Glueless sofa joint structure

Abstract

The utility model relates to furniture manufacturing technical field, concretely is a sofa splicing structure without gluing, including by the sofa body of base frame and backrest frame, the surface of base frame and backrest frame is provided with first splicing subassembly and second splicing subassembly, this second splicing subassembly, through the interlock of rotation half circle lock block and half ring frame, and use bolt fastening, then will butt joint together with two adjacent base frames, and annular interlock then ensured the stability of horizontal direction, to replace traditional glue water bonding through above -mentioned pure mechanical connection mode, realizes the quick assembly, firm fixed and nondestructive disassembly of sofa framework, and because completely avoid using harmful substance's industrial glue containing formaldehyde, benzene series etc, from the source eliminated the hidden danger of indoor air pollution, safeguarded the user health, realized the gluing assembly of sofa framework, guaranteed the structural strength, improved environmental protection and flexibility.

Description

Technical Field

[0001] This utility model relates to the field of furniture manufacturing technology, specifically to a sofa splicing structure that does not require adhesive bonding. Background Technology

[0002] A sofa is a type of upholstered furniture with a backrest and armrests, designed for multiple people to sit and lean against. It is filled with highly elastic materials such as sponge, down, and cotton, and covered with soft fabrics (such as cloth or leather) for a comfortable seating experience.

[0003] Currently, the sofa manufacturing industry generally relies on a combination of glue bonding and screw fixing when assembling sofa frames. At the joints of wooden or composite material frames, workers apply a large amount of industrial glue for initial positioning and reinforcement, and then tighten it with screws. However, this traditional process has some drawbacks. For example, the glue usually contains volatile organic compounds such as formaldehyde and benzene series, which will continue to be released during the lifespan of the sofa, causing indoor air pollution and harming human health. Moreover, sofa frames bonded with glue are permanent connections, and once assembled, they cannot be disassembled without damage. Therefore, a glue-free sofa splicing structure is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a sofa splicing structure without adhesive bonding, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a sofa splicing structure without glue, comprising a sofa body composed of a base frame and a backrest frame, wherein a first splicing component and a second splicing component are provided on the surfaces of the base frame and the backrest frame.

[0006] The first splicing component includes a locking rod, a locking frame, a dovetail groove, and a dovetail piece. The locking frame is fixedly connected to one side of the backrest frame. The locking rod has an L-shaped structure, and the locking frame is used to allow the bent part of the locking rod to be inserted into it. The dovetail groove is opened inside the base frame, and the dovetail piece is fixedly connected to the bottom side of the backrest frame.

[0007] The second splicing component includes two grooves, two semi-circular frames, and two semi-circular locking blocks. The grooves are formed on the top of the base frame, the semi-circular frames are fixedly connected to the inside of the grooves, and the semi-circular locking blocks are circumferentially slidably connected to the inside of the semi-circular frames.

[0008] Preferably, the dovetail groove is adapted to the shape of the dovetail piece and is used to pre-connect the backrest frame and the base frame when engaged.

[0009] Preferably, the first splicing assembly further includes a fixing frame, a connecting shaft, a torsion spring, and a first screw hole;

[0010] The fixing frame is fixedly connected to the other side of the backrest frame. The connecting shaft is formed at both ends of the non-bent portion of the locking rod. The two ends of the torsion spring are respectively engaged with the fixing frame and the locking rod. The bent portion of the locking rod and the interior of the locking frame are both provided with a first screw hole, and the first screw hole is used for a set of bolt thread connection.

[0011] Preferably, the connecting shaft is rotatably connected to the fixed frame, and the torsion spring in a twisted state is used to drive the locking rod to rotate downwards and reset.

[0012] Preferably, the second splicing component further includes two arc-shaped grooves, two protrusions, and two second screw holes;

[0013] The arc-shaped groove is formed on the surface of the semi-annular frame, and the protrusion is circumferentially slidably connected to the inside of the arc-shaped groove. Both the protrusion and the groove have a second screw hole inside.

[0014] Preferably, the protrusion is fixedly connected to the semi-circular locking block, and the second screw hole is used for threaded connection of another set of bolts.

[0015] Preferably, the semi-circular frame is used to allow another semi-circular locking block to slide circumferentially into it, and is used to connect and install the two adjacent base frames when engaged.

[0016] Compared with the prior art, the beneficial effects of this utility model are: the first splicing component slides the dovetail piece of the backrest frame into the dovetail groove of the base frame to achieve pre-positioning, and then uses the locking rod driven by the torsion spring to automatically lock the locking frame, and fastens the first splicing component with bolts. The engagement between the dovetail groove and the dovetail piece provides shear resistance, and the locking rod and the locking frame provide pull-out resistance.

[0017] The second splicing component interlocks with the semi-circular locking block and the semi-circular frame by rotating the semi-circular locking block and tightening it with bolts, thus connecting two adjacent base frames together. The circular interlocking ensures horizontal stability. This purely mechanical connection method replaces traditional glue bonding, enabling rapid assembly, stable fixation, and non-destructive disassembly of the sofa frame. Furthermore, by completely avoiding the use of industrial glues containing harmful substances such as formaldehyde and benzene compounds, the potential for indoor air pollution is eliminated at the source, protecting user health. This achieves glue-free assembly of the sofa frame, improving environmental friendliness and flexibility while ensuring structural strength. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the main structure of the present utility model;

[0019] Figure 2This is a side view of the structure of this utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the second splicing component of this utility model;

[0021] Figure 4 This is a schematic diagram of the structure of the first splicing component of this utility model;

[0022] Figure 5 This is a cross-sectional view of the fixing frame and locking frame of this utility model.

[0023] In the diagram: 1. Sofa body; 101. Base frame; 102. Backrest frame; 2. First splicing component; 201. Fixing frame; 202. Locking rod; 203. Locking frame; 204. Dovetail groove; 205. Dovetail piece; 206. Connecting shaft; 207. Torsion spring; 208. First screw hole; 3. Second splicing component; 301. Groove; 302. Semi-circular frame; 303. Semi-circular locking block; 304. Arc groove; 305. Protrusion; 306. Second screw hole. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see Figures 1-5 This utility model provides a technical solution for a sofa splicing structure without glue: a sofa splicing structure without glue includes a sofa body 1 composed of a base frame 101 and a backrest frame 102, and a first splicing component 2 and a second splicing component 3 are provided on the surfaces of the base frame 101 and the backrest frame 102.

[0026] The first splicing component 2 includes a locking rod 202, a locking frame 203, a dovetail groove 204, and a dovetail piece 205. The locking frame 203 is fixedly connected to one side of the backrest frame 102. The locking rod 202 has an L-shaped structure, and the locking frame 203 is used for the bent part of the locking rod 202 to be inserted into it. The dovetail groove 204 is opened inside the base frame 101, and the dovetail piece 205 is fixedly connected to the bottom side of the backrest frame 102.

[0027] The second splicing component 3 includes two grooves 301, two semi-circular frames 302 and two semi-circular locking blocks 303. The grooves 301 are opened on the top of the base frame 101, the semi-circular frames 302 are fixedly connected to the inside of the grooves 301, and the semi-circular locking blocks 303 are circumferentially slidably connected to the inside of the semi-circular frames 302.

[0028] The first splicing component 2 also includes a fixing frame 201, a connecting shaft 206, a torsion spring 207 and a first screw hole 208;

[0029] The fixing frame 201 is fixedly connected to the other side of the backrest frame 102. The connecting shaft 206 is formed at both ends of the non-bent part of the locking rod 202. The two ends of the torsion spring 207 are respectively engaged with the fixing frame 201 and the locking rod 202. The bent part of the locking rod 202 and the interior of the locking frame 203 are both provided with a first screw hole 208, and the first screw hole 208 is used for a set of bolt thread connection.

[0030] The second splicing component 3 also includes two arc-shaped grooves 304, two protrusions 305 and two second screw holes 306;

[0031] An arc-shaped groove 304 is formed on the surface of a semi-annular frame 302, and a protrusion 305 is circumferentially slidably connected to the inside of the arc-shaped groove 304. A second screw hole 306 is formed inside both the protrusion 305 and the groove 301.

[0032] Working principle: When assembling the backrest frame 102 and the base frame 101, the dovetail piece 205 on the bottom side of the backrest frame 102 is first inserted into the dovetail groove 204 inside the base frame 101. Since the shapes of the dovetail groove 204 and the dovetail piece 205 are compatible, they form a preliminary positioning when engaged, preventing the backrest frame 102 from moving horizontally, thus achieving a pre-connection. This provides good tensile strength and stability, but no glue is required. After the pre-connection, the worker rotates the bent part of the locking rod 202 upwards to disengage it from the locking frame 203. Then, the backrest frame 102 passes through the dovetail piece 205... 05 Slide into the dovetail groove 204, then release the locking rod 202. The restoring force of the torsion spring 207 drives the locking rod 202 to rotate downward, so that the bent part automatically inserts into the locking frame 203. At this time, the bent part of the locking rod 202 is aligned with the first screw hole 208 inside the locking frame 203. The locking rod 202 and the locking frame 203 are fastened together by a set of bolt threads connecting the first screw hole 208. In this way, the bent part of the locking rod 202 and the locking frame 203 form a rigid connection, preventing the backrest frame 102 from coming out in the vertical direction, thereby completing the firm connection between the base frame 101 and the backrest frame 102.

[0033] When the two base frames 101 are close together, the worker aligns the semicircular locking block 303 on one base frame 101 with the semi-circular frame 302 on the other base frame 101. By rotating the semicircular locking block 303, its protrusion 305 slides along the arc groove 304. The semicircular locking block 303 gradually embeds into the interior of the other semi-circular frame 302. When the semicircular locking block 303 is completely slid into the semi-circular frame 302, the two semicircular locking blocks 303 together form a complete ring lock structure, locking the two base frames 101 together. After the semicircular locking block 303 slides into place, the protrusion 305 aligns with the second screw hole 306 inside the groove 301. The second screw hole 306 is connected by another set of bolt threads to fasten the semicircular locking block 303 to the base frame 101. The tightening force of the bolts forces the semicircular locking block 303 to fit tightly with the semi-circular frame 302, eliminating gaps and ensuring the stability and load-bearing capacity of the joint.

[0034] It should be noted that after the frame is fully assembled, its surface will be covered with leather or other fabrics for upholstery. This glue-free structure avoids the risk of harmful substances from glue slowly being released through the fabric, making the final sofa product more environmentally friendly and healthier.

[0035] Please refer to this carefully. Figure 4 The dovetail groove 204 is adapted to the shape of the dovetail piece 205 and is used to pre-connect the backrest frame 102 and the base frame 101 when they are engaged.

[0036] In this embodiment: Since the dovetail groove 204 and the dovetail piece 205 are adapted to each other, they form a preliminary positioning when they are engaged, preventing the backrest frame 102 from moving in the horizontal direction and realizing pre-connection.

[0037] Please refer to this carefully. Figure 5 The connecting shaft 206 is rotatably connected to the fixed frame 201, and the torsion spring 207 in a twisted state is used to drive the locking rod 202 to rotate downwards to reset.

[0038] In this embodiment, the locking rod 202 has an L-shaped structure, and its bent part can be inserted into the lock frame 203. The locking rod 202 is rotatably connected to the fixing frame 201 through the connecting shaft 206, and maintains a downward rotation trend under the action of the torsion spring 207. The torsion spring 207 is always in a torsional state, and its elastic force ensures that the locking rod 202 remains in the locked position when there is no external force, preventing accidental loosening. This automatic reset mechanism improves the convenience and reliability of assembly.

[0039] Please refer to this carefully. Figure 3 The protrusion 305 is fixedly connected to the semi-circular locking block 303, and the second screw hole 306 is used for another set of bolt thread connection.

[0040] In this embodiment: the semicircular locking block 303 is fastened to the base frame 101 by connecting the second screw hole 306 with another set of bolts. The tightening force of the bolts forces the semicircular locking block 303 to fit tightly with the semicircular frame 302.

[0041] Please refer to this carefully. Figure 3 A semi-circular frame 302 is used to allow another semi-circular locking block 303 to slide circumferentially into it, and is used to assemble two adjacent base frames 101 when engaged.

[0042] In this embodiment, the circumferential sliding design of the semi-circular frame 302 and the semi-circular locking block 303 allows workers to operate from a single direction, simplifying the assembly process. At the same time, this interlocking structure disperses stress and improves the torsional and compressive resistance of the connection points.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-adhesive sofa splicing structure, comprising a sofa body (1) composed of a base frame (101) and a backrest frame (102), characterized in that: The surfaces of the base frame (101) and the backrest frame (102) are provided with a first splicing component (2) and a second splicing component (3); The first splicing component (2) includes a locking rod (202), a locking frame (203), a dovetail groove (204), and a dovetail piece (205). The locking frame (203) is fixedly connected to one side of the backrest frame (102). The locking rod (202) has an L-shaped structure, and the locking frame (203) is used for the bent part of the locking rod (202) to be inserted into it. The dovetail groove (204) is opened inside the base frame (101), and the dovetail piece (205) is fixedly connected to the bottom side of the backrest frame (102). The second splicing component (3) includes two grooves (301), two semi-circular frames (302) and two semi-circular locking blocks (303). The grooves (301) are opened on the top of the base frame (101). The semi-circular frames (302) are fixedly connected to the inside of the grooves (301). The semi-circular locking blocks (303) are circumferentially slidably connected to the inside of the semi-circular frames (302).

2. The sofa splicing structure without adhesive bonding according to claim 1, characterized in that: The dovetail groove (204) is adapted to the shape of the dovetail piece (205) and is used to pre-connect the backrest frame (102) and the base frame (101) when they are engaged.

3. The sofa splicing structure without adhesive bonding according to claim 1, characterized in that: The first splicing assembly (2) also includes a fixing frame (201), a connecting shaft (206), a torsion spring (207), and a first screw hole (208); The fixing frame (201) is fixedly connected to the other side of the backrest frame (102). The connecting shaft (206) is formed on both ends of the non-bent portion of the locking rod (202). The two ends of the torsion spring (207) are respectively engaged with the fixing frame (201) and the locking rod (202). The bent portion of the locking rod (202) and the interior of the locking frame (203) are both provided with a first screw hole (208), and the first screw hole (208) is used for a set of bolt thread connection.

4. The sofa splicing structure without adhesive bonding according to claim 3, characterized in that: The connecting shaft (206) is rotatably connected to the fixing frame (201), and the torsion spring (207) in a twisted state is used to drive the locking rod (202) to rotate downwards to reset.

5. The sofa splicing structure without adhesive bonding according to claim 1, characterized in that: The second splicing component (3) also includes two arc-shaped grooves (304), two protrusions (305) and two second screw holes (306); The arc-shaped groove (304) is formed on the surface of the semi-annular frame (302), and the protrusion (305) is circumferentially slidably connected to the inside of the arc-shaped groove (304). The protrusion (305) and the groove (301) are both provided with a second screw hole (306).

6. The sofa splicing structure without adhesive bonding according to claim 5, characterized in that: The protrusion (305) is fixedly connected to the semi-circular locking block (303), and the second screw hole (306) is used for threaded connection of another set of bolts.

7. The sofa splicing structure without adhesive bonding according to claim 5, characterized in that: One of the semi-circular frames (302) is used to allow another semi-circular locking block (303) to slide circumferentially into it, and is used to mate and install the two adjacent base frames (101) when engaged.

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