Locking structure for screwdrivers and screwdrivers

Abstract

A locking structure for screwdrivers, characterized by the fact that it includes: a main body; a spindle rotatably connected to the main body, the spindle having a tool-holding device at an end opposite the main body and a locking assembly connected to the spindle; an actuating arrangement fitted over the outer periphery of the spindle and slidably connected to the spindle, the actuating arrangement comprising a detachably connected drive bushing and a fixed bushing; the actuating arrangement having a locked state and an unlocked state; wherein, in the locked state, the actuating arrangement is connected to the locking assembly to limit a tool connected to the tool-holding device; and In the unlocked state, the locking assembly removes the limitation of the tool connected to the tool holding device; wherein the locking assembly comprises at least two balls.

Description

Technical area

[0001] The present utility model application relates to the field of maintenance tools and, in particular, to a locking structure for screw drivers and screwdrivers. State of the art

[0002] In today's maintenance and production fields, wrenches and screw drivers, as important components of hand tools, are widely used in various fastening and disassembly work. However, traditional impact drivers and impact wrenches typically use a uniform clamping structure, each of which can only accommodate specific sizes of hex screw shafts or sockets. This severely limits the flexibility and applicability of the tools. For example, impact drivers can typically only clamp 6.35 mm hex screw shafts, while impact wrenches are limited to 12.7 mm sockets. This limitation is particularly evident in complex maintenance and production scenarios where frequent tool changes are required, reducing work efficiency.

[0003] To overcome this problem, tools with an integrated driver and wrench structure have emerged. These tools can clamp both 6.35 mm hex driver handles and 12.7 mm socket wrenches through the design of the operating components, thus achieving multifunctional clamping capability. However, current designs exhibit significant wear when locking driver handles of different specifications, and the cost is relatively high. Contents of this application

[0004] In view of the background, the purpose of the present utility model is to provide a locking structure for screw drivers that enables more convenient assembly and disassembly, thereby reducing the production cost of the product.

[0005] To achieve the above-mentioned purpose, the present application provides, in one aspect, a locking structure for screw drivers, comprising: a main body; a spindle rotatably connected to the main body, the end of the spindle remote from the main body being provided with a tool holder, and a locking assembly connected to the spindle; An actuating assembly that fits over the outer periphery of the spindle and is slidably connected to the spindle. The actuating assembly includes a removable drive bushing and a fixed bushing. The actuating assembly has a locked state and an unlocked state. In the locked state, the actuating assembly is connected to the locking assembly to restrict the tool connected to the tool holder. In the unlocked state, the locking assembly releases the restriction of the tool connected to the tool holder.

[0006] The locking assembly includes at least two balls.

[0007] In the prior art, when locking the screw driver with the bit, there is significant friction when the locking assembly contacts the bit. Over time, this wear affects the reliability of the bit locking. In the present application, the main body of the screw driver serves as the support and foundation of the entire structure. The spindle is rotatably connected to the main body and achieves the basic function of rotational movement. The end of the spindle remote from the main body is equipped with a tool holder device, which allows the screw driver to conveniently connect and change various types of tool heads, thereby increasing the versatility and flexibility of the tool. The use of at least two balls to contact and lock the bit simplifies the structure and improves the reliability and stability of the locking mechanism.When subjected to appropriate pressure, the balls can fit tightly into the tool holder or the tool itself, achieving a firm locking effect and preventing the tool from loosening or falling off during use. When locked, the two balls are located within the bit's limiting groove and do not move radially relative to the spindle, effectively locking the bit and preventing it from detaching from the spindle. When locked, the two balls can rotate under operating force, thereby balancing impact forces during operation and significantly reducing wear on the balls and bits caused by direct impact. Additionally, the balls can be standard components, ensuring stable quality, convenient after-sales maintenance, and low cost.

[0008] A further improvement of the first aspect is that the tool holder device has a polygonal recess arranged at an end of the spindle remote from the main body for receiving a bit.

[0009] A further improvement of the first aspect is that the tool receiving device also includes a polygonal projection disposed at an end of the spindle remote from the main body for receiving a socket wrench.

[0010] The tool holder is capable of accommodating both bits and sockets, further increasing the functionality and practicality of the screw driver.

[0011] A further improvement of the first aspect is that a sliding groove connecting the polygonal recess and the outer periphery of the spindle is arranged radially on the spindle and the at least two balls are arranged partially within the sliding groove.

[0012] The ball portions located within the sliding groove are capable of relative rotation within the groove. When the actuator assembly is in the locked state, the actuator assembly drives the balls to move into the polygonal recess, causing the balls to firmly contact the bit and achieving dynamic locking. This design allows for fine adjustment of the balls to the actual size and shape of the bit, resulting in a more precise locking effect. When unlocking and changing the bit is necessary, the user can perform appropriate operations on the actuator assembly (such as pressing a button or turning a handle) to release the pressure on the balls, causing the balls to move inward or outward within the sliding groove and releasing the bit's locking.This unlocking method is simple and quick, requires no additional tools, and improves work efficiency. The movement or rotation of the balls within the sliding groove reduces direct friction with the spindle or other components, thereby reducing the risk of wear and damage. Furthermore, the balls are typically made of wear-resistant materials that can withstand prolonged use and frequent locking / unlocking operations. The dynamic locking mechanism ensures that the bit does not become loose or dislodge during rotation, thus preventing safety accidents. The close contact between the balls and the bit provides reliable locking force and maintains stability even during high-speed rotation or under significant load.

[0013] In a further improvement of the first aspect, the axes of rotation of the polygonal recess and the polygonal projection coincide.

[0014] Thanks to the aforementioned technical solution, the alignment of the rotation axes of the polygonal recess and the polygonal projection ensures that the rotational movement of the tool head on the spindle is stable and smooth. This eliminates the risk of axis misalignment or tilting, thereby reducing vibration and noise and improving work efficiency and precision. The design of the aligned rotation axes enables more effective transmission of torque (i.e., rotational force) from the spindle to the tool head, which is especially important for applications with high torque requirements. By reducing wear caused by loosening or vibration, this design also contributes to extending the service life of the spindle, polygonal recess, and tool head, thereby reducing maintenance and replacement frequency and lowering operating costs.Users can more easily mount tool heads on the spindle during use and ensure their correct alignment. This simplicity increases work efficiency and reduces the risk of damage due to improper operation.

[0015] In a further improvement of the first aspect, a device is arranged on the spindle on the side opposite the fixed sleeve and remote from the main body, and a first elastic member is arranged between the fixed sleeve and the device.

[0016] Through the aforementioned technical solution, the first elastic member (such as a spring) provides a certain preload force between the fixed sleeve and the device. This preload force helps maintain the stable position of the actuating assembly (including the drive bushing and the fixed sleeve) on the spindle and prevents it from loosening due to vibration or shock during operation. Furthermore, the preload force assists in firmly locking the balls against the tool within the polygonal recess, thereby increasing the reliability of the locking mechanism. When the user actuates the actuating assembly to switch between the locked and unlocked states, the first elastic member generates a corresponding reaction force.This operational feedback assists the user in perceiving changes in the locking state and ensures the accuracy and effectiveness of the operation. During operation, the screw driver may be subjected to reactive forces from the tool head or the work surface. The presence of the first elastic member provides a degree of buffering and shock absorption, reducing the impact and damage of these reactive forces on the spindle and the locking structure. The first elastic member also enables the automatic return function of the actuating assembly. This means that when the user releases the actuating force on the actuating assembly, the elastic member urges the fixed sleeve back to its original position, thus returning the actuating assembly to the locked or unlocked state.This automatic reset function improves user-friendliness and efficiency of use.

[0017] A further improvement of the first aspect is that the drive bushing is also connected to a male part. The male part is connected to the ball among the at least two balls that is remote from the central axis of the spindle.

[0018] A further improvement of the first aspect is that the insert part is equipped with a first contact surface and a second contact surface. The distance of the second contact surface from the central axis of the spindle is greater than the distance of the first contact surface from the central axis of the spindle.

[0019] A further improvement of the first aspect is that, in the locked state, the first contact surface contacts the ball among the at least two balls that is remote from the central axis of the spindle, whereby the ball adjacent to the central axis of the spindle partially enters the polygonal recess. In the unlocked state, the plug-in part slides relative to the spindle until the second contact surface aligns with the sliding groove, whereby the ball adjacent to the central axis of the spindle can fully enter the sliding groove.

[0020] With the aforementioned technical solution, the insert is equipped with a first contact surface and a second contact surface, with the second contact surface being farther from the central axis of the spindle than the first contact surface. This design allows the insert to interact with the balls or the sliding groove via different contact surfaces during sliding, thereby achieving the locked or unlocked state. In the locked state, the first contact surface contacts the ball farther from the central axis of the spindle. Due to the fixed position and the applied force of the insert, this ball is pressed into the polygonal recess, partially pushing the other balls (especially the ball adjacent to the central axis of the spindle) into the polygonal recess. This tight coupling between the balls and the polygonal recess achieves the locking of the tool head.When unlocking is required, the user operates the actuating assembly to slide relative to the spindle. As the drive sleeve slides, the male part also moves until the second contact surface aligns with the sliding groove. At this point, the ball distant from the central axis of the spindle is pushed by the tool head into the space enclosed by the second contact surface of the male part, changing its position and no longer exerting sufficient force on the ball adjacent to the central axis of the spindle. Consequently, the ball adjacent to the central axis of the spindle can fully enter the sliding groove, releasing the locking of the tool head within the polygonal recess.

[0021] In a second aspect, the present application provides a screw driver comprising the locking structure of the first aspect.

[0022] In summary, this application has at least one of the following advantages: 1. The locking structure of the screw driver used in this application is simple. In the locked state, the actuator assembly is connected to the locking assembly, which restricts the tool connected to the tool holder through the action of the actuator assembly. This ensures that the tool does not come loose during rotation. In the unlocked state, the locking assembly releases the tool restriction, allowing the user to easily change or remove the tool. This mechanism design ensures the safety of tool use while improving work efficiency. Locking and unlocking are convenient and quick, reducing the difficulty of assembly and disassembly. 2. The locking structure of the screw driver of the present application can improve on-site operational efficiency and user-friendliness. 3. The locking structure of the screw driver of the present application uses a structure with at least two balls for locking and unlocking, which provides reliable functionality, minimal wear and extended service life. 4. The locking structure of the screw driver of the present application increases the product life and operational convenience, thereby improving the user experience and acceptance.

[0023] With this configuration, simply moving the locking assembly radially along the spindle with a non-rotating tool allows the bit to be unlocked and tightened. The entire device is quick and easy to assemble and disassemble, and production costs are low. Short description of the drawing

[0024] To clarify the technical solutions used in the embodiments of the present utility model application or known from the prior art, a brief introduction to the drawings required for describing the embodiments or the prior art follows below. It should be understood that the drawings described below represent only some embodiments of the present utility model application, and that those skilled in the art can derive further drawings from the given figures without inventive step. Fig. 1 is a schematic diagram of a locking structure for screw drivers according to a first embodiment of the present application; Fig. 2 is a schematic diagram showing the locking structure assembled with a screw driver according to the first embodiment of the present application; Fig. 3 is a schematic diagram showing the socket-mounted locking structure according to the first embodiment of the present application; Fig. 4 is a schematic exploded view of the locking structure for screw drivers according to a first embodiment of the present application; Fig. 5 is a schematic diagram of the fixed sleeve of the locking structure for screw drivers according to a first embodiment of the present application; Fig. 6 is a schematic diagram of the drive socket of the locking structure for screw drivers according to a first embodiment of the present application; Fig. 7 is a schematic diagram of the locking structure for screw drivers according to a second embodiment of the present application; Fig. 8 is a schematic diagram showing the socket-mounted locking structure according to the second embodiment of the present application; Fig. 9 is an exploded view of the locking structure for screw drivers according to a second embodiment of the present application; Fig. 10 is a schematic diagram of the screw driver according to a second embodiment of the present application. Reference symbol:

[0025] 100: Locking structure for screw driver; 1, Main body; 2, Spindle; 21, Polygonal recess; 3, Bit; 4, Socket wrench; 5, Locking ball; 6, Sealing assembly; 7, Actuating assembly; 71, Insert part; 711, First contact surface; 712, Second contact surface; 72, Fixed bushing; 721, Fixed projection; 722, Anti-rotation pawl; 723, Projecting structure; 73, Drive bushing; 731, Positioning groove; 7311, First channel; 732, Anti-rotation groove; 7321, Second channel; 8, Limit snap ring; 9, First spring; 91, Second spring; 10, Sealing structure; L, Disassembly gap; 200, Screw driver; 201, Main unit. Detailed description of the embodiments

[0026] In the following, the technical solutions of the embodiments of the present utility model application are described clearly and comprehensively with reference to the attached drawings. It should be understood that the described embodiments represent only some, but not all, embodiments. Based on the embodiments provided herein, those skilled in the art can derive further embodiments without inventive activity, which are also covered by the scope of protection of the present utility model application.

[0027] In the description of this application, it should be noted that, unless otherwise clearly defined or limited, the terms "mounted," "connected," and "coupled" are to be understood broadly. They may include, for example, fixed connections, detachable connections, or integral connections; mechanical or electrical connections; direct or indirect connections via intermediate media; and internal connections between two elements. Those skilled in the art will understand the precise meaning of these terms from the specific applications.

[0028] In the description of this application, it should also be noted that the terms "top," "bottom," "left," and "right" are based on the positional or positional relationship shown in the figures. They are used solely for clarity and convenience of description and do not imply that the device or element mentioned must have a particular orientation or be constructed and operated in a particular orientation. Therefore, they should not be construed as a limitation of this application.

[0029] The exemplary embodiments of the present application are explained in detail below with reference to the accompanying drawings. The features described in the following exemplary embodiments can be combined with one another, provided there are no conflicts. Embodiment 1

[0030] The essence of this embodiment is to provide a locking structure for screw drivers, which enables more convenient assembly and disassembly, thereby reducing the production cost of the product.

[0031] With reference to the Fig. 1-4, a locking structure for screw drivers comprises a main body 1, a spindle 2, a locking assembly, a sealing arrangement 6 and an actuating arrangement 7. In this embodiment, the locking assembly consists of at least two balls, in particular locking balls 5 made of steel.

[0032] Specifically, the first end of the main body 1 is provided with a through hole for mounting the spindle 2, whereby one end of the spindle 2 lies within the chamber of the main body 1, while the other end protrudes beyond the main body 1. In other words, the through hole facilitates a rotatable connection between the spindle 2 and the main body 1, so that the spindle 2 can transmit the output power of the motor in the main body 1 to subsequent components, thus achieving effective power transmission. The end of the spindle 2 remote from the main body is equipped with a tool receiving device, which is a polygonal recess 21 extending axially along the spindle 2 and serves to mount a bit 3, whereby the bit 3 is temporarily secured by the polygonal recess. A polygonal projection is arranged on the outer periphery of the polygonal recess for receiving a socket wrench 4.In this device, the power path runs from the motor to spindle 2 and is then transmitted via spindle 2 to bit 3, thereby realizing the power output of the device.

[0033] The polygonal recess is provided with longitudinal openings extending radially from the spindle 2 and serving for the installation of two locking balls 5. These longitudinal openings communicate with the polygonal recess, allowing the locking balls 5 to move along the longitudinal direction of the openings. In other words, the bit 3 can be locked and unlocked by radially sliding the locking balls 5 back and forth along the spindle 2. The inner periphery of the actuating assembly 7, which is arranged on the outer periphery of the spindle 2, abuts the locking balls 5. Through the cooperation between the actuating assembly 7 and the locking balls 5, the bit 3 is locked and unlocked.

[0034] The actuating assembly 7 is fitted over the outer periphery of the spindle 2 and slidably connected to the spindle 2. The actuating assembly 7 includes a removable drive sleeve 73 and a fixed sleeve 72. The actuating assembly 7 slides relative to the spindle 2 and has a locked state and an unlocked state. In the locked state, the actuating assembly 7 is connected to the locking assembly to restrict the tool connected to the tool holder. In the unlocked state, the locking assembly releases the restriction of the tool connected to the tool holder. The fixed sleeve 72 is arranged near the end of the main body 1 with a disassembly gap L between the fixed sleeve 72 and the main body 1. The disassembly gap L serves to restrict the rotation of the fixed sleeve 72 for assembly and disassembly of the drive sleeve 73.

[0035] The actuating assembly includes a male part 71, a fixed sleeve 72, and a drive sleeve 73. The male part 71 is arranged on the outer periphery of the spindle 2. In the locked state, the inner periphery of the male part 71 abuts against the locking balls 5. The fixed sleeve 72 is arranged on the outer periphery of the spindle 2 and is located near the side of the main body 1. The drive sleeve 73 is fitted over the outer periphery of the male part 71 and the fixed sleeve 72. A jig is also fixedly connected to the spindle 2. A first elastic member is arranged between the fixed sleeve 72 and the jig and exerts a restoring force on the fixed sleeve 72 toward the main body 1. The first elastic member is a first spring 9. In this embodiment, the drive sleeve 73 and the male part 71 are fixedly connected by press fitting.The insert part 71 is provided with a first contact surface 711 and a second contact surface 712, wherein the distance of the second contact surface 712 from the central axis of the spindle 2 is greater than the distance of the first contact surface 711 from the central axis of the spindle 2. In the locked state, the first contact surface 711 of the insert part 71 abuts against the locking ball 5 and presses the locking ball 5 into the polygonal recess 21, thereby locking the bit 3. In the unlocked state, when the bit 3 is removed, a force is applied to displace the drive sleeve 73 in the direction away from the main body 1, thereby separating the first contact surface 711 from the locking ball 5. During the pulling process of the bit 3, the locking ball 5 is pressed into the space enclosed by the second contact surface 712, whereby the locking ball 5 is released from the polygonal recess 21 and the locking of the bit 3 is released.After the force on the drive sleeve 73 decreases, the first spring 9 urges the fixed sleeve 72 back toward the main body 1, whereby the fixed sleeve 72 resets the drive sleeve 73 and the insert part 71.

[0036] It should be noted that the positioning of the locking balls 5 can be achieved through the cooperation of the insert part 71, the fixed sleeve 72 and the drive bushing 73.

[0037] Specifically, the drive sleeve 73 and the insert 71 are tightly connected by press fitting, and the fixed sleeve 72 is circumferentially pre-installed on the spindle 2. With this arrangement, simply rotating the drive sleeve 73 enables locking and disassembly with the fixed sleeve 72. This configuration facilitates quick and precise assembly and disassembly of the actuator assembly 7, making operation simple and convenient. In practical applications, there are no restrictions on the arrangement of the insert 71, fixed sleeve 72, and drive sleeve 73, as long as the aforementioned technical effects are achieved.

[0038] In this embodiment, the drive sleeve 73 is rotated forward to lock with the fixed sleeve 72, and the drive sleeve 73 is rotated reversely to unlock the fixed sleeve 72. In practical applications, there are no restrictions on forward and reverse rotation; these can be determined according to actual conditions. It is crucial to determine the direction of rotation based on the rotation of the motor to ensure that the drive sleeve 73 is securely locked in the direction of rotation and prevent loosening.

[0039] With reference to the Fig. 5 and Fig. 6, the outer periphery of the fixed sleeve 72 is provided with projections or grooves, and the inner periphery of the drive bushing 73 is provided with grooves or projections. The projections and grooves cooperate through a sliding and / or rotational fit to achieve the locking and separation of the fixed sleeve 72 and the drive bushing 73. The grooves include positioning grooves 731 and anti-rotation grooves 732. Both the positioning grooves 731 and the anti-rotation grooves 732 are connected to channels that communicate with the end surfaces of the fixed sleeve 72 or the drive bushing 73. The projections include pins and anti-rotation pawl 722. In the locked state of the fixed sleeve 72 and the drive bushing 73, the pins are located within the positioning grooves 731, and the anti-rotation pawl 722 is located within the anti-rotation grooves 732.Positioning grooves 731 are arcuate grooves that rotate around the central axis of the fixed sleeve 72 or the central axis of the drive sleeve 73. When the fixed sleeve 72 and the drive sleeve 73 are locked, the distance from the bottom wall of the positioning groove 731, where the pin abuts, to the central axis of the fixed sleeve 72 or the drive sleeve 73 is minimized, allowing the anti-rotation pawl 722 to enter the anti-rotation groove 732. In other words, the radius of the bottom wall of the positioning groove 731 becomes smaller in the locking direction, minimizing the contact position between the pin and the positioning groove 731, thus allowing radial relative movement between the drive sleeve 73 and the fixed sleeve 72, allowing the anti-rotation pawl 722 to enter the anti-rotation groove 732 for locking.

[0040] With reference to the Fig. 5 and Fig. 6, the outer periphery of the fixed sleeve 72 is provided with fixed pins 721 and anti-rotation pawl 722, while the inner periphery of the drive bushing 73 is provided with positioning grooves 731 and anti-rotation grooves 732. Positioning grooves 731 are designed to engage with fixed pins 721, and anti-rotation grooves 732 are designed to engage with anti-rotation pawl 722. One end of the fixed sleeve 72 near the main body 1 is provided with protrusion structures 723. The protrusion structures 723 include a plurality of protrusions arranged on the end surface of the fixed sleeve 72 and directed toward the main body 1. These protrusions are circumferentially distributed on the end surface of the fixed sleeve 72. In this embodiment, the protrusions are evenly distributed around the circumference; However, in practical applications they can also be arranged irregularly as long as the non-rotating effect is achieved.It should be understood that the circumferential arrangement of the locking structures on the fixed sleeve 72 achieves relative fixation between the fixed sleeve 72 and the drive sleeve 73. The locking structures may consist of fixed pins 721 and anti-rotation pawls 722 or other locking components, provided they can achieve locking between the fixed sleeve 72 and the drive sleeve 73.

[0041] In one embodiment, the fixed pins 721 have a rectangular structure with curvature along the outer periphery of the fixed sleeve 72, and the anti-rotation pawls 722 have a conical structure extending radially outward from the fixed sleeve 72. The anti-rotation grooves 732 are configured as circular holes. However, in practical applications, there are no restrictions on these configurations as long as the aforementioned technical effects are achieved.

[0042] It should be noted that by engaging the positioning grooves 731 with the fixed pins 721, a primary fixation between the fixed sleeve 72 and the drive sleeve 73 is achieved. In addition, by engaging the anti-rotation grooves 732 with the anti-rotation pawls 722, a secondary fixation between the fixed sleeve 72 and the drive sleeve 73 is established. By implementing two locking structures, a double fixation between the fixed sleeve 72 and the drive sleeve 73 is realized, effectively locking the bit 3.

[0043] In another embodiment, the fixed bushing 72 is provided with various locking grooves, and the drive bushing 73 is equipped with corresponding locking components. Through the interaction of the locking grooves and locking components, the fixed bushing 72 and the drive bushing 73 are secured to each other. In practical applications, there are no restrictions on the types, positions, or specifications of the locking structures as long as the aforementioned technical effects are achieved.

[0044] Based on the above embodiment, the inner periphery of the drive sleeve 73 is provided with a first channel 7311 communicating with the positioning groove 731 and a second channel 7321 communicating with the anti-rotation groove 732. One end of each of the first channel 7311 and the second channel 7321 is connected to the end surface of the drive sleeve 73.

[0045] Furthermore, the first channel 7311 and the second channel 7321 are both configured as inverted L-shaped structures. The first channel 7311 cooperates with the fixed pins 721 to allow the fixed pin 721 to move along the first channel 7311, and the second channel 7321 cooperates with the anti-rotation pawls 722 to allow the anti-rotation pawls 722 to move along the second channel 7321.

[0046] It should be noted that by establishing the first channel 7311 and the second channel 7321 on the drive sleeve 73, the fixed pins 721 can be pressed into the drive sleeve 73 via the first channel 7311, and the anti-rotation pawl 722 can be pressed into the drive sleeve 73 via the second channel 7321. The radius of the bottom wall of the first channel 7311 decreases in the locking rotation direction and becomes minimal in the locking position. When the fixed pins 721 move to the locking position (i.e., the end of the first channel 7311), the anti-rotation pawl 722 is pressed into the anti-rotation grooves 732 within the drive sleeve 73. By securing the fixed sleeve 72 with the assembly / disassembly tool 200 and rotating the drive bushing 73 in the forward direction, the connection between the fixed sleeve 72 and the drive bushing 73 is achieved.

[0047] In a preferred embodiment, the positioning grooves 731 and the anti-rotation grooves 732 are respectively arranged at the ends of the first channel 7311 and the second channel 7321. In this configuration, the first channel 7311 and the second channel 7321 provide primary positioning, while the positioning grooves 731 and the anti-rotation grooves 732 provide secondary positioning. This dual positioning mechanism achieves effective locking between the fixed sleeve 72 and the drive bushing 73. In practical applications, however, the specific positions of the positioning grooves 731 and the anti-rotation grooves 732 with respect to the first channel 7311 and the second channel 7321 are not limited as long as the aforementioned technical effects are achieved.

[0048] The self-locking and disassembly process of the device works as follows: By utilizing the first channel 7311 and the second channel 7321 on the drive sleeve 73 to press the fixed pins 721 and the anti-rotation pawl 722 of the fixed sleeve 72 into their corresponding positions in a predetermined assembly direction, a relatively small spatial gap is created between the fixed sleeve 72 and the main body 1. Within this gap, the assembly / disassembly tool 200 is used to secure the protrusion structures 723 on the fixed sleeve 72, thereby restricting the rotation of the fixed sleeve 72. Rotating the drive sleeve 73 causes the anti-rotation pawl 722 on the fixed sleeve 72 to engage the anti-rotation grooves 732 of the drive sleeve 73, while the fixed pins 721 engage the positioning grooves 731 of the drive sleeve 73, thus limiting the axial movement.Under the action of the first spring 9, the drive bushing 73 and the fixed bushing 72 are reliably fixed relative to each other, thereby achieving self-locking. Disassembly follows a similar procedure: The assembly / disassembly tool 200 is used to secure the fixed bushing 72 within the gap between the fixed sleeve 72 and the main body 1. Rotating the drive bushing 73 in the opposite direction unlocks the anti-rotation pawl 722 from the anti-rotation grooves 732 of the drive bushing 73. This process continues until, after the opposite non-rotating connection, the axial tensile force can remove the fixed bushing 72.

[0049] In the above embodiments, each of the fixed pins 721 and the anti-rotation pawl 722 is provided with at least two, and the positioning grooves 731 and the anti-rotation grooves 732 are arranged accordingly.

[0050] It should be understood that in one embodiment, both the fixed pins 721 and the anti-rotation pawl 722 are each provided with two, three, or more. Accordingly, the positioning grooves 731 and the anti-rotation grooves 732 are also provided with two, three, or more. A plurality of fixed pins 721 and anti-rotation pawl 722 may be arranged alternately around the circumference of the fixed sleeve 72 or arranged side by side; there are no restrictions on their specific arrangement.

[0051] In another embodiment, a plurality of fixed pins 721 and a plurality of anti-rotation pawls 722 may be arranged axially alternately along the fixed sleeve 72.

[0052] With reference to the Fig. 1-6, in a preferred embodiment, the second end of the male part 71 abuts against the limiting snap ring 8, and a first spring 9 is arranged between the limiting snap ring 8 and the fixed sleeve 72.

[0053] It should be noted that the self-locking is achieved by the structures of the drive sleeve 73 and the fixed sleeve 72, which prevent each other from loosening. The provision of the limiting snap ring 8 prevents the actuating assembly 7 from falling off the spindle 2. The provision of the first spring 9 ensures that the actuating assembly 7 returns to a free position after the bit 3 is unlocked or locked. By limiting the locking balls 5 within the spindle 2 by the drive sleeve 73 and the insert 71, a self-locking function of the bit 3 within the spindle 2 is achieved. When unlocking to remove the bit 3, pressing the drive sleeve 73 causes the locking assembly to move axially toward the bit 3, thereby displacing the insert 71 from the positioning space of the locking balls 5.The locking balls 5 have radial movement space in the insert part 71. After the bit 3 has been removed, releasing the drive sleeve 73 allows the locking balls 5 to return to their original position under the action of the first spring 9.

[0054] In the above situation, the spindle 2 is a T-shaped shaft, and the outer periphery of the first end of the spindle 2 is provided with an annular groove for mounting O-rings.

[0055] It should be understood that the outer periphery of the first end of the spindle 2 is provided with a sealing structure 10. The sealing structure 10 includes a retaining ring and an O-ring, which fix the socket 4 with the retaining ring and seal the spindle 2 and the socket 4 with the O-ring. In this embodiment, the spindle 2 and the socket 4 are fixed and sealed in the aforementioned manner, but in practical applications, there are no limitations as long as the aforementioned technical effects are achieved.

[0056] In the above embodiment, each longitudinal slot is provided with at least two groups, and each group of longitudinal slots contains at least two locking balls 5.

[0057] It should be noted that the number of longitudinal slots can be adjusted according to actual conditions, and the diameter of the longitudinal slots is not limited as long as they can cooperate with the locking balls 5. In addition, the locking balls 5 can be arranged in a group or in two or more unequal groups without limitation. The main design goal is to ensure that, in the locked state, the first contact surface 711 contacts the locking ball 5 remote from the central axis of the spindle 2 among at least two locking balls 5, thereby partially entering the polygonal recess 21 of the locking ball 5 adjacent to the central axis of the spindle 2.In the unlocked state, the male part 71 slides relative to the spindle 2 until the second contact surface 712 coincides with the sliding groove, whereby the locking ball 5, which is adjacent to the central axis of the spindle 2, can fully enter the sliding groove.

[0058] Based on the above embodiment, a sealing arrangement 6 is provided on the outer periphery of the spindle 2 for sealing the spindle 2 and the main body 1.

[0059] It should be understood that the sealing assembly 6 includes a retaining ring and an O-ring. The retaining ring fixes the spindle 2 to the main body 1, and the O-ring seals the gap between the spindle 2 and the main body 1. In this embodiment, the spindle 2 and the socket 4 are fixed and sealed in the aforementioned manner. However, in practical applications, there are no restrictions on the components used to seal and fix the spindle 2, as long as the aforementioned technical effects are achieved.

[0060] In summary, the locking structure for screw drivers can be used as a multifunctional clamping structure suitable for both impact wrenches and impact screwdrivers. This product is capable of simultaneously securing 12.7 mm or 19 mm sockets 4 and simultaneously clamping 6.35 mm hex bits 3. The product achieves a more convenient assembly and disassembly method, thereby reducing the product's implementation cost. Embodiment 2

[0061] With reference to the Fig. 7-9, the difference from Embodiment 1 is the provision of a second elastic member between the device 8 and the plug-in part 71. The second elastic member is the second spring 91. The first spring 9 and the second spring 91 are positioned on opposite sides of the device 8, wherein the K value of the first elastic member 9 is greater than that of the second spring 91.

[0062] In this embodiment, during operation, the first spring 9 pushes the fixed sleeve 72 toward the main body 1, while the second spring 91 pushes the male part 71 in the direction away from the main body 1. This is because the force of the first spring 9 is greater than that of the second spring 91, whereby the actuating assembly 7 remains in a locked state close to the main body 1 in the free state. When the drive sleeve 73 is driven to move away from the main body 1, the first spring 9 compresses, and the second spring 91 pushes the male part 71 in the direction away from the main body 1, thereby achieving an unlocked state. The structural advantage of this embodiment is that the male part 71 and the drive sleeve 73 are slidably connected to each other, resulting in minimal impact wear during operation and thereby better ensuring the realization of the unlocked state.In Embodiment 1, the male part 71 and the drive sleeve 73 are connected in a press-fit manner, which can lead to wear during operational impacts. Over time, the connection becomes unreliable, causing the drive sleeve 73 to fail to force the male part 71 to move away from the main body 1 in the unlocked state, resulting in the loss of the unlocking function. In this embodiment, the male part 71 and the drive sleeve 73 can be connected either in a press-fit manner or in a sliding manner, both of which can achieve effective unlocking and locking functions. Embodiment 3

[0063] With reference to Fig. 10, this embodiment discloses a screw driver 200 comprising the locking structure 100 of Embodiment 1 or Embodiment 2 and a main unit 201.

[0064] It should be noted that in this specification, relational terms such as "first" and "second" are used merely to distinguish one element from others and do not necessarily require or imply an actual relationship or order between those elements.

[0065] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on differences from other embodiments. Similar or identical parts across the embodiments refer to each other accordingly, where appropriate.

[0066] The above provides a detailed description of a disassembly / assembly structure for a screw driver, as provided by the present utility model. Specific examples are used to illustrate the principles and implementations of the utility model. The description of the above embodiments merely serves to clarify the methods and core concepts of the utility model. Those skilled in the art may make various improvements and modifications based on the principles presented without departing from the basic ideas of this utility model, which also fall within the scope of the appended claims.

Claims

[1] A locking structure for screw drivers, characterized in that it comprises: a main body; a spindle rotatably connected to the main body, the spindle having a tool holder at an end opposite the main body, and a locking assembly connected to the spindle; an actuating assembly fitted over the outer periphery of the spindle and slidably connected to the spindle, the actuating assembly including a removably connected drive sleeve and a fixed sleeve; the actuating assembly having a locked state and an unlocked state; wherein, in the locked state, the actuating assembly is connected to the locking assembly to restrict a tool connected to the tool holder; and In the unlocked state, the locking assembly removes the limitation of the tool connected to the tool holder; wherein the locking assembly comprises at least two balls. [2] The locking structure according to claim 1, wherein the tool receiving device has a polygonal recess arranged at an end of the spindle remote from the main body for receiving a bit. [3] The locking structure according to claim 2, wherein the tool receiving device further comprises a polygonal projection disposed at an end of the spindle remote from the main body for receiving a socket wrench. [4] The locking structure according to claim 2, wherein a sliding groove connecting the polygonal recess and the outer periphery of the spindle is radially arranged on the spindle and the at least two balls are partially arranged within the sliding groove. [5] The locking structure according to claim 3, wherein the rotation axes of the polygonal recess and the polygonal projection coincide. [6] The locking structure according to claim 1, wherein the spindle has a device on the side of the spindle opposite the fixed sleeve from the main body, and a first elastic member is arranged between the fixed sleeve and the device. [7] The locking structure according to claim 4, wherein the drive sleeve is further connected to a male part, and the male part is connected to a ball remote from the central axis of the spindle among the at least two balls. [8] The locking structure according to claim 7, wherein the male part is provided with a first contact surface and a second contact surface, wherein the distance of the second contact surface to the central axis of the spindle is greater than the distance of the first contact surface to the central axis of the spindle. [9] The locking structure according to claim 8, wherein in the locked state, the first contact surface contacts a ball remote from the central axis of the spindle to allow a ball adjacent to the central axis of the spindle to partially enter the polygonal recess; and in the unlocked state, the male part slides relative to the spindle until the second contact surface coincides with the sliding groove, whereby the ball adjacent to the central axis of the spindle can fully enter the sliding groove. [10] A screw driver comprising the locking structure according to any one of claims 1 to 9.

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