Nail clippers consisting of an upper blade and a lower blade with different physical properties

Abstract

This invention relates to a nail clipper whose lower part is made of a non-elastic material and whose upper part is made of an elastic material, thereby preventing damage and loss of durability due to the collision of sharp, thin metal blades. This invention combines the advantages of two aspects: firstly, although it is a non-elastic material, it allows for various designs using metal injection molding (MIM); secondly, by utilizing the elasticity of rolled steel, it aims to manufacture a durable nail clipper that can effectively trim nails while avoiding contact and direct collision between blade tips. Therefore, although its appearance is similar to existing pressure plate nail clippers, it is fundamentally different, achieving the objective of this invention by forming a non-elastic material manufactured using the MIM process in the lower part of the nail clipper body and using an elastic material made of rolled steel in the upper part.

Description

Technical Field

[0001] The present invention relates to a nail clipper, and more specifically, to a nail clipper consisting of an upper blade and a lower blade with different physical properties, wherein the upper part having the upper blade has elastic properties and the lower part having the lower blade has inelastic properties. Background Technology

[0002] Nail clippers trim nails by bringing together an upper and lower blade. The lower and upper parts of the blades, which are formed on one side, have the same properties. They can either have a shape where both the lower and upper parts are appropriately elastic, or they can have a shape where neither the upper nor lower parts are elastic and they are combined with a spring.

[0003] The former, the flexible nail clipper, is the most common form. The other ends of the lower and upper parts are fixed by welding or other means. A pin passes through the upper and lower blades of the upper and lower parts, and the pin is connected to the pressure plate.

[0004] The lower and upper components are made of rolled carbon steel or stainless steel plates, which are manufactured by stamping, cutting, and heat treatment processes, thus giving them appropriate elasticity.

[0005] When trimming nails, if you press the clipper, the elastic upper and lower parts will bend together to trim the nails. If you remove the pressure from the clipper, both will return to their original positions.

[0006] Because the upper and lower parts are plate-shaped and the structure is very simple, this form has no problem in making nail clippers and has been used for a long time. However, with the development of technology and changes in consumer demand, there is a need for more complex and functional nail clippers.

[0007] However, nail clippers manufactured by stamping using the rolled steel sheet as material are subject to many limitations in terms of free forming and post-processing, making it difficult to achieve a variety of designs. As a result, it is difficult to diversify the products. For example, it is difficult to manufacture containers with an open top three-dimensional structure by stamping, which are used to collect nails trimmed by the lower part.

[0008] Recently, in order to solve the problem of multiple designs, we have tried to manufacture nail clippers using metal injection molding (MIM, Metal Injection Mold).

[0009] This nail clipper has an upper blade and a lower blade formed on one side of the upper and lower parts, respectively, and the other side serves as the handle. They are connected to each other by an X-shaped hinge. A separate elastic component (coil spring, leaf spring, etc.) is used between the two parts to open the upper and lower blades for use.

[0010] This type of non-elastic nail clipper sharpens its blade by gradually reducing the thickness of the blade tip to zero during the sharpening process. When trimming nails, the tips of the upper and lower blades collide directly at such a thin point. In this process, even the hardest metal will quickly become dull and damaged after repeated direct impacts with a blade that is almost zero thickness. The durability of the blade when trimming nails differs significantly from its durability when impacting other metals.

[0011] Nevertheless, because the materials for the upper and lower cutting edges manufactured by existing forging processes are treated with an appropriate forging ratio, the metal grains are refined, the structure is homogenized, the strength and hardness are increased, and the ductility and impact resistance are improved. Therefore, even if the cutting edge is struck, adequate durability can be guaranteed. However, for the MIM process, because the powder particles are bonded together by sintering after dewaxing, the tensile strength or impact strength is much weaker than that of rolled steel or forgings.

[0012] Therefore, if you want to utilize MIM (Metal Injection Molding) components to achieve various designs, preventing the blade tips from colliding during use is essential for maintaining product durability. If both the upper and lower blades are manufactured solely using MIM, the blade tips will inevitably collide directly. Upper and lower blades manufactured solely using MIM only improve appearance, creating a shape similar to existing forged blades, ultimately resulting in a product that neglects durability.

[0013] In summary, existing nail clippers face challenges in producing complex 3D designs using a stamping process, limiting the manufacture to simpler forms.

[0014] On the other hand, non-elastic nail clippers manufactured using the MIM process have problems such as increased manufacturing complexity and cost due to the use of separate elastic components, and dulling caused by the collision between the upper and lower blades.

[0015] Korean Patent No. 10-0465614 relates to an elastic type manufactured by stamping process; Korean Patent No. 10-2017-0124659 relates to an elastic type formed by extrusion of non-ferrous metals; and Korean Patent No. 10-1367714 relates to an injection molding process and a sintering process using titanium powder.

[0016] Existing technical documents

[0017] Patent documents

[0018] Patent Document 0001: Korean Patent No. 10-0465614

[0019] Patent Document 0002: Korean Patent Publication No. 10-2017-0124659

[0020] Patent Document 0003: Korean Patent No. 10-1367714 Summary of the Invention

[0021] The present invention addresses the aforementioned problem by providing a nail clipper composed of an upper blade and a lower blade with different physical properties. Specifically, the lower component is made of a non-elastic component, while the upper component, which is a relative component and pressed by a pressure plate, is made of an elastic component. Thus, the nail clipper is constructed without using a separate elastic component. Through the combination of elasticity and non-elasticity, the upper and lower blades do not collide with each other but instead shift inward, allowing for nail trimming without producing burrs.

[0022] The present invention relates to a nail clipper composed of an upper blade and a lower blade with different physical properties, characterized in that it comprises: a lower component made of a non-elastic material, having a lower blade formed at one end; an upper component made of an elastic material, having an upper blade formed at one end, and being integrally formed with the lower component on the opposite side by riveting or welding; a pin penetrating one side of the lower component and the upper component; and a pressure plate connected to the pin, which closes the upper blade and the lower blade by pressing the upper component, wherein the lower component is a non-elastic material and will not displace, and the upper component undergoes elastic deformation under the pressure of the pressure plate.

[0023] Preferably, the lower component is manufactured by metal injection molding (MIM), and the upper component is manufactured by stamping rolled steel sheet.

[0024] The nail clippers of the present invention, which consist of an upper blade and a lower blade with different physical properties, have the following effects.

[0025] If the lower part is made of a non-elastic material and the upper part is made of an elastomer to manufacture nail clippers, the length of the upper part will be slightly shortened during the manufacturing process. Therefore, if the upper part is pressed, the upper and lower blades will not collide directly with each other but will shift inward. As a result, the blade tip is not easily worn, thus greatly improving durability.

[0026] Furthermore, the effect of this phenomenon is that no tiny burrs are generated at the nail tips when trimming nails, allowing for a smooth trimming process. Therefore, unnecessary trimming to remove burrs is eliminated, making it easier to use.

[0027] Furthermore, compared to upper and lower parts manufactured entirely through stamping processes, the combination of stamping and MIM processes allows for a wider range of designs to be produced for nail clippers. Moreover, when manufacturing through MIM, the separate springs and hinge connections between the upper and lower parts that must be used can be omitted, making assembly easier. Additionally, the lower labor cost rate of the upper part allows for a lower unit price (1 / 5 to 1 / 10 of that of the MIM process).

[0028] Furthermore, since the lower and upper parts, manufactured separately using MIM and stamping processes, offer different two-tone effects, monotony in appearance can be avoided. Attached Figure Description

[0029] Figure 1 This is a perspective view of the nail clippers of the present invention, which consist of an upper blade and a lower blade with different physical properties.

[0030] Figure 2 This is an exploded perspective view of the nail clippers of the present invention, which consist of an upper blade and a lower blade with different physical properties.

[0031] Figure 3 This is a perspective view illustrating the grinding of the blades and the bending of the upper component during the manufacturing process of the nail clippers of the present invention, which consist of an upper blade and a lower blade with different physical properties.

[0032] Figure 4 This is a diagram illustrating the operational state of the nail clippers of the present invention, which consist of an upper blade and a lower blade with different physical properties.

[0033] Explanation of reference numerals in the attached figures

[0034] 10: Lower part 11: Lower blade

[0035] 20: Upper component 21: Upper blade

[0036] 12, 22: Through holes for pins

[0037] 30: Pin shaft; 31: Pressure plate assembly groove

[0038] 32: Locking part

[0039] 40: Pressure plate 41: Protrusion

[0040] 42: Locking lever Detailed Implementation

[0041] In the following description of the invention, detailed descriptions of relevant well-known functions or structures will be omitted if it is deemed unnecessary to obscure the spirit of the invention. Furthermore, the terminology used thereafter is defined in consideration of the functions in the invention and may vary depending on the intentions or practices of the user or operator. Therefore, its definition should be determined based on the overall content of this specification.

[0042] like Figure 1 and Figure 2 As shown, the nail clipper 100 of the present invention, composed of an upper blade and a lower blade with different physical properties, includes: a lower component 10, comprising a lower blade 11 as the lower blade component; an upper component 20, comprising an upper blade 21 as the upper blade component; a pin 30, having a locking part 32 formed at the lower part and a pressure plate assembly groove 31 formed at the upper part, wherein the pin 30 is inserted into the pin through hole 12 of the lower component 10 and locked on the bottom surface of the lower component 10, and passes through the pin through hole 22 of the upper component 20 and engages with the locking rod 42 of the pressure plate, thereby enabling the upper component 20 to work; and a pressure plate 40, which, by applying a small force to press the upper component 20, moves the upper blade 21 toward the lower blade 11. Either the lower component 10 or the upper component 20 is a non-elastic body without elasticity, and the other is an elastic body with elasticity. Preferably, the lower component 10 is a non-elastic body and the upper component 20 is an elastic body, as detailed below.

[0043] Preferably, the lower part 10 is manufactured using the MIM process, which is non-elastic. For example, it is not only very easy to form an upper opening-type container for accommodating nails trimmed to the inside of the lower blade 11, but it can also be used to manufacture a variety of three-dimensional design products.

[0044] The upper part 20 is made of rolled steel plate of carbon steel or stainless steel, which is manufactured by stamping, cutting and heat treatment process, so as to be elastic. The other side of the blade is connected to the lower part 10 by welding or riveting. A pin through hole 22 for the pin 30 to pass through is formed at a position adjacent to the upper blade 21 at one end. With the above connection structure, if the pin 30 is pulled by operating the pressure plate 40, the upper part 20 is pressed and lowered. When the force applied to the pressure plate 40 disappears, it returns to the initial position by its own elasticity.

[0045] For example, the bottom of the pin 30 is rotatably fixed to the locking part 32 through the pin through hole 12 of the lower part 10, and the upper part passes through the pin through hole 22 of the upper part 20. The pressure plate assembly groove 31 formed at the upper end protrudes to the upper part of the upper part 20. The connection structure with the pressure plate 40 can be in various ways.

[0046] One end of the pressure plate 40 is rotatably connected to the pressure plate assembly groove 31, and a protrusion 41 is included on the rear side of the one end, which presses the upper component 20 by means of a lever. The protrusion 41 serves as the point of action for pressing the upper component 20, and is formed by bending or by adding a separate protrusion.

[0047] Normally, the protrusion 41 faces upwards. When trimming nails, the pressure plate 40 is flipped up and down to face the upper part 20.

[0048] The manufacturing process of this invention will be described below.

[0049] 1. Component manufacturing

[0050] The lower component 10 is manufactured by MIM process, and the upper component 20 is manufactured by stamping process. The lower component 10 and the upper component 20 are in the state before the lower blade 11 and the upper blade 21 are ground.

[0051] Furthermore, the pin 30 and the pressure plate 40 can be manufactured using known manufacturing methods. The pressure plate 40 can be manufactured using methods such as MIM process, stamping process, or die casting process. These processes are all known, therefore, specific descriptions will be omitted.

[0052] 2. Assembly of the lower and upper components

[0053] The lower part 10 and the upper part 20 are fixed to the other side, that is, the opposite side of the blade, by means of rivets or welding.

[0054] 3. Grinding the blade ( Figure 3 Part A)

[0055] With the lower part 10 and the upper part 20 brought close together on one side (the part that will form the blade), the lower blade 11 and the upper blade 21 are formed by grinding together using the grinding wheel 200.

[0056] 4. Elastic deformation of the upper component ( Figure 3 Part B)

[0057] This ensures that the upper blade 21 remains in an open state relative to the lower blade 11, resulting in permanent deformation.

[0058] 5. Assembly of pins and pressure plates.

[0059] Finally, the pin 30 is made to pass through the pin through hole 22 of the lower part 10 and the upper part 20, so that the upper end of the pin 30 protrudes to the upper part of the upper part 20. In this case, the upper part 20 is in a state of being pressed towards the lower part 10 and has the elasticity to return to the initial position.

[0060] The locking rod 42 of the pressure plate 40 is engaged with the pressure plate assembly groove 31 at the upper end of the pin 30.

[0061] After assembling the upper component 20 and the lower component 10 using the aforementioned manufacturing process, with the cutting edges in a closed state, the upper cutting edge 21 and the lower cutting edge 11 are ground together. The lower component 10, manufactured using the MIM process, remains unchanged as a non-elastic body, while the upper component 20, as an elastic body, opens, resulting in plastic deformation. This is done so that the upper cutting edge 21 and the lower cutting edge 11 can always be in an open state before pressing the upper component 20 with the pressure plate 40. Among the two cutting edges (upper cutting edge 21 and lower cutting edge 11) at the same distance, if the upper cutting edge 21, after plastic deformation, wants to return to its original position, it will bend due to bending resistance, causing its length to shorten slightly. Therefore, when the pressure plate 40 is used to press the upper part 20 to trim the nails, as the nails are cut, the upper blade 21 of the elastic upper part 20 will not collide with the tip of the lower blade 11 of the non-elastic lower part 10, but will instead be inserted obliquely into the inside of the lower blade 11 of the non-elastic lower part 10, thereby avoiding direct collision with the lower blade 11 and ensuring the durability of the upper blade 21 and the lower blade 11.

[0062] Through the aforementioned manufacturing process, a product is manufactured as follows: Figure 1 The nail clippers 100 are shown in the image.

[0063] The method of using the nail clippers of the present invention, which consist of upper and lower blades with different physical properties, is the same as that of existing known methods, but the durability is better than that of nail clippers manufactured solely by the MIM process, thus allowing for long-term use.

Claims

1. A nail clipper composed of an upper blade and a lower blade with different physical properties, characterized in that, include: The upper and lower components extend along the length direction, each having an opposing upper and lower cutting edge formed at one end, while being fixed to each other on the other side; and The pressure plate, by pressing the upper component, causes the upper blade to close towards the lower blade. The lower component is inelastic and will not displace or deform, while the upper component is elastic and will deform elastically when the pressure plate is pressed.

2. The nail clippers according to claim 1, consisting of an upper blade and a lower blade with different physical properties, are characterized in that... The lower component is manufactured by metal injection molding, and the upper component is manufactured by stamping, so that the physical properties of the upper and lower blades are different.

3. The nail clippers according to claim 1 or 2, comprising an upper blade and a lower blade with different physical properties, characterized in that, When the upper component is pressed by the pressure plate, the upper blade undergoes elastic deformation to insert obliquely into the inside of the lower blade.

4. The nail clippers according to claim 3, comprising an upper blade and a lower blade with different physical properties, are characterized in that... The upper and lower components are manufactured separately. The upper and lower components are placed one on top of the other, so that their front ends are close together and their rear ends are joined together. The front ends of the upper and lower components are ground to form the upper and lower blades. The lower component is kept unchanged. The upper component is permanently deformed and bent to maintain an open state. While maintaining its elasticity, it is pressed back down towards the lower component. The pin and pressure plate are then assembled to manufacture the nail clippers.

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