Screw driving anti-drop tool
Patent Information
- Application Number
- CN202521958573.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-09-11
- Publication Date
- 2026-08-21
- Estimated Expiration
- 2035-09-11
AI Technical Summary
[0003]现有的小空间小螺丝拆除工具如棘轮、螺丝刀等，没有防脱落机构，容易发生螺丝脱落情况
本实用新型通过设置锁紧头用于夹持螺丝，如通过移动锁紧头调节组件，使得锁紧头与螺丝刀的刀头之间距离变大，待放入螺丝的大头放至锁紧头和螺丝刀的刀头之间后，在弹簧的弹力作用下，锁紧头与螺丝刀的刀头之间距离又变小，直至螺丝被压在螺丝刀的刀头上，这样就可以实现螺丝刀与螺丝一起下入到待安装位置，通过旋转螺丝刀的杆身，带动螺丝开始固定刀螺丝孔内以后，就可以再通过调节锁紧头调节组件，使得退出对螺丝的夹紧，这样就可以保证在安装过程螺丝不易脱落，同理反向操作，可以保证螺拆卸过程中不易脱落。
Smart Images
Figure CN224659297U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of maintenance tool technology, specifically a screw installation and removal tool to prevent screws from falling off. Background Technology
[0002] In our work, we occasionally encounter screws installed deep within spaces with significant depth, and where critical electrical components such as converters or reactors are located beneath them. It's crucial to ensure that screws don't fall into these components and cause damage, such as explosions. In confined spaces where hands cannot easily reach to install or remove screws, it's necessary to hold the screw upright and maintain some pressure when installing or removing it. While some screwdrivers have magnetic tips that can attract some screws, even a slight tremor of the hand can pose a significant risk, especially with screws in confined spaces or those with varying magnetic properties, heavy weights, or those that have been demagnetized.
[0003] Existing small-space screw removal tools such as ratchet wheels and screwdrivers lack anti-loosening mechanisms, making it easy for screws to fall off. Utility Model Content
[0004] The purpose of this utility model is to provide a screw installation and removal tool that prevents screws from falling off. It is suitable for removing and installing screws of various diameters, making it less likely for screws to fall off during installation and disassembly.
[0005] The objective of this utility model can be achieved through the following technical solutions: A screw-loading and unloading anti-drop tool includes a screwdriver, a locking head, a return spring, and a locking head adjustment assembly. The locking head adjustment assembly is connected to the screwdriver shaft, and the locking head is connected to the locking head adjustment assembly. The locking head can open to both sides or move away from the screwdriver shaft relative to the screwdriver tip via the locking head adjustment assembly, forming a space for clamping the screw between the locking head and the screwdriver tip. The locking head adjustment assembly and the screwdriver shaft are elastically connected by a return spring, which provides a return force for the locking head after it has opened or moved.
[0006] In a further embodiment, the locking head includes a Z-shaped rod, and the locking head adjustment assembly includes a first movable joint. The first movable joint is symmetrically connected to the screwdriver shaft. The other end of the Z-shaped rod is elastically connected to the screwdriver shaft via the return spring. The lower end of the Z-shaped rod is rotatably connected to the screwdriver shaft via the first movable joint. One end of the Z-shaped rod extends beyond the screwdriver tip. The two ends of the Z-shaped rod form a lever via the first movable joint. There are multiple Z-shaped rods and first movable joints, all evenly distributed relative to the screwdriver shaft. When one end of each of the multiple Z-shaped rods approaches each other, a space for clamping the screw is formed between them and the screwdriver tip.
[0007] In a further embodiment, the first movable joint includes a support base and a rotating shaft, the support base being connected to the shaft of the screwdriver, and the rotating shaft being rotatably connected within the support base.
[0008] In a further embodiment, the locking head includes a first L-shaped rod, and the locking head adjusting assembly includes teeth, a gear, and a first rod sleeve. The first rod sleeve is fitted onto the shaft of the screwdriver, and the first rod sleeve and the shaft of the screwdriver are elastically connected by the return spring. The teeth are disposed on the shaft of the screwdriver, and the gear is rotatably connected to the middle of the first rod sleeve and meshes with the teeth. The other end of the first L-shaped rod is connected to the teeth, and one end of the first L-shaped rod extends beyond the tip of the screwdriver. There are multiple first L-shaped rods, teeth, and gears, all evenly distributed relative to the shaft of the screwdriver. When one end of each of the multiple first L-shaped rods approaches each other, a space for clamping the screw is formed between them and the tip of the screwdriver.
[0009] In a further embodiment, the shaft of the gear is connected to a rotating shaft, the rotating shaft is rotatably connected within a support base, and the support base is disposed on the rod wall of the first rod sleeve.
[0010] In a further embodiment, the first sleeve has a first flange at the end away from the screwdriver tip, and the screwdriver shaft has a second flange near the first flange. The first flange and the second flange are elastically connected by the return spring.
[0011] In a further embodiment, the locking head includes a second L-shaped rod, and the locking head adjusting assembly includes a second rod sleeve. The second rod sleeve is fitted onto the shaft of the screwdriver, and the second rod sleeve and the shaft of the screwdriver are elastically connected by the return spring. One end of the second L-shaped rod extends beyond the tip of the screwdriver, and a U-shaped groove is provided at one end of the second L-shaped rod. The space for clamping the screw is formed between one end of the second L-shaped rod and the tip of the screwdriver. The other end of the second L-shaped rod is connected to the second rod sleeve.
[0012] In a further embodiment, the second sleeve has a first flange at the end away from the screwdriver tip, and the screwdriver shaft has a second flange near the first flange. The first flange and the second flange are elastically connected by the return spring.
[0013] In a further embodiment, the screwdriver shaft has an extension rod at the end away from the blade, and the extension rod has an adapter; the extension rod also has a handle.
[0014] In a further embodiment, the screwdriver head and the shaft are detachably connected.
[0015] The beneficial effects of this utility model are: This invention features a locking head for clamping screws. By adjusting the locking head, the distance between the locking head and the screwdriver tip increases. Once the larger end of the screw is placed between the locking head and the screwdriver tip, the spring force reduces the distance until the screw is pressed against the screwdriver tip. This allows the screwdriver and screw to be inserted together into the installation position. By rotating the screwdriver shaft, the screw is secured in the screw hole. The locking head adjustment component can then be adjusted to release the screw clamp, preventing it from falling out during installation. The reverse operation ensures the screw is not easily dislodged during disassembly.
[0016] This invention features a locking head with a Z-shaped rod structure and a locking head adjustment assembly with a first movable joint structure. Multiple Z-shaped rods can clamp the screw head by bringing their ends close together. By operating the other end of the Z-shaped rod, the clamping of the screw head can be released by levering the lever from left to right. This facilitates the clamping of the screw head from a distance, as it can be clamped and locked through one end of the Z-shaped rod. This allows the screw to be clamped and installed even when the hand cannot reach the screw mounting hole, preventing it from falling out.
[0017] This invention makes the locking head into a first L-shaped rod structure and the locking head adjustment component into a structure of teeth, gears, and a first rod sleeve. This eliminates the length of the other end of the Z-shaped rod, further reducing the operating space. This allows for adjustment of one end of the first L-shaped rod by bringing it closer to or away from the locking screw within a smaller operating space, through the rod sleeve, gears, and teeth.
[0018] This invention makes the locking head into a second L-shaped rod and sets a U-shaped groove on the second L-shaped rod. The screw head is clamped by the U-shaped groove. The locking head adjustment component is made into a second rod sleeve structure. By adjusting the distance between the rod sleeve and the screwdriver body, the distance between the screwdriver and the head of the second L-shaped rod is adjusted, thereby realizing the locking and loosening of the screw. This mechanism is simpler, and one end does not need the head of the second L-shaped rod to open or come close, which makes it easier to clamp and install the screw in a smaller operating space at one end. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is a schematic diagram of the screw installation and removal anti-drop tool in Embodiment 1 of this utility model; Figure 2 This is a schematic diagram of the screw installation and removal anti-drop tool in Embodiment 2 of this utility model; Figure 3 This is a schematic diagram of the screw installation and removal anti-drop tool in Embodiment 3 of this utility model; Figure 4 This is a schematic diagram of the screw installation and removal anti-drop tool in Embodiment 4 of this utility model; In the diagram: 1. Screwdriver; 2. Locking head; 3. Return spring; 4. Locking head adjustment assembly; 5. Z-shaped rod; 6. First movable joint; 7. Space; 8. Extension rod; 9. First L-shaped rod; 10. Toothed teeth; 11. Gear; 12. First rod sleeve; 13. Second L-shaped rod; 14. Second rod sleeve; 15. First flange; 16. Second flange; 17. Screw; 18. Screwdriver head; 19. Rod body; 20. Third L-shaped rod; 21. Second movable joint; 22. Third movable joint; 23. Fourth movable joint; 24. First connecting rod; 25. Second connecting rod; 26. Third rod sleeve. Detailed Implementation
[0021] 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 skilled in the art without creative effort are within the protection scope of the present utility model.
[0022] Example 1, such as Figure 1 As shown, the screw loading and unloading anti-drop tool includes a screwdriver 1, a locking head 2, a return spring 3, and a locking head adjustment assembly 4. The locking head adjustment assembly 4 is connected to the shaft 19 of the screwdriver 1, and the locking head 2 is connected to the locking head adjustment assembly 4. The locking head 2 can open to both sides or move away from the shaft 19 of the screwdriver 1 relative to the cutting head 18 of the screwdriver 1 through the locking head adjustment assembly 4, forming a space 7 for clamping the screw 17 between the locking head 2 and the cutting head 18 of the screwdriver 1. The locking head adjustment assembly 4 and the shaft 19 of the screwdriver 1 are elastically connected by the return spring 3, which provides a return force for the locking head 2 after it has opened or moved.
[0023] Its working principle is as follows: a locking head 2 is used to clamp the screw 17. By moving the locking head adjustment component 4, the distance between the locking head 2 and the cutting head 18 of the screwdriver 1 increases. After the large end of the screw 17 is placed between the locking head 2 and the cutting head 18 of the screwdriver 1, the distance between the locking head 2 and the cutting head 18 of the screwdriver 1 decreases again under the action of the spring force, until the screw 17 is pressed on the cutting head 18 of the screwdriver 1. In this way, the screwdriver 1 and the screw 17 can be lowered into the installation position together. By rotating the shaft 19 of the screwdriver 1, the screw 17 is driven to start to be fixed in the screw hole. After that, the locking head adjustment component 4 can be adjusted to release the clamping of the screw 17. This ensures that the screw 17 is not easy to fall off during the installation process. Similarly, the reverse operation can ensure that the screw is not easy to fall off during the disassembly process.
[0024] The locking head 2 includes a Z-shaped rod 5, and the locking head adjustment assembly 4 includes a first movable joint 6. The first movable joint 6 is symmetrically connected to the shaft 19 of the screwdriver 1. The other end of the Z-shaped rod 5 is elastically connected to the shaft 19 of the screwdriver 1 through a return spring 3. The lower end of the Z-shaped rod 5 is rotatably connected to the shaft 19 of the screwdriver 1 through the first movable joint 6. One end of the Z-shaped rod 5 extends beyond the tip 18 of the screwdriver 1. The two ends of the Z-shaped rod 5 form a lever through the first movable joint 6. There are multiple Z-shaped rods 5 and first movable joints 6, and they are all evenly distributed relative to the shaft 19 of the screwdriver 1. After one end of multiple Z-shaped rods 5 approaches each other, a space 7 for clamping the screw 17 is formed between them and the tip 18 of the screwdriver 1. Multiple Z-shaped rods 5 can clamp the large head of screw 17 by bringing one end close together. By operating the other end of the Z-shaped rods 5, the clamping of the large head of screw 17 can be released by levering the left and right sides. This makes it easy to clamp the large head of screw 17 from a distance. It can be clamped and locked through one end of the Z-shaped rods 5. In this way, when the hand cannot reach the mounting hole of screw 17, screw 17 can be clamped and installed through one end of the Z-shaped rods 5 to prevent it from falling.
[0025] The first movable joint 6 includes a support base and a rotating shaft. The support base is connected to the shaft 19 of the screwdriver 1, and the rotating shaft is rotatably connected inside the support base. This facilitates the installation of the locking head adjustment assembly 4.
[0026] In practical use, a replaceable screwdriver head is used. Different screwdriver heads are selected based on the size of the screw 17 on site. The support base of the first movable joint 6 is fixed to the screwdriver body 19, and the Z-shaped rod 5 is a one-piece design. Holding the other end of the Z-shaped rod 5 (its rear end) with one hand compresses the spring, opening the end near the screwdriver head 18, thus releasing the screw 17. When the rear end of the Z-shaped rod 5 is not gripped by the hand, only the spring expansion force moves the lever away from the screwdriver 1. According to the lever principle, the locking head 2 is stressed and firmly grips the screw 17. When it is necessary to open the locking head 2, both hands firmly grip the levers on both sides. The first movable joint 6 remains stationary on the screwdriver body, acting as a fulcrum similar to a lever.
[0027] Example 2, as Figure 2 As shown, based on Embodiment 1, the specific structure of the replacement locking head 2 is a first L-shaped rod 9, and the specific structure of the replacement locking head adjusting assembly 4 is a toothed thread 10, a gear 11, and a first rod sleeve 12. The first rod sleeve 12 is sleeved on the shaft 19 of the screwdriver 1. The first rod sleeve 12 and the shaft 19 of the screwdriver 1 are elastically connected by a return spring 3. The toothed thread 10 is set on the shaft 19 of the screwdriver 1. The gear 11 is rotatably connected to the middle of the first rod sleeve 12 and meshes with the toothed thread 10. The other end of the first L-shaped rod 9 is connected to the toothed thread 10. One end of the first L-shaped rod 9 extends out of the head 18 of the screwdriver 1. There are multiple first L-shaped rods 9, toothed threads 10, and gears 11, and they are all evenly distributed relative to the shaft 19 of the screwdriver 1. After one end of multiple first L-shaped rods 9 approaches each other, a space 7 for clamping the screw 17 is formed between them and the head 18 of the screwdriver 1.
[0028] By making the locking head 2 into the structure of the first L-shaped rod 9, and making the locking head adjusting assembly 4 into the structure of the toothed thread 10, the gear 11 and the first rod sleeve 12, the length of the other end of the Z-shaped rod 5 can be eliminated, which can further reduce the operating space 7. In a smaller operating space 7, the first L-shaped rod 9 can be adjusted by bringing one end of each first L-shaped rod close to the locking screw 17, and by using the rod sleeve, gear 11 and toothed thread 10 to move one end of the first L-shaped rod 9 closer to or further away from the locking screw 17.
[0029] The shaft of gear 11 is connected to a rotating shaft, which is rotatably connected within a support base. The support base is mounted on the rod wall of the first sleeve 12. This facilitates the installation of the locking head adjustment assembly 4.
[0030] The first sleeve 12 has a first flange 15 at the end away from the screwdriver head 18 of the screwdriver 1, and a second flange 16 is provided on the shaft 19 of the screwdriver 1 near the first flange 15. The first flange 15 and the second flange 16 are elastically connected by a return spring 3. This facilitates the installation of the return spring 3.
[0031] In practical use, the first sleeve 12 can move up and down relative to the screwdriver 1 body. When the first sleeve 12 is pressed down, the spring begins to bear force, and at the same time the first sleeve 12 moves upward relative to the screwdriver 1 body. The teeth 10 on the upper middle part of the first sleeve 12 give the gear 11 a counterclockwise rotation force. A small part of the tooth surface of the gear 11 is welded to the pressure rod at about 70°. The gear 11 has a stroke of nearly 160°. When the teeth 10 drive the gear 11 to rotate, the first L-shaped rod 9 rotates together at the same angle. When the first L-shaped rod 9 reaches the open position, it is used to clamp the screw 17. The spring is also pressed to the maximum position, that is, it cannot be pressed or has reached the maximum stroke. When it is released, the spring exerts force and pushes out the lower end of the inner sleeve of the screwdriver 1. The locking head 2 simultaneously holds the screw 17.
[0032] Example 3, as Figure 3 As shown, based on Embodiment 2, the specific structure of the replacement locking head 2 is a second L-shaped rod 13, and the specific structure of the replacement locking head adjusting assembly 4 is a second rod sleeve 14. The second rod sleeve 14 is sleeved on the shaft 19 of the screwdriver 1. The second rod sleeve 14 and the shaft 19 of the screwdriver 1 are elastically connected by a return spring 3. One end of the second L-shaped rod 13 extends out of the screwdriver head 18, and a U-shaped groove is provided at one end of the second L-shaped rod 13. A space 7 for clamping the screw 17 is formed between one end of the second L-shaped rod 13 and the screwdriver head 18. The other end of the second L-shaped rod 13 is connected to the second rod sleeve 14.
[0033] By adjusting the distance between the sleeve and the screwdriver 1 shaft 19, the distance between the screwdriver 1 and the head of the second L-shaped rod 13 can be adjusted, thereby achieving the locking and unlocking of the screw 17. This mechanism is simpler, as one end does not require the head of the second L-shaped rod 13 to open or approach, which makes it easier to clamp and install the screw 17 in a smaller operating space 7 at one end.
[0034] The second sleeve 14 has a first flange 15 at the end away from the screwdriver head 18 of the screwdriver 1, and a second flange 16 is provided on the shaft 19 of the screwdriver 1 near the first flange 15. The first flange 15 and the second flange 16 are elastically connected by a return spring 3. This facilitates the connection of the return spring 3.
[0035] In practical use, hold the second rod sleeve 14 and pull the screwdriver 1 rod 19 to the right to install the screw 17 into the U-shaped groove. Then release the screw, and the return spring 3 will spring back and press the screw 17 to lock it between the second L-shaped rod 13 and the screwdriver 1 tip 18, thus completing the installation of the screw 17. After it is installed in the hole, pull the screwdriver 1 rod 19 to the right again, and then move it to one side to pull the screw 17 out of the U-shaped hole. Then you can continue to install it with another extended screwdriver 1.
[0036] Example 4, as Figure 4As shown, based on Embodiment 2, the specific structure of the replacement locking head 2 is a third L-shaped rod 20, and the specific structure of the replacement locking head adjusting assembly 4 is a second movable joint 21, a third movable joint 22, a fourth movable joint 23, a first connecting rod 24, a second connecting rod 25, and a third rod sleeve 26. The third rod sleeve 26 is fitted onto the shaft 19 of the screwdriver 1. One end of the third rod sleeve 26 is connected to the first connecting rod 24. Both ends of the first connecting rod 24 are hinged to one end of the third L-shaped rod 20 through the second movable joint 21. The other end of the third L-shaped rod 20 extends beyond the tip 18 of the screwdriver 1. The middle part of the third L-shaped rod 20 near the other end is hinged to one end of the second connecting rod 25 through the third movable joint 22. The other end of the second connecting rod 25 is hinged to the end of the shaft 19 of the screwdriver 1 near the tip 18 through the fourth movable joint 23. The other end of the third rod sleeve 26 is elastically connected to the return spring 3.
[0037] When pressure is applied to the lower end of the screwdriver 1 shaft 19, the spring begins to store energy and bear force. The screwdriver tip 18 of the replaceable screw 17 moves away from the third sleeve 26, increasing the distance between the fourth movable joint 23 and the second movable joint 21. This causes the upper end of the third L-shaped rod 20 to retract, and the upper end of the third L-shaped rod 20 clamps the screw 17. When the hand is relaxed, the spring begins to regain its force, causing the inner sleeve of the screwdriver 1 to press downwards. The third movable joint 22 then moves in the opposite direction to open the end of the third L-shaped rod 20, releasing the clamping force.
[0038] In some implementations, such as Figure 3 As shown, if the installation length is insufficient, an extension rod 8 can be provided at the end of the screwdriver 1 shaft 19 away from the head 18, and an adapter can be provided on the extension rod 8; a handle can be provided on the extension rod 8 for easy hand holding.
[0039] In some implementations, the screwdriver 1's tip 18 and shaft 19 are detachably connected, which makes the screwdriver 1's tip 18 more versatile.
[0040] By referring to all the above diagrams, it can be seen that the length of screwdriver 1 can be extended, and the dimensions of all parts can be reasonably obtained according to the requirements.
[0041] It should be noted that the terms "first," "second," etc., used in this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein.
[0042] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," 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 the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0043] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model.
Claims
1. A screw installation and removal tool to prevent screws from falling off, characterized in that, The device includes a screwdriver (1), a locking head (2), a return spring (3), and a locking head adjustment assembly (4). The locking head adjustment assembly (4) is connected to the shaft (19) of the screwdriver (1). The locking head (2) is connected to the locking head adjustment assembly (4). The locking head (2) is opened to both sides or moved away from the shaft (19) of the screwdriver (1) relative to the cutting head (18) of the screwdriver (1) by the locking head adjustment assembly (4). A space (7) for clamping a screw (17) is formed between the locking head (2) and the cutting head (18) of the screwdriver (1). The locking head adjustment assembly (4) and the shaft (19) of the screwdriver (1) are elastically connected by the return spring (3). The return spring (3) is used to provide a return force for the locking head (2) after it is opened or moved.
2. The screw installation and removal anti-drop tool according to claim 1, characterized in that, The locking head (2) includes a Z-shaped rod (5), and the locking head adjustment assembly (4) includes a first movable joint (6). The first movable joint (6) is symmetrically connected to the shaft (19) of the screwdriver (1). The other end of the Z-shaped rod (5) is elastically connected to the shaft (19) of the screwdriver (1) through the return spring (3). The lower end of the Z-shaped rod (5) is rotatably connected to the shaft (19) of the screwdriver (1) through the first movable joint (6). One end of the Z-shaped rod (5) extends to the outside of the tip (18) of the screwdriver (1). The two ends of the Z-shaped rod (5) form a lever through the first movable joint (6). There are multiple Z-shaped rods (5) and first movable joints (6), and they are all evenly distributed relative to the shaft (19) of the screwdriver (1). After one end of multiple Z-shaped rods (5) approaches each other, they form the space (7) for clamping the screw (17) between the screwdriver (1) and the tip (18).
3. The screw installation and removal anti-drop tool according to claim 2, characterized in that, The first movable joint (6) includes a support base and a rotating shaft. The support base is connected to the shaft (19) of the screwdriver (1), and the rotating shaft is rotatably connected inside the support base.
4. The screw installation and removal anti-drop tool according to claim 1, characterized in that, The locking head (2) includes a first L-shaped rod (9), and the locking head adjusting assembly (4) includes a toothed thread (10), a gear (11), and a first rod sleeve (12). The first rod sleeve (12) is fitted onto the shaft (19) of the screwdriver (1). The first rod sleeve (12) and the shaft (19) of the screwdriver (1) are elastically connected by the return spring (3). The toothed thread (10) is provided on the shaft (19) of the screwdriver (1), and the gear (11) is rotatably connected to the first rod sleeve (12). The first L-shaped rod (9) is connected to the toothed pattern (10) at one end and the other end of the first L-shaped rod (9) extends out of the head (18) of the screwdriver (1). There are multiple first L-shaped rods (9), teeth (10) and gears (11), and they are all evenly distributed relative to the shaft (19) of the screwdriver (1). After one end of multiple first L-shaped rods (9) approaches each other, they form the space (7) for clamping the screw (17) between the screwdriver (1) head (18) and the head (18) of the screwdriver (1).
5. The screw installation and removal anti-drop tool according to claim 4, characterized in that, The shaft of the gear (11) is connected to the rotating shaft, which is rotatably connected in the support seat, which is set on the rod wall of the first rod sleeve (12).
6. The screw installation and removal anti-drop tool according to claim 5, characterized in that, The first sleeve (12) has a first flange (15) at the end away from the screwdriver (1) tip (18), and the screwdriver (1) has a second flange (16) near the first flange (15) on the shaft (19). The first flange (15) and the second flange (16) are elastically connected by the return spring (3).
7. The screw installation and removal anti-drop tool according to claim 1, characterized in that, The locking head (2) includes a second L-shaped rod (13), and the locking head adjusting assembly (4) includes a second rod sleeve (14). The second rod sleeve (14) is fitted onto the shaft (19) of the screwdriver (1). The second rod sleeve (14) and the shaft (19) of the screwdriver (1) are elastically connected by the return spring (3). One end of the second L-shaped rod (13) extends out of the tip (18) of the screwdriver (1), and a U-shaped groove is provided at one end of the second L-shaped rod (13). The space (7) for clamping the screw (17) is formed between one end of the second L-shaped rod (13) and the tip (18) of the screwdriver (1). The other end of the second L-shaped rod (13) is connected to the second rod sleeve (14).
8. The screw installation and removal anti-drop tool according to claim 7, characterized in that, The second sleeve (14) has a first flange (15) at the end away from the screwdriver (1) tip (18), and the screwdriver (1) shaft (19) is provided with a second flange (16) near the first flange (15). The first flange (15) and the second flange (16) are elastically connected by the return spring (3).
9. The screw installation and removal anti-drop tool according to claim 1, characterized in that, The screwdriver (1) has an extension rod (8) at one end of its shaft (19) away from the blade (18), and the extension rod (8) has an adapter; the extension rod (8) has a handle.
10. The screw installation and removal anti-drop tool according to claim 1, characterized in that, The screwdriver (1) has a detachable connection between the blade (18) and the shaft (19).