Javelin formed through three-dimensional printing

Abstract

The invention relates to the technical field of sports equipment tools, in particular to a javelin. The javelin formed through 3D printing comprises a javelin barrel and a javelin head which are formed through a 3D printing process, a grip is arranged in the middle of the javelin barrel, the javelin barrel is movably connected with one end of the javelin head through a threaded rod, an internal thread is arranged in one end of the javelin head and connected with an external thread of the threaded rod, a cavity is formed in the javelin head, and a vibration device is arranged in the cavity. The gun barrel and the gun head are uniform in thickness, have no shaking phenomenon, can fly farther, and can be pulled out easily and quickly after being thrown and inserted into the ground.

Description

Technical Field

[0001] The present invention relates to the technical field of sports equipment, in particular to a javelin. Background Art

[0002] 3D printing (3DP) is a rapid prototyping technology. It is a technology that uses digital model files as the basis, uses powdered metal or plastic and other bondable materials to construct objects by printing layer by layer. 3D printing is usually achieved using a digital technology material printer. It is often used to make models in the fields of mold manufacturing and industrial design, and then gradually used for the direct manufacturing of some products. It has applications in footwear, industrial design, architecture, engineering and construction (AEC), automobiles, aerospace, dental and medical industries, education, geographic information systems, civil engineering, firearms and other fields.

[0003] As a kind of sports equipment, javelin is mainly used for spear throwing. The javelin in the prior art mainly consists of a gun shaft, a gun head and a grip, and the gun shaft and the gun head are hollow structures. However, the javelin made by the prior art has problems such as uneven thickness and uneven taper, which will increase the resonance jitter effect during flight. In addition, after throwing, due to the large inertia, it takes a lot of force to pull out the javelin after it is inserted into the ground. Summary of the invention

[0004] In order to solve the above problems, the present invention adopts 3D printing technology to produce javelins, so that the thickness of the javelin is uniform, the jitter is reduced, and the flying distance is longer. A vibration device is also arranged in the gun head. After the javelin is thrown and inserted into the ground, the surrounding soil is loosened by using the vibration device in the gun head, which makes it easier to pull out the javelin.

[0005] To achieve the above-mentioned purpose of the invention, the present invention provides a 3D-printed javelin, including a gun barrel and a gun head formed by a 3D printing process, a grip is provided in the middle of the gun barrel, the gun barrel and one end of the gun head are movably connected by a threaded rod, an internal thread is provided at one end of the gun head to be connected with an external thread on the threaded rod, a cavity is provided in the gun head, and a vibration device is provided in the cavity.

[0006] According to a preferred technical solution, the handle is provided with an inner cavity, the inner cavity is provided with a capsule for containing liquid material, at least one sphere is placed in the capsule, and the bottom of the capsule and the bottom wall of the inner cavity are provided with Velcro for quick fixing and disassembly.

[0007] According to a preferred technical solution, the vibration device includes a vibration motor fixed to the side wall via a bracket, and the vibration motor and a switch are electrically connected to the battery in the battery compartment via wires.

[0008] According to a preferred technical solution, an eccentric wheel is provided on the transmission shaft of the vibration motor, and the eccentricity of the eccentric wheel is a structure in which the eccentricity gradually increases from the inside to the outside.

[0009] According to a preferred technical solution, the transmission shaft of the vibration motor passes through the bottom plate, the rotating disk and the horizontal axis and is fixedly connected to the bottom of the rectangular frame, and a sliding block is provided in the rectangular frame.

[0010] According to a preferred technical solution, the slider slides back and forth in the rectangular frame.

[0011] According to a preferred technical solution, centrifugal bodies are mounted on both sides of the horizontal axis to strike the outer wall of the gun head.

[0012] According to a preferred technical solution, the centrifugal body is a semicircular structure.

[0013] According to a preferred technical solution, the center of gravity of the javelin is arranged on the handle.

[0014] According to a preferred technical solution, the horizontal axis is thin in the middle and thick at both ends.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. The present invention adopts 3D printing technology to make the gun head and the gun shaft, so as to achieve uniform thickness of the inner wall, reduce shaking, and enable the javelin to be thrown farther.

[0017] 2. After the present invention is thrown out and inserted into the ground, it can be easily and quickly pulled out. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural front view of the present invention;

[0019] Figure 2 is an enlarged view of the internal structure of the handle in Example 1 of the present invention;

[0020] Figure 3 is an enlarged structural diagram of the gun head in Example 1 of the present invention;

[0021] Figure 4 is an enlarged structural diagram of the gun head in Example 2 of the present invention;

[0022] Figure 5 yes Figure 4 An enlarged view of the partial structure of the vibration device that hits the gun head.

[0023] Reference numerals

[0024] In the figure, 1 is the gun barrel, 2 is the handle, 21 is the connecting part, 22 is the inner cavity, 23 is the Velcro, 24 is the sphere, 25 is the capsule, 3 is the gun head, 4 is the vibration device, 41 is the vibration motor, 42 is the eccentric wheel, 43 is the battery compartment, 44 is the battery, 45 is the switch, 46 is the fixing frame, 47 is the electric wire, 48 is the rectangular frame, 49 is the centrifugal body, 410 is the horizontal axis, 412 is the slider, 413 is the bottom plate, 414 is the rotating disk, 5 is the threaded rod, 51 is the internal thread. DETAILED DESCRIPTION

[0025] Example 1

[0026] like Figure 1-3 As shown, this embodiment provides a 3D printed javelin, including a gun shaft 1 and a gun head 3. The javelin as a whole has a structure with pointed ends and thick in the middle. The gun shaft 1 and the gun head 3 are printed and manufactured using 3D printing equipment. The obtained gun head and gun shaft have uniform thickness, and the jitter is reduced after throwing, and the javelin is thrown farther. Among them, a grip 2 is provided in the middle of the gun shaft 1, and the center of gravity is set in the middle of the grip 2, which plays a role in increasing the overall strength and facilitating flight. Among them, a connecting part 21 is provided at one end of the handle 2 for detachable connection with one end of the gun barrel 1, an inner cavity 22 is provided in the handle 2, and a capsule 25 for containing liquid material is provided in the inner cavity 22. The liquid material is a viscous sodium silicate liquid, commonly known as water glass solution. At least one sphere 24 is placed in the viscous liquid in the capsule 25. In order to make better use of the center of gravity adjustment, the sphere 24 is made of lead material with a larger specific gravity. The lead sphere 24 in the viscous liquid material can make no sound when moving backward during the ascending stage of the javelin flight; in order to enable quick fixation and installation, Velcro 23 is provided at the bottom of the capsule 25 and the bottom wall of the inner cavity 22 for quick fixation and disassembly.

[0027] The gun barrel 1 and one end of the gun head 3 are movably connected through a threaded rod 5. An internal thread 51 is provided at one end of the gun head 3 to be connected with an external thread on the threaded rod 5. A cavity is provided in the gun head 3, and a vibration device 4 is provided in the cavity. The vibration device 4 includes a vibration motor 41 fixed to the side wall through a bracket 46. The vibration motor 41 and a switch 45 are electrically connected to a battery 44 in a battery compartment 43 through a wire 47. When the javelin is thrown and inserted into the ground, the switch 45 is pressed to rotate the vibration motor 41 to vibrate, loosening the soil around the javelin head so that the user can easily pull out the javelin. After pulling out, the switch 45 is pressed to stop the vibration motor 41 from rotating.

[0028] In order to loosen the soil around the javelin head, an eccentric wheel 42 is provided on the transmission shaft of the vibration motor 41. When the vibration motor 41 rotates, the eccentric wheel 42 is driven to rotate, thereby increasing the vibration force on the javelin head 3.

[0029] In order to further loosen the soil around the dart head, the eccentricity of the eccentric wheel 42 is a structure that gradually increases from the inside to the outside, so as to increase the looseness of the soil around the dart head.

[0030] Example 2

[0031] This embodiment provides a 3D printed javelin, which is the same as the other structures of the embodiment 1, except that: Figure 4 and 5 As shown, the vibration device 4 in this embodiment includes a transmission shaft of a vibration motor 41 passing through a bottom plate 413, a rotating disk 414 and a horizontal axis 410 and then fixedly connected to the bottom of a rectangular frame 48. A slider 412 is provided in the rectangular frame 48. The slider 412 is restricted by four frames of the rectangular frame 48. The slider 412 slides back and forth in the rectangular frame 48. The slider 412 continuously strikes the soil around the gun head during the sliding process, thereby increasing the degree of loosening of the soil around the javelin head. In order to form a continuous impact force to both sides, a centrifugal body 49 is mounted on both sides of the horizontal axis 410 to hit the outer wall of the gun head. When the vibration motor 41 rotates, the centrifugal body 49 slides on both sides of the horizontal axis 410 to form a hammering force that continuously loosens the soil around the javelin head. In this embodiment, the centrifugal body 49 is a semicircular structure. In order to prevent the centrifugal body 49 from being thrown out on the horizontal axis 410, a preferred technical solution is that the horizontal axis 410 is a structure that is thin in the middle and thick at both ends. When the centrifugal body 49 is swung, the hole in the middle of the centrifugal body 49 is timely clamped with the gradually thickened horizontal axis 410, forming a loose hammering force on the soil around the javelin head.

[0032] The preferred specific implementation modes and embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above implementation modes and embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the concept of the present invention.

Claims

1. A 3D printed javelin, comprising a gun barrel (1) and a gun head (3) formed by a 3D printing process, wherein a grip (2) is provided in the middle of the gun barrel (1), characterized in that: The gun rod (1) and one end of the gun head (3) are movably connected via a threaded rod (5); an internal thread (51) is provided at one end of the gun head (3) and is connected to an external thread on the threaded rod (5); a cavity is provided in the gun head (3), and a vibration device (4) is provided in the cavity.

2. The 3D printed javelin according to claim 1, characterized in that: The handle (2) is provided with an inner cavity (22), the inner cavity (22) is provided with a capsule (25) for containing liquid material, at least one sphere (24) is placed in the capsule (25), and the bottom of the capsule (25) and the bottom wall of the inner cavity (22) are provided with Velcro (23) for quick fixing and disassembly.

3. The 3D printed javelin according to claim 1, characterized in that: The vibration device (4) comprises a vibration motor (41) fixed to the side wall via a bracket (46); the vibration motor (41) and a switch (45) are electrically connected to a battery (44) in a battery compartment (43) via an electric wire (47).

4. The 3D printed javelin according to claim 3, characterized in that: An eccentric wheel (42) is arranged on the transmission shaft of the vibration motor (41), and the eccentricity of the eccentric wheel (42) is a structure in which the eccentricity gradually increases from the inside to the outside.

5. The 3D printed javelin according to claim 3, characterized in that: The transmission shaft of the vibration motor (41) passes through the bottom plate (413), the rotating disk (414) and the horizontal axis (410) and is fixedly connected to the bottom of the rectangular frame (48). A sliding block (412) is arranged in the rectangular frame (48).

6. The 3D printed javelin according to claim 5, characterized in that: The slider (412) slides back and forth in the rectangular frame (48).

7. The 3D printed javelin according to claim 5, characterized in that: Centrifugal bodies (49) are mounted on both sides of the transverse axis (410) for striking the outer wall of the gun head.

8. The 3D printed javelin according to claim 7, characterized in that: The centrifugal body (49) is a semicircular structure.

9. The 3D printed javelin according to claim 1, characterized in that: The center of gravity of the javelin is arranged on the handle (2).

10. The 3D printed javelin according to claim 6, characterized in that: The horizontal axis (410) is a structure that is thin in the middle and thick at both ends.

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