Linkage mechanism applied to three-section sofa bed

Abstract

The utility model discloses a linkage mechanism applied to a three-section sofa bed. The linkage mechanism comprises a first connecting rod assembly, a second connecting rod assembly, a third connecting rod assembly and a locking assembly. One side of the first connecting rod assembly is pivoted to the front-section sofa cushion, and the other side of the first connecting rod assembly is pivoted to the fixed bottom frame of the sofa frame. The first link assembly has a locking hole. And one end of the second connecting rod assembly is pivoted to the middle-section sofa cushion, and the other end is pivoted to the middle section of the first connecting rod assembly. And one side of the third connecting rod assembly is pivoted to the rear-section sofa cushion, and the other side of the third connecting rod assembly is pivoted to the pivoting position of the first connecting rod assembly and the fixed bottom frame. The locking assembly is arranged on one side, close to the front-section sofa cushion, of the first connecting rod assembly. The locking assembly comprises a locking rod, and the locking rod corresponds to the locking hole. Wherein the front-section sofa cushion rotates in a linkage mode through the first connecting rod assembly and is unfolded on one side of the middle-section sofa cushion, and the locking assembly is inserted into the locking hole through the inserting end of the locking rod so as to prevent the first connecting rod assembly from rotating again. According to the invention, the product safety can be greatly improved.

Description

Technical Field

[0001] This application relates to the technical field of bedding, and particularly to a linkage mechanism applied to a three-section sofa bed. Background Art

[0002] Modern home furnishings advocate simplicity. With the accelerating social development and the continuous increase in population, the limited nature of living space has become more obvious, and multi-functional furniture has increasingly become the choice of the public. The sofa bed is one of them. In small-sized apartments, in order to meet the occasional accommodation needs of visitors, a sofa bed is very necessary. Usually, the sofa bed can be placed in the living room or study to serve as a seat; at night when guests come, the sofa bed is unfolded and covered with bedding to become a sleeping bed. In ordinary housing types such as three-bedroom and two-living-room, the sofa bed can also help the host deal with the occasional visit of multiple guests in addition to the guest bedroom bed. There are various sofa beds on the market now, and the conversion methods between the sofa and the bed are also diverse, such as folding type, flipping type, stretching type. These sofa beds use various connecting mechanisms, which are mostly time-consuming and laborious during conversion, not very convenient to use, and there is no locking structure for the conversion between the sofa and the bed, which is likely to cause the problem of unstable unfolding of the sofa bed. Utility Model Content

[0003] In order to solve the above technical problems, the embodiments of this application provide a linkage mechanism applied to a three-section sofa bed. The specific technical solutions are as follows:

[0004] A linkage mechanism applied to a three-section sofa bed is provided, which includes a first link assembly, a second link assembly, a third link assembly and a locking assembly. The first link assembly is pivotally connected to the front-section sofa seat cushion on one side and to the fixed bottom frame of the sofa frame on the other side. The first link assembly has a locking hole. The front-section sofa seat cushion is folded and stored in the sofa frame or unfolded on one side of the middle-section sofa seat cushion through the linkage rotation of the first link assembly. The second link assembly is pivotally connected to the middle-section sofa seat cushion at one end and to the middle section of the first link assembly at the other end. The second link assembly drives the middle-section sofa seat cushion to be folded and stored in the sofa frame or unfolded on one side of the rear-section sofa seat cushion through the drive of the first link assembly. The third link assembly is pivotally connected to the rear-section sofa seat cushion on one side and to the pivotal connection position of the first link assembly and the fixed bottom frame on the other side. The third link assembly drives the rear-section sofa seat cushion to rise and fall through the drive of the first link assembly. The locking assembly is arranged on the side of the first link assembly close to the front-section sofa seat cushion. The locking assembly includes a locking rod, and the locking rod corresponds to the locking hole. When the front-section sofa seat cushion is unfolded on one side of the middle-section sofa seat cushion through the linkage rotation of the first link assembly, the locking assembly prevents the first link assembly from rotating again by inserting the insertion end of the locking rod into the locking hole.

[0005] In one embodiment, the first link assembly includes a first link and a second link. One end of the first link is pivotally connected to the front-section sofa cushion, and the other end is pivotally connected to the fixed chassis. The locking assembly is disposed on one side of the first link close to the front-section sofa cushion. The second link, corresponding to the first link, has one end pivotally connected to the front-section sofa cushion and the other end pivotally connected to the fixed chassis. The locking hole is located on the second link, and the front-section sofa cushion is folded and stored in the sofa frame or unfolded on one side of the middle-section sofa cushion through the linkage rotation of the first link and the second link. When the front-section sofa cushion is unfolded on one side of the middle-section sofa cushion, the locking assembly prevents the first link and the second link from rotating by inserting the insertion end of the locking rod into the locking hole.

[0006] In one embodiment, when the front-section sofa cushion is unfolded on one side of the middle-section sofa cushion through the linkage rotation of the first link and the second link, the side of the first link close to the front-section sofa cushion has a bearing section extending along the length direction of the front-section sofa cushion. The locking assembly is disposed on the bearing section. The pivot end of the second link and the front-section sofa cushion extends along the length direction of the front-section sofa cushion, and the locking hole is located at one end of the second link and the locking assembly.

[0007] In one embodiment, the locking assembly includes a fixing member and a first elastic member. The fixing member is fixedly disposed on the bearing section. The locking rod is inserted through the fixing member. A resisting member is disposed on one side of the locking rod close to the insertion end of the locking rod. The first elastic member is sleeved on the locking rod, and both ends of the first elastic member abut against the resisting member and the fixing member. The first elastic member is configured to drive the insertion end of the locking rod to insert into the locking hole.

[0008] In one embodiment, both sides of the locking hole of the second link are arc-shaped. During the process that the front-section sofa cushion is unfolded on one side of the middle-section sofa cushion through the linkage rotation of the first link and the second link, the insertion end of the second link slides into the locking hole through the arc segments on both sides of the locking hole of the second link.

[0009] In one embodiment, the locking assembly further includes an unlocking bump. The unlocking bump is disposed on the front-section sofa cushion and corresponds to the locking rod. One end of the locking rod opposite to its insertion end has a pull rod. The pull rod abuts against the side of the unlocking bump away from the locking hole, and the pull rod drives the insertion end to separate from the locking hole.

[0010] In one embodiment, during the process that the front-section sofa cushion is folded and stored in the sofa frame through the linkage rotation of the first link and the second link, the bearing section of the first link drives the pull rod of the locking rod to separate from the unlocking bump, and the first elastic member drives the insertion end of the locking rod to reset.

[0011] In one embodiment, the second link assembly includes a third link. One end of the third link is pivotally connected to the middle section of the first link, and the other end of the third link is pivotally connected to the middle section of the sofa cushion. The middle section of the sofa cushion is pivotally connected to the middle section of the second link. The first link and the second link drive the middle section of the sofa cushion to be folded and stored in the sofa frame or unfolded on one side of the rear section of the sofa cushion through the third link.

[0012] In one embodiment, the third link assembly includes a fourth link and a fifth link. The fourth link and the fifth link are corresponding and parallel to each other. One ends of the fourth link and the fifth link are pivotally connected to the rear section of the sofa cushion. The other end of the fourth link is pivotally connected to the pivotal connection position between the second link and the fixed chassis. The other end of the fifth link is pivotally connected to the fixed chassis. The second link assembly drives the rear section of the sofa cushion to lift through the linkage rotation of the fourth link and the fifth link.

[0013] In one embodiment, it further includes: a second elastic member, one end of which is pivotally connected to the fixed chassis, and the other end is pivotally connected to the rear section of the sofa cushion. The second elastic member is configured to provide assistance when the front section of the sofa cushion is folded and stored or unfolded.

[0014] In the embodiment of the present application, the front section of the sofa cushion is folded and stored in the sofa frame or unfolded on one side of the middle section of the sofa cushion through the linkage rotation of the first link assembly. The first link assembly simultaneously drives the middle section of the sofa cushion to be folded and stored in the sofa frame or unfolded on one side of the rear section of the sofa cushion through the second link assembly and drives the rear section of the sofa cushion to lift through the third link assembly. In this way, the opening or closing operation of the three-section sofa bed can be achieved in one step, with simple operation and a small structural volume, which can reduce the logistics cost. After the front section of the sofa cushion is unfolded, the locking assembly prevents the first link assembly from rotating again by inserting the insertion end of the locking rod into the locking hole, locking the linkage mechanism, and preventing the front section of the sofa cushion from being folded due to excessive load on the middle section and rear section of the sofa cushion, greatly improving the product safety. At the same time, the linkage mechanism applied to the three-section sofa bed in the present application adopts the installation form of three link assemblies, which can reduce the packaging space and facilitate transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0016] Figure 1 is a perspective view of the unfolded state of the linkage mechanism applied to the three-section sofa bed of the present application;

[0017] Figure 2 is a side view of the unfolded state of the linkage mechanism applied to the three-section sofa bed of the present application;

[0018] Figure 3 is a side view of the semi - deployed state of the linkage mechanism applied to a three - section sofa bed in the present application;

[0019] Figure 4 is a side view of the retracted state of the linkage mechanism applied to a three - section sofa bed in the present application;

[0020] Figure 5 is a schematic diagram of the deployed state of the iron frame of the three - section sofa bed in the present application;

[0021] Figure 6 is a schematic diagram of the state during the deployment process of the iron frame of the three - section sofa bed in the present application;

[0022] Figure 7 is a schematic diagram of the unlocked state of the iron frame of the three - section sofa bed in the present application;

[0023] Figure 8 and Figure 9 is a schematic diagram of the retraction process of the iron frame of the three - section sofa bed in the present application;

[0024] Figure 10 is a side view of the semi - deployed state of the iron frame of the three - section sofa bed in the present application. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0026] In addition, regarding the "first", "second", etc. used herein, they do not particularly refer to the order or sequence, nor are they used to limit the present application. They are merely used to distinguish components or operations described with the same technical terms.

[0027] Please refer to Figures 1 to 5 , Figure 1 is a perspective view of the deployed state of the linkage mechanism applied to a three - section sofa bed in the present application, Figure 2 is a side view of the deployed state, Figure 3 is a side view of the semi - deployed state, Figure 4 is a side view of the retracted state and Figure 5 is a schematic diagram of the deployed state of the iron frame of the three - section sofa bed in the present application; As shown in the figure, the linkage mechanism 1 applied to the three - section sofa bed in this embodiment includes a first link assembly 2, a second link assembly 3, a third link assembly 4, and a locking assembly 5. One side of the first link assembly 2 is pivotally connected to the front - section sofa cushion S1, and the other side of the first link assembly 2 is pivotally connected to the fixed bottom frame S101 of the sofa frame S10. AsFigure 3 As shown, the upper side of the first link assembly 2 is pivotally connected to the first iron frame S11 under the front-section sofa cushion S1, and the lower side of the first link assembly 2 is pivotally connected to the fixed bottom frame S101. The first link assembly 2 has a locking hole 201. The front-section sofa cushion S1 is linked and rotated by the first link assembly 2 to be folded and stored in the sofa frame S10 or unfolded on one side of the middle-section sofa cushion S2. One end of the second link assembly 3 is pivotally connected to the middle-section sofa cushion S2. The other end of the second link assembly 3 is pivotally connected to the middle section of the first link assembly 2. As Figure 3 shown, the upper side of the second link assembly 3 is pivotally connected to the second iron frame S21 under the middle-section sofa cushion S2, and the lower side of the second link assembly 3 is pivotally connected to the middle section of the first link assembly 2. The second link assembly 3 is driven to rotate by the first link assembly 2 to drive the middle-section sofa cushion S2 to be folded and stored in the sofa frame S10 or unfolded on one side of the rear-section sofa cushion.

[0028] As described above, one side of the third link assembly 4 is pivotally connected to the rear-section sofa cushion S3, and the other side of the third link assembly 4 is pivotally connected to the pivotal connection position of the first link assembly 2 and the fixed bottom frame S101. As Figure 3 shown, the upper side of the third link assembly 4 is pivotally connected to the third iron frame S31 under the rear-section sofa cushion S3, and the lower side of the third link assembly 4 is pivotally connected to the fixed bottom frame S101. The third link assembly 4 is driven to rotate by the first link assembly 2 to drive the rear-section sofa cushion S3 to move up and down. The locking assembly 5 is arranged on one side of the first link assembly 2 close to the front-section sofa cushion S1. The locking assembly 5 includes a locking rod 51. The locking rod 51 corresponds to the locking hole 201. When the front-section sofa cushion S1 is linked and rotated by the first link assembly 2 to be unfolded on one side of the middle-section sofa cushion S2, the locking assembly 5 prevents the first link assembly 2 from rotating again by inserting the insertion end 511 of the locking rod 51 into the locking hole 201, locking the first link assembly 2. When the insertion end 511 of the locking rod 51 is pulled out from the locking hole 201, the first link assembly 2 is unlocked.

[0029] Refer back to Figures 1 to 5As shown, when the linkage mechanism 1 applied to the three-section sofa bed is unfolded, the front-section sofa cushion S1 is linked and rotated by the first link assembly 2 and unfolded on one side of the middle-section sofa cushion S2. The first link assembly 2 simultaneously drives the middle-section sofa cushion S2 to unfold on one side of the rear-section sofa cushion S3 through the second link assembly 3 and drives the rear-section sofa cushion S3 to rise through the third link assembly 4, so that the opening operation of the three-section sofa bed 1 can be realized. Conversely, when the linkage mechanism 1 applied to the three-section sofa bed is folded, the front-section sofa cushion S1 is linked and rotated by the first link assembly 2 and folded and stored in the sofa frame S10. The first link assembly 2 simultaneously drives the middle-section sofa cushion S2 to be folded and stored in the sofa frame S10 through the second link assembly 3 and drives the rear-section sofa cushion S3 to descend through the third link assembly 4, so that the folding operation of the three-section sofa bed 1 can be realized. The linkage mechanism 1 applied to the three-section sofa bed in this embodiment realizes the opening or folding operation of the three-section sofa bed 1 through the linkage rotation of the first link assembly 2, the second link assembly 3, and the third link assembly 4. The operation is simple, and the packaging space can be reduced, and the logistics cost can be reduced. After the front-section sofa cushion S1 of the linkage mechanism 1 applied to the three-section sofa bed in this embodiment is unfolded, the locking assembly 5 prevents the first link assembly 2 from rotating again by inserting the insertion end 511 of the locking rod 51 into the locking hole 201, locking the linkage mechanism 1, and preventing the front-section sofa cushion S1 from being folded due to the excessive load of the middle-section sofa cushion S2 and the rear-section sofa cushion S3, greatly improving the product safety.

[0030] The following details the structure of the linkage mechanism 1 applied to the three-section sofa bed in this embodiment. Referring back to Figure 3 With Figure 5 As shown, the first link assembly 2 includes a first link 21 and a second link 22. One end of the first link 21 is pivotally connected to the front-section sofa cushion S1, and the other end of the first link 21 is pivotally connected to the fixed bottom frame S101. The locking assembly 5 is disposed on the side of the first link 21 close to the front-section sofa cushion S1. The second link 22 corresponds to the first link 21. One end of the second link 22 is pivotally connected to the front-section sofa cushion S1. The other end of the second link 22 is pivotally connected to the fixed bottom frame S101. In this embodiment, the upper ends of the first link 21 and the second link 22 are pivotally connected to the first iron frame S11, and the lower ends of the first link 21 and the second link 22 are pivotally connected to the fixed bottom frame S101. The locking hole 201 is located on the second link 22. The front-section sofa cushion S1 is folded and stored in the sofa frame S10 or unfolded on one side of the middle-section sofa cushion S2 through the linkage rotation of the first link 21 and the second link 22. When the front-section sofa cushion S1 is unfolded on one side of the middle-section sofa cushion S2, the locking assembly 5 prevents the first link 21 and the second link 22 from rotating by inserting the insertion end 511 of the locking rod 51 into the locking hole 201.

[0031] Referring back to Figure 5As shown, when the current-section sofa cushion S1 is unfolded on one side of the middle-section sofa cushion S2 through the linkage rotation of the first link 21 and the second link 22, the side of the first link 21 close to the front-section sofa cushion S1 has a bearing section 211 extending along the length direction of the front-section sofa cushion S1. The locking assembly 5 is arranged on the bearing section 211. The pivot end of the second link 22 and the front-section sofa cushion S1 extends along the length direction of the front-section sofa cushion S1. The locking hole 201 is located at one end of the second link 22 and the locking assembly 5. The locking assembly 5 makes its insertion end 511 inserted into the locking hole 201 by driving the locking rod 51 to move towards the locking hole 201. In this embodiment, the locking assembly 5 includes a fixing member 52 and a first elastic member 53. The fixing member 52 is fixedly arranged on the bearing section 211. The locking rod 51 is passed through the fixing member 52. A resisting member 512 is arranged on the side of the locking rod 51 close to the insertion end 511 of the locking rod 51. The first elastic member 53 is sleeved on the locking rod 51. Both ends of the first elastic member 53 abut against the resisting member 512 and the fixing member 52. The first elastic member 53 is configured to drive the insertion end 511 of the locking rod 51 to be inserted into the locking hole 201. The first elastic member 53 uses a spring.

[0032] Please refer to Figure 6 And at the same time refer to Figure 5 As shown, Figure 6 is a schematic diagram of the unfolding process state of the iron frame of the three-section sofa bed of the present application; as shown in the figure, both sides of the locking hole 201 of the second link 22 are arc-shaped. During the process that the front-section sofa cushion S1 is unfolded on one side of the middle-section sofa cushion S2 through the linkage rotation of the first link 21 and the second link 22, the insertion end 511 of the second link 22 slides into the locking hole 201 through the arc segments 221 on both sides of the locking hole 201 of the second link 22. Specifically, as Figure 1 shown, during the linkage rotation and unfolding process of the first link 21 and the second link 22, the arc segment 221 below the locking hole 201 abuts against the insertion end 511 of the locking rod 51, pushing the insertion end 511 to move towards the side away from the locking hole 201 and compressing the first elastic member 53. After the insertion end 511 of the locking rod 51 slides along the arc segment 221 to correspond to the locking hole 201, as Figure 5 shown, the first elastic member 53 resets and pushes the insertion end 511 of the second link 22 into the locking hole 201.

[0033] Please refer to Figure 7 And at the same time refer to Figure 5 As shown, Figure 7 is a schematic diagram of the unlocking state of the iron frame of the three-section sofa bed of the present application; as shown in the figure, in this embodiment, the locking assembly 5 further includes an unlocking convex block 54. The unlocking convex block 54 is arranged on the front-section sofa cushion S1 and corresponds to the locking rod 51. As Figure 5As shown, the unlocking bump 54 is located above the bearing section 211. One end of the locking rod 51 opposite to its insertion end 511 has a pull rod 513. The locking rod 51 and the pull rod 513 form a "﹂"-shaped rod. By driving the insertion end 511 of the locking rod 51 to move away from the locking hole 201 through the pull rod 513, the insertion end 511 is pulled out from the locking hole 201. After the pull rod 513 moves to the position of the unlocking bump 54, the pull rod 513 is rotated so that the pull rod 513 abuts against the side of the unlocking bump 54 away from the locking hole 201, and the pull rod 513 drives the insertion end 511 to separate from the locking hole 201. Please also refer to Figure 8 and Figure 9 , which is a schematic diagram of the folding process of the iron frame of the three-section sofa bed of the present application; as shown, during the process that the front-section sofa cushion S1 is folded and stored in the sofa frame S10 through the linkage rotation of the first link 21 and the second link 22, the bearing section 211 of the first link 21 drives the pull rod 513 of the locking rod 51 to separate from the unlocking bump 54, and the first elastic member 53 drives the insertion end 511 of the locking rod 51 to reset. The reset state here refers to the state when the insertion end 511 of the locking rod 51 is inserted into the locking hole 201.

[0034] Refer back again Figure 3 As shown, the second link assembly 3 includes a third link 31. One end of the third link 31 is pivotally connected to the middle section of the first link 21. The other end of the third link 31 is pivotally connected to the middle-section sofa cushion S2, and the middle-section sofa cushion S2 is pivotally connected to the middle section of the second link 22. As Figure 1 shown, the lower end of the third link 31 is pivotally connected to the middle section of the first link 21, and the upper end of the third link 31 is pivotally connected to the second iron frame S21. The first link 21 and the second link 22 drive the middle-section sofa cushion S2 to be folded and stored in the sofa frame S10 or unfolded on one side of the rear-section sofa cushion S3 through the third link 31.

[0035] Refer back again Figure 3 and Figure 5 shown, the third link assembly 4 includes a fourth link 41 and a fifth link 42. The fourth link 41 and the fifth link 42 are corresponding and parallel to each other. One end of the fourth link 41 and the fifth link 42 is pivotally connected to the rear-section sofa cushion S3. As Figure 1 shown, the upper ends of the fourth link 41 and the fifth link 42 are pivotally connected to the third iron frame S31. The other end of the fourth link 41 is pivotally connected to the pivotal connection position of the second link 22 and the fixed bottom frame S101. The other end of the fifth link 42 is pivotally connected to the fixed bottom frame S101. The second link assembly 3 drives the rear-section sofa cushion S3 to lift through the linkage rotation of the fourth link 41 and the fifth link 42.

[0036] Please refer to Figure 10 and at the same time refer to Figures 2 to 4 shown, Figure 10It is a side view of the semi-expanded state of the iron frame of the three-section sofa bed of the present application; as shown in the figure, the linkage mechanism 1 applied to the three-section sofa bed in this embodiment further includes a second elastic member 6. One end of the second elastic member 6 is pivotally connected to the fixed bottom frame S101, and the other end of the second elastic member 6 is pivotally connected to the rear-section sofa cushion S3. The second elastic member is configured to provide assistance when the front-section sofa cushion S1 is folded and stored or unfolded. As Figure 2 shown, one end of the second elastic member 6 is pivotally connected to the left side of the fixed bottom frame S101, and the other end of the second elastic member 6 is pivotally connected to the left side of the rear-section sofa cushion S3. When the linkage mechanism 1 is in the deployed state, the second elastic member 6 is in a compressed state to provide assistance for the storage of the linkage mechanism 1. As Figure 3 shown Figure 10 in, when the linkage mechanism 1 is stored to the semi-expanded state, the second elastic member 6 is in an unloaded state, and at the same time, as the linkage mechanism 1 continues to be stored, it will be compressed again. As Figure 4 shown, when the linkage mechanism 1 is in the stored state, the second elastic member 6 is in a compressed state to provide assistance for the deployment of the linkage mechanism 1. The second elastic member 6 uses a gas spring.

[0037] In summary, the present application provides a linkage mechanism applied to a three-section sofa bed. The front-section sofa cushion is folded and stored in the sofa frame or unfolded on one side of the middle-section sofa cushion through the linkage rotation of the first link assembly. The first link assembly simultaneously drives the middle-section sofa cushion to be folded and stored in the sofa frame or unfolded on one side of the rear-section sofa cushion through the second link assembly and drives the rear-section sofa cushion to rise and fall through the third link assembly. In this way, the opening or closing operation of the three-section sofa bed can be completed in one step, with simple operation and a small structural volume, which can reduce the logistics cost. After the front-section sofa cushion is unfolded, the locking assembly prevents the first link assembly from rotating again by inserting the insertion end of the locking rod into the locking hole, locks the linkage mechanism, and prevents the front-section sofa cushion from being folded due to the excessive load of the middle-section sofa cushion and the rear-section sofa cushion, greatly improving the product safety. At the same time, the linkage mechanism applied to the three-section sofa bed in the present application adopts the installation form of three link assemblies, which can reduce the packaging space and facilitate transportation.

[0038] It should be noted that in this article, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including that element.

[0039] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative rather than restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them fall within the protection scope of the present application.

Claims

1. A linkage mechanism applied to a three-section sofa bed, characterized in that: include: A first connecting rod assembly, one side of which is pivotally connected to the front sofa cushion, and the other side of which is pivotally connected to the fixed bottom frame of the sofa frame. The first connecting rod assembly has a locking hole, and the front sofa cushion is folded and stored in the sofa frame or unfolded on one side of the middle sofa cushion through the linkage rotation of the first connecting rod assembly; A second connecting rod assembly, one end of which is pivotally connected to the middle section sofa cushion, and the other end of which is pivotally connected to the middle section of the first connecting rod assembly, the second connecting rod assembly is driven to rotate by the first connecting rod assembly to drive the middle section sofa cushion to be folded and stored in the sofa frame or unfolded on one side of the rear section sofa cushion; A third connecting rod assembly, one side of which is pivotally connected to the rear sofa cushion, and the other side of which is pivotally connected to the pivotal position of the first connecting rod assembly and the fixed base frame, and the third connecting rod assembly is driven to rotate by the first connecting rod assembly to drive the rear sofa cushion to rise and fall; A locking assembly is arranged on a side of the first connecting rod assembly close to the front sofa cushion, and the locking assembly includes a locking rod, which corresponds to the locking hole, wherein the front sofa cushion is unfolded on one side of the middle sofa cushion through the linkage rotation of the first connecting rod assembly, and the locking assembly prevents the first connecting rod assembly from rotating again by inserting the plug-in end of the locking rod into the locking hole.

2. The linkage mechanism for a three-section sofa bed according to claim 1, characterized in that: The first connecting rod assembly comprises: A first connecting rod, one end of which is pivotally connected to the front sofa cushion, and the other end of which is pivotally connected to the fixed base frame, and the locking assembly is arranged on a side of the first connecting rod close to the front sofa cushion; The second connecting rod corresponds to the first connecting rod, one end of which is pivotally connected to the front section sofa cushion, and the other end is pivotally connected to the fixed base frame. The locking hole is located on the second connecting rod. The front section sofa cushion is folded and stored in the sofa frame or unfolded on one side of the middle section sofa cushion through the linkage rotation of the first connecting rod and the second connecting rod, wherein the front section sofa cushion is unfolded on one side of the middle section sofa cushion, and the locking component prevents the first connecting rod and the second connecting rod from rotating by inserting the plug-in end of the locking rod into the locking hole.

3. The linkage mechanism applied to a three-section sofa bed according to claim 2, characterized in that: When the front section sofa cushion is unfolded on one side of the middle section sofa cushion through the linkage rotation of the first connecting rod and the second connecting rod, the first connecting rod has a bearing section extending along the length direction of the front section sofa cushion on one side close to the front section sofa cushion, and the locking assembly is arranged on the bearing section. The pivot end of the second connecting rod and the front section sofa cushion extends along the length direction of the front section sofa cushion, and the locking hole is located at one end of the second connecting rod and the locking assembly.

4. The linkage mechanism for a three-section sofa bed according to claim 3, characterized in that: The locking assembly includes a fixing member and a first elastic member, the fixing member is fixedly arranged on the bearing section, the locking rod is passed through the fixing member, a stopper is arranged on the side of the locking rod close to the plug-in end of the locking rod, the first elastic member is sleeved on the locking rod, the two ends of the first elastic member abut against the stopper and the fixing member, and the first elastic member is configured to drive the plug-in end of the locking rod to insert into the locking hole.

5. The linkage mechanism applied to a three-section sofa bed according to claim 4, characterized in that: Both sides of the locking hole of the second connecting rod are arc-shaped. When the front section sofa cushion is unfolded on one side of the middle section sofa cushion through the linkage rotation of the first connecting rod and the second connecting rod, the plug-in end of the second connecting rod slides into the locking hole through the arc sections on both sides of the locking hole of the second connecting rod.

6. The linkage mechanism for a three-section sofa bed according to claim 4, characterized in that: The locking assembly also includes an unlocking protrusion, which is arranged on the front section sofa cushion and corresponds to the locking rod. The locking rod has a pull rod at one end opposite to its plug-in end, wherein the pull rod is buckled on the side of the unlocking protrusion away from the locking hole, and the pull rod drives the plug-in end to separate from the locking hole.

7. The linkage mechanism for a three-section sofa bed according to claim 6, characterized in that: When the front section sofa cushion is folded and stored in the sofa frame through the linkage rotation of the first connecting rod and the second connecting rod, the bearing section of the first connecting rod drives the pull rod of the locking rod to separate from the unlocking protrusion, and the first elastic member drives the plug-in end of the locking rod to reset.

8. The linkage mechanism applied to a three-section sofa bed according to claim 2, characterized in that: The second link assembly includes a third link, one end of the third link is pivotally connected to the middle section of the first link, the other end of the third link is pivotally connected to the middle section sofa cushion, and the middle section sofa cushion is pivotally connected to the middle section of the second link, and the first link and the second link drive the middle section sofa cushion to be folded and stored in the sofa frame or unfolded on one side of the rear section sofa cushion via the third link.

9. The linkage mechanism applied to a three-section sofa bed according to claim 2, characterized in that: The third link assembly includes a fourth link and a fifth link, the fourth link corresponds to the fifth link and is parallel to each other, one end of the fourth link and the fifth link is pivotally connected to the rear section sofa cushion, the other end of the fourth link is pivotally connected to the pivot position of the second link and the fixed base frame, the other end of the fifth link is pivotally connected to the fixed base frame, and the second link assembly drives the rear section sofa cushion to rise and fall through the linkage rotation of the fourth link and the fifth link.

10. The linkage mechanism applied to a three-section sofa bed according to claim 1, characterized in that: Also includes: A second elastic member has one end pivotally connected to the fixed base frame and the other end pivotally connected to the rear sofa cushion. The second elastic member is configured to provide assistance when the front sofa cushion is folded, stored or unfolded.

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