Cross slot based micro fastener

Abstract

The utility model provides a micro fastener based on cross groove, and relates to mechanical fastener technical field, including adjusting cover, depth adjusting cover and cross movable part. Adjusting cover bottom fixed connection fastening screw rod, the cross movable part with spacing groove is equipped in the depth adjusting cover, and the movable cover is equipped in the adjusting cover, the depth adjusting cover bottom symmetry is equipped with two groups of clamping position subassembly, each contains slidable inclined head stopper rod, adjusting cover inner wall is equipped with multiple sets of triangular limit block and two groups of top block. Through the cross movable part (pressure is between reset spring one and elastic piece elasticity) of pressing down, the depth adjusting cover is pushed and moves down, makes the inclined head stopper rod to lock the gear after the compression reset spring no. 2 crosses the triangular limit block, realizes the cross movable part depth multistage regulation. Cross movable part obtains the depth adjusting cover bottom support and elastic piece radial constraint in this state, significantly enhances and the engagement depth, stability and antiskid ability of screwdriver head, solves the problem that the tool slips, drops out when operating in the narrow space.

Description

Technical Field

[0001] This utility model relates to the field of mechanical fastener technology, and in particular to miniature fasteners based on cross grooves. Background Technology

[0002] In precision operations such as mechanical assembly and electronic equipment repair, screw tightening is often required in space-constrained environments (such as deep holes or narrow cavities). Existing miniature fastening tools or bit adapters have the following limitations:

[0003] 1. Poor operational stability: When tightening micro screws, especially when working deep into holes, standard screwdriver bits or tips often have a shallow engagement depth with the screw head groove. This results in insufficient radial constraint and axial support between the tool head and the screw, making it prone to wobbling, slippage, or even tooth skipping when torque is applied, seriously affecting tightening efficiency and accuracy, and even damaging the screw or workpiece.

[0004] 2. Insufficient depth adaptability: For screws of different sizes (such as countersunk head and countersunk head) or mounting holes of different depths, it is necessary to select a bit of a specific length or add an extension rod. This increases the complexity of tool configuration, and it is very inconvenient to frequently change tools or use cumbersome extension rods in narrow spaces. In addition, the extension rod itself will further reduce the stability of operation.

[0005] Based on this, the present invention provides a miniature fastener based on a cross groove to solve one or more of the problems mentioned above. Utility Model Content

[0006] This invention provides a miniature fastener based on a cross groove to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution, including: an adjusting sleeve, a depth adjusting sleeve movably disposed inside the adjusting sleeve, a cross-shaped movable member movably disposed inside the depth adjusting sleeve, and a fastening screw fixedly disposed at the bottom of the adjusting sleeve.

[0008] Preferably, the outer wall of the cross-shaped movable part is provided with several sets of limiting grooves, and the inner wall of the adjusting sleeve is provided with several sets of limiting rods, with each set of limiting grooves corresponding to a set of limiting rods.

[0009] Preferably, the bottom of the depth adjustment sleeve is fixedly provided with a set of positioning blocks and two sets of locking components, and the two sets of locking components are symmetrically arranged on both sides of the positioning blocks.

[0010] Preferably, each set of locking components has the same inclined stop rod slidingly installed inside.

[0011] Preferably, the inner wall of the adjusting sleeve is symmetrically provided with several sets of triangular limiting blocks and two sets of top blocks, and the top blocks are located below the triangular limiting blocks.

[0012] Preferably, the distance between the top block and the depth adjustment sleeve is less than the distance between the triangular limiting block and the depth adjustment sleeve.

[0013] Preferably, one end of the reset spring is fixedly connected to the positioning block, and the other end of the reset spring is fixedly connected to the bottom of the inner wall of the adjusting sleeve. A ring of elastic element is fixedly provided on the inner wall of the depth adjusting sleeve, and two sets of locking rods are symmetrically fixedly provided at the bottom of the cross movable part.

[0014] Preferably, the adjusting sleeve consists of an upper fastener and a lower fastener. The bottom of the upper fastener is fixed with several sets of fixing rods, and the top of the lower fastener is provided with several sets of limiting slots. Each set of fixing rods corresponds to a set of limiting slots. The fixing rods and the outer wall of the lower fastener are provided with the same pin holes. The fastening screw is fixedly connected to the center of the bottom of the lower fastener.

[0015] Preferably, the positioning assembly includes: a positioning sleeve, which is fixedly connected to the bottom of the depth adjustment sleeve, and a beveled stop rod is movably disposed on the inner wall of the positioning sleeve, with one end of the beveled stop rod away from the inner wall of the adjustment sleeve extending to form a fixed end.

[0016] Preferably, the inclined head stop rod and the top of the locking sleeve are both provided with the same locking groove. The second positioning block is fixedly located on the side of the locking sleeve away from the inner wall of the inclined head stop rod. One end of the second return spring is fixedly connected to the fixed end of the inclined head stop rod, and the other end of the second return spring is fixedly connected to the second positioning block.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This invention features intelligent multi-level depth adjustment achieved through a pressing operation, providing strong radial constraint and axial support for the screwdriver bit, significantly improving the stability, anti-slip capability, and overall rigidity of the tool-fastener interface. Simultaneously, its ingenious one-button depth adjustment and automatic reset mechanism greatly simplifies the operation process, significantly improving operational efficiency and ease of use. All these improvements work together to enable tool users to complete tightening operations more reliably and efficiently, offering significant advantages, especially in situations requiring precise operation or where space is limited. Attached Figure Description

[0019] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0020] In the attached diagram:

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2This is a schematic diagram of the cross-sectional structure of the adjusting sleeve of this utility model;

[0023] Figure 3 This is a schematic diagram showing the cooperation between the cross-shaped movable part and the depth adjustment sleeve in this utility model;

[0024] Figure 4 This is a schematic cross-sectional view of the carding component in this utility model;

[0025] Figure 5 This is a schematic diagram of the explosion structure of the adjusting sleeve in this utility model.

[0026] In the diagram: 1. Adjusting sleeve; 2. Cross-shaped movable part; 3. Fastening screw; 4. Limiting groove; 5. Depth adjusting sleeve; 6. Locking assembly; 7. Positioning block one; 8. Angled stop rod; 9. Triangular limiting block; 10. Return spring one; 11. Top block; 12. Locking rod; 13. Elastic element; 14. Locking sleeve; 15. Locking groove; 16. Fixed end; 17. Return spring two; 18. Positioning block two; 19. Upper fastener; 20. Lower fastener; 21. Fixed insert rod; 22. Limiting slot; 23. Pin hole. Detailed Implementation

[0027] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described using the same technical terms, and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, such a combination should be considered non-existent and not within the scope of protection claimed by this utility model.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] Please see Figures 1-4 The present invention provides a technical solution, including: an adjusting sleeve 1, a depth adjusting sleeve 5 movably disposed inside the adjusting sleeve 1, a cross-shaped movable member 2 movably disposed inside the depth adjusting sleeve 5, and a fastening screw 3 fixedly disposed at the bottom of the adjusting sleeve 1.

[0031] Furthermore, the outer wall of the cross-shaped movable part 2 is fixedly provided with several sets of limiting grooves 4, and the inner wall of the adjusting sleeve 1 is provided with several sets of limiting rods, with each set of limiting grooves 4 corresponding to a set of limiting rods.

[0032] Furthermore, a set of positioning blocks 7 and two sets of locking components 6 are fixedly provided at the bottom of the depth adjustment sleeve 5, and the two sets of locking components 6 are symmetrically arranged on both sides of the positioning blocks 7.

[0033] Furthermore, each set of locking components 6 is equipped with the same inclined stop rod 8.

[0034] Furthermore, the inner wall of the adjusting sleeve 1 is symmetrically provided with several sets of triangular limiting blocks 9 and two sets of top blocks 11, and the top blocks 11 are located below the triangular limiting blocks 9.

[0035] Furthermore, the distance between the top block 11 and the depth adjustment sleeve 5 is less than the distance between the triangular limit block 9 and the depth adjustment sleeve 5.

[0036] Furthermore, one end of the reset spring 10 is fixedly connected to the positioning block 7, and the other end of the reset spring 10 is fixedly connected to the bottom of the inner wall of the adjusting sleeve 1. A ring of elastic element 13 is fixedly provided on the inner wall of the depth adjusting sleeve 5, and two sets of locking rods 12 are symmetrically fixedly provided at the bottom of the cross movable part 2.

[0037] Furthermore, the adjusting sleeve 1 is composed of an upper fastener 19 and a lower fastener 20. The bottom of the upper fastener 19 is fixedly provided with several sets of fixing rods 21, and the top of the lower fastener 20 is provided with several sets of limiting slots 22. Each set of fixing rods 21 corresponds to a set of limiting slots 22. The outer walls of the fixing rods 21 and the lower fastener 20 are provided with the same pin holes 23. The fastening screw 3 is fixedly connected to the bottom center of the lower fastener 20.

[0038] Furthermore, several sets of triangular limiting blocks 9 are installed on the inner wall of the lower fastener 20, and several sets of limiting rods are provided on the inner walls of both the upper fastener 19 and the lower fastener 20.

[0039] Furthermore, the positioning assembly 6 includes: a positioning sleeve 14, which is fixedly connected to the bottom of the depth adjustment sleeve 5, and a beveled stop rod 8 is movably disposed on the inner wall of the positioning sleeve 14, with one end of the beveled stop rod 8 away from the inner wall of the adjustment sleeve 1 extending to form a fixed end 16.

[0040] Furthermore, the top of both the inclined head stop rod 8 and the locking sleeve 14 are provided with the same locking groove 15. The second positioning block 18 is fixedly installed on the side of the locking sleeve 14 away from the inner wall of the inclined head stop rod 8. One end of the second return spring 17 is fixedly connected to the fixed end 16 of the inclined head stop rod 8, and the other end of the second return spring 17 is fixedly connected to the second positioning block 18.

[0041] Preferably, the elastic element 13 can be any elastic ball, spring sheet, etc.

[0042] The working principle and beneficial effects of the above scheme are as follows: In use, a screwdriver is used to align with the cross-shaped movable part 2, thereby driving the fastening screw 3 to rotate through the adjusting sleeve 1. In order to adapt to the installation of different workpieces and improve stability and concentricity, thereby indirectly improving the torque transmission accuracy, a downward pressure is applied to the cross-shaped movable part 2 before tightening the fastening screw 3. This downward pressure is greater than the elastic force of the return spring 10 and less than the squeezing force applied to the cross-shaped movable part 2 by the elastic element 13. At this time, the depth adjusting sleeve 5 will first slide down along the inner wall of the adjusting sleeve 1. With a set of triangular limit blocks 9 as a unit depth, when descending by a unit depth, the inclined head stop rod 8 will first be restricted by the triangular limit block 9 and slide into the locking sleeve 14, compressing the return spring 17. After moving to the next triangular limit block 9, the inclined head stop rod 8 is pushed by the return spring 17 to reset. At this time, the cross-shaped movable part 2 pushes the depth adjusting sleeve 5 down by a unit depth, thereby achieving more accurate torque transmission.

[0043] By employing the above method, the cross-shaped movable part 2 can descend to different depths along the adjusting sleeve 1, thereby improving stability and concentricity, and indirectly enhancing torque transmission accuracy. When the cross-shaped movable part 2 is not pressed down, it is located at a higher position inside the adjusting sleeve 1. When the screwdriver bit is inserted, its depth into the cross groove is shallow (only the height of the cross-shaped movable part 2 itself), which may make it more prone to shaking or slippage during tightening, resulting in unstable or inaccurate applied torque. Therefore, by pressing down the cross-shaped movable part 2, making it protrude less from the adjusting sleeve 1 (or flush with it), and making the cross-shaped movable part 2 more deeply embedded inside the depth adjusting sleeve 5 (obtaining more stable lateral support from the elastic element 13), the screwdriver bit can be inserted deeper into the cross groove, resulting in a larger contact area and a more reliable engagement. This significantly enhances the engagement depth and stability between the screwdriver bit and the cross groove. Furthermore, the cross-shaped movable part 2 is compressed axially (supported at the bottom of the depth adjusting sleeve 5) and constrained radially by the elastic element 13, making the entire structure more "robust" and thus improving the rigidity of the system. Therefore, the multi-point support and constraint reduce the swaying of the system during the tightening process and improve concentricity.

[0044] The above method significantly reduces the risk of slippage, skipping, or disengagement of the screwdriver bit between the Phillips head and the tightening groove during the tightening process. This means that the torque applied by the user can be transmitted to the fastening screw 3 more directly, efficiently, and reliably, thereby reducing torque loss and uncertainty. This makes the actual, effective torque transmission closer to the user's intention, thus achieving more precise torque transmission. This stability is especially crucial in confined spaces, when specific torque values ​​are required, or when using power tools.

[0045] When the cross-shaped movable part 2 needs to be reset, simply apply downward pressure to push the depth adjusting sleeve 5 to the bottom of the adjusting sleeve 1, causing the inclined head stop rod 8 to abut against the top block 11. Since the size of the top block 11 is larger than that of the triangular limiting block 9 (i.e., the distance between the top block 11 and the depth adjusting sleeve 5 is smaller than the distance between the triangular limiting block 9 and the depth adjusting sleeve 5), the inclined head stop rod 8 is squeezed into the locking sleeve 14, increasing its length. This causes the locking groove 15 on the locking sleeve 14 and the locking groove 15 on the inclined head stop rod 8 to be on the same axis. The cross-shaped movable part 2 continues to descend, causing the locking rod 12 to enter the locking groove 15, thereby preventing the inclined head stop rod 8 from resetting. When the pressure is released, the return spring 10 will push the depth adjustment sleeve 5 upward to reset. Since the inclined stop rod 8 is always inside the locking sleeve 14 and will not pop out, the triangular limit block 9 will not block the rise of the depth adjustment sleeve 5. When the depth adjustment sleeve 5 returns to its original position, an upward force needs to be applied to the cross movable part 2 with the help of a tool. This force needs to be greater than the squeezing force of the elastic member 13 on the cross movable part 2. Then, while the cross movable part 2 can be pulled out of the depth adjustment sleeve 5, the locking rod 12 will disengage from the locking groove 15. At this time, the inclined stop rod 8 is no longer restricted, and the return spring 17 can push it to reset, ready for the next use.

[0046] The width of the depth adjustment sleeve 5 is larger than the diameter of the cross-shaped movable part 2. Therefore, when the cross-shaped movable part 2 is pulled out, the depth adjustment sleeve 5 will not detach from the adjustment sleeve 1. The cooperation between the limiting groove 4 and the limiting rod on the inner wall of the adjustment sleeve 1 allows the cross-shaped movable part 2 to drive the adjustment sleeve 1 and the fastening screw 3 below to rotate synchronously without restricting the up and down movement of the cross-shaped movable part 2. By splitting the adjustment sleeve 1 into the upper fastener 19 and the lower fastener 20, it is convenient to install and replace the components on its inner wall. When the two are combined to form the adjustment sleeve 1, the several sets of fixing rods 21 set at the bottom of the upper fastener 19 can be aligned with the several sets of limiting slots 22 opened on the lower fastener 20 and inserted. Then, several sets of pins are inserted into the pin holes 23 one by one for fastening, thereby preventing the upper fastener 19 and the lower fastener 20 from slipping. The fixing rods 21 and the pins are made of high-rigidity materials, which can provide higher support when the micro fastener is tightened.

[0047] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A miniature fastener based on a cross-groove, characterized in that: include: Adjusting sleeve (1), with depth adjusting sleeve (5) movably provided inside the adjusting sleeve (1), and cross movable part (2) movably provided inside the depth adjusting sleeve (5), and fastening screw (3) fixedly provided at the bottom of the adjusting sleeve (1).

2. The miniature fastener based on cross-groove as described in claim 1, characterized in that: The outer wall of the cross-shaped movable part (2) is fixed with several sets of limiting grooves (4), and the inner wall of the adjusting sleeve (1) is provided with several sets of limiting rods. Each set of limiting grooves (4) corresponds to a set of limiting rods.

3. The miniature fastener based on a cross-groove as described in claim 1, characterized in that: The bottom of the depth adjustment sleeve (5) is fixed with a set of positioning blocks (7) and two sets of locking components (6), and the two sets of locking components (6) are symmetrically arranged on both sides of the positioning blocks (7).

4. The miniature fastener based on cross-groove as described in claim 3, characterized in that: Each set of locking components (6) is equipped with the same inclined stop rod (8).

5. The miniature fastener based on a cross-groove as described in claim 4, characterized in that: The inner wall of the adjusting sleeve (1) is symmetrically provided with several sets of triangular limiting blocks (9) and two sets of top blocks (11), and the top blocks (11) are located below the triangular limiting blocks (9).

6. The miniature fastener based on a cross-groove as described in claim 5, characterized in that: The distance between the top block (11) and the depth adjustment sleeve (5) is less than the distance between the triangular limit block (9) and the depth adjustment sleeve (5).

7. The miniature fastener based on a cross-groove as described in claim 3, characterized in that: One end of the reset spring (10) is fixedly connected to the positioning block (7), and the other end of the reset spring (10) is fixedly connected to the bottom of the inner wall of the adjusting sleeve (1). A ring of elastic element (13) is fixedly provided on the inner wall of the depth adjusting sleeve (5), and two sets of locking rods (12) are symmetrically fixedly provided on the bottom of the cross movable element (2).

8. The miniature fastener based on cross-groove as described in claim 1, characterized in that: The adjusting sleeve (1) consists of an upper fastener (19) and a lower fastener (20). The bottom of the upper fastener (19) is fixed with several sets of fixing rods (21), and the top of the lower fastener (20) is provided with several sets of limiting slots (22). Each set of fixing rods (21) corresponds to a set of limiting slots (22). The outer walls of the fixing rods (21) and the lower fastener (20) are provided with the same pin holes (23). The fastening screw (3) is fixedly connected to the center of the bottom of the lower fastener (20).

9. The miniature fastener based on a cross-groove as described in claim 7, characterized in that: The positioning assembly (6) includes: a positioning sleeve (14), which is fixedly connected to the bottom of the depth adjustment sleeve (5), and a slanted stop rod (8) is movably disposed on the inner wall of the positioning sleeve (14), with one end of the slanted stop rod (8) away from the inner wall of the adjustment sleeve (1) extending to form a fixed end (16).

10. The miniature fastener based on a cross-groove as described in claim 9, characterized in that: The top of the inclined head stop rod (8) and the locking sleeve (14) are both provided with the same locking groove (15). The second positioning block (18) is fixedly installed on the side of the locking sleeve (14) away from the inner wall of the inclined head stop rod (8). One end of the second return spring (17) is fixedly connected to the fixed end (16) of the inclined head stop rod (8), and the other end of the second return spring (17) is fixedly connected to the second positioning block (18).

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