Elastic fastening expansion bolt

Abstract

The utility model discloses an elastic fastening expansion bolt which comprises an expansion sleeve, a countersunk bolt and a nut, a plurality of openings are formed in the tail of the expansion sleeve, a reinforcing sleeve is installed on the inner wall of the expansion sleeve and located above the openings, a limiting circular ring is installed on the countersunk bolt, a telescopic spring is sleeved on the countersunk bolt, and the nut is sleeved on the limiting circular ring. The upper end of the telescopic spring is connected with the reinforcing sleeve, the lower end of the telescopic spring is connected with the limiting circular ring, the upper end of the reinforcing sleeve is connected with a connecting spring, the upper end of the connecting spring extends out of the expansion sleeve, and a flat washer is arranged between the upper end of the connecting spring and the nut. The utility model has the beneficial effects that no force is directly applied to the expansion sleeve, the damage to holes or the expansion sleeve caused by excessive expansion of the expansion sleeve is avoided, the deformation caused by bending of the expansion sleeve is avoided, the loosening phenomenon of the nut is avoided, the connection strength is improved, and the nut does not need to be rotated by a large margin; and thread slipping of the nut and the countersunk bolt is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of expansion bolts, in particular to an elastic fastening expansion bolt. Background Art

[0002] The expansion bolt is composed of a countersunk bolt, an expansion tube, a flat washer, a spring washer and a hexagonal nut. When in use, a hole of corresponding size is drilled on the fixed body with an impact drill, and then the bolt and expansion tube are installed into the hole. The nut is tightened to expand the bolt, expansion tube, mounting part and fixed body into one.

[0003] The utility model with application number CN202020591050.2 discloses an elastic fastening expansion bolt. The force of the nut is buffered by the elastic force of the spring, and the nut and the cross tube can be relatively fixed through the cooperation between the threaded rod, the threaded hole, the latch and the cross groove, that is, after the nut is positioned, it cannot be rotated, thereby improving the connection strength between the elastic fastening expansion bolt and the external reserved hole.

[0004] The above device rotates the nut to align the pin on the threaded rod with the transverse groove, and inserts the pin into the transverse groove to prevent the nut from rotating. The operation is cumbersome and time-consuming. When the nut is rotated to align the pin with the transverse groove, the nut rotates greatly, which can easily cause the nut and the thread to slip, thereby reducing the service life.

[0005] It should be noted that the above contents belong to the technical knowledge of the inventor and do not necessarily constitute prior art. Utility Model Content

[0006] The utility model aims to solve the above problems and designs an elastic fastening expansion bolt.

[0007] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An elastic fastening expansion bolt comprises an expansion sleeve, a countersunk bolt and a nut. The tail of the expansion sleeve is provided with multiple openings. A reinforcement sleeve is installed on the inner wall of the expansion sleeve, and the reinforcement sleeve is located above the opening. A limiting ring is installed on the countersunk bolt, and a telescopic spring is sleeved on the countersunk bolt. The upper end of the telescopic spring is connected to the reinforcement sleeve, and the lower end of the telescopic spring is connected to the limiting ring. The upper end of the reinforcement sleeve is connected to a connecting spring, and the upper end of the connecting spring extends out of the expansion sleeve. A flat washer is provided between the upper end of the connecting spring and the nut.

[0009] Further, a hexagonal groove is provided on the surface of the nut, a square groove is provided at the top end of the screw rod of the countersunk head bolt, a vertical threaded hole is provided in the square groove, a U-shaped plate is provided above the screw rod of the countersunk head bolt, the vertical arm end of the U-shaped plate is inserted into the hexagonal groove, a square rod is installed at the center of the U-shaped plate, the square rod is inserted into the square groove, and a fastening screw rod is threadedly connected to the U-shaped plate and the square rod, and the fastening screw rod passes through the square rod and is threadedly connected to the vertical threaded hole.

[0010] Further, serrated protrusions are provided around the tail of the expansion sleeve, and the serrated protrusions are located between adjacent openings.

[0011] Further, the inner diameter of the reinforcing sleeve is larger than the diameter of the countersunk head bolt, and the outer diameter of the limiting ring is the same as the inner diameter of the expansion sleeve.

[0012] Further, diagonal reinforcing ribs are installed on both inner sides of the U-shaped plate.

[0013] Further, the nut is a hexagonal flange nut, and the hexagonal groove is provided on the flange surface.

[0014] Compared with the prior art, the technical solution has the following beneficial effects:

[0015] The connecting spring applies a force to the expansion sleeve through the reinforcing sleeve. The nut will not be in direct contact with the expansion sleeve and will not directly apply a force to the expansion sleeve. When the countersunk head bolt moves outward to the expansion sleeve, the limiting ring applies a pressure to the telescopic spring, and a buffering effect is achieved through the telescopic spring to prevent the expansion sleeve from over-expanding to cause holes or damage to the expansion sleeve;

[0016] The strength of the expansion sleeve is increased through the reinforcing sleeve, which can limit the countersunk head bolt to prevent the expansion sleeve from bending and deforming, and increases the service life;

[0017] The square rod on the U-shaped plate is inserted into the square groove at the top end of the countersunk head bolt, and the vertical arm end of the U-shaped plate is inserted into the hexagonal groove. The fastening screw rod is tightened so that the fastening screw rod is threadedly connected to the vertical threaded hole, making the nut and the countersunk head bolt relatively fixed, preventing the nut from rotating, avoiding the loosening of the nut, improving the connection strength, and being simple, convenient and fast to install;

[0018] Align the vertical arm end of the U-shaped plate with the hexagonal groove. If the position of the vertical arm end of the U-shaped plate does not match the hexagonal groove, rotate the nut to make the position of the vertical arm end of the U-shaped plate match the hexagonal groove. There are three pairs of grooves in the hexagonal groove that can be aligned with the vertical arm end of the U-shaped plate. Just slightly rotate the nut, without the need to rotate the nut significantly, to avoid the thread slipping between the nut and the countersunk head bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1This is a schematic structural diagram of an elastic fastening expansion bolt according to the present utility model.

[0020] Figure 2 This is a schematic cross-sectional view of the expansion sleeve.

[0021] Figure 3 This is a connection state diagram of the U-shaped plate and the countersunk head bolt.

[0022] Figure 4 This is an enlarged top view of the nut.

[0023] In the figure: 1. Expansion sleeve; 2. Countersunk head bolt; 3. Nut; 4. Opening; 5. Reinforcing sleeve; 6. Limit ring; 7. Telescopic spring; 8. Connecting spring; 9. Flat washer; 10. Hexagonal groove; 11. Square groove; 12. Vertical threaded hole; 13. U-shaped plate; 14. Square rod; 15. Fastening screw; 16. Serrated convex block; 17. Oblique reinforcing rib. Specific embodiments

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, in the description of the present utility model, the meaning of "a plurality of" is two or more, unless otherwise specifically defined.

[0026] The present utility model provides as Figure 1-4An elastic fastening expansion bolt as shown includes an expansion sleeve 1, a countersunk head bolt 2 and a nut 3. Multiple openings 4 are provided at the tail of the expansion sleeve 1. A reinforcing sleeve 5 is installed on the inner wall of the expansion sleeve 1, and the reinforcing sleeve 5 is located above the openings 4. A limit ring 6 is installed on the countersunk head bolt 2, and a telescopic spring 7 is sleeved on the countersunk head bolt 2. The upper end of the telescopic spring 7 is connected to the reinforcing sleeve 5, and the lower end of the telescopic spring 7 is connected to the limit ring 6. A connecting spring 8 is connected to the upper end of the reinforcing sleeve 5, and the upper end of the connecting spring 8 extends out of the expansion sleeve 1. A flat washer 9 is provided between the upper end of the connecting spring 8 and the nut 3.

[0027] After inserting the expansion sleeve 1 into the drilled hole, use a tool to turn the nut 3. The nut 3 is threadedly connected to the countersunk head bolt 2, causing the countersunk head bolt 2 to move outward from the expansion sleeve 1. Pressure is exerted on the connecting spring 8 through the flat washer 9, and the connecting spring 8 exerts a force on the expansion sleeve 1 through the reinforcing sleeve 5. The nut 3 does not directly contact the expansion sleeve 1 and does not directly exert a force on the expansion sleeve 1. When the countersunk head bolt 2 moves outward from the expansion sleeve 1, the limit ring 6 exerts pressure on the telescopic spring 7, and a buffering effect is achieved through the telescopic spring 7 to prevent the expansion sleeve 1 from over-expanding and causing damage to the hole or the expansion sleeve 1. The strength of the expansion sleeve 1 is increased through the reinforcing sleeve 5, and the countersunk head bolt 2 can be limited to prevent the expansion sleeve 1 from bending and deforming, increasing the service life. The countersunk head end of the countersunk head bolt 2撑开 the tail of the expansion sleeve 1 to closely fit the inner wall of the hole.

[0028] Refer to the attached Figure 3 and the attached Figure 4 , a hexagonal groove 10 is provided on the surface of the nut 3, a square groove 11 is provided at the top of the screw rod of the countersunk head bolt 2, a vertical threaded hole 12 is provided in the square groove 11, a C-shaped plate 13 is provided above the screw rod of the countersunk head bolt 2, the vertical arm end of the C-shaped plate 13 is inserted into the hexagonal groove 10, a square rod 14 is installed at the center of the C-shaped plate 13, the square rod 14 is inserted into the square groove 11, and a fastening screw rod 15 is threadedly connected to the C-shaped plate 13 and the square rod 14. The fastening screw rod 15 passes through the square rod 14 and is threadedly connected to the vertical threaded hole 12.

[0029] After the expansion casing 1 is fixed, insert the square rod 14 on the C-shaped plate 13 into the square groove 11 at the top end of the countersunk head bolt 2, and align the vertical arm end of the C-shaped plate 13 with the hexagonal groove 10. If the positions do not match, rotate the nut 3 to make the vertical arm end of the C-shaped plate 13 match the position of the hexagonal groove 10. There are three pairs of grooves in the hexagonal groove 10 that can be aligned with the vertical arm end of the C-shaped plate 13. Just slightly rotate the nut 3, and there is no need to rotate the nut 3 significantly to avoid the thread slipping between the nut 3 and the countersunk head bolt 2. Insert the vertical arm end of the C-shaped plate 13 into the hexagonal groove 10, and tighten the fastening screw rod 15 so that the fastening screw rod 15 is threadedly connected to the vertical threaded hole 12, making the nut 3 and the countersunk head bolt 2 relatively fixed and preventing the nut 3 from rotating, thus avoiding the loosening of the nut 3 and improving the connection strength.

[0030] Refer to the attached Figure 1 and the attached Figure 2 of the specification. Around the tail of the expansion casing 1, there are serrated protrusions 16, and the serrated protrusions 16 are located between adjacent openings 4.

[0031] After the tail of the expansion casing 1 is expanded, the serrated protrusions 16 are in contact with the inner wall of the hole, increasing the friction force, preventing the expansion casing 1 from rotating and loosening.

[0032] Refer to the attached Figure 2 of the specification. The inner diameter of the reinforcing sleeve 5 is larger than the diameter of the countersunk head bolt 2, and the outer diameter of the limiting ring 6 is the same as the inner diameter of the expansion casing 1.

[0033] The inner ring of the reinforcing sleeve 5 guides the countersunk head bolt 2, and the outer ring of the limiting ring 6 fits with the inner wall of the expansion casing 1, which can prevent the countersunk head bolt 2 from shaking.

[0034] Refer to the attached Figure 1 and the attached Figure 2 of the specification. Figure 3 On both sides inside the C-shaped plate 13, there are oblique reinforcing ribs 17 installed.

[0035] The strength of the C-shaped plate 13 is increased through the oblique reinforcing ribs 17, preventing the vertical arm end of the C-shaped plate 13 from bending and deforming.

[0036] Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. An elastic fastening expansion bolt, comprising an expansion sleeve (1), a countersunk bolt (2) and a nut (3), wherein a plurality of openings (4) are provided at the rear of the expansion sleeve (1), and characterized in that: A reinforcing sleeve (5) is installed on the inner wall of the expansion sleeve (1), and the reinforcing sleeve (5) is located above the opening (4). A limiting ring (6) is installed on the countersunk bolt (2), and a telescopic spring (7) is sleeved on the countersunk bolt (2). The upper end of the telescopic spring (7) is connected to the reinforcing sleeve (5), and the lower end of the telescopic spring (7) is connected to the limiting ring (6). The upper end of the reinforcing sleeve (5) is connected to a connecting spring (8), and the upper end of the connecting spring (8) extends out of the expansion sleeve (1). A flat washer (9) is provided between the upper end of the connecting spring (8) and the nut (3).

2. The elastic fastening expansion bolt according to claim 1, characterized in that: A hexagonal groove (10) is provided on the surface of the nut (3); a square groove (11) is provided on the top of the screw rod of the countersunk bolt (2); a vertical threaded hole (12) is provided in the square groove (11); a shaped plate (13) is provided above the screw rod of the countersunk bolt (2); a vertical arm end of the shaped plate (13) is inserted into the hexagonal groove (10); a square rod (14) is installed at the center of the shaped plate (13); the square rod (14) is inserted into the square groove (11); a fastening screw (15) is threadedly connected to the shaped plate (13) and the square rod (14); the fastening screw (15) passes through the square rod (14) and is threadedly connected to the vertical threaded hole (12).

3. The elastic fastening expansion bolt according to claim 1, characterized in that: The rear portion of the expansion sleeve (1) is provided with sawtooth-shaped protrusions (16) around its periphery, and the sawtooth-shaped protrusions (16) are located between adjacent openings (4).

4. The elastic fastening expansion bolt according to claim 1, characterized in that: The inner diameter of the reinforcing sleeve (5) is larger than the diameter of the countersunk bolt (2), and the outer diameter of the limiting ring (6) is the same as the inner diameter of the expansion sleeve (1).

5. The elastic fastening expansion bolt according to claim 2, characterized in that: Oblique reinforcing ribs (17) are installed on both sides of the interior of the shaped plate (13).

6. The elastic fastening expansion bolt according to claim 2, characterized in that: The nut (3) is a hexagonal flange surface nut, and the hexagonal groove (10) is provided on the flange surface.

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