First connector, connection assembly and connection system

Abstract

The present invention discloses a first connector, a connection assembly and a connection system. The first connector includes a first connector body. A connection boss is protruding from one end of the first connector body, and a mounting part is provided at the other end. The mounting part is for locking into a first mounting hole of a first member. An operating part is fixedly provided between the connection boss and the mounting part of the first connector body. There is a relative distance between the operating part and the connection boss to form a connection groove. The operating part is used to rotate at least a part of the first connector body by being driven by an external tool. Wherein, the outer wall of the operating part has at least one operating plane, operating hole, operating convex point, operating groove, or a cross section that matches the cross section of the sleeve. After the furniture product is connected using the connection assembly of the present invention, the stealth of the furniture product can be improved.

Description

[Technical Field]

[0001] The present invention relates to a first connector, which is used for two-in-one, three-in-one, and four-in-one furniture hardware connectors. The present invention also relates to a connection assembly and connection system, which is used for connecting a first member and a second member, particularly for connecting members of furniture. [Background technology]

[0002] As people's aesthetic sense improves, stealth connectors are increasingly being used between two furniture panels to enhance the aesthetics of furniture and fixtures. Among these, stealth connectors, such as two-in-one connectors, three-in-one connectors, and four-in-one connectors, are widely used to connect two furniture panels. As shown in Figures 1 to 3, a conventional three-in-one connector mainly consists of an insert nut 10, a connecting rod 20, and an eccentric wheel 30. In use, the insert nut 10 is embedded in the first mounting hole 61' of the first member 6'. The eccentric wheel 30 is attached to the second mounting hole 71' of the second member 7', and the first end of the connecting rod 20 is firmly connected to the first member 6' through the insert nut 10. The insert nut 10 functions as a reinforcement. The second end of the connecting rod 20 is inserted into the second member 7' and firmly connected to the eccentric wheel 30. This achieves a stealth connection between the first member 6' and the second member 7' using the three-in-one connector. In addition, the three-in-one connector is highly detachable, and the first member 6' and the second member 7' can be disassembled and assembled by multiple disassembly and assembly steps.

[0003] The connecting rod 20 is generally made of metal or metal with plastic. The second end of the connecting rod 20 is provided with a round head 201 for connection to the eccentric wheel 30. In conventional technology, the round head 201 of the connecting rod 20 is provided with a slot, cross slot, or hexagonal slot to allow the first end of the connecting rod 20 to rotate within the insert nut 10 and ensure a secure connection. The round head 201 of the connecting rod 20 is rotated within the insert nut 10 by using a screwdriver or hex wrench. In accordance with current common usage practices, the diameter and height of the round head 201 of the connecting rod 20 are designed to be large to allow multiple rotations. However, this requires the diameter of the existing zinc alloy eccentric wheel 30 to be larger than 12 mm (usually 15 mm). As a result, the diameter of the second mounting hole 71' of the second member 7' is large, making it easy for the user to see the eccentric wheel 30 through the large diameter of the second mounting hole 71', reducing the stealthiness of the three-in-one connector and affecting the aesthetic appearance of the furniture. Similarly, two-in-one connectors and four-in-one connectors also have the problem of the large diameter of the round head 201 of the connecting rod 20. As a result, the diameter of the second member 7' is large, reducing the stealthiness of the two-in-one connector and four-in-one connector and affecting the aesthetic appearance of the furniture. Summary of the Invention

[0004] To solve the technical problem of low stealth of furniture when using existing two-in-one, three-in-one, or four-in-one connectors, a first aspect of the present invention provides a first connector. The first connector is used in combination with a second connector to connect a first member to a second member. Alternatively, the first connector is used in combination with a third connector and a threaded fastener to connect a first member to a second member. The first connector includes a first connector body, with a protruding connection boss formed on one end of the first connector body and a mounting portion formed on the other end. The mounting portion is adapted to lock into a first mounting hole of the first member. The first connector body has an operating portion fixedly disposed between the connection boss and the mounting portion. There is a relative gap between the operating portion and the connection boss to form a connecting groove. The operating portion is driven by an external tool to rotate at least a portion of the first connector body.

[0005] The outer wall of the operating part has at least one operating plane, operating hole, operating protrusion, operating groove, or a cross section that matches the cross section of the sleeve.

[0006] In some implementations, the cross section of the operating portion is square, hexagonal, oval, elliptical, or petal-shaped.

[0007] In some implementations, the cross-sectional area of ​​the handling portion is greater than the cross-sectional area of ​​the connection boss.

[0008] In some implementations, the cross section of the connection boss is circular and the diameter of the connection boss is 3 to 5.3 mm.

[0009] In some implementations, the connecting groove is circumferentially arranged along the outer sidewall of the body of the first connector and has the shape of an annular groove.

[0010] In some implementations, the mounting portion includes a first rotating portion that is fixedly connected to the body of the first connector, and the first rotating portion has an outer peripheral sidewall with an external thread, or the distance between both ends of the first rotating portion along a first predetermined linear direction is greater than the distance between both ends along a second predetermined linear direction along a lateral line of sight of the first rotating portion.

[0011] When the operating part is driven to rotate by an external tool, the first rotating part rotates a certain angle within the first mounting hole of the first member and then locks onto the inner wall of the first mounting hole.

[0012] In some implementations, the body, connection boss, operating portion, and first rotating portion of the first connector are a single piece made of metal.

[0013] In some implementations, the body of the first connector has a first restriction boss protruding between the first rotating portion and the operating portion.

[0014] In some implementations, the cross-sectional area of ​​the operating portion is greater than the cross-sectional area of ​​the first rotating portion.

[0015] In some implementations, the mounting portion includes a first expandable body and a second rotating portion fixedly connected to the body of the first connector, the second rotating portion being rotatably mounted within the first expandable body, and at least one first fastening boss being provided on an outer wall of the first expandable body.

[0016] A male thread is provided on a side wall of the outer periphery of the second rotating part, or the distance between both ends of the second rotating part along the third predetermined linear direction along the horizontal line of sight of the second rotating part is greater than the distance between both ends along the fourth predetermined linear direction.

[0017] When the operating part is driven to rotate by an external tool, the second rotating part rotates through a certain angle within the first expansion body, causing at least one of the first fastening bosses to expand radially outward along the first expansion body, and lock onto the inner wall of the first mounting hole of the first member.

[0018] In some implementations, the first clamping boss is located at one end of the first inflatable body, and the safety tube fits onto the other end of the first inflatable body.

[0019] In some implementations, the outer peripheral sidewall of the first inflatable body is provided with a second limiting boss that is adjacent to the first fastening boss.

[0020] In some implementations, when the outer peripheral sidewall of the second rotating part is provided with a male thread, the first expansion body is provided with a female mounting thread for mating with the connection to the second rotating part.

[0021] The diameter of the bottom of the female mounting thread gradually decreases along the direction in which the second rotating part is inserted into the first expansion body.

[0022] In some implementations, a deformation gap communicating with the interior of the first expansion body is provided at the position of the first fastening boss in the first expansion body.

[0023] In some implementations, the body of the first connector is provided with a hinge portion between the connection boss and the mounting portion, and the connection boss and the mounting portion rotate relative to each other by the hinge portion.

[0024] Based on the first technical solution above, a first connector of the present invention has the following advantages over existing technologies:

[0025] The body of the first connector has an operating portion fixedly disposed between the connection boss and the mounting portion. When the operating portion is driven to rotate by an external tool, it rotates at least a portion of the body of the first connector. That is, at least a portion of the mounting portion rotates simultaneously with the operating portion, and at least a portion of the mounting portion locks into the first mounting hole of the first member, thereby connecting the first connector to the first member. The operation is simple and convenient, and assembly efficiency can be improved.

[0026] The first connector of the present invention has an operating part fixedly mounted between the connecting boss and the mounting part. This allows the diameter of the connecting boss to be reduced, the diameter of the second connector (i.e., the eccentric wheel of the existing technology) to be reduced, and the diameter of the second mounting hole of the second component to be further reduced. This makes it difficult for users to see the second connector through the second mounting hole, improving the stealth of the second connector on the second component and further improving the aesthetics of the furniture product. Furthermore, the provision of an operating part on the first connector of the present invention allows an external tool to apply a larger force surface area to the operating part and more stably apply force, compared to existing technologies that provide slots, cross slots, or hexagonal slots on the connecting boss. This improves the reliability of disassembly and assembly of the first connector on the first component, prolongs its service life, and increases economic efficiency.

[0027] A second aspect of the present invention provides a first connector. The first connector is used in combination with a second connector to connect a first member and a second member. Alternatively, the first connector is used in combination with a third connector and a threaded fastener to connect a first member and a second member. The first connector includes a first connector body, with a protruding connection boss formed at one end of the first connector body and a mounting portion formed at the other end. The mounting portion is for locking into a first mounting hole of the first member. The first connector body has a driving male thread portion fixedly disposed between the connection boss and the mounting portion. The driving male thread portion engages with an operating portion having an internal thread. There is a relative gap between the operating portion and the connection boss to form a connecting groove. The operating portion is driven by an external tool to rotate at least a portion of the first connector body.

[0028] The outer wall of the operating part has at least one operating plane, operating hole, operating protrusion, operating groove, or a cross section that matches the cross section of the sleeve.

[0029] In some implementations, the cross section of the connection boss is circular and the diameter of the connection boss is 3 to 5.3 mm.

[0030] In some implementations, the attachment portion includes a second expandable body and a tapered portion fixedly connected to the body of the first connector, the second expandable body has a tapered channel therein, the tapered portion is slidably disposed within the tapered channel, and the second expandable body has at least one second fastening boss disposed on an outer wall thereof.

[0031] When the operating part is rotated by an external tool, the tapered part slides a certain distance into the tapered channel, causing the at least one second fastening boss to expand radially outward along the second expansion body, and the at least one second fastening boss to lock onto the inner wall of the first mounting hole of the first member.

[0032] In some implementations, a restrictive cavity is formed within the second expandable body, and the body of the first connector is provided with a restrictive surround between the tapered portion and the male drive threads, the restrictive surround being slidably disposed within the restrictive cavity.

[0033] When the operating part is driven to rotate by an external tool, the tapered part slides a certain distance into the tapered channel, and the limiting surround abuts against one end of the limiting cavity to limit the sliding of the tapered part. The at least one second fastening boss expands outward along the radial direction of the second expansion body, and the at least one second fastening boss locks against the inner wall of the first mounting hole of the first member.

[0034] In some implementations, the outer peripheral sidewall of the second inflatable body is provided with a third limiting boss that is adjacent to the second fastening boss.

[0035] In some implementations, the cross-sectional area of ​​the female thread of the operating portion is greater than the cross-sectional area of ​​the connection boss.

[0036] In some implementations, the body of the first connector is provided with a hinge portion between the connection boss and the mounting portion, and the connection boss and the mounting portion rotate relative to each other by the hinge portion.

[0037] Based on the second technical solution, the first connector of the present invention has the following advantages over the existing technology:

[0038] The body of the first connector has a male drive screw portion fixedly disposed between the connection boss and the mounting portion. The male drive screw portion engages with an operating portion having a female thread to form a connection. When the operating portion is driven and rotated by an external tool, the rotated operating portion linearly slides the male drive screw portion, thereby linearly sliding at least a portion of the body of the first connector. That is, after at least a portion of the mounting portion slides linearly, at least a portion of the mounting portion locks into the first mounting hole of the first member, thereby connecting the first connector to the first member. The operation is simple and convenient, and assembly efficiency can be improved.

[0039] The first connector of the present invention rotates at least a portion of the body of the first connector by fixedly providing a male screw thread and an operating part between the connecting boss and the mounting part. This allows the diameter of the connecting boss to be reduced, the diameter of the second connector (i.e., the eccentric wheel of the existing technology), and the diameter of the second mounting hole of the second component to be made smaller. This makes it difficult for users to see the second connector through the second mounting hole, improving the stealth of the second connector on the second component and further improving the aesthetics of the furniture product. Furthermore, by providing a male screw thread and an operating part on the first connector of the present invention, the force area of ​​the operating part for an external tool is larger and the force is more stable than in the existing technology of providing a slot, cross slot, or hexagonal slot on the connecting boss. This improves the reliability of disassembly and assembly of the first connector on the first component, prolongs its service life, and increases economic efficiency.

[0040] Furthermore, a third aspect of the present invention provides a connection assembly, which includes a second connector attached to a second member and the first connector according to the first and second aspects of the present invention.

[0041] The second connector is rotatable between an unlocked position and a locked position. A slot is provided in a side wall of the second connector, and a clamp arm is provided on at least one inner wall of the slot. When the second connector is in the unlocked position, the connection boss and the connection groove are inserted into the slot through the slot opening. When the second connector is in the locked position, the clamp arm prevents the connection boss from being pulled out of the slot.

[0042] In some implementations, the second connector is provided with a drive for rotating the second connector.

[0043] In some implementations, the cross section of the driver matches the cross section of the sleeve.

[0044] In some implementations, when the cross-section of the operating portion matches the cross-section of the sleeve, the cross-sectional shape and area of ​​the drive portion are the same as the cross-sectional shape and area of ​​the operating portion.

[0045] In some implementations, the second connector is an eccentric ring structure, and the diameter of the second connector is 6 to 11.5 mm.

[0046] In addition, a fourth aspect of the present invention provides a connection assembly, which includes a third connector for insertion into a second member, a threaded fastener, and the first connector of the first and second aspects of the present invention.

[0047] The third connector has a connecting channel on its outer wall, a connecting hole at its top communicating with the connecting channel, and at least a portion of the connecting groove is inserted into the connecting hole at a position where the connecting channel communicates with the connecting hole. The threaded fastener is threadedly connected to the connecting hole, and one end of the threaded fastener is inserted into the connecting groove.

[0048] In some embodiments, the third connector has a cylindrical structure, the connecting channel has two ends passing through opposite sides of the third connector, the connecting hole is provided at one end of the third connector, and the diameter of the third connector is 10 mm or less.

[0049] Additionally, a fifth aspect of the present invention provides a connection system, which includes a first member, a second member, and the connection assembly of the third aspect of the present invention.

[0050] The first member has a first mounting hole, the mounting part is inserted into the first mounting hole, and when the operating part rotates a certain angle, the mounting part locks onto the inner wall of the first mounting hole.

[0051] The second member has a bottom with a second mounting hole and a sidewall with a mounting channel communicating with the second mounting hole. The second connector is rotatably mounted in the second mounting hole. When the second connector is in the unlocked position, the connecting boss and connecting groove are inserted into the slot of the second connector through the mounting channel, and the operating portion is in the mounting channel. When the second connector is in the locked position, the clamp arm prevents the connecting boss from being pulled out of the slot.

[0052] In some implementations, the attachment channel includes a first stage subchannel and a second stage subchannel that communicate with each other, the cross-sectional area of ​​the first stage subchannel matches the cross-sectional area of ​​the connection boss, and the cross-sectional area of ​​the second stage subchannel matches the cross-sectional area of ​​the operating portion.

[0053] In some implementations, a decorative cover is also included, the decorative cover being inserted into the second mounting hole to cover the opening of the second mounting hole.

[0054] Additionally, a sixth aspect of the present invention provides a connection system, which includes a first member, a second member, and the connection assembly of the fourth aspect of the present invention.

[0055] The first member has a first mounting hole, the mounting part is inserted into the first mounting hole, and when the operating part rotates a certain angle, the mounting part locks with the inner wall of the first mounting hole.

[0056] The second member has a bottom with a second mounting hole and a sidewall with a mounting channel communicating with the second mounting hole. The third connector is inserted into the second mounting hole to connect the connecting channel and the mounting channel. At least a portion of the connecting groove is inserted through the mounting channel to a position where the connecting channel communicates with the connecting hole, and the operating portion is located within the mounting channel. The threaded fastener is threadedly connected to the connecting hole, and one end of the threaded fastener is inserted into the connecting groove.

[0057] In some implementations, the attachment channel includes a first stage subchannel and a second stage subchannel that communicate with each other, the cross-sectional area of ​​the first stage subchannel matches the cross-sectional area of ​​the connection boss, and the cross-sectional area of ​​the second stage subchannel matches the cross-sectional area of ​​the operating portion.

[0058] In some implementations, a decorative cover is also included, the decorative cover being inserted into the second mounting hole to cover the opening of the second mounting hole. [Brief explanation of the drawings]

[0059] [Figure 1] FIG. 1 is a diagram showing the structure of a three-in-one connector in existing technology. [Figure 2] FIG. 2 is a diagram showing an exploded view of a first member, a second member, and a three-in-one connector according to existing technology. [Figure 3] FIG. 3 is a diagram showing a first structure of the first connector in the first embodiment of the present invention. [Figure 4] FIG. 4 is a diagram showing a second structure of the first connector according to the first embodiment of the present invention. [Figure 5] FIG. 5 is a diagram showing a third structure of the first connector according to the first embodiment of the present invention. [Figure 6] FIG. 6 is a diagram showing a fourth structure of the first connector according to the first embodiment of the present invention. [Figure 7] FIG. 7 is a diagram showing a fifth structure of the first connector according to the first embodiment of the present invention. [Figure 8]FIG. 8 is a diagram illustrating a sixth structure of the first connector according to the first embodiment of the present invention. [Figure 9] FIG. 9 is a diagram illustrating a seventh structure of the first connector according to the first embodiment of the present invention. [Figure 10] FIG. 10 is a diagram illustrating an eighth structure of the first connector according to the first embodiment of the present invention. [Figure 11] FIG. 11 shows the structure of FIG. 10 from another perspective. [Figure 12] FIG. 12 is a diagram illustrating a ninth structure of the first connector according to the first embodiment of the present invention. [Figure 13] FIG. 13 is a diagram illustrating a tenth structure of the first connector according to the first embodiment of the present invention. [Figure 14] FIG. 14 is a view from another perspective in which the first inflatable body of FIG. 13 is omitted. [Figure 15] FIG. 15 is a diagram illustrating an eleventh structure of the first connector according to the first embodiment of the present invention. [Figure 16] FIG. 16 is a diagram showing an exploded view of the structure of FIG. [Figure 17] FIG. 17 is a diagram illustrating a twelfth structure of the first connector according to the first embodiment of the present invention. [Figure 18] FIG. 18 is a diagram illustrating a thirteenth structure of the first connector according to the first embodiment of the present invention. [Figure 19] 19 is a diagram showing the connection of a connection assembly consisting of one of the first connector and the second connector in the first embodiment of the present invention, with the second connector in the released position. [Figure 20] 20 is a diagram showing the connection of a connection assembly consisting of one of the first connector and the second connector in the first embodiment of the present invention, with the second connector in the locked position. [Figure 21] FIG. 21 is a diagram showing an exploded state of the connection system according to the first embodiment of the present invention. [Figure 22] FIG. 22 is a cross-sectional view showing a connection state of the connection system in the first embodiment of the present invention. [Figure 23]FIG. 23 is a diagram showing one structure of the first connector in the second embodiment of the present invention. [Figure 24] FIG. 24 is a cross-sectional view taken along line AA in FIG. [Figure 25] FIG. 25 is a diagram showing an exploded view of the structure of FIG. [Figure 26] FIG. 26 is a diagram showing another structure of the first connector in the second embodiment of the present invention. [Figure 27] FIG. 27 is a diagram showing another structure of the first connector in the second embodiment of the present invention. [Figure 28] FIG. 28 is a cross-sectional view showing a connection state of the connection system according to the second embodiment of the present invention. [Figure 29] FIG. 29 is a diagram of a connection assembly consisting of one of the first and third connectors and a threaded fastener in the third embodiment of the present invention. [Figure 30] FIG. 30 is a diagram showing the structure of a third connector and a threaded fastener according to a third embodiment of the present invention. [Figure 31] FIG. 31 is a diagram showing an exploded state of the connection system according to the third embodiment of the present invention. [Figure 32] FIG. 32 is a cross-sectional view showing a connection state of a connection system according to a third embodiment of the present invention. [Figure 33] FIG. 33 is another cross-sectional view showing the connection state of the connection system according to the third embodiment of the present invention. [Figure 34] FIG. 34 is a cross-sectional view of a second member of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0060] Specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but do not limit the scope of the present invention.

[0061] In describing the present invention, orientations and positional relationships indicated by terms such as "center," "length," "width," "thickness," "top," "bottom," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," "clockwise," "counterclockwise," and the like, are based on the accompanying drawings. These are intended solely for the purpose of conveniently describing the present invention and simplifying the description. They do not imply that the devices or elements referred to must have a particular orientation, be assembled in a particular orientation, or be operated in a particular orientation. Therefore, they should not be understood as limitations of the present invention.

[0062] Additionally, the terms "first" and "second" are used for descriptive purposes only and do not imply a relative importance or the number of technical features shown. As such, features defined as "first" and "second" explicitly or implicitly include one or more of such features. In the description of the present invention, "plurality" means two or more than two unless expressly and specifically limited.

[0063] In the present invention, unless expressly and specifically limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense. For example, it can mean fixed connection, detachable connection, or integration. It can mean mechanical connection or electrical connection. It can mean direct connection, connection through an intermediary, internal connection of two elements, or interaction of two elements. Those skilled in the art will understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0064] In the present invention, unless expressly and specifically limited, a first feature being "above" or "below" a second feature may include direct contact between the first and second features, or may include contact between the first and second features through another feature between them without direct contact. A first feature being "above," "upper," or "on the upper surface" of a second feature includes indicating that the first feature is directly above and diagonally above the second feature, or that the first feature is horizontally higher than the second feature. A first feature being "below," "below," or "on the lower surface" of a second feature includes indicating that the first feature is directly below and diagonally below the second feature, or that the first feature is horizontally lower than the second feature.

[0065] In existing technology, as shown in Figures 1 and 2, a three-in-one connector consists of an insert nut 10, a connecting rod 20, and an eccentric wheel 30. It is primarily used to achieve a stealth connection between two furniture panels. One furniture panel is designated as a first member 6', and the other furniture panel is designated as a second member 7'. The first member 6' and the second member 7' may have the same or different shapes or materials. The shapes may be, for example, plate-like, block-like, or column-like. The materials may be wood, plastic, metal, polymer composites, or an assembly of these materials. This list is not intended to be limiting.

[0066] When using a three-in-one connector, a first mounting hole 61' is provided in the first member 6' and a second mounting hole 71' is provided in the second member 7'. An insert nut 10 is embedded in the first mounting hole 61' of the first member 6'. An eccentric 30 is mounted in the second mounting hole 71' of the second member 7'. The first end of the connecting rod 20 is firmly connected to the first member 6' through the insert nut 10. The insert nut 10 functions as a reinforcement. The second end of the connecting rod 20 is inserted into the second member 7' and firmly connected to the eccentric 30. This allows the first member 6' and the second member 7' to be connected stealthily using the three-in-one connector. In addition, two-in-one and four-in-one connectors also exist in existing technology. The two-in-one connector consists of a connecting rod 20 and an eccentric 30. In use, the first end of the connecting rod 20 is directly installed in the first mounting hole 61' of the first member 6', and the second end of the connecting rod 20 is inserted into the second member 7' to firmly connect to the eccentric 30. This eliminates the need for the insert nut 10 in the two-in-one connector compared to the three-in-one connector, resulting in a more stable connection. Regarding the connection method of the four-in-one connector, please refer to existing techniques in this field, which will not be described here.

[0067] Whether it is a three-in-one connector or a two-in-one connector, the second end of the existing connecting rod 20 is provided with a round head 201 for connecting with the eccentric wheel 30. The round head 201 is provided with a slot, cross slot, or hexagonal slot (usually a cross slot). A screwdriver is used to act on the cross slot and rotate the round head 201, locking the first end of the connecting rod 20 into the insert nut 10 or the first mounting hole 61' of the first member 6'. Because the connecting rod 20 is long, the diameter of the connecting rod 20 must usually be large to ensure that the first end of the connecting rod 20 can rotate into the insert nut 10 or the first mounting hole 61' of the first member 6'. Therefore, the cross slot of the round head 201 is sufficiently large and deep. This ensures that the force of the screwdriver acting on the round head 201 is sufficient to stabilize the rotation of the connecting rod 20. In addition, the round head 201 with a large diameter ensures repeated operation of the screwdriver, so that the connecting rod 20 of the first member 6' can be disassembled and assembled multiple times.

[0068] Because the diameter of the round head 201 is large, the diameter of the eccentric 30, which is made of a zinc alloy and is connected to the round head 201, must be larger than 12 mm. As a result, the diameter of the second mounting hole 71' in the second member 7' is large, and the large diameter of the second mounting hole 71' affects the aesthetic appearance of the second member 7'. At the same time, after the first member 6' is connected to the second member 7', the user can easily see the eccentric 30 through the second mounting hole 71', which reduces the stealthiness of existing three-in-one connectors or two-in-one connectors and affects the aesthetic appearance of the furniture.

[0069] In addition, when a four-in-one connector is used between the first member 6' and the second member 7', the diameter of the second mounting hole 71' is large, which affects the aesthetics of the second member 7' and the furniture.

[0070] Example 1 To address the technical problem of low stealth when connecting two furniture panels using two-in-one or three-in-one connectors in the existing technology, a connection assembly is disclosed in Example 1 of the present invention. As shown in Figures 19 to 22, the connection assembly includes a first connector 1 and a second connector 2. In use, first connector 1 is firmly connected to first member 6, second connector 2 is installed in second mounting hole 71 of second member 7, and one end of first connector 1 is inserted into second member 7 to firmly connect to second connector 2. This achieves a stealth connection between first member 6 and second member 7 through first connector 1 and second connector 2. The structure of second connector 2 in Example 1 of the present invention is similar to the structure of eccentric wheel 30 in the existing technology, except that the diameter of second connector 2 is much smaller than the diameter of eccentric wheel 30 in the prior art. This reduces the diameter of second mounting hole 71, improving the aesthetic appearance of second member 7. At the same time, it becomes difficult for the user to see the second connector 2 through the second mounting hole 71, which has a small diameter, and the aesthetic appearance of the furniture is further improved.

[0071] The specific structure of the first connector 1 of the first embodiment will be further described below.

[0072] As shown in FIGS. 3 to 18 , the first connector 1 according to the first embodiment of the present invention includes a first connector body. A connection boss 11 is formed to protrude from one end of the first connector body, and an attachment portion 12 is provided at the other end. The attachment portion 12 is for locking into the first attachment hole 61 of the first member 6. An operating portion 13 is fixedly provided between the connection boss 11 and the attachment portion 12 on the first connector body. There is a relative gap between the operating portion 13 and the connection boss 11 to form a connection groove 14. The operating portion 13 is driven by an external tool to rotate at least a portion of the first connector body. The outer wall of the operating portion 13 has at least one operating plane, operating hole, operating protrusion, or operating groove, or has a cross section that matches the cross section of the sleeve.

[0073] It should be understood that the operating part 13 cannot rotate relative to the first connector body. When the operating part 13 is driven to rotate by an external tool, it rotates at least a portion of the first connector body. The operating part 13 can be integrally formed with the first connector body. For example, the operating part 13 and the first connector body can be a single piece made of metal or plastic. Alternatively, the operating part 13 can be fastened, wrapped, or bonded between the connecting boss 11 and the mounting part 12 of the first connector body by an interference fit so as to be fixed to the first connector body. For example, the operating part 13 can be a plastic part, and the first connector body can be a metal part. The cross section of the operating part 13 can be designed to be non-circular, or the operating part 13 can be designed to have a non-cylindrical structure. For example, as shown in FIGS. 3 to 5, the side wall of the operating part 13 has at least one operating plane. The number of operating planes can be one, two, four, six, etc. The operating part 13 can be clamped and rotated using a vise or other external tools such as pliers or a wrench. For example, the side wall of the operating part 13 may have an operating hole, and an external tool such as a screwdriver, metal rod, or hexagonal wrench may be inserted into the operating hole to rotate the operating part 13. For example, as shown in FIG. 6, the side wall of the operating part 13 may have an operating protrusion or an operating groove, and an external tool such as a vise or wrench may be used to clamp the operating protrusion or the operating groove to rotate the operating part 13. As another example, as shown in FIGS. 3, 4, and 7 to 20, when the cross section of the operating part 13 matches the cross section of the sleeve, the external tool for rotating the operating part 13 is a socket wrench. Socket wrenches are commonly used in this field. For example, they may be manual socket wrenches according to the national standard GB T 3390.1-2004, or manual socket wrenches or electric wrenches according to other national standards. The cross section of the sleeve may be polygonal, such as triangular, rectangular, hexagonal, or octagonal, or non-circular, including but not limited to elliptical, rounded, or petal-shaped. As a result, when the sleeve is rotated using a socket wrench, the operating portion 13 can be rotated simultaneously with the sleeve, causing at least a portion of the mounting portion 12 of the first connector 1 to rotate and be firmly connected to the first member 6.

[0074] Based on the above solution, an operating portion 13 is provided on the body of the first connector. An operator uses an external tool to act on the operating portion 13 to connect the mounting portion 12 to the first member 6. The force area during operation is large and the force is stable. This improves the efficiency of installing the first connector 1 on the first member 6 and the stability of disassembly and assembly. Furthermore, providing the operating portion 13 on the body of the first connector reduces the diameter of the second connector 2 and the diameter of the second mounting hole 71 in the second member 7, thereby improving the aesthetic appearance of the second member 7. It is difficult for users to see the second connector through the small diameter of the second mounting hole 71, improving the stealth of the second connector 2 on the second member 7 and improving the aesthetic appearance of the furniture product.

[0075] Furthermore, the body of the first connector is detachably connected to the second connector 2 in this embodiment 1 through the connection boss 11. The cross section of the connection boss 11 may be circular, elliptical, rectangular, hexagonal, irregular, etc. The first embodiment of the present invention does not limit the specific shape of the connection boss 11. Typically, the cross section of the connection boss 11 is preferably circular, and the connection groove 14 is an annular groove circumferentially surrounded along the outer side wall of the body of the first connector. After the first connector 1 is fixedly connected to the first member 6, the worker can insert the connection boss 11 into the second connector 2 without having to determine the installation direction of the first connector 1, which improves assembly convenience.

[0076] Furthermore, in some implementations of this embodiment, when the cross section of the connection boss 11 is circular, the diameter of the connection boss 11 is 3 to 5.3 mm. For example, 3 mm, 3.5 mm, 4.0 mm, 4.2 mm, 4.5 mm, 5 mm, 5.3 mm, etc. This design ensures that the diameter of the second connector 2 is 12 mm or less, which is much smaller than the diameter of the eccentric wheel 30 in the existing technology. This improves the stealth of the second connector 2 in the second member 7 and enhances the aesthetics of the furniture.

[0077] Furthermore, if the diameter of the connection boss 11 of the first connector in this embodiment is between 4.2 mm and 5.3 mm, those skilled in the art can machine a slot, cross slot, or hexagonal slot on the end surface of the connection boss 11. After inserting a screwdriver or wrench into the slot, cross slot, or hexagonal slot and rotating the body of the first connector, the slot, cross slot, or hexagonal slot will wear out and be difficult to reuse. Alternatively, if the diameter of the connection boss 11 of the first connector in this embodiment is between 4.2 mm and 5.3 mm, it is difficult to directly attach the first connector 1 to the first member 6 using a manual or electric flathead screwdriver, Phillips screwdriver, or hexagonal screwdriver. Therefore, to rotate the body of the first connector again, the operating part 13 must be rotated. The operating part 13 is required to attach the first connector 1 to the first member 6. The end surface of the connection boss 11 may be provided with a slot, cross slot, or hexagonal slot. This is within the scope of protection of the present invention. If the diameter of the connection boss 11 of the first connector in this embodiment is 3 mm to 4.2 mm, it is difficult to machine a slot, cross slot, or hexagonal slot on the end surface of the connection boss 11. In this case, rotating the body of the first connector depends entirely on the operating part 13. In this case, the diameter of the second connector 2 cooperating with the first connector 1 becomes smaller. The hole diameter of the second mounting hole 71 of the second member 7 can be reduced to improve stealth performance.

[0078] Correspondingly, the diameter of the annular groove-shaped connecting groove 14 of the body of the first connector is smaller than the diameter of the connecting boss 11. That is, the diameter of the connecting groove 14 of the body of the first connector in the first embodiment of the present invention is 1.8 to 4 mm, for example, 1.8 mm, 2.0 mm, 2.5 mm, 3.0 mm, 3.5 mm, 4 mm, etc.

[0079] Furthermore, in some implementations of this embodiment 1, the cross-sectional area of ​​the operating part 13 is larger than that of the connection boss 11 to improve stability when the external tool rotates the operating part 13 to rotate the body of the first connector. That is, the diameter of the circumscribed circle formed by the outer contour of the operating part 13 is larger than that of the connection boss 11. This increases the contact area between the operating part 13 and the external tool, improving the stability of assembling the first connector 1 on the first component 6. In addition, when the external tool is a socket wrench, the cross-sectional area of ​​the operating part 13 is larger than that of the connection boss 11, ensuring that the sleeve can fit into the operating part 13 through the connection boss 11 and that the socket wrench can rotate the operating part 13.

[0080] Furthermore, in this embodiment 1, there are two ways to connect the mounting part 12 and the first member 6. First, the mounting part 12 includes a first rotating part 121. In use, the first rotating part 121 is placed directly in the first mounting hole 61 of the first member 6, and the first rotating part 121 rotates simultaneously with the operating part 13 before locking against the inner wall of the first mounting hole 61. Second, the mounting part 12 includes a first expanding body 122 and a second rotating part 123. The second rotating part 123 is disposed within the first expanding body 122 and rotates relative to the first expanding body 122. In use, the first expanding body 122 is disposed in the first mounting hole 61 of the first member 6, and the second rotating part 123 rotates simultaneously with the operating part 13 before expanding the outer wall of the first expanding body 122. As a result, the first fastening boss 122a of the first expanding body 122 locks against the inner wall of the first mounting hole 61.

[0081] The two methods for connecting the mounting portion 12 and the first member 6 will be described in detail below.

[0082] In a first connection method between the mounting part 12 and the first member 6, as shown in FIGS. 3 to 11, the mounting part 12 includes a first rotating part 121. When the operating part 13 is driven and rotated by an external tool, the first rotating part 121 rotates a certain angle into the first mounting hole 61 of the first member 6 and locks onto the inner wall of the first mounting hole 61. There are two methods for locking the first rotating part 121 onto the inner wall of the first mounting hole 61, as follows: First, as shown in FIGS. 3 to 9, the first rotating part 121 is a cylindrical or conical body, and a male thread is provided on the outer circumferential side wall of the first rotating part 121. The outer diameter of the male thread of the first rotating part 121 is larger than the diameter of the first mounting hole 61. As a result, when the first rotating part 121 rotates in a first rotation direction (usually clockwise) into the mounting hole 61, the first rotating part 121 is screwed into the first mounting hole 61 in a self-tapping manner, locking the male threads of the first rotating part 121 against the inner wall of the first mounting hole 61 and fixedly connecting the first connector 1 to the first member 6.

[0083] A second method for locking the first rotating part 121 with the inner wall of the first mounting hole 61 is as shown in FIGS. 10 and 11 . The distance between both ends of the first rotating part 121 along the first predetermined linear direction U is greater than the distance between both ends along the second predetermined linear direction V, as viewed from the horizontal direction of the first rotating part 121. The first predetermined linear direction U and the second predetermined linear direction V form a certain angle, such as 30°, 60°, or 90°, but is not limited thereto. The cross section of the first rotating part 121 can be, for example, elliptical, rounded, rectangular, or diamond-shaped, and the shape and size of the first mounting hole 61 of the first member 6 can be matched to the shape and size of the first rotating part 121. That is, the cross section of the first mounting hole 61 can be, for example, elliptical, rounded, rectangular, or diamond-shaped. The first rotating part 121 is inserted into the first mounting hole 61 by a clearance fit. When the operating part 13 is rotated by a certain angle in the second rotation direction (usually clockwise) using an external tool, the first rotating part 121 also rotates by the same angle into the first mounting hole 61. As a result, both ends of the first rotating part 121 with a larger cross-sectional length move to both ends of the first mounting hole 61 with a smaller cross-sectional length. At this time, the first rotating part 121 and the first mounting hole 61 are tightly fitted together, generating a clamping force between the first rotating part 121 and the inner wall of the first mounting hole 61, which prevents the first rotating part 121 from being pulled out of the first mounting hole 61. To remove the first connector 1 from the first member 6, the operating part 13 is rotated by an external tool in the opposite direction of the second rotation direction (usually counterclockwise).

[0084] Furthermore, to ensure that the first rotating part 121 rotates simultaneously with the operating part 13 and that the entire first connector 1 has high structural strength, the main body of the first connector, the connection boss 11, the operating part 13 and the first rotating part 121 are an integral part made of metal, for example, iron, zinc-plated alloy, stainless steel or the like.

[0085] In another embodiment of this invention, the cross-sectional area of ​​the operating part 13 is larger than that of the first rotating part 121. At the same time, the cross-sectional area of ​​the operating part 13 is larger than that of the first mounting hole 61. As a result, when the first rotating part 121 is fully inserted into the first mounting hole 61 and locked with the inner wall of the first mounting hole 61, the end of the operating part 13 abuts against the surface of the first member 6, and the operating part 13 can be used for positioning the mounting, improving the accuracy and convenience of assembly.

[0086] In a second connection method between the mounting portion 12 and the first member 6, as shown in FIGS. 12 to 16 , the mounting portion 12 includes a first expansion body 122 and a second rotating portion 123. The first expansion body 122 has, for example, a hollow cylindrical structure. The second rotating portion 123 is rotatably disposed inside the first expansion body 122, and at least one first tightening boss 122a is provided on the outer wall of the first expansion body 122. The second rotating portion 123 and the main body of the first connector are integrally formed, so that the second rotating portion 123 rotates simultaneously with the operating portion 13. When the operating portion 13 is driven to rotate by an external tool, the second rotating portion 123 rotates a certain angle within the first expansion body 122. As a result, the at least one first tightening boss 122a is expanded outward in the radial direction of the first expansion body 122, and the at least one first tightening boss 122a is locked against the inner wall of the first mounting hole 61 of the first member 6.

[0087] In this embodiment, the number of first fastening bosses 122a may be one or more. The first fastening boss 122a and the first expansion body 122 are integrally formed. The first fastening boss 122a and the first expansion body 122 may have a certain degree of elasticity, for example, may be made of plastic. Furthermore, the remaining structure of the first expansion body 122 in this embodiment is the same as that of the insert nut 10 in the existing technology, and therefore will not be described here.

[0088] Furthermore, in some implementations of this Example 1, as shown in Figures 15 and 16, the first expansion body 122 is composed of multiple subassemblies. To prevent the first expansion body 122 from disintegrating during use, a first fastening boss 122a is provided at one end of the first expansion body 122, and a safety tube 16 is provided at the other end of the first expansion body 122. The diameter of the safety tube 16 is larger than the diameter of the operating part 13. The safety tube 16 surrounds the multiple subassemblies to ensure the stability of the connection of the first expansion body 122.

[0089] Furthermore, there are two ways for the second rotating part 123 to expand the first fastening boss 122a outward along the radial direction of the first expansion body 122. First, as shown in Figures 12, 15, and 16, the second rotating part 123 is cylindrical or conical, and a male thread is provided on the outer circumferential side wall of the second rotating part 123. A female mounting thread 122b is provided in the first expansion body 122 to connect to the second rotating part 123. The bottom diameter of the female mounting thread 122b gradually decreases along the direction in which the second rotating part 123 is inserted into the first expansion body 122. When the second rotating part 123 rotates inside the first expansion body 122, it can expand the first expansion body 122 outward.

[0090] In a second method, the second rotating part 123 expands the first fastening boss 122a radially outward from the first expanding body 122. As shown in FIGS. 13 and 14 , the distance between both ends of the second rotating part 123 along the third predetermined linear direction X is greater than the distance between both ends along the fourth predetermined linear direction Y, as viewed from the lateral direction of the second rotating part 123. The third predetermined linear direction X and the fourth predetermined linear direction Y form a certain angle, such as 30°, 60°, or 90°, but this is not limited thereto. The cross section of the second rotating part 123 is, for example, elliptical, rounded, rectangular, or diamond-shaped, and the shape and size of the hollow portion inside the first expanding body 122 are matched to the shape and size of the second rotating part 123. That is, the cross section of the hollow portion inside the first expanding body 122 is, for example, elliptical, rounded, rectangular, or diamond-shaped. The second rotating part 123 is inserted into the first expanding body 122 by a loose fit. When the operating part 13 is rotated by a certain angle in the fourth rotation direction (usually clockwise) using an external tool, the second rotating part 123 also rotates by the same angle inside the first expansion body 122. As a result, the two ends of the second rotating part 123 with a larger cross-sectional length move to the two ends of the first expansion body 122 with a smaller cross-sectional length, respectively. At this time, the second rotating part 123 is tightly fitted into the inside of the first expansion body 122, causing the second rotating part 123 to expand the side wall of the first expansion body 122 outward along its radial direction. As a result, the at least one first tightening boss 122a expands and abuts against the inner wall of the first mounting hole 61, increasing the sliding friction of the first expansion body 122 inside the first mounting hole 61 and restricting the mounting part 12 from being pulled out of the first mounting hole 61, thereby achieving a secure connection between the first connector 1 and the first component 6. When the first connector 1 is to be removed from the first member 6, the operating portion 13 may be rotated in the direction opposite to the fourth rotation direction (usually counterclockwise) using an external tool.

[0091] Furthermore, the body of the first connector has a rigid structure in which the connection boss 11 and the mounting portion 12 are integrated, and the center line of the connection boss 11 and the center line of the mounting portion 12 are on the same straight line. In this case, the first connector 1 is generally suitable for cases in which the connection surfaces of the first member 6 and the second member 7 are vertical or horizontal, respectively, and has a large load capacity.

[0092] In some implementations, when the connecting and bonding surfaces of the first and second components 6 and 7 are both sloped, as shown in FIGS. 17, 18, and 22, the first connector body has a hinge 111 between the connecting boss 11 and the mounting portion 12, allowing the connecting boss 11 and the mounting portion 12 to rotate relative to each other via the hinge 111. This allows the connecting boss 11 and the mounting portion 12 to form a certain included angle. The included angle may be, for example, 10°, 30°, 65°, 100°, 150°, or 180°. Specifically, the included angle between the connecting boss 11 and the mounting portion 12 is adjusted according to the connecting surfaces of the first and second components 6 and 7. This allows the mounting portion 12 to be fixedly connected to the connecting surface of the first component 6, while the connecting boss 11 and the connecting groove 14 can be connected to the second connector 2 on the connecting surface of the second component 7. Finally, the connecting surface of the first component 6 adheres to the connecting surface of the second component 7, achieving a stealth connection.

[0093] In the first embodiment of the present invention, the operating portion 13 is closer to the connecting boss 11 than the hinge portion 111. Therefore, the mounting portion 12, the hinge portion 111, the operating portion 13, the connecting groove 14, and the connecting boss 11 are sequentially disposed on the main body of the first connector.

[0094] Furthermore, the hinge portion 111 in the first embodiment of the present invention may be a pivot, a hinge ball, or a universal joint. Specifically, as shown in FIG. 17 , the main body of the first connector has a separation structure between the connection boss 11 and the mounting portion 12. That is, the main body of the first connector is separated into a first segment and a second segment. The connection boss 11 is located in the first segment, and the mounting portion 12 is located in the second segment. If the hinge portion 111 is a pivot, a pivot hole is provided in each of the first segment and the second segment. By passing a pin shaft or a cylindrical structure as the pivot through the pivot holes of the first segment and the second segment in sequence, the first segment and the second segment can rotate relative to each other around the pivot, and the connection boss 11 and the mounting portion 12 can rotate relative to each other. If the hinge portion 111 is a universal joint, as shown in FIG. 18 , if the universal joint is, for example, a cross shaft, the first segment and the second segment each have a shaft hole. The shaft hole of the first segment is fitted onto the first rotation axis of the cross shaft, and the shaft hole of the second segment is fitted onto the second rotation axis of the cross shaft, so that the first segment and the second segment can rotate relatively around the cross shaft, and the connecting boss 11 and the mounting part 12 can also rotate relatively. Because the angle adjustment is more flexible and the assembly is more convenient, the connecting assembly in Example 1 of the present invention is suitable for a stealth connection when the connecting surfaces of two furniture panels are sloped, and can improve the aesthetic appearance of the furniture product.

[0095] Furthermore, based on the structure of the first connector 1 according to the first embodiment of the present invention, the specific structure of the second connector 2 that is adapted to connect to the first connector 1 in the first embodiment will be described below.

[0096] As shown in FIGS. 19 and 20 , the second connector 2 may have a cylindrical, conical, or spherical structure. The bottom (or top) of the second member 7 is provided with a second mounting hole 71 for receiving the second connector 2, and the second connector 2 is rotatably mounted within the second mounting hole 71 by a clearance fit. This allows the second connector 2 to be directly connected to the second member 7, while allowing the second connector 2 to rotate in a rotational direction between the unlocked position and the locked position. A slot 21 is provided on a side wall of the second connector 2, and a clamp arm 22 is provided on at least one inner wall of the slot 21. When the second connector 2 is in the unlocked position, the connection boss 11 and the connection groove 14 are inserted into the slot 21 through the opening of the slot 21. When the second connector 2 is in the locked position, the clamp arm 22 prevents the connection boss 11 from being pulled out of the slot 21.

[0097] As shown in FIG. 34 , to achieve a stealth connection between the first member 6 and the second member 7, the second connector 2 is completely installed within the second mounting hole 71. To this end, a mounting channel 72 connecting to the second mounting hole 71 is provided on the side wall of the second member 7. The connecting boss 11 and the connecting groove 14 are inserted into the slot 21 of the second connector 2 through the mounting channel 72. At this time, part of the body and the operating portion 13 of the first connector 2 are also inserted into the mounting channel 72, and part of the first connector 1 is hidden within the second member 7. At this time, the surface of the first member 6 adheres to the surface of the second member 7, achieving a stealth connection. It is difficult for the user to see the first connector 1 and the second connector 2 through the outside of the first member 6 or the second member 7.

[0098] Furthermore, the clamp arms 22 in the first embodiment of the present invention are provided along the edge of the opening of the slot 21, and the number of clamp arms 22 may be one or two. Usually, when there are two clamp arms 22, the two clamp arms are respectively provided on two opposite inner sides of the slot 21. The two clamp arms 22 are provided in the connecting groove 14, thereby preventing the connecting boss 11 from being pulled out of the slot 21.

[0099] In some implementations of the first embodiment, the second connector 2 is made of metal, such as iron, steel, or zinc-plated alloy, which provides high structural strength and meets heavy load requirements.

[0100] To rotate the second connector 2 between the unlocked position and the locked position, an actuator 23 for rotating the second connector 2 is provided at the end of the second connector 2. The actuator 23 may have a groove structure or a protrusion structure. In some implementations, as shown in FIGS. 19 and 20, the actuator 23 has a groove structure such as a slot, a cross slot, or an internal hexagonal slot. The actuator 23 having a groove structure ensures that the second connector 2 is fully mounted in the second mounting holes 71, achieving stealth. Then, a tool is inserted into the actuator 23 to rotate the second connector 2 into the second mounting holes 71.

[0101] Furthermore, the second connector 2 in the first embodiment of the present invention has an eccentric ring structure. That is, the slot 21 has an eccentric ring structure. When the second connector 2 is in the unlocked position, the connection boss 11 and the connection groove 14 are inserted into the slot 21 at a deep position. When the second connector 2 is in the locked position, the connection boss 11 is inserted into the slot 21 at a shallow position. As a result, the clamp arm 22 is clamped in the connection groove 14. At this time, the clamp arm 22 abuts against the connection boss 11 to prevent the connection boss 11 from being pulled out of the slot 21. The diameter of the connection boss 11 of the first connector 1 in the first embodiment of the present invention is 3 to 5.3 mm. The diameter of the second connector 2 in the first embodiment of the present invention is 6 to 11.5 mm. For example, it may be 6 mm, 7 mm, 8.5 mm, 10 mm, or 11.5 mm. As a result, the diameter of the second connector 2 in Example 1 of the present invention is much smaller than the diameter of the eccentric wheel in existing technology, and the hole diameter of the second mounting hole 71 is small, which improves the stealth of the second connector 2 in the second member 7.

[0102] Based on the structure of the connection assembly in the first embodiment of the present invention, a stealth connection between the first member 6 and the second member 7 can be achieved through the connection assembly in the first embodiment of the present invention to form a connection system. As shown in FIGS. 21 and 22 , the connection system includes a first member 6, a second member 7, a first connector 1, and a second connector 2. The first member 6 has a first mounting hole 61, and the mounting part 12 is inserted into the first mounting hole 61. When the operating part 13 is rotated by a certain angle, the mounting part 12 locks against the inner wall of the first mounting hole 61. The second member 7 has a second mounting hole 71 at its bottom, and a mounting channel 72 communicating with the second mounting hole 71 is formed in its side wall. The second connector 2 is rotatably mounted in the second mounting hole 71. When the second connector 2 is in the unlocked position, the connecting boss 11 and the connecting groove 14 are inserted into the slot 21 of the second connector 2 through the mounting channel 72, and the operating part 13 is in the mounting channel 72. When the second connector 2 is in the locked position, the clamp arm 22 restricts the connection boss 11 from being pulled out of the slot 21, and the first member 6 and the second member 7 are connected stealthily through the first connector 1 and the second connector 2.

[0103] Regarding the specific method of attaching the first connector 1 and the first member 6 of the connection system in the first embodiment of the present invention, and the specific method of attaching the second connector 2 and the second member 7, please refer to the above explanations and will not be described here.

[0104] 34 , in some implementations of the present embodiment 1, the mounting channel 72 includes a first-stage sub-channel 721 and a second-stage sub-channel 722 that communicate with each other. The cross-sectional area of ​​the first-stage sub-channel 721 matches the cross-sectional area of ​​the connection boss 11, and the cross-sectional area of ​​the second-stage sub-channel 722 matches the cross-sectional area of ​​the operating portion 13. When the cross-sectional area of ​​the operating portion 13 is larger than the cross-sectional area of ​​the connection boss 11, the mounting channel 72 becomes a variable-diameter flow path, and the portion of the mounting channel 72 closer to the second mounting hole 71 (i.e., the cross-sectional area of ​​the first-stage sub-channel 721) is smaller than the portion of the mounting channel 72 closer to the opening (i.e., the cross-sectional area of ​​the second-stage sub-channel 722). This allows the first connector 1 to be inserted more snugly into the mounting channel 72, increasing the load-bearing capacity of the second member 7 and enhancing the rigidity of the connection between the first member 6 and the second member 7.

[0105] Example 2 In response to the technical problem of low stealth when connecting two furniture panels using two-in-one or three-in-one connectors in the existing technology, a first connector 1 is disclosed in Example 2 of the present invention, as shown in Figures 23 to 28. This first connector 1 cooperates with the second connector 2 in Example 1 to form a connection assembly. A first member 6 and a second member 7 realize a stealth connection through the connection assembly in Example 2 of the present invention. The structure of the first connector 1 in Example 2 of the present invention is different from the structure of the first connector 1 in Example 1. The difference is that the first connector 1 in Example 2 includes a first connector body, and at least a portion of the first connector body slides under an external force, thereby firmly connecting the mounting portion 12 of the first connector body to the first member 6, and the first connector 1 is attached to the first member 6.

[0106] Specifically, the specific structure of the first connector 1 in the second embodiment will be described in detail below.

[0107] As shown in FIGS. 23 to 27 , the first connector 1 in Example 2 includes a first connector body. A connection boss 11 is formed protruding from one end of the first connector body, and an attachment portion 12 is provided at the other end. The attachment portion 12 is for locking into the first attachment hole 61 of the first member 6. A driving male screw portion 17 is fixedly provided between the connection boss 11 and the attachment portion 12 in the first connector body. The driving male screw portion 17 mates with an operating portion 13 having an internal thread. There is a relative distance between the operating portion 13 and the connection boss 11 to form a connection groove 14. The operating portion 13 is driven by an external tool to rotate at least a portion of the first connector body. The outer wall of the operating portion 13 has at least one operating plane, operating hole, operating protrusion, or operating groove, or has a cross section that matches the cross section of the sleeve.

[0108] The structure of the connection boss 11 in this Example 2 is exactly the same as that of the connection boss 11 in the above Example 1. For its specific structure and operating principle, please refer to the above Example 1, which will not be described here. For example, if the cross section of the connection boss 11 is circular, the diameter of the connection boss 11 is 3 to 5.3 mm, such as 3 mm, 3.5 mm, 4.0 mm, 4.2 mm, 4.5 mm, 5 mm, 5.3 mm, etc.

[0109] The specific structure of the operating unit 13 in this second embodiment is similar to that of the operating unit 13 in the first embodiment. However, the operating unit 13 in this second embodiment is separable from the body of the first connector. That is, the operating unit 13 can be detached from the body of the first connector. The body of the first connector has a male drive screw 17 fixedly mounted between the connection boss 11 and the mounting portion 12. For example, the male drive screw 17 is integrally formed with the body of the first connector, and the operating unit 13 is fitted onto the male drive screw 17. The female thread of the operating unit 13 engages with the male drive screw 17 to achieve a threaded connection. When the operating unit 13 is driven and rotated by an external tool, the rotational motion of the operating unit 13 is converted into linear motion of the male drive screw using the principle of threaded connection. As a result, at least a portion of the body of the first connector slides linearly.

[0110] Furthermore, the secure connection between the mounting portion 12 and the first mounting hole 61 of the first member 6 will be described in detail.

[0111] As shown in FIGS. 23 to 26 , the mounting portion 12 in this second embodiment includes a second expansion body 124 and a tapered portion 125 fixedly connected to the main body of the first connector. A tapered channel 124a is formed in the second expansion body 124, and the tapered portion 125 is slidably disposed within the tapered channel 124a. The outer wall of the second expansion body 124 is provided with at least one second fastening boss 124b. When the operating unit 13 is driven and rotated by an external tool, the tapered portion 125 slides a certain distance within the tapered channel 124a, causing the at least one second fastening boss 124b to expand radially outward from the second expansion body 124 and lock the at least one second fastening boss 124b against the inner wall of the first mounting hole 61 of the first component 6. It should be noted that the cross-sectional area of ​​one end of the tapered portion 125 is larger than that of the other end. For example, the tapered portion 125 may be a circular truncated or tapered truncated shape, or a non-tapered protrusion. There are no particular limitations on the shape of the tapered portion 125 as long as the tapered portion 125 can slide into the tapered channel 124a and then expand the at least one second fastening boss 124b outward along the radial direction of the second expansion body 124. The tapered portion 125 is preferably truncated, and when the tapered portion 125 is integrally formed at one end of the main body of the first connector, for example, the inner peripheral wall of the tapered channel 124a also has a truncated shape.

[0112] The tapered portion 125 fits snugly into the tapered channel 124a in the second expansion body 124, and the second expansion body 124 is formed by assembling multiple subassemblies. As shown in FIGS. 23 to 25, the second expansion body 124 is formed by assembling two subassemblies with tapered grooves. The second fastening boss 124b and the second expansion body 124 are integrally formed. The second fastening boss 124b and the second expansion body 124 may have a certain degree of elasticity, for example, they may be an integral plastic part. Furthermore, to ensure that the second fastening boss 124b expands outward in the radial direction of the second expansion body 124, a deformation gap communicating with the tapered channel 124a is provided at the position of the second fastening boss 124b on the second expansion body 124. The deformation gap is used to improve the deformation ability of the second expansion body 124.

[0113] When the first connector 1 in the second embodiment of the present invention is attached to the first member 6, the second expansion body 124 is placed in the first mounting hole 61 of the first member 6 by a clearance fit. When the operating part 13 is rotated in the fifth direction (usually clockwise) by an external tool, a part of the body of the first connector is slid linearly through the threaded connection between the female thread of the operating part 13 and the driving male threaded part 17, and the tapered part 125 is slid into the tapered channel 124a. As a result, the end of the tapered part 125 with a larger cross-sectional area gradually slides toward the end of the tapered channel 124a with a smaller cross-sectional area. A tight fit is gradually formed between the tapered portion 125 and the inner peripheral wall of the tapered channel 124a, and the tapered portion 125 abuts against the inner wall of the tapered channel 124a, causing the outer peripheral wall of the second expansion body 124 to expand radially outward, causing the at least one second tightening boss 124b to expand radially outward of the second expansion body 124 and lock against the inner wall of the first mounting hole 61 of the first member 6, thereby achieving a secure connection between the mounting portion 12 and the first mounting hole 61 of the first member 6. To remove the first connector 1 from the first member 6, an external tool is used to rotate the operating portion 13 in the opposite direction to the fifth direction (usually counterclockwise), causing the end of the tapered portion 125 with the larger cross-sectional area to gradually slide toward the end of the tapered channel 124a with the larger cross-sectional area. As a result, a tight fit is gradually formed between the tapered portion 125 and the inner peripheral wall of the tapered channel 124a, the outer peripheral wall of the second expansion body 124 gradually shrinks inward along the radial direction, and the second tightening boss 124b also shrinks inward along the radial direction of the second expansion body 124 and moves away from the inner wall of the first mounting hole 61 of the first member 6. The mounting portion 12 can be easily pulled out of the mounting hole, and the first connector 1 can be separated from the first member 6.

[0114] In some implementations, the cross-sectional area of ​​the female thread of the operating part 13 is larger than the cross-sectional area of ​​the connection boss 11 to improve stability when the external tool rotates the operating part 13 to linearly slide a portion of the body of the first connector. This allows the operating part 13 to be attached to the driving male thread portion 17 through the connection boss 11, improving the efficiency of assembling the first connector 1. Moreover, when the external tool is a socket wrench, the cross-sectional area of ​​the female thread of the operating part 13 is larger than the cross-sectional area of ​​the connection boss 11. This ensures that the sleeve is fitted into the operating part 13 through the connection boss 11 and the socket wrench can rotate the operating part 13.

[0115] Furthermore, in some implementations of this Example 2, as shown in Figure 26, the second expansion body 124 is composed of multiple subassemblies. To prevent the second expansion body 124 from disintegrating during use, a second fastening boss 124b is provided at one end of the second expansion body 124, and a safety tube 110 is provided at the other end of the second expansion body 124. The diameter of the safety tube 110 is larger than the diameter of the driving male thread portion 17. As a result, the safety tube 110 surrounds the multiple subassemblies to ensure the stability of the connection of the second expansion body 124.

[0116] Furthermore, the body of the first connector in the second embodiment has a rigid structure in which the connection boss 11 and the mounting portion 12 are integrated. The center line of the connection boss 11 and the center line of the mounting portion 12 are aligned on the same straight line. In this case, the first connector 1 is generally suitable for cases in which the connection surfaces of the first member 6 and the second member 7 are vertical or horizontal, respectively, and has a large load capacity.

[0117] In some implementations, when the connecting and bonding surfaces of the first and second components 6 and 7 are both sloped, as shown in FIG. 27 , the body of the first connector in this second embodiment has a hinge 111 between the connecting boss 11 and the mounting portion 12, allowing the connecting boss 11 and the mounting portion 12 to rotate relative to each other via the hinge 111. This allows the connecting boss 11 and the mounting portion 12 to form a certain included angle. The included angle can be, for example, 10°, 30°, 65°, 100°, 150°, or 180°. Specifically, the included angle between the connecting boss 11 and the mounting portion 12 is adjusted depending on the connecting surface of the first and second components 6 and 7. This allows the mounting portion 12 to be fixedly connected to the connecting surface of the first component 6, while the connecting boss 11 and the connecting groove 14 can be connected to the second connector 2 on the connecting surface of the second component 7. Finally, the connecting surface of the first component 6 adheres to the connecting surface of the second component 7, achieving a stealth connection.

[0118] In the second embodiment of the present invention, the operating part 13 is closer to the mounting part 12 than the hinge part 111. For the structure and working principle of the hinge part 111 in the second embodiment, please refer to the description of the hinge part 111 in the first embodiment, and it will not be described here.

[0119] Based on the structure of the connection assembly in Example 2 of the present invention, as shown in Figure 28, a stealth connection between the first member 6 and the second member 7 can be achieved through the connection assembly in Example 2 of the present invention to form a connection system. For the connection system consisting of the first connector 1 and the second connector 2 in Example 2, please refer to the description of the connection system in Example 1 above; it will not be described here. Example 3

[0120] In response to the technical problem of low stealth when connecting two furniture panels using four-in-one connectors in existing technology, a connection assembly is disclosed in Example 3 of the present invention. As shown in Figures 29 to 33, the connection assembly includes a third connector 3, a threaded fastener 5, and the first connector 1 in Examples 1 and 2. A connection channel 31 is formed on the outer wall of the third connector 3, and a connecting hole 32 communicating with the connection channel 31 is formed at the top of the third connector 3. At least a portion of the connecting groove 14 is inserted at a position where the connection channel 31 and the connecting hole 32 communicate. The threaded fastener 5 is threaded into the connecting hole 32, and one end of the threaded fastener 5 is inserted into the connecting groove 14. The threaded fastener 5 in Example 3 of the present invention has a male thread on its outer side wall, such as a screw, bolt, or threaded rod in existing technology. The inner wall of the connecting hole 32 has a female thread for connecting the threaded fastener 5. The threaded fastener 5 is rotated into the connecting hole 32 to insert one end of the threaded fastener 5 into the connecting groove 14, and the threaded fastener 5 prevents the end of the first connector 1 having the connecting groove 14 from being pulled out of the connecting channel 31. Thus, the first connector 1 is firmly connected to the third connector 3 and the threaded fastener 5, and the first member 6 is interconnected with the second member 7.

[0121] The present invention does not limit the shapes of the connection boss 11 and the connection groove 14. For example, the connection boss 11 may be circular, rectangular, or other irregular shapes. The connection groove 14 may be annular, rectangular, or V-shaped. In some implementations, as shown in FIG. 29 , the connection boss 11 in this embodiment 3 has a flat rectangular shape, the connection groove 14 has a V-shaped groove, and there are two connection grooves 14. The two connection grooves 14 are symmetrically arranged on both sides of the body of the first connector. Correspondingly, the cross-sectional shape of the connection channel 31 is the same as that of the connection boss 11. This allows the connection boss 11 to be smoothly inserted into the connection channel 31.

[0122] Other structures of the third connector 3 in the third embodiment of the present invention are the same as the pin structures of the four-in-one connector in the existing technology, so they will not be described here.

[0123] Based on the structure of the connection assembly according to the third embodiment of the present invention, a stealth connection between the first member 6 and the second member 7 can be achieved through the connection assembly according to the third embodiment of the present invention to form a connection system. As shown in FIGS. 31 to 33 , the connection system includes a first member 6, a second member 7, a first connector 1, and a third connector 3. The first member 6 has a first mounting hole 61, and the mounting portion is inserted into the first mounting hole 61. When the operating portion is rotated to a certain angle, the mounting portion locks onto the inner wall of the first mounting hole 61. The bottom of the second member 7 has a second mounting hole 71, and the side wall of the second member 7 has a mounting channel 72 communicating with the second mounting hole 71. The third connector 3 is inserted into the second mounting hole 71 to connect the connecting channel 31 to the mounting channel 72. At least a portion of the connecting groove 14 is inserted through the mounting channel 72 to a position where the connecting groove 31 communicates with the connecting hole 32, and the operating portion is located within the mounting channel 72. The threaded fastener 5 is threaded into the connecting hole 32 , and one end of the threaded fastener 5 is inserted into the connecting groove 14 .

[0124] Regarding the method of attaching the first connector 1 to the first member 6 in the third embodiment of the present invention, please refer to the methods of attaching the first connector 1 to the first member 6 in the first and second embodiments, and will not be described here.

[0125] In this description, the terms "one embodiment," "some embodiments," "exemplary embodiment," "example," "particular example," "some examples," and the like mean that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in that embodiment or example. In this description, schematic representations of such terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0126] Although embodiments of the present invention have been described, those skilled in the art can make various changes, modifications, substitutions, and variations to these embodiments without departing from the principles and purpose of the present invention. The scope of the present invention is limited by the claims and their equivalents.

Claims

1. a first connector adapted to be combined with a second connector to effect a connection between a first member and a second member, wherein the second connector is for attachment to the second member and is rotatable between an unlocked position and a locked position, the second connector having a slot in a side wall thereof and at least one inner wall of the slot having a clamp arm; Alternatively, a first connector is used in combination with a third connector and a threaded fastener to connect a first member and a second member, wherein the third connector is for insertion into the second member, and a connecting channel is provided on an outer wall of the third connector, and a connecting hole communicating with the connecting channel is provided on a top portion of the third connector; The first connector includes a first connector body, a connection boss formed to protrude from one end of the first connector body, and an attachment portion provided at the other end, the attachment portion for locking into the first attachment hole of the first member, an operating portion fixedly provided between the connection boss and the attachment portion, a relative gap between the operating portion and the connection boss to form a connection groove, and the operating portion is used to be driven by an external tool to rotate at least a portion of the first connector body, the connecting boss and the connecting groove are adapted to be inserted into a slot of the second connector in a second mounting hole provided at the bottom of the second member through a mounting channel provided at the side wall of the second member, and the connecting boss is adapted to be restricted by the clamp arm from being pulled out of the slot; Alternatively, at least a part of the connection groove is adapted to be inserted through an attachment channel provided in the side wall of the second member at a position where the connection channel of the third connector in the second attachment hole provided in the bottom of the second member communicates with the coupling hole, and one end of a threaded fastener to be threadedly connected to the coupling hole is inserted into the connection groove; The first connector is characterized in that the outer wall of the operating part has at least one operating plane, operating hole, operating protrusion, or operating groove, or has a cross-section that matches the cross-section of the sleeve so that at least a part of the operating part can be rotated by the sleeve.

2. 2. The first connector according to claim 1, wherein the cross section of the operating portion is rectangular, hexagonal, elliptical, rounded, or petal-shaped.

3. 2. The first connector according to claim 1, wherein a cross-sectional area of ​​the operating portion is larger than a cross-sectional area of ​​the connection boss.

4. 2. The first connector according to claim 1, wherein the cross section of the connection boss is circular and the diameter of the connection boss is 3 to 3.5 mm.

5. 2. The first connector of claim 1, wherein the connecting groove is in the form of an annular groove extending circumferentially along an outer sidewall of the body of the first connector.

6. 2. The first connector according to claim 1, wherein the mounting portion includes a first rotating portion fixedly connected to the main body of the first connector, and a male thread is provided on a side wall of an outer periphery of the first rotating portion, or a distance between both ends of the first rotating portion along a first predetermined linear direction along a horizontal line of sight of the first rotating portion is greater than a distance between both ends along a second predetermined linear direction, When the operating part is driven to rotate by an external tool, the first rotating part rotates within the first mounting hole of the first member by a certain angle, and then locks into the inner wall of the first mounting hole.

7. 7. The first connector according to claim 6, wherein a cross-sectional area of ​​the operating portion is larger than a cross-sectional area of ​​the first rotating portion.

8. 2. The first connector according to claim 1, wherein the mounting portion includes a first expansion body and a second rotating portion fixedly connected to the body of the first connector, the second rotating portion being rotatably disposed within the first expansion body, and the first expansion body has at least one first fastening boss on its outer wall; a male thread is provided on a side wall of the outer periphery of the second rotating part, or a distance between both ends of the second rotating part along a third predetermined linear direction along a horizontal line of sight of the second rotating part is greater than a distance between both ends along a fourth predetermined linear direction; When the operating part is driven to rotate by an external tool, the second rotating part rotates within the first expansion body by a certain angle, causing at least one of the first fastening bosses to expand radially outward along the first expansion body, and the at least one of the first fastening bosses to lock onto the inner wall of the first mounting hole of the first member, forming a first connector.

9. 9. The first connector according to claim 8, wherein the first fastening boss is provided at one end of the first inflatable body, and a safety tube is fitted to the other end of the first inflatable body.

10. 2. A first connector according to claim 1, wherein the body of the first connector is provided with a hinge portion between the connection boss and the mounting portion, and the connection boss and the mounting portion rotate relative to each other via the hinge portion.

11. a first connector adapted to be combined with a second connector to effect a connection between a first member and a second member, wherein the second connector is for attachment to the second member and is rotatable between an unlocked position and a locked position, the second connector having a slot in a side wall thereof and at least one inner wall of the slot having a clamp arm; Alternatively, the first connector is used in combination with a third connector and a threaded fastener to connect a first member and a second member, wherein the third connector is for insertion into the second member, and a connecting channel is provided on the outer wall of the third connector, and a connecting hole communicating with the connecting channel is provided on the top of the third connector; The first connector includes a first connector body, one end of which has a protruding connection boss formed thereon and the other end of which has an attachment portion provided thereon, the attachment portion being for locking into a first attachment hole of the first member, the body of the first connector having a drive male screw portion fixedly provided between the connection boss and the attachment portion, the drive male screw portion having an operating portion having a female thread corresponding to the drive male screw portion and connected to the female thread by threaded engagement with the drive male screw portion, there being a relative gap between the operating portion and the connection boss to form a connection groove, the operating portion being driven by an external tool to rotate at least a portion of the body of the first connector, the connecting boss and the connecting groove are adapted to be inserted into a slot of the second connector in a second mounting hole provided at the bottom of the second member through a mounting channel provided at the side wall of the second member, and the connecting boss is adapted to be restricted by the clamp arm from being pulled out of the slot; Alternatively, at least a part of the connection groove is adapted to be inserted through an attachment channel provided in the side wall of the second member at a position where the connection channel of the third connector in the second attachment hole provided in the bottom of the second member communicates with the coupling hole, and one end of a threaded fastener to be threadedly connected to the coupling hole is inserted into the connection groove; the mounting portion includes a second expansion body and a tapered portion fixedly connected to the body of the first connector, a tapered channel formed in the second expansion body, the tapered portion being slidably disposed in the tapered channel, and at least one second fastening boss being disposed on an outer wall of the second expansion body, and when the operating portion is driven to rotate by an external tool, the tapered portion slides a certain distance within the tapered channel, causing the at least one second fastening boss to expand outward along the radial direction of the second expansion body and lock the at least one second fastening boss against the inner wall of the first mounting hole of the first member; The first connector is characterized in that the outer wall of the operating part has at least one operating plane, operating hole, operating protrusion, or operating groove, or has a cross-section that matches the cross-section of the sleeve so that at least a part of the operating part can be rotated by the sleeve.

12. 12. The first connector according to claim 11, wherein the cross section of the connection boss is circular and the diameter of the connection boss is 3 to 5.3 mm.

13. 12. The first connector according to claim 11, wherein the body of the first connector is provided with a hinge portion between the connection boss and the mounting portion, and the connection boss and the mounting portion rotate relative to each other via the hinge portion.

14. A connection assembly comprising a second connector attached to a second member and the first connector of any one of claims 1 to 13, The second connector can rotate between a release position and a lock position, a slot is provided in a side wall of the second connector, and a clamp arm is provided on at least one inner wall of the slot, and when the second connector is in the release position, the connection boss and the connection groove are inserted into the slot from the opening of the slot, and when the second connector is in the lock position, the clamp arm prevents the connection boss from being pulled out of the slot.

15. 15. The connection assembly according to claim 14, wherein the second connector is an eccentric ring structure, i.e., the slot of the second connector is an eccentric structure; When the second connector is in the release position, the connecting boss and connecting groove are inserted into the deep position of the slot, When the second connector is in the locked position, the connection boss is inserted into a shallow position of the slot, whereby the clamp arm is clamped in the connection groove, and at this time, the clamp arm abuts against the connection boss to prevent the connection boss from being pulled out of the slot; A connection assembly, wherein the diameter of the second connector is between 6 and 11.5 mm.

16. A connection assembly comprising a third connector for insertion into a second member, a threaded fastener, and the first connector of any one of claims 1 to 13; A connection assembly in which a connection channel is provided on the outer wall of the third connector, a connecting hole communicating with the connection channel is provided on the top of the third connector, at least a portion of the connecting groove is inserted at a position where the connection channel and the connecting hole communicate, a threaded fastener is threadedly connected to the connecting hole, and one end of the threaded fastener is inserted into the connection groove.

17. 16. A connection system comprising: a first member; a second member; and the connection assembly of claim 15; a first mounting hole is provided on the first member, the mounting part is inserted into the first mounting hole, and when the operating part is rotated by a certain angle, the mounting part is locked to the inner wall of the first mounting hole; a second mounting hole is provided on the bottom of the second member, a mounting channel communicating with the second mounting hole is provided on the side wall of the second member, a second connector is rotatably provided in the second mounting hole, when the second connector is in the release position, the connection boss and the connection groove are inserted into the slot of the second connector through the mounting channel, and when the second connector is in the lock position, the operating part is in the mounting channel, and the clamp arm prevents the connection boss from being pulled out of the slot,

18. 18. The connection system of claim 17, wherein the attachment channel includes a first stage subchannel and a second stage subchannel that are interconnected, the cross-sectional area of ​​the first stage subchannel being matched to the cross-sectional area of ​​the connection boss, and the cross-sectional area of ​​the second stage subchannel being matched to the cross-sectional area of ​​the operating portion.

19. 17. A connection system comprising: a first member; a second member; and the connection assembly of claim 16; a first mounting hole is provided on the first member, the mounting part is inserted into the first mounting hole, and when the operating part is rotated by a certain angle, the mounting part is locked to the inner wall of the first mounting hole; A second mounting hole is provided on the bottom of the second member, a mounting channel communicating with the second mounting hole is provided on the side wall of the second member, a third connector is inserted into the second mounting hole to connect the connecting channel to the mounting channel, at least a portion of the connecting groove is inserted through the mounting channel to a position where the connecting channel and the connecting hole communicate, an operating part is in the mounting channel, a threaded fastener is threadedly connected to the connecting hole, and one end of the threaded fastener is inserted into the connecting groove.

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