An insert expansion screw

Abstract

The utility model discloses an insertion type expansion screw relates to screw technical field. The utility model discloses a screw rod, the rear end fixed setting of screw rod is limited to end portion, is provided with antiskid tooth on the circumference lateral wall of limited end portion, and the active sleeve joint of expansion sleeve pipe has on screw rod, and the front end of expansion sleeve pipe is provided with first flounce piece, and the active sleeve joint of screw rod of expansion sleeve pipe front side has intermediate sleeve, and the rear end of intermediate sleeve is provided with first extrusion conical surface, and the front end of intermediate sleeve is provided with second flounce piece. The utility model discloses make the front end of first flounce piece and go up and abut on the hole wall outward, and make the front end of second flounce piece and go up and abut on the hole wall outward, can pass through double limit, prevent expansion screw and draw out from the inside of drilling under the action of external force better, make the use of expansion screw can be more stable and reliable, set up antiskid tooth on the circumference lateral wall of limited end portion, can increase the friction between limited end portion and hole wall, prevent screw rod with locknut together rotates.

Description

Technical Field

[0001] This utility model belongs to the field of screw technology, and in particular relates to an insert-type expansion screw. Background Technology

[0002] Insert-type expansion screws, also known as expansion bolts or expansion studs, are fasteners that use a wedge-shaped inclination to cause expansion, generating frictional gripping force to achieve a fixing effect. When using ordinary expansion screws, the screw is inserted into a pre-drilled hole, and then the nut on the screw is turned using a tool. The nut rotates on the screw's threaded shaft, causing the cylinder to expand or the tabs to bend and press against the hole wall, thus securing the screw. A search revealed that patent application number 202422129733.7 discloses an expansion tube and a sleeve. The sleeve is located above the expansion tube. The upper part of the expansion tube has multiple pry bars arranged in a ring array. The lower outer wall of the sleeve abuts against the upper inner wall of the pry bars. A screw is slidably inserted through the sleeve. The top end of the screw extends to the top of the sleeve and is fixedly connected to an end cap. A fixing mechanism is provided at the bottom of the expansion tube. A nut is connected to the bottom of the expansion tube through the fixing mechanism. The bottom end of the screw passes through the expansion tube and the nut and extends to the bottom of the nut. The screw and the nut are threadedly connected. The fixing mechanism includes a fixing box fixed on both sides of the bottom surface of the expansion tube. An insert block is slidably arranged in the fixing box. One end of the insert block passes through the fixing box and extends to the outside of the fixing box, where a pull plate is fixedly connected. A sliding plate is fixedly connected to the insert block. The sliding plate is slidably connected in the fixing box. A slot is opened on the nut. One end of the insert block passes through the fixing box and is inserted into the slot. A spring is sleeved on the insert block.

[0003] However, in actual use, the applicant found that when fixing the screw inside the wall hole, it was done by driving the sleeve to make the pry bar on the screw tilt outward and abut against the inner wall of the hole. This fixing method only relies on the friction between a single pry bar and the hole wall, which makes the fixing of the expansion screw not stable and reliable. In view of this, we propose an insert-type expansion screw. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0005] This utility model relates to an insert-type expansion screw, comprising a screw rod, a limiting end fixedly provided at the rear end of the screw rod, anti-slip teeth provided on the peripheral sidewall of the limiting end, an expansion sleeve movably sleeved on the screw rod, a first flap provided at the front end of the expansion sleeve, an intermediate sleeve movably sleeved on the screw rod in front of the expansion sleeve, a first compression cone surface provided at the rear end of the intermediate sleeve, a second flap provided at the front end of the intermediate sleeve, a compression sleeve movably sleeved on the screw rod in front of the intermediate sleeve, a second compression cone surface provided at the rear end of the compression sleeve, a limiting plate provided at the rear end of the compression sleeve, and an anti-loosening nut threaded onto the screw rod in front of the compression sleeve.

[0006] Preferably, the anti-slip teeth on the peripheral sidewall of the limiting end are arranged in a circular array.

[0007] Preferably, the rear end of the expansion sleeve abuts against the limiting end, and the first flap at the front end of the expansion sleeve is provided with several flaps in a ring.

[0008] Preferably, the front end of the first warp piece abuts against the first extrusion cone surface, and the second warp piece at the front end of the intermediate sleeve is arranged in a circular array of several pieces.

[0009] Preferably, the front end of the second pry bar abuts against the second extrusion cone surface, and the anti-loosening nut abuts against the end face of the limiting plate.

[0010] Preferably, the inner diameter of the rear end of the expansion sleeve, the inner diameter of the rear end of the intermediate sleeve, and the inner diameter of the extrusion sleeve are the same, the inner diameter of the front end of the expansion sleeve is larger than the inner diameter of the rear end of the expansion sleeve, and the inner diameter of the front end of the intermediate sleeve is larger than the inner diameter of the rear end of the intermediate sleeve.

[0011] This utility model has the following beneficial effects:

[0012] This utility model discloses an insertable expansion screw. By having the front end of the first wedge bend outward and abut against the hole wall, and the front end of the second wedge bend outward and abut against the hole wall, the expansion screw can be better prevented from being pulled out of the drilled hole under the action of external force through double limiting. This makes the use of the expansion screw more stable and reliable. By setting anti-slip teeth on the peripheral side wall of the limiting end, the friction between the limiting end and the hole wall can be increased, preventing the screw from rotating with the anti-loosening nut, resulting in better performance. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of an insert-type expansion screw according to the present invention;

[0015] Figure 2 This is an exploded view of an insert-type expansion screw according to the present invention;

[0016] Figure 3 This is a cross-sectional view of an insertable expansion screw according to the present invention.

[0017] The attached diagram lists the components represented by each number as follows:

[0018] 1. Screw; 11. Limiting end; 111. Anti-slip teeth; 2. Expansion sleeve; 21. First ferrule; 3. Intermediate sleeve; 31. First extrusion cone surface; 32. Second ferrule; 4. Extrusion sleeve; 41. Second extrusion cone surface; 42. Limiting plate; 5. Anti-loosening nut. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figure 1-3 As shown, this utility model provides a technical solution:

[0021] An insertable expansion screw includes a screw 1, with a limiting end 11 fixedly provided at the rear end of the screw 1. Anti-slip teeth 111 are provided on the peripheral sidewall of the limiting end 11. The anti-slip teeth 111 on the peripheral sidewall of the limiting end 11 are arranged in a circular array. By providing anti-slip teeth 111 on the peripheral sidewall of the limiting end 11, the friction between the limiting end 11 and the hole wall can be increased, preventing the screw 1 from rotating together with the anti-loosening nut 5, resulting in better performance.

[0022] An expansion sleeve 2 is movably sleeved on a screw 1. The rear end of the expansion sleeve 2 abuts against a limiting end 11. A first flap 21 is provided at the front end of the expansion sleeve 2. Several flaps 21 at the front end of the expansion sleeve 2 are arranged in a ring. An intermediate sleeve 3 is movably sleeved on the screw 1 at the front side of the expansion sleeve 2. A first extrusion cone surface 31 is provided at the rear end of the intermediate sleeve 3. The front end of the first flap 21 abuts against the first extrusion cone surface 31. A second flap 32 is provided at the front end of the intermediate sleeve 3. Several second flaps 32 at the front end of the intermediate sleeve 3 are arranged in a ring array. An extrusion sleeve 4 is movably sleeved on the screw 1 at the front side of the intermediate sleeve 3. A second extrusion cone surface 41 is provided at the rear end of the extrusion sleeve 4. The front end of the second flap 32 abuts against the second extrusion cone surface 41. By causing the front end of the first flap 21 to bend outward and abut against the hole wall, and causing the front end of the second flap 32 to bend outward... The expansion sleeve 4 is raised and abuts against the hole wall, which can better prevent the expansion screw from being pulled out of the drilled hole under the action of external force through double limiting, so that the use of the expansion screw can be more stable and reliable. The rear end of the compression sleeve 4 is provided with a limiting plate 42. The inner diameter of the rear end of the expansion sleeve 2 and the inner diameter of the rear end of the intermediate sleeve 3 are the same as the inner diameter of the compression sleeve 4, and they are all adapted to the screw 1. This can make the expansion sleeve 2, intermediate sleeve 3 and compression sleeve 4 sleeved on the screw 1 more stable and prevent them from shaking too much. The inner diameter of the front end of the expansion sleeve 2 is larger than the inner diameter of the rear end of the expansion sleeve 2, and the inner diameter of the front end of the intermediate sleeve 3 is larger than the inner diameter of the rear end of the intermediate sleeve 3. The screw 1 on the front side of the compression sleeve 4 is threaded with a lock nut 5. The lock nut 5 abuts against the end face of the limiting plate 42. By rotating the lock nut 5, the compression sleeve 4 can be pushed towards the limiting end 11.

[0023] Working principle: In use, insert the insert-type expansion screw into the drilled hole on the wall, and place the expansion sleeve 2 and the intermediate sleeve 3 completely inside the drilled hole. Then, rotate the anti-loosening nut 5 clockwise, so that the anti-loosening nut 5 moves towards the limiting end 11. During this process, the anti-slip teeth 111 can contact the hole wall and prevent the screw 1 from rotating with the anti-loosening nut 5. At this time, the movement of the anti-loosening nut 5 towards the limiting end 11 can push the compression sleeve 4 towards the limiting end 11. The movement of the compression sleeve 4 can push the intermediate sleeve 3 towards the limiting end 11 and drive the first compression cone surface 31 to compress the first pry bar 21, so that the first pry bar 21 pries outward and abuts against the hole wall. At the same time, the second compression cone surface 41 can compress the second pry bar 32 at the front end of the intermediate sleeve 3, so that the second pry bar 32 pries outward and abuts against the hole wall. Thus, the expansion screw can be effectively limited in the drilled hole on the wall through the first pry bar 21 and the second pry bar 32, completing the installation and fixing of the expansion screw.

[0024] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0025] The above are merely preferred embodiments of the present utility model and do not limit the present utility model. Any modifications to the technical solutions described in the foregoing embodiments or equivalent substitutions of some of the technical features shall fall within the protection scope of the present utility model.

Claims

1. An insert-type expansion screw, comprising a screw (1), characterized in that: The screw (1) has a fixed limiting end (11) at its rear end. The limiting end (11) has anti-slip teeth (111) on its peripheral sidewall. An expansion sleeve (2) is movably sleeved on the screw (1). A first pry bar (21) is provided at the front end of the expansion sleeve (2). An intermediate sleeve (3) is movably sleeved on the screw (1) in front of the expansion sleeve (2). A first extrusion cone surface (31) is provided at the rear end of the intermediate sleeve (3). A second pry bar (32) is provided at the front end of the intermediate sleeve (3). An extrusion sleeve (4) is movably sleeved on the screw (1) in front of the intermediate sleeve (3). A second extrusion cone surface (41) is provided at the rear end of the extrusion sleeve (4). A limiting plate (42) is provided at the rear end of the extrusion sleeve (4). An anti-loosening nut (5) is threaded onto the screw (1) in front of the extrusion sleeve (4).

2. The insert-type expansion screw according to claim 1, characterized in that, The anti-slip teeth (111) on the side wall of the limiting end (11) are arranged in a ring array.

3. The insert-type expansion screw according to claim 1, characterized in that, The rear end of the expansion sleeve (2) abuts against the limiting end (11), and the first flap (21) at the front end of the expansion sleeve (2) is provided with several flaps in a ring.

4. The insert-type expansion screw according to claim 1, characterized in that, The front end of the first warp piece (21) abuts against the first extrusion cone surface (31), and the second warp piece (32) at the front end of the intermediate sleeve (3) is arranged in a ring array with several pieces.

5. An insert-type expansion screw according to claim 1, characterized in that, The front end of the second pry bar (32) abuts against the second extrusion cone surface (41), and the anti-loosening nut (5) abuts against the end face of the limiting plate (42).

6. The insert-type expansion screw according to claim 1, characterized in that, The inner diameter of the rear end of the expansion sleeve (2), the inner diameter of the rear end of the intermediate sleeve (3), and the inner diameter of the extrusion sleeve (4) are the same. The inner diameter of the front end of the expansion sleeve (2) is greater than the inner diameter of the rear end of the expansion sleeve (2), and the inner diameter of the front end of the intermediate sleeve (3) is greater than the inner diameter of the rear end of the intermediate sleeve (3).

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