A pre-threaded connection element for furniture wood panels with hexagonal countersunk screw holes

Abstract

This invention relates to the field of board joining technology and discloses a pre-threaded connecting element for furniture boards with hexagonal countersunk screw holes. The element includes two boards, Board 1 and Board 2, each with a placement groove on its side. A connecting module includes a base 1 and a base 2. Base 1 is embedded in the placement groove on the side of Board 1, and base 2 is embedded in the placement groove on the side of Board 2. Base 1 and base 2 are correspondingly arranged to achieve horizontal side splicing of the two furniture boards, Board 1 and Board 2. This pre-threaded connecting element for furniture boards with hexagonal countersunk screw holes effectively solves the problem in existing technologies where, for the flat-joining of two boards in panel furniture construction, three-in-one eccentric parts and corner brackets are often used. However, this exposed connecting element leaves obvious marks on the outer surface of the board, affecting the appearance of the furniture.

Description

Technical Field

[0001] This invention relates to the field of board joining technology, and specifically to a pre-threaded connecting element for furniture boards with hexagonal countersunk screw holes. Background Technology

[0002] Wood panels are a very common material, widely used in daily life. Furniture such as cabinets and wooden tables often require connecting structures to link the various wood panels, facilitating quick assembly and disassembly. In panel furniture, two wood panels are often joined using horizontal sides on the same plane (flat joint). The reliability, aesthetics, and ease of installation of this joint directly determine the quality and lifespan of the furniture product.

[0003] In existing technologies, flat-joint installation is a very common installation method in panel furniture, custom furniture and wood decoration projects. When flat-jointing two wood boards, three-in-one eccentric parts and corner brackets are often used for connection. However, these exposed connecting elements leave obvious marks on the outer surface of the board, affecting the appearance quality of the furniture. Summary of the Invention

[0004] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a front threaded connection element for furniture wood panels with hexagonal countersunk screw holes, which can effectively solve the problem that in the existing technology, when installing two wood panels side by side, a three-in-one eccentric part and corner bracket are often used for connection. However, such exposed connection elements leave obvious marks on the outer surface of the board, affecting the appearance of the furniture.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention provides a front-mounted threaded connection element for furniture wood panels with hexagonal countersunk screw holes, comprising:

[0007] Board 1 and Board 2, both of which have placement grooves on their sides;

[0008] The connecting module includes a base one and a base two. The base one is embedded in the placement groove on the side of the board one, and the base two is embedded in the placement groove on the side of the board two. The base one and the base two are arranged correspondingly to realize the horizontal side splicing of two furniture wood boards, board one and board two. The base one is provided with a connector through a cavity opened in its interior.

[0009] The connecting component includes a connecting rod, which is rotatably connected to the inner wall of the cavity via a rotating shaft at its bottom end. An arc-shaped rod is fixedly connected to the outer end of the connecting rod, and an arc-shaped groove that fits against the outer surface of the arc-shaped rod is provided on the outer side of the second seat.

[0010] Furthermore, a tenon is fixedly connected to the side of the first seat, and a mortise groove that fits with the outer surface of the tenon is opened on the side of the second seat. Movable grooves are opened inside the first and second seats. A set of movable grooves is opened at the upper and lower ends of the first seat, and a set of movable grooves is opened at the upper and lower ends of the second seat. Locking components are provided inside the movable grooves.

[0011] Furthermore, the tenon adopts a tapered design with a gradually changing diameter, and the maximum diameter of the tenon is at the end closest to the base.

[0012] Furthermore, a torsion spring is connected inside the connecting rod and sleeved on the outer surface of the rotating shaft, a gear block is fixedly connected to the side of the connecting rod, a vertical rod is slidably connected inside the cavity, and a rack block that meshes with the outer surface of the gear block is fixedly connected to the outer surface of the vertical rod.

[0013] Furthermore, a countersunk threaded hole is provided at one end of the plate, and a screw is embedded inside the countersunk threaded hole, with the end of the screw being parallel to the bottom end of the vertical rod.

[0014] Furthermore, the locking member includes an abutment rod that slides horizontally inside the movable groove, a rotating rod that is hinged to the inner end of the abutment rod, and an insertion rod that slides vertically inside the movable groove that is hinged to the end of the rotating rod away from the abutment rod.

[0015] Furthermore, a connecting ring plate is fixedly connected to the outer circumference of the abutment rod, and a spring connected to the outer surface of the connecting ring plate is sleeved on the outer circumference of the abutment rod.

[0016] Furthermore, both the first and second plates have slots inside that communicate with the inside of the placement groove, and the outer end of the insertion rod is provided with a guide slope.

[0017] The technical solution provided by this invention has the following advantages compared with the prior art:

[0018] 1. This invention comprises a first plate, a second plate, a first seat, a second seat, a locking component, and a connecting component. A placement groove is formed on the mating end faces of the first and second plates. Both the first and second seats are embedded within the placement groove. After installation and locking, all components of the locking component and connecting component (abutment rod, insertion rod, and arc-shaped rod) are concealed within the first and second seats or the first and second plates. Simultaneously, the countersunk threaded hole is a countersunk design, located at the circumferential end of the first plate. After tightening the screw, the head is completely embedded in the countersunk threaded hole, without protruding from the circumferential end of the plate. Compared to the defects of exposed connecting components such as three-in-one eccentric parts and corner brackets in existing technologies, which leave hole positions, screw heads, or decorative cover marks on the plate surface, this invention completely preserves the integrity of the plate's appearance, with no exposed parts. It is suitable for the high-quality appearance requirements of high-end custom furniture and minimalist style home furnishings, solving the problem of existing connecting components' difficulty in balancing aesthetics and connectivity.

[0019] 2. The tenon of base one adopts a tapered design with a gradually decreasing diameter, which matches the mortise groove of base two. During splicing, automatic centering can be achieved through the inclined guide, eliminating the need for precise manual alignment and avoiding the problems of existing invisible connectors that rely on high-precision machining and are prone to misalignment during assembly. At the same time, in the initial state, the insertion rod and vertical rod are retracted inside the base. There are no protruding parts on the outer surfaces of base one and base two, allowing them to be smoothly inserted into the placement groove without interference or jamming during the installation process. When splicing the plates, simply push the plate to press the abutment rod and then tighten the front screw to complete the final locking. The operation is simple and efficient, requiring no special complicated tools.

[0020] 3. Existing embedded connectors require additional bolts and adhesive to maintain their integrity with the wood panel, increasing installation steps and material costs. Furthermore, the adhesive requires curing time, bolt fixing can damage the internal structure of the panel, and the adhesive is prone to aging and failure after long-term use, leading to separation of the connector from the panel. This invention, however, utilizes the linkage of locking components during flat joining. During the splicing of panel one and panel two, the abutment rod, under pressure, drives the insertion rod to automatically embed into the slot within the panel. This eliminates the need for additional bolts and adhesive fixing components, achieving a secure fixation of the base one and base two to the corresponding panels. This simplifies the installation process, improves assembly efficiency, avoids damage to the panel from additional fixing components, and further enhances the reliability and durability of the connection.

[0021] 4. This invention first positions the base body one and base body two using a tapered tenon and mortise groove, then fixes base body one and base body two to the plate using a plug rod and slot, and finally locks base body one, base body two, plate one, and plate two completely together using an arc-shaped rod and arc-shaped groove. Compared to existing single snap-fit ​​or threaded tightening methods for connectors, the reliability of the connection is greatly improved. The arc-shaped rod and arc-shaped groove feature a precisely fitted arc design, forming a large-area contact fit. Compared to existing point contact or line contact connections, this can evenly distribute the force, avoid stress concentration, and effectively resist horizontal tensile forces, shear forces, and external forces from different directions. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0023] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of seat body one and seat body two according to an embodiment of the present invention;

[0025] Figure 3 This is a cross-sectional structural diagram of plate 1, plate 2, base 1, and base 2 according to an embodiment of the present invention;

[0026] Figure 4 This is an embodiment of the present invention. Figure 3 A magnified structural diagram of part A in the middle;

[0027] Figure 5 This is a schematic diagram of the separated structure of plate 1, base 1, and screws in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the connector structure according to an embodiment of the present invention;

[0029] Figure 7 This is a schematic diagram of the connecting rod, gear block, and arc rod according to an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the state change structure of the connector according to an embodiment of the present invention;

[0031] Figure 9 This is a schematic diagram of the locking component according to an embodiment of the present invention.

[0032] The labels in the diagram represent: 11, Plate 1; 111, Placement slot; 112, Countersunk threaded hole; 113, Slot; 12, Plate 2; 2, Connecting module; 21, Base 1; 211, Cavity; 212, Tenon; 213, Movable slot; 22, Base 2; 221, Arc groove; 222, Mortise groove; 23, Connector; 231, Connecting rod; 232, Arc rod; 233, Torsion spring; 234, Gear block; 235, Vertical rod; 236, Rack block; 237, Screw; 24, Locking component; 241, Abutment rod; 242, Rotating rod; 243, Insert rod; 244, Connecting ring plate; 245, Spring. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] The present invention will be further described below with reference to embodiments.

[0035] Example:

[0036] Please see Figures 1-9 This invention provides a technical solution: a front-mounted threaded connection element for furniture wood panels with hexagonal countersunk screw holes, comprising:

[0037] Board 11 and Board 212 are provided with placement grooves 111 on their sides.

[0038] The connecting module 2 includes a base 1 21 and a base 2 22. The base 1 21 is embedded in the placement groove 111 on the side of the board 1 11, and the base 2 22 is embedded in the placement groove 111 on the side of the board 2 12. The base 1 21 and the base 2 22 are arranged correspondingly to realize the horizontal side splicing of the two furniture wood boards 1 11 and 2 12. The base 1 21 is provided with a connector 23 through the cavity 211 opened inside it.

[0039] The connector 23 includes a connecting rod 231, which is rotatably connected to the inner wall of the cavity 211 via a rotating shaft at its bottom end. An arc-shaped rod 232 is fixedly connected to the outer end of the connecting rod 231, and an arc-shaped groove 221 that fits against the outer surface of the arc-shaped rod 232 is provided on the outer side of the seat 22.

[0040] The side of the first seat 21 is fixedly connected with a tenon 212. The side of the second seat 22 is provided with a mortise groove 222 that fits with the outer surface of the tenon 212. The interior of both the first seat 21 and the second seat 22 is provided with a movable groove 213. The upper and lower ends of the first seat 21 are each provided with a set of movable grooves 213. The upper and lower ends of the second seat 22 are also provided with a set of movable grooves 213. The movable groove 213 is provided with a locking member 24.

[0041] The tenon 212 adopts a tapered design with a gradually changing diameter, and the largest diameter of the tenon 212 is at the end closest to the base 21.

[0042] A torsion spring 233 is sleeved on the outer surface of the rotating shaft inside the connecting rod 231. A gear block 234 is fixedly connected to the side of the connecting rod 231. A vertical rod 235 is slidably connected inside the cavity 211. A rack block 236 that meshes with the outer surface of the gear block 234 is fixedly connected to the outer surface of the vertical rod 235.

[0043] A countersunk threaded hole 112 is provided at the end of the plate 11. It should be noted that in actual application, the countersunk threaded hole 112 can be flexibly set at the top, bottom or side of the plate 11 according to the actual installation requirements. This invention only takes the countersunk threaded hole 112 being set at the bottom of the plate 11 as an example for detailed description. The adjustment of its setting position does not affect the overall structure and working principle of this invention. A screw 237 is embedded inside the countersunk threaded hole 112. The end of the screw 237 is parallel to the bottom end of the vertical rod 235. The length of the screw 237 is slightly less than the depth of the countersunk threaded hole 112.

[0044] The locking member 24 includes an abutment rod 241 that slides horizontally inside the movable groove 213. The inner end of the abutment rod 241 is hinged to a rotating rod 242. The end of the rotating rod 242 away from the abutment rod 241 is hinged to an insertion rod 243 that slides vertically inside the movable groove 213.

[0045] A connecting ring plate 244 is fixedly connected to the outer circumference of the abutment rod 241, and a spring 245 connected to the outer surface of the connecting ring plate 244 is sleeved on the outer circumference of the abutment rod 241.

[0046] Both plate 11 and plate 212 have slots 113 that communicate with the inside of the placement groove 111, and the outer end of the insertion rod 243 is provided with a guide slope.

[0047] The connecting element in this invention mainly comprises three components: board 11, board 2, and connecting module 2. Board 11 and board 2 12 are two pieces of furniture wood to be connected, and their materials can be solid wood, engineered wood, or other commonly used furniture boards. Placement grooves 111 are provided on the sides of both board 11 and board 2 12. The shape and size of the placement grooves 111 match the base of the connecting module 2, and are used to accommodate and fix the various components of the connecting module 2. The placement grooves 111 are located on the sides of the boards, that is, the end faces that contact each other when board 11 and board 2 12 are joined. This allows for concealed installation of the connector 23, ensuring that the connector 23 is not exposed on the outer surface of the furniture after connection.

[0048] The connecting module 2 is the core component for connecting two sheet metal pieces. It mainly includes a base 1 (21), a base 2 (22), and connectors 23 and locking components 24 housed within the bases. Base 1 (21) is embedded in the placement groove 111 on the side of sheet metal 11, and base 2 (22) is embedded in the placement groove 111 on the side of sheet metal 2 (12). Base 1 (21) and base 2 (22) are correspondingly arranged, meaning that when sheet metal 11 and sheet metal 2 (12) are joined, base 1 (21) and base 2 (22) can cooperate to achieve horizontal side splicing of sheet metal 11 and sheet metal 2 (12). Base 1 (21) has an internal cavity 211 to accommodate the components of connector 23. Both the upper and lower ends of base 1 (21) and base 2 (22) have movable grooves 213 to accommodate the components of locking components 24.

[0049] In the initial state, within the locking member 24 inside the movable groove 213, the outer end of the abutment rod 241 protrudes from the outer surface of the side of the seat 21 under the elastic force of the spring 245. The spring 245 is in a naturally extended state, generating an outward pushing force on the connecting ring plate 244, thereby causing the abutment rod 241 to remain in an outward protruding state. The inner end of the abutment rod 241 is hinged to the rotating rod 242. When the abutment rod 241 protrudes outward, its inner end pulls the rotating rod 242 to rotate. The end of the rotating rod 242 away from the abutment rod 241 drives the insertion rod 243 to move upward. At this time, the insertion rod 243 is completely retracted inside the movable groove 213 and does not protrude from the outer surface of the seat 21 and the second seat 22, thus avoiding interference between the seat 21 and the second seat 22 and the inner wall of the placement groove 111 during installation.

[0050] In connector 23, the connecting rod 231 is tilted to the right under the elastic preload of the internal torsion spring 233. The torsion spring 233 is sleeved on the outer surface of the rotating shaft circumference inside the bottom end of the connecting rod 231, generating a clockwise preload torque on the connecting rod 231. The inner wall of the cavity 211 is in contact with the side of the connecting rod 231, preventing the connecting rod 231 from continuing to rotate clockwise and placing it at the starting position within its rotational stroke range. It is only allowed to rotate counterclockwise when subjected to external force. When the connecting rod 231 is tilted to the right, it drives the gear block 234 fixedly connected to its outer surface to be in the corresponding position. At this time, the arc-shaped rod 232 is retracted inside the cavity 211 and does not protrude from the side of the seat 1 21, avoiding collision and interference when the seat 1 21 and the seat 2 22 are spliced. The rack block 236, which meshes with the gear block 234, drives the vertical rod 235 to the lowest point within its sliding stroke range under the limiting action of the gear block 234. At this time, the bottom end of the vertical rod 235 is slightly higher than the lower surface of the seat 21, so as to avoid interference between the seat 21 and the inner wall of the placement groove 111 during installation.

[0051] At this point, the placement grooves 111, slots 113, and countersunk threaded holes 112 of plate 11 and plate 212 have all been processed and their dimensions match the corresponding parts. The base 1 21 and base 2 22 have not yet been installed into the placement groove 111.

[0052] Installation process of base body 1 21 and base body 2 22:

[0053] First, install the base 1 (21) and base 2 (22). Align base 1 (21) with the placement groove 111 on the side of plate 1 (11), and align base 2 (22) with the placement groove 111 on the side of plate 2 (12). Insert base 1 (21) and base 2 (22) into their respective placement grooves 111. Since the insertion rod 243 is retracted into the movable groove 213 and the vertical rod 235 is retracted into the cavity 211, and there are no protruding parts on the outer surfaces of base 1 (21) and base 2 (22), they can be smoothly inserted into the placement grooves 111. After base 1 (21) and base 2 (22) are inserted into the placement grooves 111, their outer surfaces remain flush with the sides of plate 1 (11) and plate 2 (12), ensuring a tight fit between the two plates during subsequent splicing.

[0054] The splicing process of board 11 and board 212:

[0055] After the installation of base 1 (21) and base 2 (22) is completed, the horizontal connection operation of plate 1 (11) and plate 2 (12) begins. First, align plate 1 (11) with base 1 (21) and plate 2 (22) with base 2 (22), so that the tenon 212 on the side of base 1 (21) aligns with the mortise groove 222 on the side of base 2 (22). Since the tenon 212 adopts a tapered design with a gradually changing diameter, when the tenon 212 contacts the mortise groove 222, the inclined surface guides the automatic centering, ensuring that base 1 (21) and base 2 (22) are accurately aligned and avoiding misalignment during splicing.

[0056] Slowly push plate 11 and plate 22, so that the adjacent surfaces of seat 1 21 and seat 2 22 gradually approach each other. During this process, the abutment rods 241 inside seat 1 21 and seat 2 22 are both in an outward protruding state and move towards each other synchronously with the two plates. As the distance between seat 1 21 and seat 2 22 gradually decreases, the outer ends of the abutment rods 241 inside them gradually contact each other. Continue to push the plates, and the abutment rods 241 are subjected to mutual squeezing force, which overcomes the elastic preload of spring 245 and slides horizontally into the movable groove 213. Spring 245 is compressed by connecting ring plate 244, generating a reverse elastic restoring force.

[0057] When the abutment rod 241 slides into the movable groove 213, its inner end drives the hinged rotating rod 242 to rotate. The rotating rod 242 rotates and presses the hinged insertion rod 243, causing the insertion rod 243 to slide vertically along the inner wall of the movable groove 213. Movable grooves 213 and locking components 24 are provided at both the upper and lower ends of the seat body 1 21 and seat body 22. The insertion rod 243 located inside the upper movable groove 213 slides vertically upward under the action of the rotating rod 242, while the insertion rod 243 located inside the lower movable groove 213 slides vertically downward under the action of the rotating rod 242. The guide slope at the outer end of the insertion rod 243 acts as a guide, allowing the insertion rod 243 to smoothly insert into the slots 113 opened inside the plates 11 and 22, achieving initial locking between the seat body 21 and plate 11, and between the seat body 22 and plate 22. At this time, the sides of plate 11 and plate 22 are basically in contact, completing the initial splicing.

[0058] Locking process of board 11 and board 212:

[0059] After the first plate 11 and the second plate 12 are initially attached, the first plate 11 and the second plate 12 are locked together. Since the length of the screw 237 is less than the depth of the countersunk threaded hole 112, initially neither the top nor bottom end of the screw 237 protrudes from the outer surface of the countersunk threaded hole 112. The countersunk threaded hole 112 is suitable for standard hexagon socket screws 237, so the screw 237 embedded in the countersunk threaded hole 112 can be tightened using an Allen wrench. During the tightening of the screw 237, the tip of the screw 237 gradually penetrates the countersunk threaded hole 112 and contacts the bottom end of the vertical rod 235. As the screw 237 continues to tighten, the screw 237 applies an upward thrust to the vertical rod 235, causing the vertical rod 235 to slide vertically upward along the inner wall of the cavity 211.

[0060] When the vertical rod 235 slides upward, the rack block 236 fixedly connected to its outer surface slides upward synchronously. The rack block 236 meshes with the teeth on the outer surface of the gear block 234. Through gear meshing transmission, the gear block 234 is driven to rotate counterclockwise. The gear block 234 drives the connecting rod 231 fixedly connected to it to rotate counterclockwise around the rotation axis at its bottom end. The torsion spring 233 sleeved on the outer surface of the rotation axis is twisted, generating a clockwise elastic restoring force.

[0061] When the connecting rod 231 rotates counterclockwise, the arc-shaped rod 232 fixedly connected to its outer end rotates synchronously, gradually unscrewing from inside the cavity 211 and extending towards the second seat 22. Continue to tighten the screw 237 until it is fully tightened. At this time, the connecting rod 231 is in a vertical state, and the arc-shaped rod 232 is completely embedded in the arc-shaped groove 221 inside the second seat 22. The outer surface of the arc-shaped rod 232 is tightly fitted with the inner wall of the arc-shaped groove 221, realizing the final locking of the first seat 21 and the second seat 22, thereby completing the horizontal side splicing and fixing of the two furniture wood panels 11 and 12.

[0062] At this point, the head of screw 237 is fully embedded inside the countersunk threaded hole 112, not protruding from the surface of board 11. The arc-shaped rod 232, the abutment rod 241, and the insertion rod 243 are all hidden inside the base 1 21 and base 2 22 or the wooden board, achieving fully concealed installation without compromising the appearance integrity of the board. Simultaneously, the tapered fit of tenon 212 and mortise 222, the embedded fit of insertion rod 243 and slot 113, and the interlocking fit of arc-shaped rod 232 and arc-shaped groove 221 form a multi-locking structure, significantly improving connection strength and effectively resisting stress caused by thermal expansion and contraction of wood and daily vibrations, preventing loosening and separation of the connection.

[0063] With plates 11 and 22 locked, in the locking member 24, the abutment rod 241 is compressed and retracted inside the movable groove 213, and the insertion rod 243 extends out of the movable groove 213 and inserts into the slot 113. The cooperation between the insertion rod 243 and the slot 113 achieves a fixed connection between the seat 1 21 and plate 11, and between the seat 2 22 and plate 2 12, ensuring that the seat 1 21 and seat 2 22 are firmly fixed inside the wooden board and will not loosen or fall off. The spring 245 is in a compressed state, storing elastic potential energy. When plates 11 and 22 separate, the spring 245 releases the elastic potential energy, causing the abutment rod 241 to return to its protruding state, and the insertion rod 243 to retract back into the movable groove 213.

[0064] Meanwhile, the connecting rod 231 in connector 23 rotates counterclockwise to its limit position under the action of gear block 234, vertical rod 235, and rack block 236, and the arc-shaped rod 232 is fully embedded in the arc-shaped groove 221 inside the seat 22. The torsion spring 233 is in a torsional state inside the connecting rod 231, storing elastic potential energy. When the subsequent screw 237 is loosened, the torsion spring 233 can release the elastic potential energy, causing the connecting rod 231 to rotate clockwise back to its initial position.

[0065] The curved rod 232 and the curved groove 221 are designed with a shape fit, with the outer surface of the curved rod 232 closely fitting the inner wall of the curved groove 221 to form a large-area contact fit. Compared with point contact or line contact connections, this surface contact fit can withstand greater loads and the connection is more robust and reliable. When the plates 11 and 12 are subjected to horizontal tensile force, the fit between the curved rod 232 and the curved groove 221 can effectively resist the tensile force and prevent the plates from separating. Furthermore, in practical applications, the direction of external force on the plates can vary, and the curved design of the curved rod 232 and the curved groove 221 allows the connection structure to better adapt to different directional force conditions. Regardless of the direction of the external force, the curved rod 232 can find a suitable support point in the curved groove 221, and the inner wall of the curved groove 221 provides all-around constraint on the curved rod 232, limiting its displacement in all directions and ensuring the stability of the connection. Secondly, both the arc-shaped rod 232 and the arc-shaped groove 221 adopt an arc-shaped design. When the arc-shaped rod 232 is embedded in the arc-shaped groove 221, the contact surface between them is an arc-shaped surface. This arc-shaped contact surface allows the force to be evenly distributed along the arc-shaped surface, avoiding stress concentration. Compared with the fit between a straight rod and a straight groove, the arc-shaped fit can transmit the force more evenly to the entire contact surface when bearing load, reducing the risk of excessive local stress and extending the service life of the connector 23. Finally, the fit between the arc-shaped rod 232 and the arc-shaped groove 221 has a self-locking characteristic. When the arc-shaped rod 232 is fully embedded in the arc-shaped groove 221, under normal use, external vibration will not cause the arc-shaped rod 232 to automatically exit the arc-shaped groove 221. This is because the arc-shaped rod 232 is constrained in multiple directions inside the arc-shaped groove 221, and the force generated by vibration is difficult for the arc-shaped rod 232 to overcome these constraints and exit.

[0066] Disassembly process of board 11 and board 22:

[0067] When it is necessary to disassemble plate 11 and plate 22, simply loosen screw 237 in the reverse direction using an Allen wrench. Screw 237 returns to its original position inside the countersunk threaded hole 112. At this time, the upward pushing force of the top of screw 237 on vertical rod 235 disappears, and vertical rod 235 loses the support of screw 237. Under the elastic restoring force of torsion spring 233, connecting rod 231 rotates clockwise to return to its initial position. When connecting rod 231 rotates clockwise, it drives gear block 234 to rotate clockwise. Gear block 234 drives vertical rod 235 to slide downward to return to its initial position through rack block 236. At this time, when connecting rod 231 rotates clockwise, it will simultaneously drive arc rod 232 to exit the arc groove 221 inside seat 22, realizing the unlocking between seat 1 21 and seat 2 22. The two plates are separated from each other. During the separation process, the abutment rod 241 inside seat 1 21 and the abutment rod 241 inside seat 22 gradually separate. The spring 245 releases its elastic potential energy, causing the abutment rod 241 to return to its protruding state. When the abutment rod 241 returns to its protruding state, the insert rod 243 is retracted into the movable groove 213 by the rotating rod 242, releasing the locking state between seat 1 21 and plate 1 11, and between seat 2 22 and plate 2 12, thus enabling disassembly and maintenance, and allowing for the next installation and use.

[0068] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pre-threaded connection element for furniture wood panels with hexagonal countersunk screw holes, characterized in that, include: Plate 1 (11) and Plate 2 (12) are provided with placement grooves (111) on their sides. The connection module (2) includes a base one (21) and a base two (22). The base one (21) is embedded in the placement groove (111) on the side of the plate one (11), and the base two (22) is embedded in the placement groove (111) on the side of the plate two (12). The base one (21) and the base two (22) are arranged correspondingly. The base one (21) is provided with a connector (23) through the cavity (211) opened inside it. The connector (23) includes a connecting rod (231), which is rotatably connected to the inner wall of the cavity (211) via a rotating shaft at its bottom end. An arc-shaped rod (232) is fixedly connected to the outer end of the connecting rod (231). An arc-shaped groove (221) that fits against the outer surface of the arc-shaped rod (232) is provided on the outer side of the second seat (22). A tenon (212) is fixedly connected to the side of the first seat (21), and a mortise groove (222) that fits against the outer surface of the tenon (212) is provided on the side of the second seat (22). Movable grooves are provided inside both the first seat (21) and the second seat (22). (213) The movable groove (213) is provided with a locking member (24). The locking member (24) includes an abutment rod (241) that slides horizontally inside the movable groove (213). The inner end of the abutment rod (241) is hinged to a rotating rod (242). The end of the rotating rod (242) away from the abutment rod (241) is hinged to an insertion rod (243) that slides vertically inside the movable groove (213). A connecting ring plate (244) is fixedly connected to the outer circumference of the abutment rod (241). A spring (245) connected to the outer surface of the connecting ring plate (244) is sleeved on the outer circumference of the abutment rod (241).

2. The furniture wood panel front threaded connection element with hexagonal countersunk screw holes according to claim 1, characterized in that: The tenon (212) adopts a tapered design with a gradually changing diameter, and the largest diameter of the tenon (212) is at the end closest to the base (21).

3. A pre-threaded connection element for furniture wood panels with hexagonal countersunk screw holes according to claim 1, characterized in that: The connecting rod (231) is internally connected to a torsion spring (233) sleeved on the outer surface of the rotating shaft. A gear block (234) is fixedly connected to the side of the connecting rod (231). A vertical rod (235) is slidably connected inside the cavity (211). A rack block (236) that meshes with the outer surface of the gear block (234) is fixedly connected to the outer surface of the vertical rod (235).

4. A pre-threaded connection element for furniture wood panels with hexagonal countersunk screw holes according to claim 3, characterized in that: The end of the plate (11) is provided with a countersunk threaded hole (112), and a screw (237) is embedded inside the countersunk threaded hole (112). The end of the screw (237) is parallel to the bottom end of the vertical rod (235).

5. A pre-threaded connection element for furniture wood panels with hexagonal countersunk screw holes according to claim 4, characterized in that: Both the first plate (11) and the second plate (12) have slots (113) that communicate with the inside of the placement groove (111), and the outer end of the insertion rod (243) is provided with a guide slope.

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