Tool accessory clamping assembly and electric tool

Abstract

The utility model belongs to the technical field of power tools, and particularly relates to a tool accessory clamping assembly and an electric tool. The tool accessory clamping assembly comprises a clamping head, a clamping sleeve, a lock sleeve and a torsional spring. The chuck is provided with an opening cavity; the top of the clamping sleeve is inserted into the open cavity, and the tool accessory can be vertically inserted into the clamping sleeve; the lock sleeve comprises a sleeve and a bottom plate, the sleeve is rotatably arranged on the chuck in a sleeving mode, an insertion opening is formed in the bottom plate, a locking ring is arranged on the bottom plate, the locking ring is arranged along the inner wall of the sleeve, and an accessory positioning boss is arranged on the inner ring of the locking ring; the torsional spring is arranged in the sleeve and arranged on the chuck in a sleeving mode, and the restoring force of the torsional spring can drive the lock sleeve to rotate anticlockwise. And after the lock sleeve rotates in place, the convex part of the tool accessory abuts against the accessory positioning boss, and the locking ring and the clamping sleeve are arranged in a sleeving manner and are in interference connection, so that the clamping sleeve clamps the tool accessory. By means of the tool accessory clamping assembly in the technical scheme, the tool accessories can be rapidly assembled and disassembled, and the tool accessories can be clamped by the clamping assembly.

Description

Technical Field

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

[0002] When cutting or sawing workpieces, power tools capable of reciprocating motion are often required. These tools typically have attachments such as saw blades or cutting tools. To ensure the saw blades or cutting tools can stably and efficiently cut or saw through the workpiece, the tool attachments need to be securely clamped onto a clamping assembly. Furthermore, when cutting materials such as wood or metal, tool attachments are prone to wear and tear, requiring frequent replacement. Therefore, the clamping assembly should allow for quick clamping and disassembly of tool attachments to ensure efficient cutting operations.

[0003] In the prior art, to achieve quick mounting of tool attachments, patent application number 200510050178.8 discloses a patent for a quick-release chuck for an electric jigsaw, including a clamping component, a locking sleeve, and a locking sleeve return torsion spring. The locking sleeve and clamping component are provided with matching return tightening threads. A compression spring is installed in the clamping component cavity, and a positioning pressure member is installed in front of the compression spring and slidably positioned in the clamping component cavity. The front end of the positioning pressure member has a saw blade end positioning groove. In practical applications, due to the diverse thicknesses of saw blades or blades, the clamping assembly should be able to adapt to various tool attachments. However, clamping assemblies like the one described above often experience unstable clamping when holding thinner tool attachments. The wobbling of the tool attachment during use leads to decreased cutting accuracy and may even affect the operation of the cutting cover.

[0004] Therefore, there is an urgent need to provide a tool accessory clamping assembly and a power tool to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a clamping assembly capable of quickly loading and unloading tool accessories and clamping the tool accessories. This purpose is achieved through the following technical solution:

[0006] The first aspect of this utility model provides a tool accessory clamping assembly, wherein the tool accessory is provided with a protrusion and a recess connected in sequence, and the tool accessory clamping assembly includes a chuck, a sleeve, a locking sleeve, and a torsion spring;

[0007] The chuck has an open mouth;

[0008] The top of the clip is inserted into the opening, and the clip has a slot through which the tool accessory can be vertically inserted into the clip.

[0009] The locking sleeve includes a sleeve and a base plate connected to the bottom of the sleeve. The sleeve is rotatably fitted onto the chuck. The base plate has an opening that allows the tool accessory to pass through. A locking ring is provided on the base plate. The locking ring is arranged along the inner circumference of the sleeve. An accessory positioning boss is provided on the inner ring of the locking ring.

[0010] The torsion spring is disposed inside the sleeve and sleeved on the chuck, and the restoring force of the torsion spring can drive the locking sleeve to rotate counterclockwise;

[0011] After the locking sleeve rotates into place, the protrusion of the tool accessory and the positioning boss of the accessory abut against each other, and the locking ring and the clamp are fitted and interference-fitted to clamp the tool accessory.

[0012] By applying the tool accessory clamping assembly provided in this technical solution, the operator first needs to insert the tool accessory sequentially into the socket on the locking sleeve and the slot on the clamping sleeve during the tool accessory installation process. Once the tool accessory is fully inserted, the torsion spring automatically drives the locking sleeve to rotate counterclockwise. This action causes the accessory positioning boss to rotate below the protrusion of the tool accessory. At this point, the accessory positioning boss and the protrusion of the tool accessory abut against each other, effectively preventing the tool accessory from detaching from the locking sleeve. Simultaneously, the locking ring applies circumferential pressure to the clamping sleeve, clamping the workpiece accessory securely. When it is necessary to remove the tool accessory, the operator simply rotates the locking sleeve clockwise until the socket aligns with the protrusion on the tool accessory, and then removes the tool accessory from the clamping assembly. In summary, this clamping assembly not only enables quick assembly and disassembly of tool accessories, but also ensures that the tool accessories do not wobble during operation after they are installed. The interference fit between the locking ring and the collet causes the collet to be squeezed by the locking ring, resulting in the slot shrinking and the collet tightly clamping the tool accessory. This ensures that the tool accessory does not wobble during operation, guaranteeing the stability and accuracy of the operation.

[0013] In addition, the tool accessory clamping assembly of this utility model may also have the following additional technical features:

[0014] In some embodiments of this utility model, the wall surface of the locking ring used for interference connection with the sleeve is the locking wall surface, and the distance from the locking wall surface to the central axis of the sleeve gradually decreases in the clockwise direction.

[0015] In some embodiments of this utility model, the inner wall of the locking ring is provided with a positioning shoulder, which is connected to the side of the locking wall that is closer to the central axis of the locking sleeve. The positioning shoulder is used to abut against the clamp to achieve circumferential positioning of the locking sleeve.

[0016] In some embodiments of this utility model, the tool accessory clamping assembly further includes a compression spring, which is disposed in the opening, with one end of the compression spring abutting against the top of the opening and the other end of the compression spring abutting against the clip.

[0017] In some embodiments of this utility model, the inner ring of the locking ring is provided with a sleeve positioning boss, the end face of the locking ring is higher than the end face of the sleeve positioning boss, the sleeve positioning boss and the accessory positioning boss are spaced apart to form a limiting groove, the central axis of the limiting groove is perpendicular to the central axis of the insertion port, when the sleeve positioning boss is facing the sleeve, the sleeve can abut against the sleeve positioning boss under the restoring force of the compression spring, and when the limiting groove is facing the sleeve, the sleeve can be inserted into the limiting groove under the restoring force of the compression spring.

[0018] In some embodiments of this utility model, the height of the sleeve positioning boss gradually decreases in the clockwise direction. When the locking sleeve rotates counterclockwise relative to the sleeve, the restoring force of the compression spring pushes the sleeve to move toward the sleeve positioning boss and abut against the sleeve positioning boss.

[0019] In some embodiments of this utility model, the insertion port includes a rectangular opening and fan-shaped openings respectively disposed on both sides of the rectangular opening. The fan-shaped openings and the rectangular opening are connected. The tool accessory is inserted into the insertion port through the rectangular opening. When the recess is facing the base plate, the torsion spring can drive the locking sleeve to rotate so that the recess is located in the fan-shaped opening.

[0020] In some embodiments of this utility model, the open end of the chuck is provided with an accessory clearance notch for engaging with the protrusion of the tool accessory. When the protrusion is inserted into the accessory clearance notch, the recess and the base plate are opposite each other.

[0021] In some embodiments of this utility model, the tool accessory clamping assembly further includes a retaining spring, the outer periphery of the chuck is provided with an annular rib, the annular rib is located inside the sleeve, the inner wall of the sleeve is provided with an annular groove, the retaining spring is engaged with the annular groove, the retaining spring and the side of the annular rib facing away from the opening end of the chuck abut against each other, and the torsion spring is located between the end face of the annular rib and the locking ring.

[0022] In a second aspect, this utility model provides an electric tool, which includes a drive unit, a tool accessory, and a tool accessory clamping assembly as described above. The tool accessory is inserted into the slot through the socket, and the drive unit is connected to the chuck for driving the chuck to reciprocate. Attached Figure Description

[0023] 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 scope of the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0024] Figure 1 A schematic diagram of the tool accessory clamping assembly according to an embodiment of the present invention is shown.

[0025] Figure 2 An exploded view schematically showing a tool accessory clamping assembly according to an embodiment of the present invention;

[0026] Figure 3 A schematic diagram of the lock sleeve according to an embodiment of the present invention is shown from a certain perspective.

[0027] Figure 4 A schematic diagram of the lock sleeve according to an embodiment of the present invention is shown from another perspective.

[0028] Figure 5 A schematic cross-sectional view of a tool accessory clamping assembly according to an embodiment of the present invention is shown. Figure 1 ;

[0029] Figure 6 A schematic cross-sectional view of a tool accessory clamping assembly according to an embodiment of the present invention is shown. Figure 2 .

[0030] The labels in the attached diagram are as follows:

[0031] 100. Tool accessories; 110. convex part; 120. concave part;

[0032] 200. Clamp; 210. Open mouth; 220. Ring rib; 230. Attachment clearance notch; 240. Clamp clearance notch;

[0033] 300, sleeve; 310, slot; 320, extension;

[0034] 400, Locking sleeve; 410, Sleeve; 420, Base plate; 421, Insert; 421a, Rectangular opening; 421b, Arc-shaped opening; 430, Locking ring; 431, Locking wall; 432, Positioning shoulder; 433, Circumferential surface; 440, Accessory positioning boss; 450, Clip positioning boss; 460, Limiting groove; 470, Actuating part; 471, Slot;

[0035] 500, Torsion spring;

[0036] 600. Compression spring;

[0037] 700. Snap ring. Detailed Implementation

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] Figure 1 A schematic diagram of the tool accessory clamping assembly according to an embodiment of the present invention is shown. Figure 2 An exploded view of a tool accessory clamping assembly according to an embodiment of the present invention is shown schematically. Figure 3 The schematic diagram shows the structure of the lock sleeve 400 according to an embodiment of the present invention from a certain perspective. Figure 4 A schematic diagram of the lock sleeve 400 according to an embodiment of the present invention is shown from another perspective. For example... Figures 1 to 4 As shown, this utility model proposes a tool accessory clamping assembly. The tool accessory 100 (such as a saw blade or a cutting blade) is provided with a protrusion 110 and a recess 120 connected in sequence. The tool accessory clamping assembly includes a chuck 200, a sleeve 300, a locking sleeve 400, and a torsion spring 500. The chuck 200 has an opening 210. The top of the sleeve 300 is inserted into the opening 210, and the sleeve 300 has a slot 310, through which the tool accessory 100 can be vertically inserted into the sleeve 300 via the slot 310. The locking sleeve 400 includes a sleeve... The sleeve 410 and the base plate 420 connected to the bottom of the sleeve 410 are included. The sleeve 410 is rotatably fitted onto the chuck 200. The base plate 420 has an insertion slot 421 that allows the tool accessory 100 to pass through. A locking ring 430 is provided on the base plate 420. The locking ring 430 is arranged along the inner circumference of the sleeve 410, and an accessory positioning boss 440 is provided on the inner ring of the locking ring 430. A torsion spring 500 is disposed inside the sleeve 410 and fitted onto the chuck 200. The restoring force of the torsion spring 500 can drive the locking sleeve 400 counterclockwise. Figure 3 Rotate in the opposite direction of the arrow; after the locking sleeve 400 rotates into place, the protrusion 110 of the tool accessory 100 and the accessory positioning boss 440 abut against each other, and the locking ring 430 and the clamp 300 are fitted and interference-fitted so that the clamp 300 clamps the tool accessory 100.

[0043] By applying the tool accessory clamping assembly provided in this technical solution, during the installation of tool accessory 100, the operator first needs to insert tool accessory 100 sequentially into the socket 421 on the locking sleeve 400 and the slot 310 on the clamping sleeve 300. Once tool accessory 100 is fully inserted, the torsion spring 500 automatically drives the locking sleeve 400 to rotate counterclockwise. This action causes the accessory positioning boss 440 to rotate below the protrusion 110 of tool accessory 100. At this time, the accessory positioning boss 440 and the protrusion 110 of tool accessory 100 abut against each other, effectively preventing tool accessory 100 from detaching from the locking sleeve 400. Simultaneously, the locking ring 430 applies circumferential pressure to the clamping sleeve 300, clamping the workpiece accessory. When it is necessary to remove tool accessory 100, the operator only needs to rotate clockwise (…). Figure 3 Rotate the locking sleeve 400 (in the direction indicated by the middle arrow) until the insertion port 421 aligns with the protrusion 110 on the tool accessory 100, and then remove the tool accessory 100 from the clamping assembly. In summary, this clamping assembly not only enables quick assembly and disassembly of the tool accessory 100, but also, after the tool accessory 100 is installed, the interference fit between the locking ring 430 and the clamp 300 causes the clamp 300 to be compressed by the locking ring 430, resulting in the slot 310 contracting. Simultaneously, the clamp 300 tightly clamps the tool accessory 100, ensuring that the tool accessory 100 does not wobble during operation, thus guaranteeing operational stability and accuracy.

[0044] In some embodiments, a lever portion 470 is provided on the outer side of the sleeve 410. During installation and removal, the locking sleeve 400 can be rotated by pressing the lever portion 470. A slot 471 is provided on the lever portion 470, and one end of the torsion spring 500 is inserted into the slot 471, while the other end is fixedly connected to the chuck 200. When the lever portion 470 is turned clockwise, the torsion spring 500 is torn by force, and the restoring force of the torsion spring 500 is in the counterclockwise direction. Understandably, in other embodiments, the restoring force of the torsion spring 500 can also be in the clockwise direction; when the tool accessory 100 needs to be removed, the lever portion 470 needs to be turned counterclockwise. In practical applications, either a left-handed or right-handed torsion spring 500 can be selected according to usage needs; no specific limitation is made here.

[0045] In one embodiment, the end face of the accessory positioning boss 440 can be a plane. Designing the accessory positioning boss 440 as a plane ensures that it stably supports the protrusion 110 of the tool accessory 100, effectively preventing the tool accessory 100 from becoming loose. In another embodiment, the end face of the accessory positioning boss 440 can be a slope that gradually rises clockwise. Setting the accessory positioning boss 440 as a slope allows the tool accessory 100 to rotate more smoothly onto the accessory positioning boss 440. Of course, in some embodiments, the accessory positioning boss 440 can also be designed to transition from a slope to a plane. By setting the accessory positioning boss 440 to a slope-to-plane transition, during the installation of the tool accessory 100, the protrusion 110 of the tool accessory 100 gradually rotates from the slope to the plane. Therefore, this allows the locking sleeve 400 to rotate smoothly relative to the tool accessory 100 and ensures that the tool accessory 100 receives stable support after installation.

[0046] In this embodiment, the sleeve 300 has a plate-like structure, which provides it with a certain degree of elasticity. When the sleeve 300 is pressed by the locking protrusion 430, the slot 310 on the sleeve 300 will correspondingly narrow its width. When it is no longer pressed by the locking protrusion 430, the sleeve 300 can automatically rebound due to its inherent elasticity, thus facilitating the insertion of the tool accessory 100 and allowing it to smoothly enter the slot 310. Furthermore, to enhance the strength and stability of the sleeve 300, the bottom of the sleeve 300 is widened to form an extension 320. The outer side of this extension 320 is designed to make close contact with the inner wall of the locking ring 430, a design that helps to achieve a more robust interference fit. In the current embodiment, the extension 320 is designed in a trapezoidal shape with rounded corners, a design that is not only aesthetically pleasing but also effectively reduces wear caused by friction during long-term use. Of course, depending on different usage needs and scenarios, the shape of the extension 320 can also be rectangular, arc-shaped, or any other shape.

[0047] In some embodiments, the sleeve 300 may also be a cylindrical structure, with the slot 310 being a straight line in the radial cross-section of the cylindrical structure. Alternatively, the top of the sleeve 300 may be a plate-like structure, and the bottom a cylindrical structure. The sleeve 300 may be configured according to usage requirements, and no specific limitation is made here, as long as it can be interference-fitted with the locking ring 430 and can achieve the purpose of clamping the tool accessory 100.

[0048] Further, see Figure 2 and Figure 3The insertion port 421 includes a rectangular port 421a and fan-shaped ports 421b respectively disposed on both sides of the rectangular port 421a. The fan-shaped ports 421b and the rectangular port 421a are connected. The tool accessory 100 is inserted into the insertion port 421 through the rectangular port 421a. When the recess 120 is facing the base plate 420, the torsion spring 500 can drive the locking sleeve 400 to rotate so that the recess 120 is located in the fan-shaped port 421b.

[0049] During the assembly of tool accessory 100, it is first necessary to ensure that tool accessory 100 is aligned with rectangular opening 421a, and then tool accessory 100 is inserted into slot 310. When tool accessory 100 is correctly inserted into the corresponding positions of recess 120 and base plate 420, due to the presence of fan-shaped opening 421b and the restoring force of torsion spring 500, locking sleeve 400 can rotate counterclockwise. Understandably, the position of fan-shaped opening 421b corresponds to the position of accessory positioning boss 440, so that when recess 120 is exactly located at the position of fan-shaped opening 421b, boss 110 will be exactly above accessory positioning boss 440.

[0050] Furthermore, the open end of the chuck 200 is provided with an accessory clearance notch 230 for engaging with the protrusion 110 of the tool accessory 100. When the protrusion 110 is inserted into the accessory clearance notch 230, the recess 120 and the base plate 420 are opposite each other.

[0051] Optionally, the open end of the chuck 200 is inserted into the locking ring 430 of the lock sleeve 400. The accessory clearance notch 230 allows the tool accessory 100 to be inserted into the slot 310, while also providing circumferential positioning of the tool accessory 100 and the chuck 200 to prevent them from shifting. When it is necessary to remove the tool accessory 100, the lock sleeve 400 must be rotated so that the rectangular opening 421a on the lock sleeve 400 aligns with the protrusion 110, which is equivalent to the rectangular opening 421a aligning with the accessory clearance notch 230.

[0052] See Figure 4 The locking ring 430 is used to make an interference fit with the sleeve 300. The wall surface of the locking ring 430 is the locking wall surface 431. The distance from the locking wall surface 431 to the central axis of the sleeve 400 gradually decreases in the clockwise direction.

[0053] With this structural design, the side of the sleeve 300 contacts the locking wall 431. After the tool accessory 100 is inserted into the clamping assembly, the torsion spring 500 drives the locking sleeve 400 to rotate counterclockwise. During this process, the sleeve 300 is gradually squeezed by the locking wall 431. In other words, the sleeve 300 can gradually clamp the tool accessory 100 to prevent the tool accessory 100 from shaking.

[0054] Furthermore, the inner wall of the locking ring 430 is provided with a positioning shoulder 432. The positioning shoulder 432 is connected to the side of the locking wall 431 that is closer to the central axis of the locking sleeve 400. The positioning shoulder 432 is used to abut against the clamp 300 to achieve circumferential positioning of the locking sleeve 400.

[0055] When the locking sleeve 400 rotates to the point where the positioning shoulder 432 and the clamping sleeve 300 abut, the torsion spring 500 can no longer drive the locking sleeve 400 to continue rotating. At this time, the clamping sleeve 300 has been clamped by the locking wall 431. At the same time, the protrusion 110 on the tool accessory 100 abuts against the accessory positioning boss 440, that is, the tool accessory 100 has been installed in place.

[0056] Furthermore, Figure 5 A schematic cross-sectional view of a tool accessory clamping assembly according to an embodiment of the present invention is shown. Figure 1 ; Figure 6 A schematic cross-sectional view of a tool accessory clamping assembly according to an embodiment of the present invention is shown. Figure 2 See also Figures 3 to 6 The tool accessory clamping assembly also includes a compression spring 600, which is disposed in the opening 210. One end of the compression spring 600 abuts against the top of the opening 210, and the other end of the compression spring 600 abuts against the clamp 300.

[0057] Understandably, the compression spring 600 always applies a certain force to the sleeve 300, causing the sleeve 300 to tend to move towards the base plate 420. When installing the tool accessory 100, the tool accessory 100 is inserted into the slot 471 and the sleeve 300 is pushed upward. The compression spring 600 is compressed and contracted. When the recess 120 is directly opposite the base plate 420, the torsion spring 500 drives the locking sleeve 400 to rotate. As a result, the accessory positioning boss 440 rotates to the bottom of the protrusion 110 of the tool accessory 100, and the sleeve positioning boss 450 rotates to the bottom of the sleeve 300. Under the restoring force of the compression spring 600, the sleeve 300 abuts against the sleeve positioning boss 450, thus the tool accessory 100 is stably installed on the clamping assembly. Optionally, the chuck 200 is provided with a sleeve clearance notch 240. When the tool accessory 100 pushes the sleeve 300 to move towards the top of the opening 210, the bottom of the sleeve 300 is inserted into the sleeve clearance notch 240. That is, the sleeve clearance notch 240 provides space for the axial movement of the sleeve 300. At the same time, the sleeve clearance notch 240 achieves circumferential limiting of the sleeve 300 and the chuck 200, preventing relative rotation between the sleeve 300 and the chuck 200.

[0058] Furthermore, the inner ring of the locking ring 430 is provided with a sleeve positioning boss 450. The end face of the locking ring 430 is higher than the end face of the sleeve positioning boss 450. The sleeve positioning boss 450 and the accessory positioning boss 440 are spaced apart to form a limiting groove 460. The central axis of the limiting groove 460 is perpendicular to the central axis of the insertion port 421. When the sleeve positioning boss 450 is facing the sleeve 300, the sleeve 300 can abut against the sleeve positioning boss 450 under the restoring force of the compression spring 600. When the limiting groove 460 is facing the sleeve 300, the sleeve 300 can be inserted into the limiting groove 460 under the restoring force of the compression spring 600.

[0059] Understandably, when the protrusion 110 of the tool accessory 100 abuts against the accessory positioning boss 440, the collet 300 abuts against the collet positioning boss 450. After the tool accessory 100 and the lock sleeve 400 separate, the torsion spring 500 will drive the lock sleeve 400 to rotate. When the lock sleeve 400 rotates to the point where the limiting groove 460 and the collet 300 are aligned, the collet 300 will be pushed into the limiting groove 460 by the restoring force of the compression spring 600, thereby preventing the restoring force of the torsion spring 500 from causing the lock sleeve 400 to continue rotating. In addition, with the collet 300 engaged in the limiting groove 460, the rectangular opening 421a is aligned with the collet clearance notch 240 on the collet 200, so when installing the tool accessory 100, it can be directly inserted without rotating the lock sleeve 400. In the prior art, when installing tool accessory 100, it is usually necessary to rotate the locking sleeve 400 to insert tool accessory 100 into the clamping assembly. However, this technical solution uses the limiting groove 460 to engage the clamping sleeve 300, eliminating the step of rotating the locking sleeve 400 when installing tool accessory 100, thus making the installation process more convenient.

[0060] Since the slot 310 is located on the central axis of the sleeve 300, and the tool accessory 100 is perpendicularly connected to the sleeve 300, the central axis of the limiting slot 460 and the central axis of the socket 421 should be perpendicular. Furthermore, an accessory positioning boss 440 and a sleeve positioning boss 450 are respectively provided on each side of the central axis of the socket 421, so that both sides of the central axis of the sleeve 300 and both sides of the central axis of the tool accessory 100 can be effectively supported.

[0061] Furthermore, along the clockwise direction, the height of the jacket positioning boss 450 gradually decreases. When the locking sleeve 400 rotates counterclockwise relative to the jacket 300, the restoring force of the compression spring 600 pushes the jacket 300 to move toward the jacket positioning boss 450 and abut against it.

[0062] The height of the locating boss 450 of the clamp gradually decreases, which means the height of the locking wall surface 431 gradually increases. As a result, the clamp 300, pushed by the compression spring 600, can gradually move downwards along the locking ring 430. The contact area between the clamp 300 and the locking wall surface 431 gradually increases, allowing the locking ring 430 to apply greater compressive force to the clamp 300, thus enabling the clamp 300 to better clamp the tool accessory 100. Furthermore, the top of the clamp 300 is designed to be arc-shaped, allowing the top of the clamp 300 to extend into the inner ring of the compression spring 600. The inclined edge of the top of the clamp 300 contacts the bottom of the compression spring 600, so that while the compression spring 600 pushes the clamp 300 downwards, it can also compress the sides of the clamp 300, making it better clamp the tool accessory 100.

[0063] Furthermore, the tool accessory clamping assembly also includes a retaining ring 700, an annular rib 220 is provided on the outer periphery of the collet 200, the annular rib 220 is located inside the sleeve 410, the inner wall of the sleeve 410 is provided with an annular groove, the retaining ring 700 is engaged in the annular groove, the retaining ring 700 and the side of the annular rib 220 facing away from the open end of the collet 200 abut against each other, and the torsion spring 500 is located between the end face of the annular rib 220 and the locking ring 430.

[0064] The rotatable connection between the collet 200 and the locking sleeve 400 is achieved by the snap ring 700, resulting in a simple overall structure and convenient assembly. Optionally, the ring rib 220 is provided with a socket for connecting with the torsion spring 500, with the end of the torsion spring 500 away from the actuating part 470 inserted into the socket. When assembling the clamping assembly, the collet 300 and the torsion spring 500 can be placed into the inside of the locking sleeve 400 in sequence, then the compression spring 600 can be placed into the opening 210 of the collet 200, the collet 200 and the locking sleeve 400 can be inserted, and the ring rib 220 can be positioned below the ring groove. Finally, the snap ring 700 can be inserted into the ring groove.

[0065] In this embodiment, when the clamping assembly is not connected to the tool accessory 100, the rectangular opening 421a on the locking sleeve 400 and the accessory clearance notch 230 on the collet 200 are aligned, and the bottom of the collet 300 is inserted into the limiting groove 460. This initial state facilitates the installation of the tool accessory 100. Specifically, when assembly is required, the entire process can be performed according to the following steps:

[0066] First, the tool accessory 100 is inserted into the slot 310 of the clamp 300 through the insertion port 421 on the locking sleeve 400. At this time, the tool accessory 100 will abut against the clamp 300 and move towards the top of the opening 210. This action causes the compression spring 600 to be compressed, and the contraction force of the compression spring 600 causes the bottom of the clamp 300 to move away from the limiting groove 460. As this process continues, the locking sleeve 400 begins to rotate counterclockwise under the restoring force of the torsion spring 500. The accessory positioning boss 440 then rotates to the bottom of the protrusion 110 of the tool accessory 100, while the clamp positioning boss 450 rotates to the bottom of the clamp 300. Under the restoring force of the compression spring 600, the tool accessory 100 and the accessory positioning boss 440 begin to abut against each other, and the clamp 300 gradually moves down and contacts the clamp positioning boss 450. The outer side of the extension 320 on the sleeve 300 is pressed by the locking ring 430, gradually clamping the tool accessory 100. When the locking sleeve 400 rotates to a certain angle, the bottom of the sleeve 300 abuts against the side of the positioning shoulder 432, at which point the locking sleeve 400 can no longer rotate, and the tool accessory 100 is installed in place.

[0067] When it is necessary to remove the tool accessory 100, the operator can manually press the toggle switch 470 to rotate the locking sleeve 400 clockwise, so that the rectangular opening 421a of the insertion port 421 is aligned with the protrusion 110 on the tool accessory 100. At the same time, the limiting groove 460 will also rotate to a position aligned with the bottom of the clamp 300. Under the restoring force of the compression spring 600, the clamp 300 moves downward and inserts into the limiting groove 460. At this time, the tool accessory 100 is pushed out by the clamp 300, and then the operator can easily remove the tool accessory 100 from the clamping assembly, completing the unloading process.

[0068] This technical solution also provides an electric tool, characterized in that it includes a drive unit, a tool accessory 100 and the above-mentioned tool accessory clamping assembly, wherein the tool accessory 100 is inserted into the slot 310 through the insertion port 421, and the drive unit is connected to the chuck 200 for driving the chuck 200 to reciprocate.

[0069] Optionally, the driving component can be a motor, and the tool accessory 100 can be a saw blade or a cutting blade. When replacing the tool accessory 100 using the power tool provided by this technical solution, simply rotate the locking sleeve 400 clockwise so that the rectangular notch 421a of the locking sleeve 400 aligns with the protrusion 110 on the tool accessory 100. Then, pull out the tool accessory 100 and directly pass the tool accessory 100 to be replaced through the insertion port 421 on the locking sleeve 400, so that the tool accessory 100 presses against the clamping sleeve 300 until the locking sleeve 400 can rotate automatically under the drive of the torsion spring 500. The clamping sleeve 300 then falls into the limiting groove 460 under the push of the compression spring 600, thus completing the installation.

[0070] The above are merely preferred embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the scope of protection of this utility model. Therefore, the scope of protection of this utility model should be determined by the scope of the claims.

Claims

1. A tool accessory clamping assembly, wherein the tool accessory (100) is provided with a protrusion (110) and a recess (120) connected in sequence, characterized in that, The tool accessory clamping assembly includes a chuck (200), a sleeve (300), a locking sleeve (400), and a torsion spring (500); The chuck (200) has an open mouth (210); The top of the sleeve (300) is inserted into the opening (210), and the sleeve (300) has a slot (310) through which the tool accessory (100) can be vertically inserted into the sleeve (300) via the slot (310); The locking sleeve (400) includes a sleeve (410) and a base plate (420) connected to the bottom of the sleeve (410). The sleeve (410) is rotatably fitted onto the chuck (200). The base plate (420) has an opening (421) that allows the tool accessory (100) to pass through. A locking ring (430) is provided on the base plate (420). The locking ring (430) is arranged along the inner circumference of the sleeve (410). An accessory positioning boss (440) is provided on the inner ring of the locking ring (430). The torsion spring (500) is disposed inside the sleeve (410) and sleeved on the chuck (200). The restoring force of the torsion spring (500) can drive the locking sleeve (400) to rotate counterclockwise. After the locking sleeve (400) rotates into place, the protrusion (110) of the tool accessory (100) and the accessory positioning boss (440) abut against each other, and the locking ring (430) and the clamp (300) are fitted and interference-fitted so that the clamp (300) clamps the tool accessory (100).

2. The tool accessory clamping assembly according to claim 1, characterized in that, The wall surface of the locking ring (430) used for interference connection with the sleeve (300) is the locking wall surface (431). The distance from the locking wall surface (431) to the central axis of the sleeve (400) gradually decreases in the clockwise direction.

3. The tool accessory clamping assembly according to claim 2, characterized in that, The inner wall of the locking ring (430) is provided with a positioning shoulder (432). The positioning shoulder (432) is connected to the side of the locking wall (431) that is closer to the central axis of the locking sleeve (400). The positioning shoulder (432) is used to abut against the clamp (300) to achieve circumferential positioning of the locking sleeve (400).

4. The tool accessory clamping assembly according to any one of claims 1-3, characterized in that, The tool accessory clamping assembly also includes a compression spring (600), which is disposed in the opening (210). One end of the compression spring abuts against the top of the opening (210), and the other end of the compression spring (600) abuts against the clip (300).

5. The tool accessory clamping assembly according to claim 4, characterized in that, The inner ring of the locking ring (430) is provided with a sleeve positioning boss (450). The end face of the locking ring (430) is higher than the end face of the sleeve positioning boss (450). The sleeve positioning boss (450) and the accessory positioning boss (440) are spaced apart to form a limiting groove (460). The central axis of the limiting groove (460) is perpendicular to the central axis of the insertion port (421). When the sleeve positioning boss (450) is facing the sleeve (300), the sleeve (300) can abut against the sleeve positioning boss (450) under the restoring force of the compression spring (600). When the limiting groove (460) is facing the sleeve (300), the sleeve (300) can be inserted into the limiting groove (460) under the restoring force of the compression spring (600).

6. The tool accessory clamping assembly according to claim 5, characterized in that, Along the clockwise direction, the height of the sleeve positioning boss (450) gradually decreases. When the locking sleeve (400) rotates counterclockwise relative to the sleeve (300), the restoring force of the compression spring (600) pushes the sleeve (300) to move toward the sleeve positioning boss (450) and abut against the sleeve positioning boss (450).

7. The tool accessory clamping assembly according to any one of claims 1-3, characterized in that, The socket (421) includes a rectangular opening (421a) and fan-shaped openings (421b) respectively disposed on both sides of the rectangular opening (421a). The fan-shaped openings (421b) and the rectangular opening (421a) are connected. The tool accessory (100) is inserted into the socket (421) through the rectangular opening (421a). When the recess (120) is facing the base plate (420), the torsion spring (500) can drive the locking sleeve (400) to rotate so that the recess (120) is located in the fan-shaped opening (421b).

8. The tool accessory clamping assembly according to any one of claims 1-3, characterized in that, The chuck (200) has an attachment clearance notch (230) at its open end for engaging with the protrusion (110) of the tool attachment (100). When the protrusion (110) is inserted into the attachment clearance notch (230), the recess (120) and the base plate (420) are opposite each other.

9. The tool accessory clamping assembly according to any one of claims 1-3, characterized in that, The tool accessory clamping assembly also includes a retaining ring (700), and the outer periphery of the collet (200) is provided with an annular rib (220). The annular rib (220) is located inside the sleeve (410). The inner wall of the sleeve (410) is provided with an annular groove. The retaining ring (700) is engaged with the annular groove. The retaining ring (700) and the annular rib (220) abut against the side of the collet (200) away from the open end. The torsion spring (500) is located between the annular rib (220) and the end face of the locking ring (430).

10. A power tool, characterized in that, The device includes a drive unit, a tool accessory (100), and a tool accessory clamping assembly according to any one of claims 1-9, wherein the tool accessory (100) is inserted into the slot (310) through the socket (421), and the drive unit is connected to the chuck (200) for driving the chuck (200) to reciprocate.

Images