Portable manual sawing tool, machining method and using method

Abstract

The invention discloses a portable manual sawing tool, a machining method and a using method, a sawtooth part of the portable manual sawing tool is composed of a plurality of tooth piece components, each tooth piece component comprises a base part and a tooth tip, the base part is provided with a first plane and a second plane which are opposite, the front part of the first plane is punched and thinned to form a third plane to form a first thinned part, and the second plane is punched and thinned to form a second thinned part; the thickness of the second plane is slightly smaller than half of the thickness of the tooth piece component, a chain shaft hole with a chamfer is punched in the second plane, the rear part of the second plane is punched and thinned to form a fourth plane to form a second thinned part, and a cylindrical boss is formed in the middle of the fourth plane to serve as a chain shaft; during assembly, the chain shaft of the previous tooth piece component is inserted into the chain shaft hole of the next tooth piece component and then riveted, so that the cylindrical boss turnup is filled into the chamfer of the chain shaft hole to form a hinge, and the total thickness after assembly is not greater than the thickness of the base part of the tooth piece component. Due to the design, the tool is labor-saving, high in sawing efficiency and good in flexibility and durability.

Description

Technical Field

[0001] The invention relates to a sawing tool, in particular to a portable manual sawing tool composed of a single tooth piece, which is used for cutting small, thin or hollow materials. Background Art

[0002] Hand saw chains are generally used for cutting branches, wood strips, etc.

[0003] CN221583898U discloses a prismatic sawtooth chain comprising a transmission plate, a connecting plate, and a cutting saw blade. The transmission plate cooperates with a driving component to drive the saw chain. The connecting plate is disposed between adjacent transmission plates and is hinged to the transmission plates via a cylindrical pin. The cutting saw blade is disposed on the transmission plate or the connecting plate and comprises prismatic teeth. A base may be provided below the teeth, connected to a transmission position or a connecting position.

[0004] CN214772615U's hand-pulled hand saw chain comprises a transmission tooth plate group, a left tooth plate group and a right tooth plate group, wherein the left tooth plate group and the right tooth plate group are connected to both sides of the transmission tooth plate group via a chain shaft; the transmission tooth plate group is formed by sequentially connecting a plurality of transmission tooth plates, and the transmission tooth plate group is provided with forward transmission saw teeth and reverse transmission saw teeth arranged at intervals.

[0005] The hand saw chains currently on the market are made up of two to three stacked pieces, with a large sawing area and a large distance between the cutting teeth, which is not convenient for cutting small, hollow or thin materials. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a portable manual sawing tool which is assembled from a single tooth piece and has high sawing efficiency and saves labor.

[0007] The core technical concept of this solution lies in optimizing the structural design and assembly process of the tooth components to create a portable manual sawing tool composed of a single tooth. This tool not only saves effort and improves sawing efficiency, but also provides excellent flexibility and durability. The technical means of stamping thinning, hinge assembly, and anti-reverse limit structure significantly improve the tool's performance and user experience.

[0008] The technical solution of the present invention to solve the above technical problems is: a portable manual sawing tool assembled from a single tooth piece,

[0009] The sawtooth part of the manual sawing tool is composed of a plurality of serrated blade components hinged successively before and after. The serrated blade component includes a base and a tooth tip. The base includes opposite first and second planes. The front part of the first plane is thinned by stamping to form a third plane. Between the first plane and the third plane is a first thinning part. The thickness of the first thinning part is slightly less than half of the thickness of the serrated blade component. A chain shaft hole is punched out in the first thinning part, and the edge of the chain shaft hole has a chamfer.

[0010] The rear part of the second plane is thinned by stamping to form a fourth plane. Between the second plane and the fourth plane is a second thinning part, and a cylindrical boss is formed in the middle of the fourth plane as a chain shaft.

[0011] When the previous serrated blade component is hinged to the next one, the chain shaft of the previous serrated blade component is inserted into the chain shaft hole of the next serrated blade component and then riveted and pressed so that the cylindrical boss is flanged and filled into the chamfer of the chain shaft hole to form a hinge, and the total thickness after the assembly of the two serrated blade components is not greater than the thickness of the base of the serrated blade component.

[0012] A further preferred technical solution of the present invention is that the distance between the center of the cylindrical boss and the center of the chain shaft hole of the serrated blade component is set between 5.8 mm and 6.8 mm, and the thickness of the base of the serrated blade component is set between 0.9 mm and 1.5 mm, so that the manual sawing tool has a sawing bending radius of about 9 mm.

[0013] A further preferred technical solution of the present invention is that the sawtooth includes a bent tooth tip, and the tooth tip is bent from the upper end of the base to one side.

[0014] And every three sawteeth are grouped into a left-bent tooth tip, a centered tooth tip, and a right-bent tooth tip, or every three sawteeth are grouped into a left-bent tooth tip, a right-bent tooth tip, and a centered tooth tip; the arrangement order of each group of teeth of a saw chain selects one of the arrangement methods to maintain consistency; and the maximum distance between the tooth tips on two different sides is about 1.8 - 2 times the thickness of the base of the sawtooth.

[0015] A further preferred technical solution of the present invention is that a limiting part is provided on the back of the cylindrical boss; the limiting part is formed by the height difference between the second plane and the fourth plane. The limiting part has a limiting surface B, and the back of the first thinning part has a limiting surface A. The limiting surface A and the limiting surface B constitute anti-reversal limiting.

[0016] Another preferred subject: A manufacturing method of a portable manual sawing tool assembled from a single serrated blade, the method comprising the following steps:

[0017] (1): Provide a serrated blade component, and the thickness of the serrated blade component is set between 0.9 mm and 1.5 mm.

[0018] (2): Perform stamping and thinning treatment on the tooth piece component, so that parts of the two planes of the tooth piece material are stamped and thinned. The thinned thickness is slightly less than half of the material thickness. One side is thinned and a chain shaft hole is punched out, and the hole edge has a chamfer. While the other side is thinned, a cylindrical boss is formed in the middle for use as a chain shaft;

[0019] (3): Insert the cylindrical boss of one tooth piece into the chain shaft hole of another tooth piece and then rivet and press so that the cylindrical boss is flanged and filled into the chamfer of the chain shaft hole to form a hinge, and the total thickness of the two assembled tooth pieces is not greater than the thickness of the tooth piece material.

[0020] A further preferred technical solution of the present invention is that: the distance between the center of the cylindrical boss and the center of the chain shaft hole of the tooth piece component is set between 5.8 mm and 6.8 mm.

[0021] A further preferred technical solution of the present invention is that: the tooth tip bending of the tooth piece component adopts the method of assembling flat tooth pieces into a strip and then bending and forming.

[0022] A further preferred technical solution of the present invention is that: the shape of the outer shape of the tooth piece and the stamping and thinning part is designed into a structure with an anti-reverse function.

[0023] A further preferred technical solution of the present invention is that: the front part of the first plane is stamped and thinned to form a third plane, and the first thinning part is between the first plane and the third plane; the thickness of the first thinning part is slightly less than half of the thickness of the tooth piece component; the rear part of the second plane is stamped and thinned to form a fourth plane, and the second thinning part is between the second plane and the fourth plane.

[0024] Another preferred subject: A method of using a portable manual sawing tool assembled from a single tooth piece, the method comprising the following steps:

[0025] Provide the portable manual sawing tool;

[0026] Orient the tooth tip of the manual sawing tool towards the object to be sawn;

[0027] Apply an external force to make the manual sawing tool perform a sawing action. Since the tooth piece of the manual sawing tool has a structure with an anti-reverse function, the tooth tip will automatically face the object to be sawn, avoiding the trouble of having to adjust the tooth opening direction before use.

[0028] Compared with the prior art, the advantages of the present invention are as follows: Through the unique setting of the tooth blade component, the portable manual sawing tool of the present invention significantly improves the labor-saving effect during the sawing process. The base of the tooth blade component includes opposite first and second planes, wherein the front part of the first plane is thinned by stamping to form a third plane, and the rear part of the second plane is thinned by stamping to form a fourth plane. This stamping and thinning design not only reduces the weight of the tooth blade component, but also optimizes the structural strength of the tooth blade by forming a first thinning part and a second thinning part. The chain shaft hole punched out in the first thinning part and the cylindrical boss formed in the middle of the fourth plane make the hinge connection between the tooth blade components more flexible. This technical means not only reduces the resistance during sawing, but also makes the tool more portable during use, thereby significantly reducing the labor intensity of the user and achieving the goal of labor saving.

[0029] The sawtooth part of the sawing tool is composed of multiple tooth blade components hinged continuously front and back. This technical means enables the tool to achieve efficient cutting during the sawing process. The cooperation between the chain shaft hole and the cylindrical boss of the tooth blade component forms a hinge by riveting and pressing the cylindrical boss to turn over and fill the chamfer of the chain shaft hole, ensuring the stable connection and flexible rotation between the tooth blade components. This hinge structure not only improves the sawing efficiency, but also enables the tool to adapt to various shapes and sizes of objects to be sawn, especially small, thin or hollow materials. The smaller sawing bending radius (about 9 mm) further enhances the flexibility of the tool, enabling it to perform precise cutting on materials with complex shapes, thereby improving the sawing efficiency and the applicability of the tool.

[0030] In addition, through precise stamping and thinning treatment and hinge assembly process, the portable manual sawing tool of the present invention not only achieves labor saving and efficient sawing, but also ensures the durability and reliability of the tool. The thickness of the tooth blade component is set between 0.9 mm and 1.5 mm. This thickness range ensures sufficient strength while minimizing the weight of the tool. In addition, the chamfer design of the chain shaft hole and the flanging treatment of the cylindrical boss during assembly not only improve the assembly stability, but also reduce wear and stress concentration during use. Description of the Drawings

[0031] The present invention will be further described in detail below in conjunction with the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be used as a limitation to the scope of the present invention. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0032] Figure 1 Schematic diagram of the sawtooth chain of the portable manual sawing tool Figure 1 ;

[0033] Figure 2 Schematic diagram of the sawtooth chain of a portable hand sawing tool Figure 2 ;

[0034] Figure 3 Schematic diagram of the bent state of the sawtooth chain of a portable hand sawing tool;

[0035] Figure 4 Schematic diagram of the cooperation of the tooth blade components of a portable hand sawing tool;

[0036] Figure 5 Overall schematic diagram of the tooth blade components of a portable hand sawing tool Figure 1 ;

[0037] Figure 6 Overall schematic diagram of the tooth blade components of a portable hand sawing tool Figure 2 ;

[0038] Figure 7 Overall schematic diagram of the tooth blade components of a portable hand sawing tool Figure 3 ;

[0039] Figure 8 Cross-sectional view of the tooth blade components of a portable hand sawing tool;

[0040] Figure 9 Left view of the tooth blade components of a portable hand sawing tool. Detailed implementation manners

[0041] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary, and should not be construed as limiting the protection scope of the present invention.

[0042] It should be noted that: similar reference numerals represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it will not be further defined and explained in subsequent drawings.

[0043] As Figures 1 to 3 shown, a portable hand sawing tool 100 assembled from a single tooth blade, the sawtooth part of which is formed by a plurality of tooth blade components 10 hinged continuously front and back, forming a flexible and efficient sawing chain. As Figures 4 to 9 shown, each tooth blade component 10 is composed of a base portion 11 and a tooth tip 12. The base portion 11 has opposite first plane 01 and second plane 02. In the front part of the first plane 01, it is thinned by stamping process to form a third plane 03, and the transition area between the first plane 01 and the third plane 03 constitutes a first thinning portion a1.

[0044] This unique stamping thinning technique not only reduces the overall weight of the tooth piece component 10, but also provides a key structural foundation for subsequent hinge assembly. The thickness of the first thinning part a1 is carefully controlled to be slightly less than half of the thickness of the tooth piece component 10, ensuring that while maintaining sufficient strength, the material usage is minimized. On the first thinning part a1, a chain shaft hole 13 is punched for hinge connection with other tooth piece components 10. To facilitate assembly and improve the stability of the connection, a chamfer v is specially designed on the edge of the chain shaft hole 13.

[0045] In the rear part of the second plane 02 of the tooth piece component 10, the stamping thinning process is also adopted to form the fourth plane 04. This process not only reduces the overall weight of the tooth piece component 10, but also provides a key structural foundation for subsequent hinge assembly. The transition region between the second plane 02 and the fourth plane 04 constitutes the second thinning part a2. Similarly, this unique stamping thinning technique enables the tooth piece component 10 to minimize the material usage while maintaining sufficient strength, improving the portability of the tool. At the middle position of the fourth plane 04, a cylindrical boss b is formed by stamping process, and this boss b will be used as the chain shaft 14 for hinge connection with other tooth piece components 10.

[0046] When hinge connection is made between the tooth piece components 10, the chain shaft 14 of the previous tooth piece component 10 is inserted into the chain shaft hole 13 of the subsequent tooth piece component 10. Subsequently, through the riveting process, the cylindrical boss b is flanged and deformed so that it fills the chamfer v of the chain shaft hole 13. This process not only ensures the stable connection between the tooth piece components 10, but also forms a flexible hinge structure, enabling the sawing tool to bend and rotate flexibly during use.

[0047] In addition, this technical means also ensures that the total thickness after the assembly of the two tooth piece components 10 is not greater than the base thickness of the tooth piece component 10. Thus, not only problems such as increased sawing resistance and higher machining accuracy requirements caused by increased thickness are avoided, but also the sawing efficiency and the overall performance of the tool are improved, making the portable manual sawing tool 100 more efficient and convenient in actual use.

[0048] Preferably, in this embodiment, in order to further optimize the performance of the portable manual sawing tool 100, the dimensional parameters of the tooth piece component 10 are specifically set. Specifically, the distance between the center of the cylindrical boss b and the center of the chain shaft hole 13 is accurately set within the range of 5.8 mm to 6.8 mm. At the same time, the base thickness of the tooth piece component 10 is also carefully considered and preferably set between 0.9 mm and 1.5 mm. Such a configuration of dimensional parameters enables the manual sawing tool 100 to have a sawing bending radius of approximately 9 mm, as Figure 3 shown.

[0049] This technical means has significant technical advantages. First of all, the smaller sawing bending radius enables the sawing tool to more flexibly adapt to various shapes and sizes of objects to be sawn during the sawing process. Especially for small, thin or hollow materials, more precise and efficient sawing operations can be achieved.

[0050] Secondly, when the sawing bending radius is about 9 mm, the formed bending arc m can easily wrap around an object with a smaller diameter. This means that the tool is not only applicable to materials of conventional sizes, but also can perform excellently when dealing with small or slender objects, greatly expanding its application scenarios and scope of applicability. Through this optimized technical solution, the portable hand sawing tool 100 not only maintains high sawing performance, but also has higher flexibility and adaptability, meeting the diverse needs of users in different scenarios.

[0051] Preferably, as Figure 2 shown, the saw teeth 10 include bent tooth tips 12, and the tooth tips 12 are bent from the upper end of the base 11 to one side; and every three saw teeth 10 are grouped into tooth tips 12a bent to the left, tooth tips 12b in the middle, and tooth tips 12c bent to the right.

[0052] Or, every three saw teeth 10 are grouped into tooth tips 12 bent to the left, tooth tips 12 bent to the right, and tooth tips 12 in the middle. Of course, other more flexible combination methods can also be used.

[0053] In actual selection, it is preferable to choose one of the arrangement methods for the arrangement order of each group of saw teeth of a saw chain to maintain consistency. It ensures that the sawing path of the whole saw chain is uniform and continuous.

[0054] At the same time, the maximum distance between the tooth tips 11 on two different sides is carefully designed to be about 1.8 - 2 times the thickness of the base 11 of the saw teeth 10. This technical means can not only ensure complete cutting on the cutting path, avoid gaps during the sawing process, but also provide sufficient space for the discharge of sawdust, thereby effectively reducing the sawing resistance and significantly improving the sawing efficiency.

[0055] Preferably, as Figure 4 , Figure 5 , Figure 6As shown in the figure, a restricting portion c is provided on the back of the cylindrical boss b; the restricting portion c is formed by the height difference between the second plane 02 and the fourth plane 04, the restricting portion c has a restricting surface B, and the back of the first thinning portion a1 has a restricting surface A. The restricting surface A and the restricting surface B form an anti-reverse limit. Under this technical means, the restricting surface A and the restricting surface B cooperate to enable the tooth piece component 10 to be automatically oriented during assembly and use. Specifically, when the tooth piece component 10 is hinged, the restricting surface A and the restricting surface B interact to ensure that the tooth tip 12 always faces the object to be sawn. The user does not need to manually adjust the tooth opening direction, and the tool can automatically ensure that the tooth tip faces correctly during use, improving the usability and operation convenience of the tool.

[0056] The anti-reverse limit structure prevents the tooth piece component 10 from reversing during use through the interaction between the restricting surface A and the restricting surface B. Preventing misoperation not only improves the stability and safety of sawing, but also avoids the reduction of sawing efficiency and tool damage caused by the reversal of the tooth piece.

[0057] Moreover, since the tooth tip 12 can automatically face the object to be sawn, the tool direction does not need to be frequently adjusted during the sawing process, thereby reducing the sawing interruption and adjustment time.

[0058] That is, by providing a restricting portion c on the back of the cylindrical boss b and using the restricting surface A and the restricting surface B to form an anti-reverse limit structure, the portable manual sawing tool 100 realizes the automatic orientation function, prevents misoperation, improves the sawing efficiency, enhances the durability of the tool, and simplifies the user operation.

[0059] Preferably, both the restricting surface B and the restricting surface A of the saw teeth (that is, the tooth piece component 10) are C-shaped arc surfaces, and both sides of the restricting surface B are in an outward expanding shape to allow the saw teeth corresponding to the restricting surface A to rotate and move relative to each other within a certain range. The outer ends of the restricting surface A and the restricting surface B are both restricting segments. After adjacent saw teeth are hinged, the corresponding restricting segments of the restricting surface A and the restricting surface B cooperate to limit the rotation and movement amplitude of the saw teeth.

[0060] This embodiment provides a manufacturing method of a portable manual sawing tool assembled by a single tooth piece. This method ensures the high efficiency performance and reliability of the tool through precise process steps.

[0061] First, a tooth piece component with a thickness between 0.9 mm and 1.5 mm is provided. This thickness range takes into account strength, durability, lightness, and flexibility.

[0062] Next, the tooth piece component is subjected to stamping and thinning treatment, so that the local parts of the two planes are stamped and thinned, and the thinned thickness is slightly less than half of the material thickness. One side is thinned and a chain shaft hole with a chamfer is punched out, and a cylindrical boss is formed as the chain shaft while the other side is thinned.

[0063] Then, the cylindrical boss of one tooth piece is inserted into the chain shaft hole of another tooth piece and then riveted and pressed, so that the boss is flanged and filled into the chamfer of the chain shaft hole, forming a stable hinge structure, and the total thickness after assembly is not greater than the thickness of the tooth piece material, avoiding the problems of increased sawing resistance and higher machining accuracy requirements. In addition, the distance between the center of the cylindrical boss of the tooth piece component and the center of the chain shaft hole is precisely set between 5.8 mm and 6.8 mm, so that the tool has a minimum sawing bending radius of about 9 mm, greatly improving the flexibility and adaptability when sawing small, thin or hollow materials. The tooth tip bending adopts the method of bending and forming after the flat tooth pieces are assembled into strips, reducing the use of forming molds, simplifying the production process, improving the production efficiency and reducing the production cost.

[0064] Meanwhile, the present invention also provides a method for using a portable manual sawing tool, which ensures the efficient use and convenience of the tool by optimizing the operation steps. When in use, the tooth tip of the manual sawing tool is oriented towards the object to be sawn, and then an external force is applied to perform the sawing action. Since the tooth piece component 10 has a structure with anti-reverse function, the tooth tip 12 will automatically face the object to be sawn, avoiding the trouble of adjusting the tooth opening direction before use, improving the ease of use and operation convenience of the tool, reducing the operation errors and labor intensity of the user, and making the sawing process smoother and more efficient. Through the above manufacturing and using methods, this portable manual sawing tool not only achieves high-efficient, flexible and reliable performance in design, but also provides great convenience and high efficiency in actual use, and is especially suitable for cutting small, thin or hollow materials, meeting the requirements of various application scenarios.

[0065] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present invention is usually placed during use. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. The terms "first" and "second" are only for the convenience of description and have no other directional meanings, and should not be construed as a limitation to the present invention.

[0066] This paper introduces the portable hand sawing tool assembled from a single tooth blade, processing method and usage method provided by the present invention. Specific examples are used in this paper to elaborate on the principle and implementation mode of the present invention. The description of the above embodiments is only used to help understand the present invention and its core idea. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A portable manual sawing tool assembled from a single tooth blade, characterized in that: The serrated part of the manual sawing tool is composed of a plurality of tooth blade components hinged continuously front and back. The tooth blade component includes a base and a tooth tip. The base includes opposite first and second planes. The front part of the first plane is stamped and thinned to form a third plane. Between the first plane and the third plane is a first thinning part; the thickness of the first thinning part is slightly less than half of the thickness of the tooth blade component. A chain shaft hole is punched out in the first thinning part, and the edge of the chain shaft hole has a chamfer; The rear part of the second plane is stamped and thinned to form a fourth plane. Between the second plane and the fourth plane is a second thinning part, and a cylindrical boss is formed in the middle of the fourth plane as a chain shaft; When the previous tooth blade component is hinged to the next tooth blade component, the chain shaft of the previous tooth blade component is inserted into the chain shaft hole of the next tooth blade component and then riveted so that the cylindrical boss is flanged and filled into the chamfer of the chain shaft hole to form a hinge, and the total thickness after the assembly of the two tooth blade components is not greater than the thickness of the base of the tooth blade component.

2. The portable hand sawing tool assembled from a single tooth piece according to claim 1, characterized in that: The distance between the center of the cylindrical boss of the tooth blade component and the center of the chain shaft hole is set between 5.8 mm and 6.8 mm, and the thickness of the base of the tooth blade component is set between 0.9 mm and 1.5 mm, so that the manual sawing tool has a sawing bending radius of about 9 mm.

3. The portable manual sawing tool assembled from a single tooth blade according to claim 1, characterized in that: The serration includes a bent tooth tip, and the tooth tip is bent from the upper end of the base to one side; And every three serrations are grouped into a tooth tip bent to the left, a tooth tip in the middle, and a tooth tip bent to the right, or every three serrations are grouped into a tooth tip bent to the left, a tooth tip bent to the right, and a tooth tip in the middle; the arrangement order of each group of teeth of a saw chain selects one of the arrangement methods to maintain consistency; and the maximum distance between the tooth tips on two different sides is about 1.8 - 2 times the thickness of the base of the serration.

4. The portable manual sawing tool according to claim 1, characterized in that: A limiting part is provided on the back of the cylindrical boss; the limiting part is formed by the height difference between the second plane and the fourth plane. The limiting part has a limiting surface B, and the back of the first thinning part has a limiting surface A. The limiting surface A and the limiting surface B constitute an anti-reverse limit.

5. A manufacturing method of a portable hand sawing tool assembled from a single tooth piece, characterized in that: The method includes the following steps: (1): Provide tooth blade components, and the thickness of the tooth blade components is set between 0.9 mm and 1.5 mm; (2): Perform a stamping and thinning treatment on the tooth blade components, so that the local parts of the two planes of the tooth blade material are stamped and thinned. The thinned thickness is slightly less than half of the material thickness. One side is thinned and a chain shaft hole is punched out, and the edge of the hole has a chamfer. While the other side is thinned, a cylindrical boss is formed in the middle as a chain shaft; (3): Insert the cylindrical boss of one tooth blade into the chain shaft hole of another tooth blade and then rivet so that the cylindrical boss is flanged and filled into the chamfer of the chain shaft hole to form a hinge, and the total thickness after the assembly of the two tooth blades is not greater than the thickness of the tooth blade material.

6. The manufacturing method according to claim 5, characterized in that: The distance between the center of the cylindrical boss of the tooth blade component and the center of the chain shaft hole is set between 5.8 mm and 6.8 mm.

7. The manufacturing method according to claim 6, characterized in that: The tooth tip of the tooth piece component is bent by a method of assembling flat tooth pieces into a strip and then bending and forming.

8. The manufacturing method according to claim 6, characterized in that: The outer shape of the tooth piece and the shape of the stamping and thinning part are designed into a structure with an anti-reverse function.

9. The manufacturing method according to claim 6, characterized in that: The front part of the first plane is stamped and thinned to form a third plane, and the first thinning part is between the first plane and the third plane; the thickness of the first thinning part is slightly less than half of the thickness of the tooth piece component. The rear part of the second plane is stamped and thinned to form a fourth plane, and the second thinning part is between the second plane and the fourth plane.

10. A method of using a portable manual sawing tool assembled from a single tooth blade, characterized in that: The method includes the following steps: Provide the portable manual sawing tool according to any one of claims 1-5. Orient the tooth tip of the manual sawing tool towards the object to be sawn. Apply an external force to make the manual sawing tool perform a sawing action. Since the tooth piece of the manual sawing tool has a structure with an anti-reverse function, the tooth tip will automatically face the object to be sawn, avoiding the trouble of having to adjust the tooth opening direction before use.

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