CN215805646U

CN215805646U - Nonstandard screw

Info

Publication number: CN215805646U
Application number: CN202122069441.5U
Authority: CN
Inventors: 陈隆
Original assignee: Chongqing Shengbang Standard Parts Manufacturing Co ltd
Current assignee: Chongqing Shengbang Standard Parts Manufacturing Co ltd
Priority date: 2021-08-30
Filing date: 2021-08-30
Publication date: 2022-02-11
Anticipated expiration: 2031-08-30

Abstract

The utility model relates to a non-standard screw, which comprises a screw cap and a screw rod, and is characterized in that: the screw is positioned below the nut, and the bolt comprises a first thread and a second thread; the first threads are positioned at the upper end of the screw rod and close to the nut, the first threads and the second threads are arranged at intervals, and third threads are arranged between adjacent threads at the position below the second threads; the height of the third thread ridge is lower than that of the second thread ridge; the second thread is provided with a notch; the notch extends in the length direction of the screw rod, and the depth from bottom to top is gradually reduced; the notches are at least one group; the lower end of the second thread is positioned below the screw and is provided with a tip; the utility model has ingenious improvement, the first thread, the second thread and the third thread are designed on the bolt, the combination of the third bolt and the second thread is designed at the lower end of the screw rod, which is beneficial to turning and meshing, and meanwhile, the notch structure is designed, so that the friction surface can be increased.

Description

Nonstandard screw

Technical Field

The utility model relates to the technical field of non-standard part processing, in particular to a non-standard screw.

Background

The existing screw usually comprises a nut and a screw rod, a thread is generally arranged below the screw rod, for example, a long rod screw, a gap exists between the thread and the nut, and no gap exists if the screw is a short rod screw.

SUMMERY OF THE UTILITY MODEL

In order to solve the above-mentioned problems of the prior art, the present invention provides a non-standard screw which can improve the above-mentioned disadvantages.

The utility model relates to a non-standard screw, which comprises a screw cap and a screw rod, wherein the screw rod is positioned below the screw cap, and the top end of the screw cap is provided with a cross groove or a straight groove; the bolt comprises a first thread and a second thread; the first thread is positioned at the upper end of the screw rod and close to the nut, and an inverted conical surface is arranged below the nut; the first threads and the second threads are arranged at intervals, and the distance between the first threads and the second threads accounts for one fourth to one fifth of the whole screw; a third thread is arranged between the adjacent threads at the position below the second thread; the height of the third thread ridge is lower than that of the second thread ridge; the second thread is provided with a notch; the notch extends in the length direction of the screw rod, and the depth from bottom to top is gradually reduced; the notches are at least one group; the lower end of the second thread is positioned below the screw and is provided with a tip; the tip has a plurality of chamfered surfaces that facilitate rotation of the aperture.

Further, the distance between adjacent teeth of the second threads is 6 mm.

Further, the distance between the adjacent teeth of the second thread and the third thread is 3 mm.

Furthermore, the number of turns of the first threads is 2-3.

Further, the first thread, the second thread or the third thread has an oblique angle of 10-12 degrees with the horizontal line.

Furthermore, the surfaces of the nut and the bolt are provided with a zinc-nickel alloy coating with the thickness of 8 mu m.

The utility model has ingenious improvement, the first thread, the second thread and the third thread are designed on the bolt, the combination of the third bolt and the second thread is designed at the lower end of the screw rod, which is beneficial to turning and meshing, meanwhile, the notch structure is designed, the friction surface can be increased, especially when the screw rod enters a wooden structure, the common situation is easy to extrude, the wooden texture can be clamped in the notch, and meanwhile, the position of the first thread close to the nut can be locked, and compared with the background technology, the utility model has great advantage improvement.

Drawings

Fig. 1 is a schematic view of a screw structure in the prior art.

FIG. 2 is a schematic view of the structure of the present invention.

The figure is as follows: 1 nut, 2 first threads, 3 straight grooves, 4 screws, 5 second threads, 6 notches, 7 tips and 8 third threads.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

As shown in figure 2, the utility model relates to a non-standard screw, which comprises a screw cap 1 and a screw rod 4, wherein the screw rod is made of chrome molybdenum alloy steel, the screw rod is positioned below the screw cap, and the top end of the screw cap is provided with a straight groove 3; the bolt comprises a first thread 2 and a second thread 5; the first thread is positioned at the upper end of the screw rod and close to the nut, and an inverted conical surface is arranged below the nut; the first threads and the second threads are arranged at intervals, and the distance between the first threads and the second threads accounts for one fourth to one fifth of the whole screw; a third thread 8 is arranged between the adjacent threads at the position below the second thread; the height of the third thread is lower than that of the second thread, so that the occlusal surface is increased, and the stability is improved; the second thread is provided with 6 notches; the notch extends in the length direction of the screw rod, and the depth from bottom to top is gradually reduced; the notches are at least one group; the lower end of the second thread is positioned below the screw and is provided with a tip 7; the tip has a plurality of chamfered surfaces that facilitate rotation of the aperture.

As a technical improvement, the distance between adjacent teeth of the second thread is 6 mm.

As a technical improvement, the distance between the adjacent teeth of the second thread and the third thread is 3 mm.

As a technical improvement, the number of turns of the first thread is 2-3.

As a technical improvement, the oblique angle between the first thread, the second thread or the third thread and the horizontal line is 10-12 degrees, the corrosion resistance is high, and the antirust capacity is improved.

As a technical improvement, the surfaces of the nut and the bolt are provided with a zinc-nickel alloy coating with the thickness of 8 mu m.

When using, because there is first screw thread on the screw thread, can increase stability, the not hard up possibility of prevention, simultaneously owing to design jaggedly, can increase with wooden material's contact surface, stability is stronger.

Claims

1. The utility model provides a nonstandard screw, includes nut and screw rod, its characterized in that: the screw is positioned below the screw cap, and a cross groove or a straight groove is formed in the top end of the screw cap; the screw rod comprises a first thread and a second thread; the first thread is positioned at the upper end of the screw rod and close to the nut, and an inverted conical surface is arranged below the nut; the first threads and the second threads are arranged at intervals, and the distance between the first threads and the second threads accounts for one fourth to one fifth of the whole screw; a third thread is arranged between the adjacent threads at the position below the second thread; the height of the third thread ridge is lower than that of the second thread ridge; the second thread is provided with a notch; the notch extends in the length direction of the screw rod, and the depth from bottom to top is gradually reduced; the notches are at least one group; the lower end of the second thread is positioned below the screw and is provided with a tip; the tip has a plurality of chamfered surfaces.

2. A non-standard screw according to claim 1, wherein: and the distance between adjacent teeth of the second thread is 6 mm.

3. A non-standard screw according to claim 2, wherein: and the distance between the adjacent teeth of the second thread and the third thread is 3 mm.

4. A non-standard screw according to claim 1, wherein: the number of turns of the first threads is 2-3 turns.

5. A non-standard screw according to claim 1, wherein: the first thread or the second thread or the third thread has an oblique angle of 10-12 degrees with the horizontal.

6. A non-standard screw according to claim 1, wherein: and the surfaces of the screw cap and the screw bolt are provided with zinc-nickel alloy coating layers, and the thickness of the zinc-nickel alloy coating layers is 8 mu m.