A screwdriver head anti-loosening device

Abstract

The utility model provides a kind of electric screwdriver head anti-loosening device, including a character batch head and the positioning sleeve of the character batch head outside set, the character batch head is located in the middle part of positioning sleeve, the outer periphery of positioning sleeve is provided with at least three arc baffles of surrounding distribution.In the utility model, at least three arc baffles are arranged around the outer periphery of positioning sleeve, arc baffle and the outer wall of positioning sleeve are rotatably connected, the outer sleeve of positioning sleeve is set sliding ring, sliding ring is connected by link and the top hinged connection of arc baffle, the driving sleeve above sliding ring is set on positioning sleeve, driving sleeve and positioning sleeve screw connection, when rotating driving sleeve and making it move downward, it will push sliding ring to drop, at this time, the diameter of the circle where the bottom end of at least three arc baffles is located reduces, therefore, compared with prior art, the setting has the advantage that the screw head of different outer diameter is prevented from falling off and limited to switch operation more conveniently.

Description

Technical Field

[0001] This utility model relates to the field of screw assembly technology, specifically to an anti-loosening device for electric screwdriver bits. Background Technology

[0002] Installing or removing screws with an electric screwdriver is a common operation in mechanical assembly. For slotted screws, a slotted electric screwdriver is usually used for installation or removal. However, since there is no limit along the slot, the screwdriver bit often comes loose from the screw during installation or removal, which reduces the operator's work efficiency and may even scratch the surface of the parts, causing cosmetic damage. More seriously, it may pose a risk of injury to personnel.

[0003] Utility model CN219666445U discloses a device to prevent the flathead screwdriver bit from loosening. The device includes a restraining component, a main body, and a sleeve. A plurality of claws are spaced apart at one end of the main body. The restraining component wraps around the claws and is fixed to one end of the main body. One end of the sleeve is fixed to the other end of the main body, and the other end of the sleeve has an anti-slip ring. The restraining component, the main body, and the sleeve all have channels running through them along their respective axes. This utility model solves the problem of the flathead screwdriver bit frequently detaching from the screw when installing or removing flathead screws using a flathead screwdriver. This improves the operator's work efficiency, avoids the risk of scratching the surface of parts by the screwdriver bit, and protects the operator's safety.

[0004] However, the aforementioned existing technology still has shortcomings in use: the anti-loosening device in the aforementioned existing technology is equipped with an anti-slip ring, which is a ring structure with a fixed inner diameter. That is to say, the anti-loosening device can only prevent the screw head of a slotted screw of one outer diameter from coming loose. In actual assembly operations, there are often a large number of slotted screws with different outer diameters. In order to prevent the slotted screws with different outer diameters from coming loose, it is necessary to frequently replace the anti-loosening device of other specifications, which is time-consuming and affects work efficiency.

[0005] Therefore, this utility model provides a device to prevent electric screwdriver bits from loosening. Utility Model Content

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide an anti-loosening device for electric screwdriver bits to solve the problems mentioned in the background art. This utility model has the advantage of making the anti-loosening limit switching operation of screw bits with different outer diameters more convenient and faster.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an anti-loosening device for an electric screwdriver bit, comprising a flathead screwdriver bit and a positioning sleeve fitted around the flathead screwdriver bit. The flathead screwdriver bit is located in the middle of the positioning sleeve. At least three arc-shaped baffles are arranged around the outer periphery of the positioning sleeve. The arc-shaped baffles and the outer wall of the positioning sleeve are rotatably connected, and their rotation axes are perpendicular to and do not intersect with the axis of the positioning sleeve. A slip ring is fitted around the outside of the positioning sleeve, located above the arc-shaped baffles. The top end of the arc-shaped baffles is hinged to the outer periphery of the slip ring via a connecting rod. When the slip ring moves downward, the bottom end of the arc-shaped baffles moves towards the axis of the positioning sleeve. A drive sleeve is fitted around the outside of the positioning sleeve, located above the slip ring. The drive sleeve and the positioning sleeve are screwed together.

[0008] Furthermore, the arc-shaped baffle is S-shaped and its plane coincides with the axis of the positioning sleeve, and the lower part of the arc-shaped baffle bends towards the axis of the positioning sleeve.

[0009] Furthermore, a U-shaped seat is welded to the outer peripheral wall of the positioning sleeve, and a positioning shaft is fixedly connected to the surface of the arc-shaped baffle near the top. The positioning shaft is located inside the U-shaped seat and coaxial connecting shafts are welded to both ends of it. The U-shaped seat is provided with positioning holes that transition with the connecting shafts.

[0010] Furthermore, the positioning sleeve is externally fixedly fitted with a retaining ring located below the slip ring, and the positioning sleeve is externally fitted with a support spring located between the retaining ring and the slip ring.

[0011] Furthermore, at least one support rod is fixedly connected to the bottom wall of the drive sleeve, and the upper end face of the slip ring is provided with circumferentially evenly distributed spherical grooves, the diameter of which is larger than the outer diameter of the support rod.

[0012] Furthermore, the outer peripheral wall of the drive sleeve is fixedly connected with circumferentially evenly distributed resistance-increasing strips.

[0013] Furthermore, the inner diameter of the slip ring is the same as the outer diameter of the positioning sleeve.

[0014] Furthermore, a polygonal block is fixedly fitted on the outside of the flathead screwdriver bit, and a limiting platform is fixedly fitted inside the positioning sleeve. A polygonal hole adapted to the polygonal block is opened through the platform surface of the limiting platform, and a countersunk hole communicating with the polygonal hole is opened on the outer peripheral wall of the positioning sleeve. A locking screw is screwed into the countersunk hole.

[0015] The beneficial effects of this utility model are as follows:

[0016] 1. In this utility model, at least three arc-shaped baffles are arranged around the outer periphery of the positioning sleeve. The arc-shaped baffles are rotatably connected to the outer wall of the positioning sleeve. A slip ring is fitted on the outside of the positioning sleeve. The slip ring is hinged to the top of the arc-shaped baffles through a connecting rod. A drive sleeve is fitted on the positioning sleeve above the slip ring. The drive sleeve and the positioning sleeve are screwed together. When the drive sleeve is rotated to move downward, it will push the slip ring down. At this time, the diameter of the circle where the bottom ends of the at least three arc-shaped baffles are located is reduced. Therefore, compared with the prior art, this arrangement has the advantage of making the anti-dislodgement limit switching operation of screw heads with different outer diameters more convenient.

[0017] 2. In this utility model, a retaining ring is fixedly sleeved outside the positioning sleeve and located below the slip ring. A support spring is set between the retaining ring and the slip ring. When the drive sleeve is turned, the slip ring will move up and down adaptively under the elastic force of the support spring. At this time, the bottom ends of at least three arc-shaped baffles are in a state of synchronous linkage. This setting facilitates the quick docking of the arc-shaped baffles and the screw head of the slotted screw.

[0018] 3. In this utility model, a circumferentially evenly distributed spherical groove is opened on the upper end surface of the slip ring, and a support rod that can enter the spherical groove is welded to the bottom of the drive sleeve. This arrangement enables the drive sleeve to have an anti-loosening function after adjustment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of an anti-loosening device for electric screwdriver bits according to the present invention;

[0020] Figure 2 for Figure 1 A diagram at the bottom;

[0021] Figure 3 for Figure 1 A diagram showing the aftermath of the explosion.

[0022] In the diagram: 1. Flathead screwdriver bit; 11. Polygonal block; 2. Positioning sleeve; 21. U-shaped seat; 211. Positioning hole; 22. Retaining ring; 23. Limiting platform; 231. Polygonal hole; 24. Countersunk hole; 3. Arc-shaped baffle; 31. Positioning shaft; 311. Connecting shaft; 4. Slip ring; 41. Spherical groove; 5. Connecting rod; 6. Drive sleeve; 61. Support rod; 62. Resistance bar; 7. Support spring; 8. Locking screw. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0024] Please see Figures 1 to 3This utility model provides a technical solution: an anti-loosening device for electric screwdriver bits, including a flathead screwdriver bit 1 and a positioning sleeve 2 sleeved on the outside of the flathead screwdriver bit 1. The flathead screwdriver bit 1 is located in the middle of the positioning sleeve 2. The flathead screwdriver bit 1 and the positioning sleeve 2 are pluggable, detachable and fixedly connected.

[0025] Specifically, a polygonal block 11 is fixedly fitted on the outside of the flathead screwdriver bit 1. The polygonal block 11 can have three or four sides. A limiting platform 23 is fixedly fitted inside the positioning sleeve 2. A polygonal hole 231 that matches the polygonal block 11 is opened through the platform of the limiting platform 23. When the polygonal block 11 is triangular, the polygonal hole 231 is also triangular. The polygonal hole 231 and the polygonal block 11 are the same size. The polygonal block 11 can slide in the polygonal hole 231. A countersunk hole 24 that connects to the polygonal hole 231 is opened on the outer peripheral wall of the positioning sleeve 2. A locking screw 8 is screwed into the countersunk hole 24. The countersunk hole 24 can hide the locking screw 8. Specifically, the locking screw 8 is screwed into the small hole in the countersunk hole 24. When the locking screw 8 is tightened, one end of it will press against the outer wall of the polygonal block 11, thereby locking the positioning sleeve 2 and the flathead screwdriver bit 1. When the flathead screwdriver bit 1 rotates, it can drive the positioning sleeve 2 to rotate.

[0026] In this technical solution, at least three arc-shaped baffles 3 are arranged around the outer periphery of the positioning sleeve 2. In this embodiment, there are three arc-shaped baffles 3. The arc-shaped baffles 3 and the outer wall of the positioning sleeve 2 are rotatably connected, and their rotation axes are perpendicular to and do not intersect with the axis of the positioning sleeve 2. Preferably, the arc-shaped baffles 3 are S-shaped and their plane coincides with the axis of the positioning sleeve 2. The lower part of the arc-shaped baffles 3 is bent towards the axis of the positioning sleeve 2. A slip ring 4 is fitted on the outside of the positioning sleeve 2 above the arc-shaped baffles 3. The slip ring 4 and the positioning sleeve 2 slide together vertically. Specifically, the inner diameter of the slip ring 4 is the same as the outer diameter of the positioning sleeve 2. The top of the arc-shaped baffles 3 is hinged to the outer periphery of the slip ring 4 through a connecting rod 5. When the slip ring 4 moves downward, the bottom end of the arc-shaped baffles 3 moves towards the axis of the positioning sleeve 2. Conversely, the bottom end of the arc-shaped baffles 3 moves away from the axis of the positioning sleeve 2. Thus, the diameter of the circle where the bottom ends of the three arc-shaped baffles 3 are located is adjustable, which facilitates the limiting of screw heads with different outer diameters.

[0027] Specifically, a U-shaped seat 21 is welded to the outer peripheral wall of the positioning sleeve 2, and a positioning shaft 31 is fixedly connected to the surface of the arc-shaped baffle 3 near the top. The positioning shaft 31 is located inside the U-shaped seat 21 and coaxial connecting shafts 311 are welded to both ends of it. The U-shaped seat 21 is provided with a positioning hole 211 that transitions with the connecting shaft 311. This arrangement can improve the rotation accuracy of the arc-shaped baffle 3 and prevent rotational wobbling.

[0028] In this embodiment, a drive sleeve 6 is sleeved on the outside of the positioning sleeve 2, located above the slip ring 4. The drive sleeve 6 and the positioning sleeve 2 are screwed together. Specifically, the drive sleeve 6 has an internal thread, and the positioning sleeve 2 has an external thread. When the drive sleeve 6 rotates relative to the positioning sleeve 2, it will move axially, thereby limiting the upward movement of the slip ring 4. The outer peripheral wall of the drive sleeve 6 is fixedly connected with circumferentially evenly distributed resistance bars 62. The resistance bars 62 are designed to facilitate manual hand-twisting.

[0029] Furthermore, the positioning sleeve 2 is externally fixedly fitted with a retaining ring 22 located below the slip ring 4, and the positioning sleeve 2 is externally fitted with a support spring 7 located between the retaining ring 22 and the slip ring 4. The support spring 7 continuously applies an upward elastic thrust to the slip ring 4. This elastic thrust causes the bottom ends of the three arc-shaped baffles 3 to move synchronously when the drive sleeve 6 rotates in both directions.

[0030] In this embodiment, the bottom wall of the drive sleeve 6 is fixedly connected to at least one support rod 61. The number of support rods 61 is two and they are symmetrically distributed relative to the drive sleeve 6. The upper end face of the slip ring 4 is provided with circumferentially evenly distributed spherical grooves 41. The number of spherical grooves 41 is even. The diameter of the spherical grooves 41 is larger than the outer diameter of the support rods 61. When the support rods 61 are inserted into the spherical grooves 41, the drive sleeve 6 cannot rotate on its own, which has the effect of preventing loosening. The spherical grooves 41 are shallow groove structures. When the drive sleeve 6 is rotated by force, the support rods 61 will move out of the grooves. The bottom of the support rods 61 can be processed into a spherical structure.

[0031] Working principle: When it is necessary to tighten a large number of flathead screws with small differences in the outer diameter of the screw head, first use a screwdriver to loosen the locking screw 8, then put the flathead bit 1 into the positioning sleeve 2 so that the polygonal block 11 is inserted into the polygonal hole 231. Then, align the flathead bit 1 with the slot of one of the flathead screws. At this time, manually rotate the drive sleeve 6. Under the push of the support spring 7, the sliding ring 4 will move. Under the transmission of the connecting rod 5, the bottom end of the arc-shaped baffle 3 will move radially relative to the positioning sleeve 2. When the bottom end of the arc-shaped baffle 3 is approximately in contact with the outer peripheral wall of the screw head, slightly rotate the drive sleeve 6 so that the support rod 61 enters the nearest spherical groove 41. Then use a screwdriver to tighten the locking screw 8, and the positioning sleeve 2 and the flathead bit 1 are locked. At this time, connect the flathead bit 1 to the electric screwdriver, and then perform the tightening operation on this type of flathead screw. Under the limitation of the arc-shaped baffle 3, the flathead bit 1 will not slip out of the slot. When it is necessary to tighten slotted screws of other outer diameters (screw heads), simply manually tighten the drive sleeve 6, and then adjust the position of the bottom end of the arc baffle 3 by comparing it with the screw head. This has the advantage of making it more convenient to switch between tightening and loosening slotted screws with small differences in outer diameter.

[0032] 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 screwdriver bit anti-loosening device, comprising a flathead screwdriver bit (1) and a positioning sleeve (2) sleeved on the outside of the flathead screwdriver bit (1), wherein the flathead screwdriver bit (1) is located in the middle of the positioning sleeve (2), characterized in that, The outer periphery of the positioning sleeve (2) is provided with at least three arc-shaped baffles (3) arranged around it. The arc-shaped baffles (3) and the outer wall of the positioning sleeve (2) are rotatably connected, and their rotation axes are perpendicular to and do not intersect with the axis of the positioning sleeve (2). The outer side of the positioning sleeve (2) is fitted with a slip ring (4) located above the arc-shaped baffles (3). The top end of the arc-shaped baffles (3) is hinged to the outer periphery of the slip ring (4) through a connecting rod (5). When the slip ring (4) moves downward, the bottom end of the arc-shaped baffles (3) moves in the direction of the axis of the positioning sleeve (2). The outer side of the positioning sleeve (2) is fitted with a drive sleeve (6) located above the slip ring (4). The drive sleeve (6) and the positioning sleeve (2) are screwed together.

2. The electric screwdriver bit anti-loosening device according to claim 1, characterized in that: The arc-shaped baffle (3) is S-shaped and its plane coincides with the axis of the positioning sleeve (2). The lower part of the arc-shaped baffle (3) is bent in the direction of the axis of the positioning sleeve (2).

3. The electric screwdriver bit anti-loosening device according to claim 2, characterized in that: The outer peripheral wall of the positioning sleeve (2) is welded with a U-shaped seat (21), and a positioning shaft (31) near the top is fixedly connected through the surface of the arc-shaped baffle (3). The positioning shaft (31) is located inside the U-shaped seat (21) and coaxial connecting shafts (311) are welded to both ends of it. The U-shaped seat (21) is provided with a positioning hole (211) that transitions with the connecting shaft (311).

4. The electric screwdriver bit anti-loosening device according to claim 1, characterized in that: The positioning sleeve (2) is fixedly fitted with a retaining ring (22) located below the slip ring (4), and the positioning sleeve (2) is fitted with a support spring (7) located between the retaining ring (22) and the slip ring (4).

5. The electric screwdriver bit anti-loosening device according to claim 4, characterized in that: At least one support rod (61) is fixedly connected to the bottom wall of the drive sleeve (6), and the upper end face of the slip ring (4) is provided with circumferentially evenly distributed spherical grooves (41), the diameter of the spherical grooves (41) being larger than the outer diameter of the support rod (61).

6. The electric screwdriver bit anti-loosening device according to claim 1, characterized in that: The outer peripheral wall of the drive sleeve (6) is fixedly connected with circumferentially evenly distributed resistance-increasing strips (62).

7. The electric screwdriver bit anti-loosening device according to claim 1, characterized in that: The inner diameter of the slip ring (4) is the same as the outer diameter of the positioning sleeve (2).

8. The electric screwdriver bit anti-loosening device according to claim 1, characterized in that: The flathead screwdriver bit (1) is fixedly fitted with a polygonal block (11) on its outside. The positioning sleeve (2) is fixedly fitted with a limiting platform (23). A polygonal hole (231) adapted to the polygonal block (11) is opened through the platform of the limiting platform (23). A countersunk hole (24) communicating with the polygonal hole (231) is opened on the outer peripheral wall of the positioning sleeve (2). A locking screw (8) is screwed into the countersunk hole (24).

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