One-way screw and its dismounting tool

Abstract

The application belongs to the technical field of mechanical fasteners, and particularly relates to a one-way screw and a dismounting tool thereof. The dismounting tool comprises a base, a pressure adjusting mechanism, a blade and a rotary driving mechanism, the pressure adjusting mechanism is arranged on the base; the blade is connected with the pressure adjusting mechanism, the blade is driven by the pressure adjusting mechanism to move in a third direction to contact with and apply pressure to the outer surface of the head of the one-way screw; the rotary driving mechanism is used for driving the blade to rotate around the axis thereof; when the blade contacts with the outer surface of the screw head under the action of the pressure and is driven by the rotary driving mechanism to rotate in the second direction, the force for driving the one-way screw to rotate in the second direction is generated between the blade and the outer surface through extrusion, so that the screw is dismounted. The application effectively reduces the technical problem that the one-way screw is not easy to dismount in production and maintenance.

Description

Technical Field

[0001] This application belongs to the field of mechanical fastener technology, specifically relating to a one-way screw and its disassembly tool. Background Technology

[0002] One-way screws are a common type of anti-disassembly fastener. The principle behind them is that when a standard tool is used to rotate them in the locking direction, they can be tightened normally; however, when an attempt is made to rotate them in the disassembly direction, their special head structure causes the tool to slip, thus preventing the transmission of torque and preventing third parties from disassembling them at will.

[0003] However, this anti-disassembly feature also presents difficulties for manufacturers when disassembly is required during product debugging, maintenance, or specific production processes. Utility Model Content

[0004] The purpose of this application is to solve the technical problem of the difficulty in disassembling one-way screws in related technologies.

[0005] A first aspect of this application provides a one-way screw, comprising: a threaded shank; a screw head having an anti-rotation structure configured to transmit torque to tighten the screw when a tightening tool engages with it and rotates in a first direction; and to cause the tool to slip and prevent the transmission of torque when the tightening tool engages with it and rotates in a second direction opposite to the first direction; wherein the outer surface of the screw head is configured to contact the blade of a disassembly tool under pressure, and to generate a force driving the screw to rotate in the second direction by the rotational movement of the blade in the second direction.

[0006] In one exemplary embodiment of this application, the anti-rotation structure includes at least one protrusion extending from the periphery of the screw head.

[0007] In one exemplary embodiment of this application, the protrusion is provided with a first working surface and a second working surface on two circumferentially opposite sides of the screw head, the first working surface being a plane suitable for transmitting tightening torque, and the second working surface being an inclined surface suitable for causing a standard tightening tool to slip.

[0008] A second aspect of this application provides a disassembly fixture for a one-way screw as described in any of the preceding claims, comprising: a base; a pressure adjusting mechanism disposed on the base; a blade connected to the pressure adjusting mechanism, the blade moving upward in a third direction under the drive of the pressure adjusting mechanism to contact the outer surface of the head of the one-way screw and apply pressure; and a rotation driving mechanism for driving the blade to rotate about its axis; wherein, when the blade contacts the outer surface of the screw head under pressure and is driven to rotate in a second direction by the rotation driving mechanism, the blade and the outer surface generate a force through compression that drives the one-way screw to rotate in the second direction, thereby removing the screw.

[0009] In another exemplary embodiment of this application, the pressure regulating mechanism includes: a screw, disposed on the base and extending in the third direction; a movable block, which is threadedly engaged with the screw; a first driving part for driving the screw to rotate, thereby causing the movable block to move upward in the third direction; wherein the blade is mounted on the movable block.

[0010] In another exemplary embodiment of this application, the pressure regulating mechanism further includes at least one guide rod, which is arranged parallel to the screw, passes through the movable block, and is connected to the base.

[0011] In another exemplary embodiment of this application, the rotary drive mechanism includes a second drive unit and a rotating shaft. The rotating shaft extends upward from the third party and is rotatably disposed on the moving block. The blade is mounted on one end of the rotating shaft, and the second drive unit is used to drive the rotating shaft to rotate.

[0012] In another exemplary embodiment of this application, the pitch of the thread that mates with the screw on the movable block is equal to the pitch of the one-way screw; the pitch of the threaded pair connecting the rotating shaft and the movable block is equal to the pitch of the one-way screw.

[0013] In another exemplary embodiment of this application, the blade is a planar block structure; arc-shaped structures are respectively provided on opposite sides perpendicular to the height direction of the threaded rod in a centrally symmetrical manner, and the arc-shaped structures extend along the height direction of the threaded rod.

[0014] In another exemplary embodiment of this application, the movable block is provided with a pad; the pressure regulating mechanism further includes a fixed seat, which is arranged opposite to and parallel to the base, and the opposite ends of the screw and the guide rod are respectively connected to the base and the fixed seat, and the screw passes through the fixed seat.

[0015] The one-way screw and its disassembly tooling of this application have at least the following beneficial effects: This application not only designs a one-way screw with an anti-rotation structure to effectively prevent reverse disassembly by standard tools, ensuring the security and tamper-proof performance of the connection point; but also designs a dedicated disassembly fixture. Its pressure adjustment mechanism applies controllable pressure to the blade, and a rotary drive mechanism drives the blade to rotate. This causes the blade to compress the screw head surface, generating a large reverse torque, thereby forcibly and reliably disassembling the one-way screw. This application effectively reduces the technical problem of one-way screws being difficult to remove during production and maintenance, providing a safe, efficient, and economical dedicated disassembly method.

[0016] Other features and advantages of this application will become apparent from the following detailed description, or may be learned in part from practice of this application.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0019] Figure 1 A schematic diagram of the structure of a one-way screw provided in some embodiments of this application is shown.

[0020] Figure 2 A schematic diagram of the disassembly tooling in contact with a one-way screw provided in some embodiments of this application is shown.

[0021] Figure 3 A schematic diagram of the blade provided in some embodiments of this application is shown.

[0022] Figure 4 A schematic diagram of the structure of the blade and one-way screw provided in some embodiments of this application is shown.

[0023] Explanation of reference numerals in the attached figures: 100. One-way screw; 110. Threaded shank; 120. Screw head; 130. Anti-rotation structure; 131. Protrusion; 1310. First working surface; 1311. Second working surface; 200. Disassembly fixture; 210. Base; 220. Pressure adjustment mechanism; 221. Screw; 222. Moving block; 223. First drive unit; 224. Guide rod; 225. Fixed seat; 226. Pad; 230. Blade; 231. Arc-shaped structure; 240. Rotary drive mechanism; 241. Second drive unit; 242. Rotating shaft; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0024] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided to make this application more comprehensive and complete, and to fully convey the concept of the exemplary embodiments to those skilled in the art.

[0025] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0026] In this application, unless otherwise expressly specified and limited, the terms "assembly," "connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0027] Furthermore, the described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a thorough understanding of embodiments of this application. However, those skilled in the art will recognize that the technical solutions of this application can be practiced without one or more of the specific details, or other methods, components, apparatuses, steps, etc., can be employed. In other instances, well-known methods, apparatuses, implementations, or operations are not shown or described in detail to avoid obscuring various aspects of this application.

[0028] See Figure 1As shown, this application embodiment provides a one-way screw 100, which includes a threaded shank 110 for engaging with a threaded hole in a product to achieve locking, and a screw head 120 having an anti-rotation structure 130.

[0029] In some embodiments of this application, see Figure 1 As shown, the anti-rotation structure 130 is compatible with standard tightening tools (such as flathead screwdrivers). When the tightening tool engages with the head and rotates along the first direction X (locking direction), the anti-rotation structure 130 can receive the torque transmitted by the tool and drive the screw to tighten. When the tightening tool rotates along the second direction Y (disassembly direction) opposite to the first direction X, the shape design of the anti-rotation structure 130 will cause the tool's cutting edge to slip, making it unable to transmit torque, thereby preventing third-party disassembly.

[0030] In some embodiments of this application, see Figure 1 As shown, the outer surface of the screw head 120 is adapted to make it in close contact with the blade 230 of the disassembly fixture 200 under pressure. When the blade 230 rotates in the second direction Y, the squeezing action between the two generates a force that drives the screw to rotate in the second direction Y, providing a basis for subsequent disassembly.

[0031] The screw head 120 has an anti-rotation structure 130, which is configured to transmit torque to tighten the screw when a tightening tool engages with it and rotates in a first direction X, and to cause the tool to slip and prevent torque transmission when the tightening tool rotates in a second direction Y. This design achieves the anti-disassembly function of the screw, while providing an operating interface for a dedicated disassembly tool.

[0032] In some embodiments of this application, see Figure 1 As shown, the anti-rotation structure 130 may include at least one protrusion 131 extending from the periphery of the screw head 120. This protrusion 131 provides a structural carrier for the anti-rotation function, enabling it to interact effectively with the tool.

[0033] For example, the screw head 120 may be provided with two symmetrically distributed protrusions 131 to ensure that when the tightening tool acts in the first direction X, it can stably bear the torque, while when it acts in the second direction Y, the contact mode between the protrusions 131 and the tool changes, so that the tool slips and the reliability of the anti-disassembly function is guaranteed.

[0034] In some embodiments of this application, see Figure 1As shown, each protrusion 131 has a first working surface 1310 and a second working surface 1311 on two opposing sides of the screw head 120 in the circumferential direction. The first working surface 1310 is a plane, and the angle design of this plane allows the cutting edge of a standard tightening tool to fully fit. When the tool rotates in the first direction X, it can efficiently transmit the torque required for tightening, such as driving the screw to be smoothly screwed into the product's threaded hole. The second working surface 1311 is an inclined surface. The inclination angle of the inclined surface has been calculated so that when the tightening tool rotates in the second direction Y and comes into contact with the inclined surface, the cutting edge of the tool will slide along the inclined surface, failing to form an effective force transmission point, thus slipping and ensuring the anti-disassembly effect.

[0035] The outer surface of the screw head 120 is configured to contact the blade 230 of the disassembly fixture 200 described below under pressure, and the rotational movement of the blade 230 in the second direction Y generates a force that drives the screw to rotate in the second direction Y. This disassembly fixture 200 effectively reduces the technical problem of the one-way screw 100 being difficult to remove during production and maintenance, providing a safe, efficient, and economical dedicated disassembly method.

[0036] See Figure 2 As shown in the figure, this application embodiment also provides a disassembly fixture 200, which includes a base 210, a pressure adjustment mechanism 220, a blade 230 and a rotary drive mechanism 240.

[0037] In some embodiments, see Figure 2 As shown, the base 210 can be made of cast iron or high-strength aluminum alloy, possessing sufficient mass and rigidity. Its bottom has mounting holes for bolting to the worktable. The upper part of the base 210 is machined with precise positioning grooves and clamp mounting positions for quick and reliable securing of the workpiece to be disassembled. This robust base design ensures that no unnecessary vibration or displacement occurs throughout the disassembly process.

[0038] It should be noted that, in order to achieve a stable support effect, the base 210 can also select screws or bolts of the corresponding specifications according to the weight of the tooling and the disassembly force requirements. The connection strength can be controlled by adjusting the tightening torque. This connection method can be adapted to various mounting surfaces such as flat surfaces and pre-set threaded holes. It is also detachable, which facilitates the subsequent relocation, maintenance and reuse of the tooling.

[0039] In some embodiments, see Figure 2 As shown, the pressure regulating mechanism 220 is mounted on the base 210. It can be used to drive the blade 230 to move in the third direction Z, so that it can contact the outer surface of the head of the one-way screw 100 and apply pressure. The pressure regulating mechanism 220 can achieve precise control of the contact pressure of the blade 230 on the one-way screw 100, providing the necessary conditions for effective disassembly.

[0040] In some embodiments, see Figure 2 As shown, the rotary drive mechanism 240 can be used to drive the blade 230 to rotate about its axis. The rotary drive mechanism 240 can drive the blade 230 to rotate together with it through circumferential rotation. This rotary mechanism provides the necessary rotational torque for the disassembly process and provides a power source for the one-way screw 100 to be removed.

[0041] Among them, see Figure 2 As shown, when the blade 230 contacts the outer surface of the screw head 120 under pressure and is driven to rotate along the second direction Y by the rotary drive mechanism 240, the blade 230 and the outer surface generate a force through compression that drives the one-way screw 100 to rotate along the second direction Y, thereby removing the screw. This disassembly fixture 200 effectively reduces the technical problem of the one-way screw 100 being difficult to remove during production and maintenance, providing a safe, efficient, and economical dedicated disassembly method.

[0042] Understandably, see Figure 3 As shown, the blade 230 can be made of metal. Since both the blade 230 and the outer surface of the screw head 120 are made of metal and have a certain hardness, they will generate a force through compression. This force can drive the one-way screw 100 to rotate in the second direction Y, and finally make the screw come out of the product.

[0043] In some embodiments, see Figure 2 As shown, the pressure regulating mechanism 220 may include a screw 221 extending in the third direction Z. The screw 221 is mounted on the base 210, and one end of it is rotatably connected to the base 210.

[0044] In some embodiments, see Figure 2 As shown, the pressure regulating mechanism 220 may also include a movable block 222. The movable block 222 has a threaded hole that matches the screw 221, and the two are connected by a threaded engagement.

[0045] In some embodiments, see Figure 2 As shown, the pressure regulating mechanism 220 may further include a first drive unit 223. The first drive unit 223 is a rocker arm, which is fixed to one end of the screw 221. When the rocker arm is rotated, it drives the screw 221 to rotate synchronously. The rotation of the screw 221 is converted into the movement of the moving block 222 along the third direction Z. The blade 230 is fixedly mounted on the moving block 222. The movement of the moving block 222 drives the blade 230 to move synchronously along the third direction Z, thereby adjusting the contact pressure between the blade 230 and the screw head 120.

[0046] In some embodiments, see Figure 2As shown, to ensure the smooth movement of the moving block 222 along the third direction Z, the pressure regulating mechanism 220 is also provided with at least one guide rod 224. The guide rod 224 is arranged parallel to the screw 221. One end of the guide rod 224 is connected and fixed to the base 210. The guide rod 224 passes through the moving block 222, and the moving block 222 can slide along the axial direction of the guide rod 224 to reduce the offset of the moving block 222 when it rotates with the screw 221, and ensure that the moving direction of the blade 230 is accurate and can always be aligned with the head of the one-way screw 100.

[0047] For example, the pressure regulating structure is also provided with two guide rods 224, which are respectively located on opposite sides of the screw 221 in the radial direction.

[0048] In some embodiments, see Figure 2 As shown, the rotary drive mechanism 240 may include a second drive unit 241 and a rotating shaft 242. The rotating shaft 242 extends along a third direction Z and is rotatably mounted on the movable block 222 via a structure such as bearings. The blade 230 is fixedly mounted on one end of the rotating shaft 242, and the other end of the rotating shaft 242 is connected to the second drive unit 241. The second drive unit 241 may be a rocker arm. When the rocker arm is rotated, the rocker arm drives the rotating shaft 242 to rotate around its own axis, and the rotating shaft 242 in turn drives the blade 230 to rotate synchronously, ensuring that the blade 230 can stably output rotational motion along the second direction Y, providing rotational power for screw removal.

[0049] In some embodiments, to reduce internal forces generated within the tooling during the disassembly of the one-way screw 100, the thread pitch of the moving block 222 cooperating with the screw 221 is set to be the same as the thread pitch of the one-way screw 100; simultaneously, a connecting threaded pair exists between the rotating shaft 242 and the moving block 222, and the thread pitch of this threaded pair is also the same as the thread pitch of the one-way screw 100. Thus, when the one-way screw 100 rotates out along the second direction Y, the components associated with the moving block 222 can rise synchronously with the withdrawal of the one-way screw 100, preventing internal forces from being generated within the tooling due to asynchronous movement and protecting the tooling structure from damage.

[0050] Understandably, when the one-way screw 100 rotates out, the moving block 222 can drive the blade 230 to follow synchronously at the same speed, always maintaining a constant contact pressure, effectively avoiding jamming or contact failure caused by asynchrony.

[0051] In some embodiments, see Figure 3As shown, the blade 230 in the disassembly fixture 200 is a planar block structure, and the material can be a high-strength metal to ensure sufficient hardness to withstand extrusion and rotational forces. On opposite sides perpendicular to the height direction of the threaded shank 110 of the one-way screw 100, the blade 230 has an arc-shaped structure 231 protruding from its own center as a symmetrical point. The arc-shaped structure 231 extends along the height direction of the threaded shank 110 of the one-way screw 100, which can increase the contact area between the blade 230 and the outer surface of the screw head 120, improve the stability of pressure transmission, and reduce the slippage of the blade 230 from the screw head 120 during rotation.

[0052] It should be noted that the top of the blade 230 is provided with a threaded hole, through which fasteners are passed to fix the blade 230 to the bottom of the rotating shaft 242.

[0053] In some embodiments, see Figure 2 As shown, the pressure regulating mechanism 220 may further include a fixed base 225 and a pad 226. The fixed base 225 is arranged opposite to and parallel to the base 210. The two ends of the screw 221 are connected to the base 210 and the fixed base 225 respectively, and the screw 221 passes through the fixed base 225 and is connected to the first drive part 223 (rocker). The two ends of the guide rod 224 are also connected to the base 210 and the fixed base 225 respectively. The fixed base 225 provides fixation and support for the screw 221 and the guide rod 224, further improving the overall stability of the pressure regulating mechanism 220. The pad 226 may be made of an elastic material (such as polyurethane) and is located on the side of the moving block 222 near the fixed base 225. It can buffer the moving block 222 when it contacts the fixed base 225, preventing hard contact from causing deformation of the moving block 222 and the fixed base 225.

[0054] It should be noted that the heads of both the blade 230 and the one-way screw 100 can be made of high-strength alloy, which can ensure that the necessary mechanical interference can be generated through extremely small elastic deformation during operation.

[0055] The working principle of this application is as follows: When the disassembly fixture 200 begins operation, the first drive unit 223 is operated first. Through the screw 221, the moving block 222 drives the blade 230 to slowly descend until the arc-shaped structure 231 at the tip of the blade 230 is in complete contact with the outer surface of the screw head 120. Pressure is then applied to create a predetermined contact pressure between the two, such as... Figure 2 and Figure 4 As shown.

[0056] Subsequently, the second drive unit 241 is operated, driving the blade 230 to rotate smoothly along the disassembly direction (second direction Y) via the rotating shaft 242. Due to the large normal pressure between the blade 230 and the surface of the screw head 120, and the proper matching of their hardness, a very small elastic deformation occurs in the contact area. This deformation, combined with relative motion, creates a strong mechanical interference effect, generating sufficient frictional torque. This torque is transmitted to the screw head 120 through the blade 230, forcing the one-way screw 100 to overcome the thread resistance and begin to rotate.

[0057] Throughout the disassembly process, the blade 230 maintains optimal contact with the screw head 120. As the screw gradually retracts, the moving block 222 drives the blade 230 to rise synchronously, automatically compensating for the screw's axial displacement and maintaining constant contact pressure. This dynamic balance ensures a smooth disassembly process, reduces impact loads, protects the tooling itself, and prevents damage to the workpiece.

[0058] This application effectively reduces the technical problem of the one-way screw 100 being difficult to remove during production and maintenance, and provides a safe, efficient and economical dedicated disassembly method. In the description of this specification, references to terms such as "some embodiments," "exemplarily," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. The illustrative expressions of the above terms in this specification do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0059] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application. Therefore, any changes or modifications made in accordance with the claims and description of this application should fall within the scope of this patent application.

Claims

1. A one-way screw, characterized in that, include: Threaded rod section; The screw head has an anti-rotation structure configured to transmit torque to tighten the screw when a tightening tool engages with it and rotates in a first direction; and to cause the tool to slip and prevent the transmission of torque when the tightening tool engages with it and rotates in a second direction opposite to the first direction. The outer surface of the screw head is configured to contact the blade of the disassembly tool under pressure, and the rotational movement of the blade in the second direction generates a force that drives the screw to rotate in the second direction.

2. The one-way screw according to claim 1, characterized in that, The anti-rotation structure includes at least one protrusion extending from the periphery of the screw head.

3. The one-way screw according to claim 2, characterized in that, The protrusion has a first working surface and a second working surface on two circumferentially opposite sides of the screw head, the first working surface being a plane suitable for transmitting tightening torque, and the second working surface being an inclined surface suitable for causing a standard tightening tool to slip.

4. A disassembly tool for the one-way screw according to any one of claims 1 to 3, characterized in that, include: Base; A pressure regulating mechanism is provided on the base; The blade, connected to the pressure regulating mechanism, moves upward in a third direction under the drive of the pressure regulating mechanism to contact the outer surface of the head of the one-way screw and apply pressure. A rotary drive mechanism for driving the blade to rotate about its axis; When the blade contacts the outer surface of the screw head under pressure and is driven to rotate in the second direction by the rotary drive mechanism, the blade and the outer surface generate a force through compression that drives the one-way screw to rotate in the second direction, thereby causing the screw to retract.

5. The disassembly fixture according to claim 4, characterized in that, The pressure regulating mechanism includes: A screw is disposed on the base and extends along the third direction; A movable block, which is threadedly engaged with the screw; The first driving unit is used to drive the screw to rotate, so as to move the moving block upward on the third party; The blade is mounted on the moving block.

6. The disassembly fixture according to claim 5, characterized in that, The pressure regulating mechanism further includes at least one guide rod, which is arranged parallel to the screw, passes through the moving block, and is connected to the base.

7. The disassembly fixture according to claim 5, characterized in that, The rotary drive mechanism includes a second drive unit and a rotating shaft. The rotating shaft extends upward from the third party and is rotatably mounted on the moving block. The blade is mounted on one end of the rotating shaft, and the second drive unit is used to drive the rotating shaft to rotate.

8. The disassembly fixture according to claim 7, characterized in that, The pitch of the thread that mates with the screw is equal to the pitch of the one-way screw; The pitch of the threaded pair connecting the rotating shaft and the moving block is equal to the pitch of the one-way screw.

9. The disassembly fixture according to claim 4, characterized in that, The blade has a planar block structure; Arc-shaped structures are provided on opposite sides perpendicular to the height direction of the threaded rod in a centrally symmetrical manner, and the arc-shaped structures extend along the height direction of the threaded rod.

10. The disassembly fixture according to claim 6, characterized in that, The movable block is equipped with a pad; The pressure regulating mechanism also includes a fixed seat, which is arranged opposite to and parallel to the base. The opposite ends of the screw and the guide rod are respectively connected to the base and the fixed seat, and the screw passes through the fixed seat.

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