Tool accessory clamping assembly and electric tool

Abstract

The invention 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 chuck, 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] The invention belongs to the technical field of power tools, and in particular relates to a tool accessory clamping assembly and an electric tool. Background Art

[0002] When it is necessary to cut or saw off a workpiece, a power tool that can achieve reciprocating motion is often needed. The accessories of such tools are often saw blades or blades. In order to ensure that the saw blades or blades can stably and efficiently cut or saw off the workpiece, the tool accessories need to be stably clamped on the clamping assembly. In addition, when cutting materials such as wood or metal, the tool accessories are easily worn and need to be replaced frequently. Therefore, the clamping assembly should be able to achieve rapid clamping and disassembly of the tool accessories to ensure that the cutting work can be carried out efficiently.

[0003] In the prior art, in order to realize the quick installation of tool accessories, the patent application number 200510050178.8 discloses a patent for a quick chuck of an electric jig saw, which includes a clamp, a lock sleeve, and a lock sleeve reset torsion spring. The lock sleeve and the clamp are provided with matching reset tightening threads, a compression spring is provided in the clamp cavity, and a positioning pressure piece is provided in front of the compression spring and is slidably positioned in the clamp cavity. A saw end positioning groove is provided on the front end of the positioning pressure piece. In actual applications, due to the various thickness specifications of saw blades or blades, the clamping assembly should be able to adapt to a variety of tool accessories. When clamping thinner tool accessories, the clamping assembly similar to the above-mentioned one is often unstable. The shaking of the tool accessories during use will cause the cutting accuracy to deteriorate, and even affect the operation of the cutting cover.

[0004] Therefore, there is an urgent need to provide a tool accessory clamping assembly and an electric tool to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a clamping assembly that can quickly load and unload tool accessories and can clamp tool accessories. This object is achieved through the following technical solutions:

[0006] A first aspect of the present invention provides a tool accessory clamping assembly, wherein the tool accessory is provided with a convex portion and a concave portion connected in sequence, and the tool accessory clamping assembly comprises a chuck, a chuck sleeve, a locking sleeve and a torsion spring;

[0007] The chuck has an open cavity;

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

[0009] The locking sleeve comprises a sleeve and a bottom plate connected to the bottom of the sleeve, the sleeve is rotatably sleeved on the chuck, the bottom plate is provided with a socket for allowing the tool accessory to pass through, a locking ring is provided on the bottom plate, the locking ring is provided along the inner circumference of the sleeve, and the inner ring of the locking ring is provided with an accessory positioning boss;

[0010] The torsion spring is arranged 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 is rotated into place, the convex portion of the tool accessory abuts against the accessory positioning boss, and the locking ring and the sleeve are sleeved and interference connected, so that the sleeve clamps the tool accessory.

[0012] By applying the tool accessory clamping assembly provided by the present technical solution, during the process of installing the tool accessory, the operator first needs to insert the tool accessory into the socket on the locking sleeve and the slot on the collet in sequence. When the tool accessory is fully inserted into place, the torsion spring will automatically drive the locking sleeve to rotate counterclockwise. This action causes the accessory positioning boss to rotate to the bottom of the convex part of the tool accessory. At this time, the accessory positioning boss and the convex part of the tool accessory abut against each other, effectively preventing the tool accessory from escaping from the locking sleeve. At the same time, the locking ring will apply circumferential pressure to the collet, so that the collet clamps the workpiece accessory. When the tool accessory needs to be removed, the operator only needs to rotate the locking sleeve clockwise until the socket is aligned with the convex part on the tool accessory, and then remove the tool accessory from the clamping assembly. In general, the clamping assembly not only enables quick assembly and disassembly of tool accessories, but also after the tool accessories are installed in place, due to the interference connection formed between the locking ring and the sleeve, the sleeve is squeezed by the locking ring, causing the slot to shrink, and at the same time the sleeve tightly clamps the tool accessory, thereby ensuring that the tool accessory will not shake during work, ensuring the stability and accuracy of the operation.

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

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

[0015] In some embodiments of the present invention, the inner wall of the locking ring is provided with a positioning shoulder, which is connected to the side of the locking wall closer to the central axis of the locking sleeve, and the positioning shoulder is used to abut against the sleeve to achieve circumferential positioning of the locking sleeve.

[0016] In some embodiments of the present invention, the tool accessory clamping assembly further comprises a compression spring, which is disposed in the open cavity, one end of the compression spring abuts against the top of the open cavity, and the other end of the compression spring abuts against the sleeve.

[0017] In some embodiments of the present invention, the inner ring of the locking ring is provided with a jacket positioning boss, the end face of the locking ring is higher than the end face of the jacket positioning boss, the jacket positioning boss and the accessory positioning boss are spaced to form a limiting groove, the center axis of the limiting groove is perpendicular to the center axis of the socket, when the jacket positioning boss is facing the jacket, the jacket can abut against the jacket positioning boss under the action of the restoring force of the compression spring, and when the limiting groove is facing the jacket, the jacket can be inserted into the limiting groove under the action of the restoring force of the compression spring.

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

[0019] In some embodiments of the present invention, the socket includes a rectangular opening and fan-shaped openings respectively arranged on both sides of the rectangular opening, the fan-shaped opening is connected to the rectangular opening, the tool accessory is inserted into the socket through the rectangular opening, and 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 the present invention, the opening end of the chuck is provided with an accessory avoidance notch for engaging with the protrusion of the tool accessory, and when the protrusion is inserted into the accessory avoidance notch, the recess and the base plate are opposite.

[0021] In some embodiments of the present invention, the tool accessory clamping assembly also includes a retaining spring, an annular rib is provided on the outer periphery of the chuck, the annular rib is located inside the sleeve, an annular groove is provided on the inner wall of the sleeve, the retaining spring is clamped in the annular groove, the retaining spring and the annular rib abut against one side of the retaining spring and the annular rib facing away from the open end of the chuck, and the torsion spring is located between the annular rib and the end face of the locking ring.

[0022] In a second aspect of the present invention, an electric tool is proposed, which includes a driving member, a tool accessory and a tool accessory clamping assembly in the above-mentioned embodiment, wherein the tool accessory is inserted into the slot through the socket, and the driving member is connected to the chuck to drive the chuck to reciprocate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference numerals are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0024] Figure 1 Schematically shows a schematic structural diagram of a tool accessory clamping assembly according to an embodiment of the present invention;

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

[0026] Figure 3 The structure diagram of the lock sleeve according to the embodiment of the present invention is schematically shown at a certain viewing angle;

[0027] Figure 4 The structure diagram of the lock sleeve according to the embodiment of the present invention is schematically shown in another viewing angle;

[0028] Figure 5 The schematic diagram shows a partial structural cross-section of a tool accessory clamping assembly according to an embodiment of the present invention. Figure 1 ;

[0029] Figure 6 The schematic diagram shows a partial structural cross-section of a tool accessory clamping assembly according to an embodiment of the present invention. Figure 2 .

[0030] The reference numerals in the accompanying drawings represent the following:

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

[0032] 200, chuck; 210, opening cavity; 220, ring rib; 230, accessory avoidance notch; 240, jacket avoidance notch;

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

[0034] 400, locking sleeve; 410, sleeve; 420, bottom plate; 421, socket; 421a, rectangular opening; 421b, arc opening; 430, locking ring; 431, locking wall; 432, positioning shoulder; 433, circumferential surface; 440, accessory positioning boss; 450, jacket positioning boss; 460, limiting groove; 470, toggle portion; 471, card slot;

[0035] 500, torsion spring;

[0036] 600, compression spring;

[0037] 700. Circlip. DETAILED DESCRIPTION

[0038] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0039] It should be understood that the terms used herein are only for the purpose of describing specific example embodiments and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "include", "comprise", "contain", and "have" are inclusive, and therefore specify the existence of stated features, steps, operations, elements and / or parts, but do not exclude the existence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not interpreted as necessarily requiring them to be performed in the specific order described or illustrated, unless the execution order is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0040] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0041] For ease of description, spatial relative terms may be used herein to describe the relationship of one element or feature relative to another element or feature as shown in the figure, such as "inside", "outside", "inner side", "outer side", "below", "below", "above", "above", etc. Such spatial relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is turned over, then the elements described as "below other elements or features" or "below other elements or features" will subsequently be oriented as "above other elements or features" or "above other elements or features". Therefore, the example term "below..." can include both above and below orientations.

[0042] Figure 1 The structural diagram of a tool accessory clamping assembly according to an embodiment of the present invention is schematically shown. Figure 2 An exploded view of a tool accessory clamping assembly according to an embodiment of the present invention is schematically shown. Figure 3 The structure diagram of the lock sleeve 400 according to the embodiment of the present invention is schematically shown at a certain viewing angle. Figure 4 The structure diagram of the lock sleeve 400 according to the embodiment of the present invention is schematically shown in another perspective. Figures 1 to 4 As shown, the present invention proposes a tool accessory clamping assembly, wherein the tool accessory 100 (such as a saw blade or a blade, etc.) is provided with a convex portion 110 and a concave portion 120 connected in sequence, and 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 cavity 210; the top of the sleeve 300 is inserted into the open cavity 210, and the sleeve 300 has a slot 310, and the tool accessory 100 can be vertically plugged into the sleeve 300 through the slot 310; the locking sleeve 400 includes a sleeve 410 and a bottom plate 420 connected to the bottom of the sleeve 410, the sleeve 410 is rotatably mounted on the chuck 200, the bottom plate 420 is provided with a socket 421 for allowing the tool accessory 100 to pass through, a locking ring 430 is provided on the bottom plate 420, the locking ring 430 is arranged along the inner circumference of the sleeve 410, and the inner ring of the locking ring 430 is provided with an accessory positioning boss 440; a torsion spring 500 is arranged inside the sleeve 410 and mounted on the chuck 200, and the restoring force of the torsion spring 500 can drive the locking sleeve 400 to rotate counterclockwise ( Figure 3 After the locking sleeve 400 is rotated into place, the convex portion 110 of the tool accessory 100 abuts against the accessory positioning boss 440, and the locking ring 430 and the collet 300 are sleeved and interference-connected, so that the collet 300 clamps the tool accessory 100.

[0043] By applying the tool accessory clamping assembly provided by the present technical solution, during the process of installing the tool accessory 100, the operator first needs to insert the tool accessory 100 into the socket 421 on the locking sleeve 400 and the slot 310 on the sleeve 300 in sequence. When the tool accessory 100 is fully inserted into place, the torsion spring 500 will automatically drive the locking sleeve 400 to rotate counterclockwise. This action causes the accessory positioning boss 440 to rotate to the bottom of the convex portion 110 of the tool accessory 100. At this time, the accessory positioning boss 440 and the convex portion 110 of the tool accessory 100 abut against each other, effectively preventing the tool accessory 100 from escaping from the locking sleeve 400. At the same time, the locking ring 430 will apply circumferential pressure to the sleeve 300, so that the sleeve 300 clamps the workpiece accessory. When the tool accessory 100 needs to be removed, the operator only needs to turn it clockwise ( Figure 3 The locking sleeve 400 is rotated in the direction indicated by the arrow in the middle until the socket 421 is aligned with the protrusion 110 on the tool accessory 100, and then the tool accessory 100 is removed from the clamping assembly. In general, the clamping assembly can not only realize the rapid assembly and disassembly of the tool accessory 100, but also after the tool accessory 100 is installed in place, due to the interference fit formed between the locking ring 430 and the collet 300, the collet 300 is squeezed by the locking ring 430, so that the slot 310 shrinks, and the collet 300 tightly clamps the tool accessory 100, thereby ensuring that the tool accessory 100 will not shake during the working process, and ensuring the stability and accuracy of the operation.

[0044] In some embodiments, a toggle portion 470 is provided on the outer side of the sleeve 410, and during the loading and unloading process, the lock sleeve 400 can be rotated by pressing the toggle portion 470. A slot 471 is provided on the toggle portion 470, and one end of the torsion spring 500 is inserted into the slot 471, and the other end is fixedly connected to the chuck 200. When the toggle portion 470 is toggled clockwise, the torsion spring 500 is twisted by force, and the direction of the restoring force of the torsion spring 500 is counterclockwise. It can be understood that in other embodiments, the direction of the restoring force of the torsion spring 500 can also be clockwise, and when the tool accessory 100 needs to be removed, the toggle portion 470 needs to be toggled counterclockwise. In actual applications, a left-handed torsion spring 500 or a right-handed torsion spring 500 can be selected according to the needs of use, and no specific limitation is made here.

[0045] In one embodiment, the end surface of the accessory positioning boss 440 may be a plane. Designing the accessory positioning boss 400 as a plane can ensure that the accessory positioning boss 400 stably supports the convex portion 110 of the tool accessory 100, and can effectively prevent the tool accessory 100 from loosening. In another embodiment, the end surface of the accessory positioning boss 440 may be an inclined surface that gradually rises in the clockwise direction. Setting the accessory positioning boss 400 as an inclined surface can make the tool accessory 100 rotate onto the accessory positioning boss 400 more smoothly. Of course, in some embodiments, the accessory positioning boss 400 can also be set in a form of transition from an inclined surface to a plane. Setting the accessory positioning boss 400 in a form of transition from an inclined surface to a plane, during the installation process of the tool accessory 100, the convex portion 110 of the tool accessory 100 gradually rotates from the inclined surface to the plane, so that the locking sleeve 400 can be smoothly rotated relative to the tool accessory 100, and the tool accessory 100 can be stably supported after being installed in place.

[0046] In this embodiment, the jacket 300 is a plate-like structure, and the plate-like structure can make it have a certain elasticity. When the jacket 300 is squeezed by the locking protrusion 430, the slot 310 on the jacket 300 will reduce its width accordingly. When it is no longer squeezed by the locking protrusion 430, the jacket 300 can automatically rebound by virtue of its inherent elasticity, which provides convenience for the insertion of the tool accessory 100, so that it can smoothly enter the slot 310. In addition, in order to enhance the strength and stability of the jacket 300, the bottom of the jacket 300 is widened to form an extension 320. The outer side of the extension 320 is used to closely contact the inner wall of the locking ring 430, and such a design helps to achieve a more stable interference connection. In the current embodiment, the extension 320 is designed in a trapezoidal shape, and a rounded transition design is adopted at the corners. Such a design is not only beautiful, but also can effectively reduce the wear caused by friction during long-term use. Of course, according to different usage requirements and scenarios, the shape of the extension portion 320 can also be rectangular, arc-shaped, or any other shape.

[0047] In some embodiments, the jacket 300 may also be a cylindrical structure, and the slot 310 may be in a straight line shape on a radial cross section of the cylindrical structure. Alternatively, the top of the jacket 300 may be a sheet-like structure, and the bottom may be a cylindrical structure. The jacket 300 may be configured according to usage requirements, and is not specifically limited here, as long as it can be interference-connected with the locking ring 430 and can achieve the purpose of the clamping tool accessory 100.

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

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

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

[0051] Optionally, the open end of the collet 200 is inserted into the locking ring 430 of the locking sleeve 400. The setting of the accessory avoidance notch 230 enables the tool accessory 100 to be inserted into the slot 310. At the same time, the circumferential position of the tool accessory 100 and the collet 200 is realized to prevent the tool accessory 100 and the collet 200 from being offset. When the tool accessory 100 needs to be removed, the locking sleeve 400 needs to be rotated so that the rectangular opening 421a on the locking sleeve 400 is opposite to the protrusion 110, which is equivalent to the rectangular opening 421a and the accessory avoidance notch 230 being opposite.

[0052] See also Figure 4 The wall surface of the locking ring 430 used for interference connection with the jacket 300 is the locking wall surface 431. In the clockwise direction, the distance from the locking wall surface 431 to the central axis of the locking sleeve 400 gradually decreases.

[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, and 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, a positioning shoulder 432 is provided on the inner wall of the locking ring 430 . The positioning shoulder 432 is connected to the side of the locking wall 431 closer to the central axis of the locking sleeve 400 . The positioning shoulder 432 is used to abut against the jacket 300 to achieve circumferential positioning of the locking sleeve 400 .

[0055] When the locking sleeve 400 rotates until the positioning shoulder 432 abuts against the sleeve 300, the torsion spring 500 can no longer drive the locking sleeve 400 to continue rotating. At this time, the 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] Further, Figure 5 The schematic diagram shows a partial structural cross-section of a tool accessory clamping assembly according to an embodiment of the present invention. Figure 1 ; Figure 6 The schematic diagram shows a partial structural cross-section of a tool accessory clamping assembly according to an embodiment of the present invention. Figure 2 See also Figures 3 to 6 The tool accessory clamping assembly further includes a compression spring 600 , which is disposed in the opening cavity 210 , one end of the compression spring 600 abuts against the top of the opening cavity 210 , and the other end of the compression spring 600 abuts against the collet 300 .

[0057] It can be understood that the compression spring 600 always applies a certain force to the collet 300, so that the collet 300 has a tendency to move toward the bottom plate 420. When installing the tool accessory 100, the tool accessory 100 is inserted into the slot 471 and the collet 300 is pushed upward, the compression spring 600 is squeezed and contracted, and when the recess 120 is facing the bottom plate 420, the torsion spring 500 drives the lock sleeve 400 to rotate, so that the accessory positioning boss 440 rotates to the bottom of the convex part 110 of the tool accessory 100, and the collet positioning boss 450 rotates to the bottom of the collet 300. The collet 300 abuts against the collet positioning boss 450 under the restoring force of the compression spring 600, so that the tool accessory 100 is stably installed on the clamping assembly. Optionally, a jacket avoidance notch 240 is provided on the chuck 200, and when the tool accessory 100 pushes the jacket 300 to move toward the top of the opening cavity 210, the bottom of the jacket 300 is inserted into the jacket avoidance notch 240. That is, the jacket avoidance notch 240 provides space for the axial movement of the jacket 300, and at the same time, the jacket 300 avoidance notch 240 realizes the circumferential limitation of the jacket 300 and the chuck 200, preventing the jacket 300 and the chuck 200 from rotating relative to each other.

[0058] Furthermore, the inner ring of the locking ring 430 is provided with a jacket positioning boss 450, the end face of the locking ring 430 is higher than the end face of the jacket positioning boss 450, the jacket positioning boss 450 and the accessory positioning boss 440 are arranged at intervals to form a limiting groove 460, the central axis of the limiting groove 460 is perpendicular to the central axis of the socket 421, when the jacket positioning boss 450 is facing the jacket 300, the jacket 300 can be abutted against the jacket positioning boss 450 under the action of the restoring force of the compression spring 600, and when the limiting groove 460 is facing the jacket 300, the jacket 300 can be inserted into the limiting groove 460 under the action of the restoring force of the compression spring 600.

[0059] It can be understood that when the convex portion 110 of the tool accessory 100 abuts against the accessory positioning boss 440, the collet 300 just abuts against the collet positioning boss 450. After the tool accessory 100 and the locking sleeve 400 are separated, the torsion spring 500 will drive the locking sleeve 400 to rotate. When the locking sleeve 400 rotates to the limit groove 460 and the collet 300 is aligned, the collet 300 will be pushed by the restoring force of the compression spring 600 to snap into the limit groove 460, thereby preventing the restoring force of the torsion spring 500 from causing the locking sleeve 400 to continue to rotate. In addition, when the collet 300 is inserted into the limit groove 460, the rectangular opening 421a just faces the collet avoidance notch 240 on the collet 200, so that when installing the tool accessory 100, the tool accessory 100 can be directly inserted without rotating the locking sleeve 400. In the prior art, when installing the tool accessory 100, it is usually necessary to rotate the locking sleeve 400 to insert the tool accessory 100 into the clamping assembly. However, the present technical solution clamps the clamping sleeve 300 through the limiting groove 460, and when installing the tool accessory 100, the step of rotating the locking sleeve 400 is omitted, thereby making the installation process more convenient.

[0060] Since the slot 310 is located on the central axis of the jacket 300, the tool accessory 100 and the jacket 300 are vertically connected, the central axis of the limiting slot 460 should be perpendicular to the central axis of the socket 421. In addition, an accessory positioning boss 440 and a jacket 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 jacket 300 and both sides of the central axis of the tool accessory 100 can be effectively supported.

[0061] Furthermore, the height of the jacket positioning boss 450 gradually decreases in the clockwise direction. 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 the jacket positioning boss 450 .

[0062] The height of the jacket positioning boss 450 gradually decreases, that is, the height of the locking wall 431 gradually increases, so that the jacket 300 can gradually move downward along the locking ring 430 under the push of the compression spring 600, and the contact area between the jacket 300 and the locking wall 431 gradually increases, so that the locking ring 430 can apply a greater extrusion force to the jacket 300, thereby enabling the jacket 300 to better clamp the tool accessory 100. Further, the top of the jacket 300 is designed to be arc-shaped, so that the top of the jacket 300 can extend into the inner ring of the compression spring 600, and the beveled edge of the top of the jacket 300 contacts the bottom of the compression spring 600, so that the compression spring 600 pushes the jacket 300 downward and squeezes the two sides of the jacket 300, so that it can better clamp the tool accessory 100.

[0063] Furthermore, the tool accessory clamping assembly also includes a retaining spring 700, and an annular rib 220 is provided on the outer periphery of the chuck 200. The annular rib 220 is located inside the sleeve 410. An annular groove is provided on the inner wall of the sleeve 410. The retaining spring 700 is clamped in the annular groove. The retaining spring 700 and the annular rib 220 are abutted against one side of the retaining spring 700 facing away from the open end of the chuck 200, and the torsion spring 500 is located between the end face of the annular rib 220 and the locking ring 430.

[0064] The chuck 200 and the lock sleeve 400 are connected in rotation by the retaining ring 700, and the overall structure is simple and easy to assemble. Optionally, the annular rib 220 is provided with a socket for connecting with the torsion spring 500, and the end of the torsion spring 500 away from the toggle portion 470 is inserted into the socket. When assembling the clamping assembly, the chuck 300 and the torsion spring 500 can be placed in the lock sleeve 400 in sequence, and then the compression spring 600 can be placed in the opening 210 of the chuck 200, the chuck 200 and the lock sleeve 400 are plugged, and the annular rib 220 is located below the annular groove, and then the retaining ring 700 is clamped into the annular 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 avoidance notch 230 on the chuck 200 are opposite, and the bottom of the sleeve 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 carried out according to the following steps:

[0066] First, insert the tool accessory 100 into the slot 310 on the collet 300 through the socket 421 on the locking sleeve 400. At this time, the tool accessory 100 will abut against the collet 300 and move toward the top of the opening cavity 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 collet 300 to move away from the limiting groove 460. As this process proceeds, 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 convex portion 110 of the tool accessory 100, and the collet positioning boss 450 rotates to the bottom of the collet 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 collet 300 gradually moves down and contacts the collet positioning boss 450. The outer side of the extension part 320 on the collet 300 is squeezed 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 collet 300 abuts against the side of the positioning shoulder 432, and the locking sleeve 400 cannot continue to rotate, and the tool accessory 100 is installed in place.

[0067] When the tool accessory 100 needs to be removed, the operator can manually press the toggle portion 470 to rotate the lock sleeve 400 clockwise, so that the rectangular opening 421a of the socket 421 faces the convex portion 110 on the tool accessory 100. At the same time, the limiting groove 460 will also rotate to a position facing the bottom of the collet 300. Under the restoring force of the compression spring 600, the collet 300 moves downward and inserts into the limiting groove 460. At this time, the tool accessory 100 is ejected under the push of the collet 300, and then the operator can easily remove the tool accessory 100 from the clamping assembly to complete the unloading process.

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

[0069] Optionally, the driving member can be a motor, and the tool accessory 100 can be a saw blade or a blade. By applying the electric tool provided by the present technical solution, when replacing the tool accessory 100, just rotate the lock sleeve 400 clockwise to make the rectangular notch 421a of the lock sleeve 400 and the convex part 110 on the tool accessory 100 face each other, then pull out the tool accessory 100, and then directly pass the tool accessory 100 to be replaced through the socket 421 on the lock sleeve 400, so that the tool accessory 100 supports the jacket 300, until the lock sleeve 400 can automatically rotate under the drive of the torsion spring 500, and the jacket 300 falls into the limit groove 460 under the push of the compression spring 600, and the installation is completed.

[0070] The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A tool accessory clamping assembly, wherein the tool accessory (100) is provided with a convex portion (110) and a concave portion (120) connected in sequence, characterized in that: The tool accessory clamping assembly comprises a chuck (200), a chuck sleeve (300), a locking sleeve (400) and a torsion spring (500); The chuck (200) has an open cavity (210); The top of the jacket (300) is inserted into the open cavity (210), and the jacket (300) has a slot (310), and the tool accessory (100) can be vertically plugged into the jacket (300) through the slot (310); The locking sleeve (400) comprises a sleeve (410) and a bottom plate (420) connected to the bottom of the sleeve (410); the sleeve (410) is rotatably mounted on the chuck (200); the bottom plate (420) is provided with a socket (421) for allowing the tool accessory (100) to pass through; a locking ring (430) is provided on the bottom plate (420); the locking ring (430) is arranged along the inner circumference of the sleeve (410); and the inner ring of the locking ring (430) is provided with an accessory positioning boss (440); The torsion spring (500) is arranged inside the sleeve (410) and sleeved on the chuck (200), and the restoring force of the torsion spring (500) can drive the locking sleeve (400) to rotate counterclockwise; After the locking sleeve (400) is rotated into position, the convex portion (110) of the tool accessory (100) abuts against the accessory positioning boss (440), and the locking ring (430) and the collet (300) are sleeved and interference-connected, so that the collet (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 jacket (300) is the locking wall surface (431), and the distance from the locking wall surface (431) to the central axis of the locking 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), and the positioning shoulder (432) is connected to the side of the locking wall surface (431) closer to the central axis of the locking sleeve (400). The positioning shoulder (432) is used to abut against the sleeve (300) to achieve circumferential positioning of the locking sleeve (400).

4. The tool accessory clamping assembly according to any one of claims 1 to 3, characterized in that: The tool accessory clamping assembly also includes a compression spring (600), which is arranged in the open cavity (210), one end of the compression spring abuts against the top of the open cavity (210), and the other end of the compression spring (600) abuts against the sleeve (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 jacket positioning boss (450), the end face of the locking ring (430) is higher than the end face of the jacket positioning boss (450), the jacket 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 socket (421), when the jacket positioning boss (450) is facing the jacket (300), the jacket (300) can be abutted against the jacket positioning boss (450) under the action of the restoring force of the compression spring (600), and when the limiting groove (460) is facing the jacket (300), the jacket (300) can be inserted into the limiting groove (460) under the action of the restoring force of the compression spring (600).

6. The tool accessory clamping assembly according to claim 5, characterized in that: The height of the jacket positioning boss (450) gradually decreases in the clockwise direction. 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 the jacket positioning boss (450).

7. The tool accessory clamping assembly according to any one of claims 1 to 3, characterized in that: The socket (421) comprises a rectangular opening (421a) and fan-shaped openings (421b) respectively arranged on both sides of the rectangular opening (421a); ​​the fan-shaped opening (421b) is connected to the rectangular opening (421a); ​​the tool accessory (100) is inserted into the socket (421) through the rectangular opening (421a); ​​when the recess (120) faces the bottom plate (420), the torsion spring (500) can drive the lock 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 to 3, characterized in that: The opening end of the chuck (200) is provided with an accessory avoidance notch (230) for engaging with the protrusion (110) of the tool accessory (100); when the protrusion (110) is inserted into the accessory avoidance notch (230), the recess (120) and the bottom plate (420) are opposite to each other.

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

10. An electric tool, characterized in that: It comprises a driving member, a tool accessory (100) and a tool accessory clamping assembly according to any one of claims 1 to 9, wherein the tool accessory (100) is inserted into the slot (310) through the socket (421), and the driving member is connected to the chuck (200) for driving the chuck (200) to reciprocate.

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