Tool accessory mounting assembly and power tool

Abstract

The present application belongs to the technical field of electric tools, and particularly relates to a tool accessory clamping assembly and an electric tool. The tool accessory clamping assembly comprises a reciprocating rod, a quick-change sleeve, a lock pin, a limiting piece and a first elastic piece. The reciprocating rod is provided with a mounting groove along the axial direction of the reciprocating rod and an insertion hole along the radial direction of the reciprocating rod, the insertion hole is communicated with the mounting groove, and the mounting groove is used for inserting a tool accessory. The quick-change sleeve is sleeved on the reciprocating rod, the two ends of the quick-change sleeve are a small-diameter end and a large-diameter end respectively, and the inner diameter of the quick-change sleeve gradually increases from the small-diameter end to the large-diameter end. The lock pin is arranged in the insertion hole, the bottom of the lock pin abuts against the inner wall of the quick-change sleeve, and the top of the lock pin is used for inserting the tool accessory. The limiting piece is connected to the reciprocating rod and located on one side of the small-diameter end of the lock pin. The first elastic piece is located between the limiting piece and the quick-change sleeve, and the two ends of the first elastic piece abut against the limiting piece and the small-diameter end of the quick-change sleeve respectively. The tool accessory clamping assembly has the advantages of simple structure and convenient quick assembly and disassembly.

Description

Technical Field

[0001] This invention belongs to the field of power tool technology, specifically relating to a tool accessory clamping assembly and a power tool. Background Technology

[0002] In the field of power tools, especially reciprocating saws, saw blades are consumable accessories that require frequent replacement. To achieve quick installation and removal of saw blades, existing technologies generally use clamping assemblies for tool accessories to lock and release the saw blade. Currently, most mainstream clamping solutions on the market use a torsion spring-driven locking structure. This type of structure uses the torsional elastic force of the torsion spring to drive the locking element, thereby pressing and fixing the saw blade into the mounting groove of the reciprocating rod. However, long-term practical application has revealed that this type of clamping assembly based on torsion springs has many insurmountable technical defects.

[0003] Firstly, regarding structural weight, the torsion spring-loaded locking structure requires a torsion spring, multi-stage transmission components, and a complex retainer, resulting in a large number of parts, most of which are made of metal, significantly increasing the overall weight of the clamping assembly. For handheld reciprocating saws, overall weight is a key indicator of operational comfort. As a component located at the front of the tool, the increased weight of the clamping assembly not only directly increases the overall machine weight but also alters the center of gravity distribution, shifting it forward. This exacerbates wrist fatigue during prolonged use, severely impacting the tool's ergonomics and user experience. Secondly, regarding structural complexity and manufacturing cost, the existing chuck outer ring (i.e., the external sleeve driven by the operator's press) typically requires multiple stepped surfaces, limiting grooves, and mating curved surfaces to accommodate the torsion spring's installation space and force transmission path, resulting in a complex geometry. Due to the molding requirements of such complex irregular structures, this outer ring part can generally only be mass-produced using Metal Injection Molding (MIM) technology. While MIM technology can form complex shapes, its high mold costs, long sintering cycle, and numerous post-processing steps result in a significantly higher cost per unit than traditional machined or stamped parts. This, in turn, increases the material and manufacturing costs of the entire clamping assembly, which is detrimental to the product's market competitiveness.

[0004] Therefore, there is an urgent need to provide a tool accessory clamping assembly and power tool that is simple in structure, easy to manufacture, and easy to assemble and disassemble quickly to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a tool accessory clamping assembly that is simple in structure, easy to manufacture, and convenient for quick assembly and disassembly. This purpose is achieved through the following technical solution: A first aspect of the present invention provides a tool accessory clamping assembly, comprising: A tool accessory clamping assembly, characterized in that it comprises: A reciprocating rod has a mounting groove along its axial direction and a insertion hole along its radial direction. The insertion hole communicates with the mounting groove, and the mounting groove is used to insert tool accessories. A quick-change sleeve is fitted onto the reciprocating rod. The quick-change sleeve has a small diameter end and a large diameter end at its two ends, and the inner diameter of the quick-change sleeve gradually increases from the small diameter end to the large diameter end. A locking pin passes through the insertion hole, the bottom of the locking pin abuts against the inner wall of the quick-change sleeve, and the top of the locking pin is used to insert with the tool accessory; A limiting member is connected to the reciprocating rod and located on one side of the small diameter end of the locking pin; A first elastic element is located between the limiting element and the quick-change sleeve, and its two ends abut against the small diameter ends of the limiting element and the quick-change sleeve, respectively.

[0006] The working principle of the tool accessory clamping assembly in this technical solution is as follows: In the initial locked state, the first elastic element is in a naturally elongated or slightly compressed state. Its elastic force pushes the quick-change sleeve towards the large-diameter end, and the small-diameter end of the quick-change sleeve tends to approach the locking pin. Therefore, the inner wall of the quick-change sleeve radially presses the locking pin inward, causing the top of the locking pin to pass through the insertion hole and extend into the mounting groove, and then be inserted into the mounting hole of the tool accessory (such as a saw blade), thus achieving locking. When the operator needs to change the tool accessory, they press the quick-change sleeve by hand, causing it to overcome the elastic force of the first elastic element and slide axially towards the limiting element. At this time, the position of the bottom of the locking pin relative to the inner wall of the quick-change sleeve gradually moves from the small-diameter end to the large-diameter end. Because the inner diameter of the large-diameter end is larger, the radial constraint force on the locking pin is reduced, and the locking pin can be withdrawn radially outward. After the top of the locking pin disengages from the limiting hole of the tool accessory, the operator can pull the tool accessory out of the mounting groove, completing the disassembly. When assembling a new tool accessory, the operator holds down the quick-change sleeve, inserts the tool accessory into the mounting slot, and then releases the quick-change sleeve. The first elastic element releases its elastic potential energy, pushing the quick-change sleeve to slide back towards the direction away from the limiting element. During the reset process, the guide surface on the inner wall pushes the bottom of the locking pin, causing the locking pin to move radially inward, and the top of the locking pin gradually inserts into the mounting hole of the tool accessory. When the quick-change sleeve is fully reset, the locking pin is reliably locked in the insertion position, completing the tool accessory assembly.

[0007] Clearly, the tool accessory clamping assembly in this technical solution only requires five core components—a reciprocating rod, a quick-change sleeve, a locking pin, a limiting component, and a first elastic component—to achieve the locking and releasing functions of the tool accessory. It eliminates the need for complex torsion spring retainers, multi-stage transmission components, and irregularly shaped chuck outer rings, simplifying the assembly process and improving production efficiency and product yield. By eliminating the bulky torsion spring and complex metal transmission components, the overall weight of this embodiment is significantly reduced. In the prior art, the complex chuck outer ring requires metal injection molding, which is costly. In contrast, the quick-change sleeve in this embodiment is a simple variable-diameter sleeve structure, which can be manufactured using conventional machining, stamping, or injection molding processes. It offers a wide range of material choices (metal or engineering plastics), significantly reducing parts manufacturing costs and mold investment. Furthermore, the operator only needs to press the quick-change sleeve with one hand to compress the first elastic element. The quick-change sleeve slides towards the limiting element, allowing the locking pin to exit the mounting slot and enabling quick removal of tools and accessories. After releasing the quick-change sleeve, the first elastic element returns to its elastic deformation, pushing the quick-change sleeve back to its original position. Guided by the inner wall of the quick-change sleeve, the locking pin automatically inserts into the tool and accessory limiting hole, completing the locking process. The entire assembly and disassembly process requires no additional tools, achieving true one-click quick-change.

[0008] In addition, the tool accessory clamping assembly of the present invention may also have the following additional technical features: In some embodiments of the present invention, the locking pin includes a rod portion and an abutment portion connected together, the diameter of the rod portion being smaller than the diameter of the abutment portion to form a limiting surface at the top of the abutment portion, a stepped portion being provided in the insertion hole, and the tool accessory clamping assembly further includes a second elastic member sleeved on the rod portion, the two ends of the second elastic member abutting against the stepped portion and the limiting surface, respectively.

[0009] In some embodiments of the present invention, both the first elastic element and the second elastic element are compression springs, and the stiffness coefficient of the first elastic element is greater than that of the second elastic element.

[0010] In some embodiments of the present invention, the locking pin further includes a head, which is connected to the rod portion, and the diameter of the head is smaller than the diameter of the rod portion. The outer periphery of the head is perpendicular to the top surface of the rod portion. The head is used to insert the tool accessory, and the top surface of the rod portion is used to abut against the tool accessory.

[0011] In some embodiments of the present invention, the bottom of the locking pin is a spherical surface, and the spherical surface makes rolling contact with the inner wall of the quick-change sleeve.

[0012] In some embodiments of the present invention, the reciprocating rod is provided with an annular groove, and the limiting member is sleeved in the annular groove.

[0013] In some embodiments of the present invention, the limiting member includes a retaining ring and a washer arranged side by side, the washer abutting against the first elastic member.

[0014] In some embodiments of the present invention, a protective sleeve is provided between the reciprocating rod and the quick-change sleeve, and the protective sleeve has a through hole for the locking pin to pass through, and the through hole is connected to the insertion hole.

[0015] In some embodiments of the present invention, the sheath is provided with a first connecting hole extending radially therefrom, and the reciprocating rod is provided with a second connecting hole extending radially therefrom, the first connecting hole and the second connecting hole communicating with each other, and the first connecting hole and the second connecting hole being connected by a pin.

[0016] In a second aspect of the invention, a power tool is provided, which includes the tool attachment and the tool attachment clamping assembly described in the above embodiments. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of the assembly of a tool accessory clamping assembly according to an embodiment of the present invention is shown. Figure 2 A schematic cross-sectional view of a tool accessory clamping assembly according to an embodiment of the present invention is shown. Figure 3 A schematic cross-sectional view of the assembly structure of the tool accessory clamping assembly and the saw blade according to an embodiment of the present invention is shown. Figure 4 A schematic diagram of the assembly structure of the reciprocating rod and the sheath according to an embodiment of the present invention is shown. Figure 5 A schematic diagram of the locking pin according to an embodiment of the present invention is shown.

[0018] The labels in the attached diagram are as follows: 10. Tools and accessories; 100. Reciprocating rod; 110. Mounting groove; 120. Insertion hole; 130. Stepped section; 140. Annular groove; 150. Second connecting hole; 200. Quick-change sleeve; 210. Annular rib; 300, Locking pin; 310, Rod part; 320, Abutting part; 321, Limiting surface; 330, Head; 400. Limiting component; 410. Retaining ring; 420. Washer; 500. First elastic element; 600. Second elastic element; 700, Sheath; 710, Through hole; 720, First connecting hole; 800, pin. Detailed Implementation

[0019] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0020] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also include the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0021] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0022] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0023] Figure 1 A schematic diagram of the assembly of a tool accessory clamping assembly according to an embodiment of the present invention is shown. Figure 2 A schematic cross-sectional view of a tool accessory clamping assembly according to an embodiment of the present invention is shown. Figure 3 A schematic cross-sectional view of the assembly structure of the tool accessory clamping assembly and the saw blade according to an embodiment of the present invention is shown. Figure 4 A schematic diagram illustrating the assembly structure of the reciprocating rod 100 and the sheath 700 according to an embodiment of the present invention is shown. Figures 1 to 4 As shown, this invention proposes a tool accessory clamping assembly, including a reciprocating rod 100, a quick-change sleeve 200, a locking pin 300, a limiting member 400, and a first elastic member 500; the reciprocating rod 100 has a mounting groove 110 along its axial direction and a insertion hole 120 along its radial direction, the insertion hole 120 communicating with the mounting groove 110, the mounting groove 110 being used to insert the tool accessory 10; the quick-change sleeve 200 is sleeved on the reciprocating rod 100, the two ends of the quick-change sleeve 200 being small diameter... The inner diameter of the quick-change sleeve 200 gradually increases from the small diameter end to the large diameter end; the locking pin 300 passes through the insertion hole 120, the bottom of the locking pin 300 abuts against the inner wall of the quick-change sleeve 200, and the top of the locking pin 300 is used to insert with the tool accessory 10; the limiting member 400 is connected to the reciprocating rod 100 and is located on one side of the small diameter end of the locking pin 300; the first elastic member 500 is located between the limiting member 400 and the quick-change sleeve 200, and its two ends abut against the small diameter ends of the limiting member 400 and the quick-change sleeve 200, respectively.

[0024] The working principle of the tool accessory clamping assembly in this technical solution is as follows: In the initial locked state, the first elastic element 500 is in a naturally extended or slightly compressed state. Its elastic force pushes the quick-change sleeve 200 towards the large-diameter end. The small-diameter end of the quick-change sleeve 200 tends to approach the locking pin 300. Thus, the inner wall of the quick-change sleeve 200 radially presses the locking pin 300 inward, causing the top of the locking pin 300 to pass through the insertion hole 120 and extend into the mounting groove 110, and then be inserted into the mounting hole of the tool accessory 10 (such as a saw blade), thereby achieving locking. When the operator needs to change the tool accessory 10, he presses the quick-change sleeve 200 by hand, causing the quick-change sleeve 200 to overcome the elastic force of the first elastic element 500 and slide axially towards the limiting element 400. At this time, the position of the bottom of the locking pin 300 relative to the inner wall of the quick-change sleeve 200 gradually moves from the small-diameter end to the large-diameter end. Because the inner diameter of the larger end is larger, the radial constraint force on the locking pin 300 is reduced, allowing the locking pin 300 to retract radially outward. After the top of the locking pin 300 disengages from the limiting hole of the tool accessory 10, the operator can pull the tool accessory 10 out of the mounting slot 110, completing the disassembly. When assembling a new tool accessory 10, the operator keeps pressing the quick-change sleeve 200, inserts the tool accessory 10 into the mounting slot 110, and then releases the quick-change sleeve 200. The first elastic element 500 releases its elastic potential energy, pushing the quick-change sleeve 200 to slide back towards the direction away from the limiting element 400. During the reset process, the guide surface of the inner wall pushes the bottom of the locking pin 300, causing the locking pin 300 to move radially inward, and the top of the locking pin 300 gradually inserts into the mounting hole of the tool accessory 10. When the quick-change sleeve 200 is fully reset, the locking pin 300 is reliably locked in the insertion position, completing the assembly of the tool accessory 10.

[0025] Clearly, the tool accessory clamping assembly in this technical solution only requires five core components—the reciprocating rod 100, the quick-change sleeve 200, the locking pin 300, the limiting component 400, and the first elastic component 500—to achieve the locking and releasing functions of the tool accessory 10. It eliminates the need for complex torsion spring retainers, multi-stage transmission components, and irregularly shaped chuck outer rings, simplifying the assembly process and improving production efficiency and product yield. By eliminating the bulky torsion springs and complex metal transmission components, the overall weight of this embodiment is significantly reduced. In the prior art, the complex chuck outer ring requires metal injection molding, which is costly. In contrast, the quick-change sleeve 200 in this embodiment is a simple variable-diameter sleeve structure, which can be manufactured using conventional machining, stamping, or injection molding processes. It offers a wide range of material choices (metal or engineering plastics), significantly reducing parts manufacturing costs and mold investment. Furthermore, the operator only needs to press the quick-change sleeve 200 with one hand to compress the first elastic element 500. The quick-change sleeve 200 slides towards the limiting element 400, allowing the locking pin 300 to exit the mounting slot 110, thus enabling the quick removal of the tool accessory 10. After releasing the quick-change sleeve 200, the first elastic element 500 returns to its elastic deformation, pushing the quick-change sleeve 200 back to its original position. Guided by the inner wall of the quick-change sleeve 200, the locking pin 300 automatically inserts into the limiting hole of the tool accessory 10, completing the locking process. The entire assembly and disassembly process requires no additional tools, achieving true one-click quick-change.

[0026] Optionally, an annular rib 210 is provided at one end of the quick-change sleeve 200 near the first elastic member 500. The annular rib 210 widens the contact surface between the quick-change sleeve 200 and the first elastic member 500, ensuring the contact stability between the quick-change sleeve 200 and the first elastic member 500.

[0027] Furthermore, the locking pin 300 includes a rod portion 310 and an abutment portion 320 connected to each other. The diameter of the rod portion 310 is smaller than the diameter of the abutment portion 320, so that a limiting surface 321 is formed on the top of the abutment portion 320. A step portion 130 is provided in the insertion hole 120. The tool accessory clamping assembly also includes a second elastic member 600 sleeved on the rod portion 310. The two ends of the second elastic member 600 abut against the step portion 130 and the limiting surface 321, respectively.

[0028] Understandably, the limiting surface 321 formed by the rod portion 310 of the locking pin 300 and the abutment portion 320, in conjunction with the step portion 130 within the insertion hole 120, provides a stable installation space and limiting support for the second elastic element 600. This precisely limits the axial position of the second elastic element 600, preventing it from shifting or deviating during operation. It ensures that the direction of the elastic force is always radially along the locking pin 300, improving the consistency of the component's movement. By setting the second elastic element 600, the locking pin 300 can automatically move away from the mounting groove 110 in the unlocked state. Specifically, when the operator presses the quick-change sleeve 200 to unlock, the inner wall of the quick-change sleeve 200 releases the radial constraint on the bottom of the locking pin 300. At this time, the second elastic element 600, relying on its own elastic force, pushes the locking pin 300 radially outward, causing the top of the locking pin 300 to actively exit the mounting groove 110 area. This provides sufficient space for the insertion of the tool accessory 10, preventing the locking pin 300 from interfering with the insertion path of the tool accessory 10, making the assembly and disassembly operations smoother. Meanwhile, the second elastic element 600 makes the reset action of the locking pin 300 more sensitive and reliable. When the quick-change sleeve 200 resets, the locking pin 300 moves radially inward under the push of the inner wall of the quick-change sleeve 200. At the same time, the second elastic element 600 is compressed and stores force. During this process, the second elastic element 600 provides a stable reaction force, ensuring that the bottom of the locking pin 300 always keeps in close contact with the inner wall of the quick-change sleeve 200, eliminating gaps and impacts between the locking pin 300 and the quick-change sleeve 200, and avoiding jamming or abnormal noise problems caused by gaps. In addition, the second elastic element 600 also plays a role in buffering and vibration reduction. When the tool is performing cutting operations, the alternating load on the tool accessory 10 is transmitted to the inside of the component through the locking pin 300. The second elastic element 600 can absorb some of the vibration energy, reduce the rigid impact between the locking pin 300 and the quick-change sleeve 200, reduce noise, improve operating comfort, and extend the fatigue life of the components. Optionally, in this embodiment, the rod portion 310 and the abutment portion 320 are integrally formed structures. In other embodiments, the rod portion 310 and the abutment portion 320 may be separate structures and connected by threaded connection or interference fit.

[0029] Furthermore, both the first elastic element 500 and the second elastic element 600 are compression springs, and the stiffness coefficient of the first elastic element 500 is greater than that of the second elastic element 600.

[0030] Understandably, the stiffness coefficient of the first elastic element 500 is greater than that of the second elastic element 600, ensuring that the locking pin 300 is subjected to a compressive force towards the mounting groove 110 under any working condition. Specifically, the restoring force applied by the first elastic element 500 to the quick-change sleeve 200 is converted into a radial pressing force on the locking pin 300 through the inner wall of the quick-change sleeve 200, while the second elastic element 600 applies a radial retraction force to the locking pin 300. Because the first elastic element 500 has greater stiffness, the pressing force it generates is always greater than the retraction force of the second elastic element 600, thereby ensuring that the top of the locking pin 300 is always inserted into the mounting hole of the tool accessory 10, eliminating the shaking caused by the gap, and effectively ensuring the fixation reliability of the tool accessory 10 under heavy-duty cutting conditions. For example, the first elastic element 500 and the second elastic element 600 can be made of spring steel wire of different materials. For example, the first elastic element 500 uses high-strength piano wire to provide greater elastic force and longer fatigue life; the second elastic element 600 uses stainless steel wire to balance elasticity and corrosion resistance.

[0031] Furthermore, Figure 5 A schematic diagram of the locking pin 300 according to an embodiment of the present invention is shown. See also Figures 3 to 5 The locking pin 300 also includes a head 330, which is connected to the rod 310. The diameter of the head 330 is smaller than that of the rod 310. The outer periphery of the head 330 is perpendicular to the top surface of the rod 310. The head 330 is used to insert the tool accessory 10, and the top surface of the rod 310 is used to abut against the tool accessory 10.

[0032] The design of the head 330 having a smaller diameter than the rod 310 allows the head 330 to be inserted into the tool attachment 10, while the top surface of the rod 310 (i.e., the stepped surface at the connection between the head 330 and the rod 310) abuts against the surface of the tool attachment 10, achieving a double limiting effect. Furthermore, unlike the prior art that uses a conical locking pin 300, in this embodiment, the outer periphery of the head 330 is a vertical surface. When the tool attachment 10 is subjected to a large load, the force exerted by the wall of the limiting hole on the head 330 is perpendicular to this vertical surface (i.e., horizontally). This force has no axial component, therefore it does not generate a pushing force that pushes the locking pin 300 outward. This fundamentally eliminates the risk of the locking pin 300 retracting due to the conical component force, significantly improving the safety of heavy-duty cutting operations. Optionally, a guide chamfer or a rounded chamfer can be provided at the top of the head 330. The guide chamfer acts as a guide when the head 330 is inserted into the limiting hole of the tool accessory 10. Even if there is a slight deviation between the limiting hole and the head 330 during initial alignment, the head 330 can smoothly slide into the limiting hole under the guidance of the chamfer, reducing the requirements for assembly precision and improving the fault tolerance of clamping. Optionally, the head 330 and the rod 310 can be integrally formed. Optionally, a wear-resistant hardened layer can be provided on the outer peripheral surface of the head 330.

[0033] Furthermore, the bottom of the locking pin 300 is spherical, and the spherical surface makes rolling contact with the inner wall of the quick-change sleeve 200.

[0034] The spherical bottom and the inner wall of the quick-change sleeve 200 are in rolling contact rather than sliding contact, significantly reducing the frictional resistance between them. During the reciprocating sliding of the quick-change sleeve 200, the bottom of the locking pin 300 moves along the inner wall of the quick-change sleeve 200. The spherical contact results in a small contact area and a low coefficient of friction, greatly reducing the force required for the operator to press the quick-change sleeve 200, making operation easier and less strenuous, especially suitable for work scenarios that require frequent changes of tool accessories 10. In addition, the spherical contact makes the locking pin 300 more flexible during radial movement. Since the spherical surface and the inner wall are in point contact, the locking pin 300 can freely rotate a small angle when pushed by the inner wall of the quick-change sleeve 200, automatically adapting to the guide surface of the inner wall, avoiding jamming caused by angle deviation, and making the extension and retraction of the locking pin 300 smoother and more reliable. Optionally, a wear-resistant pad or wear-resistant coating can be provided on the inner wall of the quick-change sleeve 200 in the area corresponding to the movement trajectory of the bottom of the locking pin 300.

[0035] Further, see Figure 4 The reciprocating rod 100 is provided with an annular groove 140, and the limiting member 400 is sleeved in the annular groove 140.

[0036] The structure of mounting the limiting member 400 using the annular groove 140 is simple and reliable. The limiting member 400 is sleeved in the annular groove 140. Through the axial limiting effect of the annular groove 140, the limiting member 400 is precisely fixed at the predetermined axial position of the reciprocating rod 100, and will not move axially under the action of spring force, thus providing a stable support reference surface for the first elastic member 500.

[0037] Furthermore, the limiting member 400 includes a retaining ring 410 and a washer 420 arranged side by side, with the washer 420 abutting against the first elastic member 500.

[0038] The limiting component 400 is composed of a retaining ring 410 and a washer 420 arranged side by side. The retaining ring 410 performs the main axial limiting function, while the washer 420 directly abuts against the first elastic element 500. Their functions are clearly defined. The washer 420 provides a flat and smooth supporting end face for the first elastic element 500, avoiding localized stress concentration and wear that may occur when the end of the first elastic element 500 directly contacts the retaining ring 410. This helps protect the spring end and extends the spring's lifespan. The washer 420 increases the contact area with the first elastic element 500, allowing the elastic force of the first elastic element 500 to be evenly transmitted to the limiting component 400. This prevents the quick-change sleeve 200 from skewing or jamming during sliding due to uneven force distribution, improving the linearity and smoothness of the quick-change sleeve 200's movement. Optionally, the retaining ring 410 is an elastic retaining ring 410, which can be radially expanded for easy assembly and disassembly. Preferably, the washer 420 can be made of a wear-resistant material, and it is in long-term contact with the end of the first elastic element 500. Even if slight wear occurs, only the washer 420 needs to be replaced, without replacing the retaining ring 410 which is fixedly connected to the reciprocating rod 100, thus reducing maintenance costs and repair difficulty. For example, the washer 420 can be injection molded from polyoxymethylene or polyamide material.

[0039] Further, see also Figure 4 A protective sleeve 700 is provided between the reciprocating rod 100 and the quick-change sleeve 200. The protective sleeve 700 has a through hole 710 for the locking pin 300 to pass through, and the through hole 710 is connected to the insertion hole 120.

[0040] The sheath 700, acting as an intermediate isolation layer, separates the quick-change sleeve 200 from the reciprocating rod 100, preventing direct contact between the quick-change sleeve 200 and the reciprocating rod 100 during sliding. This prevents metal-to-metal friction and wear, extending the service life of both the reciprocating rod 100 and the quick-change sleeve 200. Simultaneously, the sheath 700 eliminates the need for the inner wall of the quick-change sleeve 200 to directly mate with the outer wall of the reciprocating rod 100, reducing the surface precision requirements for both. The sheath 700 also serves a dustproof and protective function, filling the radial gap between the reciprocating rod 100 and the quick-change sleeve 200. This prevents external dust and debris from entering the assembly, protecting core components such as the first elastic element 500, the second elastic element 600, and the locking pin 300 from contamination and improving the assembly's reliability in harsh environments. Figure 3 As shown, without the tool accessory 10 installed, the bottom of the locking pin 300 protrudes from the surface of the sheath 700, and the inner diameter of the small diameter end of the quick-change sleeve 200 fits with the outer diameter of the sheath 700. Therefore, even under the thrust of the first elastic element 500, the quick-change sleeve 200 will not come off the sheath 700.

[0041] Furthermore, the sheath 700 is provided with a first connecting hole 720 extending radially therefrom, and the reciprocating rod 100 is provided with a second connecting hole 150 extending radially therefrom. The first connecting hole 720 and the second connecting hole 150 communicate with each other and are connected by a pin 800.

[0042] The sheath 700 and the reciprocating rod 100 are fixed by a pin 800 connection. This structure is simple and reliable. The pin 800 passes through both the first connecting hole 720 and the second connecting hole 150, locking them simultaneously in the radial and axial directions. This ensures that the sheath 700 will not move axially or rotate circumferentially relative to the reciprocating rod 100, guaranteeing precise alignment between the through hole 710 and the insertion hole 120. The pin 800 connection is a detachable connection method. When the sheath 700 needs replacement due to wear from long-term use, simply remove the pin 800 to remove the old sheath 700 and install the new one. Maintenance is simple and quick, eliminating the need to replace the reciprocating rod 100 and reducing maintenance costs. Preferably, the top of the pin 800 protrudes from the surface of the sheath 700, thus providing axial restraint for the quick-change sleeve 200 and preventing it from detaching from the sheath 700 when the tool accessory 10 is not inserted. Optionally, the top of the pin 800 is spherical to reduce friction with the quick-change sleeve 200. Optionally, the diameter of the first connecting hole 720 is larger than the diameter of the second connecting hole 150, and the pin 800 is stepped.

[0043] In summary, the working principle of the tool accessory clamping assembly in this technical solution is as follows: In the locked state, the head 330 of the locking pin 300 is inserted into the mounting hole of the tool accessory 10. The first elastic element 500 is in a naturally extended or slightly compressed state, and its elastic force pushes the quick-change sleeve 200 towards the large-diameter end. The small-diameter end of the quick-change sleeve 200 tends to approach the locking pin 300, thereby the inner wall of the quick-change sleeve 200 radially presses the locking pin 300 inward, so that the top of the locking pin 300 passes through the insertion hole 120 and extends into the mounting groove 110, and then is inserted into the mounting hole of the tool accessory 10, thereby achieving locking. At the same time, the second elastic element 600 is in a compressed state, storing elastic potential energy, and pushes the bottom of the locking pin 300 to press against the inner wall of the quick-change sleeve 200. However, since the stiffness coefficient of the first elastic element 500 is greater than that of the second elastic element 600, the top of the locking pin 300 is always inserted into the mounting hole of the tool accessory 10.

[0044] When the operator presses the quick-change sleeve 200 to slide it toward the limiting member 400, the radial pressure of the inner wall of the quick-change sleeve 200 on the abutment portion 320 decreases or even disappears. At this time, the second elastic member 600 releases its elastic potential energy, pushing the limiting surface 321 of the locking pin 300, causing the locking pin 300 to move radially outward as a whole. The rod portion 310 and the abutment portion 320 move outward synchronously, and the top of the locking pin 300 exits the mounting groove 110, thus unlocking the device. At this time, the tool accessory 10 can be removed from the mounting groove 110.

[0045] When installing a new tool accessory 10, press the quick-change sleeve 200 to slide it towards the limiting member 400 and insert the new tool accessory 10. Then, release the quick-change sleeve 200. At this time, the first elastic member 500 pushes the quick-change sleeve 200 to reset, the abutment portion 320 is pushed radially inward by the inner wall of the quick-change sleeve 200, and the locking pin 300 moves inward as a whole, so that the head 330 of the locking pin 300 is inserted into the mounting hole of the tool accessory 10. Simultaneously, the second elastic member 600 is compressed and stores force. After the quick-change sleeve 200 resets, the second elastic member 600 remains in a compressed state, and its elastic force always points radially outward. However, because the constraint force of the small-diameter end of the quick-change sleeve 200 on the abutment portion 320 is greater than the elastic force of the second elastic member 600, the locking pin 300 remains locked.

[0046] This technical solution also provides a power tool, a tool accessory, and the aforementioned tool accessory clamping assembly. Exemplarily, the tool accessory is a saw blade. The power tool also includes a housing and a drive mechanism. The tool accessory clamping assembly is disposed at the front end of the housing. The drive mechanism is connected to the reciprocating rod 100. The saw blade is inserted into the mounting slot 110, and the top of the locking pin 300 is inserted into the saw blade.

[0047] This power tool replaces the traditional torsion spring structure with an axially arranged spring-storage structure, significantly simplifying the structure, reducing weight, and lowering costs while ensuring quick assembly and disassembly. A force-matching design with dual springs, where the stiffness of the first elastic element (500) is greater than that of the second (600), ensures stable clamping of the saw blade under all working conditions. The 300 right-angle stepped design of the locking pin fundamentally solves the safety hazard of the saw blade easily falling off under heavy loads. This power tool boasts outstanding advantages such as simple structure, light weight, low cost, convenient operation, and high safety and reliability, and has excellent prospects for widespread application.

[0048] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A tool accessory clamping assembly, characterized in that, include: A reciprocating rod (100) has a mounting groove (110) along its axial direction and a insertion hole (120) along its radial direction. The insertion hole (120) communicates with the mounting groove (110), and the mounting groove (110) is used to insert a tool accessory (10). Quick-change sleeve (200), the quick-change sleeve (200) is sleeved on the reciprocating rod (100), the two ends of the quick-change sleeve (200) are a small diameter end and a large diameter end respectively, and the inner diameter of the quick-change sleeve (200) gradually increases from the small diameter end to the large diameter end; Locking pin (300), the locking pin (300) passes through the insertion hole (120), the bottom of the locking pin (300) abuts against the inner wall of the quick-change sleeve (200), and the top of the locking pin (300) is used to insert with the tool accessory (10); A limiting member (400) is connected to the reciprocating rod (100) and located on one side of the small diameter end of the locking pin (300); The first elastic element (500) is located between the limiting element (400) and the quick-change sleeve (200), and its two ends abut against the small diameter ends of the limiting element (400) and the quick-change sleeve (200), respectively.

2. The tool accessory clamping assembly according to claim 1, characterized in that, The locking pin (300) includes a rod portion (310) and an abutment portion (320) connected to each other. The diameter of the rod portion (310) is smaller than the diameter of the abutment portion (320) to form a limiting surface (321) on the top of the abutment portion (320). A step portion (130) is provided in the insertion hole (120). The tool accessory clamping assembly also includes a second elastic member (600) sleeved on the rod portion (310). The two ends of the second elastic member (600) abut against the step portion (130) and the limiting surface (321) respectively.

3. The tool accessory clamping assembly according to claim 2, characterized in that, Both the first elastic element (500) and the second elastic element (600) are compression springs, and the stiffness coefficient of the first elastic element (500) is greater than that of the second elastic element (600).

4. The tool accessory clamping assembly according to claim 2, characterized in that, The locking pin (300) also includes a head (330), which is connected to the rod (310), and the diameter of the head (330) is smaller than the diameter of the rod (310). The outer periphery of the head (330) is perpendicular to the top surface of the rod (310). The head (330) is used to insert into the tool attachment (10), and the top surface of the rod (310) is used to abut against the tool attachment (10).

5. The tool accessory clamping assembly according to claim 1, characterized in that, The bottom of the locking pin (300) is spherical, and the spherical surface makes rolling contact with the inner wall of the quick-change sleeve (200).

6. The tool accessory clamping assembly according to claim 1, characterized in that, The reciprocating rod (100) is provided with an annular groove (140), and the limiting member (400) is sleeved in the annular groove (140).

7. The tool accessory clamping assembly according to claim 1, characterized in that, The limiting member (400) includes a retaining ring (410) and a washer (420) arranged side by side, and the washer (420) abuts against the first elastic member (500).

8. The tool accessory clamping assembly according to any one of claims 1-7, characterized in that, A protective sleeve (700) is provided between the reciprocating rod (100) and the quick-change sleeve (200). The protective sleeve (700) has a through hole (710) for the locking pin (300) to pass through, and the through hole (710) is connected to the insertion hole (120).

9. The tool accessory clamping assembly according to claim 8, characterized in that, The sheath (700) is provided with a first connecting hole (720) extending radially therefrom, and the reciprocating rod (100) is provided with a second connecting hole (150) extending radially therefrom. The first connecting hole (720) communicates with the second connecting hole (150), and the first connecting hole (720) and the second connecting hole (150) are connected by a pin (800).

10. A power tool, characterized in that, Includes the tool accessory and the tool accessory clamping assembly as claimed in any one of claims 1 to 9.

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