Self-locking bolt for blind hole
By designing self-locking bolts for blind holes, using the mating connection between internal threads and thread bosses, and achieving rotating self-locking through the six-party wrench tool, the problem of easy loosening of existing threaded connections in non-stable environments is solved, and the simplicity of structure, convenient operation and significant improvement in tightening effect is achieved.
Patent Information
- Application Number
- CN202421299021.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-05-27
- Estimated Expiration
- 2034-06-07
AI Technical Summary
Existing threaded connections are prone to loosening in non-stable environments, resulting in fallout accidents. Commonly used anti-loosening measures are inconvenient to use, difficult to disassemble or have low locking reliability.
A self-locking bolt for blind holes is designed, which is connected through the internal thread in the bolt tail and the thread boss in the bolt head, and is inserted into the hexagonal hole structure through the hexagonal wrench tool, and the rotary wrench realizes the tightening process of the self-locking bolt.
The structure and convenient operation of the self-locking bolt are achieved, which significantly improves the effect of tightening and anti-loosening, and avoids loosening during bolt connection.
Smart Images
Figure CN222910496U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the field of fastener design, and particularly relates to a self-locking bolt for blind holes. Background Art
[0002] As a commonly used threaded fastener, the bolt is convenient to use and has a wide range of application scenarios. However, when using threaded connections, it is common that the threaded mating parts are prone to looseness during long-term use in an unstable environment, and finally fall off, resulting in various accidents.
[0003] Currently, the commonly used anti-loosening measures mainly include methods such as tying a fuse, applying glue, and adding anti-loosening washers. The problems are inconvenient use, difficult disassembly, or low locking reliability. Summary of the Utility Model
[0004] The utility model provides a self-locking bolt for blind holes. The inner thread in the bolt tail and the threaded boss in the bolt head are used for mating connection. Then, by inserting an internal hexagon wrench tool into the hexagon hole structure that penetrates the bolt head and the bolt tail, rotating the wrench can realize the tightening and loosening process of the whole self-locking bolt.
[0005] For the self-locking bolt for blind holes of the utility model, the blind hole has threads. The self-locking bolt includes a bolt head and a bolt tail. The bolt head includes a large-diameter boss, a medium-diameter screw rod, and a small-diameter threaded boss from top to bottom. And the bolt head has a through first internal hexagon. The threads of the screw rod and the threaded boss are in the opposite direction; the bolt tail is a ring structure, having an external thread, an internal thread, and a second internal hexagon at the bottom; after the bolt tail and the threaded boss are tightly connected by threads, the external thread of the screw rod and the external thread of the bolt tail are continuous without interruption, and the first internal hexagon and the second internal hexagon have the same angle.
[0006] Advantageously, the parameters of the external thread of the screw rod and the external thread of the bolt tail are the same and match the threads of the blind hole.
[0007] Advantageously, an internal hexagon wrench tool is used to insert into the first internal hexagon and the second internal hexagon to tighten or disassemble the self-locking bolt.
[0008] Advantageously, the large-diameter boss is stuck at the outer end of the blind hole.
[0009] Advantageously, the large-diameter boss is annular.
[0010] Advantageously, the outer diameter of the bolt tail is the same as the outer diameter of the screw rod.
[0011] Beneficial effects: When the self-locking bolt becomes loose, the screw rod in the bolt head rotates in the opposite direction relative to the threaded hole. Since the thread helix direction of the thread boss in the bolt head is opposite to that of the screw rod, the thread boss rotates in the tightening direction relative to the internal thread. Or when the bolt tail becomes loose relative to the threaded hole, the internal thread rotates in the tightening direction relative to the thread boss, thereby forming a self-locking process and avoiding the loosening phenomenon during the bolt connection process.
[0012] The structure is simple, the operation is convenient, and the fastening and anti-loosening effects are remarkable. Description of the drawings
[0013] Figure 1 Is an axonometric view of the self-locking bolt for blind holes;
[0014] Figure 2 Is a schematic structural view of the bolt head;
[0015] Figure 3 Is a schematic structural view of the bolt tail.
[0016] 1. Bolt head; 2. Bolt tail; 3. Screw rod; 4. Thread boss; 5. First internal hexagon; 6. Boss; 7. External thread, 8 - Second internal hexagon, 9 - Internal thread Detailed implementation manners
[0017] The present utility model provides a self-locking bolt for blind holes, which includes two parts: a bolt head 1 and a bolt tail 2. The bolt head 1 and the bolt tail 2 have a through hexagon hole structure for inserting an internal hexagon wrench tool to realize the overall installation and disassembly of the self-locking bolt.
[0018] The bolt head 1 includes a screw rod 3, a thread boss 4, a first internal hexagon 5 and a boss 6. The screw rod 3 is the main connection structure of the self-locking bolt and is used to cooperate with the internal thread of the blind hole to play a role in positioning and tightening. The thread boss 4 and the internal thread 9 in the bolt tail 2 should satisfy the corresponding positional relationship to ensure that after the bolt tail 2 is tightened onto the thread boss 4, the external thread of the screw rod 3 and the external thread 7 of the bolt tail 2 have continuous and uninterrupted helical lines, and there will be no jamming phenomenon during the tightening process of the self-locking bolt. At the same time, the angles of the first internal hexagon 5 of the bolt head 1 and the second internal hexagon 8 of the bolt tail 2 are kept consistent, which is convenient for using the internal hexagon wrench tool to insert and tighten the self-locking bolt. The external thread of the thread boss 4 is opposite to the external thread of the screw rod 3, and the external thread of the thread boss 4 is connected and matched with the internal thread 9 of the bolt tail 2, and the thread parameters are kept consistent.
[0019] During use, first, the bolt tail 2 and the bolt head 1 are connected by the cooperation of the internal thread 9 of the bolt tail 2 and the threaded boss 4. At this time, the first internal hexagon 5 in the bolt head 1 and the second internal hexagon 8 in the bolt tail 2 are in the same position. Then, an internal hexagon wrench tool is inserted into the hexagon hole structure that penetrates the bolt head 1 and the bolt tail 2, and rotating the wrench can realize the tightening and loosening process of the self-locking bolt as a whole.
[0020] When the self-locking bolt becomes loose, when the screw rod 3 rotates outward relative to the threaded hole and loosens, since the thread direction of the threaded boss 4 in the bolt head 1 is opposite to that of the screw rod 3, the threaded boss 4 rotates in the tightening direction relative to the internal thread 9. Or when the external thread 7 rotates inward relative to the threaded hole and loosens, the internal thread 9 rotates in the tightening direction relative to the threaded boss 4, thereby forming a self-locking process.
Claims
1. A self-locking bolt for a blind hole, the blind hole having a thread, characterized in that: The self-locking bolt comprises a bolt head (1) and a bolt tail (2), wherein the bolt head (1) comprises, from top to bottom, a large-diameter boss (6), a medium-diameter screw rod (3) and a small-diameter threaded boss (4), and the bolt head (1) has a first internal hexagon (5) penetrating therethrough, and the threads of the screw rod (3) and the threaded boss (4) are in opposite directions; the bolt tail (2) is an annular structure, and has an external thread (7), an internal thread (9) and a second internal hexagon (8) at the bottom; after the threads of the bolt tail (2) and the threaded boss (4) are tightly connected, the external thread of the screw rod (3) and the external thread (7) of the bolt tail (2) are continuous and uninterrupted, and the first internal hexagon (5) and the second internal hexagon (8) have the same angle.
2. The self-locking bolt for blind holes according to claim 1, characterized in that: The parameters of the external thread of the screw rod (3) and the external thread (7) of the bolt tail (2) are consistent, matching the blind hole thread.
3. The self-locking bolt for blind holes according to claim 1, characterized in that: Use the hexagon socket wrench tool to insert the first hexagon socket (5) and the second hexagon socket (8) to tighten or remove the self-locking bolt.
4. The self-locking bolt for blind holes according to claim 1, characterized in that: The large-diameter boss (6) is clamped at the outer end of the blind hole.
5. The self-locking bolt for blind holes according to claim 4, characterized in that: The large-diameter boss (6) is annular.
6. The self-locking bolt for blind holes according to claim 1, characterized in that: The outer diameter of the bolt tail (2) is the same as the outer diameter of the screw rod (3).