Hair cut unit of reciprocation type electric shaver

Abstract

To provide a hair cut unit of a reciprocation type electric shaver.SOLUTION: A hair cut unit of a reciprocation type electric shaver includes an outer blade, an inner blade, a support, and a holder. The outer blade includes an outer blade arc-shaped wall and two opposite outer blade long walls, wherein the support supports the inner blade, and the holder includes two opposite holding walls. The outer blade long walls are provided with follow holes, at least the one support penetrates through the follow holes, and the outer blade long walls are movable along a support penetrating through the follow holes. When the cut unit receives non-uniform pressure from skin, the outer blade arc-shaped walls follow the moving outer blade long walls, can include the inner blade without being deformed, and accordingly can maintain high hair cut efficiency even at the time of actual use.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to the technical field of reciprocating electric shavers, and in particular to a hair-cutting unit of a reciprocating electric shaver. [Background technology]

[0002] In a reciprocating electric shaver, the outer blade is a very thin, easily deformed sheet with many small holes, and the bent outer blade wraps the inner blade, which is pressed against the outer blade by the action of spring pressure and reciprocates along the common contact surface with the outer blade. Hair that extends through the small holes to the common contact surface is cut, and hair that extends outside the common contact surface is not cut because the inner blade and the outer blade are separated. When there is no pressure from the skin, the inner blade and the outer blade maintain an ideal common contact surface, but in actual use, the skin is always applying pressure to the inner blade and the outer blade from all directions. When the pressure from the skin becomes uneven, the outer blade deforms because it is very thin, and the inner blade becomes displaced due to the gap with the adjacent parts, leading to a change in the common contact surface between the inner blade and the outer blade. Therefore, the efficiency of hair cutting is determined by the size of the common contact surface between the inner blade and the outer blade when it is subjected to uneven skin pressure, and the larger the common contact surface, the higher the efficiency of hair cutting, or the lower the efficiency.

[0003] In conventional hair-cutting units, the outer blade is fixed to the holder by welding or riveting, so it cannot move relative to the holder, and the gap between the inner blade and the holder is large. Due to uneven pressure from the skin, the inner blade will have a large tilt and displacement due to the large gap between the holder and the inner blade, and the outer blade will be deformed because it is fixed to the holder and cannot move. The deformed part of the outer blade will move away from contact with the inner blade, the common contact surface will be small, and the efficiency of hair cutting will be poor. Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present invention is to provide a hair-cutting unit of a reciprocating electric shaver that can maintain high hair-cutting efficiency even when subjected to uneven pressure from the skin. [Means for solving the problem]

[0005] In order to achieve the above object, the hair-cutting unit of a reciprocating electric shaver according to the present invention comprises an outer blade, an inner blade, a support, and a holder, the outer blade comprises an outer blade arc-shaped wall and two opposing outer blade long walls, the support supports the inner blade, the holder comprises two opposing holding walls, the outer blade long walls are provided with following holes, at least one of the supports passes through the following holes, and the outer blade long walls are movable along the support passing through the following holes.

[0006] The retaining wall is provided with a support hole, and at least six of the supports extend through the support hole.

[0007] The retainer is provided with a connection portion for connecting two opposing retaining walls, the connection portion and the retaining walls both being metal sheets.

[0008] The connection portion is bent, the two opposing retaining walls are non-parallel, and the distance between the retaining walls closer to the connection portion is greater than the distance between the retaining walls further from the connection portion.

[0009] A protrusion is provided on the retaining wall, the outer cutter long wall abuts against the protrusion, and the outer cutter long wall is spaced from the support hole.

[0010] The support has an end portion and a middle portion, the end portion being capable of passing through the support hole, but the middle portion being unable to pass through the support hole.

[0011] The support is made of metal and has a cylindrical shape with the end and middle portions having different diameters. Effect of the Invention

[0012] The hair-cutting unit of the reciprocating electric shaver according to the present invention has an advantage that it can maintain high hair-cutting efficiency even when it is subjected to uneven pressure from the skin during actual use. [Brief description of the drawings]

[0013] In order to more clearly explain the embodiments of the present invention, the drawings necessary for the explanation of the embodiments will be briefly described below. [Figure 1] FIG. 2 is a schematic view of an outer cutter according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic diagram of a support in one embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic diagram of a holder in one embodiment of the present invention. [Figure 4] FIG. 2 is a schematic diagram of an inner cutter according to an embodiment of the present invention. [Diagram 5] FIG. 2 is a cross-sectional view according to one embodiment of the present invention. [Figure 6] FIG. 2 is an exploded view according to one embodiment of the present invention. [Figure 7] FIG. 2 is a partial cross-sectional view according to one embodiment of the present invention. [Figure 8] FIG. 2 is a cross-sectional view of the holder in the embodiment of the present invention when not attached. [Figure 9] FIG. 2 is a cross-sectional view showing only a support body and a holder in one embodiment of the present invention. [Figure 10] FIG. 2 is a schematic diagram showing only an outer cutter, a support body, and an inner cutter in one embodiment of the present invention. [Figure 11] FIG. 11 is a schematic diagram of the case where the object shown in FIG. 10 is subjected to non-uniform pressure from the skin. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] Specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0015] As shown in FIG. 1, in this embodiment, the outer cutter 1 is a metal foil, which is provided with eight following holes 11, one outer cutter arc-shaped wall 12, and two opposing outer cutter long walls 13.

[0016] 2, the support 2 in this embodiment is a metal member having one middle portion 21 and two end portions 22. The middle portion 21 and the end portions 22 are both cylindrical, and the diameter of the middle portion 21 is larger than the diameter of the end portions 22.

[0017] 3, the holder 3 in this embodiment has a connection portion 31 and two opposing holding walls 32. Eight support holes 33 are provided in the holding wall 32, and a protrusion 34 is provided in the holding wall 32, all of which are made of metal sheets, and the connection portion 31 is bent into a U-shape.

[0018] As shown in FIG. 4, the width of the inner blade in this embodiment is H.

[0019] FIG. 5 is a cross-sectional view according to this embodiment, FIG. 6 is an exploded view of this embodiment, and FIG. 7 is a partial cross-sectional view of this embodiment. This embodiment includes one outer cutter 1, four supports 2, one holder 3, one inner cutter 4, and two springs 5. Both ends of the four supports 2 pass through eight following holes 11 provided in the outer cutter long wall 13, and the width of the following holes 11 is slightly larger than the diameter of the intermediate portion 21 so that the outer cutter long wall 13 can move along the intermediate portion 21. Next, the ends 22 of the four supports 2 pass through eight support holes 33 in the retaining wall 32, and the end face of the intermediate portion 21 abuts against the retaining wall 32. The outer cutter long wall 13 is pressed against the protruding portion 34 of the retaining wall 32 so as to move away from the support holes 33, and this prevents the outer cutter long wall 13 from being pinched in the gap between the intermediate portion 21 and the retaining wall 32 when it moves along the intermediate portion 21. The inner cutter 4 is disposed between the two outer cutter long walls 13, and the inner cutter 4 is pressed against the outer cutter arc-shaped wall 12 by the two springs 5.

[0020] 8 is a cross-sectional view of this embodiment when the holder 3 is not attached. After the connection portion 31 is bent, the two opposing retaining walls 32 become non-parallel, and the distance between the two retaining walls 32 is greater in the region closer to the connection portion 31 than in the region farther from the connection portion 31. As shown in the figure, the minimum distance L1 between the protrusions 34 is smaller than the width H of the inner blade 4.

[0021] FIG. 9 is a cross-sectional view showing only the support 2 and the holder 3 in this embodiment. After the end 22 of the support 2 penetrates the support hole 33 of the holder wall 32, the diameter of the middle part 21 is larger than the diameter of the support hole 33, so the two holder walls 32 are spread by the support 2, and the minimum distance L2 between the protrusions 34 is slightly larger than the width H of the inner blade 4. Therefore, by controlling the length of the middle part 21, the gap between the inner blade 4 and the two protrusions 34 can be controlled. If the gap is small enough, not only can the inner blade 4 reciprocate without hindrance, but also the inclination and displacement of the inner blade 4 can be sufficiently small even under uneven pressure from the skin. In this embodiment, since both the support 2 and the holder 3 are made of metal, the rigidity can be increased by welding.

[0022] 10 is a schematic diagram showing only the outer blade 1, the support 2 and the inner blade 4 in this embodiment, and as shown in the figure, both ends of the support 2 are respectively penetrated by the following holes 11. The width of the following holes 11 is slightly larger than the diameter of the middle part 21, so that the outer blade long wall 13 can move along the middle part 21, and the moving direction is up and down in this figure. This figure shows that the cutting unit is not subjected to pressure from the skin, and the inner blade 4 and the outer blade arc-shaped wall 12 have an ideal common contact surface 101.

[0023] Fig. 11 is a schematic diagram of the case where the one shown in Fig. 10 is subjected to uneven pressure from the skin. As shown in the figure, pressure F>f occurs, and at this time the inner blade 4 is slightly tilted and displaced, and the outer cutter long wall 13 moves along the middle part 21, and in this figure the movement direction is downward. The outer cutter long wall 13 on the left side moves a small amount, and the outer cutter long wall 13 on the right side moves a large amount, so the outer cutter arc-shaped wall 12 follows the moving outer cutter long wall 13 and can wrap the inner cutter 4 without deformation. The common contact surface 101 between the inner cutter 4 and the outer cutter arc-shaped wall 12 does not become smaller, so high hair-cutting efficiency can be maintained. [Explanation of symbols]

[0024] 1 Outer blade 11 Follow-up hole 12 Outer blade arc wall 13 Outer blade long wall 2 Support 21 Middle section 22 End 3 Holding body 31 Connection 32 Retaining wall 33 Support hole 34 Convex 4 Inner blade 101 Common contact surface

Claims

1. The blade includes an outer blade, an inner blade, a support, and a holder. The outer cutter includes an outer cutter arc-shaped wall and two opposing outer cutter long walls; The support supports the inner blade, The retainer comprises two opposing retaining walls; The outer cutter long wall is provided with a tracking hole, at least one of the supports passes through the tracking hole, and the outer cutter long wall is movable along the support passing through the tracking hole. The hair cutting unit of a reciprocating electric shaver is characterized by:

2. The retaining wall is provided with a support hole, and at least one of the supports passes through the support hole.

2. The hair cutting unit of a reciprocating electric shaver according to claim 1.

3. The retainer is provided with a connection portion for connecting two opposing retaining walls, the connection portion and the retaining walls being both metal sheets.

2. The hair cutting unit of a reciprocating electric shaver according to claim 1.

4. The connection portion is bent, the two opposing retaining walls are non-parallel, and the distance between the retaining walls closer to the connection portion is greater than the distance between the retaining walls farther from the connection portion.

4. The hair cutting unit of a reciprocating electric shaver according to claim 3.

5. A protrusion is provided on the retaining wall, the outer cutter long wall abuts against the protrusion, and the outer cutter long wall is spaced from the support hole.

2. The hair cutting unit of a reciprocating electric shaver according to claim 1.

6. The support has an end portion and a middle portion, the end portion being capable of passing through the support hole, but the middle portion being incapable of passing through the support hole.

2. The hair cutting unit of a reciprocating electric shaver according to claim 1.

7. The support is made of metal and has a cylindrical shape with the end and middle portions having different diameters.

7. The hair cutting unit of a reciprocating electric shaver according to claim 6.

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