Trimmer blade and cutter head assembly with spherical tooth tip and hair trimmer

Abstract

The present invention relates to a trimming blade and a blade head assembly with spherical tooth tips, and a hair trimmer. The blades are characterized by comprising a spherical segment, wherein the diameter R1 of the spherical segment is greater than the width H1 and height H2 of the tooth tips of the cutting teeth, and the bottom surface of the spherical segment is flush with the cutting working surface of the cutting teeth. The tooth tips of the cutting teeth are inserted into the spherical segment, forming protrusions on at least two sides of the tooth tips, excluding the cutting working surface, that are raised above the side surfaces. The spherical segment and the corresponding cutting teeth are integrally formed with the blade body. The present invention has the beneficial effect of providing the spherical segment at the tooth tips of the cutting teeth, wherein the spherical surface of the spherical segment can completely protrude above the remaining surfaces of the cutting teeth, excluding the cutting working surface, forming an arc-shaped protrusion on the side surfaces of the cutting teeth. During the hair trimming process, the protrusions extending beyond the side surfaces of the cutting teeth contact the skin before the surrounding side surfaces of the cutting teeth. The smooth arc-shaped spherical surface of the spherical segment effectively prevents the cutting teeth from puncturing or injuring the skin due to their excessive sharpness.

Description

Technical Field

[0001] The present invention relates to a blade for a hair trimmer, and more particularly to a hair trimmer blade with a spherical tooth tip, a cutter head assembly, and a hair trimmer, which are mainly used in the field of tools for hair trimming, such as hair clippers, razors, and hair shavers. Background Art

[0002] The blades used for hair trimming are mainly divided into static blades (also called fixed blades) and dynamic blades. When in use, the static blade is stationary and adheres to the skin surface. The cutting teeth set on the static blade and the static tooth grooves between adjacent cutting teeth are used to separate, introduce and capture hair. The dynamic blade is driven by the motor to swing back and forth along the end face of the static blade to cut hair.

[0003] Since the cutting teeth of existing hair trimming blades, whether they are movable blades or stationary blades, are basically cut by grinding wheels, the tips of the cutting teeth are relatively sharp, which can easily puncture or cut the skin during use, especially the stationary blade that comes into direct contact with the skin. Therefore, there are certain safety hazards. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a trimming blade and a cutter head assembly and a hair trimmer with spherical tooth tips, in which a spherical body is formed at the tooth tip of each cutting tooth, and the blade body, cutting teeth and spherical body are formed as one piece by using a metal one-piece molding process, so as to avoid the tooth tips of each cutting tooth puncturing or cutting the skin during use, thereby improving the safety of the trimming blade.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is a pruning blade with a spherical tooth tip, comprising a blade body, on which a plurality of cutting teeth are arranged at intervals, and cutting tooth grooves with openings are formed between adjacent cutting teeth; it also includes a spherical segment body, the diameter R1 of the spherical segment body is greater than the width H1 and height H2 of the tooth tip of the cutting tooth, and the bottom surface of the spherical segment body is flush with the cutting working surface of the cutting tooth; the tooth tip of the cutting tooth is inserted into the spherical segment body, so that protrusions are formed on at least two side surfaces around the tooth tip of the cutting tooth in addition to the cutting working surface; the spherical segment body and the corresponding cutting tooth are respectively integrally formed with the blade body, and at least one contact protruding from the spherical surface is provided on the spherical surface of the spherical segment body.

[0006] Preferably, a chamfered arc R2 integrally formed with the spherical segment body is provided at the edge of the bottom surface of the spherical segment body.

[0007] Preferably, the spherical segment height H3 is greater than half of the spherical segment diameter R1 and less than the spherical segment diameter R1.

[0008] Preferably, the number of the spherical segments is equal to the number of the cutting teeth, and the tip of each cutting tooth is inserted into the spherical segment and formed integrally with the spherical segment.

[0009] Preferably, the number of the spherical segments is less than the number of the cutting teeth, and the spherical segments are arranged at intervals at the tooth tips of the cutting teeth and are formed integrally with the cutting teeth.

[0010] Preferably, when viewed from the orthographic projection direction of either end of the blade body, there is one contact, which is arranged on the spherical surface of the spherical segment facing the skin and is an integral structure with the spherical segment.

[0011] Preferably, a plurality of contacts are evenly spaced along the spherical surface of the spherical segment and are integrally formed with the spherical segment.

[0012] Preferably, side teeth are respectively provided at both ends of the blade body, and a plurality of cutting teeth are spaced between the two side teeth, and the width of the side teeth is greater than the width of the cutting teeth; an arc-shaped protrusion is provided at the end of each side tooth, which is higher than the outer surface in contact with the skin, and one end of the arc-shaped protrusion is flush with the side surface of the side tooth facing outward, and the other end extends beyond the side surface of the side tooth close to the cutting tooth.

[0013] Preferably, the cross-section of the blade body is a right-angled triangle, and a plurality of downwardly recessed sub-guide grooves are provided on the inclined surface of the blade body. The width of each sub-guide groove is equal to the width of the cutting tooth groove and is connected to the bottom of the cutting tooth groove. The other end extends to the right-angled side of the blade body and passes through the outer surface of the blade body.

[0014] Preferably, a continuous wavy diversion groove is provided on the cutting working surface of the blade body above the root of each cutting tooth, and the groove wall of the diversion groove close to the cutting tooth side is an outwardly inclined inclined surface, the bottom surface of the groove is lower than the cutting working surface, and the trough of the diversion groove is respectively placed above the root of each cutting tooth, and the peak of the diversion groove is respectively placed above each cutting tooth groove.

[0015] Preferably, a teardrop-shaped oil storage tank is provided on the cutting working surface of each cutting tooth, and each oil storage tank is placed in the center of the cutting working surface of each cutting tooth.

[0016] Preferably, an oiling groove is provided on the cutting working surface of the blade body, the bottom plane of the oiling groove is lower than the bottom surface of the diversion groove provided on the cutting working surface of the blade body, and is connected to the diversion groove through an inclined groove edge.

[0017] Preferably, a fastening portion is provided on the side of the blade body opposite to the cutting teeth, the width of the fastening portion is smaller than the width of the blade body and its bottom end surface is flush with the cutting working surface on the blade body; a plurality of fastening screw holes and lubrication grooves are provided on the fastening portion.

[0018] Based on the technical solution of adding a contact to the above-mentioned spherical segment, the applicant also proposed a trimming blade with a spherical tooth tip, which is different from the spherical segment with a contact added to the spherical segment, comprising a blade body, on which a plurality of cutting teeth are arranged at intervals, and cutting tooth grooves with openings are formed between adjacent cutting teeth; it also includes a spherical segment, the diameter R1 of the spherical segment is greater than the width H1 and height H2 of the tooth tip of the cutting tooth, and the bottom surface of the spherical segment is flush with the cutting working surface of the cutting tooth; the tooth tip of the cutting tooth is inserted into the spherical segment, so that protrusions higher than the side surfaces are formed on at least two side surfaces around the tooth tip of the cutting tooth in addition to the cutting working surface; the spherical segment and the corresponding cutting teeth are respectively integrally formed with the blade body, and at least one groove lower than the spherical surface is provided on the spherical surface of the spherical segment.

[0019] Preferably, a chamfered arc R2 integrally formed with the spherical segment body is provided at the edge of the bottom surface of the spherical segment body.

[0020] Preferably, the spherical segment height H3 is greater than half of the spherical segment diameter R1 and less than the spherical segment diameter R1.

[0021] Preferably, the number of the spherical segments is equal to the number of the cutting teeth, and the tip of each cutting tooth is inserted into the spherical segment and formed integrally with the spherical segment.

[0022] Preferably, the number of the spherical segments is less than the number of the cutting teeth, and the spherical segments are arranged at intervals at the tooth tips of the cutting teeth and are formed integrally with the cutting teeth.

[0023] Preferably, side teeth are respectively provided at both ends of the blade body, and a plurality of cutting teeth are spaced between the two side teeth, and the width of the side teeth is greater than the width of the cutting teeth; an arc-shaped protrusion is provided at the end of each side tooth, which is higher than the outer surface in contact with the skin, and one end of the arc-shaped protrusion is flush with the side surface of the side tooth facing outward, and the other end extends beyond the side surface of the side tooth close to the cutting tooth.

[0024] Preferably, the cross-section of the blade body is a right-angled triangle, and a plurality of downwardly recessed sub-guide grooves are provided on the inclined surface of the blade body. The width of each sub-guide groove is equal to the width of the cutting tooth groove and is connected to the bottom of the cutting tooth groove. The other end extends to the right-angled side of the blade body and passes through the outer surface of the blade body.

[0025] Preferably, a continuous wavy diversion groove is provided on the cutting working surface of the blade body above the root of each cutting tooth, and the groove wall of the diversion groove close to the cutting tooth side is an outwardly inclined inclined surface, the bottom surface of the groove is lower than the cutting working surface, and the trough of the diversion groove is respectively placed above the root of each cutting tooth, and the peak of the diversion groove is respectively placed above each cutting tooth groove.

[0026] Preferably, a teardrop-shaped oil storage tank is provided on the cutting working surface of each cutting tooth, and each oil storage tank is placed in the center of the cutting working surface of each cutting tooth.

[0027] Preferably, an oiling groove is provided on the cutting working surface of the blade body, the bottom plane of the oiling groove is lower than the bottom surface of the diversion groove provided on the cutting working surface of the blade body, and is connected to the diversion groove through an inclined groove edge.

[0028] Preferably, a fastening portion is provided on the side of the blade body opposite to the cutting teeth, the width of the fastening portion is smaller than the width of the blade body and its bottom end surface is flush with the cutting working surface on the blade body; a plurality of fastening screw holes and lubrication grooves are provided on the fastening portion.

[0029] A cutter head assembly comprises any one of the above-mentioned trimming blades with spherical tooth tips.

[0030] A hair trimmer comprises the above-mentioned cutter head assembly, wherein the cutter head assembly comprises any one of the above-mentioned trimming blades with spherical tooth tips.

[0031] The present invention provides a beneficial effect by providing a spherical segment at the tip of the cutting tooth. The spherical segment's spherical surface can completely protrude from the remaining surfaces of the cutting tooth, excluding the cutting surface, and forms an arc-shaped protrusion on the corresponding side of the cutting tooth. When the cutting tooth is inserted into a clump of hair, the protrusion extending beyond the side of the cutting tooth contacts the skin before the surrounding side surfaces of the cutting tooth. The smooth arc-shaped surface of the spherical segment effectively prevents the cutting tooth tip from puncturing or cutting the skin due to its excessive sharpness. Adding the spherical segment to the tip of the cutting tooth provides better skin protection and greater safety compared to simply chamfering and blunting the tip of the cutting tooth. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 A top perspective view of a trimmer blade with a spherical tooth tip according to an embodiment of the present invention

[0033] Figure 2 A bottom perspective view of a trimmer blade with a spherical tooth tip according to an embodiment of the present invention

[0034] Figure 3 A cross-sectional view of a trimming blade with a spherical tooth tip according to an embodiment of the present invention

[0035] Figure 4 A partial enlarged cross-sectional view of the cutting teeth of an existing pruning blade

[0036] Figure 5 Schematic diagram of an embodiment of the present invention in which the height of the spherical segment is less than or equal to half the diameter of the spherical segment

[0037] Figure 6 Schematic diagram of the embodiment of the present invention in which the height of the spherical segment accounts for three-fifths of the diameter of the spherical segment

[0038] Figure 7Schematic diagram of the embodiment of the present invention in which the height of the spherical segment accounts for two-thirds of the diameter of the spherical segment

[0039] Figure 8 Schematic diagram of the embodiment of the present invention in which the height of the spherical segment accounts for three-quarters of the diameter of the spherical segment

[0040] Figure 9 This is the first embodiment of the present invention in which contacts are arranged on the spherical surface of the spherical segment.

[0041] Figure 10 This is the second embodiment of the present invention in which contacts are arranged on the spherical surface of the spherical segment.

[0042] Figure 11 This is the third embodiment of the present invention in which a contact is provided on the spherical surface of the spherical segment.

[0043] Figure 12 This is the first embodiment of the present invention in which grooves are provided on the spherical surface of the spherical segment.

[0044] Figure 13 This is the second embodiment of the present invention in which grooves are provided on the spherical surface of the spherical segment.

[0045] Figure 14 A front view of a trimming blade with a spherical tooth tip according to an embodiment of the present invention

[0046] Figure 15 Rear view of a trimmer blade with a spherical tooth tip according to an embodiment of the present invention

[0047] Figure 16 A second embodiment of providing a spherical segment for a trimming blade having a spherical tooth tip according to an embodiment of the present invention DETAILED DESCRIPTION

[0048] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0049] Trimming blades are essential components of hair trimming tools such as hair clippers, razors, and shavers. Trimming blades are divided into a static blade and a dynamic blade. Driven by a drive mechanism, the dynamic blade swings back and forth along the static blade to trim hair. While the trimming blade described in this technical solution is a static blade in actual use, the structure and features described in this technical solution do not necessarily apply only to static blades. They can also be directly applied to dynamic blades, regardless of actual needs, in tools such as hair clippers, razors, and shavers.

[0050] like Figure 1-16As shown, in order to solve the technical problem that the cutting teeth 2 of the existing trimming blade are formed by grinding wheel cutting, resulting in the tooth tips of the cutting teeth 2 being relatively sharp and puncturing or cutting the skin, the present invention is a trimming blade with spherical tooth tips, including a blade body 1, on which a plurality of cutting teeth 2 are arranged at intervals, and cutting grooves 3 with openings are formed between adjacent cutting teeth 2, and the cutting grooves 3 are used for separating and guiding hair.

[0051] To improve the safety of the pruning blade, the pruning blade also includes a spherical segment 4. The diameter R1 of the spherical segment 4 is greater than the width H1 and height H2 of the tooth tip of the cutting tooth 2, and the bottom surface 41 of the spherical segment is flush with the cutting working surface 21 of the cutting tooth 2. The tooth tip of the cutting tooth 2 is inserted into the spherical segment 4, so that a protrusion is formed on at least two side surfaces around the tooth tip of the cutting tooth 2, in addition to the cutting working surface 21. Compared with directly chamfering and passivating the tooth tip of the cutting tooth 2, adding the spherical segment 4 to the tooth tip of the cutting tooth 2 provides better skin protection and greater safety. Conventional pruning blades are generally made of metal. The cutting teeth 2 on the blade body 1 are mostly formed by cutting with a grinding wheel. The edges of the cutting teeth 2 are then passivated by a tumbling process. During the tumbling and passivation process, the cutting edges on both sides of the cutting teeth 2 are also passivated, which correspondingly reduces the cutting sharpness of the cutting teeth 2. At this point, it is necessary to use a grinding device to grind the cutting surface 21 of the cutting tooth 2 to increase the sharpness of the blade on one or both sides of the cutting tooth 2. While this can improve the hair trimming efficiency of the cutting tooth 2, it also forms a sharp angle at the vertex where the tip of the cutting tooth 2 intersects the cutting surface 21, which can easily puncture or injure the skin. Therefore, a spherical segment 4 is added to the tip of the cutting tooth 2. After ensuring that the cutting surface 21 and the bottom surface 41 of the spherical segment 4 are aligned and level, the spherical segment 4 is centered along the tip of the cutting tooth 2. Because the diameter R1 of the spherical segment 4 is greater than the tip width H1 and tip height H2 of the cutting tooth 2, when the tip of the cutting tooth 2 is inserted into the spherical segment 4, the spherical surface of the spherical segment 4 can completely protrude from the remaining surfaces of the cutting tooth 2 except the cutting surface 21, forming an arc-shaped convexity on the corresponding side of the cutting tooth 2. When trimming hair, the bottom surface 41 of the spherical segment 4 is flush with the cutting surface 21, ensuring the sharpness of the cutting teeth 2. When the cutting teeth 2 are inserted into a clump of hair, the protrusions extending beyond the sides of the cutting teeth 2 contact the skin before the surrounding sides of the cutting teeth 2. This, thanks to the smooth curved surface of the spherical segment 4, effectively prevents the sharp tips of the cutting teeth 2 from puncturing or cutting the skin, thereby improving the safety of the trimming blade.

[0052] Secondly, during the hair trimming process, the cutting teeth 2 of the trimming blade may only have two sides that may directly contact the skin. Figure 4As shown, the first is the outer surface 22 of the cutting tooth 2, which is positioned opposite the cutting surface 21 of the cutting tooth 2 and faces the skin, directly contacting the skin. The second is the tooth tip 23 of the cutting tooth 2, which may directly contact the skin when the trimming blade is inserted into the hair clump. The tooth tip 23 is located directly in front of the cutting tooth 2 and serves to connect the cutting surface 21 and the outer surface 22 of the cutting tooth 2. Therefore, when the tooth tip of the cutting tooth 2 is inserted into the spherical segment 4, as long as the outer surface 22 and the tooth tip 23 of the cutting tooth 2 (i.e., at least two side surfaces of the cutting tooth 2 excluding the cutting surface 21) form a protrusion higher than the corresponding surface (i.e., the spherical surface of the spherical segment 4), the cutting tooth 2 can be isolated from the skin, providing skin protection. The smooth curved spherical surface of the spherical segment 4 effectively prevents the cutting tooth 2 from puncturing or injuring the skin, thereby improving the safety of the trimming blade.

[0053] Since the side surfaces of the cutting teeth 2 on either side of the cutting surface 21 do not directly contact the skin during the hair trimming process, whether the curved spherical surface of the spherical segment 4 protrudes above the side surfaces of the cutting teeth 2 can be determined based on customer requirements. However, to improve hair trimming efficiency, in this embodiment, the spherical segment 4 preferably completely protrudes above the remaining surfaces of the cutting teeth 2 except for the cutting surface 21. This creates an arc-shaped protrusion at the tip of the cutting tooth 2 that extends beyond the left and right sides of the cutting tooth 2, thereby reducing the width of the opening of the incision groove 3 between adjacent cutting teeth 2. Once a hair enters the incision groove 3, the arc-shaped protrusion of the spherical segment 4 protruding above the left and right sides of the cutting tooth 2 acts as a barrier, delaying the hair from sliding out of the opening of the incision groove 3. This gives the trimming blade more time to cooperate with the hair cutting, thereby improving the hair trimming efficiency of the trimming blade.

[0054] According to conventional manufacturing processes, the spherical segment 4 can only be constructed as a separate body, which is then welded or bonded together to form a single piece with the cutting teeth 2. To ensure effective hair trimming, the thickness of existing spherical segment 4 and cutting teeth 2 is generally no more than 0.5 cm. If the spherical segment 4 and cutting teeth 2 are welded together, not only is welding difficult due to their small size, but the cutting teeth 2 are also prone to deformation. If the spherical segment 4 and cutting teeth 2 are constructed as a single piece, the cutting teeth 2 cannot be formed due to the limitation that the diameter R1 of the spherical segment 4 is greater than the width H1 and height H2 of the cutting teeth 2. To address these technical limitations, the spherical segment 4 and corresponding cutting teeth 2 in this embodiment are each integrally formed with the blade body 1, using metal powder injection molding technology to form the spherical segment 4, cutting teeth 2, and blade body 1 into a single piece. Compared to conventional grinding wheel cutting processes for forming cutting teeth 2, this method significantly facilitates the integrated formation of the spherical segment 4 and cutting teeth 2, facilitating production and processing, and ensuring a secure connection between the spherical segment 4 and cutting teeth 2. While other processes, such as die-casting, could also be used to achieve the integrated formation of the spherical segment 4, corresponding cutting teeth 2, and blade body 1, metal powder injection molding, however, is preferred for this embodiment due to its low production costs and ease of mass production.

[0055] It is particularly noted that the provision of a spherical segment 4 at the tip of the cutting tooth 2 is not limited to the shape of the spherical segment 4. It is just a special term selected for the convenience of describing the shape. It is sufficient to ensure that, in addition to the cutting working surface 21, the cutting tooth 2 has an end face at the tip of the cutting tooth 2 and at least two surfaces of the outer surface of the cutting tooth 2 away from the cutting working surface 21 that have a protrusion-like structure that is higher than the side surface, such as a spherical band or irregular protrusion shape.

[0056] To maximize the protective effect of the spherical segment 4 and prevent the tip of the cutting tooth 2 from puncturing or cutting the skin, the diameter R1 of the spherical segment 4 must be proportional to the height H2 of the cutting tooth 2 (which can also be considered the thickness of the cutting tooth 2). The diameter R1 of the spherical segment 4 is proportional to the height H2 of the cutting tooth 2 and will change with changes in the height H2 of the cutting tooth 2. As the height H2 of the cutting tooth 2 increases, the diameter R1 of the spherical segment 4 also increases. As the height H2 decreases, the diameter R1 of the spherical segment 4 also decreases. It is sufficient to ensure that when the spherical segment 4 is positioned at the tip of the cutting tooth 2, it is elevated above the remaining sides of the cutting tooth 2, excluding the cutting surface 21.

[0057] When the bottom surface 41 of the spherical segment body and the cutting working surface 21 of the cutting tooth 2 are processed at the same horizontal plane by the grinding equipment, an acute angle is formed between the spherical surface of the spherical segment body 4 and the bottom surface 41 of the spherical segment body with the bottom surface 41 of the spherical segment body as a reference. There is a possibility of puncturing or cutting the skin when trimming hair. In order to maximize the safety of the trimming blade, a chamfered arc R2 is provided at the edge of the bottom surface 41 of the spherical segment body, which is integrally formed with the spherical segment body 4. The arc chamfer R2 can shrink the edge of the bottom surface 41 of the spherical segment body toward the center of the spherical segment body 4, thereby increasing the distance D between the edge of the bottom surface 41 of the spherical segment body and the vertical tangent of the spherical surface of the spherical segment body 4. When the spherical surface of the spherical segment body 4 contacts the skin, the edge of the bottom surface 41 of the spherical segment body, which is relatively farther away from the skin surface, will not cause damage to the skin, thereby improving the safety of the trimming blade. In actual production, the arc chamfer R2 can be performed after the bottom surface 41 of the spherical segment body and the cutting working surface 21 are ground together, or it can be integrally formed with the spherical segment body 4 before grinding. However, since adding the arc chamfer R2 before the spherical segment body 4 is formed, it can effectively reduce the processing cost of manual chamfering. Therefore, the arc chamfer R2 is integrally formed with the spherical segment body 4 as a preferred embodiment.

[0058] Adding a circular chamfer R2 to the edge of the spherical segment bottom surface 41 causes the edge of the spherical segment bottom surface 41 to contract inward, increasing the distance D between the edge of the spherical segment bottom surface 41 and the perpendicular tangent line to the spherical segment 4, thereby preventing skin damage caused by the edge of the spherical segment bottom surface 41. Therefore, based on the addition of the circular chamfer R2 to the edge of the spherical segment bottom surface 41, the height H3 of the spherical segment only needs to be greater than the height H2 of the tooth tip of the cutting tooth 2. There is no specific limit and it can be customized according to customer requirements. Whether it is less than or greater than the radius of the spherical segment 4, it can still provide a protective effect.

[0059] Of course, the arc chamfer R2 may not be provided on the edge of the bottom surface 41 of the spherical segment, but the height H3 of the spherical segment must be limited, and the height H3 of the spherical segment must not be less than half of the diameter R1 of the spherical segment. If the height H3 of the spherical segment is less than or equal to half of the diameter R1 of the spherical segment 4, Figure 5 As shown, in a plane, the lower semicircle of the spherical segment 4 gradually extends upward and outward, causing the edge of the bottom surface 41 of the spherical segment 4 to directly overlap with the widest part of the spherical segment 4. When trimming hair, the edge of the bottom surface 41 of the spherical segment 4 will directly contact the skin, which can easily cause the skin to be punctured or cut by the edge of the spherical segment 4. Therefore, if the arc chamfer R2 is not provided, the height H3 of the spherical segment 4 must be greater than half the diameter R1 of the spherical segment 4. Figure 6-8As shown, in a plane, the upper half of the circle gradually converges upward and toward the center along both ends of the horizontal axis. When the spherical segment height H3 is greater than half of the spherical segment diameter R1, the edge of the spherical segment bottom surface 41 will inevitably be located inside the vertical tangent of the spherical segment 4, forming a certain distance D between the edge of the spherical segment bottom surface 41 and the skin surface. When trimming hair, the spherical segment 4 contacts the skin, while the edge of the spherical segment bottom surface 41 maintains a certain distance from the skin surface, preventing direct contact with the skin, thereby improving the safety of the trimming blade. If the distance D between the edge of the spherical segment bottom surface 41 and the skin surface needs to be increased, the ratio of the spherical segment height H3 to the spherical segment diameter R1 can be increased. Figure 6-8 It can be seen that the larger the ratio of the height H3 of the spherical segment to the diameter R1 of the spherical segment, the wider the distance D between the edge of the bottom surface 41 of the spherical segment and the vertical tangent of the spherical surface of the spherical segment 4. Figure 6 The height H3 of the spherical segment is three-fifths of the diameter R1 of the spherical segment. Figure 7 The height H3 of the spherical segment is two-thirds of the diameter R1 of the spherical segment. Figure 8 The spherical segment height H3 accounts for three-quarters of the spherical segment diameter R1. Therefore, to minimize contact between the edge of the spherical segment bottom surface 41 and the skin, the spherical segment height H3 preferably accounts for three-quarters of the spherical segment diameter R1. Furthermore, it should be noted that the arc chamfer R2 and the spherical segment height H3 are not mutually exclusive options; they can be provided simultaneously. For example, when the spherical segment height H3 accounts for three-quarters of the spherical segment diameter R1, the arc chamfer R2 is also provided on the edge of the spherical segment bottom surface 41. Alternatively, they can be provided separately. For example, when the spherical segment height H3 accounts for three-quarters of the spherical segment diameter R1, the arc chamfer R2 is not provided on the edge of the spherical segment bottom surface 41. The specific setting can be determined based on market demand or customer requirements.

[0060] As can be seen from the above embodiment, adding a spherical segment 4 to the tooth tip of the cutting tooth 2 provides more reliable skin protection. Therefore, to improve the safety of the pruning blade, the number of spherical segments 4 is equal to the number of cutting teeth 2, and the tooth tip of each cutting tooth 2 is respectively inserted into the spherical segment 4 and formed integrally with the spherical segment 4. Of course, according to customer requirements, the number of spherical segments 4 can be set to be less than the number of cutting teeth 2, and the spherical segments 4 can be arranged at intervals at the tooth tip of the cutting tooth 2 and formed integrally with the cutting tooth 2. Since the spherical segments 4 are arranged at the tooth tip of the cutting tooth 2, and the width of the cutting tooth groove 3 of adjacent cutting teeth 2 is relatively small, the spherical segments 4 can also be arranged at intervals at the tooth tip of each cutting tooth 2 to achieve the effect of protecting the skin. However, arranging the spherical segment 4 at the tooth tip of each cutting tooth 2 can greatly enhance the overall aesthetics of the pruning blade and is a preferred embodiment.

[0061] Because the diameter R1 of the spherical segment 4 is greater than both the width H1 and height H2 of the cutting teeth, the contact area is relatively large when the trimmer contacts the skin. While this provides better skin protection, it also reduces the feel of the trimming blade against the skin. To enhance the feel of the trimming blade against the skin, at least one contact 42 protruding from the spherical surface of the spherical segment 4 is provided. This contact 42 is integrally formed with the spherical segment 4, the cutting teeth 2, and the blade body 1. By contacting the skin with at least one contact 42 disposed on the spherical segment 4, each contact 42 acts as a comb, stimulating the head's nerves and accelerating blood circulation and oxygen supply to the skin, thereby creating a more comfortable feel and enhancing the user experience of the trimming blade.

[0062] However, from the perspective of the technical purpose to be achieved and the expected technical effect, the contact 42 is provided with one, and when viewed from the positive projection direction of either end of the blade body 1, the contact 42 is arranged on the spherical surface of the spherical segment 4 and is integrally structured with the spherical segment 4 and faces the skin, such as Figure 9 Or as shown in 10, the specific can be determined according to user requirements, and this embodiment does not impose further restrictions. Of course, in order to maximize the skin feel when the trimming blade contacts the skin, the contacts 42 can also be provided with a plurality of evenly spaced distributions along the spherical surface of the spherical segment 4 and integrally formed with the spherical segment 4. Figure 11 As shown, a plurality of contacts 42 are arranged at even intervals on the spherical surface of the spherical segment 4. When trimming hair, no matter from which direction the trimming blade contacts the skin, the contacts 42 on the spherical surface of the spherical segment 4 can directly contact the skin, thereby protecting the skin and improving the skin feel.

[0063] Compared with the above-mentioned arrangement of the contact 42 on the spherical surface of the spherical segment 4, Figure 12-13 As shown, a groove 43 or a plurality of grooves 43 evenly spaced across the entire spherical surface may be provided on the spherical surface of the spherical segment 4. When trimming hair, the groove 43 may be filled with a substance such as vaseline that has a moisturizing or hydrating effect or a hair-protecting effect, so as to expand the use scenarios of the trimming blade, for example, it is particularly suitable for medical emergency scenarios such as head injuries.

[0064] Since the cutting teeth 2 are spaced apart on one side of the blade body 1, to prevent deformation during the hair trimming process, side teeth 11 are provided at each end of the blade body 1. The cutting teeth 2 are spaced apart between the side teeth 11, and the side teeth 11 are wider than the cutting teeth 2. The wider side teeth 11 on either side of the blade body 1 enhance the bending strength of the cutting teeth 2, preventing deformation during use and ensuring hair trimming effectiveness. To prevent scratches or cuts from the side teeth 11, each side tooth 11 is provided with a curved protrusion 12 that extends above the outer surface in contact with the skin. One end of the curved protrusion 12 is flush with the outward-facing side of the side tooth 11, and the other end extends beyond the side of the side tooth 11 near the cutting tooth 2. An arc-shaped protrusion 12 protruding from the upper surface of the side tooth 11 is respectively provided at the end of the two side teeth 11, and one end of the arc-shaped protrusion 12 extends beyond its side surface. In this way, the arc-shaped protrusion 12 can also play the role of the spherical segment 4. However, since the side teeth 11 are relatively wide, the arc-shaped protrusion 12 forms a semi-cylindrical shape at the end of the side teeth 11 and cannot form a spherical segment shape. However, its function and purpose are the same as the spherical segment 4 at the tip of the cutting tooth 2, and will not be repeated here.

[0065] To facilitate the removal and separation of hair into the cutting grooves 3, the blade body 1 has a right-angled triangular cross-section. Multiple downwardly recessed sub-channels 13 are provided on the inclined surface of the blade body 1. Each sub-channel 13 is equal in width to the cutting groove 3 and connected to the bottom of the groove 3. Its other end extends to the right-angled side of the blade body 1, penetrating the outer surface of the blade body 1. The triangular shape of the blade body 1 allows the tips of the cutting teeth 2 to form sharp teeth, making it easier for the cutting teeth 2 to penetrate the hair clump during trimming. The sub-channels 13 provided on the inclined surface of the blade body 1 not only separate the hair but also facilitate the removal of cut hair.

[0066] Before leaving the factory, the trimming blade is integrated with the movable knife. To reduce friction between the trimming blade and the movable knife and lower the temperature rise of the trimming blade and the movable knife, a continuous wave-shaped diverter groove 14 is provided on the cutting surface 21 of the blade body 1, above the root of each cutting tooth 2. The groove wall 141 of the diverter groove 14 on the side of the cutting tooth 2 is an outwardly inclined surface, and its bottom surface is lower than the cutting surface 21. The trough 142 of the diverter groove 14 is located above the root of each cutting tooth 2, and the peak 143 of the diverter groove 14 is located above the root of each cutting tooth 2. By adding the diverter groove 14 to the cutting surface 21 of the blade body 1, solid lubricant can be added to the diverter groove 14 before the trimming blade is assembled. After being integrated with the movable knife, the movable knife can restrict the solid lubricant in the diverter groove 14, preventing the solid lubricant from slipping out of the trimming blade. When in use, the movable knife swings back and forth along the trimming blade to melt the solid lubricant into liquid, and the liquid lubricant flows along the inclined groove wall 141 at the trough 142 of the diversion groove 14 to the cutting working surface 21 to reduce the friction resistance between the movable knife and the trimming blade, reduce the temperature rise of the trimming blade and the movable knife, and improve the comfort of using the trimming blade.

[0067] Before leaving the factory, the trimming blade is integrated with the movable knife. To reduce friction between the trimming blade and the movable knife and lower the temperature rise of the trimming blade and the movable knife, a teardrop-shaped oil reservoir 15 is provided on the cutting surface 21 of each cutting tooth 2. Each oil reservoir 15 is located directly in the center of the cutting surface 21 of each cutting tooth 2. The teardrop-shaped oil reservoir 15 is the optimal shape selected based on the shape of the cutting surface 21 of the cutting tooth 2. Of course, this does not mean that only teardrop-shaped oil reservoirs 15 can be used; other shapes, such as elongated or S-shaped, can also be used. Due to the width of the cutting tooth 2, placing the teardrop-shaped oil reservoir 15 in the center of the cutting tooth 2 ensures the strength of the cutting edges of the cutting tooth 2, preventing the cutting edges from breaking when cutting hair, and extending the service life of the cutting edges of the cutting tooth 2. The addition of the oil storage tank 15 not only allows the addition of solid lubricant before shipment, but also allows the liquid lubricant added through the diversion tank 14 to flow through the trough 142 into the oil storage tank 15 for temporary storage after the solid lubricant is exhausted, thereby extending the time interval for adding lubricant to the pruning blade.

[0068] The trimming blade is integrated with the movable blade before leaving the factory. The diverter groove 14 and oil reservoir 15 provided in the cutting surface 21 of the blade body 1 are filled with solid lubricant before leaving the factory. After the trimming blade is used for a period of time, the solid lubricant in the diverter groove 14 and oil reservoir 15 will be exhausted. Due to the limitation of the movable blade and trimming blade being integrated, it is difficult for the user to disassemble the movable blade to add solid lubricant. This results in frictional resistance between the movable blade and the trimming blade, increasing the temperature rise of the trimming blade and the movable blade, and reducing the comfort of the trimming blade. To this end, an oil filling groove 16 is provided on the cutting surface 21 of the blade body 1. The bottom plane of the oil filling groove 16 is lower than the bottom surface of the diverter groove 14 provided on the cutting surface 21 of the blade body 1, and the oil filling groove 16 is connected to the diverter groove 14 via an inclined groove edge 161. Since the blade body 1 has a certain width, when the user adds liquid lubricant, at most the cutting teeth 2 on the two side edges can be added, while the cutting teeth 2 in the middle area cannot be added with lubricant, resulting in increased friction resistance in the middle area between the trimming blade and the movable knife, thereby increasing the temperature rise of the trimming blade. An oiling groove 16 is provided on the cutting working surface 21 of the blade body 1, so that liquid lubricant can be inserted into the oiling groove 16 through a conduit to squeeze out the lubricant. The lubricant can flow into the diverter groove 14 under the action of its own gravity through the inclined groove edge 161, and then enter the cutting working surface 21 of each cutting tooth 2 through the inclined groove wall 141 at the trough 142 of the diverter groove 14. Part of the lubricant may be pushed out of the cutting teeth 2 by the reciprocating swing of the movable knife, and the other part may enter the oil storage tank 15 for temporary storage, thereby extending the time interval for adding lubricant and ensuring the hair trimming performance of the trimming blade.

[0069] In order to facilitate the installation and fixation of the trimming blade and reduce the friction resistance between the movable knife and the trimming blade, and reduce the temperature rise of the trimming blade, a fastening portion 5 is provided on the side of the blade body 1 opposite to the cutting teeth 2. The width of the fastening portion 5 is smaller than the width of the blade body 1 and its bottom end surface is flush with the cutting working surface 21 on the blade body 1; a plurality of fastening screw holes 51 and a lubrication groove 52 are provided on the fastening portion 5. When in use, the plurality of fastening screw holes 51 can fix the trimming blade; and a lubricating substance can be added to the lubrication groove 52. When the movable knife is in contact with the fastening portion 5 and swings back and forth along the blade body 1 and the fastening portion 5, the lubricating substance in the lubrication groove 52 can reduce the friction resistance between the movable knife and the surface of the fastening portion 5, thereby reducing the temperature rise of the trimming blade and the mating movable knife, and improving the comfort of use of the trimming blade.

[0070] On the basis of the above-mentioned trimming blade, the applicant has also proposed a technical solution of a cutter head assembly, which includes any of the above-mentioned trimming blades with spherical tooth tips.

[0071] Based on the cutter head assembly, the applicant has also proposed a technical solution for a hair trimmer, comprising the aforementioned cutter head assembly, which includes any of the trimming blades with spherical tooth tips described above. Hair trimmers include, but are not limited to, hair clippers, razors, sideburn trimmers, eyebrow trimmers, hair shavers, and hair ball removers.

[0072] The above embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A pruning blade with a spherical tooth tip, comprising a blade body (1), a plurality of cutting teeth (2) arranged at intervals on the blade body (1), and a cutting tooth groove (3) with an opening formed between adjacent cutting teeth (2); characterized in that The invention also includes a spherical segment body (4), wherein the diameter R1 of the spherical segment body is larger than the width H1 and the height H2 of the tooth tip of the cutting tooth (2), and the bottom surface (41) of the spherical segment body is flush with the cutting working surface (21) of the cutting tooth (2); the tooth tip of the cutting tooth (2) is inserted into the spherical segment body (4), so that protrusions higher than the side surfaces are formed on at least two side surfaces around the tooth tip of the cutting tooth (2) except the cutting working surface (21); the spherical segment body (4) and the corresponding cutting tooth (2) are respectively integrally formed with the blade body (1), and at least one contact (42) protruding from the spherical surface is provided on the spherical surface of the spherical segment body (4).

2. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that A chamfered arc R2 integrally formed with the spherical segment body (4) is provided at the edge of the bottom surface (41) of the spherical segment body.

3. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that The height H3 of the spherical segment is greater than half of the diameter R1 of the spherical segment and less than the diameter R1 of the spherical segment.

4. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that The number of the spherical segments (4) is equal to the number of the cutting teeth (2), and the tip of each cutting tooth (2) is inserted into the spherical segment (4) and formed integrally with the spherical segment (4).

5. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that The number of the spherical segments (4) is less than the number of the cutting teeth (2), and the spherical segments (4) are arranged at intervals at the tooth tips of the cutting teeth (2) and are integrally formed with the cutting teeth (2).

6. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that When viewed from the orthographic projection direction of either end of the blade body (1), a contact (42) is provided, which is arranged on the spherical surface of the spherical segment body (4) facing the skin and is an integral structure with the spherical segment body (4).

7. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that The contacts (42) are provided with a plurality of contacts evenly spaced along the spherical surface of the spherical segment body (4) and are integrally formed with the spherical segment body (4).

8. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that Side teeth (11) are respectively provided at both ends of the blade body (1), and a plurality of cutting teeth (2) are spaced between the two side teeth (11), and the width of the side teeth (11) is greater than the width of the cutting teeth (2); an arc-shaped protrusion (12) is provided at the end of each side tooth (11) and is higher than the outer surface in contact with the skin, and one end of the arc-shaped protrusion (12) is flush with the side surface of the side tooth (11) facing outward, and the other end exceeds the side surface of the side tooth (11) close to the cutting tooth (2).

9. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that The cross section of the blade body (1) is a right triangle. A plurality of downwardly recessed sub-guide grooves (13) are provided on the inclined surface of the blade body (1). The width of each sub-guide groove (13) is equal to the width of the tooth cutting groove (3) and is connected to the bottom of the tooth cutting groove (3). The other end of each sub-guide groove (13) extends to the right-angled side of the blade body (1) and passes through the outer surface of the blade body (1).

10. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that A continuous wave-shaped diverter groove (14) is provided on the cutting working surface (21) of the blade body (1) above the tooth root of each cutting tooth (2); a groove wall (141) of the diverter groove (14) close to the cutting tooth (2) is an outwardly inclined surface, and a groove bottom surface is lower than the cutting working surface (21); and a wave trough (142) of the diverter groove (14) is respectively located above the tooth root of each cutting tooth (2), and a wave crest (143) thereof is respectively located above each cutting tooth groove (3).

11. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that A water drop-shaped oil storage groove (15) is provided on the cutting working surface (21) of each cutting tooth (2), and each oil storage groove (15) is placed in the center of the cutting working surface (21) of each cutting tooth (2).

12. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that An oiling groove (16) is provided on the cutting working surface (21) of the blade body (1). The bottom plane of the oiling groove (16) is lower than the bottom surface of the diverter groove (14) provided on the cutting working surface (21) of the blade body (1), and the oiling groove (16) is connected to the diverter groove (14) via an inclined groove edge (161).

13. The trimmer blade with a spherical tooth tip according to claim 1, characterized in that A fastening portion (5) is provided on the side of the blade body (1) opposite to the side where the cutting teeth (2) are provided. The width of the fastening portion (5) is smaller than the width of the blade body (1), and the bottom end surface thereof is flush with the cutting working surface (21) on the blade body (1). A plurality of fastening screw holes (51) and lubrication grooves (52) are provided on the fastening portion (5).

14. A trimming blade with a spherical tooth tip, comprising a blade body (1), a plurality of cutting teeth (2) arranged at intervals on the blade body (1), and a cutting tooth groove (3) with an opening formed between adjacent cutting teeth (2); characterized in that The invention also includes a spherical segment body (4), wherein the diameter R1 of the spherical segment body is larger than the width H1 and the height H2 of the tooth tip of the cutting tooth (2), and the bottom surface (41) of the spherical segment body is flush with the cutting working surface (21) of the cutting tooth (2); the tooth tip of the cutting tooth (2) is inserted into the spherical segment body (4), so that protrusions higher than the side surfaces are formed on at least two side surfaces around the tooth tip of the cutting tooth (2) except the cutting working surface (21); the spherical segment body (4) and the corresponding cutting tooth (2) are respectively integrally formed with the blade body (1), and at least one groove (43) lower than the spherical surface is provided on the spherical surface of the spherical segment body (4).

15. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that A chamfered arc R2 integrally formed with the spherical segment body (4) is provided at the edge of the bottom surface (41) of the spherical segment body.

16. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that The height H3 of the spherical segment is greater than half of the diameter R1 of the spherical segment and less than the diameter R1 of the spherical segment.

17. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that The number of the spherical segments (4) is equal to the number of the cutting teeth (2), and the tip of each cutting tooth (2) is inserted into the spherical segment (4) and formed integrally with the spherical segment (4).

18. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that The number of the spherical segments (4) is less than the number of the cutting teeth (2), and the spherical segments (4) are arranged at intervals at the tooth tips of the cutting teeth (2) and are integrally formed with the cutting teeth (2).

19. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that Side teeth (11) are respectively provided at both ends of the blade body (1), and a plurality of cutting teeth (2) are spaced between the two side teeth (11), and the width of the side teeth (11) is greater than the width of the cutting teeth (2); an arc-shaped protrusion (12) is provided at the end of each side tooth (11) and is higher than the outer surface in contact with the skin, and one end of the arc-shaped protrusion (12) is flush with the side surface of the side tooth (11) facing outward, and the other end exceeds the side surface of the side tooth (11) close to the cutting tooth (2).

20. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that The cross section of the blade body (1) is a right triangle. A plurality of downwardly recessed sub-guide grooves (13) are provided on the inclined surface of the blade body (1). The width of each sub-guide groove (13) is equal to the width of the tooth cutting groove (3) and is connected to the bottom of the tooth cutting groove (3). The other end of each sub-guide groove (13) extends to the right-angled side of the blade body (1) and passes through the outer surface of the blade body (1).

21. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that A continuous wave-shaped diverter groove (14) is provided on the cutting working surface (21) of the blade body (1) above the tooth root of each cutting tooth (2); a groove wall (141) of the diverter groove (14) close to the cutting tooth (2) is an outwardly inclined surface, and a groove bottom surface is lower than the cutting working surface (21); and a wave trough (142) of the diverter groove (14) is respectively located above the tooth root of each cutting tooth (2), and a wave crest (143) thereof is respectively located above each cutting tooth groove (3).

22. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that A water drop-shaped oil storage groove (15) is provided on the cutting working surface (21) of each cutting tooth (2), and each oil storage groove (15) is placed in the center of the cutting working surface (21) of each cutting tooth (2).

23. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that An oiling groove (16) is provided on the cutting working surface (21) of the blade body (1). The bottom plane of the oiling groove (16) is lower than the bottom surface of the diverter groove (14) provided on the cutting working surface (21) of the blade body (1), and the oiling groove (16) is connected to the diverter groove (14) via an inclined groove edge (161).

24. The trimmer blade with a spherical tooth tip according to claim 14, characterized in that A fastening portion (5) is provided on the side of the blade body (1) opposite to the side where the cutting teeth (2) are provided. The width of the fastening portion (5) is smaller than the width of the blade body (1), and the bottom end surface thereof is flush with the cutting working surface (21) on the blade body (1). A plurality of fastening screw holes (51) and lubrication grooves (52) are provided on the fastening portion (5).

25. A cutter head assembly, characterized in that A trimming blade with a spherical tooth tip comprising the trimming blade according to any one of claims 1-13 or 14-24.

26. A hair trimmer, characterized in that Includes the cutter head assembly according to claim 25.

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