Portable hand sawing tools, processing methods and usage instructions

Abstract

This invention discloses a portable hand sawing tool, its processing method, and its usage method. The saw teeth are composed of multiple toothed components. Each toothed component includes a base and a tooth tip. The base has opposing first and second planes. The front portion of the first plane is punched and thinned to form a third plane, constituting a first thinned portion, the thickness of which is slightly less than half the thickness of the toothed component. A chamfered chain axle hole is punched in this portion. The rear portion of the second plane is punched and thinned to form a fourth plane, constituting a second thinned portion. A cylindrical boss is formed in the middle of the fourth plane as a chain axle. During assembly, the chain axle of the preceding toothed component is inserted into the chain axle hole of the following toothed component and then riveted, causing the cylindrical boss to bevel and fill the chamfered portion of the chain axle hole to form a hinge. The total thickness after assembly is no greater than the base thickness of the toothed component. This design makes the tool labor-saving, highly efficient in sawing, and provides good flexibility and durability.

Description

Technical Field

[0001] This invention relates to a sawing tool, and more particularly to a portable hand sawing tool assembled from a single toothed blade for cutting small, thin or hollow materials. Background Technology

[0002] Hand chain saws are generally used for cutting branches, wood strips, etc.

[0003] A prismatic saw chain (CN221583898U) includes a drive plate, a connecting plate, and a cutting saw blade. The drive plate cooperates with a drive component to drive the saw chain. The connecting plate is disposed between adjacent drive plates and hinged to the drive plates via cylindrical pins. The cutting saw blade is disposed on either the drive plate or the connecting plate and contains prismatic teeth. A base may be disposed below the teeth, and the base is connected to the drive or connecting position.

[0004] The hand saw chain of CN214772615U includes a drive toothed gear group, a left toothed gear group, and a right toothed gear group. The left toothed gear group and the right toothed gear group are connected to both sides of the drive toothed gear group by a chain shaft. The drive toothed gear group is composed of multiple drive teeth connected in sequence, and the drive toothed gear group is provided with forward drive teeth and reverse drive teeth arranged at intervals.

[0005] Currently, most hand-operated chain saws on the market consist of two to three stacked pieces, resulting in a large kerf area and a wide distance between the saw teeth, making them unsuitable 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 hand sawing tool that is labor-saving and has high sawing efficiency, and is assembled from a single toothed blade.

[0007] The core technical concept of this solution lies in optimizing the structural design and assembly process of the toothed blade component to create a portable hand sawing tool assembled from a single toothed blade. This tool is not only labor-saving and highly efficient in sawing, but also possesses good flexibility and durability. Through techniques such as stamping thinning, hinge assembly, and an anti-reverse limiting structure, the tool's performance and user experience are significantly improved.

[0008] The technical solution of this invention to solve the above-mentioned technical problems is: a portable hand sawing tool assembled from a single toothed blade.

[0009] The saw tooth portion of the hand sawing tool is composed of multiple toothed blade components with continuous front and rear hinges. Each toothed blade component includes a base and a tooth tip. The base includes a first plane and a second plane with opposite sides. The front portion of the first plane is punched and thinned to form a third plane. The area between the first plane and the third plane is a first thinned portion. The thickness of the first thinned portion is slightly less than half the thickness of the toothed blade component. A chain shaft hole is punched out in the first thinned portion. The edge of the chain shaft hole has a chamfer.

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

[0011] When the preceding toothed plate component is hinged to the following toothed plate component, the chain shaft of the preceding toothed plate component is inserted into the chain shaft hole of the following toothed plate component and then riveted to make the cylindrical boss flange fill the chamfer of the chain shaft hole to form a hinge, and the total thickness of the two toothed plate components after assembly is not greater than the base thickness of the toothed plate component.

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

[0013] A further preferred embodiment of the present invention is: the saw teeth include bent tooth tips, and the tooth tips are formed by bending from the upper end of the base to one side;

[0014] Furthermore, each group of three saw teeth is divided into a left-bending tooth tip, a central tooth tip, and a right-bending tooth tip, or each group of three saw teeth is divided into a left-bending tooth tip, a right-bending tooth tip, and a central tooth tip; the arrangement order of each group of teeth in a saw chain is selected in one of these arrangements to maintain consistency; and the maximum distance between the tooth tips on two different sides is approximately 1.8-2 times the base thickness of the saw teeth.

[0015] A further preferred embodiment of the present invention is as follows: 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, the back of the first thinning part has a limiting surface A, and the limiting surface A and the limiting surface B constitute an anti-reverse limiting device.

[0016] Another preferred subject: a method for manufacturing a portable hand saw tool assembled from a single toothed blade, the method comprising the following steps:

[0017] (1): Provide a toothed component, wherein the thickness of the toothed component is set between 0.9mm and 1.5mm;

[0018] (2): The toothed component is subjected to stamping and thinning treatment, so that the two planes of the toothed material are partially thinned by stamping. The thickness after thinning is slightly less than half of the material thickness. One side is thinned and a chain shaft hole is punched out. The edge of the hole has a chamfer. The other side is thinned and a cylindrical boss is formed in the middle to serve as a chain shaft.

[0019] (3): After inserting the cylindrical boss of one toothed plate into the chain shaft hole of another toothed plate, the cylindrical boss is riveted to fill the chamfer of the chain shaft hole to form a hinge, and the total thickness of the two toothed plates after assembly is not greater than the thickness of the toothed plate material.

[0020] A further preferred embodiment of the present invention is that the distance between the center of the cylindrical boss of the toothed component and the center of the chain shaft hole is set between 5.8mm and 6.8mm.

[0021] A further preferred embodiment of the present invention is that the tooth tip bending of the toothed component is achieved by assembling planar toothed pieces into strips and then bending them into shape.

[0022] A further preferred embodiment of the present invention is that the shape of the toothed plate and the shape of the stamping thinning part are designed to have an anti-reverse function.

[0023] A further preferred embodiment of the present invention is as follows: the front part of the first plane is thinned by stamping to form a third plane, and the space between the first plane and the third plane is a first thinned portion; the thickness of the first thinned portion is slightly less than half the thickness of the toothed component; the rear part of the second plane is thinned by stamping to form a fourth plane, and the space between the second plane and the fourth plane is a second thinned portion.

[0024] Another preferred subject: a method of using a portable hand saw tool assembled from a single toothed blade, the method comprising the following steps:

[0025] Provided the portable hand saw tool;

[0026] Orient the teeth of the hand saw tool toward the object being sawed;

[0027] When an external force is applied, the hand sawing tool performs a sawing action. Because the toothed blade of the hand sawing tool has an anti-reverse structure, the tooth tips will automatically face the object being sawed, avoiding the trouble of adjusting the tooth direction before use.

[0028] Compared with existing technologies, the advantages of this invention are: the portable hand sawing tool of this invention significantly improves the labor-saving effect during sawing through a unique toothed blade component design. The base of the toothed blade component includes opposing first and second planes, wherein the front portion of the first plane is stamped and thinned to form a third plane, and the rear portion of the second plane is stamped and thinned to form a fourth plane. This stamping and thinning design not only reduces the weight of the toothed blade component but also optimizes the structural strength of the toothed blade by forming the first and second thinned portions. The cylindrical boss formed between the chain shaft hole punched in the first thinned portion and the fourth plane makes the hinge between the toothed blade components more flexible. This technique not only reduces the resistance during sawing but also makes the tool lighter and more convenient to use, thereby significantly reducing the user's labor intensity and achieving the goal of labor saving.

[0029] The sawing tool's serrated section consists of multiple continuously hinged toothed blade components, a technique that enables highly efficient cutting during the sawing process. The engagement of the chain shaft holes and cylindrical bosses in the toothed blade components, achieved through riveting, allows the cylindrical bosses to be flush with the chamfered edges of the chain shaft holes, forming a hinge that ensures stable connection and flexible rotation between the toothed blade components. This hinge structure not only improves sawing efficiency but also allows the tool to adapt to various shapes and sizes of objects being sawed, especially small, thin, or hollow materials. A small sawing bending radius (approximately 9mm) further enhances the tool's flexibility, enabling precise cutting even on materials with complex shapes, thus improving sawing efficiency and the tool's versatility.

[0030] Furthermore, through precise stamping thinning and hinge assembly processes, the portable hand sawing tool of this invention not only achieves labor-saving and efficient sawing but also ensures the tool's durability and reliability. The thickness of the toothed component is set between 0.9mm and 1.5mm, a thickness range that ensures sufficient strength while minimizing the tool's weight. In addition, the chamfered design of the chain shaft hole and the flanged treatment of the cylindrical boss during assembly not only improve assembly stability but also reduce wear and stress concentration during use. Attached Figure Description

[0031] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be construed as limiting the scope of the invention. Furthermore, unless specifically indicated, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated depictions, and the drawings are not necessarily drawn to scale.

[0032] Figure 1 A diagram of a toothed chain for a portable hand saw. Figure 1 ;

[0033] Figure 2 A diagram of a toothed chain for a portable hand saw. Figure 2 ;

[0034] Figure 3 A schematic diagram of the bent toothed chain of a portable hand saw.

[0035] Figure 4 A schematic diagram showing the assembly of the toothed blade components of a portable hand saw.

[0036] Figure 5 A schematic diagram of the toothed blade component of a portable hand saw. Figure 1 ;

[0037] Figure 6 A schematic diagram of the toothed blade component of a portable hand saw. Figure 2 ;

[0038] Figure 7 A schematic diagram of the toothed blade component of a portable hand saw. Figure 3 ;

[0039] Figure 8 A cross-sectional view of the toothed blade component of a portable hand saw;

[0040] Figure 9 Left view of the toothed blade component of a portable hand saw. Detailed Implementation

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

[0042] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it will not be further defined and explained in subsequent figures.

[0043] like Figures 1 to 3 As shown, a portable hand sawing tool 100 assembled from a single toothed blade has its saw teeth formed by multiple toothed blade components 10 continuously hinged front and rear, creating a flexible and efficient sawing chain. Figures 4 to 9 As shown, each toothed component 10 consists of a base 11 and a tooth tip 12. The base 11 has a first plane 01 and a second plane 02. The front portion of the first plane 01 is thinned by a stamping process to form a third plane 03, and the transition area between the first plane 01 and the third plane 03 constitutes the first thinned portion a1.

[0044] This unique stamping thinning technique not only reduces the overall weight of the toothed component 10 but also provides a crucial structural foundation for subsequent hinge assembly. The thickness of the first thinned portion a1 is carefully controlled to be slightly less than half the thickness of the toothed component 10, ensuring sufficient strength while minimizing material usage. A chain shaft hole 13 is also punched in the first thinned portion a1 for hinge connection with other toothed components 10. To facilitate assembly and improve connection stability, the chain shaft hole 13 is specially designed with a chamfered V along its edge.

[0045] The rear portion of the second plane 02 of the toothed component 10 is also thinned by stamping, forming the fourth plane 04. This process not only reduces the overall weight of the toothed component 10 but also provides a crucial structural foundation for subsequent hinge assembly. The transition area between the second plane 02 and the fourth plane 04 constitutes the second thinned portion a2. Similarly, this unique stamping thinning technique allows the toothed component 10 to maintain sufficient strength while minimizing material usage and improving tool portability. A cylindrical boss b is formed in the middle of the fourth plane 04 through stamping. This boss b will serve as the chain shaft 14 for hinge connection with other toothed components 10.

[0046] When the toothed blade components 10 are hinged together, the chain shaft 14 of the preceding toothed blade component 10 is inserted into the chain shaft hole 13 of the following toothed blade component 10. Subsequently, the cylindrical boss b is deformed by riveting, causing it to fill the chamfered v of the chain shaft hole 13. This process not only ensures a stable connection between the toothed blade components 10, but also forms a flexible hinge structure, allowing the sawing tool to bend and rotate flexibly during use.

[0047] Furthermore, this technique ensures that the total thickness of the two toothed blade components 10 after assembly does not exceed the base thickness of the toothed blade component 10. This not only avoids problems such as increased sawing resistance and higher processing accuracy requirements caused by increased thickness, but also improves sawing efficiency and the overall performance of the tool, making the portable hand sawing tool 100 more efficient and convenient in actual use.

[0048] Preferably, in this embodiment, to further optimize the performance of the portable hand sawing tool 100, the dimensional parameters of the toothed 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 precisely set within the range of 5.8 mm to 6.8 mm. Simultaneously, the base thickness of the toothed component 10 is also carefully considered, preferably set between 0.9 mm and 1.5 mm. This dimensional parameter configuration allows the hand sawing tool 100 to have a sawing bending radius of approximately 9 mm, such as... Figure 3 As shown.

[0049] This technique has significant advantages. First, the smaller sawing bending radius allows the sawing tool to adapt more flexibly to objects of various shapes and sizes during the sawing process, especially for small, thin, or hollow materials, enabling more precise and efficient sawing operations.

[0050] Secondly, when the sawing radius is approximately 9mm, the resulting curved arc m can easily wrap around objects with smaller diameters. This means that the tool is not only suitable for materials of standard size, but also performs exceptionally well when handling small or slender objects, greatly expanding its application scenarios and scope of use. Through this optimized technical solution, the portable hand sawing tool 100 maintains high-efficiency sawing performance while also possessing greater flexibility and adaptability, meeting the diverse needs of users in different scenarios.

[0051] Preferably, such as Figure 2 As shown, the serration 10 includes a bent tooth tip 12, which is formed by bending from the upper end of the base 11 to one side; and every three serrations 10 are divided into a left-bending tooth tip 12a, a central tooth tip 12b, and a right-bending tooth tip 12c.

[0052] Alternatively, the serrations can be grouped into sets of three: a left-bending tooth tip 12, a right-bending tooth tip 12, and a central tooth tip 12. Of course, other more flexible combinations are also possible.

[0053] In practical applications, it is preferable to select one particular arrangement for the teeth of each group of a saw chain to maintain consistency. This ensures that the cutting path of the entire saw chain is uniform and continuous.

[0054] Meanwhile, the maximum distance between the tips 11 on the two different sides is carefully designed to be approximately 1.8-2 times the thickness of the base 11 of the saw tooth 10. This technique not only ensures complete cutting along the cutting path and avoids gaps during sawing, but also provides ample space for sawdust discharge, thereby effectively reducing sawing resistance and significantly improving sawing efficiency.

[0055] Preferably, such as Figure 4 , Figure 5 , Figure 6As shown, the cylindrical boss b has a limiting part c on its back. The limiting part c is formed by the height difference between the second plane 02 and the fourth plane 04. The limiting part c has a limiting surface B, and the back of the first thinning part a1 has a limiting surface A. The limiting surfaces A and B constitute an anti-reverse limiting mechanism. With this technology, the cooperation of the limiting surfaces A and B allows the toothed component 10 to automatically orient itself during assembly and use. Specifically, when the toothed component 10 is hinged, the limiting surfaces A and B interact to ensure that the tooth tip 12 always faces the object being cut. Users do not need to manually adjust the tooth direction; the tool automatically ensures the correct tooth tip orientation during use, improving the tool's usability and ease of operation.

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

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

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

[0059] Preferably, both the limiting surface B and the limiting surface A of the saw teeth (i.e., the toothed component 10) are C-shaped arc surfaces, and both sides of the limiting surface B extend outwards to allow the saw teeth corresponding to the limiting surface A to rotate and move relative to each other within a certain range. The outer ends of the limiting surfaces A and B are both limiting segments. After adjacent saw teeth are hinged, the corresponding limiting segments of the limiting surfaces A and B cooperate with each other to limit the rotation and range of motion of the saw teeth.

[0060] This embodiment provides a method for manufacturing a portable hand sawing tool assembled from a single toothed blade. This method ensures the tool's high efficiency and reliability through precise process steps.

[0061] First, toothed components with a thickness between 0.9mm and 1.5mm are provided, a thickness range that balances strength, durability, lightness, and flexibility.

[0062] Next, the toothed component is thinned by stamping, so that the two planes are partially thinned by stamping, and the thickness after thinning is slightly less than half of the material thickness. One side is thinned and a chain shaft hole with a chamfer is punched out, while the other side is thinned to form a cylindrical boss as the chain shaft.

[0063] Then, the cylindrical boss of one toothed plate is inserted into the chain shaft hole of another toothed plate and riveted, so that the boss flange fills the chamfer of the chain shaft hole, forming a stable hinge structure. The total thickness after assembly is no greater than the thickness of the toothed plate material, avoiding the problems of increased sawing resistance and higher processing precision requirements. Furthermore, the distance between the center of the cylindrical boss of the toothed plate component and the center of the chain shaft hole is precisely set between 5.8mm and 6.8mm, giving the tool a very small sawing bending radius of approximately 9mm, greatly improving flexibility and adaptability when sawing small, thin, or hollow materials. The tooth tip bending method uses flat toothed plates assembled into strips before bending, reducing the use of forming molds, simplifying the production process, improving production efficiency, and reducing production costs.

[0064] Meanwhile, this invention also provides a method for using a portable hand saw, which optimizes the operation steps to ensure the tool's high efficiency and convenience. In use, the tips of the teeth of the hand saw are oriented towards the object being sawed, and then external force is applied to perform the sawing action. Because the toothed component 10 has an anti-reverse structure, the tooth tips 12 automatically face the object being sawed, avoiding the hassle of adjusting the tooth direction before use. This improves the tool's ease of use and operational convenience, reduces user errors and labor intensity, and makes the sawing process smoother and more efficient. Through the above manufacturing and usage methods, this portable hand saw not only achieves high efficiency, flexibility, and reliability in its design, but also provides great convenience and efficiency in practical use, especially suitable for cutting small, thin, or hollow materials, meeting the needs of various application scenarios.

[0065] In the description of this invention, it should be noted that the terms "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention. Similarly, "first" and "second" are only for ease of understanding and have no other directional meaning, and should not be considered as limitations on this invention.

[0066] This invention describes a portable hand sawing tool assembled from a single toothed blade, its processing method, and its usage. Specific examples are used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the invention and its core ideas. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A portable hand sawing tool assembled from a single toothed blade, characterized in that: The saw tooth portion of the hand sawing tool is composed of multiple toothed blade components that are continuously hinged front and rear. Each toothed blade component includes a base and a bent tooth tip. The base includes a first plane and a second plane that are opposite each other. The front part of the first plane is punched and thinned to form a third plane. The area between the second plane and the third plane is a first thinned portion. The thickness of the first thinned portion is slightly less than half the thickness of the toothed blade component. A chain shaft hole is punched out in the first thinned portion. The edge of the chain shaft hole has a chamfer. The rear part of the second plane is thinned by stamping to form the fourth plane. The second thinning part is between the first plane and the fourth plane, and a cylindrical boss is formed in the middle of the fourth plane as a chain shaft. When the first toothed plate component is hinged to the second toothed plate component, the chain shaft of the first toothed plate component is inserted into the chain shaft hole of the second toothed plate component and then riveted to make the cylindrical boss flange fill the chamfer of the chain shaft hole to form a hinge, and the total thickness of the two toothed plate components after assembly is not greater than the base thickness of the toothed plate component. The distance between the center of the cylindrical boss of the toothed component and the center of the chain shaft hole is set between 5.8mm and 6.8mm, and the base thickness of the toothed component is set between 0.9mm and 1.5mm, so that the hand sawing tool has a sawing bending radius of 9mm. The tooth tip is formed by bending the upper end of the base to one side; Furthermore, each group of three saw teeth is divided into a left-bending tooth tip, a central tooth tip, and a right-bending tooth tip, or each group of three saw teeth is divided into a left-bending tooth tip, a right-bending tooth tip, and a central tooth tip; the arrangement order of each group of teeth in a saw chain is selected in one of these arrangements to maintain consistency; and the maximum distance between the tooth tips on two different sides is 1.8-2 times the base thickness of the saw teeth; The cylindrical boss has a limiting part on its back; 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, the back of the first thinning part has a limiting surface A, and the limiting surface A and the limiting surface B constitute a structure with anti-reverse limiting function.

2. A method for manufacturing a portable hand sawing tool assembled from a single toothed blade according to claim 1, characterized in that: The method includes the following steps: (1): Provide a toothed component, wherein the thickness of the toothed component is set between 0.9mm and 1.5mm; (2): The toothed component is subjected to stamping and thinning treatment, so that the two planes of the toothed component are partially stamped and thinned, and the thickness after thinning is slightly less than half the thickness of the toothed component. One side is thinned and a chain shaft hole is punched out, and the edge of the hole is chamfered. The other side is thinned and a cylindrical boss is formed in the middle to serve as a chain shaft. (3): After inserting the cylindrical boss of one toothed component into the chain shaft hole of another toothed component, the cylindrical boss is riveted to fill the chamfer of the chain shaft hole to form a hinge, and the total thickness of the two toothed components after assembly is not greater than the thickness of the toothed component. The distance between the center of the cylindrical boss of the toothed component and the center of the chain shaft hole is set between 5.8mm and 6.8mm. The tooth tip bending of the toothed component is achieved by assembling the planar toothed components into strips and then bending them into shape. The shape of the toothed component and the shape of the stamping and thinning part are designed to have an anti-reverse limiting function. The front portion of the first plane is thinned by stamping to form the third plane, and the area between the second plane and the third plane is the first thinned portion; the thickness of the first thinned portion is slightly less than half the thickness of the toothed component; The rear portion of the second plane is thinned by stamping to form the fourth plane, and the area between the first plane and the fourth plane is the second thinned portion.

3. A method of using a portable hand sawing tool assembled from a single toothed blade, characterized in that: The method includes the following steps: Provided a portable hand sawing tool assembled from a single toothed blade as described in claim 1; Orient the teeth of the hand saw tool toward the object being sawed; When an external force is applied to make the hand sawing tool perform a sawing action, the toothed part of the hand sawing tool has a structure with an anti-reverse limiting function, and the tooth tip will automatically face the object being sawed, avoiding the trouble of adjusting the tooth direction before use.

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