Cross countersunk head self-locking bolt
By embedding locking washers and limit clips in the countersunk head bolts, the problems of bolt loosening and missing parts are solved, achieving efficient anti-loosening and simplified production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- YANGZHOU XINLENG MASCH MFG CO LTD
- Filing Date
- 2025-06-18
- Publication Date
- 2026-04-28
AI Technical Summary
Traditional Phillips head countersunk bolts are prone to loosening due to vibration or external force, which reduces the reliability of the connection. Furthermore, anti-loosening accessories are easily lost, increasing production costs or resulting in poor anti-loosening effect.
A cross-head countersunk self-locking bolt was designed. By embedding a locking washer on the nut, the elastic force of the rubber washer is used to maintain a tight connection, and a limiting clip is used to prevent the washer ring from falling off, simplifying the structure and avoiding loss.
It effectively prevents bolts from loosening due to vibration or external force, improves connection reliability, reduces production costs, ensures the complete realization of the anti-loosening function, and is easy to mass-produce and apply.
Smart Images
Figure CN224174404U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of bolt technology, specifically to a cross-head countersunk self-locking bolt. Background Technology
[0002] In the field of mechanical connections, the combination of bolts and nuts is a common fastening method. Traditional countersunk head bolts and nuts are prone to loosening after installation due to vibration, external forces, or prolonged use, leading to reduced connection reliability and affecting the normal operation and safety of equipment.
[0003] To address the problem of loose bolts, some bolt structures with anti-loosening functions have emerged on the market. However, most existing anti-loosening bolt structures are quite complex, increasing production costs and installation difficulty; or their anti-loosening effect is not ideal, failing to effectively prevent bolt loosening under various working conditions. Furthermore, some accessories such as anti-loosening washers are easily lost, and if not properly stored during installation, they can prevent the anti-loosening function from functioning correctly, causing inconvenience to users.
[0004] Therefore, there is a need for a simple structure, good anti-loosening effect, and the ability to prevent the loss of accessories, in order to meet the needs of actual production and use. Utility Model Content
[0005] The purpose of this invention is to provide a cross-head countersunk self-locking bolt to solve the problems mentioned in the background art.
[0006] To achieve the above objectives, this utility model provides the following technical solution: a cross-head countersunk self-locking bolt, comprising a screw rod, a nut screwed onto the shank of the screw rod, a locking washer embedded on one side of the nut, the locking washer being removed from the nut and then fitted onto the shank of the screw rod, and the nut being inverted and screwed onto the shank of the screw rod, after the nut is locked onto the shank of the screw rod, the locking washer is tightly clamped between the end plate of the screw rod and the workpiece, thereby achieving a tight and reinforced screw connection between the screw rod and the nut.
[0007] Preferably, the top surface of the nut has an insert groove for holding a locking washer.
[0008] Preferably, notches are provided on both sides of the insert groove, and the notches are used to push the locking pad out of the insert groove after the fingernail is inserted.
[0009] Preferably, the locking pad includes a washer ring and a rubber pad, both of which are circular ring plates, and the fitting groove is a circular groove. The sum of the thicknesses of the washer ring and the rubber pad is equal to the depth of the fitting groove.
[0010] Preferably, a limiting clip is provided between the insert groove and the rubber pad to limit the pad ring in the insert groove.
[0011] Preferably, the limiting device includes a slot and a limiting ring. The slot is an annular groove with a circular opening, and the limiting ring is a circular ring with a circular cross-section. After the pad ring is inserted into the mounting groove, the limiting ring is inserted into the slot. The cross-sectional diameter of the limiting ring is larger than the bottom opening width of the slot.
[0012] Compared with the prior art, the beneficial effects of this utility model are:
[0013] This utility model proposes a countersunk head self-locking bolt. After the nut is locked into the bolt body, the locking washer is tightly clamped between the end plate of the bolt and the workpiece. Its rebound force can continuously apply pressure, keeping the bolt and nut in a tight screwed connection at all times. This effectively prevents the bolt from loosening due to vibration, external forces, etc., and greatly improves the reliability of the connection. This countersunk head self-locking bolt is only an improvement on the traditional bolt structure, adding simple structures such as an insert groove, notch, and locking washer. It does not involve a major complex design of the main structure of the bolt and nut, so the production process is relatively simple, the cost increase is limited, and it is easy to mass-produce and promote its application. When the bolt is not installed, the washer ring can be stored in the insert groove inside the nut and locked together by a limiting clip to prevent the washer ring from falling out of the insert groove. This design effectively solves the problem of easy loss of traditional anti-loosening accessories, ensuring that the locking washer can be used intact when installing the bolt, ensuring the realization of the anti-loosening function. Attached Figure Description
[0014] Figure 1 This is a schematic diagram of the structure of this utility model;
[0015] Figure 2 This is a front view of the structure of this utility model;
[0016] Figure 3 for Figure 2 Sectional view of the structure at point AA;
[0017] Figure 4 for Figure 3 Enlarged schematic diagram of the structure at point A in the middle;
[0018] Figure 5 This is a schematic diagram of the structure of the gasket ring after it has been removed and used.
[0019] In the diagram: 1. Screw; 2. Nut; 3. Insert groove; 4. Washer ring; 5. Rubber pad; 6. Slot; 7. Limiting ring; 8. Notch. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0021] Please see Figures 1 to 5 This utility model provides a technical solution: a cross-head countersunk self-locking bolt, including a screw rod 1, a nut 2 screwed onto the body of the screw rod 1, a locking washer embedded on one side of the nut 2, and an insertion groove 3 on the top surface of the nut 2 for holding the locking washer. Both sides of the insertion groove 3 have notches 8 for pushing the locking washer out of the insertion groove 3 when a fingernail is inserted. After the locking washer is removed from the nut 2, it is fitted onto the body of the screw rod 1. The nut 2 is then inverted and screwed onto the body of the screw rod 1. After the nut 2 is locked onto the body of the screw rod 1, the locking washer is tightly clamped between the end plate of the screw rod 1 and the workpiece, achieving a tight and reinforced screw connection between the screw rod 1 and the nut 2.
[0022] The locking pad includes a washer ring 4 and a rubber pad 5. Both the washer ring 4 and the rubber pad 5 are circular ring plates. The fitting groove 3 is a circular groove. The sum of the thicknesses of the washer ring 4 and the rubber pad 5 is equal to the depth of the fitting groove 3. A limiting device is provided between the fitting groove 3 and the rubber pad 5 to limit the washer ring 4 in the fitting groove 3. The limiting device includes a retaining groove 6 and a limiting ring 7. The retaining groove 6 is an annular groove with a circular opening. The limiting ring 7 is a circular ring with a circular cross-section. After the washer ring 4 is inserted into the fitting groove 3, the limiting ring 7 is inserted into the retaining groove 6. The cross-sectional diameter of the limiting ring 7 is larger than the width of the bottom opening of the retaining groove 6. When the bolt is not in use, push the washer 4 into the mounting groove 3. The limit ring 7 and the retaining groove 6 engage with each other to prevent the washer 4 from falling out of the mounting groove 3. When the bolt needs to be installed, unscrew the nut 2 from the rod of the screw 1, insert a fingernail into the notch 8 to push the washer 4 out of the mounting groove 3, and then put the washer 4 on the rod of the screw 1. After passing the rod of the screw 1 through the hole on the surface of the workpiece, screw the nut 2 onto the screw 1 and lock it. At this time, the rubber pad 5 and the washer 4 are tightly clamped between the end plate of the screw 1 and the workpiece. The rubber pad 5 undergoes elastic deformation, and the rebound force of the rubber pad 5 makes the screw 1 and the nut 2 tightly screwed together. Furthermore, when the washer 4 is stored inside the nut 2, it prevents the washer 4 from being lost.
[0023] Detailed instructions for using Phillips head countersunk self-locking bolts:
[0024] Before bolt installation: When the bolt is not in use, the locking washer (including washer ring 4 and rubber washer 5) should be stored in nut 2. Push washer ring 4 into the recessed groove 3 on the top surface of nut 2. At this time, the retaining ring 7 is inserted into the retaining groove 6. Since the cross-sectional diameter of retaining ring 7 is larger than the bottom opening width of retaining groove 6, the two engage with each other, effectively preventing washer ring 4 from falling out of recessed groove 3, thus preventing the locking washer from being lost.
[0025] Bolt Installation and Use Stage: To install the bolt, first remove the nut 2 from the screw rod 1. Using a fingernail inserted into the notches 8 on both sides of the mounting groove 3, push the washer 4 out of the mounting groove 3 using the space provided by the notches 8, separating the locking washer from the nut 2. Place the locking washer (waist ring 4 and rubber washer 5) removed from the mounting groove 3 onto the screw rod 1. Pass the screw rod 1 through the pre-drilled hole on the workpiece surface. Invert the nut 2 and screw it onto the screw rod 1, then tighten it to lock the nut 2 onto the screw rod 1. At this point, the rubber washer 5 and washer 4 are tightly clamped between the end plate of the screw rod 1 and the workpiece. The rubber washer 5 undergoes elastic deformation due to compression, and its rebound force makes the screw rod 1 and nut 2 more tightly connected, achieving a tight and reinforced connection.
[0026] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A cross-head countersunk self-locking bolt, comprising a screw rod (1), wherein a nut (2) is screwed onto the shank of the screw rod (1), characterized in that: A locking washer is embedded on one side of the nut (2). After the locking washer is removed from the nut (2), it is sleeved on the rod of the screw (1). The nut (2) is then inverted and screwed onto the rod of the screw (1). After the nut (2) is locked onto the rod of the screw (1), the locking washer is tightly clamped between the end plate of the screw (1) and the workpiece, so as to achieve a tight and reinforced screw connection between the screw (1) and the nut (2).
2. The cross-head countersunk self-locking bolt according to claim 1, characterized in that: The nut (2) has an insert groove (3) on its top surface, which is used to hold a locking pad.
3. A cross-head countersunk self-locking bolt according to claim 2, characterized in that: Both sides of the mounting groove (3) are provided with notches (8), which are used to push the locking pad out of the mounting groove (3) after the fingernail is inserted.
4. A cross-head countersunk self-locking bolt according to claim 2, characterized in that: The locking pad includes a washer ring (4) and a rubber pad (5). Both the washer ring (4) and the rubber pad (5) are circular ring plates. The fitting groove (3) is a circular groove. The sum of the thicknesses of the washer ring (4) and the rubber pad (5) is equal to the depth of the fitting groove (3).
5. A cross-head countersunk self-locking bolt according to claim 2, characterized in that: A limiting clip is provided between the mounting groove (3) and the rubber pad (5) to limit the pad ring (4) in the mounting groove (3).
6. A cross-head countersunk self-locking bolt according to claim 5, characterized in that: The limiting device includes a slot (6) and a limiting ring (7). The slot (6) is an annular groove with a round opening at the cross-section, and the limiting ring (7) is a circular ring with a round cross-section. After the pad ring (4) is inserted into the mounting groove (3), the limiting ring (7) is inserted into the slot (6). The cross-sectional diameter of the limiting ring (7) is greater than the width of the bottom opening of the slot (6).