Anti-falling expansion bolt structure

Abstract

The utility model discloses an anti -drop expansion bolt structure, it includes: the lower end surface of vice -tube upper end passes through the expansion pipe and is placed in the expansion pipe, vice -tube and expansion pipe clasp, screw lower end passes through expansion pipe and vice -tube, and the inside surface of screw is respectively with the inside surface of vice -tube screw connection, a plurality of long holes one with the center of expansion pipe as the axle evenly distributes on the outside of expansion pipe lower part, a plurality of clamping strip one with longitudinal even distribution is a group and has a plurality of groups, and a plurality of groups clamping strip one and adjacent two long holes one one -to -one correspondence, the lower end of clamping strip one with the outside of expansion pipe fixed connection, a plurality of clamping tooth evenly distributes between clamping strip one and expansion pipe, and the lower end of clamping tooth and clamping strip one fixed connection, a plurality of long holes two with the center of vice -tube as the axle evenly distributes on the outside of vice -tube lower part, and long hole two and long hole one's position dislocation. The utility model has the beneficial effect is: the purpose of better wall -grabbing force.

Description

Technical Field

[0001] This utility model relates to the technical field of expansion bolts, and in particular to an anti-loosening expansion bolt structure. Background Technology

[0002] Ordinary expansion bolts use an expansion tube that protrudes to tighten the screw between the bolt and the wall. However, to make the expansion tube protrude, some contact area must be sacrificed, which reduces the gripping force on the wall. Utility Model Content

[0003] This invention aims to overcome the shortcomings of insufficient wall-gripping force in existing technologies and provides a better anti-loosening expansion bolt structure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A structure for preventing the expansion bolt from falling off includes:

[0006] Expansion tubes are placed outside the expansion bolts;

[0007] The secondary tube, with its upper end passing through the lower end face of the expansion tube, is placed inside the expansion tube and is snapped into the expansion tube.

[0008] The screw has its lower end passing through the expansion tube and the secondary tube, and the screw is threaded to the inner surface of the expansion tube and the inner surface of the secondary tube, respectively.

[0009] Several elongated holes are evenly distributed on the outer surface of the lower part of the expansion tube, with the center of the expansion tube as the axis.

[0010] Several clips are arranged in a longitudinally uniform manner as a group, and there are several groups. Each group of clips corresponds one-to-one with two adjacent elongated holes. The lower end of each clip is fixedly connected to the outer side of the expansion tube.

[0011] Several locking teeth are evenly distributed between the locking strip and the expansion tube, and the lower end of the locking teeth is fixedly connected to the locking strip.

[0012] Several elongated holes II are evenly distributed on the outer surface of the lower part of the secondary tube with the center of the secondary tube as the axis, and the positions of the elongated holes II and the elongated holes I are misaligned.

[0013] When using it, first drill a hole in the wall that is slightly larger than the outer diameter of the expansion tube. Then insert the secondary tube into the tail of the expansion tube and into the drilled hole. Then screw the screw into the expansion tube and the secondary tube. The tighter you screw it in, the more the expansion tube with the locking strip will bulge outwards because of the first long hole. At the same time, the second long hole of the secondary tube is misaligned with the first long hole, causing the secondary tube to bulge outwards from the first long hole, which increases the embedding into the wall. After the expansion tube bulges outwards, the locking strip will be easier to insert into the wall, and the locking teeth on the first locking strip can further lock the wall, preventing the expansion tube from falling out easily, thus achieving better wall grip.

[0014] Preferably, a retaining ring is provided on the outer surface of the lower end of the secondary tube. The retaining ring is fixedly connected to the outer surface of the secondary tube and is positioned below the expansion tube. The outer diameter of the retaining ring is larger than the inner diameter of the expansion tube. A retaining stop is provided on the inner wall of the expansion tube and is positioned above the elongated hole. The retaining stop is fixedly connected to the expansion tube, and the outer diameter of the secondary tube is larger than the inner diameter of the retaining stop. The cooperation of the retaining ring and the retaining stop is necessary for the secondary tube to retract.

[0015] Preferably, the inner surface of the expansion tube is provided with a groove, which is positioned between two adjacent elongated holes. The outer surface of the secondary tube is provided with a retaining strip, which corresponds to the groove and is positioned within it. The secondary tube is engaged with the expansion tube through the cooperation of the groove and the retaining strip. The cooperation of the groove and the retaining strip allows the protruding part of the secondary tube to correspond to the position of the elongated hole.

[0016] Preferably, there is an angle between the locking strip and the expansion tube, the angle being less than 45 degrees. This allows the locking strip to better penetrate the wall when the expansion tube bulges.

[0017] Preferably, the length of the clips in a set gradually decreases from top to bottom. This makes it easier to insert the expansion tube.

[0018] Preferably, there is an angle between the locking teeth and the locking strip, and the angle is less than 90 degrees. This allows the locking teeth to better penetrate the wall when the expansion tube protrudes.

[0019] Preferably, the width of the first elongated hole is greater than the distance between two adjacent first elongated holes. This allows the protruding part of the secondary tube to pass through the first elongated hole and protrude outwards.

[0020] The beneficial effects of this utility model are: better wall grip; the cooperation of the retaining ring and the retaining block allows the secondary tube to retract; the cooperation of the retaining groove and the retaining strip allows the protruding part of the secondary tube to correspond to the position of the first long hole; when the expansion tube protrudes, the retaining strip and the retaining teeth can better penetrate into the wall; the expansion tube is easier to insert; and the protruding part of the secondary tube can pass through the first long hole and protrude outward. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] Figure 2 This is a cross-sectional view of the main view of this utility model;

[0023] Figure 3 yes Figure 2 A cross-sectional view of AA;

[0024] Figure 4 yes Figure 2 A magnified view of detail B;

[0025] Figure 5 yes Figure 2 A magnified view of detail C.

[0026] In the diagram: 1. Expansion tube, 2. Secondary tube, 3. Screw, 4. Long hole one, 5. Locking strip one, 6. Locking tooth, 7. Long hole two, 8. Locking ring, 9. Locking stop, 10. Locking strip two, 11. Locking groove. Detailed Implementation

[0027] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0028] like Figures 1 to 3 In one embodiment, an anti-loosening expansion bolt structure includes a secondary tube 2 whose upper end passes through the lower end face of an expansion tube 1 and is placed inside the expansion tube 1, with the secondary tube 2 and the expansion tube 1 being snapped together; a screw 3 whose lower end passes through the expansion tube 1 and the secondary tube 2, and the screw 3 is threadedly connected to the inner side of the expansion tube 1 and the inner side of the secondary tube 2 respectively; a plurality of elongated holes 4 evenly distributed around the center of the expansion tube 1 on the outer side of the lower part of the expansion tube 1; a plurality of locking strips 5 evenly distributed longitudinally in groups of several groups, with each group of locking strips 5 corresponding to two adjacent elongated holes 4, and the lower end of the locking strips 5 being fixedly connected to the outer side of the expansion tube 1; a plurality of locking teeth 6 evenly distributed between the locking strips 5 and the expansion tube 1, and the lower end of the locking teeth 6 being fixedly connected to the locking strips 5; and a plurality of elongated holes 7 evenly distributed around the center of the secondary tube 2 on the outer side of the lower part of the secondary tube 2, with the positions of the elongated holes 7 and the elongated holes 4 being staggered.

[0029] like Figure 2 , Figure 4 and Figure 5 As shown, the retaining ring 8 is placed below the expansion tube 1, and the outer diameter of the retaining ring 8 is larger than the inner diameter of the expansion tube 1. The retaining stop 9 is placed above the elongated hole 4 and is fixedly connected to the expansion tube 1. The outer diameter of the secondary tube 2 is larger than the inner diameter of the retaining stop 9.

[0030] like Figure 3As shown, the slot 11 is placed between two adjacent elongated holes 4. The outer side of the secondary tube 2 is provided with a second locking strip 10, which corresponds to the slot 11. The second locking strip 10 is placed in the slot 11, and the secondary tube 2 is engaged with the expansion tube 1 through the cooperation of the slot 11 and the second locking strip 10.

[0031] like Figure 1 and Figure 2 As shown, the angle between the card strip 5 and the expansion tube 1 is less than 45 degrees.

[0032] like Figure 2 As shown, the length of the card strip 5 in a group gradually decreases from top to bottom.

[0033] like Figure 1 and Figure 2 As shown, the included angle between the 6th tooth and the 5th strip is less than 90 degrees.

[0034] like Figure 3 As shown, the width of the elongated hole 4 is greater than the distance between two adjacent elongated holes 4.

[0035] In use, first drill a hole in the wall slightly larger than the outer diameter of the expansion tube 1. Then, insert the secondary tube 2 into the tail of the expansion tube 1 along the groove 11 using the second clamp 10. Use the retaining ring 8 to hold the bottom of the expansion tube 1 and then insert it into the drilled hole. Then, screw the screw 3 into the expansion tube 1 and the secondary tube 2. The tighter the screw, the more the expansion tube 1 will protrude outwards due to the long hole 4. At the same time, the long hole 7 and the long hole 4 of the secondary tube 2 are misaligned, and the secondary tube 2 holds against the retaining block 9, allowing the secondary tube 2 to pass through the long hole 4 and protrude outwards, increasing its embedding into the wall. After the expansion tube 1 protrudes outwards, the retaining strip 5 will be easier to insert into the wall, and the retaining teeth 6 on the retaining strip 5 can further hold the wall, preventing the expansion tube from easily falling out, thus achieving better wall grip.

Claims

1. A structure for preventing the loosening of expansion bolts, characterized in that, include: Expansion tube (1) is placed outside the expansion bolt; The secondary tube (2) passes through the lower end face of the expansion tube (1) and is placed inside the expansion tube (1). The secondary tube (2) is snapped into the expansion tube (1). The screw (3) passes through the expansion tube (1) and the secondary tube (2) at its lower end. The screw (3) is threaded to the inner side of the expansion tube (1) and the inner side of the secondary tube (2) respectively. Several elongated holes (4) are evenly distributed on the outer surface of the lower part of the expansion tube (1) with the center of the expansion tube (1) as the axis; Several card strips (5) are evenly distributed longitudinally as a group, and there are several groups. Several groups of card strips (5) correspond one-to-one with two adjacent long holes (4). The lower end of the card strip (5) is fixedly connected to the outer side of the expansion tube (1). Several teeth (6) are evenly distributed between the first locking strip (5) and the expansion tube (1), and the lower end of the teeth (6) is fixedly connected to the first locking strip (5); Several elongated holes 2 (7) are evenly distributed on the outer side of the lower part of the sub-tube (2) with the center of the sub-tube (2) as the axis. The positions of the elongated holes 2 (7) and the elongated holes 1 (4) are misaligned.

2. The anti-loosening expansion bolt structure according to claim 1, characterized in that, A retaining ring (8) is provided on the outer side of the lower end of the secondary tube (2). The retaining ring (8) is fixedly connected to the outer side of the secondary tube (2). The retaining ring (8) is placed below the expansion tube (1). The outer diameter of the retaining ring (8) is larger than the inner diameter of the expansion tube (1). A retaining block (9) is provided on the inner wall of the expansion tube (1). The retaining block (9) is placed above the first long hole (4). The retaining block (9) is fixedly connected to the expansion tube (1). The outer diameter of the secondary tube (2) is larger than the inner diameter of the retaining block (9).

3. The anti-loosening expansion bolt structure according to claim 2, characterized in that, The expansion tube (1) has a slot (11) on its inner side. The slot (11) is located between two adjacent elongated holes (4). The secondary tube (2) has a second locking strip (10) on its outer side. The second locking strip (10) corresponds to the slot (11). The second locking strip (10) is placed in the slot (11). The secondary tube (2) is engaged with the expansion tube (1) through the cooperation of the slot (11) and the second locking strip (10).

4. The anti-loosening expansion bolt structure according to claim 1, characterized in that, There is an angle between the card strip (5) and the expansion tube (1), and the angle is less than 45 degrees.

5. The anti-loosening expansion bolt structure according to claim 1, characterized in that, The length of the card strip 1 (5) in a group gradually decreases from top to bottom.

6. The anti-loosening expansion bolt structure according to claim 1, characterized in that, There is an angle between the tooth (6) and the strip (5), and the angle is less than 90 degrees.

7. The anti-loosening expansion bolt structure according to claim 1, characterized in that, The width of the first elongated hole (4) is greater than the distance between two adjacent first elongated holes (4).

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