fastener

Abstract

This utility model relates to fasteners, characterized in that they include: a screw rod comprising a single-threaded section and a double-threaded section, wherein the single-threaded section is provided with a first thread; the double-threaded section is provided with both a first thread and a second thread, the pitch of the first thread being greater than the pitch of the second thread; a main nut, which is threadedly engaged with the first threaded section; and a secondary nut, which is threadedly engaged with the second threaded section. The secondary nut is located outside the main nut, so when subjected to vibration, the main nut axially compresses the secondary nut, increasing the friction between the secondary nut and the main screw rod, preventing the secondary nut from rotating. When the secondary nut cannot rotate, it axially hinders the movement of the main nut, thus preventing the main nut from falling off or loosening.

Description

Technical Field

[0001] This utility model relates to fasteners. Background Technology

[0002] Fasteners consisting of a screw and a nut have a wide range of applications. The threaded connection between the nut and the screw facilitates assembly and disassembly, but this also causes some inconveniences. For example, in applications subject to prolonged vibration, the connection between the nut and the screw can easily loosen, potentially leading to connection failure. Therefore, providing a fastener that ensures a secure and stable connection is one of the main challenges facing this field. Utility Model Content

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fastener that can ensure a secure and stable connection.

[0004] To achieve the above objectives, this utility model employs the following technical solution:

[0005] Fastener, characterized in that it comprises:

[0006] The screw includes a single thread section and a double thread section. The single thread section is provided with a first thread. The double thread section is provided with both a first thread and a second thread. The pitch of the first thread is greater than the pitch of the second thread.

[0007] The main nut is threadedly engaged with the first threaded section;

[0008] A secondary nut, which is threadedly engaged with the second threaded section.

[0009] According to one embodiment of the present invention, a nut is provided on the screw, the nut is located at one end of the screw, and the single thread segment is disposed between the nut and the double thread segment.

[0010] According to one embodiment of the present invention, the double-threaded section extends from the other end of the screw to a point not exceeding two-thirds of the screw length.

[0011] According to one embodiment of the present invention, the pitch of the first thread is 0.12mm-160mm, and / or the pitch of the second thread is 0.1mm-140mm.

[0012] According to one embodiment of the present invention, the pitch of the first thread is more than 20% larger than the pitch of the second thread.

[0013] According to one embodiment of the present invention, the secondary nut is located outside the main nut.

[0014] According to one embodiment of this utility model, the pitch of the first thread and the pitch of the second thread are respectively selected from the following values: 0.12mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm The pitch of the second thread is selected from the following values: 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40mm, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 105mm, 120mm, 140mm, 160mm; 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm , 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40m, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 105mm, 120mm, 140mm.

[0015] The outer side mentioned in this utility model refers to the direction in which the auxiliary nut is located for disassembly of the main nut, that is, the direction that prevents the main nut from being disassembled.

[0016] In this invention, the fastener has a first thread pitch greater than the second thread pitch. Therefore, the main nut can pass through the section where both the first and second threads are present and engage with the portion of the thread where only the first thread is present. The second nut engages with the second thread only on the section where both the first and second threads are present. The auxiliary nut is located outside the main nut. Therefore, when subjected to vibration, the main nut axially presses against the auxiliary nut, increasing the friction between the auxiliary nut and the auxiliary screw, preventing the auxiliary nut from rotating. When the auxiliary nut cannot rotate, it axially hinders the movement of the main nut, thus preventing the main nut from falling off or loosening. In this invention, because the main nut axially presses against the auxiliary nut, increasing the friction between the auxiliary nut and the auxiliary screw, although there is circumferential friction when the main nut and auxiliary nut are in contact, this circumferential friction is insufficient to rotate the auxiliary nut. Attached Figure Description

[0017] Figure 1 The diagram shown is a schematic diagram of the screw structure in Embodiment 1 of this utility model.

[0018] Figure 2 for Figure 1 Enlarged diagram of part A in the image. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings:

[0020] Example 1

[0021] like Figure 1 and Figure 2 As shown, the fastener 100 includes a screw 110, a main nut, and a secondary nut (not shown in the figure). A nut 111 is provided at one end of the screw 110. The screw includes a single-threaded section 112 and a double-threaded section 113. The single-threaded section 112 has a first thread 114; the double-threaded section 113 has both a first thread 114 and a second thread 115, where the pitch of the first thread 114 is greater than the pitch of the second thread 115. The single-threaded section 112 is located between the nut 111 and the double-threaded section 113. The length of the double-threaded section 113 can be determined according to actual needs. For example, in one embodiment, the double-threaded section 113 extends from the other end of the screw 110 to a point not exceeding two-thirds of the length of the screw 110. The pitch of the first thread is 0.12mm-160mm, and / or the pitch of the second thread is 0.1mm-140mm. The pitch of the first thread is more than 20% larger than the pitch of the second thread.

[0022] The main nut engages with the first thread; the secondary nut engages with the second thread. The secondary nut is located outside the main nut. In this invention, "outside" refers to the secondary nut being located in the disassembly direction of the main nut, i.e., in the direction that prevents the main nut from being disassembled.

[0023] According to one embodiment of this utility model, the pitch of the first thread and the pitch of the second thread are respectively selected from the following values: 0.12mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm The pitch of the second thread is selected from the following values: 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40mm, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 105mm, 120mm, 140mm, 160mm; 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm , 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40m, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 105mm, 120mm, 140mm.

[0024] The embodiments described in this utility model are for illustrative purposes only and do not constitute a limitation on the scope of the claims. Other substantially equivalent substitutions that can be conceived by those skilled in the art are all within the protection scope of this utility model.

Claims

1. A fastener, characterized by include: A screw, the screw including a single thread section and a double thread section, the single thread section being provided with a first thread; the double thread section being provided with both a first thread and a second thread, the pitch of the first thread being greater than the pitch of the second thread; The main nut is threadedly engaged with the first threaded section; A secondary nut, which is threadedly engaged with the second threaded section.

2. The fastener of claim 1, wherein, A nut is provided on the screw, the nut is located at one end of the screw, and the single thread section is disposed between the nut and the double thread section.

3. The fastener of claim 1, wherein, The double-threaded section extends from the other end of the screw to a point not exceeding two-thirds of the screw length.

4. The fastener of claim 1, wherein, The pitch of the first thread is 0.12mm-160mm, and / or the pitch of the second thread is 0.1mm-140mm.

5. The fastener of claim 1, wherein, The pitch of the first thread is more than 20% larger than the pitch of the second thread.

6. The fastener of claim 1, wherein, The secondary nut is located outside the main nut.

7. The fastener of claim 1, wherein The pitch of the first thread and the pitch of the second thread are respectively selected from the following values: 0.12mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.25mm, 1.5mm, 1.75mm, 2mm, 2.25mm, 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm The pitch of the second thread is selected from the following values: 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40mm, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 105mm, 120mm, 140mm, 160mm; 2.5mm, 2.75mm, 3mm, 3.25mm, 3.5mm, 3.75mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm, 6.5mm , 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 28mm, 32mm, 36mm, 40m, 45mm, 50mm, 60mm, 70mm, 80mm, 90mm, 105mm, 120mm, 140mm.

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