razor blades

Abstract

The present invention provides a razor blade, comprising a blade and a blade holder. The blade has a cutting portion and a connecting portion, the cutting portion forming cutting teeth, the connecting portion being connected to the blade holder, the blade and the blade holder being fixedly connected by a snap, and at least a portion of the connecting portion of the blade and the blade holder being elastically limited. The razor blade of the present invention solves the problem of difficulty in controlling the degree of assembly during blade assembly, reduces relative movement between the blade and the blade holder under non-external forces caused by a loose fit, avoids blade vibration, ensures the stability of the shearing surface during shearing operations, forms an effective shearing surface between the moving blade and the stationary blade, and improves shearing efficiency and user experience.

Description

Technical Field

[0001] The present invention relates to a blade for a hair cutting (shaving) appliance. Background Art

[0002] CN205238089U discloses a fixed blade and blade assembly for a hair cutting device. The blade assembly includes a fixed blade and a movable cutting blade. The movable cutting blade includes a toothed leading edge. The movable cutting blade is movably disposed within a guide slot defined by the fixed blade, such that during relative movement between the movable cutting blade and the fixed blade, the at least one toothed leading edge of the movable cutting blade cooperates with corresponding teeth of the fixed blade to cut hair caught in the cut. The movable cutting blade is restrained by the fixed blade and a retaining portion. Typically, a movable blade is secured to a support base, which is secured to the support base via a snap-fit connection. The snap-fit connection between the movable blade and the support base requires high dimensional accuracy. If the clip is too tight, the blade may deform, affecting the cutting effect. If the clip is too loose, the blade may not cut properly or may not cut well (e.g., hair pulling or blade jumping), or may produce high noise levels during the shaving operation, making production control difficult. Summary of the Invention

[0003] In view of this, the present invention provides a razor blade that is not prone to pulling hair, has high cutting efficiency, and is low in noise.

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

[0005] A razor blade comprises a blade and a blade holder, the blade having a shearing portion and a connecting portion, the shearing portion forming cutting teeth, the connecting portion being connected to the blade holder, the connecting portion comprising two connecting walls arranged in parallel, the shearing portion being connected between the two connecting walls, the blade holder having two side walls opposite to the connecting walls, the two connecting walls being supported on the outsides of the two side walls, the blade being connected and fixed to the blade holder by means of a snap, and at least a portion of the connecting portion of the blade and the blade holder being provided with an elastic connection limiter.

[0006] Furthermore, the blade or the blade holder has an elastic structure, and the elastic structure has an elastic force perpendicular to the shearing direction so that the blade and the blade holder form an elastic connection.

[0007] Furthermore, one of the blade or the blade holder is provided with a snap groove, and the other of the blade or the blade holder is provided with a snap portion connected to the snap groove, and the elastic structure is provided in the snap groove or the snap portion.

[0008] Furthermore, one of the blade or the blade holder is provided with a positioning groove, and the other of the blade or the blade holder is provided with an elastic structure cooperating with the positioning groove, and the elastic structure has an elastic part capable of accumulating elastic force in the perpendicular shearing direction.

[0009] Furthermore, one of the blade or the blade seat is provided with a positioning groove, and the other of the blade or the blade seat is provided with an elastic structure that cooperates with the positioning groove, and the material of the elastic structure is an elastic material.

[0010] Furthermore, the connecting portion of the blade includes two connecting walls arranged in parallel, the shearing portion is connected between the two connecting walls, the blade seat and the connecting wall are snap-connected, the positioning groove is formed at the bottom of the connecting wall of the blade, the elastic structure is arranged on the blade seat, and the blade is elastically supported on the elastic structure through the positioning groove.

[0011] Furthermore, the elastic structure has a relatively protruding portion, and the positioning groove is in elastic limiting contact with the protruding portion.

[0012] Furthermore, the elastic structure extends along the shear direction, and the elastic structure includes a connecting end and an elastic supporting end, the connecting end is connected to the knife seat, the elastic supporting end is away from the connecting end, and the protrusion is located at the elastic supporting end, and the protrusion protrudes relative to the elastic supporting end in the perpendicular shear direction.

[0013] Furthermore, the cross section of the blade in the perpendicular shearing direction is U-shaped, and the connecting portion is connected in an arc shape between two connecting walls.

[0014] Furthermore, the positioning groove has an opening, a support portion opposite to the opening and elastically connected to the elastic structure, two groove side surfaces oppositely arranged and connected between the opening and the support portion, wherein at least one of the groove side surfaces is an inclined surface so that the diameter of the positioning groove gradually decreases from the opening to the support portion.

[0015] Furthermore, an intermediate positioning structure is provided between the knife seat and the blade, and the intermediate positioning structure limits the relative displacement of the blade and the knife seat along the shearing direction.

[0016] Furthermore, the connecting portion of the blade and the blade seat form a planar fit at least partially along the shearing direction.

[0017] Furthermore, a support and limiting structure is provided between the blade and the blade holder, and the support and limiting structure has a plane in close contact with the blade or the blade holder, or the part in close contact with the blade or the blade holder is in the same plane.

[0018] The beneficial effects of the present invention are as follows: the razor blade of the present invention solves the problem of difficulty in controlling the assembly degree during the assembly of the blade, reduces the relative movement between the blade and the blade holder under non-external force caused by loose fit, avoids the jumping of the blade, ensures the stability of the shearing surface during the shearing operation, ensures that an effective shearing surface is formed between the moving blade and the stationary blade, and improves the shearing efficiency and user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

[0020] Attachment Figure 1 It is a three-dimensional view of the razor blade of the present invention.

[0021] Attachment Figure 2 This is a perspective exploded view of the razor blade of the present invention.

[0022] Attachment Figure 3 for Figure 2 The enlarged view at point A shows the specific state of the elastic structure.

[0023] Attachment Figure 4 for Figure 2 The enlarged view of point B in the middle shows the specific state of the positioning groove. DETAILED DESCRIPTION

[0024] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0025] It should be noted that when a component is referred to as being "fixed to" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may also be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may also be a central component. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0026] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0027] The present invention will be further described below with reference to the accompanying drawings.

[0028] The present invention provides the following technical solutions:

[0029] As attached Figures 1 to 4 The figure shows a preferred embodiment of the razor blade of the present invention. Specifically, the razor blade includes a blade 1 and a blade holder 2, the blade 1 has a cutting portion 11 and a connecting portion 12, the cutting portion 11 forms a cutting tooth 3, the connecting portion 12 is connected to the blade holder 2, the blade 1 and the blade holder 2 are connected and fixed by a snap, and there is at least a partial elastic connection limit between the connecting portion 12 of the blade 1 and the blade holder 2. There is no restriction on the shape of the cutting tooth 3. The cutting tooth 3 can be formed only in the cutting portion 11, or in both the cutting portion 11 and the connecting portion 12; of course, the cutting tooth 3 can also be provided only in the connecting portion 12 according to actual needs. In other words, it is not necessary to provide the cutting tooth 3 on the cutting portion 11. This is just a common name for the various parts on the blade 1, and no restriction can be made therefrom.

[0030] The blade 1 and the blade holder 2 are connected and fixed by means of a buckle. If the buckle structure is set too tightly, it is easy for the blade 1 to be locally deformed (for example, it may become concave-convex or warped) at the connection point of the buckle due to being too tightly locked (the mutual force between the blade 1 and the blade holder 2 is too large), which in turn leads to abnormal shaving sharpness, excessive local temperature rise of the blade 1, and unsatisfactory sensory experience and poor shaving effect during the shaving process. After long-term use, the blade 1 will be permanently deformed and cannot be restored. On the contrary, if the buckle is too loose, the blade 1 will easily shake during the shearing operation due to the entanglement of the hair and the interaction between the blades, and noise will be generated. This shaking (or shaking) will also increase the temperature rise of the blade 1. The "elastic connection limit" means that the connection and fixation between the blade 1 and the blade holder 2 is elastic. For example, an elastic material can be provided at the connection between the blade 1 and the blade holder 2 (the portion in contact with the limit), or an elastic structure 8 can be provided at the connection between the blade 1 and the blade holder 2. The provision of such elastic material or elastic structure 8 is required to ensure that the blade 1 and the blade holder 2 have an elastic connection that is in a continuously close contact state. After such a provision, the snap fit between the blade 1 and the blade holder 2 can be in a loose fit state, and then the elastic connection forms a limit to the connection between the blade 1 and the blade holder 2, ensuring that the blade 1 and the blade holder 2 can fit closely together without being too tight. In order to avoid the buckle being too tight, the buckle between the blade 1 and the blade holder 2 generally has a relative movement gap between the two at the location of the buckle connection; and generally, this movement gap is not parallel to the movement direction of the blade 1. Therefore, the elastic force of the elastic structure 8 described in the present invention is to compensate for the relative movement between the blade 1 and the blade holder 2 caused by the buckle margin. The elastic force of the elastic structure 8 at least has an elastic component force that limits the relative movement between the two. For example, with the attached Figure 1 Taking the blade 1 shown as an example, the blade 1 actually extends along the moving direction of the blade 1 when in use. After the blade 1 and the blade holder 2 are snap-connected, there is a snap margin in the direction perpendicular to the moving direction of the blade 1. Therefore, at this time, the elastic structure 8 is required to have an elastic force perpendicular to the moving direction so that the relative free movement between the blade 1 and the blade holder 2 is elastically restricted, reducing the relative movement between the blade 1 and the blade holder 2 under the action of non-external forces (the relative force of the other blade 1, the force of the hair) caused by loose fitting, avoiding the jumping of the blade 1, ensuring the stability of the shearing surface during shearing operations, ensuring the formation of an effective shearing surface between the moving blade and the static blade, and improving the shearing efficiency and user experience.

[0031] In addition, it should be emphasized that the razor blade described in the present invention does not limit the application scope of the blade, that is: it does not limit whether the blade 1 is a movable blade or a stationary blade; nor does it limit the specific form of the blade 1, such as a sheet structure (scraper), a U-shaped structure, a circular blade, etc.; it does not limit the movement state of the blade 1, for example, it can be mobile or rotating, etc. In the blade 1 shown in the drawings of this embodiment, taking the blade 1 as a movable blade as an example, the blade 1 is U-shaped, that is, the cross-section of the blade 1 in the perpendicular shear direction is U-shaped. Specifically, the connecting portion 12 of the blade 1 includes two connecting walls 13 arranged in parallel, and the connecting portion 12 is connected between the two connecting walls 13 in an arc shape. As shown in the attached figure Figure 1 、 2 As shown, the blade holder 2 has two side walls opposing connecting walls 13, which are supported on the outside of the two side walls. A connecting seat 9 is located in the center of the blade holder 2. This connecting seat 9 is typically connected to a power output terminal, and the movable blade can be driven by a power source to reciprocate and translate for hair trimming. The cutting portion 11 is connected between the two connecting walls 13, and the blade holder 2 and the connecting walls 13 are connected by a snap-fit connection.

[0032] It should be emphasized that: the elastic structure 8 has an elastic force in the perpendicular shear direction so that the blade 1 and the knife seat 2 form an elastic connection, wherein the source of the elastic force can be the elastic structure 8 formed by an elastic material, that is, the elastic force itself is because the elastic structure 8 adopts an elastic material, and the elastic material can be TPE, TPR, etc. The elastic structure 8 can be locally arranged between the blade 1 and the knife seat 2, or the elastic structure 8 can be arranged between the blade 1 and the knife seat; in addition, the source of the elastic force can also be that the elastic structure 8 itself accumulates a certain elastic force due to the structural design, thereby maintaining an elastic limiting connection between the blade 1 and the knife seat 2. For example, the elastic structure 8 is designed to have flexibility, elastic feet, arches, hemispheres, etc., which can accumulate elastic force so that the blade 1 and the knife seat 2 are close to each other.

[0033] The following is an example of the location of the elastic structure 8:

[0034] In a specific implementation, the elastic structure 8 can be provided at the position where the blade 1 is connected to the blade seat 2 by snapping: one of the blade 1 or the blade seat 2 is provided with a snap groove 4, and the other of the blade 1 or the blade seat 2 is provided with a snap portion 10 connected to the snap groove 4. The elastic structure 8 can be provided in the snap groove 4 or the snap portion 10. In the drawings shown in this embodiment, the snap groove 4 is formed on the blade 1, and the snap portion 10 is formed on the blade seat 2. The snap portion 10 is a protruding snap convex portion (such as a snap foot, a hook-shaped structure, or a spring) provided on the blade seat 2. When the elastic structure 8 is provided in the snap groove 4, preferably, the material of the groove side wall in contact with the snap portion 10 is selected from an elastic material to form the elastic structure 8. The specific form of the elastic structure 8 is not limited. For example, a relative protrusion can be provided on the surface that cooperates with the snap portion 10. When the elastic structure 8 is arranged on the snap portion 10, the portion of the snap portion 10 that contacts the snap groove 4 can be set to be elastic, for example, at least the contact portion is made of elastic material, or the snap portion 10 is directly set to be an elastic structure 8, for example, the snap portion 10 is a structure with flexibility and protrudes relative to the knife seat 2.

[0035] In a specific implementation, the elastic structure 8 can also be set at a position where the blade 1 and the knife seat 2 are not snap-fitted. For example, one of the blade 1 or the knife seat 2 is provided with a positioning groove 5, and the other of the blade 1 or the knife seat 2 is provided with an elastic structure 8 that cooperates with the positioning groove 5. The elastic structure 8 has an elastic portion 7 that can accumulate elastic force in the perpendicular shear direction. The elastic portion 7 can be made of an elastic material, or the elastic portion 7 can be set in a shape that can accumulate elastic force, such as having an arch, a warp, a spiral, etc. In this embodiment, specifically as follows: the positioning groove 5 is formed at the bottom of the connecting wall 13 of the blade, the elastic structure 8 is provided on the knife seat 2, and the blade 1 is elastically supported on the elastic structure 8 through the positioning groove 5. The elastic structure 8 is provided at positions on both sides of the knife seat 2 corresponding to the connecting wall 13, and four groups of elastic structures 8 are provided opposite each other. In a specific implementation, at least one elastic structure 8 is provided, and the number is not limited.

[0036] like Figure 3 As shown, the elastic structure 8 has a relatively protruding protrusion 15, and the positioning groove 5 is elastically limited in contact with the protrusion 15. The elastic structure 8 extends along the shearing direction, and the elastic structure 8 includes a connecting end and an elastic support end. The connecting end is connected to the knife seat 2, and the elastic support end is away from the connecting end. The protrusion 15 is located at the elastic support end. The protrusion 15 protrudes relative to the elastic support end in the perpendicular shearing direction and elastically presses against the top wall of the positioning groove 5 (the top and bottom are Figure 2 Directions shown).

[0037] Of course, the elastic structure 8 can also be provided at a position where the blade 1 and the blade holder 2 are not engaged by snap fit, and the material of the elastic structure 8 can be an elastic material. In this case, the elastic force of the elastic structure 8 can be generated by the compression of the material itself, or it can be generated by the structural design of the elastic structure 8 itself as described above. Of course, it can also be a combination of both, that is, the structural design of the elastic structure 8 itself is supplemented by at least a portion of elastic material to increase the elastic force, and at the same time, it can also increase the friction between the blade 1 and the blade holder 2, reducing the relative movement between the two.

[0038] Further, such as Figure 1 、 2 As shown, the positioning groove 5 comprises an opening 51, a support portion 52 opposite the opening 51 and elastically connected to the elastic structure 8, and two groove side surfaces 53 disposed opposite 51 and connected between the opening and the support portion 16. The groove side surfaces 53 are inclined, thereby reducing the diameter of the positioning groove 5 from the opening to the support portion 16. In practice, at least one groove side surface 53 can be inclined, thereby gradually reducing the diameter of the positioning groove 5 from the opening to the support portion 16. This arrangement allows the positioning groove 5 to form a tapered fit with the elastic structure 8, resulting in an interference fit that resists loosening. In practice, the blade holder 2 is typically made primarily of plastic injection molding. Considering the tendency of plastic injection molding to deform over time, this tapered structural design allows for deformation of the plastic injection molding. This prevents the shearing effect from being affected by local overtightening caused by the plastic part's enlargement or deformation. The blade 1 is thus smoother and more comfortable to use.

[0039] In this embodiment, the positioning groove 5 is provided at the bottom end of the blade 1 for illustration. In specific implementation, the location of the positioning groove 5 is not limited. For example, the positioning groove 5 can also be provided near the top end of the blade 1.

[0040] In order to reduce the relative movement between the blade 1 and the blade holder 2 along the moving direction of the blade 1, an intermediate positioning structure 17 is further provided between the blade holder 2 and the blade 1. The intermediate positioning structure 17 can limit the relative displacement of the blade 1 and the blade holder 2 along the shearing direction. Specifically, the intermediate positioning structure 17 includes a limiting groove 6 formed on the blade 1 or the blade holder 2, and a limiting block 14 formed on the blade holder 2 or the blade 1. Figure 1 、 2 As shown, in this embodiment, the limiting groove 6 is opened at the bottom of the blade 1, and the limiting block 14 is set on the knife seat 2. The limiting block 14 is inserted into the limiting groove 6, and the movement of the blade 1 and the knife seat 2 is limited by the connection between the two.

[0041] In order to improve the fit between the blade 1 and the knife seat 2 after assembly and prevent the blade 1 from being partially bent (concave and convex) and affecting the shearing effect, in a specific implementation, the connecting portion 12 of the blade 1 is formed into a planar fit with the knife seat 2 at least partially along the shearing direction. "Plane fit" means that the contact portion between the blade 1 and the knife seat 2 is in a planar contact state. After such a setting, the blade 1 will not bend or deform due to local stress concentration under the support and limitation of the knife seat 2; the "planar fit is formed at least partially along the shearing direction" means that the planar fit is formed to extend along the shearing direction, which can form a certain guide and limit in the moving direction of the blade 1, and can also ensure the fit between the blade 1 and the knife seat 2, effectively avoiding the blade 1 from jumping during cutting.

[0042] Furthermore, a support and limiting structure is provided between the blade 1 and the blade holder 2. The support and limiting structure can be formed on the blade 1 or the blade holder 2. The support and limiting structure has a plane that is in close contact with the blade 1 or the blade holder 2, or the portion of the support and limiting structure that is in close contact with the blade 1 or the blade holder 2 is in the same plane. The plane in close contact can be multiple and spaced apart along the direction of movement of the blade 1, or it can be just one. The material of the plane can be an elastic material. The support and limiting structure can also be a number of local raised structures, and the points where the raised structures are in contact with the blade 1 or the blade holder 2 are in the same plane. Since the thickness of the blade 1 is generally only 0.5 microns, this arrangement ensures the flatness of the blade 1 after installation, and improves the straightness of the blade 1. Especially in the case of this U-shaped blade, the flatness of the shearing surface is improved, noise is reduced, and the shearing effect and efficiency are improved. In this embodiment, the support and limiting structure is two parallel connecting walls 13, which form a planar contact with the blade holder 2.

[0043] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily 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 is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A razor blade, characterized in that: The blade and the knife seat are provided with a snap-fit mechanism, wherein the blade has a shearing portion and a connecting portion, the shearing portion forms cutting teeth, the connecting portion is connected to the knife seat, the blade and the knife seat are connected and fixed by means of a snap-fit mechanism, and at least part of the connecting portion of the blade and the knife seat has an elastic connection limit; the blade or the knife seat has an elastic structure, and the elastic structure has an elastic force in a perpendicular shearing direction so that the blade and the knife seat form an elastic connection; one of the connecting portion of the blade or the knife seat is provided with a snap-fit groove, and the other of the connecting portion of the blade or the knife seat is provided with a snap-fit portion connected to the snap-fit groove, the elastic structure is provided in the snap-fit groove or the snap-fit portion, one of the blade or the knife seat is provided with a positioning groove, and the other of the blade or the knife seat is provided with an elastic structure cooperating with the positioning groove, and the elastic structure has an elastic portion that can accumulate elastic force in the perpendicular shearing direction.

2. The razor blade according to claim 1, wherein: The connecting portion of the blade includes two connecting walls arranged in parallel, the shearing portion is connected between the two connecting walls, the blade seat and the connecting walls are snap-connected, the positioning groove is formed at the bottom of the connecting wall of the blade, the elastic structure is arranged on the blade seat, and the blade is elastically supported on the elastic structure through the positioning groove.

3. The razor blade according to claim 2, wherein: The elastic structure has a relatively protruding protrusion, and the positioning groove is in elastic limiting contact with the protrusion.

4. The razor blade according to claim 3, wherein: The elastic structure extends along the shearing direction, and the elastic structure includes a connecting end and an elastic supporting end. The connecting end is connected to the knife seat, and the elastic supporting end is far away from the connecting end. The protrusion is located at the elastic supporting end, and the protrusion protrudes relative to the elastic supporting end in the perpendicular shearing direction.

5. The razor blade according to claim 2, wherein: The cross section of the blade in the vertical shearing direction is U-shaped, and the connecting portion is connected between the two connecting walls in an arc shape.

6. The razor blade according to claim 1, wherein: The positioning groove has an opening, a support portion opposite to the opening and elastically connected to the elastic structure, and two groove side surfaces arranged oppositely and connected between the opening and the support portion, wherein at least one of the groove side surfaces is an inclined surface so that the diameter of the positioning groove gradually decreases from the opening to the support portion.

7. The razor blade according to claim 1, wherein: An intermediate positioning structure is further provided between the knife seat and the blade, and the intermediate positioning structure limits the relative displacement of the blade and the knife seat along the shearing direction.

8. The razor blade according to claim 1, wherein: The connecting portion of the blade and the blade seat form a planar fit at least partially along the shearing direction.

9. The razor blade according to claim 1, wherein: A support and limiting structure is provided between the blade and the blade seat. The support and limiting structure has a plane in close contact with the blade or the blade seat, or the part in close contact with the blade or the blade seat is in the same plane.

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