Limit comb and clipper assembly with flexible protective layer

Abstract

To provide a limit comb and hair clipper assembly having a soft protective layer which improves the skin protection and comfort of the limit comb, prevents scratches, and enhances structural stability. [Solution] The limit comb with a flexible protective layer has a comb body skeleton consisting of a fixed part 1 and multiple comb teeth 2 arranged in a row, with the roots of the comb teeth connected to the front end of the fixed part, a spine 21 on the back, and limit corners 22 at the front end. A gate 3 is installed horizontally where the fixed part connects to the comb teeth, penetrates the fixed part, and is filled with a flexible covering material. After the flexible material is injected through the gate, it vertically covers the spine and corners of the comb teeth to form a flexible covering layer, and extends horizontally to connect with the covering layers on each comb tooth to form an integrated flexible structure. The hair clipper assembly includes hair clippers and a limit call.

Description

[Technical Field]

[0001] The present invention relates to hair cutting tools, and more particularly to a limit comb and clipper assembly having a flexible protective layer. [Background technology]

[0002] A limit comb (also known as a limiter or hair clipper) typically consists of a single row of comb teeth and a fixed part that connects to the electric hair clipper body. Its main functions are to control the hair length during cutting and prevent the head from coming into direct contact with the skin. Most mainstream products on the market are manufactured in one step using injection molding of hard plastics such as ABS or PC. While easy to manufacture and dimensionally stable, hard plastic combs have sharp corners and edges at the tips, which can cause skin injury during use. This problem is particularly prevalent when cutting short hair or cutting children's hair. To mitigate this risk, some patent documents and products have rounded or thickened the edges of the comb teeth, but these still remain hard plastic structures, limiting the improvement in skin comfort.

[0003] To improve comfort, a plastic framework plus soft materials has emerged. For example, Patent Document 1 (Patent Document 1) provides a hair clipper with a soft limit comb, in which the outside of a hard plastic frame is covered with a soft limit sheet made of rubber or PVC, achieving partial co-injection molding of the two materials in a single injection molding process, thereby preventing sharp edges of the plastic from coming into direct contact with the skin and improving flexibility and safety. However, in this scheme, the soft limit sheet is formed only at the tips of the comb teeth (the part that comes into contact with the skin), and the soft layer does not extend continuously along the spine of the comb teeth. In addition, the resin injection passage is located on the side wall of the frame, and the soft material lacks a lateral connection between the comb teeth. This makes it prone to localized peeling and rolling over after long-term use, affecting the protective effect and durability.

[0004] Another improvement is the spray or dip coating of an elastic soft paint on the outer surface of the comb teeth. Patent Document 2 discloses a limit comb with protective functions. It claims that a soft coating of plastic or elastic paint is formed on the entire outer wall of the hard comb body and comb teeth, reducing the risk of scratches and adding antibacterial particles. However, this post-treatment method has the following problems: It is difficult to accurately control the coating thickness, resulting in large errors in limit accuracy and comb tooth spacing. The soft coating physically adheres to the substrate and is easily peeled off by moisture, heat, detergent, or repeated friction. A secondary spray or dip coating is required during the processing process, increasing the manufacturing steps and increasing the environmental impact.

[0005] In recent years, some patent documents have focused on optimizing the shape of comb teeth or adjusting limit comb structures (such as Patent Document 3), which improve the haircutting effect by changing the pitch and angle of comb teeth or adding an adjustable slider. However, the flexible protection still relies on traditional hard plastics or simple fitting parts, and there is a lack of systematic solutions for the injection path design of the soft coating layer, simultaneous molding with the comb teeth / fixing part, and strong fixing.

[0006] In summary, while prior art technologies recognize the importance of incorporating flexible materials into limit combs, they suffer from the following common limitations: 1. Most of the flexible layer is concentrated at the tips of the comb teeth and does not extend continuously along the spine and corners of the comb teeth, failing to provide sufficient cushioning during the trimming process. 2. The flexible layer is often spray-applied or partially co-injected, which lacks a lateral connection between the comb teeth and is prone to warping and peeling after long-term use. 3. The gate is usually located on the side wall or the front of the comb body, making it difficult to ensure uniform filling and positioning accuracy of the flexible material within the narrow comb tooth group. 4. The post-spray application method requires secondary processing, and the co-injection molding method results in uneven thickness of the flexible layer due to a lack of a liner.

[0007] Therefore, how to provide an appropriate gate at the connection between the fixed part and the comb teeth, so that the flexible coating material continuously covers the spine and corners of the comb teeth in the vertical direction with a single injection, and connect and fix the entire coating layer on multiple comb teeth in the horizontal direction to form an integrated flexible coating layer that is wear-resistant and difficult to peel off, is a technical issue that needs to be solved urgently in this technical field. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] Chinese Patent No. CN202607699U Publication [Patent Document 2] Chinese Patent No. CN202445393U Publication [Patent Document 3] Chinese Patent No. CN216940813U Publication Summary of the Invention [Problem to be solved by the invention]

[0009] In order to solve the above technical problems, the purpose of this invention is to provide a limit comb with a flexible protective layer that provides a gate at the junction of the fixed part and the comb teeth, and is injection molded using a flexible covering material, so that the flexible material continuously covers the spine and corners of each comb tooth vertically, and the flexible covering layers of multiple comb teeth are integrally connected horizontally, achieving both structural integrity and flexibility and comfort, effectively improving the skin affinity, safety and durability of the limit comb during the haircutting process, and solving the technical problems of conventional hard limit comb structures, such as the sharpness that easily hurts the skin, the discontinuousness of the flexible layer that easily peels off, and the complicated process. [Means for solving the problem]

[0010] To achieve the above objectives, the present invention adopts the following technical means:

[0011] The limit comb has a comb skeleton consisting of a fixed part and comb teeth, with multiple comb teeth arranged vertically at the front end of the fixed part, the roots of each comb tooth connected to the fixed part, forming a spine on the front of the comb teeth, and a flexible protective layer at the front end with corners for pushing up the limit comb. A gate is installed horizontally at the joint between the fixed part and the comb teeth, the gate penetrates the fixed part, and a flexible covering material is filled inside the gate, which extends vertically from the gate to cover the spine and corners of each comb tooth and form a flexible covering layer, and extends horizontally to form an integrated flexible crossbar that connects and integrates the flexible covering layers on the multiple comb teeth.

[0012] Preferably, the spine is provided with a support ridge extending from the base to the corner, and the flexible covering material is provided on the outside of the support ridge and is flush with the side surfaces of the comb teeth.

[0013] Preferably, the gate is a plurality of circular holes, and the front positions of the circular holes are disposed between the two comb teeth.

[0014] Preferably, an injection groove communicating with the plurality of circular holes is provided laterally on the rear surface of the gate.

[0015] Preferably, an injection groove is provided horizontally on the rear surface of the gate, and a decorative through groove is provided on one side of the injection groove and communicates with the injection groove.

[0016] Preferably, the material of the comb skeleton is selected from one of ABS, PC, PA and PBT, and the flexible covering material is selected from one of TPE, TPU and thermoplastic silicone rubber.

[0017] Preferably, the fixing portion includes a main plate portion, the plurality of comb teeth are arranged in a vertical direction at the front end of the main plate portion, and a gate is provided horizontally at the junction between the main plate portion and the comb teeth.

[0018] Preferably, first limiting blocks for limiting the movement of the hair clippers are provided on both sides of the gate of the main plate portion, a second limiting block is provided at the rear end of the main plate portion, and a rear locking block for locking the hair clippers is provided on the second limiting block, and a hook portion facing the back is provided at the corner of each comb tooth, and the hook portion forms a front locking block for locking the hair clippers.

[0019] The present invention also provides a hair clipper assembly including a hair clipper and a limit comb, the limit comb having the flexible protective layer.

[0020] Preferably, the limit combs have sizes of 3mm, 6mm, 9mm and 12mm, and the decorative through-grooves form characters of 3mm, 6mm, 9mm and 12mm, respectively. [Effects of the Invention]

[0021] The present invention can achieve the following technical effects through the above technical means.

[0022] 1. Continuous flexible protection of critical areas of the comb teeth: After the flexible covering material is injected through the gate, it extends longitudinally along the spine and corners of each comb tooth to form a flexible covering layer, which can cover the areas that come into direct contact with the scalp during the haircutting process, reducing the risk of skin irritation and scratches, and is particularly suitable for sensitive scenarios such as children, the elderly, and short haircuts.

[0023] 2. Improved structural stability by integrating the flexible layer horizontally: The coating layer not only covers each tooth vertically, but also connects and integrates the coating layers between multiple teeth horizontally, forming a flexible "bridge"-like structure. This prevents the problems of peeling, curling, or warping that occur with conventional flexible materials due to localized forces, and improves structural stability and appearance consistency over long-term use.

[0024] 3. Optimize the injection path design to improve molding efficiency and consistency: A horizontally penetrating gate is provided at the connection point between the fixed part and the comb teeth, and in some embodiments, multiple round holes and horizontal injection grooves are provided, allowing the flexible material to be injected quickly and evenly into each comb tooth path, so that the entire coating structure can be completed with a single injection, reducing manufacturing costs and improving product consistency and production efficiency.

[0025] 4. Flexible material adheres closely to the comb teeth, improving the user experience: The flexible material directly covers the outside of the protrusions or molding lines created when the comb teeth are formed by injection molding, creating a smooth, continuous surface without any obvious steps or sharp edges, further improving the user's feel and smooth cutting experience.

[0026] 5. Supports various functional expansion designs: The gate can be designed as a through-groove or with a lettering structure, which not only improves the liner's continuity, but also can be expanded to include product identification, anti-counterfeiting functions, or general-purpose marking groove structures, providing excellent functional expansion and potential for market differentiation. [Brief explanation of the drawings]

[0027] [Figure 1] 1 is a schematic diagram of a limit comb with a flexible protective layer according to the present invention; [Figure 2] 1 is a schematic front view of a limit comb with a flexible protective layer according to the present invention; [Figure 3] FIG. 1 is a schematic diagram of a comb skeleton. [Figure 4] FIG. 1 is a schematic rear view of the ctenophore skeleton. [Figure 5] FIG. 1 is a schematic front view of a comb skeleton. [Figure 6] 1 is a schematic diagram of the limit comb with a flexible protective layer according to the present invention when installed; FIG. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following detailed description of the technical means in the embodiments of the present invention will be given in conjunction with the embodiments of the present invention, but it goes without saying that the described embodiments are only a part of the embodiments of the present invention and do not represent all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without any creative activity are within the scope of protection of the present invention.

[0029] As shown in Figures 1 and 2, the limit comb with a flexible protective layer according to the present invention comprises a comb skeleton consisting of a fixed part 1 and a plurality of comb teeth 2 arranged side by side. A horizontal gate 3 is provided at the junction of the fixed part 1 and the comb teeth 2, and the gate 3 penetrates the fixed part 1, through which a flexible covering material 4 is injected from the back, extending vertically along the spine 21 and corners 22 of each comb tooth 2 to form a flexible covering layer 41, which is also fused horizontally to form an integral flexible crossbar 42.

[0030] For ease of explanation, hereinafter, the side of the fixing part 1 closest to where the hair clippers are attached will be referred to as the back side, and the side that comes into contact with the hair / skin will be referred to as the front side.

[0031] Example 1 As shown in Figures 3, 4, and 5, the fixing part 1 is a rectangular main body plate 11, the front end of which is integrally connected to a plurality of comb teeth 2. Extending from both sides of the main body plate 11 are first limiting blocks 12, and a second limiting block 13 is erected at the rear end. A rear locking block 131 is machined on the upper edge of the second limiting block 13, and the corners 22 of the comb teeth 2 are bent forward to form hooks 23, which serve as front locking blocks. The limiting blocks and locking blocks allow for quick locking and detachment from the hair clipper head.

[0032] The gates 3 are designed as multiple circular holes 31 with diameters of 1.2 to 1.5 mm, which penetrate the main plate 11 from the back to the front and are evenly spaced between adjacent comb teeth 2. The injection ends of the circular holes 31 can be widened by 0.3 mm using a 90° conical tool to reduce injection shear heat. After being injected through the circular holes 31, the flexible coating material 4 first fills the recesses on the back and then flows forward along the spines 21 and corners 22 of each comb tooth 2. Surface tension automatically gathers the material, merging it at the front to form a flexible coating layer 41 with a thickness of 0.4 to 0.6 mm. The side edges of the coating layer 41 between adjacent comb teeth 2 come into contact and fuse before solidifying, forming a flexible crossbar 42 that is connected laterally as a whole.

[0033] With the above structure, no cracks or peeling were observed in the flexible layer after 20 water washes and 5,000 friction tests (load 2N, reciprocating stroke 10mm).

[0034] Example 2 As shown in Figures 3, 4, and 5, based on Example 1, a horizontal injection groove 32 measuring 1.0 mm wide and 1.2 mm deep is provided on the back of gate 3, located at the junction between main plate 11 and the base of comb teeth 2. The product model number "1.5 mm" is engraved on the front wall of injection groove 32, forming a decorative through-groove 33 connected to groove 32. This not only facilitates rapid filling of flexible coating material 4 along the length of the groove, but also allows the user to easily identify the limit length, as the solidified coating layer forms a convex mark on the front. After injection is complete, decorative through-groove 33 is filled with the same color flexible material, and its height is approximately lower than the front of comb teeth 2, preventing the formation of protruding burrs.

[0035] Example 3 As shown in Figures 3, 4, and 5, to further improve the performance of the comb teeth 2 based on Example 1, support ridges 24 measuring 0.3 mm high from the base to the corners 22 and 0.6 mm wide at the top can be provided on the back of the comb teeth 2. The gates 3 extend from the back of the main plate 11 to the bottom of the support ridges 24. The flexible coating material 4 preferentially fills the support ridges 24 and the small gaps on both sides during injection, forming a "skin-and-bone" composite structure after solidification, significantly improving the overall bending rigidity and concentrated load absorption capacity of the comb teeth 2. When a 3N downward bending load was applied to a 16mm long comb tooth test specimen, the peak deflection decreased from 2.4 mm (comparative test specimen without ridges) to 1.6 mm (Example), resulting in an improvement in bending strength by approximately 33%. Furthermore, because the flexible layer and the outer surfaces of the support ridges are integrally covered, the sides of the comb teeth are flush with the flexible layer, resulting in a smooth appearance.

[0036] As shown in Figure 6, the user inserts the fixing part 1 on the back of the limit comb into the hair clipper head, the first limiting block 12 prevents it from wobbling left and right, the second limiting block 13 and rear locking block 131 abut against the hair clipper housing, and the hook part 23 of the comb teeth 2 engages with the front edge of the head, completing the locking through three-point positioning. During haircutting, the corners 22 of the comb teeth 2 come into contact with the scalp, and the flexible covering layer 41 provides a cushioning function. During cleaning, the comb can be brushed with running warm water and mild detergent, and immersed in hot water below 65°C for two minutes without affecting the adhesion of the covering layer.

[0037] The above is a description of the embodiments of the present invention. The above description of the disclosed embodiments will enable those skilled in the art to make or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments disclosed herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The limit comb has a comb skeleton consisting of a fixed part (1) and comb teeth (2), a plurality of the comb teeth (2) are arranged in a vertical line at the front end of the fixed part (1), the roots of the comb teeth (2) are connected to the fixed part (1), a spine (21) is formed on the front of the comb teeth (2), and a flexible protective layer is formed at the front end with a corner (22) for pushing up the limit comb, and a gate (3) is provided horizontally at the joint between the fixed part (1) and the comb teeth (2), and the gate ( a gate (3) penetrating the fixed portion (1), a flexible covering material (4) filled in the gate (3), the flexible covering material (4) extending vertically from the gate (3) to cover the spine (21) and the corners (22) of each of the comb teeth (2) and forming a flexible covering layer, and extending horizontally to form an integral flexible crossbar (42), connecting and integrating the flexible covering layers on multiple comb teeth (2).

2. 2. The limit comb with a flexible protective layer according to claim 1, wherein the spine (21) is provided with a support ridge (24) extending from the base to the corner (22), and the flexible covering material (4) is covered on the outside of the support ridge (24) and is flush with the side surfaces of the comb teeth (2).

3. The limit comb with a flexible protective layer according to claim 1, characterized in that the gate (3) is a plurality of round holes (31), and the front positions of the round holes (31) are arranged between two of the comb teeth (2).

4. The limit comb with a flexible protective layer according to claim 3, characterized in that an injection groove (32) communicating with the plurality of round holes (31) is provided laterally on the back surface of the gate (3).

5. The limit comb with a flexible protective layer according to claim 1, characterized in that the injection groove (32) is provided horizontally on the back surface of the gate (3), and a decorative through groove (33) communicating with the injection groove (32) is provided on one side of the injection groove (32).

6. 2. The limit comb with flexible protective layer according to claim 1, characterized in that the material of the comb body skeleton is selected from one of ABS, PC, PA and PBT, and the flexible covering material (4) is selected from one of TPE, TPU and thermoplastic silicone rubber.

7. The limit comb with a flexible protective layer according to claim 1, characterized in that the fixed portion (1) comprises a main body plate portion (11), the plurality of comb teeth (2) are arranged in a vertical line at the front end of the main body plate portion (11), and the gate (3) is arranged horizontally at the junction between the main body plate portion (11) and the comb teeth (2).

8. 8. The limit comb with a flexible protective layer according to claim 7, characterized in that first limiting blocks (12) for limiting the movement of the hair clippers are provided on both sides of the gate (3) of the main plate portion (11), a second limiting block (13) is provided at the rear end of the main plate portion (11), and a rear locking block (131) for locking the hair clippers is provided on the second limiting block (13), and a hook portion (23) is provided at the corner portion (22) of each of the comb teeth (2) toward the rear, and the hook portion (23) forms a front locking block for locking the hair clippers.

9. A hair clipper assembly comprising a hair clipper and a limit comb, characterized in that the limit comb uses a limit comb having a flexible protective layer according to any one of claims 1 to 8.

10. 10. The hair clipper assembly according to claim 9, wherein the limit combs have sizes of 3 mm, 6 mm, 9 mm and 12 mm, and the decorative through grooves (33) form the characters 3 mm, 6 mm, 9 mm and 12 mm, respectively.

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