the piercing action of the inner blade, so
The life of the inner blade is extended.

[Brief explanation of the drawing]

Figures 1(a) and 1(b) are side views of the safety razor according to the invention @1 in its new state of use, respectively. Figure 2 is a perspective view of the outer cutter 3, and Figure 3 is the inner cutter 2. FIG. 4 is a perspective view of the main parts of the safety razor according to the second invention, and FIG. Figure 6 is a side view of the main parts of the safety razor.
3 is a diagram showing the positional relationship between an inner cutter 2 and an outer cutter 3. FIG. (Explanation of symbols of main parts) 1.13: Holder 314.16: Inner blade 3.1.1: Outer blade C, XZ: Beard insertion hole 7: Tension spring (biasing means) 8; Beard head 1 Figure $2FM Kan 3 I4FM

Claims (2)

[Claims] (1) The inner cutter is fixedly attached to the holder, and an outer cutter with an arc-shaped cross section is formed by drilling numerous barb insertion holes larger than the thickness of the barbs in a thin metal plate, and the outer cutter is attached to the cutting edge of the inner cutter. A safety razor comprising an outer cutter rotatably attached to a holder with the inner peripheral surfaces of the blades close to each other, and a biasing means for constantly biasing the outer cutter downward. (2) The inner cutter is fixedly attached to the holder, and a cylindrical outer cutter is formed by drilling numerous hair insertion holes larger than the thickness of the hair in the thin metal plate, and the cutting edge of the inner cutter is A safety razor in which the outer blade is rotatably attached to a holder with the inner peripheral surface of the outer blade close to each other.