Seat mechanical extension device

Abstract

The present application relates to a seat mechanical extension device, comprising a seat mounting plate, a backrest mounting rod, a backrest supporting rod, a fixing plate, a first connecting rod, a second connecting rod, a third connecting rod, and a leg assembly. The leg assembly is mounted at the front of the seat mounting plate; the upper end of the back of the seat mounting plate is hingedly connected to the backrest mounting rod; the backrest mounting rod is hingedly connected to one end of the backrest supporting rod, and the other end of the backrest supporting rod is mounted on the fixing plate; one end of the first connecting rod is hingedly connected to the seat mounting plate, the other end of the first connecting rod is hingedly connected to one end of the third connecting rod, and the other end of the third connecting rod is hingedly connected to the fixing plate; one end of the second connecting rod is hingedly connected to the fixing plate, and the other end of the second connecting rod is hingedly connected to the leg assembly by means of a leg assembly driving shaft; a first support is provided on the second connecting rod and works in conjunction with the fixing plate; a second support is provided at the middle of the third connecting rod; the second support is sleeved in a second support mounting slot; a seat mounting plate limiting structure works in conjunction with the first connecting rod. The present application achieves a simplified structure, saves the cost, and avoids damage to sofa seat cushions.

Description

Seat mechanical extension device Technical Field

[0001] This application relates to a seat mechanical extension device, which is mainly applicable to the design of manually controlled seat mechanical extension devices. Background Technology

[0002] The existing technology can be found in the utility model patent publication document with Chinese patent publication number CN209121640U, entitled "Electric Sofa Linkage Device". Its main drawback is that a sofa cushion is mounted on the cushion mounting component 2, and a spring is installed inside the cushion. When the push rod motor 63 drives the push rod 62 forward, the hinge between the rotating push rod 52 and the lower fixing component 53 protrudes upward and exceeds the upper plane of the cushion mounting component 2. At this time, the hinge between the rotating push rod 52 and the lower fixing component 53 will press against the sofa cushion, thereby damaging the sofa cushion. Summary of the Invention

[0003] The technical problem solved by this application is to overcome the above-mentioned deficiencies in the prior art and to provide a manually controlled mechanical extension device for a seat, so as to avoid damage to the sofa cushion.

[0004] The technical solution adopted by this application to solve the above-mentioned technical problems is as follows: a seat mechanical extension device, including a seat mounting plate, a backrest mounting rod, a backrest support rod, a fixed plate, a first connecting rod, a second connecting rod, a third connecting rod, and a leg assembly. The seat mounting plate is provided with a seat mounting plate limiting structure, a seat backrest hinge shaft, and a seat first connecting rod hinge shaft. The leg assembly is mounted on the front part of the seat mounting plate. The upper rear part of the seat mounting plate is hinged to the backrest mounting rod through the seat backrest hinge shaft. The backrest mounting rod is hinged to one end of the backrest support rod through a backrest adjustment shaft. The other end of the backrest support rod is mounted on the fixed plate. One end of the first connecting rod is hinged through the seat first connecting rod hinge shaft. Attached to the seat mounting plate, the other end of the first link is hinged to one end of the third link, and the other end of the third link is hinged to the fixed plate via the third link mounting shaft. One end of the second link is hinged to the fixed plate via the second link mounting shaft, and the other end of the second link is hinged to the leg assembly via the leg assembly drive shaft. A first support is provided on the second link and cooperates with the fixed plate. The first support is used to support the front load of the seat mounting plate in the sitting and TV positions. A second support is provided in the middle of the third link. The second support is fitted into the second support mounting groove of the fixed plate. The seat mounting plate limiting structure cooperates with the first link to support and limit the rear load of the seat mounting plate in the TV and reclining positions.

[0005] The backrest mounting rod of this application is also provided with a backrest limiting structure. The backrest limiting structure cooperates with the Ω-shaped support edge of the backrest support rod and always fits the Ω-shaped support edge during the state change process, which helps to position the relative position of the backrest mounting rod and the backrest support rod.

[0006] In this application, the first link is L-shaped. When in TV posture or reclining posture, the line connecting the center point of the seat mounting plate limit and the center point of the hinge axis of the third link is approximately located in the middle of the vertical segment of the L-shape, which is beneficial for supporting the load at the rear of the seat mounting plate.

[0007] The leg assembly includes leg link 1, leg link 2, leg link 3, leg link 4, leg link 5, leg link 6, and a footrest mounting component. One end of leg link 1 and one end of leg link 2 are hinged to the seat mounting plate. The other end of leg link 1 is hinged to one end of leg link 3. The other end of leg link 3 is hinged to one end of the footrest mounting component. The other end of the footrest mounting component is hinged to one end of leg link 6. The other end of leg link 6 is hinged to one end of leg link 5. The middle part of leg link 5 is hinged to the middle part of leg link 3. The other end of leg link 5 is hinged to one end of leg link 4. The middle part of leg link 4 is hinged to the middle part of leg link 1. The other end of leg link 4 is hinged to the other end of leg link 2. A leg assembly limiting structure is provided on leg link 4. The middle part of leg link 2 is hinged to the second link through the leg assembly drive shaft.

[0008] The second support mounting groove is an oblong groove with its length direction running vertically.

[0009] Compared with the prior art, this application has the following advantages and effects: avoiding damage to sofa cushions. Attached Figure Description

[0010] Figure 1 is an inside view of an embodiment of this application in a seated position.

[0011] Figure 2 is a three-dimensional schematic diagram of the embodiment of this application in the TV pose state.

[0012] Figure 3 is an inside view of an embodiment of this application in the TV pose state.

[0013] Figure 4 is a three-dimensional schematic diagram of the embodiment of this application in a lying position.

[0014] Figure 5 is an inside view of an embodiment of this application in a lying position.

[0015] In the diagram: 1. Seat mounting plate; 11. Seat mounting plate limiter; 12. Seat backrest hinge shaft; 13. Seat first link hinge shaft; 2. Backrest mounting rod; 21. Backrest limiter; 22. Backrest adjustment shaft; 3. Backrest support rod; 31. Ω-shaped support edge; 4. Fixing plate; 41. Second support mounting groove; 42. Third link mounting shaft; 43. Second link mounting shaft; 5. First link; 6. Second link; 61. First support; 62. Leg assembly drive shaft; 7. Third link; 71. Third link hinge shaft; 72. Second support; 8. Leg assembly; 81. Leg link one; 82. Leg link two; 83. Leg link three; 84. Leg link four; 841. Leg assembly limiter; 85. Leg link five; 86. Leg link six; 87. Footrest mounting component. Detailed Implementation

[0016] The present application will be further described in detail below with reference to the accompanying drawings and embodiments. The following embodiments are explanations of the present application, but the present application is not limited to the following embodiments. In Figure 1, the left side is the front and the right side is the rear.

[0017] Referring to Figures 1-5, the seat mechanical extension device of this embodiment includes a seat mounting plate 1, a backrest mounting rod 2, a backrest support rod 3, a fixing plate 4, a first connecting rod 5, a second connecting rod 6, a third connecting rod 7, and a leg assembly 8. The seat mounting plate 1 is provided with a seat mounting plate limiting structure 11, a seat backrest hinge shaft 12, and a seat first connecting rod hinge shaft 13. The leg assembly 8 is mounted on the front of the seat mounting plate 1. The upper rear end of the seat mounting plate 1 is hinged to the backrest mounting rod 2. The backrest mounting rod 2 is hinged to one end of the backrest support rod 3 via a backrest adjustment shaft 22. The other end of the backrest support rod 3 is mounted on the fixing plate 4. One end of the first connecting rod 5 is hinged to the seat mounting plate 1, and the other end of the first connecting rod 5 is hinged to one end of the third connecting rod 7. The other end of the third connecting rod 7 is hinged to the fixing plate 4 via a third connecting rod mounting shaft 42. One end of the second connecting rod 6 is connected to the second connecting rod... The mounting shaft 43 is hinged to the fixed plate 4. The other end of the second link 6 is hinged to the leg assembly 8 via the leg assembly drive shaft 63. The second link 6 is provided with a first support 61 and cooperates with the fixed plate 4. The first support 61 is used to support the front load of the seat mounting plate 1 in sitting and TV positions. The third link 7 is provided with a second support 72 in the middle. The second support 72 is fitted in the second support mounting groove 41 of the fixed plate 4. When in a lying position, it limits the relative position of the third link 7, the first link 5, and the rear of the seat mounting plate 1. The seat mounting plate limiting structure 11 cooperates with the first link 5 and is used to support and limit the rear load of the seat mounting plate 1 in TV and lying positions.

[0018] The backrest mounting rod 2 of this application is also provided with a backrest limiting structure 21. The backrest limiting structure 21 cooperates with the Ω-shaped support edge 31 of the backrest support rod 3 and always fits the Ω-shaped support edge 31 during the state change process, which helps to position the relative position of the backrest mounting rod 2 and the backrest support rod 3.

[0019] In this application, the first link 5 is L-shaped. When in the TV position or reclining position, the line connecting the center point of the seat mounting plate limit 11 and the center point of the hinge axis 71 of the third link is approximately located in the middle of the vertical section of the L-shape, which is beneficial for supporting the rear load of the seat mounting plate 1.

[0020] Two devices of this application are symmetrically mounted on the seat frame via a fixing plate 4 and a footrest is installed, thus forming a posture-adjustable seat, such as a push chair.

[0021] The leg assembly includes leg link 1 81, leg link 2 82, leg link 3 83, leg link 4 84, leg link 5 85, leg link 6 86, and footrest mounting component 87. One end of leg link 1 81 and one end of leg link 2 82 are hinged to the seat mounting plate 1. The other end of leg link 1 81 is hinged to one end of leg link 3 83. The other end of leg link 3 83 is hinged to one end of footrest mounting component 87. The other end of footrest mounting component 87 is hinged to one end of leg link 6 86. The other end of leg link 6 86 is hinged to one end of leg link 5 85. The middle part of leg link 5 85 is hinged to the middle part of leg link 3 83. The other end of leg link 5 85 is hinged to one end of leg link 4 84. The middle part of leg link 4 84 is hinged to the middle part of leg link 1 81. The other end of leg link 4 84 is hinged to the other end of leg link 2 82. A leg component limiting structure 841 is provided on leg link 4 84. The middle part of leg link 2 82 is hinged to the second link 6 through the leg component drive shaft 62.

[0022] The main work process of this application is as follows:

[0023] In the seated position, if the user wants to adjust to the TV position, they only need to push the armrests (not shown in the figure, the armrests are mounted on the fixed plate 4) with both hands and lean back, causing the seat mounting plate 1 to move backward until the seat mounting plate limiting structure 11 contacts the first connecting rod 5 and is located above its front, thus entering the TV position, see Figures 1 to 3. When the user wants to adjust to the reclining position from the TV position, they press their back against the upper part of the backrest mounting rod 2, causing the backrest mounting rod 2 to tilt backward and downward around the seat backrest hinge axis 12, and the seat mounting plate 1 moves backward and upward until the second support 72 moves upward to the upper part of the second support mounting groove 41 and cannot move further, thus entering the reclining position, see Figure 5. When returning from a reclining position to a TV position, the user simply holds onto the armrests with both hands, releasing the pressure on the backrest mounting rod 2. The body pressure causes the seat mounting plate 1, the second link 6, and the third link 7 to move downwards until the second support 72 is positioned under the second support mounting groove 41, supporting the second link 6, thus returning to the TV position. When changing from the TV position to a sitting position, the user hooks their feet onto the footrest mounting piece 87, holds onto the armrests for support, and retracts the leg assembly 8 until the leg assembly limit 841 contacts the leg link 81, returning to the sitting position. This prevents the hinge structure from pressing against the sofa cushion in practical applications, thus avoiding damage to the sofa cushion.

[0024] All technical contents not described in detail in this application are prior art.

Claims

1. A seat mechanical extension device, comprising: The system comprises a seat mounting plate, a backrest mounting rod, a backrest support rod, a fixed plate, a first connecting rod, a second connecting rod, a third connecting rod, and a leg assembly. The seat mounting plate includes a seat mounting plate limiting structure, a seat backrest hinge shaft, and a seat first connecting rod hinge shaft. The leg assembly is mounted on the front of the seat mounting plate. The upper rear end of the seat mounting plate is hinged to the backrest mounting rod via the seat backrest hinge shaft. The backrest mounting rod is hinged to one end of the backrest support rod via a backrest adjustment shaft, and the other end of the backrest support rod is mounted on the fixed plate. One end of the first connecting rod is hinged to the seat mounting plate via the seat first connecting rod hinge shaft, and the other end of the first connecting rod is... One end of the third link is hinged, and the other end of the third link is hinged to the fixed plate via the third link mounting shaft. One end of the second link is hinged to the fixed plate via the second link mounting shaft, and the other end of the second link is hinged to the leg assembly via the leg assembly drive shaft. A first support is provided on the second link and cooperates with the fixed plate. The first support is used to support the front load of the seat mounting plate in the sitting and TV positions. A second support is provided in the middle of the third link. The second support is fitted into the second support mounting groove of the fixed plate. The seat mounting plate limiting structure cooperates with the first link and is used to support and limit the rear load of the seat mounting plate in the TV and reclining positions.

2. The seat mechanical extension device according to claim 1, wherein: The backrest mounting rod is also provided with a backrest limiting structure, which cooperates with the Ω-shaped support edge of the backrest support rod.

3. The seat mechanical extension device according to claim 2, wherein: The first link is L-shaped, and the line connecting the center point of the seat mounting plate limit and the center point of the hinge axis of the third link is located in the middle of the vertical segment of the L-shape when in TV posture or reclining posture.

4. The seat mechanical extension device according to claim 1, wherein: The leg assembly includes leg link 1, leg link 2, leg link 3, leg link 4, leg link 5, leg link 6, and a footrest mounting component. One end of leg link 1 and one end of leg link 2 are hinged to the seat mounting plate. The other end of leg link 1 is hinged to one end of leg link 3. The other end of leg link 3 is hinged to one end of the footrest mounting component. The other end of the footrest mounting component is hinged to one end of leg link 6. The other end of leg link 6 is hinged to one end of leg link 5. The middle part of leg link 5 is hinged to the middle part of leg link 3. The other end of leg link 5 is hinged to one end of leg link 4. The middle part of leg link 4 is hinged to the middle part of leg link 1. The other end of leg link 4 is hinged to the other end of leg link 2. A leg assembly limiting structure is provided on leg link 4. The middle part of leg link 2 is hinged to the second link through the leg assembly drive shaft.

5. The seat mechanical extension device according to claim 1, characterized in that: The second support mounting groove is an oblong groove with its length direction running vertically.

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