Ball joint mechanism with compact structure

Abstract

The invention provides a ball joint mechanism with a compact structure, which comprises a solid ball body and a shell capable of accommodating the ball body, and a ball handle is arranged at the upper part of the ball body; a stepped through hole is formed in the position, corresponding to the ball handle, of the ball body, the stepped through hole is composed of a small hole section and a large hole section, the small hole section is a threaded hole, the large hole section is an unthreaded hole, an opening of the small hole section faces upwards and is located on the ball handle, and an opening of the large hole section faces downwards and is located on the spherical surface of the ball body; an adjusting screw plug, a spring and a plunger are sequentially installed in the stepped through hole from top to bottom, one part of the adjusting screw plug is in threaded fit with the small hole section, the other part of the adjusting screw plug is located in the large hole section, the outer side end of the plunger can extend outwards from an opening of the large hole section under the elastic force action of the spring, and the end face of the outer side end of the plunger is a spherical surface; a curved surface seat is arranged on the lower portion of the shell, the curved surface seat is provided with an inner concave surface, and the outer side end face of the plunger is in contact fit with the inner concave surface of the curved surface seat. The ball body in the structure can obtain large damping feeling during rotation and is very smooth during rotation.

Description

Technical Field

[0001] The present invention relates to the technical field of ball joints, and specifically relates to a ball joint mechanism with a compact structure. Background Art

[0002] A ball joint is a common mechanical structure that enables the object mounted thereon to achieve free swinging and rotation in multiple directions. For example, a pan-tilt used for mounting cameras and video cameras is a typical ball joint. A ball joint usually consists of a housing with a spherical mounting groove and a sphere, and the sphere is movably mounted inside the housing.

[0003] The specification of Chinese Invention Patent No. 2023219062485 discloses a ball joint mechanism capable of automatic return, including a sphere and a housing capable of accommodating the sphere. A vertical ball handle is provided on the upper part of the sphere. A ball support, an elastic member, and a support member are installed inside the housing; the ball support is used to support the sphere, and the support member provides elastic support for the ball support through the elastic member. A horizontal section plane is formed at the lower part of the sphere, and the upper surface of the ball support is a plane. The upper surface of the ball support is in contact or not in contact with the lower part of the sphere, so that not only can the sphere obtain a greater sense of damping when rotating, but also it can automatically return. However, the ball support in this ball joint mechanism is prone to jamming, making the rotation of the sphere not smooth enough. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a ball joint mechanism with a compact structure, which can make the rotation of the sphere smoother.

[0005] To solve the above technical problem, the technical solution of the present invention is: a ball joint mechanism with a compact structure, including a sphere and a housing capable of accommodating the sphere. A ball handle is provided on the upper part of the sphere; the sphere is a solid structure, and a stepped through hole is provided at the position of the sphere corresponding to the ball handle. The stepped through hole consists of a small hole section and a large hole section. The small hole section is a threaded hole, and the large hole section is a light hole. The opening of the small hole section faces upward and is located on the ball handle, and the opening of the large hole section faces downward and is located on the spherical surface of the sphere; an adjusting plug, a spring, and a plunger are sequentially installed in the stepped through hole from top to bottom. A part of the adjusting plug is in threaded cooperation with the small hole section, and the other part is located in the large hole section. Under the elastic force of the spring, the outer end of the plunger can extend outwards from the opening of the large hole section, and the end surface of the outer end of the plunger is a spherical surface; a curved surface seat is provided at the lower part of the housing, and the curved surface seat has a concave surface. The outer end surface of the plunger is in contact and cooperation with the concave surface of the curved surface seat.

[0006] In the above technical solution, an adjusting plug, a spring and a plunger are arranged inside the solid sphere, and a curved seat with a concave surface is arranged at the lower part of the sphere. Under the elastic force of the spring, the outer end surface of the plunger is in contact and cooperation with the concave surface of the curved seat, so that the sphere obtains elastic support. When the sphere rotates, it can obtain a large damping feeling and rotate very smoothly. When it is necessary to increase the damping force, only need to tighten the adjusting plug downward, thereby increasing the pre-tightening force of the spring.

[0007] Furthermore, a ball bushing is installed in the large-hole section of the sphere, and the plunger is installed in the ball bushing. This can avoid jamming when the plunger moves in the large-hole section of the sphere.

[0008] As a preferred technical solution, the curvature of the concave surface of the curved seat is greater than the spherical curvature of the sphere, and a crescent-shaped gap is formed between the concave surface of the curved seat and the spherical surface of the sphere. With this structure, when the sphere is in the return-to-normal state, the damping force between the sphere and the curved seat is the smallest. When the sphere is rotated to make the ball handle tilt in all directions, the damping force between the sphere and the curved seat will gradually increase, so that the sphere will be forced to return to normal automatically.

[0009] As a preferred technical solution, the central gap of the crescent-shaped gap is 6 mm.

[0010] As a preferred technical solution, the outer end surface of the plunger is an arc surface.

[0011] Furthermore, a polygonal blind hole is provided on the upper end surface of the adjusting plug.

[0012] Furthermore, a rubber pad is provided between the housing and the sphere.

[0013] Furthermore, a rotating base and a base fixing knob are provided at the bottom of the housing. Description of the Drawings

[0014] Figure 1 It is a schematic structural diagram of the sphere in the return-to-normal state in Embodiment 1 of the present invention; Figure 2 It is a schematic structural diagram of the sphere in the tilted state in Embodiment 1 of the present invention; Figure 3 It is a schematic structural diagram of the sphere in the return-to-normal state in Embodiment 2 of the present invention; Figure 4 It is a schematic structural diagram of the sphere in the tilted state in Embodiment 2 of the present invention; Reference numerals are: 1. Sphere; 2. Housing; 3. Rubber pad; 4. Rotating base; 5. Base fixing knob; 6. Adjusting plug; 7. Spring; 8. Plunger; 9. Curved seat; 10. Ball bushing. Detailed Embodiments

[0015] In order to make the purpose, technical solution and advantages of the invention more clear and understandable, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not limited to the present invention. Embodiment 1

[0016] As Figure 1 、 2 shown, a structurally compact ball joint mechanism includes a sphere 1 and a housing 2 capable of accommodating the sphere 1. A rubber pad 3 is provided between the housing 2 and the sphere 1. A ball handle is provided on the upper part of the sphere 1, and a rotating base 4 and a base fixing knob 5 are provided at the bottom of the housing 2; the sphere 1 is a solid structure, and a stepped through hole is provided at the position of the sphere 1 corresponding to the ball handle. This stepped through hole consists of a small hole section and a large hole section. The small hole section is a threaded hole, and the large hole section is a smooth hole. The opening of the small hole section faces upward and is located on the ball handle, and the opening of the large hole section faces downward and is located on the spherical surface of the sphere 1. An adjusting plug 6, a spring 7 and a plunger 8 are sequentially installed in the stepped through hole from top to bottom. A part of the adjusting plug 6 is in threaded cooperation with the small hole section, and the other part is located in the large hole section. A polygonal blind hole is provided on the upper end face of the adjusting plug 6. Under the elastic force of the spring 7, the outer end of the plunger 8 can extend outward from the opening of the large hole section, and the end face of the outer end of the plunger 8 is a spherical surface; a curved surface seat 9 is provided at the lower part of the housing 2. This curved surface seat 9 has a concave surface, and the outer end face of the plunger 8 is an arc surface and is in contact and cooperation with the concave surface of the curved surface seat 9; the curvature of the concave surface of the curved surface seat 9 is greater than the spherical curvature of the sphere 1, and a crescent-shaped gap is formed between the concave surface of the curved surface seat 9 and the spherical surface of the sphere 1. The center gap of the crescent-shaped gap is preferably 6 mm.

[0017] In this embodiment, by arranging an adjusting plug 6, a spring 7 and a plunger 8 in the solid sphere 1, and arranging a curved surface seat 9 with a concave surface at the lower part of the sphere 1, the outer end face of the plunger 8 is in contact and cooperation with the concave surface of the curved surface seat 9 under the elastic force of the spring 7, so that the sphere 1 obtains elastic support. The sphere 1 can obtain a large damping feeling when rotating and is very smooth when rotating. When it is necessary to increase the damping force, only need to tighten the adjusting plug 6 downward, thereby increasing the pre-tightening force of the spring 7.

[0018] Since a crescent-shaped gap is formed between the concave surface of the curved surface seat 9 and the spherical surface of the sphere 1, with this structure, when the sphere 1 is in the return-to-normal state, the damping force between the sphere 1 and the curved surface seat 9 is the smallest. When the sphere 1 is rotated to make the ball handle tilt in all directions, the damping force between the sphere 1 and the curved surface seat 9 will gradually increase, which will force the sphere 1 to automatically return to normal. Embodiment 2

[0019] As Figure 3 、 4As shown in the figure, the inventive concept and overall structure of this embodiment are basically the same as those of Embodiment 1. The difference is that on the basis of Embodiment 1, a ball bushing 10 is installed in the large-hole section of the sphere 1, and then the plunger 8 is installed in the ball bushing 10. This can avoid jamming when the plunger 8 moves in the large-hole section of the sphere 1.

[0020] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the scope of the present invention patent.

[0021] In order to enable those of ordinary skill in the art to more conveniently understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified. For the sake of clarity, some other elements have also been omitted from this application document. Those of ordinary skill in the art should be aware that these omitted elements may also constitute the content of the present invention.

Claims

1. A structurally compact ball joint mechanism, comprising a sphere (1) and a housing (2) capable of accommodating the sphere (1), wherein a ball handle is provided on the upper part of the sphere (1); characterized in that: The sphere (1) is of a solid structure. A stepped through-hole is provided at the position of the sphere (1) corresponding to the ball handle. The stepped through-hole consists of a small-hole section and a large-hole section. The small-hole section is a threaded hole, and the large-hole section is a smooth hole. The opening of the small-hole section faces upward and is located on the ball handle, and the opening of the large-hole section faces downward and is located on the spherical surface of the sphere (1). An adjusting plug (6), a spring (7), and a plunger (8) are sequentially installed in the stepped through-hole from top to bottom. A part of the adjusting plug (6) is in threaded fit with the small-hole section, and the other part is located in the large-hole section. Under the elastic force of the spring (7), the outer end of the plunger (8) can extend outwards from the opening of the large-hole section, and the end face of the outer end of the plunger (8) is a spherical surface. A curved surface seat (9) is provided at the lower part of the housing (2). The curved surface seat (9) has a concave surface, and the outer end face of the plunger (8) is in contact and cooperation with the concave surface of the curved surface seat (9).

2. The compact ball joint mechanism according to claim 1, characterized in that: A ball bearing sleeve (10) is installed in the large-hole section of the sphere (1), and the plunger (8) is installed in the ball bearing sleeve (10).

3. The compact ball joint mechanism according to claim 1, characterized in that: The curvature of the concave surface of the curved surface seat (9) is greater than the spherical curvature of the sphere (1), and a crescent-shaped gap is formed between the concave surface of the curved surface seat (9) and the spherical surface of the sphere (1).

4. The compact ball joint mechanism according to claim 3, characterized in that: The central gap of the crescent-shaped gap is 6 mm.

5. The compact ball joint mechanism according to any one of claims 1 to 3, characterized in that: The outer end face of the plunger (8) is an arc surface.

6. The compact ball joint mechanism according to any one of claims 1 to 3, characterized in that: A polygonal blind hole is provided on the upper end face of the adjusting plug (6).

7. The compact ball joint mechanism according to any one of claims 1 to 3, characterized in that: A rubber gasket (3) is further provided between the housing (2) and the sphere (1).

8. The compact ball joint mechanism according to any one of claims 1 to 3, characterized in that: A rotating base (4) and a base fixing knob (5) are provided at the bottom of the housing (2).

Images