A flat chisel angle adjusting and locking structure and electric tool

Abstract

The application discloses a flat chisel angle adjusting and locking structure and electric tools, which comprises a shell, a lock sleeve, a locking part and a rotating sleeve. The rotating sleeve is used for connecting a flat chisel and is rotationally connected with the shell. A through hole extending radially is arranged on the circumference of the rotating sleeve. The lock sleeve is fixed on the circumference of the rotating sleeve and is axially slidably connected. The locking part is accommodated in an installation space defined by the through hole and the rotating sleeve. The end of the shell towards the lock sleeve is provided with a first locking part. The flat chisel angle adjusting and locking structure further comprises an adjusting sleeve fixed on the circumference of the lock sleeve and axially slidably connected. An elastic part is connected between the lock sleeve and the adjusting sleeve. The lock sleeve can axially slide along the rotating sleeve to drive the locking part to lock or release the flat chisel. The flat chisel angle adjusting and locking structure and the electric tools integrate the angle adjusting and the tool locking function, and realize the angle setting which is simple, fast, safe and reliable.

Description

Technical Field

[0001] This application relates to the field of power tool technology, and more specifically, to a chisel angle adjustment and locking structure and a power tool. Background Technology

[0002] In actual construction, traditional flat chisels (such as those used by electric hammers and electric chisels) often require adjustments to the chiseling angle based on the working surface and construction requirements.

[0003] In existing technologies, the angle adjustment and locking functions of a chisel are usually independent: the user must first manually operate a separate locking mechanism (such as rotating the locking nut, moving the locking wrench, etc.) to release the clamp on the chisel, then rotate the chisel to the desired angle, and finally re-operate the locking mechanism to fix it. This method has obvious shortcomings: the operation steps are cumbersome and the adjustment efficiency is low; in a loose state, the chisel is prone to angle deviation due to equipment vibration or accidental contact, making it difficult to guarantee adjustment accuracy; if the re-locking force is insufficient, the chisel may slip or loosen during high-intensity impact operations, posing a safety hazard.

[0004] Although some designs attempt to simplify operation, they often compromise on aspects such as locking reliability, structural compactness, or ease of adjustment, making it difficult to achieve fast, accurate, and safe one-handed adjustment while ensuring locking force. Utility Model Content

[0005] In view of this, this application provides a flat chisel angle adjustment and locking structure and power tool, which integrates angle adjustment and tool locking functions into one unit, realizing simple, quick and safe angle adjustment and locking.

[0006] In a first aspect, this application provides a flat chisel angle adjustment and locking structure, including a housing, a locking sleeve, a locking member, and a rotating sleeve. The rotating sleeve is used to connect and fix the flat chisel and is rotatably connected to the housing. It has a radially extending through hole in its circumference. The locking sleeve is circumferentially fixed and axially slidably connected to the rotating sleeve. The locking member is accommodated within an installation space jointly defined by the through hole and the rotating sleeve. The end of the housing facing the locking sleeve has a first locking part. The flat chisel angle adjustment and locking structure further includes: The adjusting sleeve is circumferentially fixed and axially slidably connected to the locking sleeve. The end of the adjusting sleeve away from the locking sleeve is provided with a second locking part. The second locking part and the first locking part can achieve multi-angle engagement in the circumferential direction. When the first locking part and the second locking part are engaged, the adjusting sleeve is circumferentially fixed to the outer shell. An elastic element is connected between the locking sleeve and the adjusting sleeve; The locking sleeve can slide along the axial direction of the rotating sleeve to drive the locking member to lock or release the flat chisel. When the flat chisel is in the locked state, the adjusting sleeve can slide axially away from the outer shell to disengage the first locking part from the second locking part. At this time, the adjusting sleeve can drive the rotating sleeve to rotate through the locking sleeve.

[0007] By adopting the above technical solution, the angle adjustment and chisel locking functions are integrated into one unit through the coordinated design of the adjusting sleeve, locking sleeve, elastic element, and locking part. With the chisel reliably locked, the user only needs to pull the adjusting sleeve axially once to release the angle lock, and directly rotate the adjusting sleeve to adjust the chisel angle. After release, it automatically resets and locks, greatly simplifying the operation process and achieving fast, accurate, and safe one-handed operation.

[0008] In some embodiments, the first locking part and the second locking part are interlocking toothed structures.

[0009] By adopting the above technical solution, circumferential multi-angle positioning is achieved by using the intermeshing tooth structure. This not only provides a clear and stable gear feel and prevents the angle from shifting on its own during impact operations, but also has a large meshing surface and strong load-bearing capacity, ensuring the overall structural rigidity and reliability after the angle is locked.

[0010] In some embodiments, the tooth structure is a straight or helical tooth uniformly distributed along the circumference.

[0011] By adopting the above technical solution and using a tooth profile that is evenly distributed in the circumference, the angle adjustment is divided into equal scales, which makes it convenient for users to accurately control the rotation angle; the introduction of helical teeth can increase the axial force during meshing, making the locking part more tightly engaged in a vibration environment and providing better anti-loosening effect.

[0012] In some embodiments, the elastic element is a compression spring, with its two ends elastically abutting against the locking sleeve and the adjusting sleeve respectively, and in a pre-compressed state, thereby simultaneously providing the adjusting sleeve with a tendency to move toward the outer shell to engage the first and second locking parts, and providing the locking sleeve with a tendency to compress the locking element toward the axial direction of the rotating sleeve.

[0013] By adopting the above technical solution, the pre-compression state of a single compression spring is cleverly designed to provide elastic force in two directions simultaneously: one force drives the adjusting sleeve to reset to achieve angle locking, and the other force continuously forces the locking sleeve to squeeze the locking element to maintain clamping on the flat chisel. This "one spring, two uses" design simplifies the structure, reduces the number of parts and cost, and ensures automatic linkage and high synchronization of locking and clamping actions.

[0014] In some implementations, the locking element is a ball or a lug.

[0015] By adopting the above technical solution, using balls or protrusions as locking components, the contact between them and the flat chisel shaft or groove is point contact or line contact, which can generate a large radial locking force under a small axial driving force, resulting in high locking efficiency; at the same time, the ball structure has low frictional resistance, which facilitates the insertion and removal of the flat chisel, and has good wear resistance and long service life.

[0016] In some implementations, the adjusting sleeve and the locking sleeve achieve circumferential fixation and axial sliding connection through the cooperation of the guide groove and the protrusion disposed between them.

[0017] By adopting the above technical solution, the cooperation between the guide groove and the protrusion ensures that the adjusting sleeve and the locking sleeve rotate synchronously to achieve angle linkage adjustment, while allowing the necessary axial relative displacement between the two, providing precise guidance for the disengagement and engagement of the locking part. The structure is simple and the operation is stable.

[0018] In some embodiments, the adjusting sleeve or locking sleeve is provided with an annular groove for accommodating the elastic element.

[0019] By adopting the above technical solution, the annular groove provides a stable and regular installation and limiting space for the elastic component, preventing it from tilting or falling off during use, ensuring the accuracy and reliability of the elastic force transmission, and also making the internal structure more compact, which is conducive to overall assembly.

[0020] In some implementations, the lock sleeve is embedded with a nest, and the lock sleeve is slidably connected to the rotating sleeve through the nest. When the nest abuts against the locking member, the flat chisel is in a locked state.

[0021] By adopting the above technical solution, the nested part is set as a wear-resistant component between the locking sleeve and the rotating sleeve, and the axial movement of the locking sleeve is converted into radial compression of the locking component. This effectively reduces the direct wear between the locking sleeve and the rotating sleeve, improves the service life of the main structural components, and the nested part is easy to replace, resulting in low maintenance costs. This structure, with the locking sleeve made of plastic and the nested part made of metal as an insert, is injection molded integrally with the locking sleeve, offering advantages such as low cost, high reliability, and light weight.

[0022] In some implementations, the inner circumferential surface of the lock sleeve is provided with a relief groove, which is connected to the nest. When the lock sleeve slides axially, the sidewall of the relief groove or the nest drives the locking member to move, so as to lock or release the flat chisel.

[0023] By adopting the above technical solution, the combination of the annular groove and the nesting forms a variable space structure that drives the radial movement of the locking element. When the locking sleeve slides, the locking element is pressed or released by changing the radial dimension of this space. This structure efficiently converts axial linear motion into radial locking action, with direct transmission, rapid response, and controllable locking force.

[0024] Secondly, this application provides an electric tool including the chisel angle adjustment and locking structure of the first aspect.

[0025] By adopting the above technical solution, the chisel angle adjustment and locking structure of this application is applied to power tools (such as electric hammers and electric picks), which significantly improves the ease of operation and work efficiency of the tools. Users can quickly and safely adjust the chisel angle without stopping the machine or using other tools, thereby enhancing the overall performance and market competitiveness of power tools.

[0026] In summary, this application has at least one of the following beneficial technical effects: 1. It achieves a high degree of integration between angle adjustment and tool locking, and simplifies the operation process to the extreme. Users can complete the entire process of angle unlocking, adjustment and relocking by pulling and rotating the adjustment sleeve in a single continuous action, while ensuring that the chisel is always clamped. The operation is convenient, efficient and safe.

[0027] 2. The structural design is highly collaborative. The clever layout of elastic elements achieves "one force for two drives", which simultaneously controls the two functions of angle locking and flat chisel locking. The structure is compact, with fewer parts, high reliability, and reduced manufacturing and maintenance costs.

[0028] 3. It provides stable and precise multi-angle positioning and reliable anti-loosening locking. The toothed locking part ensures the accuracy of angle fixation and impact resistance, while the radial compression locking mechanism can maintain a firm grip on the chisel in a vibrating environment, effectively improving the accuracy and safety of operation.

[0029] 4. Modular and wear-resistant design enhances product lifespan and maintainability. The use of wear-resistant components such as nested parts protects the core transmission components, while guiding and accommodating details facilitate assembly and maintenance, resulting in excellent practicality and economy. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the flat chisel angle adjustment and locking structure of this application; Figure 2 This is an exploded structural diagram of the chisel angle adjustment and locking structure of this application; Figure 3 This is a schematic diagram of another angle of the chisel angle adjustment and locking structure decomposition structure in this application; Figure 4 This is a cross-sectional schematic diagram of the chisel angle adjustment and locking structure of this application; Figure 5 yes Figure 4 Enlarged diagram of area A in the middle; Figure 6 This is a diagram illustrating a nested structure; Figure 7This is a schematic diagram of the lock sleeve structure; Figure 8 This is a schematic diagram of the structure of the power tool of this application; Figure 9 This is an exploded structural diagram of the power tool of this application.

[0031] Explanation of reference numerals in the attached drawings: 1. Front cover; 2. Locking sleeve; 21. Nesting; 211. Raised key; 22. Protrusion; 23. Ring groove; 24. Clearance groove; 3. Adjusting sleeve; 31. Guide groove; 32. Straight tooth; 4. Outer shell; 41. Tooth groove; 5. Spring; 6. Rotating sleeve; 61. Through hole; 62. Keyway; 63. Mounting hole; 7. Protrusion; 8. Main body; 81. Handle. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the utility model will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of this utility model described and shown in the accompanying drawings can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0036] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Unless otherwise specified, the features in the following embodiments can be combined with each other.

[0037] Example 1: Please see Figures 1-7 This application provides a chisel angle adjustment and locking structure, aiming to solve the problems of large space occupation and long transmission chain of independent clutches in traditional power tools. The following is a detailed description of this solution with reference to specific embodiments.

[0038] Please see Figures 1 to 3 This embodiment provides a flat chisel angle adjustment and locking structure, which aims to achieve rapid and reliable adjustment and locking of the flat chisel angle. The flat chisel angle adjustment and locking structure mainly includes a housing 4, a rotating sleeve 6, a locking sleeve 2, an adjusting sleeve 3, a locking element, and an elastic element.

[0039] The outer casing 4, serving as the basic support and mounting carrier of the entire structure, is a cylindrical structure, with one end used to connect to the main body 8 of a power tool (such as an electric hammer). A first locking part is machined or fixed to the inner edge of the end of the outer casing 4 facing the locking sleeve 2. In this embodiment, the first locking part is preferably a toothed groove 41, with the tooth shape being either straight teeth 32 or helical teeth at a certain angle. The helical tooth design helps to provide better anti-loosening effect in a vibration environment.

[0040] The rotating sleeve 6 is rotatably disposed within the housing 4, and is typically connected to the housing 4 by a bearing or bushing structure. One end of the rotating sleeve 6 is used to connect to a flat chisel (not shown in the figure), and the connection is made by quick clamping through the engagement of the locking sleeve 2 and the locking member. At least one radially extending through hole 61 is provided on the circumferential wall surface of the rotating sleeve 6. This through hole 61 penetrates the wall thickness of the rotating sleeve 6, providing a channel for the radial movement of the locking member.

[0041] The locking sleeve 2 is fitted onto the outside of the rotating sleeve 6 and is circumferentially fixed to the rotating sleeve 6. This circumferential fixation can be achieved in various ways. In this embodiment, a keyway 62 is provided on the outer wall of the rotating sleeve 6, and a convex key 211 that mates with it is provided on the inner wall of the locking sleeve 2 (or vice versa), thereby fixing the locking sleeve 2 and the rotating sleeve 6 circumferentially and achieving synchronous rotation. At the same time, the locking sleeve 2 and the rotating sleeve 6 form an axial sliding connection, that is, the convex key 211 slides within the keyway 62, allowing the locking sleeve 2 to slide back and forth within a certain range along the axial direction of the rotating sleeve 6. An annular groove 23 is formed at the end of the locking sleeve 2 to accommodate one end of the spring 5, for positioning and placing the spring 5.

[0042] The adjusting sleeve 3 is fitted over the locking sleeve 2 and is circumferentially fixed and axially slidably connected to the locking sleeve 2. Specifically, an axially extending guide groove 31 can be provided on the inner wall of the adjusting sleeve 3, while a corresponding protrusion 22 (or guide key) is provided on the outer wall of the locking sleeve 2, so that the adjusting sleeve 3 and the locking sleeve 2 can only rotate together, but the adjusting sleeve 3 can slide axially relative to the locking sleeve 2. A second locking part is provided on the end face of the adjusting sleeve 3 away from the locking sleeve 2 (i.e., the end near the outer shell 4). This second locking part corresponds to the first locking part on the outer shell 4, and in this embodiment, it is also a toothed structure (outer toothed ring), the number of teeth and the tooth shape of which match the first locking part, so that the two can mesh with each other at multiple discrete angular positions to achieve circumferential fixation. In this embodiment, a toothed groove 41 is provided on the end face of the outer shell 4, and a corresponding straight tooth 32 is provided on the adjusting sleeve 3. The outer periphery of the adjusting sleeve 3 is usually provided with anti-slip texture, knurling or flange to facilitate user gripping and force application.

[0043] Spring 5 connects the locking sleeve 2 and the adjusting sleeve 3. Preferably, a compression spring is used as the elastic element. The two ends of the spring 5 elastically abut against the annular groove 23 at the end of the locking sleeve 2 and the corresponding shoulder on the inner wall of the adjusting sleeve 3, respectively. In its natural state after assembly, the compression spring is in a pre-compressed state. This design causes the spring 5 to generate two forces simultaneously: first, it pushes the adjusting sleeve 3 toward the outer shell 4, so that the straight teeth 32 on the adjusting sleeve 3 tend to engage with the toothed grooves 41 on the outer shell 4; second, it pushes the locking sleeve 2 toward the front end, so that the locking sleeve 2 (through the nest 21) tends to continuously compress the locking element, thereby maintaining the clamping force on the flat chisel.

[0044] Please see Figure 4 and Figure 5 The locking element is disposed within the mounting space formed by the through hole 61 of the rotating sleeve 6 and the inner hole of the rotating sleeve 6. In this embodiment, the locking element is a cylindrical protrusion 7, the diameter or length of which is slightly larger than the outline dimension of the through hole 61 located on the inner wall of the mounting hole 63 of the rotating sleeve 6, so that the protrusion 7 can only partially enter the inner hole of the rotating sleeve 6, and not fully enter. When subjected to radial inward pressure, the protrusion 7 can partially protrude from the mounting hole 63 of the rotating sleeve 6, for engaging with the fixing groove on the flat chisel rod inserted therein, thereby locking the flat chisel and preventing its axial movement and circumferential rotation. In other embodiments, the locking element may also be a ball bearing or other shaped wear-resistant block.

[0045] Please see Figures 5-7The nest 21 is a ring-shaped or segmented component made of wear-resistant material. It can be integrally injection molded into the plastic body of the lock sleeve 2 as an insert, or connected by means of snap-fit, interference fit, etc. In this embodiment, the nest 21 is made of metal. The inner diameter of the nest 21 slides with the outer diameter of the rotating sleeve 6, so that the lock sleeve 2 slides relative to the rotating sleeve 6 through the nest 21, reducing the direct wear between the lock sleeve 2 and the rotating sleeve 6 and improving the service life. The inner wall surface of the nest 21 forms a driving surface. When the lock sleeve 2 moves axially, the nest 21 moves accordingly and acts on the protrusion 7, causing the locking element to move radially to lock the flat chisel. When the lock sleeve 2 slides to the point where the protrusion 7 corresponds to the relief groove 24, the flat chisel moves to push the protrusion 7 into the relief groove 24, so that the flat chisel can freely enter and exit the mounting hole 63. The protruding key 211 is provided on the nest 21 to maintain good strength and wear resistance.

[0046] Based on the above structure, its working process is as follows: Normal locking state: During non-adjustment periods, due to the pre-compressed spring 5, the adjusting sleeve 3 is pushed towards the outer shell 4, and its straight teeth 32 tightly mesh with the tooth groove 41 of the outer shell 4, locking the adjusting sleeve 3 circumferentially to the outer shell 4, thus fixing the angle of the flat chisel. Simultaneously, the force of the spring 5 on the locking sleeve 2 causes the nest 21 to continuously press the protrusion 7 inward. The protrusion 7 protrudes radially inward and engages with the fixing groove of the flat chisel shaft, firmly locking the flat chisel and preventing it from rotating or moving axially during operation. In this state, the structure simultaneously achieves angle locking and tool locking.

[0047] Preparation for Adjustment (Unlocking): When adjusting the chisel angle, the user holds the non-slip part of the outer circumference of the adjusting sleeve 3 and pulls the adjusting sleeve 3 axially away from the outer shell 4, overcoming part of the elastic force of the spring 5. The adjusting sleeve 3 slides relative to the locking sleeve 2, causing the straight teeth 32 at its end to disengage from the tooth groove 41 of the outer shell 4, thus releasing the angle lock. During this process, due to the axial sliding connection design between the adjusting sleeve 3 and the locking sleeve 2, the position of the locking sleeve 2 remains basically unchanged in the initial stage. Therefore, the protrusion 7 remains in a pressing and locking state on the chisel, and the chisel does not loosen, ensuring safety in the initial stage of adjustment.

[0048] Angle Adjustment: With the adjusting sleeve 3 pulled, since the adjusting sleeve 3 and the locking sleeve 2 are circumferentially fixed, when the user rotates the adjusting sleeve 3, the locking sleeve 2 will rotate along with it through the cooperation of the protrusion 22 and the guide groove 31. The locking sleeve 2, in turn, drives the rotating sleeve 6 and the flat chisel mounted on it to rotate together through the keyway 62. The user can rotate the flat chisel to the desired working angle. Angle scales (not shown) can be set on the outer shell 4 or the rotating sleeve 6 for easy and precise alignment.

[0049] Release and Automatic Locking: Once the angle is adjusted to the correct position, the user releases the adjusting sleeve 3. Under the restoring force of the spring 5, the adjusting sleeve 3 is first quickly pushed towards the outer shell 4, and its straight teeth 32 re-engage with the toothed grooves 41 of the outer shell 4 at the new angle position, achieving instantaneous angle locking. Secondly, the elastic element pushes the locking sleeve 2, allowing the radial compressive force of the nest 21 on the protrusion 7 to be maintained or finely adjusted, ensuring that the flat chisel remains reliably clamped at the new angle. The entire "unlock-adjust-lock" process is smooth and quick, and the flat chisel remains clamped at all times, ensuring safety and reliability.

[0050] Example 2: Please see Figure 8 and Figure 9 This embodiment applies the chisel angle adjustment and locking structure described in Embodiment 1 to a handheld power tool (such as an electric hammer or electric pick) to demonstrate its integration method and operational advantages in a real product.

[0051] like Figure 8 and Figure 9 As shown, the power tool includes a main body 8, a chisel angle adjustment and locking structure as described in Embodiment 1 located at the front end, and a handle 81 connected to the main body. The main body 8, as the main housing of the tool head assembly, is fixedly connected to the outer shell 4, and the front end of the rotating sleeve 6 is fixedly connected to the front cover 1 for mounting the chisel.

[0052] In this embodiment, the anti-slip flange portion of the adjusting sleeve 3 is exposed to the outside, facilitating user operation with bare hands. The flange surface has a distinct anti-slip rubber coating or deep knurling, providing good grip even when wearing gloves or in oily environments.

[0053] Based on the above diagrams, the assembly and usage process is as follows: Install the flat chisel: Insert the tail rod of the flat chisel into the chuck at the front end of the rotating sleeve 6 until it is in place, aligning the fixing groove on the flat chisel rod with the through hole 61 on the rotating sleeve 6. During insertion, the protrusion 7 is pushed outward by the flat chisel rod, compressing the nest 21 and the locking sleeve 2 and moving them slightly backward. When the groove aligns with the protrusion 7, the protrusion 7 automatically engages with the groove under the action of the elastic element, accompanied by a slight "click" sound, indicating that the flat chisel has been initially locked.

[0054] Angle preset: Users can preset the chisel angle before starting work as needed. The operation method is exactly as described in Example 1: pull the flange of the adjusting sleeve 3 outward, rotate it to the desired angle (this can be achieved by observing the alignment of the fixed scale line on the outer shell 4 with the indicator mark on the adjusting sleeve 3), and then release to complete the angle setting and locking. Since the chisel remains clamped during the adjustment process, there is no need to worry about it falling off.

[0055] Quick adjustment during operation: In actual chiseling operations, if it is necessary to change the chiseling direction or adapt to different working surfaces, the user does not need to stop the machine or use other tools. He / she can operate directly with one hand: pull the adjustment sleeve 3, rotate to the new angle, and release. The whole process can be completed in a few seconds, which greatly improves work efficiency and flexibility.

[0056] Reliability: Integrated into the front end of the power tool's impact mechanism, this structure effectively resists high-frequency vibrations generated during operation. The engagement of the toothed locking part provides strong circumferential torsional resistance, ensuring that the angle will not change due to vibration; while continuous elastic preload ensures that the locking part always fits tightly against the flat chisel groove, preventing the flat chisel from loosening or slipping under impact.

[0057] As can be seen from the application demonstration of this embodiment, the chisel angle adjustment and locking structure of this application can be integrated into existing power tools, giving them convenient, safe and efficient angle adjustment functions, and significantly improving the overall performance and user experience of power tools.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments; the embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes, modifications, substitutions, and variations can be made to this utility model without departing from its spirit and scope, and all such changes, modifications, substitutions, and variations fall within the scope of the claimed utility model.

Claims

1. A flat chisel angle adjustment and locking structure, comprising a housing, a locking sleeve, a locking member, and a rotating sleeve, wherein the rotating sleeve is used to connect and fix the flat chisel and is rotatably connected to the housing, and has a radially extending through hole in its circumference; the locking sleeve is circumferentially fixed to the rotating sleeve and axially slidably connected; and the locking member is accommodated within an installation space jointly defined by the through hole and the rotating sleeve; characterized in that, The outer casing has a first locking part at the end facing the locking sleeve, and the flat chisel angle adjustment and locking structure further includes: The adjusting sleeve is circumferentially fixed and axially slidably connected to the locking sleeve. The end of the adjusting sleeve away from the locking sleeve is provided with a second locking part. The second locking part and the first locking part can achieve multi-angle engagement in the circumferential direction. When the first locking part and the second locking part are engaged, the adjusting sleeve is circumferentially fixed to the outer shell. An elastic element is connected between the locking sleeve and the adjusting sleeve; The locking sleeve can slide along the axial direction of the rotating sleeve to drive the locking member to lock or release the flat chisel. When the flat chisel is in the locked state, the adjusting sleeve can slide axially away from the outer shell to disengage the first locking part from the second locking part. At this time, the adjusting sleeve can drive the rotating sleeve to rotate through the locking sleeve.

2. The flat chisel angle adjustment and locking structure according to claim 1, characterized in that, The first locking part and the second locking part are interlocking tooth-shaped structures.

3. The flat chisel angle adjustment and locking structure according to claim 2, characterized in that, The tooth structure consists of straight or helical teeth evenly distributed circumferentially.

4. The flat chisel angle adjustment and locking structure according to claim 1, characterized in that, The elastic element is a compression spring, with its two ends elastically abutting against the locking sleeve and the adjusting sleeve respectively, and is in a pre-compressed state. This provides the adjusting sleeve with a tendency to move toward the outer shell to engage the first and second locking parts, and provides the locking sleeve with a tendency to press the locking element toward the axis of the rotating sleeve.

5. The flat chisel angle adjustment and locking structure according to claim 1, characterized in that, The locking element is a ball bearing or a protrusion.

6. The flat chisel angle adjustment and locking structure according to claim 1, characterized in that, The adjusting sleeve and the locking sleeve achieve circumferential fixation and axial sliding connection through the cooperation of the guide groove and the protrusion set between them.

7. The flat chisel angle adjustment and locking structure according to claim 1, characterized in that, The adjusting sleeve or locking sleeve is provided with an annular groove for accommodating the elastic element.

8. The flat chisel angle adjustment and locking structure according to claim 1, characterized in that, The lock sleeve is embedded with a nest, and the lock sleeve is slidably connected to the rotating sleeve through the nest. When the nest abuts against the locking member, the flat chisel is in a locked state.

9. The flat chisel angle adjustment and locking structure according to claim 1, characterized in that, The inner circumferential surface of the lock sleeve is provided with a relief groove, which is connected to the nest. When the lock sleeve slides axially, the side wall of the relief groove or the nest drives the locking member to move, so as to lock or release the flat chisel.

10. A power tool, characterized in that, Includes the chisel angle adjustment and locking structure as described in any one of claims 1-9.

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