A dual-rotation shaft connecting piece and glasses

Abstract

The application discloses a double-rotating shaft connecting piece and glasses and belongs to the technical field of electronics. The double-rotating shaft connecting piece comprises a first rotating shaft, a second rotating shaft, a first gear, a second gear, a first limiting protrusion, a second limiting protrusion and a third limiting protrusion. The first end of the first rotating shaft is connected with the first gear, and the second end of the first rotating shaft is connected with the first limiting protrusion. The first end of the second rotating shaft is connected with the second gear, and the second end of the second rotating shaft is connected with the second limiting protrusion. The outer circumferential surfaces of the first gear and the second gear are meshed and connected. The third limiting protrusion is arranged on the rotating track line of the first limiting protrusion and the second limiting protrusion. When the first rotating shaft and the second rotating shaft rotate, the first limiting protrusion and the second limiting protrusion are driven to rotate until the first limiting protrusion and the second limiting protrusion abut against the first limiting protrusion and the rotation of the first rotating shaft and the second rotating shaft is prevented. The double-rotating shaft connecting piece has the characteristics of controlling the rotation angle of the rotating shaft and good rotation feeling.

Description

Technical Field

[0001] This invention relates to the field of electronic technology, specifically to a dual-axis connector and eyeglasses. Background Technology

[0002] A hinge is a shaft that connects the main components of a product and is used for rotation, bearing both bending moment and torque. Common types of hinges include: eyeglass hinges (ordinary eyeglasses or smart glasses), mobile phone hinges (flip or rotating screen phones), and laptop hinges, etc.

[0003] In existing technology, the hinge can rotate arbitrarily, but the angle of rotation is difficult to control. This results in inconsistent temple rotation during the process, leading to different situations for users with different head shapes. For example, users with small heads may find the glasses don't stay on properly, while users with large heads may find the temples easily flip outwards. Furthermore, the connection between the hinge and the temple / frame is typically achieved by connecting the hinge to both sides of the hinge. This method requires increasing the width of the hinge to facilitate connection with the temple and frame. Additionally, connecting the hinge to the temple and frame usually requires other connecting structures besides the hinge itself, making assembly complex.

[0004] Based on the shortcomings of the existing hinges, it is necessary to design a hinge that can rotate to a preset angle to meet the needs of different users. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems of difficult control of the rotation angle of the existing rotating shaft and complicated assembly when connecting the rotating shaft to the temple and frame. This invention provides a dual rotating shaft connector and eyeglasses.

[0006] In a first aspect, the present invention provides a dual-shaft connector, the technical solution of which is as follows:

[0007] A dual-shaft connector includes a first shaft, a second shaft, a first gear, a second gear, a first limiting protrusion, a second limiting protrusion, and a third limiting protrusion, wherein:

[0008] Both the first rotating shaft and the second rotating shaft are arranged along a first direction. Along the first direction, the first end of the first rotating shaft is connected to the first gear, and the second end of the first rotating shaft is connected to the first limiting protrusion. The first end of the second rotating shaft is connected to the second gear. The outer peripheral surfaces of the first gear and the second gear are meshed together.

[0009] The third limiting protrusion is located on the rotation trajectory line of the first limiting protrusion; when the first rotating shaft rotates along the first rotation direction, it drives the first limiting protrusion to rotate until the first limiting protrusion abuts against the third limiting protrusion and prevents the first rotating shaft and the second rotating shaft from rotating.

[0010] The second limiting protrusion is located at the second end of the first rotating shaft, and the third limiting protrusion is located on the rotation trajectory line of the second limiting protrusion. When the first rotating shaft rotates in a second rotation direction opposite to the first rotation direction, it drives the second limiting protrusion to rotate until the second limiting protrusion abuts against the third limiting protrusion, thus preventing the first rotating shaft and the second rotating shaft from rotating. Alternatively, the second limiting protrusion is located on the rotation trajectory line of the first limiting protrusion. When the first rotating shaft rotates in the second rotation direction, it drives the first limiting protrusion to rotate until the first limiting protrusion abuts against the second limiting protrusion, thus preventing the first rotating shaft and the second rotating shaft from rotating.

[0011] Preferably, it further includes a fourth limiting protrusion, a fifth limiting protrusion, and a sixth limiting protrusion, wherein:

[0012] The fourth limiting protrusion is connected to the second end of the second rotating shaft, and the sixth limiting protrusion is located on the rotation trajectory line of the fourth limiting protrusion. When the second rotating shaft rotates along the first rotation direction, it drives the fourth limiting protrusion to rotate until the fourth limiting protrusion abuts against the sixth limiting protrusion and prevents the second rotating shaft and the first rotating shaft from rotating.

[0013] The fifth limiting protrusion is located at the second end of the second rotating shaft, and the sixth limiting protrusion is located on the rotation trajectory line of the fifth limiting protrusion. When the second rotating shaft rotates in the second rotation direction, it drives the fifth limiting protrusion to rotate until the fifth limiting protrusion abuts against the sixth limiting protrusion, thus preventing the second rotating shaft and the first rotating shaft from rotating; or, the fifth limiting protrusion is located on the rotation trajectory line of the second rotating shaft. When the second rotating shaft rotates in the second rotation direction, it drives the second rotating shaft to rotate until the fourth limiting protrusion abuts against the fifth limiting protrusion, thus preventing the second rotating shaft and the first rotating shaft from rotating.

[0014] Preferably, the dual-shaft connector further includes a first fixed base, through which the first shaft passes, and is disposed on the rotation trajectory line of the first limiting protrusion based on the third limiting protrusion, the third limiting protrusion being connected to the first fixed base; or, based on the second limiting protrusion and the third limiting protrusion both being disposed on the rotation trajectory line of the first limiting protrusion, the second limiting protrusion and the third limiting protrusion both being connected to the first fixed base.

[0015] Preferably, both the first and second rotating shafts pass through the first fixed base, and the sixth limiting protrusion is located on the rotation trajectory line of the fourth limiting protrusion, with the sixth limiting protrusion connected to the first fixed base; or, both the fifth and sixth limiting protrusions are located on the rotation trajectory line of the fourth limiting protrusion, with both the fifth and sixth limiting protrusions connected to the first fixed base.

[0016] Preferably, both the first rotating shaft and the second rotating shaft pass through the first fixed base, and the fifth limiting protrusion and the sixth limiting protrusion are both located on the rotation trajectory line of the fourth limiting protrusion and connected to the first fixed base.

[0017] Preferably, the dual-shaft connector further includes a seventh limiting protrusion, which is connected to the second end of the first shaft; when the first shaft rotates in a first rotation direction, the first limiting protrusion abuts against the second limiting protrusion; when the first shaft rotates in a second rotation direction, the seventh limiting protrusion abuts against the third limiting protrusion.

[0018] Preferably, the dual-shaft connector further includes a first spring, a second spring, a first connecting sleeve, a second connecting sleeve, and a fourth limiting protrusion, wherein the first spring and the first connecting sleeve are both sleeved on the second end of the first shaft, and the first spring is sandwiched between the first connecting sleeve and the first limiting protrusion.

[0019] The fourth limiting protrusion is connected to the second end of the second rotating shaft. The second spring and the second connecting sleeve are both sleeved on the second end of the second rotating shaft, and the second spring is sandwiched between the second connecting sleeve and the fourth limiting protrusion.

[0020] Preferably, the first connecting sleeve is provided with a first sliding groove and a first fixed boss, the second end of the first rotating shaft is provided with a first sliding protrusion, the first sliding protrusion is located in the first sliding groove, and the first spring is clamped between the first fixed boss and the first limiting protrusion; the second connecting sleeve is provided with a second sliding groove and a second fixed boss, the second end of the second rotating shaft is provided with a second sliding protrusion, the second sliding protrusion is located in the second sliding groove, and the second spring is clamped between the second fixed boss and the second limiting protrusion.

[0021] Preferably, the second end of the first rotating shaft is provided with a stepped surface, and one end of the first connecting sleeve can abut against the stepped surface.

[0022] Preferably, the dual-shaft connector further includes a housing, and the dual-shaft connector further includes a housing and a movable base, wherein the movable base, the first spring, and the second spring are all located inside the housing; the first connecting sleeve passes through the movable base and the movable base is located between the inner wall of the housing and the first spring, and / or, the second connecting sleeve passes through the movable base and the movable base is located between the inner wall of the housing and the second spring.

[0023] Secondly, the present invention provides a pair of eyeglasses, the technical solution of which is as follows:

[0024] A pair of eyeglasses includes the dual-axis connector described in the first aspect, as well as temples and a frame, wherein the dual-axis connector is disposed at the connection position between the frame and the temples.

[0025] The present invention has the following beneficial effects:

[0026] 1. In this invention, during the rotation of the first and second rotating shafts, when a force is applied to control the rotation of the first rotating shaft, the first rotating shaft drives the first gear to rotate under this force. When no rotational force is applied to the first rotating shaft, the first gear does not rotate. Therefore, the first rotating shaft can only rotate with the increase of external force, thus preventing the first rotating shaft from rotating arbitrarily without the application of external force. Furthermore, by combining the first, second, and third limiting protrusions, the continuous rotation of the first rotating shaft is prevented, and the maximum rotation angle of the first rotating shaft is limited, thereby achieving the function of controlling the rotation angle of the first and second rotating shafts, and having the characteristic of controllable rotation angle.

[0027] 2. The dual-axis connector of this invention adopts a compressed installation design, which simplifies assembly and improves work efficiency. Furthermore, the dual-axis connector of this invention connects to the temple and frame at both ends, shortening the lateral structure of the connector and thus reducing its width. Additionally, the compression design in the vertical direction of the dual-axis connector reduces the size of the mounting cavity at the temple and frame connection. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the internal structure of a dual-shaft connector provided by the present invention;

[0029] Figure 2 This is a schematic diagram of the structure of the second fixed base and the limiting protrusion provided by the present invention;

[0030] Figure 3 This is a schematic diagram of the structure of the third fixed base and the limiting protrusion provided by the present invention;

[0031] Figure 4 This is a schematic diagram of the structure of the first fixed base and the limiting protrusion provided by the present invention;

[0032] Figure 5 This is a schematic diagram of the structure of the first rotating shaft and the second rotating shaft connected to the first connecting sleeve and the second connecting sleeve provided by the present invention;

[0033] Figure 6 This is a schematic diagram of the external structure of a dual-shaft connector provided by the present invention;

[0034] Figure 7 This is a schematic diagram of the structure of the dual-axis connector provided by the present invention connecting the temple and the frame;

[0035] Figure 8 This is a schematic diagram of the structure of a pair of glasses provided by the present invention.

[0036] Reference numerals: 100-Double-shaft connector; 101-First shaft; 102-Second shaft; 103-First gear; 104-Second gear; 105-First limiting protrusion; 106-Second limiting protrusion; 107-Third limiting protrusion; 108-Fourth limiting protrusion; 109-Fifth limiting protrusion; 110-Sixth limiting protrusion; 111-Seventh limiting protrusion; 112-Eighth limiting protrusion; 113-First fixed base; 114-Second fixed base; 115-Third fixed base; 116-First spring; 117-Second spring; 1 18-First connecting sleeve; 119-Second connecting sleeve; 120-First sliding groove; 121-Second sliding groove; 122-First fixing boss; 123-Second fixing boss; 124-Step surface; 125-Housing shell; 1251-First housing shell; 1252-Second housing shell; 126-Modible base; 127-First contact surface; 128-Second contact surface; 129-Third contact surface; 130-Fourth contact surface; 131-Fifth contact surface; 132-First sliding protrusion; 133-Second sliding protrusion; 200-Template; 300-Frame. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention; that is, the described embodiments are only a part of the embodiments of the invention, and not all of them.

[0038] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing the invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0039] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in certain situations to indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0040] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0041] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0042] Example 1

[0043] like Figure 1 As shown, this embodiment provides a dual-shaft connector 100, including a first shaft 101, a second shaft 102, a first gear 103, a second gear 104, a first limiting protrusion 105, a second limiting protrusion 106, and a third limiting protrusion 107, wherein:

[0044] Both the first rotating shaft 101 and the second rotating shaft 102 are arranged along the first direction. Along the first direction, the first end of the first rotating shaft 101 is connected to the first gear 103, and the second end of the first rotating shaft 101 is connected to the first limiting protrusion 105. The first end of the second rotating shaft 102 is connected to the second gear 104. The outer peripheral surfaces of the first gear 103 and the second gear 104 are meshed together.

[0045] The third limiting protrusion 107 is located on the rotation trajectory line of the first limiting protrusion 105; when the first rotating shaft 101 rotates along the first rotation direction, it drives the first limiting protrusion 105 to rotate until the first limiting protrusion 105 abuts against the third limiting protrusion 107 and prevents the first rotating shaft 101 and the second rotating shaft 102 from rotating.

[0046] The second limiting protrusion 106 is located at the second end of the first rotating shaft 101, and the third limiting protrusion 107 is located on the rotation trajectory line of the second limiting protrusion 106. When the first rotating shaft 101 rotates in a second rotation direction opposite to the first rotation direction, it drives the second limiting protrusion 106 to rotate until the second limiting protrusion 106 abuts against the third limiting protrusion 107 and prevents the first rotating shaft 101 and the second rotating shaft 102 from rotating. Alternatively, the second limiting protrusion 106 is located on the rotation trajectory line of the first limiting protrusion 105. When the first rotating shaft 101 rotates in the second rotation direction, it drives the first limiting protrusion 105 to rotate until the first limiting protrusion 105 abuts against the second limiting protrusion 106 and prevents the first rotating shaft 101 and the second rotating shaft 102 from rotating.

[0047] In this embodiment, the first rotating shaft 101 and the second rotating shaft 102 are both arranged in the same direction, which is designated as the first direction. Along the first direction, the first gear 103 is fixedly connected to the end near the first end of the first rotating shaft 101, and the second end of the first rotating shaft 101 is connected to the first limiting protrusion 105. The second gear 104 is fixedly connected to the end near the first end of the second rotating shaft 102. Thus, the first gear 103 on the first rotating shaft 101 and the second gear 104 on the second rotating shaft 102 mesh with each other, so that when the first rotating shaft 101 rotates relative to the second rotating shaft 102, it drives the first gear 103 to rotate, and then the first gear 103 drives the second gear 104 to rotate, and the second gear 104 drives the second gear 104 to rotate. Only one of the two rotating shafts needs to be rotated, and the other rotating shaft will also rotate accordingly. The third limiting protrusion 107 is disposed on the rotation trajectory line of the first limiting protrusion 105 and the second limiting protrusion 106. The third limiting protrusion 107 is a static object relative to the first limiting protrusion 105 and the second limiting protrusion 106. When the first rotating shaft 101 rotates relative to the second rotating shaft 102 in the first rotation direction or the second rotation direction, it drives the first limiting protrusion 105 or the second limiting protrusion 106 to rotate relative to the third limiting protrusion 107 until the first limiting protrusion 105 or the second limiting protrusion 106 abuts against the third limiting protrusion 107. The third limiting protrusion 107 prevents the first limiting protrusion 105 or the second limiting protrusion 106 from continuing to rotate, thereby preventing the first gear 103 from rotating, and further preventing the first rotating shaft 101 and the second rotating shaft 102 from rotating. Alternatively, the second limiting protrusion 106 is connected to the second end of the first rotating shaft 101, and the second limiting protrusion 106 and the third limiting protrusion 107 are simultaneously set on the rotation trajectory line of the first limiting protrusion 105. For the first limiting protrusion 105, the second limiting protrusion 106 and the third limiting protrusion 107 are static objects. When the first rotating shaft 101 rotates along the second rotation direction, it drives the first limiting protrusion 105 to rotate relative to the second limiting protrusion 106 or the third limiting protrusion 107 until the first limiting protrusion 105 abuts against the second limiting protrusion 106 or the third limiting protrusion 107. The second limiting protrusion 106 or the third limiting protrusion 107 prevents the first limiting protrusion 105 from continuing to rotate, thereby preventing the first gear 103 from rotating, and further preventing the first rotating shaft 101 and the second rotating shaft 102 from rotating.

[0048] In this embodiment, during the rotation of the first rotating shaft 101 and the second rotating shaft 102, when a force is applied to control the rotation of the first rotating shaft 101, the first rotating shaft 101 drives the first gear 103 to rotate under this force. When no rotational force is applied to the first rotating shaft 101, the first gear 103 does not rotate (the second rotating shaft 102 rotates along with the rotation of the first rotating shaft 101 and also stops rotating). Therefore, the first rotating shaft 101 can only rotate with the increase of external force, thereby preventing the first rotating shaft 101 from rotating arbitrarily without the application of external force. Furthermore, the combined arrangement of the first limiting protrusion 105, the second limiting protrusion 106, and the third limiting protrusion 107 prevents the first rotating shaft 101 from rotating continuously and limits the maximum rotation angle of the first rotating shaft 101, thereby achieving the function of controlling the rotation angle of the first rotating shaft 101 and the second rotating shaft 102.

[0049] In this embodiment, the first gear 103 can be sleeved on the first rotating shaft 101, and the first gear 103 can be directly or indirectly connected to the first rotating shaft 101; alternatively, the first rotating shaft 101 and the first rotating shaft 102 can be integrally formed. The second gear 104 is sleeved on the second rotating shaft 102, and the second gear 104 is fixedly connected to the second rotating shaft 102; alternatively, the first gear 103 and the second rotating shaft 102 can be integrally formed.

[0050] In this embodiment, the first limiting protrusion 105 is sleeved on the first rotating shaft 101, and the first limiting protrusion 105 is directly or indirectly connected to the first rotating shaft 101; alternatively, the first limiting protrusion 105 and the first rotating shaft 101 can be integrally formed.

[0051] In this embodiment, the shape, size, and position of the third limiting protrusion 107 are not limited. It is only necessary to position the third limiting protrusion 107 such that when the first rotating shaft 101 and the second rotating shaft 102 rotate, it can restrict the rotational position of the first rotating shaft 101 and the second rotating shaft 102. The following is merely an example of one possible position setting for the third limiting protrusion 107 and does not represent all possible positions of the third limiting protrusion 107; for example:

[0052] Based on the fact that the third limiting protrusion 107 is disposed on the rotation trajectory line of the first limiting protrusion 105 and the second limiting protrusion 106, and the third limiting protrusion 107 is positioned between the first limiting protrusion 105 and the second limiting protrusion 106, when the first limiting protrusion 105 and the second limiting protrusion 106 rotate relative to the third limiting protrusion 107, the first limiting protrusion 105 or the second limiting protrusion 106 abuts against the third limiting protrusion 107, which can prevent the first rotating shaft 101 or the second rotating shaft 102 from rotating. Alternatively, based on the fact that the second limiting protrusion 106 and the third limiting protrusion 107 are simultaneously arranged on the rotation trajectory of the first limiting protrusion 105, and the first limiting protrusion 105 is located between the third limiting protrusion 107 and the second limiting protrusion 106, since the first limiting protrusion 105 is arranged on the first rotating shaft 101, when the first limiting protrusion 105 rotates relative to the second limiting protrusion 106 and the third limiting protrusion 107, the first limiting protrusion 105 abuts against the second limiting protrusion 106 or the third limiting protrusion 107, which can prevent the first rotating shaft 101 and the second rotating shaft 102 from rotating.

[0053] In this embodiment, the rotation angle of the first rotating shaft 101 can be controlled by setting the distance between the first limiting protrusion 105, the second limiting protrusion 106, and the third limiting protrusion 107. For example, when the third limiting protrusion 107 is located on the rotation trajectory line of the first limiting protrusion 105 and the second limiting protrusion 106, and the first limiting protrusion 105 and the second limiting protrusion 106 are arranged opposite each other, the maximum rotation angle of the first rotating shaft 101 is 180°; when the first limiting protrusion 105 and the second limiting protrusion 106 are not arranged opposite each other, the maximum rotation angle of the first rotating shaft 101 may exceed 180° or be less than 180°.

[0054] In this embodiment, two rotating shafts, a first rotating shaft 101 and a second rotating shaft 102, are used and combined with a first gear 103 and a second gear 104. During the rotation of the first rotating shaft 101, the first gear 103 on the first rotating shaft 101 drives the second gear 104 to rotate, thereby the second gear 104 drives the second rotating shaft 102 to rotate. When the first rotating shaft 101 rotates 45°, it also drives the second rotating shaft 102 to rotate 45°, thus allowing the two rotating shafts to rotate as a whole by 90°. If installed between the temple 200 and the frame 300, the included angle between the temple 200 and the frame 300 can change to 90°, thus not only meeting the user's wearing needs but also making operation more convenient.

[0055] In this embodiment, the first gear 103 and the second gear 104 are meshed together, so that rotating the first shaft 101 drives the second shaft 102 to rotate. Due to the special structure of the gears, when rotating the first shaft 101 and / or the second shaft 102, it is not only easier to control the rotation angle, but also provides a better feel for the user.

[0056] In some embodiments, the contact surfaces of the first limiting protrusion 105, the second limiting protrusion 106, and the third limiting protrusion 107 that come into contact during operation are curved, which makes the operation feel smoother when the first rotating shaft 101 and the second rotating shaft 102 are limited by the contact surfaces of the limiting protrusions.

[0057] Optionally, such as Figure 1-3 As shown, it also includes a fourth limiting protrusion 108, a fifth limiting protrusion 109, and a sixth limiting protrusion 110, wherein:

[0058] The fourth limiting protrusion 108 is connected to the second end of the second rotating shaft 102. The sixth limiting protrusion 110 is located on the rotation trajectory line of the fourth limiting protrusion 108. When the second rotating shaft 102 rotates in the first rotation direction, it drives the fourth limiting protrusion 108 to rotate until the fourth limiting protrusion 108 abuts against the sixth limiting protrusion 110 and prevents the second rotating shaft 102 and the first rotating shaft 101 from rotating.

[0059] The fifth limiting protrusion 109 is located at the second end of the second rotating shaft 102, and the sixth limiting protrusion 110 is located on the rotation trajectory line of the fifth limiting protrusion 109. When the second rotating shaft 102 rotates in the second rotation direction, it drives the fifth limiting protrusion 109 to rotate until the fifth limiting protrusion 109 and the sixth limiting protrusion 110 abut against each other, thus preventing the second rotating shaft 102 and the first rotating shaft 101 from rotating. Alternatively, the fifth limiting protrusion 109 is located on the rotation trajectory line of the second rotating shaft 102. When the second rotating shaft 102 rotates in the second rotation direction, it drives the second rotating shaft 102 to rotate until the fourth limiting protrusion 108 abuts against the fifth limiting protrusion 109, thus preventing the second rotating shaft 102 and the first rotating shaft 101 from rotating.

[0060] In this embodiment, the second end of the second rotating shaft 102 is connected to the fourth limiting protrusion 108. The sixth limiting protrusion 110 is disposed on the rotation trajectory line of the fourth limiting protrusion 108 and the fifth limiting protrusion 109. The sixth limiting protrusion 110 is a static object relative to the fourth limiting protrusion 108 and the fifth limiting protrusion 109. When the second rotating shaft 102 rotates in the first rotation direction or the second rotation direction, it drives the fourth limiting protrusion 108 and the fifth limiting protrusion 109 to rotate relative to the sixth limiting protrusion 110 until the fourth limiting protrusion 108 or the fifth limiting protrusion 109 abuts against the sixth limiting protrusion 110. The sixth limiting protrusion 110 prevents the fourth limiting protrusion 108 and the fifth limiting protrusion 109 from continuing to rotate relative to the sixth limiting protrusion 110, thereby preventing the first gear 103 from rotating, and further preventing the second rotating shaft 102 and the first rotating shaft 101 from rotating. Alternatively, the fifth limiting protrusion 109 is connected to the second end of the second rotating shaft 102, and the fifth limiting protrusion 109 and the sixth limiting protrusion 110 are simultaneously set on the rotation trajectory line of the fourth limiting protrusion 108. For the fourth limiting protrusion 108, the fifth limiting protrusion 109 and the sixth limiting protrusion 110 are static objects. When the second rotating shaft 102 rotates along the second rotation direction, it drives the fourth limiting protrusion 108 to rotate relative to the fifth limiting protrusion 109 and the sixth limiting protrusion 110 until the fourth limiting protrusion 108 abuts against the fifth limiting protrusion 109 or the sixth limiting protrusion 110. The fifth limiting protrusion 109 or the sixth limiting protrusion 110 prevents the fourth limiting protrusion 108 from continuing to rotate, thereby preventing the first gear 103 from rotating, and further preventing the second rotating shaft 102 and the first rotating shaft 101 from rotating.

[0061] In this embodiment, by setting the fourth limiting protrusion 108, the fifth limiting protrusion 109 and the sixth limiting protrusion 110, combined with the setting of the first limiting protrusion 105, the second limiting protrusion 106 and the third limiting protrusion 107, not only can the rotation of the first rotating shaft 101 and the second rotating shaft 102 be limited, but also the first rotating shaft 101 and the second rotating shaft 102 are both provided with limiting structures, which further improves the stability of the dual rotating shaft connector 100.

[0062] Optionally, such as Figure 1-4 As shown, the dual-shaft connector 100 also includes a first fixed base 113, through which the first shaft 101 passes. The first shaft 101 is positioned on the rotation trajectory line of the first limiting protrusion 105 based on the third limiting protrusion 107, and the third limiting protrusion 107 is connected to the first fixed base 113; or, based on the second limiting protrusion 106 and the third limiting protrusion 107 both being positioned on the rotation trajectory line of the first limiting protrusion 105, the second limiting protrusion 106 and the third limiting protrusion 107 are both connected to the first fixed base 113.

[0063] In this embodiment, the first fixed base 113 facilitates the processing and assembly of the relevant components of the dual-shaft connector 100.

[0064] In some embodiments, such as Figure 2-4 As shown, the first fixed base 113 has a first contact surface 127, a fourth contact surface 130, and a second contact surface 128 connected in sequence; the first limiting protrusion 105 and the second limiting protrusion 106 each have a third contact surface 129 and a fifth contact surface 131; the third contact surface 129, the first contact surface 127, the fourth contact surface 130, the second contact surface 128, and the fifth contact surface 131 are connected in sequence; when the first limiting protrusion 105 and the second limiting protrusion 106 rotate relative to the third limiting protrusion 107, the surface of the third limiting protrusion 107 can sequentially contact the third contact surface 129, the first contact surface 127, and the fourth contact surface 130. The second contact surface 128 and the fifth contact surface 131 are in contact; or, the surface of the third limiting protrusion 107 may sequentially contact the fifth contact surface 131, the second contact surface 128, the fourth contact surface 130, the first contact surface 127 and the third contact surface 129; when the surface of the third limiting protrusion 107 contacts the third contact surface 129 or the fifth contact surface 131, the third contact surface 129 or the fifth contact surface 131 may prevent the third limiting protrusion 107 from continuing to rotate relative to the first limiting protrusion 105 and the second limiting protrusion 106, that is, prevent the first limiting protrusion 105 and the second limiting protrusion 106 from continuing to rotate relative to the third limiting protrusion 107.

[0065] Alternatively, both the third limiting protrusion 107 and the second limiting protrusion 106 have a third contact surface 129 and a fifth contact surface 131; the third contact surface 129, the first contact surface 127, the fourth contact surface 130, the second contact surface 128, and the fifth contact surface 131 are connected in sequence; when the first limiting protrusion 105 rotates relative to the second limiting protrusion 106 and the third limiting protrusion 107, the surface of the first limiting protrusion 105 can sequentially contact the third contact surface 129, the first contact surface 127, the fourth contact surface 130, the second contact surface 128, and the fifth contact surface 131; or, The surface of the first limiting protrusion 105 can sequentially contact the fifth contact surface 131, the second contact surface 128, the fourth contact surface 130, the first contact surface 127, and the third contact surface 129. When the surface of the first limiting protrusion 105 contacts the third contact surface 129 or the fifth contact surface 131, the third contact surface 129 or the fifth contact surface 131 can prevent the first limiting protrusion 105 from continuing to rotate relative to the second limiting protrusion 106 and the third limiting protrusion 107, that is, prevent the second limiting protrusion 106 and the third limiting protrusion 107 from continuing to rotate relative to the first limiting protrusion 105.

[0066] In this embodiment, when the top surface of the first limiting protrusion 105 rotates relative to and contacts the second contact surface 128, the second contact surface 128 provides a hovering friction force for the first limiting protrusion 105. When the first rotating shaft 101 rotates, the third contact surface 129 and the fifth contact surface 131 provide a rotation stop for the first rotating shaft 101. When the first limiting protrusion 105 rotates toward the third contact surface 131, the first limiting protrusion 105 abuts against the fourth contact surface 130, and the fourth contact surface 130 provides a self-locking force for the first rotating shaft 101.

[0067] In some embodiments, the included angle between the first contact surface 127 and the third contact surface 129 is greater than or equal to 90°; the included angle between the second contact surface 128 and the fifth contact surface 131 is greater than or equal to 90°; and the third contact surface 129, the fourth contact surface 130 and the fifth contact surface 131 are all curved surface structures. When the rotation of the first rotating shaft 101 and the rotation of the second rotating shaft 102 are limited, the fitting effect of the first limiting protrusion 105 abutting against the second limiting protrusion 106 and the third limiting protrusion 107 is better; or the fitting effect of the third limiting protrusion 107 abutting against the first limiting protrusion 105 and the second limiting protrusion 106 is better.

[0068] In some embodiments, the first rotating shaft 101 and the second rotating shaft 102 both pass through the first fixed base 113, and the sixth limiting protrusion 110 is provided on the rotation trajectory line of the fourth limiting protrusion 108 and the fifth limiting protrusion 109, and the sixth limiting protrusion 110 is connected to the first fixed base 113; or, the fifth limiting protrusion 109 and the sixth limiting protrusion 110 are both provided on the rotation trajectory line of the fourth limiting protrusion 108, and the fifth limiting protrusion 109 and the sixth limiting protrusion 110 are both connected to the first fixed base 113.

[0069] In this embodiment, since the sixth limiting protrusion 110 is fixedly connected to the first fixed base 113, or the fifth limiting protrusion 109 and the sixth limiting protrusion 110 are fixedly connected to the first fixed base 113, the structural tightness and stability of the dual rotating shaft connector 100 are further increased.

[0070] When the first rotating shaft 101 and the second rotating shaft 102 are rotating, the first rotating shaft 101 and / or the second rotating shaft 102 will not drive the first fixed base 113 to rotate.

[0071] In this embodiment, the detailed structural description of the first rotating shaft 101 described in the above embodiments is provided. Since the second rotating shaft 102 has the same structure as the first rotating shaft 101, that is, both the fifth limiting protrusion 109 and the sixth limiting protrusion 110 have a third contact surface 129 and a fifth contact surface 131, and the first fixed base 113 is also sequentially connected with a first contact surface 127, a second contact surface 128, and a fourth contact surface 130. The connection method between the contact surfaces and the limiting protrusions can be found in the above embodiments, and therefore will not be repeated.

[0072] In some embodiments, the dual-shaft connector 100 further includes a second fixed base 114 and a third fixed base 115. The first rotating shaft 101 passes through the second fixed base 114, and a first limiting protrusion 105 is fixedly connected to the second fixed base 114, or the first limiting protrusion 105 and the seventh limiting protrusion 111 are fixedly connected to the second fixed base 114. The second rotating shaft 102 passes through the third fixed base 115, and a fourth limiting protrusion 108 is fixedly connected to the second fixed base 114, or the fourth limiting protrusion 108 and the eighth limiting protrusion 112 are fixedly connected to the third fixed base 115.

[0073] In this embodiment, the first rotating shaft 101 and the second fixed base 114 are fixedly connected, such that when the first rotating shaft 101 rotates, it can drive the second fixed base 114 to rotate, that is, drive the first limiting protrusion 105 to rotate relative to the second limiting protrusion 106 and the third limiting protrusion 107; or drive the first limiting protrusion 105 and the seventh limiting protrusion 111 to rotate relative to the second limiting protrusion 106 and the third limiting protrusion 107. The second rotating shaft 102 and the third fixed base 115 are fixedly connected, such that when the second rotating shaft 102 rotates, it can drive the third fixed base 115 to rotate, thereby driving the fourth limiting protrusion 108 to rotate relative to the fifth limiting protrusion 109 and the sixth limiting protrusion 110; or drive the fourth limiting protrusion 105 and the eighth limiting protrusion 112 to rotate relative to the fifth limiting protrusion 109 and the sixth limiting protrusion 110. The fourth limiting protrusion 108 is fixedly connected to the second fixed base 114, or the fourth limiting protrusion 108 and the eighth limiting protrusion 112 are fixedly connected to the third fixed base 115, which can further increase the structural stability of the dual rotating shaft connector 100.

[0074] Optionally, such as Figure 1 , 3 and Figure 4As shown, the dual-shaft connector 100 also includes a seventh limiting protrusion 111, which is connected to the second end of the first shaft 101. When the first shaft 101 rotates in the first rotation direction, the first limiting protrusion 105 can abut against the second limiting protrusion 106. When the first shaft 101 rotates in the second rotation direction, the seventh limiting protrusion 111 can abut against the third limiting protrusion 107.

[0075] In this embodiment, the rotation angle position of the first rotating shaft 101 is restricted by the seventh limiting protrusion 111 and the first limiting protrusion 105, which can increase the stability of the dual rotating shaft rotation.

[0076] In some embodiments, the dual-shaft connector 100 further includes an eighth limiting protrusion 112, which is connected to the second end of the second shaft 102. When the second shaft 102 rotates in a first rotation direction, the eighth limiting protrusion 112 abuts against the fifth limiting protrusion 109; when the second shaft 102 rotates in a second rotation direction, the eighth limiting protrusion 112 abuts against the sixth limiting protrusion 110. The fifth limiting protrusion 109, the sixth limiting protrusion 110, the seventh limiting protrusion 111, and the eighth limiting protrusion 112 cooperate to jointly limit the rotation angles of the second shaft 102 and the first shaft 101 in different rotation directions. The first limiting protrusion 105, the second limiting protrusion 106, the third limiting protrusion 107, and the fourth limiting protrusion 108 cooperate to jointly limit the rotation angles of the first shaft 101 and the second shaft 102 in different rotation directions. It can be seen that by setting limiting protrusions to restrict the rotation angle of the first rotating shaft 101 and the second rotating shaft 102 respectively, the overall stability of the dual rotating shaft connector 100 can be improved.

[0077] In some embodiments, the fixed connection structure formed by the second limiting protrusion 106, the third limiting protrusion 107, and the first fixed base 113, and the fixed connection structure formed by the fifth limiting protrusion 109, the sixth limiting protrusion 110, and the first fixed base 113, are symmetrically arranged. This facilitates synchronous rotation between the first rotating shaft 101 and the second rotating shaft 102, and allows for joint control of the rotation angle of the two rotating shafts.

[0078] In some embodiments, the eighth limiting protrusion 112 and the fourth limiting protrusion 108 are both connected to the third fixed base 115 to facilitate assembly.

[0079] Optionally, such as Figure 1As shown, the dual-shaft connector 100 also includes a first spring 116, a second spring 117, a first connecting sleeve 118, a second connecting sleeve 119, and a fourth limiting protrusion 108. The first spring 116 and the first connecting sleeve 118 are sequentially sleeved on the second end of the first shaft 101, and the first spring 116 is sandwiched between the first connecting sleeve 118 and the first limiting protrusion 105.

[0080] The fourth limiting protrusion 108 is connected to the second end of the second rotating shaft 102. The second spring 117 and the second connecting sleeve 119 are sequentially sleeved on the second end of the second rotating shaft 102, and the second spring 117 is sandwiched between the second connecting sleeve 119 and the fourth limiting protrusion 108.

[0081] In this embodiment, the first spring 116 is disposed between the first limiting protrusion 105 and the first connecting sleeve 118, and the second spring 117 is sandwiched between the second connecting sleeve 119 and the fourth limiting protrusion 108. When a compressive force is applied in the first direction to the first connecting sleeve 118 relative to the first rotating shaft 101, or to the second connecting sleeve 119 relative to the second rotating shaft 102, the first connecting sleeve 118 will transmit the compressive force to the first spring 116, and at the same time, the second connecting sleeve 119 will also transmit the compressive force to the second spring 117. Since the first spring 116 and the second spring 117 are elastic, the first spring 116 and the second spring 117 are compressed to generate elastic force.

[0082] Since the limiting methods of the limiting elements of the dual-shaft connector 100 are the same, the above embodiment only uses some of the limiting elements of the dual-shaft connector 100 as examples. The limiting elements of other parts of the dual-shaft connector 100 will not be described in detail here.

[0083] Optionally, such as Figure 1 and Figure 5 As shown, the first connecting sleeve 118 is provided with a first sliding groove 120 and a first fixed boss 122, and the second end of the first rotating shaft 101 is provided with a first sliding protrusion 132, which is located in the first sliding groove 120. The first spring 116 is sandwiched between the first fixed boss 122 and the first limiting protrusion 105. The second connecting sleeve 119 is provided with a second sliding groove 121 and a second fixed boss 123, and the second end of the second rotating shaft 102 is provided with a second sliding protrusion 133, which is located in the second sliding groove 121. The second spring 117 is sandwiched between the second fixed boss 123 and the second limiting protrusion 106.

[0084] In this embodiment, the first sliding groove 120 has an elongated hole along the length of the first connecting sleeve 118. One end of the first spring 116 is connected to the first fixed boss 122, and the other end of the first spring 116 is connected to the first limiting protrusion 105. When the first fixed boss 122 presses the first spring 116 in the first direction, the first sliding protrusion 132 slides relative to the first sliding groove 120 in the second direction, thereby shortening the overall length of the first rotating shaft 101 and the first connecting sleeve 118 in the first direction. The principle of the overall length change of the second rotating shaft 102 and the second connecting sleeve 119 in the first direction is similar and will not be described again here.

[0085] In some embodiments, a stepped surface 124 is provided on the second end of the first rotating shaft 101, and one end of the first connecting sleeve 118 can abut against the stepped surface 124.

[0086] In this embodiment, a stepped surface 124 is provided on the first rotating shaft 101, which can further control the overall minimum length of the first rotating shaft 101 and the first connecting sleeve 118 in the first direction.

[0087] In some embodiments, a stepped surface 124 is also provided on the second end of the second rotating shaft 102, and one end of the second connecting sleeve 119 can abut against the stepped surface 124.

[0088] In this embodiment, a stepped surface 124 is provided on the second rotating shaft 102, which can further control the overall minimum length of the second rotating shaft 102 and the second connecting sleeve 119 in the first direction.

[0089] Optionally, such as Figure 1 and Figure 6 As shown, the dual-shaft connector 100 also includes a housing 125 and a movable base 126. The movable base 126, the first spring 116, and the second spring 117 are all located inside the housing 125. The first connecting sleeve 118 passes through the movable base 126, and the movable base 126 is located between the inner wall of the housing 125 and the first spring 116. And / or, the second connecting sleeve 119 passes through the movable base 126, and the movable base 126 is located between the inner wall of the housing 125 and the second spring 117.

[0090] In this embodiment, all of the above-mentioned structures are housed inside the housing 125 to prevent them from being exposed and easily damaged over time, thus extending the service life of the dual-shaft connector 100. Additionally, the housing 125 also serves as a conduit for wiring (such as FPC cables), reducing wire wear; and the concealed wiring contributes to an aesthetically pleasing appearance.

[0091] In this embodiment, the movable base 126 can fix the first rotating shaft 101 and the second rotating shaft 102 along the first direction, which can prevent the first rotating shaft 101 and the second rotating shaft 102 from flipping during rotation.

[0092] If only the movable base 126 is connected to the first connecting sleeve 118, when an external force is applied to make the first connecting sleeve 118 move relative to the first rotating shaft 101 and the housing 125 in the first direction, the movable base 126 can be driven to move relative to the housing 125 and the first rotating shaft 101 in the first direction. Since the first spring 116 abuts against the movable base 126, the first spring 116 will be continuously squeezed during the movement, causing the first spring 116 to generate an elastic restoring force. When the external force is stopped, the elastic restoring force generated by the first spring 116 will cause the movable base 126 to drive the first connecting sleeve 118 to move relative to the first rotating shaft 101 and the housing 125 in the opposite direction to the first direction, and cause the movable base 126 to abut against the inner wall of the housing 125, which is beneficial to improving the overall stability of the structure.

[0093] If only the movable base 126 is connected to the first connecting sleeve 118, when an external force is applied to make the second connecting sleeve 119 move relative to the second rotating shaft 102 and the housing 125 in the first direction, the movable base 126 can be driven to move relative to the housing 125 and the second rotating shaft 102 in the first direction. Since the second spring 117 abuts against the movable base 126, the second spring 117 will be continuously squeezed during the movement, so that the second spring 117 generates an elastic restoring force. When the external force is stopped, the elastic restoring force generated by the second spring 117 will cause the movable base 126 to drive the second connecting sleeve 119 to move relative to the second rotating shaft 102 and the housing 125 in the opposite direction to the first direction, and make the movable base 126 abut against the inner wall of the housing 125, which is beneficial to improving the overall stability of the structure.

[0094] In this embodiment, if the movable base 126 is connected to both the first connecting sleeve 118 and the second connecting sleeve 119, the movable base 126 can synchronize the movement of the first connecting sleeve 118 and the second connecting sleeve 119. When an external force is applied to make the first connecting sleeve 118 move relative to the first rotating shaft 101 and the housing 125 in the first direction, it can drive the movable base 126 to move relative to the first rotating shaft 101 and the housing 125 in the first direction. The movable base 126 then drives the second connecting sleeve 119 to move relative to the second rotating shaft 102 and the housing 125 in the first direction.

[0095] In some embodiments, the housing 125 is further provided with a movable base 126, one end of which abuts against the first gear 103 and the second gear 104, and the other end of which abuts against the inner wall surface of the housing 125, to further increase the tightness of the dual-shaft connector 100.

[0096] In some embodiments, the first fixed base 113 may be disposed on the inner wall of the housing 125, thereby increasing the tightness and stability of the dual-shaft connector 100.

[0097] In some embodiments, the third limiting protrusion 107 may be provided on the inner wall of the housing 125. This increases the stability of the first limiting protrusion 105 and the second limiting protrusion 106 when rotating relative to the third limiting protrusion 107. Alternatively, it increases the stability of the first limiting protrusion 105 and the seventh limiting protrusion 111 when rotating relative to the second limiting protrusion 106 and the third limiting protrusion 107.

[0098] In some embodiments, the housing 125 can be disassembled along the height direction. Specifically, the housing 125 may include a first housing 1251 and a second housing 1252 that are detachably connected. The detachable connection of the housing 125 facilitates assembly.

[0099] Example 2

[0100] like Figure 7 and Figure 8 As shown, this embodiment provides a pair of eyeglasses, including the dual-axis connector 100 as in Example 1, as well as temples 200 and frames 300. The dual-axis connector 100 is disposed at the connection position between the frames 300 and the temples 200. Both the temples 200 and the frames 300 have mounting cavities for mounting the dual-axis connector 100, and the temples 200 are connected to the frames 300 through the dual-axis connector 100.

[0101] In this embodiment, by adjusting the position of the first connecting sleeve 118 relative to the first rotating shaft 101 and the position of the second connecting sleeve 119 relative to the second rotating shaft 102, the first connecting sleeve 118 can be installed in the mounting cavity at one end of the temple 200, the first rotating shaft 101 can be installed in the mounting cavity at the other end of the temple 200, the second connecting sleeve 119 can be installed in the mounting cavity at one end of the frame 300, and the second rotating shaft 102 can be installed in the mounting cavity at the other end of the frame 300, thereby achieving the connection between the temple 200 and the frame 300; or, by adjusting the positions of the first connecting sleeve 118 and the second connecting sleeve 119, the first connecting sleeve 118 can be installed in the mounting cavity at one end of the frame 300, the first rotating shaft 101 can be installed in the mounting cavity at the other end of the frame 300, the second connecting sleeve 119 can be installed in the mounting cavity at one end of the temple 200, and the second rotating shaft 102 can be installed in the mounting cavity at the other end of the temple 200, thereby achieving the connection between the temple 200 and the frame 300.

[0102] In this embodiment, when the dual-axis connector 100 is installed in the mounting cavity of the temple 200 and the frame 300 by adjusting the positions of the first connecting sleeve 118 and the second connecting sleeve 119, the first spring 116 and the second spring 117 will be compressed and generate an elastic restoring force toward the mounting cavity. After the elastic restoring force is transmitted to the first connecting sleeve 118 and the second connecting sleeve 119, the dual-axis connector 100 can be stably installed on the connection part of the temple 200 and the frame 300.

[0103] The dual-axis connector 100 in this embodiment adopts a compressed installation configuration, which makes the eyeglasses of this embodiment easy to assemble, thereby improving assembly efficiency. The dual-axis connector 100 in this embodiment connects to the temples 200 and the frame 300 at both the top and bottom ends, which can shorten the width of the dual-axis connector 100.

[0104] The eyeglasses in this embodiment can adjust the angle between the temples 200 and the frame 300 according to the user's head circumference.

[0105] The above embodiments merely illustrate specific implementation methods of this application, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of protection of this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the technical solution of this application, and these all fall within the scope of protection of this application.

Claims

1. A dual-rotary union connector, characterized by, The double-rotation shaft connector comprises a first rotation shaft, a second rotation shaft, a first gear, a second gear, a first limiting protrusion, a second limiting protrusion and a third limiting protrusion. The first rotation shaft and the second rotation shaft are arranged along a first direction, and along the first direction, a first end of the first rotation shaft is connected with the first gear, and a second end of the first rotation shaft is connected with the first limiting protrusion; a first end of the second rotation shaft is connected with the second gear; the first gear and the second gear are meshed and connected in the outer circumferential surface; The third limiting protrusion is arranged on a rotation track line of the first limiting protrusion; when the first rotation shaft rotates along a first rotation direction, the first limiting protrusion is driven to rotate until the first limiting protrusion abuts against the third limiting protrusion, and the rotation of the first rotation shaft and the second rotation shaft is prevented; The second limiting protrusion is arranged on the second end of the first rotation shaft, and the third limiting protrusion is arranged on a rotation track line of the second limiting protrusion; when the first rotation shaft rotates along a second rotation direction opposite to the first rotation direction, the second limiting protrusion is driven to rotate until the second limiting protrusion abuts against the third limiting protrusion, and the rotation of the first rotation shaft and the second rotation shaft is prevented; or, the second limiting protrusion is arranged on a rotation track line of the first limiting protrusion; when the first rotation shaft rotates along the second rotation direction, the first limiting protrusion is driven to rotate until the first limiting protrusion abuts against the second limiting protrusion, and the rotation of the first rotation shaft and the second rotation shaft is prevented; The double-rotation shaft connector further comprises a first fixed base, the first fixed base has a first contact surface, a fourth contact surface and a second contact surface connected in sequence, the first rotation shaft passes through the first fixed base, based on the fact that the second limiting protrusion and the third limiting protrusion are arranged on the rotation track line of the first limiting protrusion, the second limiting protrusion and the third limiting protrusion are connected on the first fixed base, the third limiting protrusion and the second limiting protrusion each have a third contact surface and a fifth contact surface; when the first limiting protrusion rotates relative to the second limiting protrusion and the third limiting protrusion, the surface of the first limiting protrusion can be in contact with the third contact surface, the first contact surface, the fourth contact surface, the second contact surface and the fifth contact surface in sequence; or, the surface of the first limiting protrusion can be in contact with the fifth contact surface, the second contact surface, the fourth contact surface, the first contact surface and the third contact surface in sequence; when the surface of the first limiting protrusion is in contact with the third contact surface or the fifth contact surface, the third contact surface or the fifth contact surface can prevent the first limiting protrusion from continuing to rotate relative to the second limiting protrusion and the third limiting protrusion; The third contact surface, the fourth contact surface and the fifth contact surface are curved surface structures. When the top surface of the first limiting protrusion rotates relative to the second contact surface and contacts the second contact surface, the second contact surface provides hovering friction for the first limiting protrusion; when the first rotating shaft rotates, the third contact surface and the fifth contact surface provide rotation stop for the first rotating shaft; when the first limiting protrusion rotates towards the third contact surface, the first limiting protrusion is attached to the fourth contact surface, and the fourth contact surface provides self-locking force for the first rotating shaft; The double-rotating-shaft connector further comprises a first spring, a second spring, a first connecting sleeve, a second connecting sleeve and a fourth limiting protrusion, wherein the first spring and the first connecting sleeve are sleeved on the second end of the first rotating shaft, and the first spring is clamped between the first connecting sleeve and the first limiting protrusion; The fourth limiting protrusion is connected to the second end of the second rotating shaft, the second spring and the second connecting sleeve are sleeved on the second end of the second rotating shaft, and the second spring is clamped between the second connecting sleeve and the fourth limiting protrusion.

2. A dual swivel coupling as claimed in claim 1, characterised in that, Further comprising a fourth limiting protrusion, a fifth limiting protrusion and a sixth limiting protrusion, wherein: The fourth limiting protrusion is connected to the second end of the second rotating shaft, the sixth limiting protrusion is arranged on the rotation track line of the fourth limiting protrusion, when the second rotating shaft rotates in the first rotating direction, the fourth limiting protrusion is driven to rotate until the fourth limiting protrusion abuts against the sixth limiting protrusion and prevents the second rotating shaft and the first rotating shaft from rotating; The fifth limiting protrusion is arranged on the second end of the second rotating shaft, the sixth limiting protrusion is arranged on the rotation track line of the fifth limiting protrusion, when the second rotating shaft rotates in the second rotating direction, the fifth limiting protrusion is driven to rotate until the fifth limiting protrusion abuts against the sixth limiting protrusion and prevents the second rotating shaft and the first rotating shaft from rotating; or, the fifth limiting protrusion is arranged on the rotation track line of the second rotating shaft, when the second rotating shaft rotates in the second rotating direction, the second rotating shaft is driven to rotate until the fourth limiting protrusion abuts against the fifth limiting protrusion and prevents the second rotating shaft and the first rotating shaft from rotating.

3. A dual-rotating shaft coupling as defined in claim 2 wherein, The first rotating shaft and the second rotating shaft pass through the first fixed base, based on the sixth limiting protrusion being arranged on the rotation track line of the fourth limiting protrusion, the sixth limiting protrusion is connected to the first fixed base; or, based on the fifth limiting protrusion and the sixth limiting protrusion being arranged on the rotation track line of the fourth limiting protrusion, the fifth limiting protrusion and the sixth limiting protrusion are both connected to the first fixed base.

4. A dual-rotating shaft coupling as claimed in claim 2 or claim 3, wherein, The double-rotating-shaft connector further comprises a seventh limiting protrusion, the seventh limiting protrusion is connected to the second end of the first rotating shaft; when the first rotating shaft rotates in the first rotating direction, the first limiting protrusion abuts against the second limiting protrusion; when the first rotating shaft rotates in the second rotating direction, the seventh limiting protrusion abuts against the third limiting protrusion.

5. A dual-rotating shaft coupling as defined in claim 1, wherein, The first connecting sleeve is provided with a first sliding groove and a first fixing boss, the second end of the first rotating shaft is provided with a first sliding boss, the first sliding boss is located in the first sliding groove, and the first spring clamp is arranged between the first fixing boss and the first limiting boss.

6. A dual-rotating shaft coupling as claimed in claim 5, wherein, The second end of the first rotating shaft is provided with a step surface, and one end of the first connecting sleeve is abuttable against the step surface.

7. A dual-rotating shaft coupling as defined in claim 1 wherein, The double-rotating-shaft connecting piece further comprises a shell and a movable base, the movable base, the first spring and the second spring are located in the interior of the shell, the first connecting sleeve passes through the movable base, and the movable base is located between the inner wall of the shell and the first spring, and / or the second connecting sleeve passes through the movable base, and the movable base is located between the inner wall of the shell and the second spring. 8.An eyeglass comprising the double-rotating-shaft connecting piece according to any one of claims 1-7, and a temple and a frame, the double-rotating-shaft connecting piece being arranged at a connecting position of the frame and the temple.

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