Double-clamping type plastic expansion screw
By designing a double-screw structure on the plastic expansion tube of the plastic expansion screw, including the expansion part at the front and rear ends, and using the second expansion part formed by the U-shaped hole, the problem of insufficient pulling force of the existing plastic expansion screw is solved, and the fixing firmness of the screw is significantly improved.
Patent Information
- Application Number
- CN202422545876.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-22
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-10-22
AI Technical Summary
The existing plastic expansion screws adopt a single expansion structure and have poor tension resistance when fixed to the wall and are easily loosened.
A double-screw plastic expansion screw is designed. The front end and rear end of the plastic expansion tube are provided with an expansion part. The expansion structure at the rear end includes a second expansion part, which is formed through a U-shaped hole. When the metal screw is screwed in, the first expansion part and the second expansion part are both expanded to the outside.
The pulling force that plastic expansion screws can withstand on the wall greatly improves the possibility of loosening.
Smart Images
Figure CN222991880U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of plastic expansion screws, and particularly relates to a double-card plastic expansion screw. Background Art
[0002] Plastic expansion screws have the characteristics of simple operation and firm installation, and are widely used for the connection and installation of various items on walls or other wall surfaces. The existing plastic expansion screws usually adopt a structure composed of a metal screw and a plastic expansion tube. During installation, a hole is first drilled in the wall, then the plastic expansion tube is placed in, and then the metal screw is screwed in. By continuously screwing in the metal screw, the front end of the plastic expansion tube is expanded to achieve the purpose of fixing the item on the wall.
[0003] However, due to the single expansion structure of the existing plastic expansion screws, the anti-pull-out force is poor when fixed on the wall, and it is very easy to loosen during use. Summary of the Invention
[0004] The utility model provides a double-card plastic expansion screw aiming at the problems existing in the prior art, aiming to overcome the defect that the existing plastic expansion screws are easy to fall off.
[0005] The utility model is realized as follows:
[0006] A double-card plastic expansion screw includes a metal screw and a plastic expansion tube. The front end of the plastic expansion tube has a first expansion part. It is characterized in that an expansion structure is provided at the rear end of the plastic expansion tube, and the expansion structure includes a second expansion part, so that when the metal screw is screwed into the plastic expansion tube, both the first expansion part and the second expansion part expand outward.
[0007] The expansion structure includes at least a pair of U-shaped holes on the wall of the rear end of the plastic expansion tube to form the second expansion part. A protrusion is provided on the outside of the second expansion part, and its inner side is flush with the inner wall of the rear end of the plastic expansion tube, so that when the plastic expansion tube is inserted into the fixing hole of the outer wall, the second expansion part deforms inward, and when the metal screw is screwed into the plastic expansion tube, the second expansion part expands outward.
[0008] The U-shaped hole is a positive U-shaped or an inverted U-shaped.
[0009] The protrusion includes a pointed end and a guiding part. The lower end of the second expansion part is flush with the outer wall of the upper end of the plastic expansion tube, and the guiding part extends obliquely outward from bottom to top to the pointed end.
[0010] The rear end of the plastic expansion tube has a disc.
[0011] The expansion structure includes a square hole on the plastic expansion tube and a metal expansion tube installed inside the plastic expansion tube. The second expansion part is located on the metal expansion tube and corresponds to the position of the square hole.
[0012] The metal expansion tube has a U-shaped hole to form the second expansion part, and the middle part of the second expansion part bulges inward or outward.
[0013] The radial cross-section of the metal expansion tube is C-shaped or an open circular ring shape.
[0014] The longitudinal cross-section of the second expansion part is in a zigzag shape.
[0015] The metal screw includes a nut and an insertion part. An inner expansion part is provided at the upper part of the insertion part, and a threaded part is provided at the lower part. The diameter of the inner expansion part is larger than the diameter of the threaded part.
[0016] Alternatively, the metal screw includes a nut and an insertion part, and an inner expansion tube is sleeved on the upper part of the insertion part.
[0017] The utility model has the following beneficial effects:
[0018] (1) By providing expansion parts at both the front end and the rear end of the plastic expansion tube, and at the same time providing protrusions on the outer sides of the first expansion part and the second expansion part, when the plastic expansion tube is placed into the fixing hole in the wall, it contracts inward, and when the metal screw is screwed in, both the first expansion part and the second expansion part expand outward, greatly improving the pulling force that the plastic expansion screw can withstand when fixed on the wall.
[0019] (2) By providing a U-shaped hole corresponding to the position of the square hole on the wall of the metal expansion tube installed inside the plastic expansion tube to form the second expansion part, when the metal screw is screwed into the metal expansion tube and the plastic expansion tube, the first expansion part and the second expansion part expand outward, greatly improving the pulling force that the plastic expansion screw can withstand when fixed on the wall. Description of the Drawings
[0020] Figure 1 It is a schematic structural diagram of the plastic expansion tube of the first embodiment from the first angle;
[0021] Figure 2 It is a schematic structural diagram of the plastic expansion tube of the first embodiment from the second angle;
[0022] Figure 3 It is a partial structural cross-sectional view of the plastic expansion tube of the first embodiment;
[0023] Figure 4 It is a cross-sectional structural schematic diagram after the plastic expansion tube of the first embodiment is inserted into the wall;
[0024] Figure 5Schematic cross-sectional structure diagram after installation of the plastic expansion screw in Embodiment 1;
[0025] Figure 6 Schematic structure diagram of the metal screw in Embodiment 2;
[0026] Figure 7 Schematic structure diagram of the metal screw in Embodiment 3;
[0027] Figure 8 Schematic structure diagram of the plastic expansion tube in Embodiment 4;
[0028] Figure 9 Schematic structure diagram of the plastic expansion tube in Embodiment 5;
[0029] Figure 10 Schematic structure diagram of the plastic expansion tube at the first angle in Embodiment 6;
[0030] Figure 11 Schematic structure diagram of the plastic expansion tube at the second angle in Embodiment 6;
[0031] Figure 12 Schematic cross-sectional structure diagram of the cooperation between the plastic expansion tube and the metal expansion tube in Embodiment 7;
[0032] Figure 13 Schematic structure diagram of the plastic expansion tube in Embodiment 7;
[0033] Figure 14 Schematic structure diagram of the metal expansion tube in Embodiment 7;
[0034] Figure 15 Partial structure cross-sectional view after assembly of the plastic expansion screw in Embodiment 7;
[0035] Figure 16 Schematic structure diagram of the metal expansion tube in Embodiment 8.
[0036] Explanation of the reference numerals in the drawings: 100, plastic expansion tube; 110, first expansion part; 120, second expansion part; 121, U-shaped hole; 122, pointed end part; 123, guiding part; 130, disc; 140, metal expansion tube; 150, square hole; 200, metal screw; 210, nut; 220, inserted part; 221, inner expansion part; 222, threaded part; 230, inner expansion tube; 300, wall body. Detailed implementation manners
[0037] The following will further elaborate on the specific implementation manners of the present utility model in conjunction with the accompanying drawings of the embodiments, so that the technical solutions of the present utility model are easier to understand and master. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.
[0038] Embodiment 1
[0039] This embodiment provides a plastic expansion screw, as Figures 1-5 shown, which includes a metal screw 200 and a plastic expansion tube 100. The front end of the plastic expansion tube 100 has a first expansion portion 110, and the rear end of the plastic expansion tube 100 is provided with an expansion structure. The expansion structure includes a second expansion portion 120, so that when the metal screw is screwed into the plastic expansion tube 100, both the first expansion portion 110 and the second expansion portion 120 expand outward. Referring to Figure 2 the perspective, the lower end of the plastic expansion tube 100 is the front end, and the upper end is the rear end. The front end of the plastic expansion tube 100 has a slot to form the first expansion portion 110.
[0040] As Figures 1-3 shown, the expansion structure includes at least a pair of U-shaped holes 121 on the rear end wall of the plastic expansion tube 100 to form the second expansion portion 120. A protrusion is provided on the outside of the second expansion portion 120, and its inner side is flush with the inner wall of the rear end of the plastic expansion tube 100, so that when the plastic expansion tube 100 is inserted into the fixing hole in the outer wall, the second expansion portion 120 deforms inward, and when the metal screw 200 is screwed into the plastic expansion tube 100, the second expansion portion 120 expands outward. In this embodiment, there is a pair of U-shaped holes 121, and the U-shaped holes 121 are regular U-shaped. In other alternative embodiments, the number of U-shaped holes 121 can also be more than one pair. When two pairs of U-shaped holes 121 are provided, the orientations of each pair of U-shaped holes 121 can also be different. For example, the lowermost U-shaped hole 121 is regular U-shaped, and the others are inverted U-shaped; or the lowermost U-shaped hole 121 is inverted U-shaped, and the others are regular U-shaped.
[0041] As Figure 3 shown, in order to fix the second expansion portion 120 more firmly on the wall 300, the protrusion includes a pointed end portion 122 and a guiding portion 123. The lower end of the second expansion portion 120 is flush with the outer wall of the upper end of the plastic expansion tube 100, and the guiding portion 123 extends obliquely outward from bottom to top to the pointed end portion 122. The guiding portion 123 can ensure that when the plastic expansion tube 100 is inserted into the wall 300, the second expansion portion 120 can smoothly deform and contract inward. After the metal screw 200 is screwed into the plastic expansion tube 100, the metal screw 200 squeezes the second expansion portion 120 to make the second expansion portion 120 deform outward, forming an extrusion with the wall 300, and the pointed end portion 122 can partially embed into the wall 300, so that the plastic expansion screw can be firmly fixed on the wall 300.
[0042] The second expansion part 120 of this embodiment is integrally formed on the plastic expansion tube 100, and the inner wall of the second expansion part 120 is flush with the inner wall of the plastic expansion tube 100, which is convenient for the injection molding of the plastic expansion tube 100.
[0043] Embodiment 2
[0044] The metal screw 200 in Embodiment 1 includes a nut 210 and an insertion part 220. Except for the lower end having a sharp angle, other parts of the insertion part 220 have equal-diameter threads. As Figure 6 shown, the metal screw 200 of this embodiment includes a nut 210 and an insertion part 220. An inner expansion part 221 is provided on the upper part of the insertion part 220, and a threaded part 222 is provided on the lower part. The diameter of the inner expansion part 221 is larger than the diameter of the threaded part 222, which is beneficial for the second expansion part 120 to expand more fully outward and improve the firmness of the plastic expansion screw fixation.
[0045] Other structures of this embodiment are the same as those of Embodiment 1.
[0046] Embodiment 3
[0047] Based on Embodiment 1, an inner expansion tube 230 is sleeved on the upper part of the insertion part 220 of the metal screw 200 in this embodiment of the metal screw 200. As Figure 7 shown, this is beneficial for the second expansion part 120 to expand more fully outward and improve the firmness of the plastic expansion screw fixation.
[0048] Other structures of this embodiment are the same as those of Embodiment 1.
[0049] Embodiment 4
[0050] When the plastic expansion screw is used for frontally fixing the insulation board, as Figure 8 shown, the rear end of the plastic expansion tube 100 has a disc 130, and the disc 130 is integrally formed on the plastic expansion tube 100. In other alternative embodiments, the disc 130 can also be assembled separately from the plastic expansion tube 100.
[0051] Other structures of this embodiment are the same as those of Embodiment 1.
[0052] Embodiment 5
[0053] The expansion directions of the first expansion part 110 and the second expansion part 120 in Embodiment 1 are perpendicular to each other. As Figure 9 shown, the expansion directions of the first expansion part 110 and the second expansion part 120 in this embodiment are the same.
[0054] Other structures of this embodiment are the same as those of Embodiment 1.
[0055] Embodiment 6
[0056] The U-shaped hole 121 in the first embodiment is a regular U-shape. As Figures 10-11 shown, the U-shaped hole 121 in this embodiment is an inverted U-shape. After the second expansion part 120 expands outward, it can form a barbed structure, which can improve the fixing firmness of the plastic expansion screw.
[0057] Other structures in this embodiment are the same as those in the first embodiment.
[0058] Embodiment Seven
[0059] The second expansion part 120 in the sixth embodiment is integrally formed on the plastic expansion tube 100. In this embodiment, a metal expansion tube 140 is additionally provided on the basis of the plastic expansion tube 100, and the second expansion part 120 is arranged on the metal expansion tube 140. Specifically, as Figures 12-15 shown, the expansion structure includes a square hole 150 on the plastic expansion tube 100 and a metal expansion tube 140 installed in the plastic expansion tube 100. The second expansion part 120 is located on the metal expansion tube 140 and corresponds to the position of the square hole 150. The metal expansion tube 140 has a U-shaped hole 121 to form the second expansion part 120, and the middle part of the second expansion part 120 bulges inward.
[0060] The inner diameter of the metal expansion tube 140 is greater than or equal to the outer diameter of the insertion part 220 of the metal screw 200. When the metal screw 200 is screwed into the plastic expansion tube 100, it can squeeze the second expansion part 120 to expand outward. In order to better fix the metal expansion part on the fixing hole of the wall 300, the upper end of the metal expansion part protrudes from the metal tube body of the metal expansion tube 140, and the longitudinal section of the metal expansion tube 140 is in a broken line shape.
[0061] The radial section of the metal expansion tube 140 is in a circular ring shape with an opening. In other alternative embodiments, the radial section of the metal expansion tube 140 can also be C-shaped. This is convenient for the metal expansion tube 140 to be formed by bending a metal sheet.
[0062] In this embodiment, the metal expansion tube 140 can be installed in the rear end part of the plastic expansion tube 100 at the factory. When installing the plastic expansion screw, first drill a hole in the wall, then install the plastic expansion tube 100 in the hole. At this time, the metal expansion part contracts inward, and then the metal screw 200 is sequentially screwed into the metal expansion tube 140 and the front end part of the plastic expansion tube 100. At this time, both the first expansion part 110 and the second expansion part 120 expand outward, making the plastic expansion screw firmly fixed on the wall 300.
[0063] Embodiment Eight
[0064] The middle part of the second expansion part 120 in the seventh embodiment bulges inward, as Figure 16As shown, the middle part of the second expansion part 120 of this embodiment bulges outward. When the plastic expansion tube 100 is inserted into the wall body 300, the wall body 300 will squeeze the second expansion part 120 to deform inward. After the metal screw 200 is screwed in, the second expansion part 120 expands outward again to form a firm connection with the wall body 300.
[0065] The above is only the specific implementation manner of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the content described in the drawings and the above specific implementation manner. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.
Claims
1. A double-clip plastic expansion screw, comprising a metal screw (200) and a plastic expansion tube (100), wherein the front end of the plastic expansion tube (100) has a first expansion portion (110), characterized in that: The rear end of the plastic expansion tube (100) is provided with an expansion structure, and the expansion structure includes a second expansion part (120), so that when the metal screw is screwed into the plastic expansion tube (100), the first expansion part (110) and the second expansion part (120) both expand outward.
2. A double-clip plastic expansion screw according to claim 1, characterized in that: The expansion structure comprises at least one pair of U-shaped holes (121) located on the tube wall of the rear end portion of the plastic expansion tube (100) to form the second expansion portion (120); a protrusion is provided on the outer side of the second expansion portion (120); the inner side of the protrusion is flush with the inner wall of the rear end portion of the plastic expansion tube (100), so that when the plastic expansion tube (100) is inserted into the fixing hole of the outer wall, the second expansion portion (120) is deformed inwardly; when the metal screw (200) is screwed into the plastic expansion tube (100), the second expansion portion (120) expands outwardly.
3. A double-clip plastic expansion screw according to claim 2, characterized in that: The U-shaped hole (121) is a positive U-shape or an inverted U-shape.
4. A double-card plastic expansion screw according to claim 2, characterized in that: The protrusion comprises a tip portion (122) and a guide portion (123); the lower end of the second expansion portion (120) is flush with the outer wall of the upper end of the plastic expansion tube (100); and the guide portion (123) extends outwardly from bottom to top to the tip portion (122).
5. The double-clip plastic expansion screw according to claim 1, characterized in that: The rear end of the plastic expansion pipe (100) is provided with a disc (130).
6. The double-clip plastic expansion screw according to claim 1, characterized in that: The expansion structure comprises a square hole (150) located on the plastic expansion tube (100) and a metal expansion tube (140) installed in the plastic expansion tube (100); the second expansion portion (120) is located on the metal expansion tube (140) and corresponds to the position of the square hole (150).
7. The double-clip plastic expansion screw according to claim 6, characterized in that: The metal expansion tube (140) has a U-shaped hole (121) to form the second expansion portion (120), and the middle portion of the second expansion portion (120) protrudes inwardly or outwardly.
8. The double-clip plastic expansion screw according to claim 6, characterized in that: The radial cross section of the metal expansion tube (140) is C-shaped or an open circular ring.
9. The double-clip plastic expansion screw according to claim 6, characterized in that: The longitudinal cross section of the second expansion portion (120) is in a broken line shape.
10. A double-clip plastic expansion screw according to any one of claims 1 to 9, characterized in that: The metal screw (200) comprises a nut (210) and an inserting portion (220); the upper portion of the inserting portion (220) is provided with an inner expansion portion (221), and the lower portion is provided with a threaded portion (222); the diameter of the inner expansion portion (221) is greater than the diameter of the threaded portion (222); Alternatively, the metal screw (200) comprises a nut (210) and an inserting portion (220), and an inner expansion tube (230) is sleeved on the upper portion of the inserting portion (220).