Double-end single-tip screw and dog leash comprising same

Abstract

The utility model relates to the field of hardware, in particular to a double-end single-tip screw and a dog leash comprising the double-end single-tip screw, the double-end single-tip screw comprises a screw head, a stud and a self-tapping part, the screw head, the stud and the self-tapping part are fixedly connected in sequence, an inner hexagonal groove is formed in the surface of the screw head, and the inner hexagonal groove is connected with the stud. The inner hexagonal groove is matched with a hexagonal drill bit, and after the double-head single-tip screw is locked, the head of the screw is flush with the surface of a workpiece. The dog leash comprising the screw comprises a pulling rope, an injection molding part and a connecting body, the pulling rope is sleeved with the injection molding part, the pulling rope and the injection molding part are fixed through the double-end single-tip screw, and the connecting body is fixed to the tail end of the pulling rope. The double-end single-tip screw is reasonable in structure, firm in locking and attractive, when the double-end single-tip screw is applied to the dog leash, reliable fixing of a traction rope and an injection molding part can be achieved, the structural stability of the dog leash is improved, and the service life of the dog leash is prolonged.

Description

Technical Field

[0001] This application relates to the field of hardware products, and in particular to a double-ended single-pointed screw and a dog leash containing the same. Background Technology

[0002] Screws, as traditional hardware components, are typically used to join two workpieces, serving a connecting and fastening function. In related technologies, traditional screws include nuts and studs, primarily based on the principle of inclined planes. Screws can convert rotational motion into linear motion, distributing force over a longer distance so that a smaller force can overcome greater resistance, thereby achieving the function of fastening and connecting.

[0003] The existing screws have the following problems: the long-term exposure of the nut after installation can easily lead to corrosion and detachment, which in turn affects the safety, durability and operability of the connected workpieces. Summary of the Invention

[0004] To improve the safety, durability, and maneuverability of the connected workpieces, this application provides a double-ended single-pointed screw and a dog leash containing the same.

[0005] The technical solution provided in this application for a double-ended single-pointed screw and a dog leash containing the same is as follows:

[0006] A double-ended single-pointed screw includes: a screw head, a stud, and a self-tapping part, wherein the screw head, the stud, and the self-tapping part are fixedly connected in sequence, and the surface of the screw head has an internal hexagonal groove that is adapted to a hexagonal drill bit. After the double-ended single-pointed screw is locked, the screw head is flush with the surface of the workpiece.

[0007] By adopting the above solution, during the use of the double-ended single-pointed screw in this application, the hexagonal drill bit of the electric drill adheres to the internal hexagonal groove of the screw head. After the double-ended single-pointed screw is locked, the screw head is flush with the surface of the workpiece, which reduces the occurrence of corrosion and detachment caused by the long-term exposure of the nut after the traditional screw installation, and indirectly improves the safety, durability and operability of the connected workpiece.

[0008] Preferably, the groove depth of the internal hexagonal slot is 2-3mm, the center distance between the edges of the internal hexagonal slot is 2mm, and the tolerance range of the internal hexagonal slot is 0 to +0.12mm.

[0009] By adopting the above solution, increasing the stress-bearing surface of the double-headed single-pointed screw, reducing misfitting with the hexagonal drill bit, and maintaining a reasonable tolerance range, manufacturing costs can be reduced and yield improved.

[0010] Preferably, the double-ended single-pointed screw further includes a threaded portion, which includes a fastening thread section and an installation thread section. The fastening thread section is disposed near the outer wall of the screw head, and the installation thread section is disposed on the outer wall of the stud.

[0011] By adopting the above scheme, the installation threaded section provides basic biting force, while the tightening threaded section increases the biting stability of the double-ended single-pointed screw.

[0012] Preferably, the nominal diameter of the fastening threaded section is in the range of 3.83-3.93 mm, and the pitch is in the range of 4-5 mm.

[0013] By adopting the above solution, the preload of the double-ended single-pointed screw is enhanced to maintain static tension, and self-locking is ensured through appropriate pitch design.

[0014] Preferably, the nominal diameter of the mounting thread section is in the range of 4.12-4.22 mm, and the pitch is in the range of 16-17 mm.

[0015] By adopting the above solution, the lead angle of the double-ended single-pointed screw is optimized, the number of rotations is reduced, and it is easier to quickly disassemble and assemble.

[0016] Preferably, the length ratio of the fastening thread section to the mounting thread section is 1:4.

[0017] By adopting the above solution and adjusting the length ratio of the fastening thread section and the installation thread section, it is possible to simultaneously balance the absorption of high-frequency vibration force by the double-ended single-pointed screw and its compatibility with different installation materials.

[0018] Preferably, the self-tapping part is in the shape of a spike.

[0019] By adopting the above scheme, the material penetration of the double-ended single-pointed screw is increased, which plays a guiding role in the thread forming process.

[0020] Preferably, a dog leash includes the aforementioned double-ended single-pointed screw, and further includes a leash, an injection-molded component, and a connector. The injection-molded component is sleeved on the outside of the leash, the leash and the injection-molded component are fixed by the double-ended single-pointed screw, and the connector is fixed to the end of the leash.

[0021] By adopting the above method, the hexagonal drill bit of the electric drill is attached to the internal hexagonal groove of the screw head, vertically aligned with the area where the side of the dog leash injection molded part contacts the leash that passes through the injection molded part, and the electric drill is started to drive in the double-ended single-pointed screw. The double-ended single-pointed screw tightly connects the leash and the injection molded part, thereby improving the safety, durability and maneuverability of the dog leash.

[0022] In summary, this application includes at least one of the following beneficial technical effects:

[0023] 1. Double-ended single-pointed screws are fully recessed into the workpiece after installation, reducing wear caused by exposed screw heads;

[0024] 2. Reduced screw manufacturing costs and improved yield;

[0025] 3. Enhanced the safety, durability, and maneuverability of dog leashes. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a double-headed single-pointed screw according to an embodiment of this application.

[0027] Figure 2 This is a schematic diagram of the overall structure of a dog leash according to an embodiment of this application.

[0028] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the diagram.

[0029] Explanation of reference numerals in the attached drawings: 1. Screw head; 11. Socket hexagonal groove; 2. Stud; 3. Self-tapping part; 4. Threaded part; 41. Fastening threaded section; 42. Mounting threaded section; 51. Traction rope; 52. Injection molded part; 521. Through hole; 53. Connector. Detailed Implementation

[0030] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0031] This application discloses a double-ended single-pointed screw. (Refer to...) Figure 1 The screw includes a screw head 1, a stud 2, and a self-tapping part 3, which are sequentially fixedly connected. The screw head 1, stud 2, and self-tapping part 3 are all integrally formed. The screw head 1 has an internal hexagonal groove 11 on its surface. The internal hexagonal groove 11 is coaxial with the screw head 1, stud 2, and self-tapping part 3. The internal hexagonal groove 11 is compatible with a hexagonal drill bit. After the double-ended single-pointed screw is locked, the screw head 1 is flush with the surface of the workpiece.

[0032] Furthermore, the depth of the internal hexagonal slot 11 ranges from 2 to 3 mm. In this embodiment, the depth of the internal hexagonal slot 11 is specifically 2.5 mm. At the same time, the center distance between the edges of the internal hexagonal slot 11 is 2 mm, and the tolerance range of the internal hexagonal slot is 0 to +0.12 mm. The double-ended single-pointed screw can reduce the ineffective output of force during the transmission process through a larger six-sided contact. It allows for a reasonable tolerance range for the center distance between the edges of the internal hexagonal slot 11, which can reduce the processing steps of key processes and control material loss, thereby reducing manufacturing costs and improving yield.

[0033] On the other hand, the double-ended single-pointed screw also includes a threaded portion 4, which includes a fastening threaded section 41 and an installation threaded section 42. The threads of the fastening threaded section 41 and the installation threaded section 42 have the same direction. The fastening threaded section 41 is located near the outer wall of the screw head 1, and the installation threaded section 42 is located on the outer wall of the stud 2. The fastening threaded section 41 and the screw head 1 are integrally formed, and the installation threaded section 42 and the stud 2 are integrally formed.

[0034] Furthermore, during the process of the double-ended single-pointed screw entering the workpiece, the self-tapping part 3 is responsible for cutting the thread groove, the installation thread section 42 is responsible for providing the basic biting force, and the added fastening thread section 41 improves the biting stability of the double-ended single-pointed screw. The dual-section thread gives the screw higher torque transmission efficiency and better anti-slip performance.

[0035] Specifically, the nominal diameter of the fastening thread section 41 ranges from 3.83 to 3.93 mm, and the pitch ranges from 4 to 5 mm. In this embodiment, the diameter of the fastening thread section 41 is specifically 3.88 mm, and the pitch is specifically 4.5 mm. The M4 thread diameter can reduce the resistance encountered by the screw during the drilling process into the workpiece, while not losing too much of its own structural strength. The precise pitch lead angle is usually less than 3°, forming a similar "sloping self-locking" effect. When the rotational torque is applied, the axial preload can be amplified several times, ensuring the fixing strength and effectively suppressing vibration and loosening.

[0036] Specifically, the nominal diameter of the mounting thread section 42 ranges from 4.12 to 4.22 mm, and the pitch ranges from 16 to 17 mm. In this embodiment, the diameter of the mounting thread section 42 is specifically 4.17 mm, and the pitch is specifically 16.5 mm. The corresponding lead angle is calculated to be 29.5°. The increase in single-turn feed means that fewer rotations are required for the same drilling depth, which facilitates the quick installation and removal of the double-ended single-pointed screw.

[0037] Furthermore, the length ratio of the fastening thread section 41 to the mounting thread section 42 is 1:4. 25% of the pitch is used to increase the effective number of meshing teeth, and 75% of the pitch is used to disperse the initial assembly stress, which can balance the absorption of high-frequency vibration force by the double-ended single-pointed screw and its compatibility with different mounting materials.

[0038] In addition, the self-tapping part 3 is spike-shaped, which increases the initial cutting pressure by reducing the contact area of ​​the self-tapping part 3. The sharp conical structure also makes it easier to drill into the workpiece, ensuring that the double-headed single-pointed screw enters the workpiece from the workpiece surface in the vertical direction for fixing.

[0039] On the other hand, this application discloses a dog leash, referring to... Figure 2 and Figure 3The device includes a double-headed single-pointed screw as described above, as well as a traction rope 51, an injection molded part 52, and a connector 53. The injection molded part 52 is sleeved on the outside of the traction rope 51. The injection molded part 52 has through holes 521 at both the top and bottom. There are two through holes 521 at the top and one through hole 521 at the bottom. The through hole 521 at the bottom is connected to one of the through holes 521 at the top. The traction rope 51 passes through the injection molded part 52 from bottom to top through the through hole 521 at the bottom, and then one end of the traction rope 51 is finally placed inside the injection molded part 52 through the other through hole 521 at the top.

[0040] Furthermore, the leash 51 and the injection-molded part 52 are fixed by a double-ended single-pointed screw. The connector 53 is fixed to the end of the leash 51. The connector 53 is adapted to the size of the pet and is used to sling the pet. The double-ended single-pointed screw is driven into the channel between the two through holes 521 inside the injection-molded part 52 by an electric drill bit, and passes through both the injection-molded part 52 and the leash 51, thereby tightly connecting the leash 51 and the injection-molded part 52. While making the dog leash lightweight and reducing the burden, the safety, durability and controllability of the dog leash are ensured.

[0041] The implementation principle of a double-ended single-pointed screw in this application embodiment is as follows: the internal hexagonal groove 11 of the double-ended single-pointed screw is clamped onto the hexagonal drill bit of the electric drill, the electric drill is vertically aligned with the workpiece to be connected, and the double-ended single-pointed screw is driven in. There is no need to pre-drill holes. During the high-speed rotation of the double-ended single-pointed screw, a thread groove adapted to its two different threads is directly cut into the inside of the workpiece, thereby tightly fixing the two workpieces together and improving the safety, durability and operability of the connected workpieces.

[0042] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A double-ended single-pointed screw, characterized in that, The screw includes a screw head (1), a stud (2), and a self-tapping part (3). The screw head (1), the stud (2), and the self-tapping part (3) are fixedly connected in sequence. The screw head (1) has an internal hexagonal groove (11) on its surface. The internal hexagonal groove (11) is compatible with a hexagonal drill bit. After the double-ended single-point screw is locked, the screw head (1) is flush with the surface of the workpiece.

2. The double-ended single-pointed screw according to claim 1, characterized in that, The groove depth of the internal hexagonal slot (11) is 2-3mm, the center distance of the internal hexagonal slot (11) is 2mm, and the tolerance range of the internal hexagonal slot is 0 to +0.12mm.

3. A double-ended single-pointed screw according to claim 1, characterized in that, It also includes a threaded portion (4), which includes a fastening thread section (41) and an installation thread section (42). The fastening thread section (41) is located near the outer wall of the screw head (1), and the installation thread section (42) is located on the outer wall of the stud (2).

4. A double-ended single-pointed screw according to claim 3, characterized in that, The nominal diameter of the fastening thread section (41) ranges from 3.83 to 3.93 mm, and the pitch ranges from 4 to 5 mm.

5. A double-ended single-pointed screw according to claim 3, characterized in that, The nominal diameter of the mounting thread section (42) ranges from 4.12 to 4.22 mm, and the pitch ranges from 16 to 17 mm.

6. A double-ended single-pointed screw according to claim 3, characterized in that, The length ratio of the fastening thread section (41) to the mounting thread section (42) is 1:

4.

7. A double-ended single-pointed screw according to claim 1, characterized in that, The self-tapping part (3) is in the shape of a spike.

8. A dog leash, comprising a double-ended single-pointed screw as described in any one of claims 1-7, characterized in that, It also includes a traction rope (51), an injection molded part (52), and a connector (53). The injection molded part (52) is sleeved on the outside of the traction rope (51). The traction rope (51) and the injection molded part (52) are fixed by the double-headed single-pointed screw. The connector (53) is fixed to the end of the traction rope (51).

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