Expansion screw with telescopic outer pipe

Abstract

The utility model relates to the technical field of expansion screws, in particular to an expansion screw with a telescopic outer pipe, which comprises an expansion telescopic outer pipe and a long bolt, the expansion telescopic outer pipe comprises a rectangular insertion pipe and a rectangular movable block, and the right side of the rectangular movable block is provided with a threaded hole for threaded connection of the long bolt. First grooves are formed in the left ends of the upper side and the lower side of the rectangular insertion pipe correspondingly, second grooves are formed in the right ends of the upper side and the lower side of the rectangular movable block correspondingly, anti-disengaging strips are arranged between the first grooves and the second grooves which are oppositely arranged left and right, two buckles are arranged on the right side of the rectangular movable block, and two U-shaped butt joint grooves are formed in the front side and the rear side of the rectangular insertion pipe correspondingly. A clamping block matched with the buckle is arranged in the U-shaped butt joint groove. According to the expansion screw with the telescopic outer pipe, the rectangular movable block and the rectangular insertion pipe are still kept in original positions after being disassembled and assembled for multiple times through limiting cooperation of the buckle and the clamping block, the installation difficulty caused by threaded hole dislocation is avoided, and the long-term use stability is improved.

Description

Technical Field

[0001] This utility model relates to the field of expansion screw technology, specifically an expansion screw with a telescopic outer tube. Background Technology

[0002] Modern home decoration commonly uses gypsum board or other lightweight panels for partition walls or ceiling decoration. These structures create hollow walls or similar hollow structures. When installing junction boxes, electrical switches, or other items on these hollow walls, specialized fixing devices are often required. However, traditional ordinary screws and expansion screws are ineffective in fixing these hollow walls, easily leading to loosening, detachment, or even failure to secure them properly. This is mainly because hollow walls lack sufficient structural strength to withstand external forces, thus necessitating a new fixing solution to address this technical challenge.

[0003] Patent CN213235710U discloses an expansion screw for installing hollow core wall panels, including a left expansion wing and a right expansion wing. The left and right expansion wings are rotatably connected to a connecting piece by a pin. The right expansion wing has a through hole at the center of its rightmost end, and the left expansion wing has a hexagonal nut at the center of its left end. The through hole and the hexagonal nut contain mounting bolts. Both the left and right expansion wings are two-part structures with a bendable groove at the base of the two-part structure. The center lines of the through hole and the hexagonal nut coincide with each other.

[0004] In the aforementioned prior art, rotating the mounting bolt moves the hexagonal nut towards the through hole, forcing the left and right expansion wings to bulge outwards at the connecting piece, thus achieving the contraction of the outer tube and its secure fixation to the hollow wall. However, during repeated disassembly and assembly, the left and right expansion wings may bend under rotational force, causing misalignment between the hexagonal nut of the left expansion wing and the through hole. This results in the hexagonal nut failing to remain directly behind the through hole after multiple disassemblies, affecting the smooth connection of the mounting bolt. To address this issue, we propose an expansion bolt with a telescopic outer tube, aiming to improve installation stability and reliability and reduce structural degradation caused by repeated use. Utility Model Content

[0005] The purpose of this invention is to provide an expansion screw with a telescopic outer tube to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] An expansion bolt with a telescopic outer tube includes an expansion telescopic outer tube and a long bolt. The expansion telescopic outer tube includes a rectangular insert and a rectangular movable block. The expansion telescopic outer tube is inserted into a hole in the wall. The rectangular insert is inserted into the wall hole and carries an anti-detachment strip and an anti-rotation plate. The rectangular movable block cooperates with the long bolt through a threaded hole, causing the anti-detachment strip to deform. A circular pressure plate is provided on the right side of the rectangular insert, which presses against the wall. The circular pressure plate guides the long bolt and disperses external pressure through a mounting hole. A mounting hole is provided in the middle of the right side of the circular pressure plate for the threaded end of the long bolt to pass through, providing an entry channel for the long bolt. A through hole is provided in the middle of the right side of the rectangular insert, communicating with the mounting hole. A threaded hole is provided in the middle of the right side of the rectangular movable block for the long bolt to be threaded. The threaded hole converts the rotation of the long bolt into linear displacement. The threaded end of the long bolt passes through the mounting hole and the through hole in sequence and is threadedly connected to the threaded hole. When the long bolt is tightened, the rectangular movable block moves towards the rectangular insert under the action of the long bolt.

[0008] The rectangular insertion tube has a first groove on the left end of both the upper and lower sides. The first groove fixes the right end of the anti-detachment strip and controls the deformation direction. The rectangular movable block has a second groove on the right end of both the upper and lower sides. The second groove fixes the left end of the anti-detachment strip and controls the deformation direction. An anti-detachment strip is provided between the first and second grooves that are arranged opposite to each other. The anti-detachment strip bulges outward by deformation to enhance the friction with the inner side of the hollow wall and fix the expansion and contraction outer tube to the wall surface.

[0009] The rectangular movable block has buckles on its right side and near the bottom front and rear ends. The rectangular insertion tube has U-shaped docking grooves on its front and rear sides and near the bottom left side. The U-shaped docking grooves have locking blocks that fit the buckles. The buckles and locking blocks engage to fix the position of the rectangular insertion tube and the rectangular movable block, thereby ensuring that the position of the rectangular movable block remains unchanged after the long bolt is disassembled and reassembled multiple times.

[0010] Preferably, the rectangular insertion tube is located directly to the right of the rectangular movable block, and when the rectangular movable block moves toward the rectangular insertion tube, the middle part of the anti-detachment strip bulges outward.

[0011] Preferably, a first deformation groove is provided on the outer side of the anti-detachment strip and near the left and right ends. The first deformation groove guides the anti-detachment strip to bend and deform outward. A second deformation groove is provided in the middle of the inner side of the anti-detachment strip. The second deformation groove guides the middle of the anti-detachment strip to bulge outward.

[0012] Preferably, the left end of the anti-detachment strip is adhered to the left side of the inner wall of the second groove, and the right end of the anti-detachment strip is adhered to the right side of the inner wall of the first groove.

[0013] Preferably, four anti-rotation plates are provided between the rectangular insertion tube and the circular pressure plate in a ring array. The anti-rotation plates are inserted into the wall holes to prevent the circular pressure plate from rotating and shifting when the bolts are tightened.

[0014] Preferably, the rectangular insertion tube is provided with positioning rods on the left side and near the front and rear ends of the top. The length of the positioning rods is less than the length of the long bolts, and the positioning rods pass through the positioning holes to ensure that the movement trajectory is aligned.

[0015] Preferably, positioning holes are provided on the right side of the rectangular movable block and near the front and rear ends of the top. The two positioning rods pass through the two positioning holes respectively, and the positioning holes and positioning rods cooperate to ensure axial alignment.

[0016] Compared with the prior art, the beneficial effects of this utility model are:

[0017] 1. This expansion bolt with telescopic outer tube, through the deformation expansion design of the anti-loosening strip, causes the anti-loosening strip to bulge outward evenly when the long bolt is tightened, which significantly enhances the friction with the inner side of the hollow wall and avoids the loosening or falling off of traditional expansion bolts due to insufficient support.

[0018] 2. The expansion screw with telescopic outer tube uses the limiting cooperation of the buckle and the locking block to ensure that the rectangular movable block and the rectangular insertion tube remain in their original positions after multiple disassemblies and reassemblies, avoiding installation difficulties caused by misalignment of the threaded holes and improving long-term stability.

[0019] 3. The expansion bolt with telescopic outer tube has an anti-rotation plate embedded in the wall hole, which effectively suppresses the rotation of the circular pressure plate when the bolt is tightened; the axial cooperation between the positioning rod and the positioning hole ensures the accurate movement trajectory of the rectangular movable block and avoids deformation failure caused by offset. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall structure of this utility model in use.

[0022] Figure 3 This is a schematic diagram of the expansion and telescopic outer tube structure in this utility model;

[0023] Figure 4 This is a partial structural diagram of the expansion and telescopic outer tube in this utility model;

[0024] Figure 5 This is a partial structural schematic diagram of the present invention;

[0025] Figure 6 This is a schematic diagram of the assembly structure of the rectangular insertion tube and the rectangular movable block in this utility model;

[0026] In the diagram: 1. Expansion and telescopic outer tube; 10. Rectangular insert; 100. Through hole; 101. First groove; 102. U-shaped docking groove; 103. Locking block; 11. Rectangular movable block; 110. Threaded hole; 111. Second groove; 112. Positioning hole; 113. Buckle; 12. Circular pressure plate; 120. Mounting hole; 13. Anti-detachment strip; 130. First deformation groove; 131. Second deformation groove; 14. Anti-rotation plate; 15. Positioning rod; 2. Long bolt. Detailed Implementation

[0027] 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 of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0029] Please see Figures 1-6 This utility model provides a technical solution:

[0030] An expansion bolt with a telescopic outer tube includes an expansion telescopic outer tube 1 and a long bolt 2. The expansion telescopic outer tube 1 includes a rectangular insert 10 and a rectangular movable block 11. The expansion telescopic outer tube 1 is inserted into a hole in the wall. The rectangular insert 10 is inserted into the wall hole and carries the anti-detachment strip 13 and the anti-rotation plate 14. The rectangular movable block 11 cooperates with the long bolt 2 through a threaded hole 110, causing the anti-detachment strip 13 to deform. A circular pressure plate 12 is provided on the right side of the rectangular insert 10. The circular pressure plate 12 presses against the wall. The circular pressure plate 12 guides the long bolt 2 through a mounting hole 120 and disperses external pressure. A supply hole is provided in the middle of the right side of the circular pressure plate 12. The mounting hole 120 through which the threaded end of the long bolt 2 passes provides an entry channel for the long bolt 2. A through hole 100 communicating with the mounting hole 120 is opened in the middle of the right side of the rectangular insertion tube 10. A threaded hole 110 for threaded connection of the long bolt 2 is opened in the middle of the right side of the rectangular movable block 11. The threaded hole 110 converts the rotation of the long bolt 2 into linear displacement. The threaded end of the long bolt 2 passes through the mounting hole 120 and the through hole 100 in sequence and is threadedly connected to the threaded hole 110. When the long bolt 2 is tightened, the rectangular movable block 11 moves toward the rectangular insertion tube 10 under the action of the long bolt 2.

[0031] The left ends of both the upper and lower sides of the rectangular insertion tube 10 are provided with a first groove 101. The first groove 101 fixes the right end of the anti-detachment strip 13 and controls the deformation direction. The right ends of both the upper and lower sides of the rectangular movable block 11 are provided with a second groove 111. The second groove 111 fixes the left end of the anti-detachment strip 13 and controls the deformation direction. The anti-detachment strip 13 is provided between the first groove 101 and the second groove 111 which are arranged opposite to each other. The anti-detachment strip 13 bulges outward by deformation to enhance the friction with the inner side of the hollow wall and fix the expansion and telescopic outer tube 1 to the wall surface.

[0032] The rectangular movable block 11 has a buckle 113 on the right side and near the bottom front and rear ends. The rectangular insertion tube 10 has a U-shaped docking groove 102 on the front and rear sides and near the bottom left side. The U-shaped docking groove 102 has a locking block 103 that matches the buckle 113. The buckle 113 and the locking block 103 engage to fix the position of the rectangular insertion tube 10 and the rectangular movable block 11, thereby ensuring that the position of the rectangular movable block 11 remains unchanged after the long bolt 2 is disassembled and reassembled multiple times.

[0033] In this embodiment, the rectangular insertion tube 10 is located directly to the right of the rectangular movable block 11. When the rectangular movable block 11 moves toward the rectangular insertion tube 10, the middle part of the anti-dislodgement strip 13 bulges outward.

[0034] Specifically, a first deformation groove 130 is provided on the outer side of the anti-slip strip 13 and near the left and right ends. The first deformation groove 130 guides the anti-slip strip 13 to bend and deform outward. A second deformation groove 131 is provided in the middle of the inner side of the anti-slip strip 13. The second deformation groove 131 guides the middle of the anti-slip strip 13 to bulge outward.

[0035] Furthermore, the left end of the anti-detachment strip 13 is adhered to the left side of the inner wall of the second groove 111, and the right end of the anti-detachment strip 13 is adhered to the right side of the inner wall of the first groove 101.

[0036] Furthermore, four anti-rotation plates 14 arranged in a ring array are provided between the rectangular insertion tube 10 and the circular pressure plate 12. The anti-rotation plates 14 are inserted into the wall holes to prevent the circular pressure plate 12 from rotating and shifting when the bolts are tightened.

[0037] Furthermore, positioning rods 15 are provided on the left side of the rectangular insertion tube 10 and at both ends near the top. The length of the positioning rods 15 is less than the length of the long bolts 2. The positioning rods 15 pass through the positioning holes 112 to ensure that the movement trajectory is aligned.

[0038] Furthermore, positioning holes 112 are provided on the right side of the rectangular movable block 11, near the front and rear ends of the top. Two positioning rods 15 pass through the two positioning holes 112 respectively, and the positioning holes 112 and positioning rods 15 cooperate to ensure axial alignment.

[0039] In this embodiment, the expansion bolt with a telescopic outer tube is used by first inserting the telescopic outer tube 1 into a pre-set mounting hole in the hollow wall, ensuring that the rectangular insert 10 of the telescopic outer tube 1 is fully embedded in the hole, while ensuring that the circular pressure plate 12 is tightly against the wall. Then, the threaded end of the long bolt 2 is passed through the mounting hole 120 of the circular pressure plate 12 and the through hole 100 of the rectangular insert 10, and threadedly connected to the threaded hole 110 of the rectangular movable block 11. When the long bolt 2 is tightened, the rotational force of the long bolt 2 is converted into linear displacement through the threaded hole 110, driving the rectangular movable block 11 to move towards the rectangular insert 10. At this time, the anti-disengagement strip between the first groove 101 and the second groove 111 is engaged. 13 Under the action of compression, the first deformation groove 130 and the second deformation groove 131 guide the deformation to bulge outward evenly, and fit tightly against the inner side of the hollow wall to enhance the friction. At the same time, the buckle 113 at the bottom of the rectangular movable block 11 engages with the buckle 103 in the U-shaped docking groove 102 of the rectangular insert 10 to ensure that the relative positions of the two are fixed and to avoid misalignment after repeated disassembly and assembly. During the tightening process, the anti-rotation plate 14 is embedded in the wall hole to prevent the circular pressure plate 12 from rotating and shifting, while the positioning rod 15 at the top of the rectangular insert 10 passes through the positioning hole 112 of the rectangular movable block 11 to ensure that the movement trajectory is always axially aligned, and finally achieves the stable fixation of the expansion and contraction outer tube 1 in the hollow wall.

[0040] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. Expansion screw with telescopic outer tube, comprising an expansion telescopic outer tube (1) and a long bolt (2), characterized in that: The expansion telescopic outer tube (1) comprises a rectangular insertion tube (10) and a rectangular movable block (11), the right side of the rectangular insertion tube (10) is provided with a circular pressing plate (12), the middle part of the right side of the circular pressing plate (12) is provided with a mounting hole (120) for the threaded end of a long bolt (2) to pass through, the middle part of the right side of the rectangular insertion tube (10) is provided with a through hole (100) in communication with the mounting hole (120), the middle part of the right side of the rectangular movable block (11) is provided with a threaded hole (110) for the threaded connection of the long bolt (2), the left end of the upper and lower sides of the rectangular insertion tube (10) is provided with a first groove (101), the right end of the upper and lower sides of the rectangular movable block (11) is provided with a second groove (111), the first groove (101) and the second groove (111) arranged oppositely are provided with an anti-drop strip (13), the right side of the rectangular movable block (11) and the positions close to the front and rear ends of the bottom are provided with buckles (113), the positions close to the left side of the bottom of the front and rear sides of the rectangular insertion tube (10) are provided with U-shaped butt joints (102), and the U-shaped butt joints (102) are provided with clamping blocks (103) matched with the buckles (113).

2. The expansion screw with telescoping outer tube of claim 1, wherein: The rectangular insertion tube (10) is located in the right of the rectangular movable block (11), when the rectangular movable block (11) moves towards the rectangular insertion tube (10), the middle part of the anti-drop strip (13) bulges outward.

3. The expansion screw with telescoping outer tube of claim 1, wherein: The positions close to the left and right ends of the outer side of the anti-drop strip (13) are provided with first deformation grooves (130), and the middle part of the inner side of the anti-drop strip (13) is provided with a second deformation groove (131).

4. The expansion screw with telescoping outer tube of claim 1, wherein: The left end of the anti-drop strip (13) is bonded to the left side of the inner wall of the second groove (111), and the right end of the anti-drop strip (13) is bonded to the right side of the inner wall of the first groove (101).

5. The expansion anchor with telescoping outer sleeve of claim 1, wherein: Four anti-rotation plates (14) arranged in a ring array are arranged between the rectangular insertion tube (10) and the circular pressing plate (12).

6. The expansion anchor with telescoping outer sleeve of claim 1, wherein: The positions close to the front and rear ends of the top of the left side of the rectangular insertion tube (10) are provided with positioning rods (15), and the length of the positioning rod (15) is less than the length of the long bolt (2).

7. The expansion screw with telescoping outer tube of claim 6, wherein: The positions close to the front and rear ends of the top of the right side of the rectangular movable block (11) are provided with positioning holes (112), and the two positioning rods (15) pass through the two positioning holes (112) respectively.

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