Razor blade

Abstract

A razor movable blade, the movable blade teeth of which have a composite surface, the composite surface includes a first surface corresponding to the tooth tip, a second surface corresponding to the tooth root, and a composite section connected between the first surface and the second surface, the intersection line of the composite section and the first surface is N1, the intersection line of the composite section and the second surface is N2, the plane where N1 and N2 are located together is a composite extension surface, the surface where the tooth tip is located is an upper surface, the angle a between the first surface and the upper surface is smaller than the angle b between the composite extension surface and the upper surface, and the angle b between the composite extension surface and the upper surface is smaller than the angle c between the second surface and the upper surface. The razor movable blade can simultaneously ensure the strength and sharpness of the movable blade, and ensure that the hair has enough space to enter the razor, and is also applicable to the shearing of longer hair; the setting of the stealing groove can effectively reduce the temperature rise while ensuring the strength of the blade tooth part to the greatest extent.

Description

Technical Field

[0001] The invention relates to the technical field of shavers, in particular to a movable blade of a shaver. Background Art

[0002] When the razor is working, it cuts the hair on the human skin. A general razor includes a moving blade and a moving blade that moves relative to the moving blade. The moving blade teeth formed on the moving blade cooperate with the static blade teeth set on the static blade to cut the hair. Generally, after the hair is cut, some of it will accumulate in the gaps between the blade teeth. It generally has little impact when shaving for a short time or a small amount of hair, and it can be cleaned manually after the shaving is completed. However, if the amount of hair shaved is large and the shaving time is long, the accumulation of hair will easily increase the friction between the moving and static blades, thereby forming a high temperature rise; the accumulated hair will also form resistance to the hair to be cut entering the blade teeth, reducing the efficiency of shearing and affecting the shearing effect; in addition, the uneven accumulation of hair will also form a slight bias, causing the blade to jump. When hair enters the shaving gap, it is generally tilted away from the teeth of the moving cutter. When shaving, in order to ensure the sharpness of the blade, the slope of the moving cutter is usually increased. Although such a shaver has sufficient sharpness, in order to leave enough space for the entering hair, the root of the tooth can only be made thin. Such a design will cause the strength of the moving cutter to decrease, especially some ceramic knives. Once they fall during cleaning or installation, the moving cutter will basically be damaged. Under the same blade slope, if the root of the tooth is made thick, although the defect of insufficient strength of the teeth is avoided, it will result in insufficient space for the hair to enter, and it is not suitable for cutting longer hair. In short, the existing shavers cannot solve the above problems at the same time. Summary of the invention

[0003] In view of this, the present invention provides a razor blade with strong rigidity, low temperature rise and good shaving effect.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A razor movable blade, the movable blade having movable blade teeth, the ends of the movable blade teeth forming cutting edges for shearing with a stationary blade, the end of the movable blade teeth where the cutting edges are located being the tooth tip, the end of the movable blade teeth away from the cutting edges being the tooth root, the movable blade teeth having a composite surface facing the hair when the movable blade teeth are working, the composite surface comprising a first surface corresponding to the tooth tip, a second surface corresponding to the tooth root, and a composite section connected between the first surface and the second surface, the intersection line between the composite section and the first surface being N1, the intersection line between the composite section and the second surface being N2, the plane where N1 and N2 are located together being the composite extension surface, the surface where the tooth tip is located being the upper surface, the angle a between the first surface and the upper surface being smaller than the angle b between the composite extension surface and the upper surface, and the angle b between the composite extension surface and the upper surface being smaller than the angle c between the second surface and the upper surface.

[0006] Preferably, the composite section includes at least one curved surface or at least one flat surface.

[0007] Preferably, the angle a is ≤75°, and the angle b is ≤89°.

[0008] Preferably, 35°≤a≤55°, 36°≤b≤56°.

[0009] Preferably, the horizontal distance from the intersection line N1 to the cutting edge is L1, the horizontal distance from the intersection line N2 to the cutting edge is L, 0.5mm≤L≤2.5m, 0.3mm≤L1≤1mm.

[0010] Preferably, the horizontal distance from the intersection line N1 to the cutting edge is L1, the horizontal distance from the intersection line N2 to the cutting edge is L, and L1=0.5L.

[0011] Preferably, a material stealing groove is arranged on the upper surface, and the material stealing groove extends along the upper surface, and the depth of the material stealing groove increases from both ends of the material stealing groove to the middle of the material stealing groove.

[0012] Preferably, the cross-section of the material stealing trough along its extension direction is fan-shaped or triangular.

[0013] Preferably, the wall thickness of the blade teeth between the composite surface and the stealing groove increases from the tip of the tooth toward the root of the tooth.

[0014] Preferably, the bottom surface of the material stealing trough is composed of two intersecting first bottom surfaces and a second bottom surface, the first bottom surface tends to tilt downward from the tooth tip to the tooth heel, and the second bottom surface tends to tilt downward from the tooth tip to the tooth root.

[0015] Preferably, the bottom surface of the material stealing trough is a curved surface.

[0016] The beneficial effects of the present invention are as follows: the movable blade of the razor of the present invention ensures sufficient space for hair to enter the razor while ensuring the strength and sharpness of the movable blade, and is also applicable to the shearing of longer hair; the movable blade of the razor has a low temperature rise when working, and the setting of the stealing groove effectively reduces the temperature rise while ensuring the strength of the blade tooth part to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Attached Figure 1 A three-dimensional diagram of the moving blade of the razor of the present invention;

[0019] Attached Figure 2 for Figure 1 The enlarged view of point B in the middle;

[0020] Attached Figure 3 for Figure 1 The main view;

[0021] Attached Figure 4 for Figure 3 A cross-sectional view along the AA direction;

[0022] Attached Figure 5 is a schematic diagram for explaining L1 and L2;

[0023] Attached Figure 6-1 It is a schematic diagram of the existing cutter tooth structure, which is used for Figure 5 Make a comparison;

[0024] Attached Figure 6-2 Another structural diagram of the existing cutter teeth is shown for use with Figure 5 Make a comparison.

[0025] Reference numerals:

[0026] 1. Moving knife, 2. Moving knife seat, 3. Moving knife teeth, 4. Cutting edge, 5. Stationary knife, 6. Stationary knife teeth, 7. Tooth tip, 8. Tooth root, 9. Composite surface, 10. First surface, 11. Second surface, 12. Composite section, 13. Composite extension surface, 14. Upper surface, 15. Material stealing groove, 16. Bottom surface, 17. First bottom surface, 18. Second bottom surface. DETAILED DESCRIPTION

[0027] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] As attached Figures 1 to 5 FIG. 1 is a preferred embodiment of the rotary razor of the present invention. Figure 1 The movable knife 1 has a disc-shaped movable knife seat 2, on which movable knife teeth 3 are evenly distributed along the circumferential direction, and the ends of the movable knife teeth 3 (in the direction shown in the figure, the end is the top of the movable knife teeth 3) form a cutting edge 4 to cooperate with a stationary knife 5 for shearing. The stationary knife 5 covers the upper part of the movable knife 1, and the stationary knife 5 is provided with a stationary knife tooth portion 6 that cooperates with the movable knife teeth 3. The end where the cutting edge 4 of the movable knife teeth 3 is located is a tooth tip 7, and the end of the movable knife teeth 3 away from the cutting edge 4 is a tooth root 8. The movable knife teeth 3 have a composite surface 9 facing the hair when the movable knife 1 is working. When working, the cutting edge 4 of the movable knife teeth 3 directly faces the hair, so when the movable knife 1 rotates, a windward surface where the cutting edge 4 is located is the composite surface 9 described in the present invention. Specifically, the composite surface 9 includes a first surface 10 corresponding to the tooth tip 7, a second surface 11 corresponding to the tooth root 8, and a composite section 12 connected between the first surface and the second surface. The intersection line of the composite section 12 and the first surface 10 is N1, and the intersection line of the composite section 12 and the second surface 11 is N2. The plane where the intersection line N1 and the intersection line N2 are located together is the composite extension surface 13. The surface where the tooth tip 7 is located is the upper surface 14. Usually, when the razor is working, the upper surface 14 has at least a part of friction with the static knife. The angle a between the first surface 10 and the upper surface 14 is smaller than the angle b between the composite extension surface 13 and the upper surface 14, and the angle b between the composite extension surface 13 and the upper surface 14 is smaller than the angle c between the second surface 11 and the upper surface 14.

[0030] In the embodiment shown in the present invention, the composite section 12 includes a slope connecting the first surface 10 and a slope connecting the second surface 11. That is, the composite section 12 includes two slopes, and the two slopes intersect. The intersection line between the slope and the first surface 10 is N1, and the intersection line between the other slope and the second surface 11 is N2. In general, the plane where the intersection line N1 and the intersection line N2 are located together is the composite extension surface 13. Similarly, the angle a between the first surface 10 and the upper surface 14 is smaller than the angle b between the composite extension surface 13 and the upper surface 14, and the angle b between the composite extension surface 13 and the upper surface 14 is smaller than the angle c between the second surface 11 and the upper surface 14. Specifically, the angle a≤75°, and the angle b≤89°. Preferably, the range value of the angle a is 35°≤a≤55°, and the range value of the angle b is 36°≤b≤56°. With this arrangement, there is enough space for hair to enter, the sharpness of the blade edge 4 is ensured, and the strength of the movable knife 1 is guaranteed.

[0031] In specific implementation, the composite section 12 is not limited to that disclosed in this embodiment. Specifically, the composite section 12 can be configured to include at least one curved surface or at least one plane (inclined surface), for example, at least one inclined surface and one curved surface, or two connected curved surfaces, etc. The composite section 12 specifically includes several such planes (inclined surfaces) or curved surfaces without limitation. Figure 5 The razor blade shown is an example in which the composite section 12 is arranged as an inclined surface.

[0032] Define the horizontal distance from the intersection line N1 to the cutting edge 4 as L1, and the horizontal distance from the intersection line N2 to the cutting edge 4 as L. Specifically, 0.5mm≤L≤2.5mm, 0.3mm≤L1≤1mm. In specific implementation, the relative relationship between L1 and L can take the following value: L1=0.5L. Figure 6-1 and attached Figure 6-2 By comparison, it can be seen that after such an arrangement, there is sufficient space for hair to enter, the sharpness of the blade edge 4 is ensured, and the strength of the movable knife 1 is guaranteed at the same time.

[0033] In order to reduce the friction area between the moving and stationary knives 5 and effectively reduce the temperature rise, a material stealing groove 15 is provided on the upper surface 14 of the moving knife 1. The material stealing groove 15 extends along the upper surface 14, and the depth of the material stealing groove 15 deepens from the two ends of the material stealing groove 15 to the middle of the material stealing groove 15. The two ends of the material stealing groove 15 refer to the two ends of its extension direction. The cross-section of the material stealing groove 15 along its extension direction is roughly fan-shaped, and the formation of the fan shape is mainly due to the fact that the part of the upper surface 14 corresponding to the material stealing groove 15 is a curved surface, and the bottom surface 16 of the material stealing groove 15 is composed of two intersecting inclined surfaces. Of course, it should be noted that there should be no restriction on whether the part of the upper surface 14 corresponding to the material stealing groove 15 is a plane or a curved surface. That is to say, the portion of the upper surface corresponding to the stealing groove 15 can be set to a plane, and the plane is not necessarily a horizontal plane, but can also be an inclined plane, etc., as long as the depth of the stealing groove 15 deepens from the two ends of the stealing groove 15 to the middle of the stealing groove 15; in addition, the bottom surface of the stealing groove can be a curved surface, as long as the depth of the stealing groove 15 deepens from the two ends of the stealing groove 15 to the middle of the stealing groove 15. The above settings can increase the wall thickness of the blade teeth between the composite surface 9 and the stealing groove 15 from the tooth tip 7 to the tooth root 8. This design method not only effectively reduces the temperature rise, but also the gradually increasing wall thickness also enhances the strength of the moving blade teeth 3 as a whole. Specifically, in this embodiment, the bottom surface 16 of the stealing groove 15 is composed of two intersecting first bottom surfaces 17 and second bottom surfaces 18, the first bottom surface 17 has a downward tilting trend from the tooth tip 7 to the tooth heel 8, and the second bottom surface 18 has a downward tilting trend from the tooth tip 7 to the tooth root 8. The first bottom surface 17 and the second bottom surface 18 can both be inclined planes, or one of them can be a plane and the other can be an arcuate surface (curved surface), or both surfaces can be arcuate surfaces, as long as they have a tendency to tilt downward from the tooth tip 7 to the tooth root 8. In this way, the wall thickness of the blade teeth between the composite surface 9 and the material stealing groove 15 can increase from the tooth tip 7 to the tooth root 8. While effectively reducing the temperature rise, the strength of the blade teeth will not be reduced due to material stealing, especially the strength of the cutting edge will be less affected.

[0034] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A razor blade, the blade having blade teeth, the ends of the blade teeth forming cutting edges for cooperating with a stationary blade for shearing, characterized in that: The end of the moving tooth where the cutting edge is located is the tooth tip, and the end of the moving tooth away from the cutting edge is the tooth root. The moving tooth has a composite surface facing the hair when the moving tooth is working, and the composite surface includes a first surface corresponding to the tooth tip, a second surface corresponding to the tooth root, and a composite section connected between the first surface and the second surface. The intersection line of the composite section and the first surface is N1, and the intersection line of the composite section and the second surface is N2. The plane where N1 and N2 are located together is the composite extension surface, and the surface where the tooth tip is located is the upper surface. The angle a between the first surface and the upper surface is smaller than the angle b between the composite extension surface and the upper surface, and the angle b between the composite extension surface and the upper surface is smaller than the angle c between the second surface and the upper surface.

2. The movable blade of the razor according to claim 1, characterized in that: The composite segment includes at least one curved surface or at least one flat surface.

3. The movable blade of the razor according to claim 1 or 2, characterized in that: The angle a is ≤75°, and the angle b is ≤89°.

4. The movable blade of the razor according to claim 1 or 2, characterized in that: 35°≤a≤55°, 36°≤b≤56°.

5. The movable blade of the razor according to claim 1 or 2, characterized in that: The horizontal distance from the intersection line N1 to the cutting edge is L1, and the horizontal distance from the intersection line N2 to the cutting edge is L, 0.5 mm≤L≤2.5 mm, 0.3 mm≤L1≤1 mm.

6. The movable blade of the razor according to claim 1 or 2, characterized in that: The horizontal distance from the intersection line N1 to the cutting edge is L1, and the horizontal distance from the intersection line N2 to the cutting edge is L, where L1=0.5L.

7. The movable blade of the razor according to claim 1 or 2, characterized in that: The upper surface is provided with a material stealing groove, which extends along the upper surface, and the depth of the material stealing groove increases from the two ends of the material stealing groove to the middle of the material stealing groove.

8. The movable blade of the razor according to claim 7, characterized in that: The cross section of the material stealing trough along its extension direction is fan-shaped or triangular.

9. The movable blade of the razor according to claim 7, characterized in that: The wall thickness of the cutter teeth between the composite surface and the stealing groove increases from the tooth tip toward the tooth root.

10. The movable blade of the razor according to claim 7, characterized in that: The bottom surface of the stealing trough is composed of two intersecting first bottom surfaces and a second bottom surface, wherein the first bottom surface is inclined downward from the tooth tip to the tooth root, and the second bottom surface is inclined downward from the tooth tip to the tooth root.

11. The movable blade of the razor according to claim 7, characterized in that: The bottom surface of the material stealing trough is a curved surface.

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