Tool accessory mounting assembly and power tool

Abstract

The present application belongs to the technical field of power tools, and particularly relates to a tool accessory clamping assembly and an electric power tool. The tool accessory clamping assembly comprises a chuck, a sleeve, a lock sleeve and a torsional spring. The chuck has an open cavity. The top of the sleeve is inserted into the open cavity, and a tool accessory can be perpendicularly inserted into the sleeve. The lock sleeve comprises a sleeve and a bottom plate. The sleeve is rotatably sleeved on the chuck, and the bottom plate is provided with a socket. A locking ring is arranged on the bottom plate and along the inner wall of the sleeve. An accessory positioning boss is arranged on the inner ring of the locking ring. The torsional spring is arranged inside the sleeve and sleeved on the chuck. The restoring force of the torsional spring can drive the lock sleeve to rotate counterclockwise. After the lock sleeve is rotated into position, the convex part of the tool accessory abuts against the accessory positioning boss, and the locking ring is sleeved and connected with the sleeve in interference fit, so that the sleeve clamps the tool accessory. By using the tool accessory clamping assembly in the technical solution, the tool accessory can be quickly assembled and disassembled, and the clamping assembly can clamp the tool accessory.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power tools, and particularly relates to a tool accessory clamping assembly and an electric power tool. BACKGROUND

[0002] When cutting or sawing workpieces, power tools capable of reciprocating motion are often needed. The accessories of such tools are often saw blades or blades, and in order to ensure that the saw blades or blades can stably and efficiently cut or saw workpieces, the tool accessories need to be stably clamped on the clamping assembly. In addition, when cutting wood or metal materials, the tool accessories are prone to wear and tear, and need to be frequently replaced. Therefore, the clamping assembly should be able to quickly clamp and disassemble the tool accessories to ensure efficient cutting work.

[0003] In the prior art, in order to achieve quick clamping of tool accessories, a patent with the application number 200510050178.8 discloses a quick clamp for electric curved saws, which includes a clamp, a lock sleeve, a lock sleeve return torsional spring, a return screw thread matched on the lock sleeve and the clamp, a compression spring arranged in the clamp cavity, a positioning compression piece arranged in front of the compression spring and slidingly positioned in the clamp cavity, and a saw blade end positioning groove arranged on the front end of the positioning compression piece. In actual application, since the thickness specifications of saw blades or blades are various, the clamping assembly should be able to adapt to various tool accessories. However, when clamping thin tool accessories, clamping assemblies similar to the above often have unstable clamping, and the tool accessories will shake during use, which will lead to poor cutting accuracy and even affect the cutting work.

[0004] Therefore, it is urgent to provide a tool accessory clamping assembly and an electric power tool to solve the above problems. SUMMARY

[0005] The purpose of the present application is to provide a clamping assembly capable of quickly clamping and disassembling tool accessories. The purpose is achieved by the following technical solutions:

[0006] The first aspect of the present application provides a tool accessory clamping assembly, wherein the tool accessory is provided with a convex part and a concave part connected in sequence, and the tool accessory clamping assembly comprises a clamp head, a clamp sleeve, a lock sleeve and a torsional spring.

[0007] The clamp head has an open cavity.

[0008] The top of the clamp sleeve is inserted into the open cavity, and the clamp sleeve has an insertion slot, and the tool accessory can be vertically inserted into the clamp sleeve through the insertion slot.

[0009] The lock sleeve comprises a sleeve and a bottom plate connected to the bottom of the sleeve, the sleeve is rotatably sleeved on the collet, the bottom plate is provided with an insertion hole allowing the tool accessory to pass through, and a locking ring is arranged on the bottom plate, the locking ring is arranged along the inner periphery of the sleeve, and an accessory positioning boss is arranged on the inner ring of the locking ring.

[0010] The torsional spring is arranged inside the sleeve and sleeved on the collet, and the restoring force of the torsional spring can drive the lock sleeve to rotate counterclockwise.

[0011] After the lock sleeve is rotated to the position, the convex part of the tool accessory abuts against the accessory positioning boss, and the locking ring and the collet are sleeved and connected in interference, so that the collet clamps the tool accessory.

[0012] By using the tool accessory clamping assembly provided by the technical scheme, the operator needs to insert the tool accessory into the insertion hole on the lock sleeve and the insertion slot on the collet in sequence during the installation of the tool accessory. After the tool accessory is completely inserted into the position, the torsional spring automatically drives the lock sleeve to rotate counterclockwise. This action makes the accessory positioning boss rotate to the lower side 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 being separated from the lock sleeve. At the same time, the locking ring exerts a circumferential pressure on 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 lock sleeve clockwise until the insertion hole is aligned with the convex part on the tool accessory, and then the tool accessory can be taken out of the clamping assembly. In general, the clamping assembly not only can realize the quick assembly and quick disassembly of the tool accessory, but also can ensure that the tool accessory does not shake during the work process after the tool accessory is installed in place, because the interference connection is formed between the locking ring and the collet, the collet is extruded by the locking ring, the insertion slot is shrunk, and the collet tightly clamps the tool accessory, thereby ensuring the stability and accuracy of the operation.

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

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

[0015] In some embodiments of the present application, a positioning shoulder is arranged on the inner wall of the locking ring, the positioning shoulder is connected to the side of the locking wall surface closer to the central axis of the lock sleeve, and the positioning shoulder is used to abut against the collet to realize the circumferential positioning of the lock sleeve.

[0016] In some embodiments of the present application, the tool accessory clamping assembly further comprises a compression spring, the compression spring is arranged 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 clamping sleeve.

[0017] In some embodiments of the present application, the inner ring of the locking ring is provided with a clamping sleeve positioning boss, the end face of the locking ring is higher than the end face of the clamping sleeve positioning boss, the clamping sleeve positioning boss and the accessory positioning boss are arranged at intervals to form a limiting groove, the central axis of the limiting groove is perpendicular to the central axis of the socket, when the clamping sleeve is opposite to the clamping sleeve positioning boss, the clamping sleeve can abut against the clamping sleeve positioning boss under the restoring force of the compression spring, and when the limiting groove is opposite to the clamping sleeve, the clamping sleeve can be inserted into the limiting groove under the restoring force of the compression spring.

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

[0019] In some embodiments of the present application, the socket comprises a rectangular port and a sector port arranged on both sides of the rectangular port respectively, the sector port and the rectangular port are communicated, the tool accessory is inserted into the socket through the rectangular port, when the recess is opposite to the bottom plate, the torsion spring can drive the locking sleeve to rotate to make the recess located in the sector port.

[0020] In some embodiments of the present application, the open end of the collet is provided with an accessory avoiding notch for clamping the convex part of the tool accessory, when the convex part is inserted into the accessory avoiding notch, the recess is opposite to the bottom plate.

[0021] In some embodiments of the present application, the tool accessory clamping assembly further comprises a circlip, the outer periphery of the collet is provided with a ring rib, the ring rib is located inside the sleeve, the inner wall of the sleeve is provided with a ring groove, the circlip is clamped in the ring groove, the surface of the ring rib, which is away from the open end of the collet, abuts against the circlip, and the torsion spring is located between the ring rib and the end face of the locking ring.

[0022] In the second aspect of the present application, an electric tool is provided, which comprises a driving member, a tool accessory and the tool accessory clamping assembly in the above-mentioned embodiments, the tool accessory is inserted into the insertion slot through the socket, and the driving member is connected with the collet to drive the collet to reciprocate. BRIEF DESCRIPTION OF DRAWINGS

[0023] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments with reference made to the accompanying drawings. The drawings are for purposes of illustration only and are not intended to be limiting in

[0024] Figure 1 A structural schematic diagram of a tool accessory clamping assembly according to an embodiment of the present application is schematically shown;

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

[0026] Figure 3 A structural schematic diagram of a lock sleeve according to an embodiment of the present application is schematically shown from a certain perspective;

[0027] Figure 4 A structural schematic diagram of a lock sleeve according to an embodiment of the present application is schematically shown from another perspective;

[0028] Figure 5 A partial structural sectional schematic of a tool accessory clamping assembly according to an embodiment of the present application is schematically shown; Figure 1

[0029] Figure 6 A partial structural sectional schematic of a tool accessory clamping assembly according to an embodiment of the present application is schematically shown; Figure 2

[0030] The various tags in the drawings represent the following:

[0031] 100, tool accessory; 110, protrusion; 120, recess;

[0032] 200, collet; 210, open cavity; 220, ring rib; 230, accessory avoiding notch; 240, collet avoiding notch;

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

[0034] 400, lock sleeve; 410, sleeve; 420, bottom plate; 421, insertion opening; 421a, rectangular opening; 421b, arcuate opening; 430, locking ring; 431, locking wall surface; 432, positioning shoulder; 433, circumferential surface; 440, accessory positioning boss; 450, collet sleeve positioning boss; 460, limiting slot; 470, actuating portion; 471, clamping slot;

[0035] 500, torsion spring;

[0036] 600, compression spring; ​​

[0037] 700, a clasp. DETAILED DESCRIPTION

[0038] Example embodiments of the present disclosure will be described more fully hereinafter with reference to the accompanying drawings. While example embodiments of the present disclosure are shown in the drawings, it is understood that the present disclosure can be embodied in many forms and should not be construed as limited to the implementations set forth herein. Rather, these implementations are provided as example so that this disclosure will be thorough and complete, and will fully convey the scope of the present disclosure to those skilled in the art.

[0039] It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises", "comprising", "includes", "including" and the like are to be construed to be inclusive (i.e., to include both instances of open ended terms and instances of terms limiting to a specific number) unless otherwise indicated as otherwise limited by context. The methods described herein can be implemented as a method, an apparatus, a system, a computer program product, or any combination thereof.

[0040] Although the terms first, second, third, and the like can be used herein to describe various 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 be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first", "second", and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

[0041] For ease of description, spatially relative terms can be used herein for the purpose of illustrating one element's or feature's relationship to another element or feature as shown in the figures. Such spatially relative terms include "internal", "external", "inward", "outward", "under", "below", "lower", "above", "upper", and the like. These spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device is inverted, then an element that is described as "below" or "beneath" another element or feature would now be "above" or "over" the other element or feature. Thus, the example term "below" can encompass both an orientation of above and below. The devices can be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

[0042] Figure 1 A structural schematic diagram of a tool accessory clamping assembly according to an embodiment of the present application is schematically shown. Figure 2 An exploded view of a tool accessory clamping assembly according to an embodiment of the present application is schematically shown. Figure 3 A structural schematic diagram of a lock sleeve 400 according to an embodiment of the present application is schematically shown from a certain perspective. Figure 4 A structural schematic diagram of a lock sleeve 400 according to an embodiment of the present application is schematically shown from another perspective. Figures 1 to 4 As shown, the present application proposes a tool accessory clamping assembly, a tool accessory 100 (such as a saw blade or a blade) is provided with a convex portion 110 and a concave portion 120 connected in sequence, the tool accessory clamping assembly comprises a collet 200, a collet sleeve 300, a lock sleeve 400 and a torsion spring 500; the collet 200 has an open cavity 210; the top of the collet sleeve 300 is inserted into the open cavity 210, the collet sleeve 300 has an insertion slot 310, the tool accessory 100 can be vertically inserted through the insertion slot 310 and the collet sleeve 300; the lock sleeve 400 comprises a sleeve 410 and a bottom plate 420 connected to the bottom of the sleeve 410, the sleeve 410 is rotatably sleeved on the collet 200, the bottom plate 420 is provided with an insertion hole 421 allowing the tool accessory 100 to pass through, the bottom plate 420 is provided with a locking ring 430, the locking ring 430 is arranged along the inner periphery of the sleeve 410, 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 collet 200, the restoring force of the torsion spring 500 can drive the lock sleeve 400 to rotate in the direction opposite to the direction indicated by the arrow in the middle (counterclockwise); after the lock sleeve 400 is rotated in 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 sleeve 300 are sleeved and interference-connected, so that the collet sleeve 300 clamps the tool accessory 100. Figure 3

[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 surface of the accessory positioning boss 440 can be a flat surface. Designing the accessory positioning boss 400 as a flat surface can ensure that the accessory positioning boss 400 stably supports the protrusion 110 of the tool accessory 100, effectively preventing the tool accessory 100 from loosening. In another embodiment, the end surface of the accessory positioning boss 440 can be a slope that gradually rises in the clockwise direction. Designing the accessory positioning boss 400 as a slope can make it easier for the tool accessory 100 to rotate onto the accessory positioning boss 400. Of course, in some embodiments, the accessory positioning boss 400 can also be designed as a transition from a slope to a flat surface. Designing the accessory positioning boss 400 as a transition from a slope to a flat surface can gradually rotate the protrusion 110 of the tool accessory 100 from the slope to the flat surface during the installation of the tool accessory 100, thus ensuring that the tool accessory 100 is stably supported after being installed in place.

[0046] In the present embodiment, the sleeve 300 is a plate-like structure, which can have a certain elasticity. When the sleeve 300 is pressed by the locking protrusion 430, the slot 310 on the sleeve 300 will correspondingly reduce its width. When the sleeve 300 is no longer pressed by the locking protrusion 430, it can automatically rebound due to its inherent elasticity, thus facilitating the insertion of the tool accessory 100 into the slot 310. In addition, in order 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 the extension 320 is used to tightly contact the inner wall of the locking ring 430, which helps to achieve a more stable interference fit. In the present embodiment, the extension 320 is designed in the shape of a trapezoid, and the corners are designed with a round transition. This design not only looks good, but also effectively reduces wear caused by friction during long-term use. Of course, according to different use requirements 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 can also be a cylindrical structure, and the slot 310 is in the shape of a straight line in the radial cross-section of the cylindrical structure. Alternatively, the top of the sleeve 300 can be a plate-like structure, and the bottom can be a cylindrical structure. The sleeve 300 is designed according to the use requirements, which are not limited 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, referring to Figure 2 and Figure 3The insertion slot 421 includes a rectangular slot 421a and two fan-shaped slots 421b arranged on both sides of the rectangular slot 421a respectively. The fan-shaped slots 421b are in communication with the rectangular slot 421a. The tool accessory 100 is inserted into the insertion slot 421 through the rectangular slot 421a. When the recess 120 is directly opposite the bottom 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 slot 421b.

[0049] During the assembly of the tool accessory 100, first, the tool accessory 100 needs to be aligned with the rectangular slot 421a, and then the tool accessory 100 is inserted into the insertion slot 310. When the tool accessory 100 is correctly inserted into the recess 120 and the corresponding position of the bottom plate 420, the locking sleeve 400 can be rotated counterclockwise due to the existence of the fan-shaped slot 421b and the restoring force of the torsion spring 500. Understandably, the position of the fan-shaped slot 421b corresponds to the position of the accessory positioning boss 440, so that when the recess 120 is located in the position of the fan-shaped slot 421b, the convex portion 110 is just above the accessory positioning boss 440.

[0050] Further, the open end of the chuck 200 is provided with an accessory avoiding notch 230 for clamping with the convex portion 110 of the tool accessory 100. When the convex portion 110 is inserted into the accessory avoiding notch 230, the recess 120 and the bottom plate 420 are opposite.

[0051] Optionally, the open end of the chuck 200 is inserted into the locking ring 430 of the locking sleeve 400. The accessory avoiding notch 230 can enable the tool accessory 100 to be inserted into the insertion slot 310, and at the same time, the circumferential limiting of the tool accessory 100 and the chuck 200 is realized, preventing the tool accessory 100 and the chuck 200 from deviating. When the tool accessory 100 needs to be removed, the locking sleeve 400 needs to be rotated so that the rectangular slot 421a on the locking sleeve 400 is opposite to the convex portion 110, which is equivalent to that the rectangular slot 421a is opposite to the accessory avoiding notch 230.

[0052] Referring to Figure 4 The locking wall surface of the locking ring 430 for interference connection with the chuck 300 is a 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 structure design, the side surface of the chuck 300 is in contact with the locking wall surface 431. After the tool accessory 100 is inserted into the clamping assembly, during the counterclockwise rotation of the locking sleeve 400 driven by the torsion spring 500, the chuck 300 is gradually pressed by the locking wall surface 431, that is, the chuck 300 can gradually clamp the tool accessory 100 to prevent the tool accessory 100 from shaking.

[0054] Further, the inner wall of the locking ring 430 is provided with a positioning shoulder 432, which is connected to the side of the locking wall surface 431 closer to the central axis of the locking sleeve 400, and is used to abut against the clamping sleeve 300 to achieve the circumferential positioning of the locking sleeve 400.

[0055] When the locking sleeve 400 is rotated to the position where the positioning shoulder 432 abuts against the clamping sleeve 300, the torsional spring 500 cannot drive the locking sleeve 400 to continue rotating, at this time, the clamping sleeve 300 has been clamped by the locking wall surface 431, and the convex part 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 Fig. 4 schematically shows a partial structure sectional view of the tool accessory clamping assembly according to an embodiment of the present application Figure 1 ; Figure 6 Fig. 4 schematically shows a partial structure sectional view of the tool accessory clamping assembly according to an embodiment of the present application Figure 2 . Referring to Figures 3 to 6 , the tool accessory clamping assembly further comprises a compression spring 600, which is arranged in the open cavity 210, one end of the compression spring 600 abuts against the top of the open cavity 210, and the other end of the compression spring 600 abuts against the clamping sleeve 300.

[0057] It can be understood that the compression spring 600 always exerts a certain force on the clamping sleeve 300, so that the clamping sleeve 300 has a tendency to move towards the bottom plate 420. When installing the tool accessory 100, the tool accessory 100 is inserted into the clamping groove 471 and the clamping sleeve 300 is pushed upwards, the compression spring 600 is extruded and shrinks, when the recess 120 is opposite to the bottom plate 420, the torsional spring 500 drives the locking sleeve 400 to rotate, so that the accessory positioning boss 440 is rotated below the convex part 110 of the tool accessory 100, and the clamping sleeve positioning boss 450 is rotated below the clamping sleeve 300, the clamping sleeve 300 abuts against the clamping sleeve 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, the clamping head 200 is provided with a clamping sleeve avoiding notch 240, when the tool accessory 100 pushes the clamping sleeve 300 to move towards the top of the open cavity 210, the bottom of the clamping sleeve 300 is inserted into the clamping sleeve avoiding notch 240. That is, the clamping sleeve avoiding notch 240 provides space for the axial movement of the clamping sleeve 300, and at the same time, the clamping sleeve 300 avoiding notch 240 achieves the circumferential limiting of the clamping sleeve 300 and the clamping head 200, preventing the relative rotation of the clamping sleeve 300 and the clamping head 200.

[0058] Further, the inner ring of the locking ring 430 is provided with a sleeve positioning boss 450, the end surface of the locking ring 430 is higher than the end surface of the sleeve positioning boss 450, the sleeve positioning boss 450 and the accessory positioning boss 440 are arranged in a spaced manner 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 sleeve positioning boss 450 faces the sleeve 300, the sleeve 300 can abut against the sleeve positioning boss 450 under the restoring force of the compression spring 600, and when the limiting groove 460 faces 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 convex part 110 of the tool accessory 100 abuts against the accessory positioning boss 440, the sleeve 300 just abuts against the sleeve positioning boss 450. After the tool accessory 100 and the locking sleeve 400 are separated, the torsional spring 500 drives the locking sleeve 400 to rotate, when the locking sleeve 400 rotates to the position that the limiting groove 460 faces the sleeve 300, the sleeve 300 is clamped into the limiting groove 460 under the restoring force of the compression spring 600, thereby preventing the restoring force of the torsional spring 500 from continuously driving the locking sleeve 400 to rotate. In addition, in the state that the sleeve 300 is clamped into the limiting groove 460, the rectangular port 421a just faces the sleeve avoiding notch 240 on the chuck 200, thereby when the tool accessory 100 is installed, the tool accessory 100 can be directly inserted without rotating the locking sleeve 400. In the prior art, when the tool accessory 100 is installed, the locking sleeve 400 usually needs to be rotated to insert the tool accessory 100 into the clamping assembly, and the technical solution clamps the sleeve 300 through the limiting groove 460, thereby the step of rotating the locking sleeve 400 is omitted when the tool accessory 100 is installed, and the installation process is more convenient.

[0060] Since the insertion groove 310 is located on the central axis of the sleeve 300, the tool accessory 100 and the sleeve 300 are connected vertically, therefore, the central axis of the limiting groove 460 should be perpendicular to the central axis of the socket 421. In addition, one accessory positioning boss 440 and one sleeve positioning boss 450 are arranged on each side of the central axis of the socket 421, thereby the two sides of the central axis of the sleeve 300 and the two sides of the central axis of the tool accessory 100 can be effectively supported.

[0061] Further, in 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 drives the sleeve 300 to move towards the sleeve positioning boss 450 and abut against the sleeve positioning boss 450.

[0062] The height of the clamping sleeve positioning boss 450 gradually decreases, that is, the height of the locking wall surface 431 gradually increases, so that the clamping sleeve 300 can gradually move downward along the locking ring 430 under the pushing of the compression spring 600, the contact area between the clamping sleeve 300 and the locking wall surface 431 gradually increases, so that the locking ring 430 can exert greater extrusion force on the clamping sleeve 300, thereby making the clamping sleeve 300 better clamp the tool accessory 100. Further, the top of the clamping sleeve 300 is designed to be arc-shaped, so that the top of the clamping sleeve 300 can extend into the inner ring of the compression spring 600, and the inclined edge of the top of the clamping sleeve 300 is in contact with the bottom of the compression spring 600, so that the compression spring 600 can extrude the two sides of the clamping sleeve 300 while pushing the clamping sleeve 300 downward, so that the clamping sleeve 300 better clamps the tool accessory 100.

[0063] Further, the tool accessory clamping assembly further comprises a circlip 700, the outer periphery of the collet 200 is provided with a ring rib 220, the ring rib 220 is located inside the sleeve 410, the inner wall of the sleeve 410 is provided with a ring groove, the circlip 700 is clamped in the ring groove, and the circlip 700 and the ring rib 220 abut away from one side of the open end of the collet 200. The torsion spring 500 is located between the ring rib 220 and the end surface of the locking ring 430.

[0064] The torsion spring 500 is connected to the ring rib 220 through the hole in the ring rib 220. The torsion spring 500 is connected to the locking ring 430 through the hole in the locking ring 430. The torsion spring 500 is connected to the locking ring 430 through the hole in the locking ring 430. The torsion spring 500 is connected to the locking ring 430 through the hole in the locking ring 430.

[0065] In the embodiment, when the clamping assembly is not connected with the tool accessory 100, the rectangular port 421a on the sleeve 400 and the accessory avoiding notch 230 on the collet 200 are opposite, and the bottom of the clamping sleeve 300 is inserted into the limiting groove 460. This initial state provides convenience for 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] Firstly, the tool accessory 100 is inserted into the slot 310 on the collet 300 through the socket 421 on the lock sleeve 400. At this time, the tool accessory 100 will abut against the collet 300 and move towards the top of the open cavity 210. This action causes the compression spring 600 to be compressed, and the contraction force of the compression spring 600 makes the bottom of the collet 300 move away from the limiting groove 460. With the progress of this process, the lock sleeve 400 starts to rotate counterclockwise under the restoring force of the torsion spring 500. The accessory positioning boss 440 is rotated to below the convex part 110 of the tool accessory 100, and the collet positioning boss 450 is rotated to below the collet 300. Under the restoring force of the compression spring 600, the tool accessory 100 and the accessory positioning boss 440 start to abut against each other, and the collet 300 gradually moves down and contacts the collet positioning boss 450. The outside of the extension 320 on the collet 300 is squeezed by the locking ring 430, and the tool accessory 100 is gradually clamped. When the lock sleeve 400 rotates to a certain angle, the bottom of the collet 300 abuts against the side surface of the positioning shoulder 432, at which time the lock sleeve 400 cannot continue to rotate, and the tool accessory 100 is installed in place.

[0067] When it is necessary to remove the tool accessory 100, the operator can rotate the lock sleeve 400 clockwise by hand pressing the actuating part 470, so that the rectangular port 421a of the socket 421 is directly opposite the convex part 110 on the tool accessory 100. At the same time, the limiting groove 460 is also rotated to a position directly opposite the bottom of the collet 300. Under the restoring force of the compression spring 600, the collet 300 moves downward and is inserted into the limiting groove 460. At this time, the tool accessory 100 is pushed out by the collet 300, and then the operator can easily take out the tool accessory 100 from the clamping assembly, completing the unloading process.

[0068] The technical solution also provides an electric tool, characterized in that the electric tool comprises a driving member, a tool accessory 100, and the tool accessory clamping assembly described above, the tool accessory 100 is inserted into the slot 310 through the socket 421, and the driving member is connected with the chuck 200 and used 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 technical solution, when the tool accessory 100 is replaced, the rectangular notch 421a of the lock sleeve 400 is directly opposite the convex part 110 on the tool accessory 100 by rotating the lock sleeve 400 clockwise, the tool accessory 100 is pulled out, and the tool accessory 100 to be replaced is directly inserted through the socket 421 on the lock sleeve 400, so that the tool accessory 100 abuts against the collet 300 until the lock sleeve 400 is automatically rotated under the driving of the torsion spring 500, and the collet 300 falls into the limiting groove 460 under the pushing of the compression spring 600, which is completed.

[0070] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should 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 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), the sleeve (300) has a slot (310), and the tool accessory (100) can be vertically inserted into the sleeve (300) through 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) is rotated 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). The tool accessory clamping assembly also includes a compression spring (600), which is disposed in the opening (210), with one end of the compression spring abutting against the top of the opening (210) and the other end of the compression spring abutting against the clip (300); 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 socket (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).

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, Along the clockwise direction, the height of the sleeve positioning boss (450) gradually decreases. When the lock 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).

5. 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).

6. 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.

7. 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).

8. 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 1-7, 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.

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