A cutting knife with a pvd coating and a cutting method
By introducing a lever structure and cushioning design into the cutting scissors, and applying a PVD coating to the scissor surface, the problems of unbalanced weight, hand-gripping, and poor durability of the cutting scissors have been solved, resulting in improved wear resistance and sharpness, and significantly extended service life.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- BMAN MFG ZHE JIANG
- Filing Date
- 2026-05-06
- Publication Date
- 2026-07-21
AI Technical Summary
Existing cutting scissors suffer from problems such as weight imbalance, hand abrasion, poor durability, and short service life.
Employing a unique lever and buffer structure design, and applying a PVD coating to the scissor surface, combined with hinge and lever components, it forms a continuous shearing force to reduce the force exerted by the user, while uniformly coating the metal surface with a wear-resistant coating.
It improves the wear resistance and sharpness of the scissors, significantly extends their service life, enhances the product's quality, and reduces the difficulty of operation for users.
Smart Images
Figure CN122425754A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of scissors technology, specifically relating to a PVD-coated cutting scissors and a cutting method. Through the innovative application of a uniquely designed lever structure and buffer structure combined with the PVD coating process, the wear resistance, service life, and sharpness of the scissors are greatly increased. Background Technology
[0002] Common cutting scissors consist of two hinged blades, with the blade at one end and the handle at the other. The two blades interlock to cut materials, utilizing a lever principle. Users need to hold the handle and clamp the two blades together. While various types of cutting scissors are available on the market, some still present problems. For example, some cutting scissors have an unbalanced weight distribution, making them difficult to use and causing hand fatigue. Additionally, most are made entirely of metal, which can cause hand abrasions after prolonged use. To address the aforementioned shortcomings, Chinese patent CN202120299266.6 improves upon existing cutting scissors. Specifically, it employs a cutting scissor comprising a left handle, a right handle, a counterweight, a left blade, a right blade, a nut, a screw, a small-hole washer, a large-hole washer, and a counterweight fixing pin. The left handle is attached to the rear end of the left blade, and the right handle is attached to the rear end of the right blade. A counterweight is also attached to the rear end of the right handle. The left and right blades are connected by a nut and a screw, with a small-hole washer and a large-hole washer installed between them. The counterweight is connected to the right handle by a counterweight fixing pin. This cutting scissor features a counterweight at the end of the handle, centered the overall weight of the scissors, ensuring balanced weight and more stable cutting without hand fatigue. Furthermore, both the left and right blades are made of stainless steel, which is less prone to rust and easier to maintain compared to traditional carbon steel cutting scissors. The outer layer of the handle is made of hard engineering plastic, while the inner layer in contact with the skin is made of soft material, preventing chafing and making it suitable for prolonged use. Although the aforementioned patent can achieve overall balance in the use of scissors, and the use of stainless steel blades and hard engineering plastic handles improves service life and user experience, it is similar to existing cutting scissors on the market, which are basically ordinary uncoated scissors with simple technology and structure, low-end quality, poor durability and short service life. Therefore, there is an urgent need for a new type of cutting scissors that can solve the above technical problems. Based on this, the purpose of the present invention is to address the shortcomings of the prior art by providing a PVD-coated cutting scissors and a cutting method, thereby solving the problems of poor durability and short service life of the cutting scissors in the prior art. Summary of the Invention
[0003] To address the shortcomings of existing technologies, the present invention provides a PVD-coated cutting scissors, comprising a finger blade, a thumb blade, a finger handle, a thumb handle, a hinge assembly, a lever assembly, and a buffer assembly. The finger handle is fixedly mounted on the end of the finger blade, and the thumb handle is fixedly mounted on the end of the thumb blade. The finger blade and the thumb blade are hinged together by the hinge assembly. A lever assembly is provided between the finger blade and the thumb blade, and a buffer assembly is provided between the finger blade and the finger handle. The metal surfaces of both the finger blade and the thumb blade have a PVD coating.
[0004] Preferably, the finger blade includes a finger blade and a first connecting rod integrally disposed at the base of the finger blade. The end of the first connecting rod away from the finger blade is fixedly installed with the handle of the finger blade, and the first connecting rod is arranged in the same direction as the extension of the finger blade.
[0005] Preferably, the thumb blade includes a thumb blade and a second connecting rod integrally disposed at the base of the thumb blade. The end of the second connecting rod away from the thumb blade is fixedly installed with the thumb blade handle. The second connecting rod is inclined in a direction away from the thumb blade handle. The thumb blade and the finger blade are hinged together by the hinge assembly.
[0006] Preferably, the hinge assembly includes a pin disposed on the thumb blade and a locking screw disposed on the corresponding finger blade, the locking screw locking the pin to form a hinge structure.
[0007] Preferably, the lever assembly includes a pin disposed on the finger blade, the finger blade handle having a mounting portion extending towards the end opposite to the finger hole of the finger blade handle, the mounting portion having a through mounting hole, and the pin being received in the mounting hole.
[0008] Preferably, the buffer assembly includes a first buffer and a second buffer located between two opposing surfaces of the finger blade and the finger blade handle, wherein the first buffer is a buffer pad sleeved on the circumferential surface of the hook and attached to the surface of the finger blade, and the second buffer is a stepped buffer pad installed in the mounting hole where the finger blade mates with the locking screw.
[0009] Preferably, the second buffer is a fixing block, which is installed by engaging the mounting hole on the finger blade through the stepped structure at its lower end, and its upper end is accommodated in the stepped groove on the handle of the finger blade. After assembly, it is fixed by a locking screw. The line connecting the central axis of the hook and the central axis of the fixing block forms a lever effect and continuously applies pressure when the scissors are used for cutting.
[0010] Preferably, the buffer assembly further includes a buffer limiting part disposed on the thumb blade handle, the structure of which is a notch, the notch being used to create a gap between the finger blade and the thumb blade handle when the finger blade and the thumb blade are fully closed.
[0011] Preferably, the finger blade and thumb blade are made of high-carbon stainless steel.
[0012] Preferably, the hook is made of 304 stainless steel; the fixing block is made of POM engineering plastic; the nail post is made of PA6+10%GF plastic; and the locking screw is a 304 triangular screw.
[0013] Secondly, the present invention provides a cutting method that utilizes the hinge assembly of the above-mentioned cutting scissors to achieve the cutting effect during the process of the two cutting scissor blades moving from an open state to a closed state. A lever assembly is provided between the two cutting scissor blades so that the cutting scissors form a lever effect during use and continuously apply pressure to one of the cutting scissor blades, thereby achieving a labor-saving effect.
[0014] Compared with existing technology devices, the advantages of this invention are: This invention utilizes an innovative product structure design. During the cutting and closing process, when the two blades are fully closed, a uniquely designed lever and buffer structure continuously applies shearing force, achieving a labor-saving effect and reducing the force exerted by the user. It also innovatively incorporates a PVD wear-resistant coating process, resulting in a product surface similar to that of a machined coated milling cutter. The wear-resistant coating adheres evenly to the entire metal surface of the product, including the blades, significantly increasing the product's abrasion resistance and the durability of its sharpness. This provides a new application scenario for the high-end market of cutting scissors. Attached Figure Description
[0015] Figure 1 This is a schematic diagram of the assembly structure of the cutting scissors in this invention; Figure 2 This is a schematic diagram of the structure of the finger blade and thumb blade in this invention; Figure 3 The six views are of the completed cutting scissors assembly in this invention. Figure 4 This is a schematic diagram of the cutting scissors in the open state of the present invention; Figure 5 This is a schematic diagram of the closed state of the cutting scissors in this invention; Figure 6 This is a schematic diagram of the closed state of the cutting scissors in this invention; The markings in the attached diagram are: 1-finger handle, 2-finger blade, 3-hanging nail, 4-fixing block, 5-thumb handle, 6-thumb blade, 7-pin, 8-locking screw. Detailed Implementation
[0016] The following is combined with Figures 1-6 The present invention will be further described with reference to specific embodiments.
[0017] See appendix Figures 1-5 This invention provides a PVD-coated cutting scissors, comprising a finger blade 2, a thumb blade 6, a finger handle 1, a thumb handle 5, a hinge assembly, a lever assembly, and a buffer assembly. The finger handle 1 is fixedly mounted on the end of the finger blade 2, and the thumb handle 5 is fixedly mounted on the end of the thumb blade 6. The finger blade 2 and thumb blade 6 are hinged together by the hinge assembly. A lever assembly is provided between the finger blade 2 and thumb blade 6, and a buffer assembly is provided between the finger blade 2 and finger handle 1. The metal surfaces of both the finger blade 2 and thumb blade 6 have a PVD coating. Both the finger blade 2 and thumb blade 6 undergo PVD coating before assembly or injection molding, followed by post-processing, and then assembly. This invention, through a unique structural design and innovative application of PVD coating technology, significantly increases the wear resistance and sharpness of the scissors, making their lifespan five times that of ordinary scissors, thus significantly enhancing the product's quality. The structure and process of this invention have low investment costs, are suitable for mass production, and enhance product competitiveness. The finger blade 2 includes a finger blade and a first connecting rod integrally disposed at the root of the finger blade. The end of the first connecting rod away from the finger blade is fixedly installed with the finger blade handle 1. The first connecting rod is arranged to coincide with the extension direction of the finger blade 2. The thumb blade 6 includes a thumb blade and a second connecting rod integrally disposed at the base of the thumb blade. The end of the second connecting rod away from the thumb blade is fixedly installed with the thumb blade handle 5. The second connecting rod is inclined in a direction away from the thumb blade handle. The finger blade and the thumb blade are hinged together by the hinge assembly. The hinge assembly includes a pin 7 disposed on the thumb blade 6 and a locking screw 8 disposed on the finger blade 2, wherein the locking screw 8 locks the pin 7 to form a hinge structure. The lever assembly includes a pin 3 disposed on the finger blade 2, and the finger blade handle 1 has a mounting portion extending toward the end opposite to the finger hole of the finger blade handle 1, and the mounting portion is provided with a through mounting hole, and the pin 3 is accommodated in the mounting hole; The buffer assembly includes a first buffer and a second buffer located between two opposing surfaces of the finger blade 2 and the finger blade handle 1. The first buffer is a buffer pad that is sleeved on the circumferential surface of the hook 3 and attached to the surface of the finger blade 2. The second buffer is a stepped buffer pad that is installed in the mounting hole of the finger blade 2 that mates with the locking screw 8. The first buffer and the hook 3 can be connected separately, or the first buffer can be integrally injection molded onto the surface of the hook 3. The second buffer is a fixing block 4. The fixing block 4 is installed by engaging the mounting hole on the finger blade 2 through the stepped structure at its lower end. Its upper end is accommodated in the stepped groove on the finger blade handle 1. After assembly, it is fixed by the locking screw 8. The line formed by the central axis of the hanging nail 3 and the central axis of the fixing block 4 forms a lever and continuously applies pressure when the scissors are used for cutting. Its structural principle is that the precise relative positions of the hanging nail 3 and the fixing block 4 form an invisible lever after assembly. In use, it combines the thumb handle 5, thumb blade 6, nail post 7, and finger handle 1. Through the precise fit between the nail post 7 and the fixing block 4, a lever is formed during product cutting to continuously apply pressure, thereby achieving a labor-saving structure. When the scissors are used for cutting, the force of this lever is always applied, thus achieving the effect of saving labor.
[0018] The buffer assembly also includes a buffer limiting part disposed on the thumb blade handle 5, which has a notch structure. The notch is used to create a gap between the finger blade 2 and the thumb blade handle 5 when the finger blade 2 and the thumb blade 6 are fully closed. The buffer limiting device is designed to prevent overcutting (overcutting is the cross-cutting of the blades when the two metal blades of the scissors are fully closed). The finger blade 2 and thumb blade 6 are made of high-carbon stainless steel; the hanging nail 3 is made of 304 stainless steel; the fixing block 4 is made of POM engineering plastic; the nail post 7 is made of PA6+10%GF plastic; the locking screw 8 is a triangular screw made of 304 stainless steel; the finger blade handle 1 and thumb blade handle 5 are injection molded using PA6+20%GF.
[0019] like Figure 6 As shown, the present invention provides a cutting method that utilizes the hinge assembly of the cutting scissors to achieve the cutting effect by moving the two cutting scissor blades from an open state to a closed state. A lever assembly is set between the two cutting scissor blades so that the cutting scissors form a lever effect during use and continuously apply pressure to one of the cutting scissor blades, thereby achieving a labor-saving effect.
[0020] This invention utilizes an innovative product structure design. During the cutting and closing process, when the two blades are fully closed, a uniquely designed lever and buffer structure continuously applies shearing force, achieving a labor-saving effect and reducing the force exerted by the user. It also innovatively incorporates a PVD wear-resistant coating process, resulting in a product surface similar to that of a machined coated milling cutter. The wear-resistant coating adheres evenly to the entire metal surface of the product, including the blades, significantly increasing the product's friction resistance and the durability of its sharpness, thus providing application scenarios for the high-end market of cutting scissors.
[0021] The above description only illustrates the preferred technical solution of the present invention. Any modifications that may be made by those skilled in the art to certain parts thereof all reflect the principles of the present invention and should be within the technical scope of the present invention.
Claims
1. A pair of cutting scissors with a PVD coating, characterized in that, It includes a finger blade (2), a thumb blade (6), a finger blade handle (1), a thumb blade handle (5), a hinge assembly, a lever assembly, and a buffer assembly; the finger blade handle (1) is fixedly installed at the end of the finger blade (2), the thumb blade handle (5) is fixedly installed at the end of the thumb blade (6), and the finger blade (2) and the thumb blade (6) are hinged by the hinge assembly; a lever assembly is provided between the finger blade (2) and the thumb blade (6), and a buffer assembly is provided between the finger blade (2) and the finger blade handle (1); the metal surfaces of the finger blade (2) and the thumb blade (6) are both coated with PVD.
2. The PVD-coated cutting scissors as described in claim 1, characterized in that, The finger blade (2) includes a finger blade and a first connecting rod integrally disposed at the root of the finger blade. The end of the first connecting rod away from the finger blade is fixedly installed with the finger blade handle (1). The first connecting rod is disposed in the same direction as the extension of the finger blade (2).
3. A PVD-coated cutting scissors according to claim 2, characterized in that, The thumb blade (6) includes a thumb blade and a second connecting rod integrally disposed at the root of the thumb blade. The end of the second connecting rod away from the thumb blade is fixedly installed with the thumb handle (5). The second connecting rod is inclined in a direction away from the thumb handle. The finger blade and the thumb blade are hinged by the hinge assembly.
4. A PVD-coated cutting scissors as described in claim 3, characterized in that, The hinge assembly includes a pin (7) disposed on the thumb blade (6) and a locking screw (8) disposed on the finger blade (2), the locking screw (8) locking the pin (7) to form a hinge structure.
5. A PVD-coated cutting scissors as described in claim 1, characterized in that, The lever assembly includes a pin (3) disposed on the finger blade (2), the finger blade handle (1) having a mounting portion extending toward the end opposite to the finger hole of the finger blade handle (1), the mounting portion having a through mounting hole, and the pin (3) being accommodated in the mounting hole.
6. A PVD-coated cutting scissors as described in claim 5, characterized in that, The buffer assembly includes a first buffer and a second buffer located between the two opposing surfaces of the finger blade (2) and the finger blade handle (1). The first buffer is a buffer pad that is sleeved on the circumferential surface of the hook (3) and attached to the surface of the finger blade (2). The second buffer is a stepped buffer pad that is installed in the mounting hole of the finger blade (2) that mates with the locking screw (8).
7. A PVD-coated cutting scissors as described in claim 6, characterized in that, The second buffer is a fixing block (4). The fixing block (4) is installed by the mounting hole on the finger blade (2) through the stepped structure at its lower end. Its upper end is accommodated in the stepped groove on the finger blade handle (1). After assembly, it is fixed by the locking screw (8). The line formed by the central axis of the hook (3) and the central axis of the fixing block (4) forms a lever effect and continuously applies pressure when the scissors are used for cutting.
8. A PVD-coated cutting scissors as described in claim 7, characterized in that, The buffer assembly also includes a buffer limiting part disposed on the thumb blade handle (5), which has a notch structure, the notch being used to create a gap between the finger blade (2) and the thumb blade handle (5) when the finger blade (2) and the thumb blade (6) are fully closed.
9. A PVD-coated cutting scissors as described in claim 8, characterized in that, The finger blade (2) and thumb blade (6) are made of high-carbon stainless steel; the hanging nail (3) is made of 304 stainless steel; the fixing block (4) is made of POM engineering plastic; the nail post (7) is made of PA6+10%GF plastic; and the locking screw (8) is a 304 triangular screw.
10. A cutting method, comprising using a PVD-coated cutting scissors as described in any one of claims 1-9, wherein the cutting effect is achieved by utilizing the hinge assembly of the cutting scissors to realize the cutting effect during the process of the two cutting blades moving from an open state to a closed state, characterized in that, A lever assembly is installed between the two cutting blades, so that the cutting blades create a lever effect during use and continuously apply pressure to one of the cutting blades, thereby achieving the effect of saving effort.