Hair trimming blade with safe teeth

Abstract

According to the hair trimming blade with the safe cutter teeth, the upper end portions, close to the tooth surfaces, of the cutter teeth protrude in the extending direction of the cutter teeth, so that a front cutting edge is located behind the intersecting line of the tooth end faces and the tooth surfaces to form a vertical safe distance L, and the accidental safety risk that the cutter teeth scratch the skin in the using process can be reduced through the structure. Due to the existence of the safe distance L, the front cutting edges of the cutter teeth cannot be in contact with the skin of a user even if certain pressure is applied to the trimming tool during hair trimming, so that a safe buffer space is provided between the front cutting edges of the cutter teeth and the skin, the risk that the cutter teeth scratch the skin in the hair trimming process is greatly reduced, and the service life of the cutter teeth is prolonged. And the use safety of the trimming blade is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of hair trimming devices, and in particular to a hair trimming blade with safety teeth. Background Art

[0002] Existing blades for trimming hair include a stationary blade and a moving blade. A number of guide hair grooves are respectively provided in the stationary blade and the moving blade, and stationary teeth or moving teeth are formed between adjacent guide hair grooves. When hair enters the guide hair grooves, the moving blade reciprocally swings along the stationary blade, so that the stationary teeth and the moving teeth cooperate with each other to cut the hair in the guide hair grooves.

[0003] During use, the stationary blade is in a relatively stationary state. The user manually pushes the trimming tool to slide along the skin so that the hair enters the guide hair grooves between the stationary teeth or the moving teeth. When the stationary teeth or the moving teeth contact the skin, the cutting edges at the ends of the stationary teeth or the moving teeth are extremely likely to scratch the skin, posing a certain potential safety hazard in use.

[0004] In response to this, in some existing trimming tools, the ends of the stationary teeth are subjected to blunt treatment to prevent the ends of the stationary teeth from scratching the skin when sliding along the skin. In order to prevent the moving teeth from scratching the skin during the reciprocating swing, an interval setting method is adopted, that is, the moving teeth and the stationary teeth are on different horizontal lines, increasing the distance between the moving teeth and the skin to avoid the moving teeth from scratching the skin. Although this assembly method can prevent the moving teeth from scratching the skin, there are also some technical defects. For example, after the distance between the moving teeth and the skin is increased, when the stationary teeth and the moving teeth trim hair perpendicular to the skin, the residual length of the hair roots is relatively long, and the use requirements of some application scenarios cannot be met. For example, during haircuts, fine trimming at the back of the head and the neck requires the use of a manual razor. Summary of the Invention

[0005] To solve the technical problems existing in the existing trimming blades, the present invention provides a hair trimming blade with safety teeth. This hair trimming blade can not only improve the safety of use and avoid scratching the skin, but also, on the premise of ensuring the safety of use, enable the teeth to directly contact the skin and, together with the cooperating blade, achieve the fine trimming effect of the hair.

[0006] To achieve the above object, the present invention provides the following technical solutions: A hair trimming blade with safety cutting teeth, comprising a blade body, on which a plurality of cutting teeth are arranged at intervals, and a hair guiding groove is formed between adjacent cutting teeth; each cutting tooth has a tooth surface, a cutting surface arranged relative to the tooth surface, two side tooth surfaces for connecting the tooth surface and the cutting surface, and a tooth end surface in the extending direction of the cutting tooth. A side cutting edge is formed at the intersection of the side tooth surface and the cutting surface, and a front cutting edge is formed at the intersection of the tooth end surface and the cutting surface; when projected from the side direction of the cutting tooth length, the upper part of the cutting tooth close to the tooth surface protrudes towards the extending direction of the cutting tooth, so that the front cutting edge is behind the intersection line of the tooth end surface and the tooth surface, and a vertical safety distance L is formed between the front cutting edge and the intersection line.

[0007] Preferably, the vertical safety distance L between the front cutting edge and the intersection line of the tooth end surface and the tooth surface is: 1mm > L > 0.1mm.

[0008] Preferably, when projected from the front projection of the tooth surface of the cutting tooth, each cutting tooth includes a tooth tip part and a tooth root part. The tooth tip part is wider at the front and narrower at the back, and the tooth root part is narrower at the front and wider at the back. Moreover, the narrower ends of the tooth tip part and the tooth root part are connected integrally, so that the hair guiding groove between adjacent cutting teeth forms a limiting groove that becomes wider from narrow at both ends and a cutting groove that becomes narrower from wide.

[0009] Preferably, rounded corners are respectively formed at the intersections of the tooth end surface and the two side tooth surfaces, so that obtuse arcs are respectively formed at the intersections of the tooth end surface and the two side tooth surfaces, and at the intersection of the tooth end surface and the cutting surface.

[0010] Preferably, when projected from the side direction of the cutting tooth, the tooth tip thickness H1 is less than the tooth root thickness H2, so that the cross-section of the tooth surface from the tooth root to the tooth tip is arc-shaped or wedge-shaped inclined towards the tooth tip.

[0011] Preferably, when projected from the front horizontal direction of the cutting tooth, an acute angle α side cutting edge is formed between the side tooth surfaces on both sides of the cutting tooth and the cutting surface, and the acute angle α of the side cutting edge remains the same from the tooth tip to the tooth root; Or, the acute angle α of the side cutting edge gradually increases from the tooth tip to the tooth root; Or, the acute angle α of the side cutting edge gradually decreases from the tooth tip to the tooth root; Among them, the acute angle α of the side cutting edge is: 0 < α < 90.

[0012] Preferably, when projected from the side direction of the cutting tooth length, the cutting tooth has a cutting layer and a tooth base layer. Among them, the side cutting edge and the front cutting edge are respectively formed on both sides and the front end of the cutting layer, the tooth base layer is superimposed above the cutting layer, and the width W1 of the cutting layer is greater than the width W2 of the tooth base layer.

[0013] Preferably, when viewed from the side projection of the cutter tooth length, the thickness H3 of the cutting layer near the tooth tip is less than the thickness H4 of the cutting layer near the tooth root, so that when viewed from the front horizontal projection of the cutter tooth, an acute-angle side cutting edge α is formed between the tooth side surfaces on both sides of the cutting layer and the cutting surface, and the acute angle α of the side cutting edge remains consistent from the tooth tip to the tooth root; or, it gradually increases from the tooth tip to the tooth root. Among them, the acute angle α of the side cutting edge is: 0 < α < 90.

[0014] Preferably, the tooth side surfaces on both sides of the tooth base layer and the cutting layer are composed of at least two sequentially connected planes or composed of at least one continuous arc surface.

[0015] Preferably, when viewed from the side projection of the cutter tooth length, a straight line connection is formed between the front cutting edge and the intersection line of the tooth end face and the tooth surface, so that the tooth end face of the cutter tooth is inclined in the extending direction of the cutter tooth. A safety distance L is formed between the vertical extension lines of the upper and lower edges of the inclined tooth end face. Moreover, an angle b1 is formed between the inclined tooth end face and the horizontal extension line of the cutting surface, where b1 > α.

[0016] Preferably, a special-shaped protrusion is formed on the inclined tooth end face of each cutter tooth. When viewed from the side projection of the cutter tooth length, the special-shaped protrusion has a first origin, a second origin, and a third origin. Among them, the first origin is formed on the intersection line of the tooth surface and the tooth end face, and an arc or parabola is connected between the first origin and the second origin; the third origin is formed on the front cutting edge, and an arc, parabola, or straight line is connected between the third origin and the second origin, so that a safety distance L is formed between the front cutting edge and the second origin. Moreover, taking the front cutting edge as the base point, an angle b2 is formed between the tangent line tangent to the connection line between the second origin and the third origin and the horizontal extension line of the cutting surface, where b2 > α.

[0017] The beneficial effect of the present invention is that the upper part of the cutter tooth near the tooth surface protrudes in the extending direction of the cutter tooth, so that a vertical safety distance L is formed behind the intersection line of the front cutting edge at the tooth end face and the tooth surface. Such a structure can reduce the accidental safety risk of the cutter tooth scratching the skin during use. Due to the existence of the safety distance L, when trimming hair, even if a certain pressure is applied to the trimming tool, the front cutting edge of the cutter tooth will not contact the user's skin, thereby providing a safe buffer space between the front cutting edge of the cutter tooth and the skin, greatly reducing the risk of the cutter tooth scratching the skin during hair trimming and improving the use safety of the trimming blade. Description of the Drawings

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required for the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0019] Attached Figure 1 is a schematic structural diagram of the present invention; Attached Figure 2 is attached Figure 1 is a schematic diagram from another angle; Attached Figure 3 is attached Figure 1 is a schematic diagram from another angle; Attached Figure 4 is attached Figure 1 is a sectional view taken along A'-A' in the attached; Attached Figure 5 is attached Figure 2 is an enlarged view of A in the attached; Attached Figure 6 is attached Figure 3 is an enlarged view of B in the attached; Attached Figure 7 is attached Figure 4 is an enlarged view of C in the attached; Attached Figure 8 is a schematic structural diagram of another embodiment of the present invention; Attached Figure 9 is attached Figure 8 is a schematic diagram from another angle; Attached Figure 10 is attached Figure 9 is a sectional view taken along D-D in the attached; Attached Figure 11 is attached Figure 9 is a sectional view taken along E-E in the attached; Attached Figure 12 is attached Figure 8 is a schematic diagram from another angle; Attached Figure 13 is attached Figure 12 is a partial enlarged view of the cutter teeth in the attached; Attached Figure 14 is attached Figure 13 is a sectional view taken along F-F in the attached; Attached Figure 15 is a schematic structural diagram of another embodiment of the present invention; Attached Figure 16 is attached Figure 15 is a schematic diagram from another angle; Attached Figure 17 is attached Figure 15 is a schematic diagram from another angle; Attached Figure 18 is attachedFigure 16 Cross-sectional view at G-G in the middle; Appendix Figure 19 For the appendix Figure 16 Cross-sectional view at I-I in the middle; Appendix Figure 20 For the appendix Figure 18 Enlarged view of the cross-section of one of the cutter teeth therein. Specific implementation manner

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0021] Next, the present invention will be further described in conjunction with the accompanying drawings of the specification.

[0022] The present invention provides the following technical solutions: As shown in the appendix Figures 1 - 20 As shown, the present invention discloses a hair trimming blade with safety cutter teeth, including a blade body 1, on which a plurality of cutter teeth 2 are arranged at intervals, and a hair guiding groove 3 is formed between adjacent cutter teeth 2; each cutter tooth 2 has a tooth surface 4, a cutting surface 5 arranged relative to the tooth surface 4, and two side tooth surfaces 6 for connecting the tooth surface 4 and the cutting surface 5 and a tooth end surface 7 in the extending direction of the cutter tooth 2. A side edge 8 is formed at the intersection of the side tooth surface 6 and the cutting surface 5, and a front edge 9 is formed at the intersection of the tooth end surface 7 and the cutting surface 5; viewed from the side direction projection of the length of the cutter tooth 2, the upper end portion of the cutter tooth 2 close to the tooth surface 4 protrudes in the extending direction of the cutter tooth 2, so that the front edge is behind the intersection line of the tooth end surface and the tooth surface, and a vertical safety distance L is formed between the front edge and the intersection line. Specifically, in this design, the upper end portion of the cutter tooth 2 close to the tooth surface 4 protrudes in the extending direction of the cutter tooth 2, so that the front edge 9 is behind the intersection line of the tooth end surface 7 and the tooth surface 4 to form a vertical safety distance L. Such a structure can reduce the accidental safety risk of the cutter tooth scratching the skin during use. Due to the existence of the safety distance L, when trimming hair, even if a certain pressure is applied to the trimming tool, the front edge 9 of the cutter tooth 2 will not contact the user's skin, thereby providing a safe buffer space between the front edge of the cutter tooth and the skin, greatly reducing the risk of the cutter tooth scratching the skin during hair trimming and improving the use safety of the trimming blade.

[0023] In actual production, the cutter tooth can be applied to the stationary blade or the moving blade of a trimming tool. For example, when the cutter tooth is applied to the stationary blade, a certain safety distance L is formed between the front cutting edge of the cutter tooth and the skin when the stationary blade slides along the skin, avoiding direct contact between the front cutting edge of the cutter tooth and the skin, preventing the cutter tooth from cutting the skin, and improving the safety of using the trimming blade.

[0024] When the cutter tooth is applied to the moving blade, not only can a safety distance L be formed between the cutter tooth 2 and the skin, improving the safety of use; at the same time, each cutter tooth 2 in the moving blade and each cutter tooth in the stationary blade can be on the same horizontal plane. When precision trimming is required (such as when precision trimming the back of the head and the neck), the cutter teeth in the stationary blade and the cutter teeth 2 in the moving blade can both directly contact the skin, minimizing the residual length of the hair roots to the greatest extent, and achieving the precision trimming effect of the hair without the need to use a manual scraper.

[0025] Furthermore, the vertical safety distance L between the front cutting edge 9 and the intersection line of the tooth end face 7 and the tooth surface 4 is: 1mm > L > 0.1mm. Specifically, in this embodiment, the vertical safety distance L is precisely controlled between 0.1mm and 1mm, achieving the best balance between safety and efficiency. An overly large safety distance (i.e., greater than 1mm) may cause a pulling phenomenon between the stationary blade and the moving blade, causing a pulling pain on the user's skin and discomfort to the user; while an overly small safety distance (i.e., less than 0.1mm) may not provide sufficient protection, increasing the risk of accidentally scratching the skin. Preferably, the safety distance L is: 0.5mm > L > 0.2mm.

[0026] Refer to the appendix Figure 1As shown, in one embodiment, from the orthographic projection of the tooth surface 4 of the blade tooth 2 (i.e., the top view of the blade tooth), each blade tooth 2 includes a tooth tip 10 and a tooth root 11, the tooth tip 10 is wide at the front and narrow at the back, and the tooth root 11 is narrow at the front and wide at the back, and the narrower ends of the tooth tip 10 and the tooth root 11 are connected to form a whole, so that the hair guide groove 3 between adjacent blade teeth 2 forms a limiting groove 12 with two ends that become wider from narrow and a cutting groove 13 that becomes narrower from wide. Specifically, in this embodiment, the front end width of the tooth tip 10 is greater than the rear end width thereof, and the front end width of the tooth root 11 is less than the rear end width thereof, but the front end width of the tooth tip 10 is greater than the front end width of the tooth root 11. This design makes the two ends of the hair guide groove 3 present different functional characteristics: the limiting groove 12 part (from narrow to wide) can make it difficult for the hair entering the hair guide groove 3 to slide out of the hair guide groove 3, and has a certain hindering effect on the hair, so as to buy time for the reciprocating swing cutting of the matching moving blade, so as to cut all the entered hair at one time, thereby improving the hair trimming efficiency. The cutting groove 13 part (from wide to narrow) can compress the sliding space of the hair after entering the hair guide groove 3, reduce the sliding of the hair, and improve the hair trimming performance. In addition, this connection method of the tooth tip 10 and the tooth root 11 can also significantly enhance the structural strength of the blade teeth 2, avoid the blade teeth from being broken due to stress, and improve the service life and hair trimming performance of the trimming blade.

[0027] Reference Figures 10 - 11 As shown, in one embodiment, rounded corners 14 are formed at the intersections of the tooth end face 7 and the two tooth side faces 6, so that the intersections of the tooth end face 7 and the two tooth side faces 6, and the intersections of the tooth end face 7 and the cutting surface 5 form arc obtuse angles 15. Specifically, in this embodiment, the intersections of the tooth end face 7 and the two tooth side faces 6, and the intersections of the tooth end face 7 and the cutting surface 5, are provided with rounded corners 14, which effectively avoids the risk of scratches caused by sharp corners. In addition, the setting of the rounded corners 14 also helps to reduce the resistance during the cutting process, making the blade smoother when sliding, and further improving the efficiency and comfort of trimming.

[0028] Furthermore, when projected from the side direction of the tooth 2, the thickness H1 of the tooth tip is smaller than the thickness H2 of the tooth root. With this design, the cross-section of the end of the tooth 2 is smaller, making it easier to insert into the hair clump, reducing the obstruction of the hair by the excessively large cross-section of the tooth 2, separating the hair more smoothly, and improving the hair feeding efficiency of the trimming blade; and the tooth root thickness H2 is larger, which provides sufficient support for the tooth 2, and the working strength of the tooth is higher, preventing the tooth 2 from being deformed or broken due to excessive force during the trimming process.

[0029] Reference Figures 11 - 13As shown, in one embodiment, the cross section of the tooth surface 4 from the tooth root to the tooth tip is arranged in an arc shape, such a design makes the trimming blade slide along the skin with less resistance and smoother sliding. Such a cross-sectional shape also helps to guide the hair into the hair guide groove 3 more smoothly, thereby improving the efficiency and comfort of trimming.

[0030] Reference Figures 2 - 5 As shown, in another embodiment, the cross section of the tooth surface 4 from the tooth root to the tooth tip is set in a wedge shape. The wedge shape setting makes the cross-sectional resistance of the blade teeth 2 smaller when inserting into the hair clump during hair cutting, and can separate the hair more quickly, thereby improving the hair feeding efficiency of the trimming blade. At the same time, this wedge shape design makes it easier to adjust the trimming angle of the trimming blade, and the hair trimming efficiency is higher.

[0031] Reference Figure 20 As shown, from the horizontal projection of the front of the blade tooth 2, the side edges 6 on both sides of the blade tooth 2 and the cutting surface 5 form a side cutting edge 8 with an acute angle α, and the acute angle α of the side cutting edge 8 is consistent from the tooth tip to the tooth root. Such a design enables the blade tooth 2 to cut hair more stably and efficiently. The existence of the acute angle α enables the side cutting edge 8 to cut into the hair more sharply, reducing the force and time required for cutting, thereby improving the speed and efficiency of trimming. At the same time, the side cutting edge 8 maintains a consistent acute angle α design from the tooth tip to the tooth root, which correspondingly reduces the difficulty of forming the blade tooth, especially when using a mold, the mold is easier to make.

[0032] In another embodiment, the acute angle α of the side cutting edge 8 gradually increases from the tooth tip to the tooth root. This design makes the working strength of the cutter tooth 2 gradually increase from the tooth tip to the tooth root, preventing the cutter tooth from being broken by force and increasing the service life of the cutter tooth. However, its molding difficulty is relatively more difficult than that of the cutter tooth with a uniform side cutting edge angle, and the auxiliary mold is more difficult to make.

[0033] In another embodiment, the acute angle α of the side cutting edge 8 gradually decreases from the tooth tip to the tooth root. Such a design reduces the sharpness of the end of the blade tooth 2, avoids the end of the blade tooth 2 being too sharp and piercing the skin, and improves the safety of the trimming blade. The acute angle of the side cutting edge 8 gradually increases from the tooth tip to the tooth root, which means that the side cutting edge 8 becomes sharper from the tooth tip to the tooth root, ensuring the cutting sharpness of the trimming blade.

[0034] Among them, the acute angle α of the side cutting edge 8 is: 0° < α < 90°, preferably, the acute angle α of the side cutting edge 8 is: 30° ≤ α ≤ 60°. Specifically, in this embodiment, the acute angle α of the side cutting edge 8 is controlled between 30° and 60°. This range can ensure that the cutting teeth 2 have sufficient sharpness when cutting hair, and can also maintain good stability and durability. If the acute angle α is too small (i.e., less than 30°), the cutting teeth 2 may be too sharp. Although the cutting efficiency is high, it will also cause the working intensity of the side cutting edge to become low, and the side cutting edge is extremely prone to chipping under force, resulting in damage to the trimming blade; while if the acute angle α is too large (i.e., greater than 60°), it may reduce the cutting efficiency and make the trimming process laborious.

[0035] In one embodiment, when viewed from the side direction projection of the length of the cutting tooth 2 (i.e., from the side of the tooth tip to the side of the tooth root), the cutting tooth 2 has a cutting layer 16 and a tooth base layer 17. Among them, the side cutting edge 8 and the front cutting edge 9 are respectively formed on both sides and the front end of the cutting layer 16, and the tooth base layer 17 is superimposed above the cutting layer 16, and the width W1 of the cutting layer 16 is greater than the width W2 of the tooth base layer 17. Specifically, in this embodiment, the wider width W1 of the cutting layer 16 can make the acute angle of the side cutting edge 8 smaller and the sharpness of the side cutting edge 8 higher, thereby correspondingly improving the hair trimming efficiency of the trimming blade. If the width of the cutting layer W1 is the same as that of the tooth base layer, due to the width limitation, the adjustment space of the acute angle of the side cutting edge is smaller, and the cutting sharpness of the side cutting edge 8 cannot be improved.

[0036] Furthermore, when viewed from the side direction projection of the length of the cutting tooth 2, the thickness H3 of the cutting layer 16 near the tooth tip is less than the thickness H4 of the cutting layer 16 near the tooth root, so that when viewed from the front horizontal direction projection of the cutting tooth 2, an acute angle α side cutting edge 8 is formed between the tooth side surfaces 6 on both sides of the cutting layer 16 and the cutting surface 5, and the acute angle α of the side cutting edge 8 remains the same from the tooth tip to the tooth root; or, it gradually increases from the tooth tip to the tooth root, where the acute angle α of the side cutting edge 8 is: 0° < α < 90°. Specifically, in this embodiment, the thinner design H3 of the cutting layer 16 near the tooth tip makes the cross-sectional resistance of the cutting tooth 2 smaller when inserting into the hair cluster during hair cutting, can separate the hair more quickly, and improves the hair feeding efficiency of the trimming blade.

[0037] Furthermore, the tooth side surfaces 6 on both sides of the tooth base layer 17 and the cutting layer 16 are composed of at least two sequentially connected planes or at least one continuous arc surface. In one embodiment, the tooth side surfaces 6 on both sides of the tooth base layer 17 and the cutting layer 16 are composed of at least two sequentially connected planes. The tooth base layer 17 and the cutting layer 16 can be formed by a single stamping process or a powder molding process. The single stamping process can ensure the structural strength of the tooth base layer 17 and the cutting layer 16, and at the same time improve production efficiency. In this forming method, the flat parts of the tooth side surfaces 6 can maintain good flatness and accuracy, which helps to improve the cutting performance and stability of the cutter teeth 2. The powder molding process can realize the complex structures of the tooth base layer 17 and the cutting layer 16, while ensuring high dimensional accuracy and surface quality. The powder molding process presses metal powder into shape and then performs subsequent treatments such as sintering, which can produce cutter tooth structures with complex shapes and high precision, meeting the special requirements of the present invention for the shape and performance of the cutter teeth. In addition, the powder molding process also has good material utilization rate and low production cost, which helps to improve the overall cost performance of the trimming blade.

[0038] In another embodiment, the tooth side surfaces 6 on both sides of the tooth base layer 17 and the cutting layer 16 are composed of at least one continuous arc surface, and the arc surface can be formed by using a special-shaped grinding wheel for tooth cutting operation. Such a design makes the tooth side surfaces 6 have better smoothness and fluidity, which helps to reduce friction and resistance during the cutting process, and improve the trimming efficiency and comfort. At the same time, the design of the continuous arc surface can also increase the structural strength of the cutter teeth 2, making the cutter teeth less likely to deform or break when stressed, and extending the service life of the trimming blade. In addition, using a special-shaped grinding wheel for tooth cutting operation can accurately control the shape and size of the tooth side surfaces 6, ensuring that each cutter tooth has good cutting performance and stability.

[0039] Refer to the attached Figure 7 As shown, when viewed from the side direction projection of the length of the cutter tooth 2, a straight line connection is formed between the front cutting edge 9 and the intersection line of the tooth end face 7 and the tooth surface 4, so that the tooth end face 7 of the cutter tooth 2 is inclined in the extending direction of the cutter tooth 2. A safety distance L is formed between the vertical extension lines of the upper and lower edges of the inclined tooth end face 7. And an included angle b1 is formed between the inclined tooth end face 7 and the horizontal extension line of the cutting surface 5, where b1 > α. Specifically, in this embodiment, the design of the inclined tooth end face 7 not only forms a certain safety distance L between the front cutting edge 9 and the skin or hair, but also further enhances the safety of use through the setting of the included angle b1 (b1 > α). The included angle b1 is formed between the inclined tooth end face 7 and the horizontal extension line of the cutting surface 5, making its angle small and facilitating the clamping of hair. Especially when trimming soft or difficult-to-catch hair, it can effectively improve the accuracy and efficiency of trimming.

[0040] Refer to the attachedFigure 13 As shown, a special-shaped protrusion 18 is formed on the inclined tooth end face 7 of each cutting tooth 2. When viewed from the side direction projection of the length of the cutting tooth 2, the special-shaped protrusion 18 has a first origin 19, a second origin 20, and a third origin 21. Among them, the first origin 19 is formed on the intersection line of the tooth surface 4 and the tooth end face 7, and an arc or a parabola is connected between the first origin 19 and the second origin 20; the third origin 21 is formed on the front cutting edge 9, and an arc, a parabola, or a straight line is connected between the third origin 21 and the second origin 20, so that a safety distance L is formed between the front cutting edge 9 and the second origin 20. And, with the front cutting edge 9 as the base point, an included angle b2 is formed between the tangent line tangent to the connection line between the second origin 20 and the third origin 21 and the horizontal extension line of the cutting surface 5, where b2 > α. Specifically, in this embodiment, the first origin 19 is located on the intersection line of the tooth surface 4 and the tooth end face 7 and serves as the starting point of the special-shaped protrusion 18, ensuring a smooth transition between the protrusion and the body of the cutting tooth 2 and avoiding the risk of scratching caused by sharp corners. An arc or a parabola is connected between the first origin 19 and the second origin 20. This design not only makes the special-shaped protrusion 18 visually more smooth but also enhances its comfort when contacting the skin during the cutting process. The third origin 21 is located on the front cutting edge 9 and is connected to the second origin 20 by an arc, a parabola, or a straight line. This connection method ensures a smooth transition between the front cutting edge 9 and the special-shaped protrusion 18. At the same time, with the front cutting edge 9 as the base point, the included angle b2 formed between the tangent line tangent to the connection line between the second origin 20 and the third origin 21 and the horizontal extension line of the cutting surface 5 further improves the cutting efficiency. The included angle b2 is greater than the acute angle α of the side cutting edge 8, so that there will be no phenomenon of hair pulling or hair clamping between the cutting teeth 2. In addition, the setting of the special-shaped protrusion 18 also forms an additional safety distance L between the front cutting edge 9 and the tooth end face 7. This design further reduces the risk of scratching caused by careless operation. Even when a certain pressure is applied during use, the front cutting edge 9 will not immediately contact the user, thus providing a safer buffer area.

[0041] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can 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 these embodiments shown herein but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A hair trimming blade with safety teeth, comprising a blade body, on which a plurality of teeth are arranged at intervals, and hair guide grooves are formed between adjacent teeth; characterized in that: Each tooth has a tooth surface, a cutting surface arranged relative to the tooth surface, and tooth side surfaces on both sides for connecting the tooth surface and the cutting surface, and a tooth end surface in the extension direction of the tooth. A side cutting edge is formed at the intersection of the tooth side surface and the cutting surface, and a front cutting edge is formed at the intersection of the tooth end surface and the cutting surface. From the side projection of the tooth length, the upper end part of the tooth close to the tooth surface protrudes toward the extension direction of the tooth, so that the front cutting edge is behind the intersection line of the tooth end surface and the tooth surface, and a vertical safety distance L is formed between the front cutting edge and the intersection line.

2. The hair trimming blade with safety teeth according to claim 1, characterized in that: The vertical safety distance L between the front cutting edge and the intersection line of the tooth end face and the tooth surface is: 1mm> L >0.1mm.

3. The hair trimming blade with safety teeth according to claim 1, characterized in that: From the positive projection of the tooth surface, each tooth includes a tooth tip and a tooth root. The tooth tip is wide at the front and narrow at the back, while the tooth root is narrow at the front and wide at the back. In addition, the narrower ends of the tooth tip and the tooth root are connected to form a whole, so that the hair guide groove between adjacent teeth forms a limiting groove that becomes wider at both ends and a cutting groove that becomes narrower at both ends.

4. The hair trimming blade with safety teeth according to claim 1, characterized in that: Chamfers are formed at the intersections of the tooth end face and the two tooth side faces, so that arc obtuse angles are formed at the intersections of the tooth end face and the two tooth side faces, and at the intersections of the tooth end face and the cutting face.

5. The hair trimming blade with safety teeth according to claim 1, characterized in that: When projected from the side of the tooth, the tooth tip thickness H1 is smaller than the tooth root thickness H2, so that the cross section of the tooth surface from the tooth root to the tooth tip is in an arc shape or a wedge shape inclined toward the tooth tip.

6. The hair trimming blade with safety teeth according to claim 1, characterized in that: When viewed from the horizontal projection of the front of the cutter tooth, a side cutting edge with an acute angle α is formed between the tooth side surfaces and the cutting surface on both sides of the cutter tooth, and the acute angle α of the side cutting edge remains consistent from the tooth tip to the tooth root; Alternatively, the acute angle α of the side cutting edge gradually increases from the tooth tip to the tooth root; Alternatively, the acute angle α of the side cutting edge gradually decreases from the tooth tip to the tooth root; Among them, the acute angle α of the side cutting edge is: 0< α <90.

7. The hair trimming blade with safety teeth according to claim 1, characterized in that: From the side projection of the tooth length, the tooth has a cutting layer and a tooth base layer, wherein the side cutting edge and the front cutting edge are respectively formed on both sides and the front end of the cutting layer, the tooth base layer is superimposed on the top of the cutting layer, and the cutting layer width W1 is greater than the tooth base layer width W2.

8. The hair trimming blade with safety teeth according to claim 7, characterized in that: From the side projection of the tooth length, the thickness H3 of the cutting layer near the tooth tip is smaller than the thickness H4 of the cutting layer near the tooth root, so that from the front horizontal projection of the tooth, a side cutting edge with an acute angle α is formed between the tooth side surfaces on both sides of the cutting layer and the cutting surface, and the acute angle α of the side cutting edge remains consistent from the tooth tip to the tooth root; or, it gradually increases from the tooth tip to the tooth root, wherein the acute angle α of the side cutting edge is: 0< α <90.

9. The hair trimming blade with safety teeth according to claim 7, characterized in that: The tooth side surfaces on both sides of the tooth base layer and the cutting layer are composed of at least two planes connected in sequence or at least one continuous arc surface.

10. The hair trimming blade with safety teeth according to any one of claims 1 to 9, characterized in that: From the side projection of the tooth length, the front cutting edge is connected to the intersection line of the tooth end face and the tooth surface by a straight line, so that the tooth end face of the tooth is inclined in the extension direction of the tooth, and a safety distance L is formed between the vertical extension line of the upper edge line and the lower edge line of the inclined tooth end face, and an angle b1 is formed between the inclined tooth end face and the horizontal extension line of the cutting surface, where b1> α.

11. The hair trimming blade with safety teeth according to claim 10, characterized in that: A special-shaped protrusion is formed on the inclined tooth end face of each tooth. When projected in the lateral direction of the tooth length, the special-shaped protrusion has a first origin, a second origin and a third origin, wherein the first origin is formed on the intersection line of the tooth surface and the tooth end face, and the first origin is connected to the second origin by an arc or a parabola; the third origin is formed on the front cutting edge, and the third origin is connected to the second origin by an arc, a parabola or a straight line, so that a safety distance L is formed between the front cutting edge and the second origin, and, with the front cutting edge as the base point, an angle b2 is formed between the tangent line tangent to the connecting line between the second origin and the third origin and the horizontal extension line of the cutting surface, wherein b2 > α.

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