Seat with foldable backrest

Abstract

The invention belongs to the field of furniture, and discloses a chair with a foldable backrest, which comprises a base, a chair seat arranged on the base, a backrest arranged on the chair seat and armrests, and two ends of the chair seat and two ends of the backrest are respectively provided with a backrest locking mechanism. The backrest locking mechanism comprises a chair seat fixing seat arranged on the chair seat, a backrest connecting seat arranged on the backrest and rotationally connected with the chair seat fixing seat, and an insertion and extraction assembly inserted into the chair seat fixing seat and the backrest connecting seat in a sliding manner, the chair seat fixing seat cannot rotate relative to the chair seat, and the backrest rotates along with the backrest connecting seat. Rotation and locking of the backrest are achieved through the backrest locking mechanism, the structure is simple, and operation is convenient. When the backrest rotates, the chair seat is not driven to move together, so that the user experience is better.

Description

Technical Field

[0001] This invention relates to the field of furniture, specifically to a chair with a foldable backrest. Background Technology

[0002] A chair consists of a base, seat, backrest, and armrests. In traditional chair designs, the backrest is typically fixed to the seat with screws. For packaging and shipping purposes, manufacturers usually separate the backrest from the seat during packaging. Upon receiving the product, users need to find the screws and other parts themselves and assemble the backrest and seat according to the instructions. This process is not only time-consuming and laborious but often requires tools, causing significant inconvenience and increasing the risk of malfunctions due to improper assembly. Furthermore, while some existing chairs offer simultaneous seat and backrest tilting, it's difficult to achieve independent backrest tilting. Summary of the Invention

[0003] The purpose of this invention is to provide a seat with a foldable backrest to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A foldable chair includes a base, a seat on the base, a backrest and armrests on the seat. Backrest locking mechanisms are provided at both ends of the seat and both ends of the backrest. Each backrest locking mechanism includes a seat fixing seat on the seat, a backrest connecting seat on the backrest and rotatably connected to the seat fixing seat, and a plug-in assembly slidably inserted into the seat fixing seat and the backrest connecting seat. The seat fixing seat cannot rotate relative to the seat, while the backrest connecting seat rotates with the backrest. The plug-in assembly has a locked state and an unlocked state. When locked, the plug-in assembly is inserted into the backrest connecting seat and the seat fixing seat and locked in place, preventing the backrest connecting seat from rotating relative to the seat fixing seat. When unlocked, the plug-in assembly slides axially out of the locked state, allowing the backrest connecting seat to rotate relative to the seat fixing seat.

[0005] Furthermore, the armrest is rotatably connected to the backrest connecting seat.

[0006] Furthermore, the armrest is connected to the backrest connecting seat by a number of second screws, and a number of second arc grooves are formed on the armrest to slide in connection with the second screws. The second arc grooves are used to limit the rotation angle of the armrest relative to the backrest.

[0007] Furthermore, the seat fixing base and the seat are in a circumferential upper limit fit.

[0008] Furthermore, the inner wall of the mounting hole for installing the plug-in assembly is provided with a stop portion, and the plug-in assembly is provided with an elastic positioning bead, which is used to cooperate with the stop portion.

[0009] Furthermore, the plug-in assembly is provided with a first latching portion and a second latching portion at intervals, the seat fixing base is provided with a third latching portion, and the backrest connecting base is provided with a fourth latching portion. When the plug-in assembly is in the locked state, the first latching portion and the third latching portion are engaged, and the second latching portion and the fourth latching portion are engaged. When the plug-in assembly is in the unlocked state, the first latching portion is separated from the third latching portion and the fourth latching portion.

[0010] Furthermore, one end of the plug-in assembly extends from the seat fixing base for operation.

[0011] Furthermore, the backrest connecting seat is connected to the seat fixing seat by a number of first screws, and a number of first arc grooves are formed on the backrest connecting seat to slide in connection with the first screws. The first arc grooves are used to limit the rotation angle of the backrest connecting seat and the backrest.

[0012] Furthermore, a torsion spring is provided between the backrest connecting seat and the seat fixing seat. When the backrest tilts forward, the backrest connecting seat does not load the torsion spring. When the backrest tilts backward, the backrest connecting seat loads the torsion spring, so that the torsion spring provides elastic force for the backrest to return to its original position.

[0013] Furthermore, the plug-in assembly includes a plug-in component that is slidably plugged into the seat fixing base and a connector that is slidably plugged into the backrest connecting base, wherein the plug-in component is connected to the connector.

[0014] Compared with the prior art, the beneficial effects of the present invention are: 1) The backrest rotation and locking are achieved through a backrest locking mechanism, which is simple in structure and easy to operate; 2) The backrest will not cause the seat to move when it rotates, providing a better user experience. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention in its unfolded state.

[0016] Figure 2 This is a schematic diagram of the structure of the present invention in a folded state.

[0017] Figure 3 This is a longitudinal cross-sectional view of the present invention in its unfolded state.

[0018] Figure 4 for Figure 3 Enlarged view of point A in the middle.

[0019] Figure 5This is an exploded view of the backrest locking mechanism in this invention.

[0020] Figure 6 This is a schematic diagram of the backrest structure in this invention.

[0021] Figure 7 This is a schematic diagram of the chair seat structure in this invention.

[0022] Figure 8 This is one of the schematic diagrams of the chair seat fixing structure in this invention.

[0023] Figure 9 This is the second schematic diagram of the chair seat fixing structure in this invention.

[0024] Figure 10 This is a schematic diagram of the plug-in component structure in this invention.

[0025] Figure 11 This is one of the schematic diagrams of the handrail structure in this invention.

[0026] Figure 12 This is the second schematic diagram of the handrail structure in this invention.

[0027] In the diagram: Base 1, Seat 2, Limiting block 200, Backrest 3, Backrest connecting seat 300, Fourth locking part 3000, First arc groove 3001, Annular boss 3002, Armrest 4, Second arc groove 400, Armrest end cover 401, Armrest mounting seat 402, Seat fixing seat 5, Third locking part 500, Limiting groove 501, Gear part 502, Insert / pull-out piece 6, First locking part 600, Second locking part 601, Connector 7, First screw 8, Torsion spring 9, Second screw 10, Elastic positioning bead 11. Detailed Implementation

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] Please see Figures 1-12A foldable backrest chair includes a base 1, a seat 2 mounted on the base 1, a backrest 3 mounted on the seat 2, and armrests 4. Backrest locking mechanisms are provided at both ends of the seat 2 and both ends of the backrest 3. Each backrest locking mechanism includes a seat fixing seat 5 mounted on the seat 2, a backrest connecting seat 300 mounted on the backrest 3 and rotatably connected to the seat fixing seat 5, and a plug-in assembly slidably inserted into the seat fixing seat 5 and the backrest connecting seat 300. The seat fixing seat 5 cannot rotate relative to the seat 2, and the backrest connecting seat... The backrest 300 rotates together with the backrest 3. The plug-in assembly has a locked state and an unlocked state. When the plug-in assembly is in the locked state, it is inserted into the backrest connecting seat 300 and the seat fixing seat 5 and locked in a locked engagement with the backrest connecting seat 300 and the seat fixing seat 5, so that the backrest connecting seat 300 cannot rotate relative to the seat fixing seat 5. When the plug-in assembly is in the unlocked state, it slides axially to disengage from the locked state with the backrest connecting seat 300 and the seat fixing seat 5, so that the backrest connecting seat 300 can rotate relative to the seat fixing seat 5.

[0030] Continue reading Figure 4 In one embodiment of the present invention, the plug-in assembly includes a plug-in member 6 that is slidably plugged into the seat fixing base 5 and a connector 7 that is slidably plugged into the backrest connecting base 300. The plug-in member 6 and the connector 7 are screwed together. Alternatively, the plug-in member 6 and the connector 7 can also be connected by conventional snap-fit ​​or screw.

[0031] Continue reading Figure 4 , Figure 7 , Figure 8 In one embodiment of the present invention, the seat fixing base 5 is inserted into the circular hole at the end of the seat 2 and is in circumferential upper limit engagement with the seat 2. A limiting block 200 is provided on the inner wall of the circular hole at the end of the seat 2, and a limiting groove 501 is provided on the outer wall of the seat fixing base 5 to engage with the limiting block 200. The engagement between the limiting block 200 and the limiting groove 501 prevents the seat fixing base 5 from rotating relative to the seat 2.

[0032] Continue reading Figure 4 In one embodiment of the present invention, the inner wall of the mounting hole of the chair seat fixing base 5 for mounting the plug-in component 6 is provided with a stop portion 502. The stop portion 502 is specifically an annular rib. Elastic positioning beads 11 are provided on both sides of the plug-in component 6. The elastic positioning beads 11 are in contact with the inner wall of the mounting hole of the plug-in component 6. When the elastic positioning beads 11 slide back and forth on the inner wall of the mounting hole, they can provide elastic damping for the plug-in component 6. The elastic positioning beads 11 are used to cooperate with the stop portion 502 to provide stop feedback for the sliding of the plug-in component 6. The elastic positioning beads 11 are also called spring positioning beads, spring glass beads, spring marbles, etc., and are composed of a housing, a spring, and a marble. Its structure is known technology and will not be described in detail.

[0033] Continue reading Figure 8 and Figure 10 In one embodiment of the present invention, one end of the plug-in member 6 extends from the seat fixing base 5 for operation. The plug-in member 6 is provided with a first engaging portion 600 and a second engaging portion 601 spaced apart along the axial direction. The seat fixing base 5 is provided with a third engaging portion 500. The backrest connecting base 300 is provided with an annular boss 3002. The connector 7 is inserted into the hole of the annular boss 3002. The annular boss 3002 is provided with a fourth engaging portion 3000. When the plug-in assembly is in the locked state, the first engaging portion 600 engages with the third engaging portion 500, and the second engaging portion 601 engages with the fourth engaging portion 3000. Specifically, the first engaging portion 600 and the second engaging portion 601 are locking teeth, and the third engaging portion 500 and the fourth engaging portion 3000 are toothed grooves that engage with the locking teeth. Alternatively, the first latching part 600 and the second latching part 601 can be designed as latching slots, and the third latching part 500 and the fourth latching part 3000 can be designed as corresponding latching teeth.

[0034] Continue reading Figure 4-Figure 6 In one embodiment of the present invention, the backrest connecting seat 300 is connected to the seat fixing seat 5 by a plurality of first screws 8. The backrest connecting seat 300 has a plurality of first arcuate grooves 3001 that are slidably connected to the first screws 8. The first arcuate grooves 3001 are used to limit the rotation angle of the backrest connecting seat 300 and the backrest 3. The first screws 8 are connected to screw holes on the seat fixing seat 5, and the backrest connecting seat 300 is pressed against the seat fixing seat 5 by the heads of the first screws 8. Due to the presence of the first arcuate grooves 3001, the backrest connecting seat 300 can rotate at a certain angle.

[0035] Continue reading Figure 4-Figure 6 In one embodiment of the present invention, a torsion spring 9 is provided between the backrest connecting seat 300 and the seat fixing seat 5. The torsion spring 9 is sleeved on the annular boss 3002 of the backrest connecting seat 300. One end of the torsion spring 9 is connected to the backrest connecting seat 300, and the other end is connected to the seat fixing seat 5. When the backrest 3 tilts forward, the backrest connecting seat 300 does not load the torsion spring 9, that is, it does not compress the torsion spring 9, so the torsion spring 9 does not provide a restoring force. When the backrest 3 tilts backward, the backrest connecting seat 300 loads the torsion spring 9, that is, it compresses the torsion spring 9, so that the torsion spring 9 provides a restoring force for the backrest 3.

[0036] Continue reading Figure 4-Figure 6In one embodiment of the present invention, the armrest 4 is rotatably connected to the backrest connecting seat 300 of the backrest 3. Specifically, the armrest 4 is connected to the backrest connecting seat 300 by a plurality of second screws 10. The armrest 4 has a plurality of second arcuate grooves 400 that are slidably connected to the second screws 10, and the second arcuate grooves 400 are used to limit the rotation angle of the armrest 4 relative to the backrest 3. The second screws 10 are connected to screw holes on the backrest connecting seat 300, and the armrest 4 is pressed against the backrest connecting seat 300 by the heads of the second screws 10. Due to the presence of the second arcuate grooves 400, the armrest 4 can rotate at a certain angle. The end of the armrest 4 is conventionally snapped into the armrest end cap 401. The rotation of the armrest 4 has conventional damping.

[0037] Assuming the seat is in Figure 1 In the state shown, the plug-in component 6 is simultaneously engaged with both the seat fixing base 5 and the backrest connecting base 300, and the elastic positioning bead 11 is blocked by the stop portion 502 on the seat fixing base 5 (to... Figure 4 For reference, at this time, the elastic positioning bead 11 should be located on the left side of the stop portion 502, and the insert 6 cannot easily move to the side opposite to the connector 7. When the backrest 3 needs to rotate, pull the insert 6 forcefully, so that the elastic positioning bead 11 passes over the stop portion 502 through the retraction of the ball, thereby separating the locking teeth on the insert 6 from the locking grooves on the seat fixing seat 5 and the backrest connecting seat 300. At this time, the backrest 3 can rotate freely, and the forward tilt rotation of the backrest 3 can be varied to... Figure 2 As shown, this configuration facilitates storage and packaging. The backrest 3 can also rotate backward. After rotating backward, the backrest 3 returns to its original position under the action of the torsion spring 9. Furthermore, rotating the backrest 3 backward does not cause the seat 2 to move, providing a better user experience. After determining the rotation angle of the backrest 3, insert the plug 6 back in, causing the elastic positioning bead 11 to return to the position blocked by the stop part 502. The locking teeth on the plug 6 then engage again with the locking slots on the seat fixing seat 5 and the backrest connecting seat 300, locking the angle of the backrest 3.

[0038] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A chair with a foldable backrest, comprising a base (1), a seat (2) disposed on the base (1), a backrest (3) disposed on the seat (2), and armrests (4), characterized in that, Backrest locking mechanisms are respectively provided at both ends of the seat (2) and both ends of the backrest (3). The backrest locking mechanism includes a seat fixing seat (5) on the seat (2), a backrest connecting seat (300) on the backrest (3) and rotatably connected to the seat fixing seat (5), and a plug-in component slidably inserted into the seat fixing seat (5) and the backrest connecting seat (300). The seat fixing seat (5) cannot rotate relative to the seat (2), the backrest connecting seat (300) rotates together with the backrest (3), and the plug-in component... It has a locked state and an unlocked state. When the plug-in component is in the locked state, it is inserted into the backrest connector (300) and the seat fixing seat (5) and locked in a locking engagement with the backrest connector (300) and the seat fixing seat (5), so that the backrest connector (300) cannot rotate relative to the seat fixing seat (5). When the plug-in component is in the unlocked state, it slides axially to disengage from the locked state with the backrest connector (300) and the seat fixing seat (5), so that the backrest connector (300) can rotate relative to the seat fixing seat (5).

2. A foldable backrest chair according to claim 1, characterized in that, The armrest (4) is rotatably connected to the backrest connecting seat (300) of the backrest (3).

3. A foldable backrest chair according to claim 2, characterized in that, The armrest (4) is connected to the backrest connecting seat (300) by a number of second screws (10). A number of second arc grooves (400) are provided on the armrest (4) and are slidably connected to the second screws (10). The second arc grooves (400) are used to limit the rotation angle of the armrest (4) relative to the backrest (3).

4. A foldable backrest seat according to claim 1, characterized in that, The seat fixing base (5) and the seat (2) are in a circumferential upper limit fit.

5. A foldable backrest chair according to claim 1, characterized in that, The seat fixing base (5) and / or backrest connecting base (300) are provided with a stop part (502) on the inner wall of the mounting hole for installing the plug-in assembly. The plug-in assembly is provided with an elastic positioning bead (11) for cooperating with the stop part (502).

6. A foldable backrest chair according to claim 1, characterized in that, The plug-in assembly is provided with a first latching part (600) and a second latching part (601) spaced apart. The seat fixing base (5) is provided with a third latching part (500). The backrest connecting base (300) is provided with a fourth latching part (3000). When the plug-in assembly is in the locked state, the first latching part (600) is engaged with the third latching part (500), and the second latching part (601) is engaged with the fourth latching part (3000). When the plug-in assembly is in the unlocked state, the first latching part (600) is separated from the third latching part (500) and the fourth latching part (3000).

7. A foldable backrest seat according to claim 1, characterized in that, One end of the plug-in assembly extends from the seat fixing base (5) for operation.

8. A foldable backrest chair according to claim 1, characterized in that, The backrest connecting seat (300) is connected to the seat fixing seat (5) by a number of first screws (8). The backrest connecting seat (300) has a number of first arc grooves (3001) that are slidably connected to the first screws (8). The first arc grooves (3001) are used to limit the rotation angle of the backrest connecting seat (300) and the backrest (3).

9. A foldable backrest seat according to claim 1, characterized in that, A torsion spring (9) is provided between the backrest connecting seat (300) and the seat fixing seat (5). When the backrest (3) tilts forward, the backrest connecting seat (300) does not load the torsion spring (9). When the backrest (3) tilts backward, the backrest connecting seat (300) loads the torsion spring (9) so that the torsion spring (9) provides elastic force for the backrest (3) to return to its original position.

10. A foldable backrest chair according to claim 1, characterized in that, The plug-in assembly includes a plug-in member (6) that is slidably plugged into the seat fixing base (5) and a connector (7) that is slidably plugged into the backrest connecting base (300), wherein the plug-in member (6) and the connector (7) are connected.

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