A batch head quick-mounting structure and a opener

Abstract

The application relates to the technical field of electric tool accessories, in particular to a quick mounting structure of a batch head and a screwdriver machine. The output shaft of the screwdriver machine is provided with a mounting sleeve hole coaxial with the output shaft and a plurality of assembly holes distributed in the circumferential direction of the output shaft; the mounting sleeve hole is used for inserting and mounting the batch head, and the assembly holes penetrate the hole wall of the mounting sleeve hole and are in communication with the mounting sleeve hole; the quick mounting structure of the batch head comprises a plurality of ball head columns, each ball head column corresponds to an assembly hole, each ball head column comprises an assembly column, a ball head and a spiral spring, the assembly column is provided with an accommodating cavity with an open end, the ball head is movably mounted at the open end of the accommodating cavity, and the spiral spring is mounted in the accommodating cavity and connected with the ball head and the inner wall of the accommodating cavity at both ends; the assembly column is mounted in the corresponding assembly hole, and part of the ball head protrudes into the mounting sleeve hole; the outer peripheral wall of the batch head is provided with an annular stop groove arranged in the circumferential direction, and when the batch head is inserted into the mounting sleeve hole, the part of the ball head protruding into the mounting sleeve hole is accommodated in the annular stop groove.

Description

Technical Field

[0001] This application relates to the field of power tool accessories technology, and more specifically, to a quick-release bit structure and a screwdriver. Background Technology

[0002] Lithium-ion battery screwdrivers, as portable power tools, are widely used in home renovation, industrial assembly, equipment maintenance, and other scenarios. The screwdriver bit, as the actuating component that directly acts on the screw, needs to be frequently changed depending on the screw's size and type. Therefore, the connection structure between the bit and the screwdriver's output shaft must simultaneously meet the requirements of connection reliability and ease of replacement. Its performance directly determines the screwdriver's operating efficiency and user experience.

[0003] However, the current mainstream screwdriver bit connection structures still have many technical shortcomings, making it difficult to simultaneously meet the dual requirements of quick insertion and quick removal: First, traditional quick-insertion structures only focus on the rapid insertion and positioning of the bit, resulting in significant inconvenience when removing it. These structures often use rigid claws or elastic latches to lock the bit, requiring considerable resistance or tools to unlock it, making the operation cumbersome and leading to a poor user experience when frequently changing bits; Second, existing quick-insertion and quick-removal technologies generally suffer from excessively long operating strokes. To unlock the bit, the unlocking component (such as the bushing) needs to be pulled a considerable distance along the output shaft axis. This requires a hand movement that exceeds the natural comfort range, which can easily lead to hand strain with prolonged operation, indicating an unreasonable ergonomic design. Thirdly, in existing technical solutions, the quick-insert and quick-extract functions are independent of each other and have not yet formed an integrated connection structure. This forces users to compromise between different functional requirements, limiting the applicable scenarios for screwdrivers. Fourthly, the bit removal process of most quick-release bit structures requires the coordination of both hands, i.e., one hand to hold the machine body while the other hand operates to unlock and pull out the bit. This is difficult to operate in confined spaces or single-handed operation scenarios (such as climbing operations or repairs inside small equipment), seriously affecting operational flexibility.

[0004] In summary, the shortcomings of existing lithium-ion screwdriver bit connection structures in terms of ease of operation, functional integration, and ergonomics have become key bottlenecks restricting performance improvement. Therefore, developing a structure that enables one-handed operation, quick insertion and removal of the bit, and reliable connection is of great significance for addressing the deficiencies of existing technologies and promoting the upgrading of screwdriver products. This application was thus developed. Utility Model Content

[0005] In view of this, this application provides a quick-release bit structure and a screwdriver, which aims to improve the problems of inconvenient bit removal, excessively long unlocking operation stroke, lack of integration of quick insertion and quick removal functions, and the need for two hands to remove the bit in the current lithium battery screwdriver bit connection structure.

[0006] In a first aspect, this application provides a quick-release bit structure for connecting the bit of a screwdriver and the output shaft of a screwdriver. The output shaft is provided with a mounting sleeve hole coaxial with itself and a plurality of assembly holes distributed circumferentially along the output shaft. The mounting sleeve hole is used for inserting the bit into the screwdriver, and the assembly holes penetrate the hole wall of the mounting sleeve hole and communicate with the mounting sleeve hole.

[0007] The quick-release mechanism for the bit includes multiple ball-end posts, each ball-end post corresponding to one of the mounting holes. Each ball-end post includes a mounting post, a ball head, and a helical spring. The mounting post has a receiving cavity with one end open. The ball head is movably mounted on the open end of the receiving cavity. The helical spring is mounted on the receiving cavity and its two ends are respectively connected to the ball head and the inner wall of the receiving cavity.

[0008] The assembly column is installed in the corresponding assembly hole, and the ball head protrudes into the mounting sleeve hole; the outer peripheral wall of the bit is provided with an annular stop groove arranged circumferentially, and when the bit is inserted into the mounting sleeve hole, the part of the ball head protruding into the mounting sleeve hole is accommodated in the annular stop groove.

[0009] Preferably, the inner wall cross-section of the mounting hole and the outer peripheral cross-section of the bit are adapted polygons.

[0010] Preferably, the bit has a chamfered structure at one end corresponding to the bottom of the mounting sleeve hole.

[0011] Preferably, the assembly column is threaded or interference-fitted with the assembly hole.

[0012] Secondly, this application provides a screwdriver, including the quick-release bit structure provided in the first aspect of this application.

[0013] Compared with the prior art, the quick-release bit structure and screwdriver provided in this application achieve at least the following beneficial effects:

[0014] The quick-release bit structure and screwdriver provided in this application utilize a ball-end joint with a mounting hole. When the bit is inserted into the mounting hole, the ball end can be directly squeezed to automatically retract, achieving positioning without additional operation. When withdrawing, only axial force is required to disengage the ball end from the bit. The entire process is tool-free, improving operational convenience and enabling quick insertion and removal. Secondly, using this quick-release bit structure eliminates the need to pull the unlocking component axially along the output shaft. Bit installation and removal are completed solely through axial insertion and removal, requiring minimal hand movement within a natural and comfortable range. This avoids hand strain issues caused by excessive operating strokes in existing technologies, improving comfort during long-term operation. Furthermore, integrating the quick-insertion and quick-removal functions into the same connection structure, through the synergistic action of the ball end and the coil spring, ensures both rapid positioning during bit insertion and convenient unlocking during withdrawal. This eliminates the need for users to compromise between different functional requirements, effectively expanding the applicable scenarios for the screwdriver. The assembly and disassembly of the bit can be completed with just one hand, without the need for two-handed operation. It can be operated flexibly even in single-handed operation scenarios such as space-constrained work, climbing operations, and maintenance inside small equipment. This solves the problem of existing structures being difficult to operate in special scenarios and significantly improves operational flexibility.

[0015] Of course, any product implementing this application need not specifically need to achieve all of the technical effects described above at the same time.

[0016] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0017] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0018] Figure 1 The diagram shown is an assembly process diagram (I) of the screwdriver bit and output shaft of the screwdriver provided in the embodiment of this application;

[0019] Figure 2 The diagram shown is a schematic representation of the ball-end column in the quick-release bit structure provided in this embodiment of the application.

[0020] Figure 3 The diagram shown is a diagram (II) illustrating the assembly process of the screwdriver bit and output shaft of the screwdriver provided in this embodiment of the application.

[0021] Figure 4 The diagram shown is a diagram (III) illustrating the assembly process of the screwdriver bit and output shaft of the screwdriver provided in this embodiment of the application.

[0022] Figure 5 The diagram shown is a diagram (IV) illustrating the assembly process of the screwdriver bit and output shaft of the screwdriver provided in this embodiment of the application.

[0023] Explanation of reference numerals in the attached figures:

[0024] 10-Screwdriver bit, 11-Annular stop groove, 12-Chamfered structure, 20-Output shaft, 21-Mounting sleeve hole, 22-Assembly hole, 100-Ball head post, 110-Assembly post, 111-Receiving cavity, 120-Ball head, 130-Helical spring. Detailed Implementation

[0025] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0026] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0027] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0028] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0029] Various modifications and variations can be made to this application without departing from its spirit or scope, which will be apparent to those skilled in the art. Therefore, this application is intended to cover modifications and variations falling within the scope of the corresponding claims (the claimed technical solutions) and their equivalents. It should be noted that the embodiments provided in this application can be combined with each other without contradiction.

[0030] 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 discussed further in subsequent figures.

[0031] Figure 1 The diagram shown is an assembly process diagram (I) of the screwdriver bit and output shaft of the screwdriver provided in the embodiment of this application. Figure 2 The diagram shown is a schematic representation of the ball-end column in the quick-release bit structure provided in this embodiment of the application. Figure 3 The diagram shown is a diagram (II) illustrating the assembly process of the screwdriver bit and output shaft of the screwdriver provided in this embodiment of the application. Figure 4 The diagram shown is a diagram (III) illustrating the assembly process of the screwdriver bit and output shaft of the screwdriver provided in this embodiment of the application. Figure 5The diagram shown is a diagram (IV) illustrating the assembly process of the screwdriver bit and output shaft of the screwdriver provided in this embodiment of the application.

[0032] Please refer to Figures 1 to 5 This application provides a quick-connect structure for connecting the screwdriver bit 10 and the output shaft 20 of a screwdriver.

[0033] The output shaft 20 is provided with a mounting sleeve hole 21 coaxial with itself, and a plurality of assembly holes 22 distributed along the circumference of the output shaft 20; the mounting sleeve hole 21 is used for inserting and installing the bit 10, and the assembly holes 22 penetrate through the hole wall of the mounting sleeve hole 21 and communicate with the mounting sleeve hole 21.

[0034] The quick-release structure of the bit 10 includes multiple ball head posts 100, each ball head post 100 corresponding to a mounting hole 22. Each ball head post 100 includes a mounting post 110, a ball head 120, and a coil spring 130. The mounting post 110 has a receiving cavity 111 with one end open. The ball head 120 is movably mounted on the open end of the receiving cavity 111. The coil spring 130 is mounted on the receiving cavity 111 and its two ends are respectively connected to the ball head 120 and the inner wall of the receiving cavity 111.

[0035] The assembly column 110 is installed in the corresponding assembly hole 22, and part of the ball head 120 protrudes into the mounting sleeve hole 21; the outer peripheral wall of the bit 10 is provided with an annular stop groove 11 arranged circumferentially. When the bit 10 is inserted into the mounting sleeve hole 21, the part of the ball head 120 protruding into the mounting sleeve hole 21 is accommodated in the annular stop groove 11.

[0036] The quick-release structure of the screwdriver bit 10 provided in this embodiment operates as follows:

[0037] Installation process for bit 10 (quick installation):

[0038] See Figure 1 In the initial state: the mounting sleeve hole 21 of the output shaft 20 is in the assembly-ready state, the coil spring 130 of the ball joint 100 is naturally extended, driving the ball joint 120 to protrude into the mounting sleeve hole 21 (the protruding part is 1 / 3-1 / 2 of the ball joint 120). See also Figure 3 and Figure 4 Insertion guidance stage: The user inserts the bit 10 axially along the mounting sleeve hole 21. The outer peripheral wall of the front end of the bit 10 contacts the ball head 120 and applies a radially outward thrust. The ball head 120 compresses the coil spring 130 and retracts into the receiving cavity 111, forming a clearance space, allowing the bit 10 to continue to penetrate deeper. See also Figure 5Engaging and positioning stage: When the bit 10 is inserted to the preset position, the annular stop groove 11 is exactly aligned with the ball head 120. The coil spring 130 resets (or partially resets) and pushes the ball head 120 out into the mounting sleeve hole 21. The protruding part of the ball head 120 is engaged in the annular stop groove 11. The radial engagement between the ball head 120 and the annular stop groove 11 restricts the axial movement of the bit 10. At the same time, the circumferentially distributed multiple ball heads 120 abut against the inner wall of the annular stop groove 11 to restrict circumferential rotation, thus completing the installation and positioning.

[0039] Disassembly process of bit 10 (quick release):

[0040] See Figure 5 Unlocking phase: The user pulls the bit 10 outward along the axial direction. The sidewall of the annular stop groove 11 applies a radially outward force to the ball head 120, forcing the ball head 120 to compress the helical spring 130 and retract into the receiving cavity 111, thus disengaging from the stop groove constraint. See also Figure 4 Removal stage: As the bit 10 is continuously pulled out, the ball head 120 retracts out of the annular stop groove 11 area until the coil spring 130 gradually returns to its original position, and the ball head 120 returns to its initial state of protruding into the mounting sleeve hole 21, waiting for the next assembly.

[0041] In this embodiment, through the mating structure of the ball head 100 and the mounting hole 22, when the bit 10 is inserted into the mounting sleeve hole 21, the ball head 120 can be directly squeezed to automatically retract, completing the positioning without additional operation; when pulling out, only axial force is needed to disengage the ball head 120 from the bit 10. The entire process does not require tools, improving operational convenience and achieving quick insertion and removal. Secondly, using this quick-installation structure of the bit 10 eliminates the need to pull the unlocking component axially along the output shaft 20. The bit 10 can be installed and removed simply by axial insertion and removal, with minimal hand movement and within a natural and comfortable range, avoiding the hand strain caused by excessive operating stroke in existing technologies, and improving the comfort of long-term operation. Furthermore, by integrating the quick insertion and quick removal functions into the same connection structure, through the synergistic action of the ball head 120 and the coil spring 130, both rapid positioning when the bit 10 is inserted and convenient unlocking when pulled out are ensured, eliminating the need for users to compromise between different functional requirements and effectively broadening the applicable scenarios of the screwdriver. The assembly and disassembly of the bit 10 can be completed with just one hand, without the need for two-handed operation. It can be operated flexibly even in single-handed operation scenarios such as space-constrained or climbing operations, or maintenance inside small equipment. This solves the problem of existing structures being difficult to operate in special scenarios and significantly improves operational flexibility.

[0042] See Figure 1 , Figures 3 to 5 In some embodiments, the inner wall cross-section of the mounting sleeve 21 is a fitted polygon to the outer peripheral cross-section of the bit 10, so as to restrict the circumferential rotation of the bit relative to the mounting sleeve.

[0043] In this embodiment, the adapting polygonal structure restricts the circumferential rotation of the bit 10 through shape interference, forming a "double circumferential constraint" with the ball head 120 for positioning, which can prevent the bit 10 from slipping circumferentially during operation. In addition, the polygonal structure provides precise axial guidance for the insertion of the bit 10, avoiding insertion jamming. Combined with the elastic avoidance of the ball head 120, it shortens the arrival time of the bit 10 and improves the assembly efficiency of the bit 10 and the output shaft 20.

[0044] See Figure 1 In some embodiments, the insertion end of the mounting sleeve 21 is provided with a chamfered structure 12. When the bit 10 is inserted into the mounting sleeve 21, the outer chamfered structure 12 guides the bit 10 smoothly into the mounting sleeve 21 and forms a smooth contact with the ball head 120, reducing insertion resistance and jamming, and further improving the convenience of quick insertion. In addition, by gradually squeezing the ball head 120 through the smooth curved surface, rigid collisions and friction are avoided, reducing wear on the ball head 120, the bit 10, and the opening of the mounting sleeve 21, and extending the structural life.

[0045] See Figure 1 , Figures 3 to 5 In some embodiments, the assembly column 110 and the corresponding assembly hole 22 are connected by threads or interference fit to fix the assembly column 110 in the assembly hole 22, so as to prevent its axial movement or circumferential loosening, ensure the ball head 120 is accurately positioned and the elastic abutment force is stable, prevent the bit 10 from slipping, and enhance the overall connection reliability.

[0046] In practice, the fit between the assembly column 110 and the corresponding assembly hole 22 can be selected as needed. Among them, the threaded fit facilitates the maintenance and replacement of vulnerable parts and is suitable for scenarios that require long-term maintenance; the interference fit achieves permanent fixation, is suitable for mass production, and broadens the product compatibility range.

[0047] Based on the same inventive concept, this application also provides a screwdriver. This screwdriver includes the quick-release bit structure provided in any of the above embodiments.

[0048] It is understood that the screwdriver provided in this application embodiment has the beneficial effects of the quick-release structure of the bit 10 provided in this application embodiment. For details, please refer to the specific description of the quick-release structure of the bit 10 in the above embodiments. This embodiment will not repeat the description here.

[0049] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A quick-connect screwdriver bit structure for connecting the screwdriver bit and the output shaft of a screwdriver, characterized in that, The output shaft is provided with a mounting sleeve hole coaxial with itself, and a plurality of assembly holes distributed along the circumference of the output shaft; the mounting sleeve hole is used for the insertion and installation of the bit, and the assembly holes penetrate the hole wall of the mounting sleeve hole and communicate with the mounting sleeve hole. The quick-release mechanism for the bit includes multiple ball-end posts, each ball-end post corresponding to one of the mounting holes. Each ball-end post includes a mounting post, a ball head, and a helical spring. The mounting post has a receiving cavity with one end open. The ball head is movably mounted on the open end of the receiving cavity. The helical spring is mounted on the receiving cavity and its two ends are respectively connected to the ball head and the inner wall of the receiving cavity. The assembly column is installed in the corresponding assembly hole, and the ball head protrudes into the mounting sleeve hole; the outer peripheral wall of the bit is provided with an annular stop groove arranged circumferentially, and when the bit is inserted into the mounting sleeve hole, the part of the ball head protruding into the mounting sleeve hole is accommodated in the annular stop groove.

2. The quick-release bit structure as described in claim 1, characterized in that, The inner wall cross-section of the mounting hole is a polygon that matches the outer circumferential cross-section of the bit.

3. The quick-release bit structure as described in claim 2, characterized in that, The insertion end of the mounting sleeve is provided with a chamfered structure.

4. The quick-release bit structure as described in claim 2, characterized in that, The assembly column and the corresponding assembly hole are connected by threads or interference fit.

5. A screwdriver, characterized in that, Includes the quick-release bit structure as described in any one of claims 1 to 4.

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