CN216199580U

CN216199580U - Hidden connecting piece for furniture

Info

Publication number: CN216199580U
Application number: CN202122898480.6U
Authority: CN
Inventors: 李江
Original assignee: Yangqu Yixin Home Furnishing Factory
Current assignee: Yangqu Yixin Home Furnishing Factory
Priority date: 2021-11-24
Filing date: 2021-11-24
Publication date: 2022-04-05
Anticipated expiration: 2031-11-24

Abstract

The utility model provides a hidden connecting piece for furniture, which comprises: the embedded bushing assembly comprises a screw assembly body and an embedded bushing assembly, wherein the screw assembly body is inserted and clamped in the embedded bushing assembly, the screw assembly comprises a first clamping connector and a second clamping connector, a first inner cavity and a second inner cavity are arranged in the embedded bushing assembly, the first clamping connector is clamped in the first inner cavity, and the second clamping connector is clamped in the second inner cavity. According to the embedded bushing assembly, the first clamping joint is clamped in the first inner cavity, the second clamping joint is clamped in the second inner cavity, the screw assembly and the embedded bushing assembly are connected more stably under the action of the first clamping joint and the second clamping joint, the screw assembly is not easy to fall out of the embedded bushing assembly, the connection between the two plates is more reliable and stable, the overall service life of furniture is prolonged, and the screw assembly and the embedded bushing assembly are installed in a hidden mode, so that the overall attractiveness of the furniture is improved.

Description

Hidden connecting piece for furniture

Technical Field

The utility model relates to the technical field of furniture, in particular to a hidden connecting piece for furniture.

Background

People have not only been limited to the function at furniture itself to the demand of furniture now, and more the aesthetic property of paying attention to furniture promotes the living body experiment, and furniture is made for panel mostly, and panel passes through the connection constitution furniture of hardware, and the relatively common hardware connecting piece connects for screw, countersunk head bolt and expansion bolts etc. in the furniture trade.

The patent of current grant number for "CN 203770333U" discloses a two unification connecting pieces of furniture, the connecting piece comprises worker's shape nail and expansion pipe, the one end of worker's shape nail is embedded in the expansion pipe chamber, but this connecting piece only relies on worker's shape nail one end and expansion pipe chamber to be connected, can't be to worker's shape nail chucking, worker's shape nail appears easily and becomes flexible in the expansion pipe chamber, deviate from the scheduling problem, the steadiness that reduces furniture and connect, the life of furniture has been reduced, and during the installation worker's shape nail is difficult for blocking in the expansion pipe chamber, and the labor intensity is increased.

SUMMERY OF THE UTILITY MODEL

The utility model provides a hidden connecting piece for furniture, which is used for solving the technical problems that the conventional connecting piece is connected with an expansion pipe cavity only by one end of an I-shaped nail, the I-shaped nail is easy to loosen and fall out in the expansion pipe cavity, the stability of furniture connection is reduced, the service life of the furniture is shortened, the I-shaped nail is not easy to clamp in the expansion pipe cavity during installation, and the labor intensity is increased.

In order to solve the technical problem, the utility model discloses a hidden connecting piece for furniture, which comprises: the embedded bushing assembly comprises a screw assembly body and an embedded bushing assembly, wherein the screw assembly body is inserted and clamped in the embedded bushing assembly, the screw assembly comprises a first clamping connector and a second clamping connector, a first inner cavity and a second inner cavity are arranged in the embedded bushing assembly, the first clamping connector is clamped in the first inner cavity, and the second clamping connector is clamped in the second inner cavity.

Preferably, the screw rod subassembly includes the threaded rod, threaded rod one end sets up the limiting plate, the limiting plate is kept away from threaded rod one end sets up the head rod, the head rod is kept away from limiting plate one end sets up the second connecting rod, the second connecting rod is kept away from head rod one end sets up the second joint head, the second joint head is kept away from second connecting rod one end sets up the third connecting rod, the third connecting rod is kept away from second joint head one end sets up first joint head, the threaded rod the limiting plate the head rod the second connecting rod the second joint head the third connecting rod the first joint head adopts integrated into one piece technology to make.

Preferably, the outer wall of the threaded rod is provided with screw teeth.

Preferably, the limiting plate is close to the first connecting rod one end and sets up a first inclined plane, the first inclined plane is close to the first connecting rod one side orientation and is close to the inclined setting of limiting plate axis direction, the first connecting rod is close to the second connecting rod one end and sets up a second inclined plane, the second inclined plane is close to the inclined setting of second connecting rod one side orientation and is close to the inclined setting of first connecting rod axis direction, the second joint head is close to the inclined setting of second connecting rod one end and sets up the third inclined plane, the third inclined plane is close to the inclined setting of second connecting rod one side orientation and is close to the inclined setting of second joint axis direction, the second joint head is close to the inclined setting of third connecting rod one end as the fillet, the first joint head is close to the inclined setting of third connecting rod one end, the fourth inclined plane is close to the inclined setting of third connecting rod one side orientation and is close to the inclined setting of first joint axis direction, first joint is kept away from fourth inclined plane one end sets up to the round platform form, first joint head rest is close fourth inclined plane one end diameter is greater than first joint is kept away from fourth inclined plane one end diameter.

Preferably, the diameter of the first connecting rod is larger than that of the second connecting rod, the diameter of the second connecting rod is equal to that of the third connecting rod, the diameter of one end, close to the first connecting rod, of the first connecting rod is smaller than that of one end, close to the limiting plate, of the first connecting rod, and the diameter of the limiting plate is larger than that of the first connecting rod.

Preferably, pre-buried bush subassembly includes the bush monomer, bush monomer outer wall is provided with one or more annular skewed tooth or spur to one side, bush monomer inner wall is provided with first bead and second bead, first bead with the contact of second connecting rod outer wall, the second bead with the contact of third connecting rod outer wall, bush monomer lateral wall is followed bush monomer length direction sets up a plurality of connecting block, the bush monomer is provided with a plurality of, and is a plurality of the bush monomer passes through connecting block interconnect, and is a plurality of the bush monomer adopts integrated into one piece technology to make.

Preferably, the embedded bushing assembly is made of PVC materials.

Preferably, the embedded bushing assembly is provided with a first inner cavity at one end close to the second rib, a second inner cavity is arranged between the first rib and the second rib, the first inner cavity is matched with the first clamping head, the second inner cavity is matched with the second clamping head, and the outer wall of the first connecting rod is attached to the inner wall of the bushing monomer.

Preferably, the embedded bushing assembly can be rolled into a cylinder shape, and the embedded bushing assembly is far away from the inner wall of one end of the first inner cavity and is provided with a chamfer.

Preferably, still include fixed subassembly, fixed subassembly sets up first joint is kept away from third connecting rod one end, fixed subassembly includes:

one end of the sleeve is fixedly connected with one end, far away from the third connecting rod, of the first clamping joint;

the sliding block is arranged in the sleeve and is in sliding connection with the inner wall of the sleeve, one end of the sliding block extends to the outside of the sleeve and is provided with a pressing plate, pressing blocks are symmetrically arranged at the upper end and the lower end of the pressing plate, and the pressing blocks are arranged on one side, close to the sliding block, of the pressing plate;

the first spring is arranged in the sleeve, one end of the first spring is fixedly connected with one end, far away from the third connecting rod, of the first clamping joint, and the other end of the first spring is fixedly connected with the side wall of the sliding block;

two dwang, two the dwang symmetry sets up both sides outer wall about the sleeve, the dwang is close to sleeve one end with the articulated connection of sleeve outer wall, the dwang is close to first joint first side sets up the second spring, second spring one end with dwang lateral wall fixed connection, the second spring other end with first joint is kept away from third connecting rod one end fixed connection.

The technical scheme of the utility model has the following advantages: the utility model provides a hidden connecting piece for furniture, which comprises: the embedded bushing assembly comprises a screw assembly body and an embedded bushing assembly, wherein the screw assembly body is inserted and clamped in the embedded bushing assembly, the screw assembly comprises a first clamping connector and a second clamping connector, a first inner cavity and a second inner cavity are arranged in the embedded bushing assembly, the first clamping connector is clamped in the first inner cavity, and the second clamping connector is clamped in the second inner cavity. According to the embedded bushing assembly, the first clamping joint is clamped in the first inner cavity, the second clamping joint is clamped in the second inner cavity, the screw assembly and the embedded bushing assembly are connected more stably under the action of the first clamping joint and the second clamping joint, the screw assembly is not easy to fall out of the embedded bushing assembly, the connection between the two plates is more reliable and stable, and the screw assembly and the embedded bushing assembly are installed in a hidden mode, so that the overall attractiveness of furniture is improved.

Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the apparatus particularly pointed out in the written description and drawings thereof.

The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the principles of the utility model and not to limit the utility model. In the drawings:

FIG. 1 is a schematic view of the internal structure of a hidden connecting member for furniture according to the present invention;

FIG. 2 is a schematic view of the overall structure of a hidden connecting member for furniture according to the present invention;

FIG. 3 is a schematic view of a screw assembly of the present invention;

FIG. 4 is a front view of the screw assembly of the present invention;

FIG. 5 is a schematic view of the pre-buried bushing assembly of the present invention;

FIG. 6 is a schematic view of a bushing in accordance with the present invention;

FIG. 7 is a front view of a bushing in accordance with the present invention;

FIG. 8 is a schematic view of a hidden connector for furniture according to the present invention;

FIG. 9 is a schematic view of a fixing assembly of the present invention;

FIG. 10 is an enlarged view taken at A of FIG. 9 in accordance with the present invention;

FIG. 11 is a schematic view of a two-in-one connector for furniture;

figure 12 is a schematic view of an embodiment of the present invention fastener insert assembly.

In the figure: 1. a screw assembly; 2. pre-burying a bushing assembly; 3. a first card connector; 4. a second card connector; 5. a first lumen; 6. a second lumen; 7. a threaded rod; 8. a limiting plate; 9. a first connecting rod; 10. a second connecting rod; 11. a third connecting rod; 12. a first inclined surface; 13. a second inclined surface; 14. a third inclined surface; 15. a fourth inclined surface; 16. a bushing unit; 17. a first rib; 18. a second rib; 19. connecting blocks; 20. a sleeve; 21. a slider; 22. pressing a plate; 23. briquetting; 24. a first spring; 25. rotating the rod; 26. a second spring; 27. a first sheet material; 28. a second sheet material; 29. and (7) installing holes.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

In addition, the descriptions related to the first, the second, etc. in the present invention are only used for description purposes, do not particularly refer to an order or sequence, and do not limit the present invention, but only distinguish components or operations described in the same technical terms, and are not understood to indicate or imply relative importance or implicitly indicate the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions and technical features between various embodiments can be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not be within the protection scope of the present invention.

Example 1:

an embodiment of the present invention provides a hidden connector for furniture, as shown in fig. 1 to 10, including: screw rod subassembly 1 and embedded bushing subassembly 2, the grafting of 1 main part of screw rod subassembly clamps in embedded bushing subassembly 2, screw rod subassembly 1 includes first joint 3 and second joint 4, set up first inner chamber 5 and second inner chamber 6 in the embedded bushing subassembly 2, first joint 3 joint is in first inner chamber 5, second joint 4 joint is in the second inner chamber 6.

The working principle and the beneficial effects of the technical scheme are as follows: as shown in fig. 11, which is a schematic view of a conventional furniture two-in-one connecting piece, the connecting piece is connected to an expansion pipe cavity only by one end of an i-shaped nail, and the problem that the i-shaped nail is easy to loosen and fall out in the expansion pipe cavity is easily caused, so that the utility model provides a hidden connecting piece for furniture, when in use, one end of a screw rod assembly 1 is firstly installed in a threaded hole of a first plate 27, then an embedded bushing assembly 2 is rolled into a cylindrical shape, a first inner cavity 5 and a second inner cavity 6 are formed inside the preset bushing assembly, the first inner cavity 5 is aligned to an installation hole 29 of a second plate 28, then the preset bushing assembly is plugged into the installation hole 29 of the second plate 28, the other end of the screw rod assembly 1 is aligned to the embedded bushing assembly 2 in the installation hole 29 and is installed inside the embedded bushing assembly 2, a first clamping joint 3 is clamped in the first inner cavity 5, a second clamping joint 4 is clamped in the second inner cavity 6, the installation can be accomplished, joint effect through first joint 3 and first inner chamber 5, and the joint effect of second joint 4 and second inner chamber 6, make screw assembly 1 more firm with embedded bushing subassembly 2's being connected, screw assembly 1 is difficult for deviating from in embedded bushing subassembly 2, make the connection between two panels more reliable firm, the whole life of furniture has been prolonged, and screw assembly 1 and embedded bushing subassembly 2 hidden installation, the holistic aesthetic measure of furniture has been improved.

Example 2

On the basis of the above-described embodiment 1, as shown in fig. 1 to 6, the screw assembly 1 includes a threaded rod 7, a limiting plate 8 is arranged at one end of the threaded rod 7, a first connecting rod 9 is arranged at one end of the limiting plate 8 far away from the threaded rod 7, a second connecting rod 10 is arranged at one end of the first connecting rod 9 far away from the limit plate 8, a second clamping joint 4 is arranged at one end of the second connecting rod 10 far away from the first connecting rod 9, a third connecting rod 11 is arranged at one end of the second clamping joint head 4 far away from the second connecting rod 10, a first clamping head 3 is arranged at one end, far away from the second clamping head 4, of the third connecting rod 11, and the threaded rod 7, the limiting plate 8, the first connecting rod 9, the second connecting rod 10, the second clamping head 4, the third connecting rod 11 and the first clamping head 3 are manufactured by adopting an integral forming process;

the outer wall of the threaded rod 7 is provided with screw teeth;

the limiting plate 8 is provided with a first inclined surface 12 near one end of the first connecting rod 9, the first inclined surface 12 is inclined near one side of the first connecting rod 9 and is inclined near the axis direction of the limiting plate 8, the first connecting rod 9 is provided with a second inclined surface 13 near one end of the second connecting rod 10, the second inclined surface 13 is inclined near one side of the second connecting rod 10 and is inclined near the axis direction of the first connecting rod 9, the second clamping head 4 is provided with a third inclined surface 14 near one end of the second connecting rod 10, the third inclined surface 14 is inclined near one side of the second connecting rod 10 and is inclined near the axis direction of the second clamping head 4, one end of the second clamping head 4 near the third connecting rod 11 is provided with a round angle, and one end of the first clamping head 3 near the third connecting rod 11 is provided with a fourth inclined surface 15, the fourth inclined plane 15 is close to the third connecting rod 11 one side orientation is close to first joint 3 axis direction slope sets up, first joint 3 is kept away from 15 one end on fourth inclined plane sets up to the round platform form, first joint 3 is close to 15 one end diameters on fourth inclined plane are greater than first joint 3 is kept away from 15 one end diameters on fourth inclined plane.

The embedded bushing assembly 2 comprises a bushing single body 16, one or more annular skewed teeth or skewed spines are arranged on the outer wall of the bushing single body 16, a first rib 17 and a second rib 18 are arranged on the inner wall of the bushing single body 16, the first rib 17 is in contact with the outer wall of the second connecting rod 10, the second rib 18 is in contact with the outer wall of the third connecting rod 11, a plurality of connecting blocks 19 are arranged on the side wall of the bushing single body 16 along the length direction of the bushing single body 16, the bushing single body 16 is provided with a plurality of bushing single bodies 16, the bushing single bodies 16 are connected with each other through the connecting blocks 19, and the bushing single bodies 16 are manufactured by adopting an integral forming process;

the embedded bushing assembly 2 is made of a PVC material;

a first inner cavity 5 is formed in one end, close to the second rib 18, of the embedded bushing component 2, a second inner cavity 6 is formed between the first rib 17 and the second rib 18, the first inner cavity 5 is matched with the first clamping head 3, the second inner cavity 6 is matched with the second clamping head 4, and the outer wall of the first connecting rod 9 is attached to the inner wall of the bushing single body 16;

pre-buried bush subassembly 2 can be rolled up for cylindricly, pre-buried bush subassembly 2 is kept away from 5 one end inner walls of first inner chamber set up the chamfer.

The working principle and the beneficial effects of the technical scheme are as follows: when the embedded bushing assembly 2 is installed, the threaded rod 7 is installed inside the first plate 27, the outer wall of the threaded rod 7 is provided with threaded threads, the threaded rod 7 is in threaded connection with the threaded hole of the first plate 27, then the embedded bushing assembly 2 is rolled into a cylindrical shape from an initial state, a first inner cavity 5 and a second inner cavity 6 are formed inside the embedded bushing assembly 2, the first inner cavity 5 is located at one end, far away from the threaded rod assembly 1, of the embedded bushing assembly 2, then the cylindrical embedded bushing assembly 2 is plugged into the installation hole 29 of the second plate 28, then the first clamping connector 3 is aligned to an opening of one end, far away from the first inner cavity 5, of the embedded bushing assembly 2, then the first clamping connector 3 is plugged into the embedded bushing assembly 2, the first clamping connector 3 is arranged in a circular truncated cone shape, the diameter of one end, close to the fourth inclined surface 15, of the first clamping connector 3 is larger than that of one end, far away from the fourth inclined surface 15, of the first clamping connector 3, and the threaded rod assembly 1 can move integrally inside the embedded bushing assembly 2, the first lug joint 3 firstly extrudes the first rib 17, then the second rib 18 is extruded to enter the first inner cavity 5, the outer wall of the first lug joint 3 is attached to the inner wall of the first inner cavity 5, the second lug joint 4 extrudes the first rib 17 and then smoothly blocks into the second inner cavity 6, a round angle is arranged on one side, close to the first lug joint 3, of the second lug joint 4, the second lug joint 4 is also conveniently and smoothly blocked into the second inner cavity 6, after the second lug joint is completely blocked, the first rib 17 is contacted with the outer wall of the second connecting rod 10, the second rib 18 is contacted with the outer wall of the third connecting rod 11, the outer wall of the first connecting rod 9 is contacted with one side, far away from the annular inclined teeth or inclined spines, the annular inclined teeth or inclined spines can increase the friction between the embedded bushing assembly 2 and the mounting hole 29 of the second plate 28 and extrude the inner wall of the mounting hole 29, so that the embedded bushing assembly 2 is fixed in the mounting hole 29, and finally the connection between the screw assembly 1 and the embedded bushing assembly 2 is more stable, the screw assembly 1 is not easy to deviate from the embedded bushing assembly 2, so that the connection between the two plates is more reliable and stable, and the screw assembly 1 and the embedded bushing assembly 2 are installed in a hidden mode, so that the overall attractiveness of the furniture is improved.

Example 3

On the basis of embodiment 2, still include fixed subassembly, fixed subassembly sets up and keeps away from third connecting rod 11 one end at first joint head 3, and fixed subassembly includes:

one end of the sleeve 20 is fixedly connected with one end of the first clamping joint 3 away from the third connecting rod 11;

the sliding block 21 is arranged in the sleeve 20, the sliding block 21 is connected with the inner wall of the sleeve 20 in a sliding mode, one end of the sliding block 21 extends to the outside of the sleeve 20 and is provided with a pressing plate 22, pressing blocks 23 are symmetrically arranged at the upper end and the lower end of the pressing plate 22, and the pressing blocks 23 are arranged on one side, close to the sliding block 21, of the pressing plate 22;

the first spring 24 is arranged in the sleeve 20, one end of the first spring 24 is fixedly connected with one end, far away from the third connecting rod 11, of the first clamping joint 3, and the other end of the first spring 24 is fixedly connected with the side wall of the sliding block 21;

two dwang 25, two dwang 25 symmetries set up both sides outer wall about sleeve 20, and dwang 25 is close to sleeve 20 one end and is connected with sleeve 20 outer wall is articulated, and dwang 25 is close to first joint head 3 one side and sets up second spring 26, second spring 26 one end and dwang 25 lateral wall fixed connection, and the second spring 26 other end keeps away from 11 one end fixed connection of third connecting rod with first joint head 3.

The working principle and the beneficial effects of the technical scheme are as follows: when the screw assembly 1 is installed, the two rotating rods 25 are not in contact with the inner wall of the bushing single body 16 in the initial state, the pressing plate 22 can be firstly in contact with the inner wall of the installation hole 29 along with the movement of the screw assembly 1, the pressing plate 22 drives the sliding block 21 to slide in the sleeve 20 towards the direction close to the first clamping connector 3, then the first spring 24 is compressed, the pressing plate 22 drives the two pressing blocks 23 to move towards the direction close to the first clamping connector 3 at the same time, the pressing blocks 23 are gradually contacted with the side wall of the rotating rod 25, then the rotating rod 25 is driven to move towards the direction close to the inner wall of the first inner cavity 5, the inner wall of the first inner cavity 5 is gradually extruded, the outer wall of the lining single body 16 is driven to extrude the inner wall of the mounting hole 29, so that the connection between the embedded lining assembly 2 and the mounting hole 29 is more compact and stable, therefore, the connection stability between the two plates is improved, the embedded bushing assembly 2 is not easy to separate from the mounting hole 29, and the service life of the furniture is prolonged.

In one embodiment, as shown in fig. 12, the embedded bushing assembly 2 is composed of a plurality of bushing single bodies 16, two adjacent bushing single bodies 16 are fixedly connected by a plurality of connecting blocks 19, one end of each bushing single body 16 located at the middle position of the embedded bushing assembly 2, which is close to the second rib 18, is connected by two connecting blocks 19, and no connecting block 19 is arranged on each bushing single body 16, which is far away from the second rib 18.

The working principle and the beneficial effects of the technical scheme are as follows: the embedded bushing assembly 2 is composed of six bushing monomers 16, wherein two connecting blocks 19 are arranged between two bushing monomers 16 positioned in the middle of the embedded bushing assembly 2, the two connecting blocks 19 are positioned on the side, close to the second rib 18, of the bushing monomers 16, the two bushing monomers 16 are connected through the two connecting blocks 19, the other end of each of the two bushing monomers 16 is not provided with the connecting block 19, so that the embedded bushing assembly 2 is in a disconnected and separated state, four connecting blocks 19 are arranged between the other two adjacent bushing monomers 16, the two adjacent bushing monomers 16 are fixedly connected through the four connecting blocks 19, through the structural design, the embedded bushing assembly 2 is rolled into a cylindrical shape from an initial state when in use, and then when the screw assembly 1 is installed to the cylindrical embedded bushing assembly 2, the screw assembly 1 can be ensured to be concentric with the installation hole 29 after being inserted into the embedded bushing assembly 2, the center of the screw assembly 1 does not deviate from the center of the mounting hole 29, so that the plates are prevented from deviating during mounting, and the quality of furniture is improved.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the utility model. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. A concealed connection for furniture, comprising: screw rod subassembly (1) and embedded bushing subassembly (2), screw rod subassembly (1) main part is pegged graft and is clamped in embedded bushing subassembly (2), screw rod subassembly (1) includes first joint (3) and second joint (4), set up first inner chamber (5) and second inner chamber (6) in embedded bushing subassembly (2), first joint (3) joint is in first inner chamber (5), second joint (4) joint is in second inner chamber (6).

2. The hidden connecting piece for furniture according to claim 1, wherein the screw assembly (1) comprises a threaded rod (7), one end of the threaded rod (7) is provided with a limiting plate (8), the limiting plate (8) is far away from one end of the threaded rod (7) is provided with a first connecting rod (9), the first connecting rod (9) is far away from one end of the limiting plate (8) is provided with a second connecting rod (10), the second connecting rod (10) is far away from one end of the first connecting rod (9) is provided with a second clamping head (4), the second clamping head (4) is far away from one end of the second connecting rod (10) is provided with a third connecting rod (11), the third connecting rod (11) is far away from one end of the second clamping head (4) is provided with a first clamping head (3), the threaded rod (7), the limiting plate (8), the first connecting rod (9), The second connecting rod (10), the second clamping joint (4), the third connecting rod (11) and the first clamping joint (3) are manufactured by adopting an integral forming process.

3. Concealed connection according to claim 2, characterized in that the threaded rod (7) is provided with screw teeth on its outer wall.

4. The hidden connecting member for furniture according to claim 2, wherein the position-limiting plate (8) is provided with a first inclined surface (12) near one end of the first connecting rod (9), the first inclined surface (12) is inclined toward the position near the axis of the position-limiting plate (8) near one side of the first connecting rod (9), the first connecting rod (9) is provided with a second inclined surface (13) near one end of the second connecting rod (10), the second inclined surface (13) is inclined toward the position near one side of the second connecting rod (10) toward the axis of the first connecting rod (9), the second clamping head (4) is inclined toward one end of the second connecting rod (10) by a third inclined surface (14), the third inclined surface (14) is inclined toward the position near one side of the second connecting rod (10) toward the axis of the second clamping head (4), second joint (4) are close to third connecting rod (11) one end sets up to the fillet, first joint (3) are close to third connecting rod (11) one end sets up fourth inclined plane (15), fourth inclined plane (15) are close to third connecting rod (11) one side orientation is close to first joint (3) axis direction slope sets up, first joint (3) are kept away from fourth inclined plane (15) one end sets up to the round platform form, first joint (3) are close to fourth inclined plane (15) one end diameter is greater than first joint (3) are kept away from fourth inclined plane (15) one end diameter.

5. Hidden connection according to claim 2, characterized in that the diameter of the first connecting rod (9) is greater than the diameter of the second connecting rod (10), the diameter of the second connecting rod (10) is equal to the diameter of the third connecting rod (11), the diameter of the end of the first connecting rod (9) close to the second connecting rod (10) is smaller than the diameter of the end of the first connecting rod (9) close to the limiting plate (8), and the diameter of the limiting plate (8) is greater than the diameter of the first connecting rod (9).

6. Concealed connection according to claim 2, wherein the pre-embedded bushing assembly (2) comprises a bushing single body (16), one or more annular skewed teeth or skewed spines are arranged on the outer wall of the lining single body (16), a first convex rib (17) and a second convex rib (18) are arranged on the inner wall of the lining single body (16), the first rib (17) is contacted with the outer wall of the second connecting rod (10), the second rib (18) is contacted with the outer wall of the third connecting rod (11), the side wall of the lining single body (16) is provided with a plurality of connecting blocks (19) along the length direction of the lining single body (16), the bushing single body (16) is provided with a plurality of bushing single bodies (16), the plurality of bushing single bodies (16) are connected with each other through the connecting blocks (19), and the plurality of bushing single bodies (16) are manufactured by adopting an integral forming process.

7. The hidden connecting piece for furniture as claimed in claim 6, wherein the pre-embedded bushing assembly (2) is made of PVC.

8. The hidden connector for furniture according to claim 6, wherein a first inner cavity (5) is formed in one end, close to the second rib (18), of the embedded bushing assembly (2), a second inner cavity (6) is formed between the first rib (17) and the second rib (18), the first inner cavity (5) is matched with the first clamping connector (3), the second inner cavity (6) is matched with the second clamping connector (4), and the outer wall of the first connecting rod (9) is attached to the inner wall of the bushing single body (16).

9. The hidden connecting piece for furniture according to claim 6, characterized in that the embedded bushing assembly (2) can be rolled into a cylinder shape, and a chamfer is arranged on the inner wall of one end of the embedded bushing assembly (2) far away from the first inner cavity (5).

10. Concealed connection element according to claim 6, characterized in that it further comprises a fixing assembly arranged at the end of said first bayonet joint (3) remote from said third connecting rod (11), said fixing assembly comprising:

one end of the sleeve (20) is fixedly connected with one end, far away from the third connecting rod (11), of the first clamping joint (3);

the sliding block (21) is arranged in the sleeve (20), the sliding block (21) is connected with the inner wall of the sleeve (20) in a sliding mode, one end of the sliding block (21) extends to the outside of the sleeve (20) and is provided with a pressing plate (22), pressing blocks (23) are symmetrically arranged at the upper end and the lower end of the pressing plate (22), and the pressing blocks (23) are arranged on one side, close to the sliding block (21), of the pressing plate (22);

the first spring (24) is arranged in the sleeve (20), one end of the first spring (24) is fixedly connected with one end, far away from the third connecting rod (11), of the first clamping joint (3), and the other end of the first spring (24) is fixedly connected with the side wall of the sliding block (21);

two dwang (25), two dwang (25) symmetry sets up both sides outer wall about sleeve (20), dwang (25) are close to sleeve (20) one end with sleeve (20) outer wall is articulated to be connected, dwang (25) are close to first joint head (3) one side sets up second spring (26), second spring (26) one end with dwang (25) lateral wall fixed connection, the second spring (26) other end with first joint head (3) is kept away from third connecting rod (11) one end fixed connection.