A screw removal tool

Abstract

This utility model discloses a screw removal tool, belonging to the technical field of removal tools. It includes: two symmetrically arranged frames, one end of which is equipped with a traction mechanism. Bolts are mounted on the traction mechanism and are detachably inserted into the connection holes of a screw cover plate; and an installation mechanism that is movably engaged between the two frames. During the removal of stripped screws, this screw removal tool utilizes the coordinated operation of the frames, traction mechanism, installation mechanism, and tool assembly to enable the tool's cutting edge to adaptively align with the screw axis and apply force evenly along the axial direction. The adjustable preload provided by the traction mechanism continuously presses the tool against the screw end face, thereby efficiently converting the torque applied by the wrench into rotational force. This avoids problems such as free rotation caused by stripping in traditional disassembly, achieving a smooth, labor-saving, safe, and convenient disassembly process.

Description

Technical Field

[0001] This utility model specifically relates to a screw removal tool, belonging to the technical field of removal tools. Background Technology

[0002] Screws are widely used in various industries. Screws are generally used to connect two objects. Screw removal is the process of removing screws that have been tightened on an object by rotating, prying, or other means, so as to separate the screws from the fixed part.

[0003] Screws are typically used to securely fasten two parts together. However, when the end of a screw—the part where a screwdriver or socket engages—becomes stripped (commonly known as "stripped") due to repeated disassembly and reassembly, excessive force, or insufficient material hardness, traditional removal tools struggle to transmit torque. A common problem is that the screwdriver tip spins freely in the groove, damaging both the screw and the tool itself. Using pliers to grip the outer diameter is often insufficient due to space constraints. Another method is to weld the tool to the stripped screw, but welding is not feasible in explosion-proof areas and is also wasteful. The resulting technical challenge is how to achieve stable and controllable torque transmission to the stripped end of a screw within a confined space, thus enabling reliable removal. Utility Model Content

[0004] The purpose of this utility model is to address the shortcomings of existing technologies by providing a screw removal tool that achieves high sensitivity and better information collection.

[0005] A screw removal tool, comprising:

[0006] Two symmetrically arranged frames are provided, with a traction mechanism installed at one end of each frame. Bolts are installed on the traction mechanism and are detachably inserted into the connection holes of a screw cover plate. An installation mechanism is movably engaged between the two frames. A wrench for applying torque to the installation mechanism is connected to the upper side of the installation mechanism, and a tool assembly for unscrewing and removing stripped screws is connected to the lower side of the installation mechanism. The traction mechanism is used to press the tool assembly between the frame and the screw cover plate, so that the wrench generates a smooth removal torque on the stripped screw when rotated.

[0007] Furthermore, both frames are provided with multiple locking positions at equal intervals on the side facing the ground, which are used to form a multi-point adjustable locking and positioning with the installation mechanism.

[0008] Furthermore, the traction mechanism includes:

[0009] A screw rod is used to connect the two frame bodies. Two steel wire ropes are wound on the screw rod, and one end of each steel wire rope is installed on the frame body.

[0010] The C-shaped seat has two sides connected to the other ends of the two steel wire ropes, and the bolts are inserted and installed on the C-shaped seat.

[0011] Furthermore, the mounting mechanism includes:

[0012] The outer ring is disposed between the two frames, and rotating rods are symmetrically fixed on both sides of the outer ring and rotated and engaged in the engagement position. The inner ring of the outer ring is tapered.

[0013] A rotating assembly that rotates on the inner ring of the outer ring.

[0014] Furthermore, the rotating assembly includes:

[0015] The inner ring is conical and coaxially rotatable within the inner cavity of the outer ring. Rollers are provided between the outer conical surface of the inner ring and the inner wall of the outer ring, forming a rolling support to allow the inner ring to rotate freely relative to the outer ring.

[0016] An internal hex socket is fixed to one side above the inner ring and is used to cooperate with the wrench to transmit torque.

[0017] An inner four-corner sleeve is fixed to the lower side of the inner ring and is used to insert the tool assembly.

[0018] Furthermore, the wrench is a hexagonal wrench, which is adapted to be inserted into the internal hexagonal socket.

[0019] Furthermore, the cutting tool assembly is a cutting head, and the tail of the cutting head is fitted and inserted into the inner four corner sleeve.

[0020] Beneficial effects:

[0021] In the process of removing stripped screws, this utility model utilizes the coordinated operation of the frame, traction mechanism, installation mechanism, and tool assembly to enable the cutting edge of the tool to adaptively align with the screw axis and apply force evenly along the axial direction. The adjustable preload provided by the traction mechanism continuously presses the tool against the screw end face, thereby efficiently converting the torque applied by the wrench into rotational force. This avoids problems such as free rotation caused by stripping in traditional disassembly, achieving the technical effect of a smooth, labor-saving, safe, and convenient disassembly process. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the overall structure of this utility model from a bottom view;

[0024] Figure 3 This is a schematic diagram of the frame and traction mechanism of this utility model;

[0025] Figure 4 This is a schematic diagram of the structure of the frame of this utility model;

[0026] Figure 5 This is a schematic diagram of the installation mechanism and the cutting tool assembly of this utility model;

[0027] Figure 6 This is a schematic diagram of the traction mechanism of this utility model;

[0028] Figure 7 This is a schematic diagram of the installation mechanism of this utility model;

[0029] Figure 8 This is an exploded structural diagram of the installation mechanism of this utility model;

[0030] Figure 9 This is a schematic diagram of the tool assembly of this utility model.

[0031] In the diagram: 1. Frame; 2. Clamping position; 3. Screw; 4. Wire rope; 5. C-shaped seat; 6. Bolt; 7. Outer ring; 8. Rotating rod; 9. Inner ring; 10. Socket socket; 11. Square socket; 12. Hex wrench; 13. Cutting head. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0033] Please see Figure 1-9 As shown, a screw removal tool includes:

[0034] Two symmetrically arranged frame bodies 1 are provided, with a traction mechanism installed at one end of each frame body 1. Bolts 6 are provided on the traction mechanism and are detachably inserted into the connection holes of the screw cover plate. An installation mechanism is movably engaged between the two frame bodies 1. A wrench for applying torque to the installation mechanism is connected to one side above the installation mechanism, and a tool assembly for unscrewing and removing stripped screws is connected to one side below the installation mechanism. The traction mechanism is used to press the tool assembly between the frame body 1 and the screw cover plate, so that the wrench generates a smooth removal torque on the stripped screw when rotated.

[0035] In this implementation, two symmetrically arranged frame bodies 1 span across the screw cover plate. The traction mechanism at one end of the frame body 1 is temporarily and repeatedly fastened to the original connection holes on the cover plate by bolts 6. It should be noted that bolts 6 are bolts on the screw cover plate that have not stripped their threads, which are used for temporary fixation of the device, so that bolts are not required on the device. The other end of the frame body 1 is pressed by the operator, which, in conjunction with the traction mechanism, the installation mechanism and the tool assembly, enables the frame body 1 to press down on the tool assembly, thereby providing a stable reaction force fulcrum for the entire demolition operation. The installation mechanism is movably locked between the two frame bodies 1 and can float slightly on the frame body 1 so that the tool assembly can automatically align with the central axis of the stripped screw during initial positioning.

[0036] The wrench extends upwards, allowing the operator to apply continuous and controllable torque with one or both hands in confined spaces. The cutting tool assembly is firmly pressed between the frame 1 and the screw cover plate under the pre-tightening action of the traction mechanism. By hammering the cutting tool assembly before the traction mechanism is installed, a groove is created at the tail of the screw for the cutting head to engage with. As the wrench slowly rotates, the cutting edge of the cutting tool gradually bites into the groove. As the torque gradually increases, the stripped screw is smoothly, continuously, and almost without lateral wobbling. The reaction force is directly transmitted from the bolt 6 to the cover plate through the traction mechanism, avoiding the risk of prying or deforming surrounding parts. The entire process requires no additional heat source or chemical agent, preserving the integrity of the original threaded hole and significantly reducing the disassembly scrap rate.

[0037] Please see Figure 4 As a technical optimization of this utility model, multiple locking positions 2 are equally spaced on the side of the two frames 1 facing the ground. The locking positions 2 are used to form a multi-point adjustable locking and positioning with the installation mechanism.

[0038] In this implementation, multiple locking positions 2, which are equally spaced along the length of the two frames 1 facing the ground, form an invisible toothed rail. The mounting mechanism is provided with a latch that complements the contour of the locking position 2. When the operator needs to adjust the vertical position of the tool assembly according to the thickness of the screw cover plate or the depth of the stripped screw, he only needs to push the mounting mechanism lightly so that the latch slides through several locking positions 2 and then re-engages, thus achieving position adjustment.

[0039] Please see Figure 6 As a technical optimization of this utility model, the traction mechanism includes:

[0040] Screw 3, the screw 3 is used to connect the two frame bodies 1, and two steel wire ropes 4 are wound on the screw 3, with one end of the two steel wire ropes 4 installed on the frame body 1;

[0041] C-shaped seat 5, the two sides of the C-shaped seat 5 are connected to the other ends of the two steel wire ropes 4, and the bolts 6 are inserted and installed on the C-shaped seat 5.

[0042] In this implementation, the screw 3 runs across the upper ends of the two frames 1, forming a rigid crossbeam. Two steel wire ropes 4 wound on the crossbeam extend downwards diagonally, passing through guide holes in the side walls of the frame 1, and are anchored to the lower edge of the frame 1 in an equal and symmetrical manner. This cross-winding method ensures that when the screw 3 is slightly tightened, the steel wire ropes 4 shorten proportionally, thereby generating a uniform and precisely controllable tension between the C-shaped seat 5 and the frame 1. The open end of the C-shaped seat 5 wraps around the outer edge of the screw cover plate, and its two side lugs are connected to the ends of the steel wire ropes 4 through quick-release pins. The bolt 6 passes through the bottom plate of the C-shaped seat 5 and connects to the end of the steel wire rope 4. The original connecting holes on the screw cover plate form a rigid connection, further transmitting the traction force directly to the cover plate. This ensures that the tool assembly is always stably pressed against the end face of the stripped screw during the application of force by the wrench, ensuring that the torque is transmitted along the axis without eccentric swaying. The frame 1 at the end away from the traction mechanism can be manually supported by the operator. By using the tool assembly as the center and coordinating with the traction mechanism, the tool assembly can be pressed down. As the stripped screw is disassembled, the frame 1 at the hand-held end can be lifted up, coordinating with the lifting and disassembly movement of the screw. Therefore, the entire traction mechanism has the advantages of adjustable tension, quick disassembly and assembly, and uniform force distribution.

[0043] Please see Figure 7 and Figure 8 As a technical optimization of this utility model, the installation mechanism includes:

[0044] Outer ring 7, the outer ring 7 is disposed between the two frame bodies 1, and rotating rods 8 are symmetrically fixed on both sides of the outer ring 7 and rotatedly engaged in the engagement position 2. The inner ring of the outer ring 7 is tapered.

[0045] A rotating assembly that rotates on the inner ring of the outer ring 7.

[0046] The rotating assembly includes:

[0047] The inner ring 9 is conical and coaxially rotatable within the inner cavity of the outer ring 7. Rollers are provided between the outer conical surface of the inner ring 9 and the inner wall of the outer ring 7, and the rollers constitute a rolling support so that the inner ring 9 can rotate freely relative to the outer ring 7.

[0048] The internal hex socket 10 is fixed to one side above the inner ring 9 and is used to cooperate with the wrench to transmit torque.

[0049] The inner four-corner sleeve 11 is fixed to the lower side of the inner ring 9 and is used to insert the tool assembly.

[0050] In this implementation, the outer ring 7 forms a rolling pair with the frame 1 by means of the rotating rods 8 extending symmetrically on both sides and the engagement position 2, so that the outer ring 7 as a whole can swing slightly in the horizontal plane to compensate for the small positional error of the cover plate or screw.

[0051] The conical surface of its inner ring and the rollers on the outer surface of the conical inner ring 9 form a self-centering sliding fit. When the wrench transmits torque downward through the internal hexagonal socket 10, the inner ring 9 rotates and is automatically lowered by the lateral force of the conical surface. This causes the tool assembly inserted in the internal square socket 11 to gradually press against the end face of the stripped screw, achieving radial self-centering and axial synchronous feed. During rotation, the conical contact surface undertakes radial positioning, ensuring that the cutting edge of the tool always remains coaxial with the screw axis. The torque is transmitted without loss through the rigid channel of internal hexagonal socket 10—inner ring 9—internal square socket 11—tool assembly, ultimately causing the stripped screw to disengage from the screw hole in a smooth and continuous axial pull-out motion. The entire process requires no additional clamping or hammering, making the operation safe, labor-saving, and without damage to the surrounding structure.

[0052] Please see Figure 5 As a technical optimization of this utility model, the wrench is a hexagonal wrench 12, and the hexagonal wrench 12 is adapted to be inserted into the internal hexagonal socket 10.

[0053] In this implementation, the handle of the hex wrench 12 is directly inserted into the internal hex socket 10, with their contours completely fitting together. This not only eliminates transmission gaps but also allows for the transmission of maximum torque with the shortest lever arm in a confined space. When the operator rotates the hex wrench 12, its hexagonal surface contacts the six force-bearing surfaces of the internal hex socket 10 simultaneously, resulting in uniform stress distribution and preventing micro-slippage or chipping due to local overload. The ball end of the hex wrench 12 can also be slightly tilted, allowing the wrench to maintain continuous rotation even when restricted by the outer edge of the cover plate. This ensures that a smooth and controllable torque is transmitted through the internal hex socket 10, inner ring 9, and internal square socket 11 to the tool assembly, ultimately achieving reliable removal of stripped screws.

[0054] Please see Figure 9 As a technical optimization of this utility model, the cutting tool assembly is a cutting head 13, and the tail of the cutting head 13 is adapted to be inserted into the inner four corner sleeve 11.

[0055] In this implementation, the tip of the cutter head 13 is inserted into the inner four-corner sleeve 11 with a precise four-sided prism profile, forming a zero-gap torque coupling. This ensures that there is no idle loss when the wrench is applied, and also allows the cutter head 13 to be quickly pulled out when it needs to be replaced. The other end of the cutter head 13 is provided with a cutting edge, which is milled into a multi-bladed cone shape according to the shape of the tail of a common stripped screw. It can bite into the residual groove wall after slight tapping or pre-pressing. With the help of the continuous rotation of the hexagonal wrench 12, the circumferential force is smoothly converted into axial pulling force, so as to remove the stripped screw completely without enlarging the hole diameter or splashing debris.

[0056] It is worth noting that the screw 3 runs horizontally between the two frames 1, with two steel wire ropes 4 symmetrically wound around it. One end of the steel wire rope 4 passes through the guide hole on the side wall of the frame 1 and is anchored to the lower edge of the frame 1. The steel wire rope 4 first wraps around the screw 3 several times and then extends downwards, with its end connected to both sides of the C-shaped seat 5. The C-shaped seat 5 is screwed into the remaining screw hole on the screw cover plate by bolts 6. One end of the frame 1 is pulled by the traction mechanism, and the other end is held by the operator. At this time, the steel wire rope 4 forms a pre-tension path. When the steel wire rope 4, together with the operator's hand, presses down to press the frame 1 tightly onto the rotating rod 8, The tool assembly is pressed onto the stripped screw through the cooperation of the rotating rod 8 and the frame 1. As the stripped screw is continuously unscrewed, the frame 1 will continuously rise. At this time, the hand-held part of the frame 1 is raised with the lifting, while the height of the frame 1 at one end of the traction mechanism remains unchanged. Because the installation mechanism can rotate slightly on the frame 1, it can ensure the tension while also meeting the displacement requirements of the tool assembly when disassembling the stripped screw. This ensures that the tool assembly is always in close contact with the screw end face, and also allows the screw to maintain sufficient support during axial displacement, thus achieving a smooth and continuous disassembly operation.

[0057] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0058] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A screw removal tool, characterized in that, include: Two symmetrically arranged frames (1) are provided, with a traction mechanism installed at one end of each frame (1). Bolts (6) are provided on the traction mechanism and are detachably inserted into the connection holes of the screw cover plate. An installation mechanism is movably engaged between the two frames (1). A wrench for applying torque to the installation mechanism is connected to one side above the installation mechanism, and a tool assembly for unscrewing and removing stripped screws is connected to one side below the installation mechanism. The traction mechanism is used to press the tool assembly between the frame (1) and the screw cover plate so that the wrench generates a smooth removal torque on the stripped screw when it rotates.

2. The screw removal tool of claim 1, wherein: The two frames (1) are provided with multiple locking positions (2) at equal intervals on the side facing the ground. The locking positions (2) are used to form a multi-point adjustable locking and positioning with the installation mechanism.

3. The screw removal tool of claim 1, wherein: The traction mechanism includes: A screw (3) is used to connect two of the frame bodies (1). Two steel wire ropes (4) are wound on the screw (3), and one end of the two steel wire ropes (4) is installed on the frame body (1). C-shaped seat (5), the two sides of the C-shaped seat (5) are connected to the other ends of the two steel wire ropes (4), and the bolts (6) are inserted and installed on the C-shaped seat (5).

4. The screw removal tool of claim 2, wherein: The installation mechanism includes: Outer ring (7), the outer ring (7) is set between the two frames (1), and rotating rods (8) are symmetrically fixed on both sides of the outer ring (7) and rotated and engaged in the engagement position (2). The inner ring of the outer ring (7) is conical. A rotating assembly that rotates on the inner ring of the outer ring (7).

5. The screw removal tool of claim 4, wherein: The rotating assembly includes: The inner ring (9) is conical and coaxially rotatable in the inner cavity of the outer ring (7). Rollers are provided between the outer conical surface of the inner ring (9) and the inner wall of the outer ring (7). The rollers form a rolling support so that the inner ring (9) can rotate freely relative to the outer ring (7). Hex socket (10), which is fixed to the upper side of the inner ring (9) and is used to cooperate with the wrench to transmit torque; An inner four-corner sleeve (11) is fixed to the lower side of the inner ring (9) and is used to insert the tool assembly.

6. The screw removal tool of claim 5, wherein: The wrench is a hexagonal wrench (12), which is adapted to be inserted into the internal hexagonal socket (10).

7. The screw removal tool of claim 5, wherein: The cutting tool assembly is a cutting head (13), and the tail of the cutting head (13) is adapted to be inserted into the inner four corner sleeve (11).

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