Self-extrusion sleeve nut

Abstract

The utility model relates to a self-extrusion sleeve nut which comprises a sleeve nut body, the sleeve nut body is provided with a screw part and a cylindrical part, the inner side and the outer side of the screw part are provided with an internal thread and an external thread respectively, the cylindrical part is provided with a tightening groove used for being externally connected with a bit, the tightening groove is communicated with the internal thread, and the inner contour of the cross section of the screw part is circular. The outer contour of the screw part is an arc triangle coaxially distributed with the cylindrical part, and the internal thread and the external thread are respectively arranged on the inner contour and the outer contour of the screw part; the utility model mainly aims to reduce the contact area between an external thread and a workpiece in the installation process due to the fact that the outer contour of the screw part is in the shape of the arc triangle, and has the characteristics of high installation speed and good heat dissipation effect.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of fastener, especially relates to a self-extruding sleeve nut. BACKGROUND

[0002] The screw rod part of the conventional sleeve nut includes two threads inside and outside, wherein the outer thread is a self-tapping thread, and the inner thread is a common metric thread, which mainly functions to quickly tap the thread on the workpiece through the self-tapping thread, form the thread, lock on the workpiece, and then connect other screws through the inner thread, thereby playing the role of conversion and fixation. SUMMARY

[0003] In order to overcome the deficiencies of the background art, the utility model adopts the technical scheme of a self-extruding sleeve nut, which comprises a sleeve nut, the sleeve nut is provided with a screw rod part and a cylindrical part, the screw rod part is respectively provided with an inner thread and an outer thread on the inner side and the outer side, the cylindrical part is provided with a tightening groove for connecting a head, and the tightening groove is in communication with the inner thread, the inner contour of the cross section of the screw rod part is circular, the outer contour thereof is an arc triangle coaxially distributed with the cylindrical part, and the inner thread and the outer thread are respectively arranged on the inner contour and the outer contour of the screw rod part.

[0004] According to the above technical scheme, the inner thread of the utility model is a common metric thread, and the outer thread is a self-tapping thread, in the process of installation, the screw rod part is placed into the bottom hole of the workpiece, the head is clamped in the tightening groove, the head is rotated to drive the sleeve nut to rotate into the workpiece, the self-tapping thread taps the thread of the bottom hole at the same time, until the cylindrical part abuts against the surface of the workpiece, thereby completing the fixation of the sleeve nut, other screws are connected through the inner thread, and the application range is wide; the outer contour of the screw rod part is an arc triangle, which can reduce the contact area between the outer thread and the workpiece in the process of installation, has the characteristics of fast installation speed and good heat dissipation effect; in the process of producing the sleeve nut, the outer contour of the screw rod part is an arc triangle, which can play the role of positioning in the processes of tapping and marking, so that the appearance of each sleeve nut is rotated identically, and the market competitiveness of the product is improved.

[0005] The utility model is further provided with three groups of circumferentially distributed arc surfaces a and arc surfaces b connected between the adjacent arc surfaces a, the arc surfaces b are formed into a virtual cylinder with the axis of the inner thread as the center, and there is a gap between the arc surfaces a and the virtual cylinder.

[0006] Using the above technical solution, the bottom hole of the workpiece can be regarded as a virtual cylinder. When the sleeve nut is installed on the workpiece, the heat generated during tapping can be discharged through the gap, avoiding the high temperature generated during the rapid installation of the sleeve nut from affecting the installation strength between the sleeve nut and the workpiece.

[0007] The present invention is further configured such that the inner contour of the tightening groove is provided with protrusions distributed in a circular pattern, the inner side of the protrusion is provided with an arc surface c, the top of the protrusion is provided with a chamfered surface, and the arc surface c is coaxially distributed with the cylindrical part.

[0008] Furthermore, the diameter of the arc surface c is larger than the root circle diameter of the internal thread.

[0009] Using the above technical solution, the chamfered surface guides the screwdriver to align with the tightening groove. After the sleeve nut is fixed, other screws can pass through the arc surface c-thread and connect to the internal thread, avoiding interference between the protrusion and other screws.

[0010] The present invention is further configured such that the inner contour of the tightening groove is the same when rotated 120°.

[0011] By adopting the above technical solution, during the production process of sleeve nuts, when they pass through the guide rail, one of the arc surfaces b is always facing the direction of movement of the sleeve nut. This ensures that the tapping position, performance marking position, and logo marking position of each sleeve nut are the same after machining, rotating by 120°, so that the appearance of the sleeve nuts is consistent.

[0012] The present invention is further configured such that the arc surface b is provided with a chip removal groove, and the cylindrical part located on the outside of the screw part is provided with a receiving groove.

[0013] By adopting the above technical solution, during the installation of the sleeve nut, the waste generated by tapping the workpiece and the material at the bottom of the hole can be quickly discharged through the chip removal groove, and the discharged material enters the receiving groove, avoiding the material from getting stuck between the cylindrical part and the outer surface of the workpiece, thus improving the locking effect of the sleeve nut.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. Because the outer contour of the screw part is an arc triangle, the contact area between the external thread and the workpiece can be reduced during installation, which has the characteristics of fast installation speed and good heat dissipation effect;

[0016] 2. During the production of sleeve nuts, the outer contour of the threaded part of the sleeve nut is an arc triangle, which can play a positioning role during tapping, marking and other processes. With the help of a fixture with an arc triangle groove, the appearance of each sleeve nut is made to be the same, which improves the market competitiveness of the product.

[0017] The embodiments of this utility model will be further described below with reference to the accompanying drawings. Attached Figure Description

[0018] Figure 1 This is a perspective view of the first embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the first embodiment of the present invention;

[0020] Figure 3 For the present utility model Figure 2 A sectional view of the view along direction A;

[0021] Figure 4 For the present utility model Figure 1 A magnified view of a section at point B in the middle;

[0022] Figure 5 This is a top view of the present invention;

[0023] Figure 6 This is a cross-sectional view of the second embodiment of the present invention;

[0024] Wherein: 1 - sleeve nut, 2 - screw part, 3 - cylindrical part, 4 - internal thread, 5 - external thread.

[0025] 6 - Tightening groove, 7 - Arc surface a, 8 - Arc surface b, 9 - Virtual cylinder, 10 - Gap, 11 - Protrusion, 12 - Arc surface c, 13 - Chamfered surface, 14 - Chip removal groove, 15 - Receiving groove; Detailed Implementation

[0026] like Figures 1-5 As shown, this embodiment provides a first embodiment of the self-extruding sleeve nut of the present invention, including a sleeve nut 1. The sleeve nut 1 has a screw portion 2 and a cylindrical portion 3. The inner and outer sides of the screw portion 2 are respectively provided with internal threads 4 and external threads 5. The cylindrical portion 3 is provided with a tightening groove 6 for attaching a screwdriver bit, and the tightening groove 6 is connected to the internal thread 4. The inner contour of the cross-section of the screw portion 2 is circular, and its outer contour is an arc triangle distributed coaxially with the cylindrical portion 3. The internal thread 4 and the external thread 5 are respectively provided on the inner contour and outer contour of the screw portion 2. The outer contour of the screw portion 2 is provided with three... The assembly consists of circumferentially distributed arc surfaces a7 and arc surfaces b8 connected between adjacent arc surfaces a7. Arc surfaces b8 rotate around the axis of the internal thread 4 to form a virtual cylinder 9. There is a gap 10 between arc surfaces a7 and the virtual cylinder 9. The inner contour of the tightening groove 6 is provided with circumferentially distributed protrusions 11. The inner side of the protrusions 11 is provided with an arc surface c12. The top of the protrusions 11 is provided with a chamfered surface 13. The arc surface c12 is coaxially distributed with the cylindrical part 3. The diameter D of the arc surface c12 is larger than the root circle diameter d of the internal thread 4. The inner contour of the tightening groove 6 rotates by 120°.

[0027] Combination Figure 6 As shown, this utility model provides a second embodiment of a self-extruding sleeve nut, including a sleeve nut 1. The sleeve nut 1 has a screw portion 2 and a cylindrical portion 3. The inner and outer sides of the screw portion 2 are respectively provided with internal threads 4 and external threads 5. The cylindrical portion 3 is provided with a tightening groove 6 for attaching a screwdriver bit, and the tightening groove 6 is connected to the internal thread 4. The inner contour of the cross-section of the screw portion 2 is circular, and its outer contour is an arc triangle distributed coaxially with the cylindrical portion 3. The internal thread 4 and the external thread 5 are respectively provided on the inner contour and outer contour of the screw portion 2. The outer contour of the screw portion 2 is provided with three sets of circumferentially distributed arc surfaces a7, and arc surfaces b8 connecting adjacent arc surfaces a7. The arc surface b8 rotates around the axis of the internal thread 4 to form a virtual cylinder 9. There is a gap 10 between the arc surface a7 and the virtual cylinder 9. The arc surface b8 is provided with a chip removal groove 14, which is a trapezoidal groove, so that the screw part 2 has three trapezoidal grooves distributed in a circle. The cylindrical part 3 is provided with a receiving groove 15 on the outside of the screw part 2. The inner contour of the tightening groove 6 is provided with a protrusion 11 distributed in a circle. The inner side of the protrusion 11 is provided with an arc surface c12. The top of the protrusion 11 is provided with a chamfered surface 13. The arc surface c12 is coaxially distributed with the cylindrical part 3. The diameter D of the arc surface c12 is larger than the root circle diameter d of the internal thread 4. The inner contour of the tightening groove 6 rotates by 120°.

[0028] The working principle of this utility model is as follows: the internal thread 4 of the sleeve nut 1 is a common metric thread, and the external thread 5 is a self-tapping thread. During the installation process, the screw part 2 is placed into the bottom hole of the workpiece, and the screw is engaged with the tightening groove 6 by the screwdriver bit. The screwdriver bit is rotated to drive the sleeve nut 1 to rotate into the workpiece. At the same time, the self-tapping thread is used to tap the bottom hole until the cylindrical part 3 abuts against the surface of the workpiece. The heat generated during tapping is discharged from the gap 10 to avoid the high temperature affecting the installation structure strength between the external thread 5 and the workpiece. After the sleeve nut 1 is fixed, other screws are connected to the internal thread 4 for the installation of other brackets. It is suitable for industries such as machinery, furniture, sanitary ware, and electrical appliances.

[0029] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A self-extruding sleeve nut, comprising a sleeve nut (1), the sleeve nut (1) having a screw portion (2) and a cylindrical portion (3), the screw portion (2) having an internal thread (4) and an external thread (5) on its inner and outer sides respectively, the cylindrical portion (3) having a tightening groove (6) for attaching a screwdriver bit, and the tightening groove (6) communicating with the internal thread (4), characterized in that, The inner contour of the cross section of the screw part (2) is circular, and its outer contour is an arc triangle coaxially distributed with the cylindrical part (3). The internal thread (4) and the external thread (5) are respectively provided on the inner contour and the outer contour of the screw part (2).

2. The self-extruding sleeve nut according to claim 1, characterized in that: The outer contour of the screw part (2) is provided with three sets of circular arc surfaces a (7) distributed in a circle, and an arc surface b (8) connected between adjacent arc surfaces a (7). The arc surface b (8) rotates around the axis of the internal thread (4) to form a virtual cylinder (9). There is a gap (10) between the arc surface a (7) and the virtual cylinder (9).

3. The self-extruding sleeve nut according to claim 2, characterized in that: The inner contour of the tightening groove (6) is provided with protrusions (11) arranged in a circular pattern. The inner side of the protrusions (11) is provided with an arc surface c (12). The top of the protrusions (11) is provided with a chamfered surface (13). The arc surface c (12) is coaxially distributed with the cylindrical part (3).

4. A self-extruding sleeve nut according to claim 3, characterized in that: The diameter of the arc surface c (12) is greater than the root circle diameter of the internal thread (4).

5. A self-extruding sleeve nut according to claim 3, characterized in that: The inner contour of the tightening groove (6) is the same when rotated 120°.

6. A self-extruding sleeve nut according to any one of claims 2-5, characterized in that: The arc surface a (7) is provided with a chip removal groove (14), and the cylindrical part (3) is provided with a receiving groove (15) on the outside of the screw part (2).

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