Combined fastener

Abstract

The utility model discloses a combined fastener which comprises a sunk screw and a pull ring screw. The countersunk head screw comprises a countersunk head screw cap and a self-tapping drill tail, an inner threaded hole is formed in the top end face of the countersunk head screw cap and extends towards the bottom end of the countersunk head screw cap, a hexagonal screwing groove is formed in the bottom of the inner threaded hole, the self-tapping drill tail is arranged at the bottom end of the self-tapping drill tail, and the self-tapping drill tail is connected to the bottom end of the self-tapping drill tail. The self-drilling screw rod is drilled into an object through the hexagonal screwing groove, so that the countersunk head screw cap is completely immersed into the object, and fastening and embedding of the countersunk head screw and the object are achieved. The pull ring screw comprises a pull ring part and a connecting screw cap, a connecting screw rod matched with the inner threaded hole is arranged at the bottom end of the connecting screw cap, and the pull ring screw is locked into the inner threaded hole through the connecting screw rod, so that the pull ring screw is detachably fixed with the countersunk head screw cap, and a lifting structure is provided for a flat object surface; after the object is moved, the pull ring screw can be reversely screwed to be detached from the sunk screw, so that the surface of the object recovers to be flat, and detaching is convenient.

Description

Technical Field

[0001] This utility model relates to the field of fastener technology, and in particular to a combination fastener. Background Technology

[0002] Countersunk screws are a common type of fastener. Conventional screws are inserted into pre-drilled holes on the surface of an object, with the screw head protruding above the surface. The size of the pre-drilled hole matches the thread of the screw. However, when a countersunk screw is installed into a pre-drilled hole, the head sinks down to be flush with the surface of the object, forming a countersunk hole structure that keeps the surface of the object flat and makes the overall surface of the object look neat.

[0003] However, the flat surface of objects mounted with countersunk screws often lacks gripping structures. When moving an object, such as pulling it out from a narrow space, the countersunk screw's deep embedding and secure connection can be utilized to attach a detachable pull-out mechanism. After use, removing the pull-out mechanism restores the object's flat surface. Current technology lacks such a solution and needs improvement to fill this gap. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a combined fastener to solve the above problems.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a combined fastener, comprising a countersunk screw and a pull ring screw. The countersunk screw includes a countersunk head and a self-drilling shank. The top surface of the countersunk head has an internally threaded hole extending towards the bottom end of the countersunk head. The bottom of the internally threaded hole has a hexagonal groove. The self-drilling shank is connected to the bottom end of the countersunk head, and its bottom end has a self-tapping drill bit. The pull ring screw includes a pull ring portion and a connecting head. The pull ring portion is an annular structure located at the top of the connecting head. The bottom end of the connecting head has a connecting shank that engages with the internally threaded hole. The pull ring screw is locked into the internally threaded hole via the connecting shank, allowing the pull ring screw to be detachably connected and fixed to the countersunk head.

[0007] Preferably, the connecting nail head is frustum-shaped, the pull ring is a welded part on the circumference of the top surface of the connecting nail head, and the two ends of the pull ring are symmetrically arranged with respect to the center of the top surface of the connecting nail head.

[0008] Preferably, a straight groove is also provided at the bottom of the hexagonal groove.

[0009] Preferably, the connecting cap has an inverted conical structure, and the area of ​​the connecting cap gradually decreases along the direction toward the drill tail screw.

[0010] Preferably, the radial length of the bottom end face of the connecting nail head is greater than the radial length of the top end face of the countersunk nail head.

[0011] Preferably, the drill shank screw is fitted with an elastic ring at the junction with the countersunk head.

[0012] Preferably, the surface of the internal threaded hole of the countersunk head is provided with a zinc plating layer.

[0013] The main technical effects achieved by this utility model are as follows:

[0014] The aforementioned fastener has an internally threaded hole on the countersunk head of the countersunk screw. A hexagonal groove is provided at the bottom of the internally threaded hole for the tool to drive the countersunk screw. The pull ring screw is detachably connected to the countersunk screw by locking its connecting screw into the internally threaded hole. This provides a detachable lifting structure for flat object surfaces. After the object has been moved and the surface needs to be restored to flatness, the pull ring screw can be unscrewed in the reverse direction to remove it from the countersunk screw. It can be reinstalled when the object needs to be moved again, making it convenient to use.

[0015] The countersunk screw's self-drilling shank can quickly drill through the surface of an object, and the countersunk screw can be deeply embedded in the object to achieve a stable connection with it. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the combined fastener provided in this embodiment of the utility model;

[0017] Figure 2 This is a structural exploded view of the combined fastener;

[0018] Figure 3 A cross-sectional view of the countersunk screw in the combined fastener;

[0019] Figure 4 This is a top view of the countersunk screw.

[0020] The reference numerals in the above figures are as follows:

[0021] Countersunk screw 1, internal threaded hole 101, hexagonal slot 102, slotted slot 103, countersunk head 11, self-drilling screw 12, self-tapping drill 121;

[0022] 2. Pull ring screw, 21. Pull ring part, 22. Connecting nail head, 23. Connecting screw. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Examples of these preferred embodiments are illustrated in the drawings. The embodiments of this utility model shown in and described with reference to the drawings are merely exemplary, and this utility model is not limited to these embodiments.

[0024] It should also be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and / or processing steps closely related to the solution according to the present invention are shown in the accompanying drawings, while other details that are not closely related are omitted.

[0025] Reference Figure 1 and Figure 2 As shown, this utility model embodiment provides a combined fastener, which includes a countersunk screw 1 and a pull ring screw 2.

[0026] The countersunk screw 1 includes a countersunk head 11 and a self-drilling screw 12. An internal threaded hole 101 is formed on the top surface of the countersunk head 11, extending towards the bottom end of the countersunk head 11. Figure 3 and Figure 4 As shown, where Figure 3 The diagram shows a cross-sectional view along the radial direction of the top surface of the countersunk head 11. The bottom of the internal threaded hole 101 is provided with a hexagonal groove 102. The self-drilling screw 12 is connected to the bottom end of the countersunk head 11. The bottom end of the self-drilling screw 12 is provided with a self-tapping drill bit 121. The hexagonal groove 102 extends toward the self-drilling screw 12.

[0027] The pull ring screw 2 includes a pull ring portion 21 and a connecting nut 22. The pull ring portion 21 is a ring-shaped structure set at the top of the connecting nut 22. The bottom end of the connecting nut 22 is provided with a connecting screw 23 that fits into the internal threaded hole 101. The pull ring screw 2 is locked into the internal threaded hole 101 through the connecting screw 23, so that the pull ring screw 2 is detachably connected and fixed to the countersunk nut 11 end to end.

[0028] Based on the above-mentioned combined fastener, an internal threaded hole 101 is opened on the countersunk head 11 of the countersunk screw 1. A hexagonal groove 102 is opened at the bottom of the internal threaded hole 101 for the tool to drive the countersunk screw 1. The drill shank 12 of the countersunk screw 1 can quickly drill through the surface of the object. The countersunk screw 1 can be deeply embedded in the object to obtain a stable connection with the object. The pull ring screw 2 is locked into the internal threaded hole 101 through its connecting screw 23 to achieve a detachable connection to the countersunk screw 1. It provides a detachable lifting structure for the flat surface of the object. After the object is moved, if the surface of the object needs to be restored to flatness, the pull ring screw 2 can be turned in the opposite direction to remove it from the countersunk screw 11. It can be reinstalled when the object needs to be moved again, which is convenient to use.

[0029] The workflow of using the combined fastener is as follows: Align the self-tapping drill bit 121 of the countersunk screw 1 with the designated installation position on the surface of the object where the pull-out structure needs to be set. Use a driving tool such as an electric screwdriver adapted to the hexagonal screwdriver 102 to insert into the internal threaded hole 101 and drive the drill bit 12 to drill into the object. When the countersunk head 11 is completely submerged in the object, the countersunk screw 1 is fastened and fitted to the object. Remove the driving tool from the internal threaded hole 101 and insert the connecting screw 23 of the pull ring screw 2 into the internal threaded hole 101. Tighten the pull ring part 21 to lock the pull ring screw 2 onto the countersunk head 11 and fix it. The object can then be pulled by hand by reaching into the pull ring part 21. After the object has been moved, reverse the rotation of the pull ring part 21 to remove the pull ring screw 2 from the countersunk head 11, leaving only the countersunk screw 1 on the object and restoring the flatness of the object surface.

[0030] In this embodiment, the connecting nut 22 is frustum-shaped, and the pull ring 21 is a welded part on the circumference of the top surface of the connecting nut 22. The fixing method of the connecting nut 22 and the connecting screw 23 can refer to the general connection and fixing of the screw head and the screw. The two ends of the pull ring 21 are symmetrically arranged with respect to the center of the top surface of the connecting nut 22, so that the structure of the pull ring 21 is balanced, the welding with the connecting nut 22 is more stable, and it can withstand high applied force.

[0031] Furthermore, a flat slot 103 is also provided at the bottom of the hexagonal slot 102, so that the operator can choose a flathead screwdriver to turn the countersunk screw 1, which makes it convenient for the operator to choose the appropriate tool according to the needs of the scene. The flat slot 103 and the hexagonal slot 102 serve as backup slots for one of them.

[0032] Specifically, the connecting cap 22 has an inverted conical structure, and its area gradually decreases along the direction towards the drill stub 12. Compared to a flat-head structure, the inverted conical structure of the connecting cap 22 is less prone to loosening under vibration or impact loads. When drilling into an object, the gradually expanding contact surface disperses the load over a larger area, reducing local stress concentration. In hard materials, the inverted conical structure can cut synchronously with the drill stub 12 through a pre-drilled hole, forming a self-locking effect and improving shear resistance.

[0033] Furthermore, the radial length of the bottom end face of the connecting rivet 22 is greater than the radial length of the top end face of the countersunk rivet 11. This allows the connecting rivet 22 to completely cover the countersunk rivet 11, thus concealing the connection structure between the two when the pull ring screw 2 is connected to the countersunk screw 1, providing protection.

[0034] There are no threads at the junction of the sprue screw 12 and the countersunk head 11. In this embodiment, the sprue screw 12 is fitted with an elastic ring at the junction with the countersunk head 11, which serves to fasten the sprue screw 12 to the object.

[0035] External environmental factors such as oxygen and water can corrode the internal threaded hole 101 of the countersunk head 11, which is difficult to remove. To extend the service life of the combined fastener, a galvanized layer is provided on the surface of the internal threaded hole 101 of the countersunk head 11. Of course, other structures of the countersunk screw 1 and the pull ring screw 2 can also be provided with a galvanized layer to provide comprehensive protection.

[0036] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0037] The above description is only a specific embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A combination fastener, characterized in that, It includes: A countersunk screw (1) includes a countersunk head (11) and a self-tapping screw (12). The countersunk head (11) has an internal threaded hole (101) on its top surface, which extends toward the bottom of the countersunk head (11). The bottom of the internal threaded hole (101) has a hexagonal groove (102). The self-tapping screw (12) is connected to the bottom of the countersunk head (11) and has a self-tapping drill bit (121) at its bottom. A pull ring screw (2) includes a pull ring portion (21) and a connecting head (22). The pull ring portion (21) is a ring-shaped structure set at the top of the connecting head (22). The bottom end of the connecting head (22) is provided with a connecting screw (23) that fits into the internal threaded hole (101). The pull ring screw (2) is locked into the internal threaded hole (101) through the connecting screw (23), so that the pull ring screw (2) is detachably connected and fixed to the countersunk head (11).

2. The combined fastener according to claim 1, characterized in that, The connecting nail head (22) is frustum shaped, and the pull ring part (21) is a welded part on the circumference of the top surface of the connecting nail head (22). The two ends of the pull ring part (21) are symmetrically arranged with respect to the center of the top surface of the connecting nail head (22).

3. The combined fastener according to claim 1, characterized in that, The bottom of the hexagonal groove (102) is also provided with a straight groove (103).

4. The combined fastener according to claim 2, characterized in that, The connecting cap (22) has an inverted conical structure, and its area gradually decreases along the direction toward the drill screw (12).

5. The combined fastener according to claim 4, characterized in that, The radial length of the bottom end face of the connecting nail head (22) is greater than the radial length of the top end face of the countersunk nail head (11).

6. The combined fastener according to claim 1, characterized in that, The drill stub (12) is fitted with an elastic ring at the junction with the countersunk head (11).

7. The combined fastener according to claim 1, characterized in that, The surface of the internal threaded hole (101) of the countersunk nail head (11) is provided with a galvanized layer.

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