Mechanical stretching device for seat

Abstract

The utility model relates to a seat mechanical stretching device which is characterized in that the seat mechanical stretching device is composed of a seat installation plate, a backrest installation 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 installed on the front portion of the seat installation plate, and the upper end of the rear portion of the seat installation plate is hinged to the backrest installation rod which is hinged to one end of the backrest supporting rod; one end of a first connecting rod is hinged to the seat mounting plate, the other end of the first connecting rod is hinged to one end of a third connecting rod, the other end of the third connecting rod is hinged to the fixing plate, one end of a second connecting rod is hinged to the fixing plate, and the other end of the second connecting rod is hinged to the leg assembly through a leg assembly driving shaft. A first support is arranged on the second connecting rod and is matched with the fixing plate; a second support is arranged in the middle of the third connecting rod and sleeved with the second support mounting groove, and the seat mounting plate is limited to be matched with the first connecting rod. The structure is simplified, the cost is saved, and the cushion is prevented from being damaged.

Description

Technical Field

[0001] The present application relates to a seat mechanical extension device, which is mainly suitable for the design of a manually controlled seat mechanical extension device. Background Art

[0002] The prior art is referred to the utility model patent publication document of China Patent Publication No. CN209121640U, which is titled "Electric Sofa Linkage Device". Its main defects are: 1. The structure is relatively complex and the cost is high; 2. The sofa cushion is mounted on the cushion mounting member 2, and a spring is provided inside the sofa cushion. When the push rod motor 63 drives the push rod 62 to move forward, as shown in FIG. Figure 3 、 Figure 4 As shown, the hinged joint of the rotating push rod 52 and the lower fixing member 53 protrudes upwards and is higher than the upper plane of the cushion mounting member 2. At this moment, the hinged joint of the rotating push rod 52 and the lower fixing member 53 can withstand the sofa cushion, thereby the sofa cushion can be damaged. Summary of the Invention

[0003] The technical problem solved by the present application is to overcome the above-mentioned deficiencies in the prior art and to provide a manually controlled seat mechanical extension device that simplifies the structure, saves costs, and avoids damage to the sofa cushion.

[0004] The technical solution adopted by the present application to solve the above technical problems is: a seat mechanical extension device, which is characterized by: consisting of 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 limiter, a seat back hinge shaft, and a seat first connecting rod hinge shaft; the leg assembly is installed at the front of the seat mounting plate; the rear upper end of the seat mounting plate is hinged to the backrest mounting rod through the seat back hinge shaft; the backrest mounting rod is hinged to one end of the backrest support rod through the 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 The shaft is hinged on the seat mounting plate, the other end of the first link is hinged to one end of the third link, the other end of the third link is hinged to the fixed plate through the third link mounting shaft, one end of the second link is hinged to the fixed plate through the second link mounting shaft, the other end of the second link is hinged to the leg assembly through the leg assembly driving 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 sitting and TV postures; a second support is provided in the middle of the third link, the second support is sleeved in the second support mounting slot of the fixed plate, the seat mounting plate limit is cooperated with the first link, and is used to support the rear load of the limit seat mounting plate in TV posture and lying posture.

[0005] The backrest mounting rod of the present application is also provided with a backrest limiter, which cooperates with the Ω-shaped support edge of the backrest support rod and always fits into the Ω-shaped support edge during the state change process, thereby assisting in positioning the relative position of the backrest mounting rod and the backrest support rod.

[0006] The first connecting rod of the present application is L-shaped. In the TV posture and lying position, the line connecting the limit center point of the seat mounting plate and the center point of the hinge axis of the third connecting rod is roughly located in the middle of the L-shaped vertical section, which is conducive to 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 piece. One end of leg link 1 and one end of leg link 2 are hinged on 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 piece, the other end of the footrest mounting piece 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 limit is provided on leg link 4, and the middle part of leg link 2 is hinged to the second link through the leg assembly drive shaft.

[0008] The second support installation groove is a waist-shaped groove with a length direction in the up-down direction.

[0009] Compared with the prior art, the present application has the following advantages and effects: simplified structure, cost saving, and avoidance of damage to the sofa cushion. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is an inner side view of the embodiment of the present application in a sitting position.

[0011] Figure 2 It is a three-dimensional schematic diagram of an embodiment of the present application in a TV posture.

[0012] Figure 3 It is an inner view of the embodiment of the present application in the TV posture.

[0013] Figure 4 It is a three-dimensional schematic diagram of the embodiment of the present application in a lying state.

[0014] Figure 5 It is an inner side view of the embodiment of the present application in a lying position.

[0015] In the picture:

[0016] 1. Seat mounting plate; 11. Seat mounting plate limiter; 12. Seat backrest hinge axis; 13. Seat first link hinge axis; 2. Backrest mounting rod; 21. Backrest limiter; 22. Backrest adjustment axis; 3. Backrest support rod; 31. Ω-shaped support edge; 4. Fixed plate; 41. Second support mounting slot; 42. Third link mounting axis; 43. Second link mounting axis; 5. First link; 6. Second link; 61. First support; 62. Leg assembly drive shaft; 7. Third link; 71. Third link hinge axis; 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 piece. DETAILED DESCRIPTION

[0017] The present application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are intended to explain the present application but the present application is not limited to the following examples. Figure 1 The middle left is the front and the right is the back.

[0018] See also Figures 1 to 5 The seat mechanical extension device of the embodiment of the present application is composed of a seat mounting plate 1, a backrest mounting rod 2, a backrest support rod 3, a fixed 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 limit 11, a seat back hinge shaft 12, and a seat first connecting rod hinge shaft 13. The leg assembly 8 is installed at 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 through the backrest adjustment shaft 22. The other end of the backrest support rod 3 is mounted on the fixed plate 4. One end of the first connecting rod 5 is hinged to the seat mounting plate 1. 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 fixed plate 4 through the third connecting rod mounting shaft 42. One end of the second connecting rod 6 is hinged to the second connecting rod 6 through the second connecting rod mounting shaft 42. The mounting shaft 43 is hinged on the fixed plate 4, and the other end of the second connecting rod 6 is hinged to the leg assembly 8 through the leg assembly driving shaft 63. The second connecting rod 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 postures; a second support 72 is provided in the middle of the third connecting rod 7, and the second support 72 is sleeved in the second support mounting groove 41 of the fixed plate 4, which limits the relative positions of the third connecting rod 7, the first connecting rod 5, and the rear of the seat mounting plate 1 in the lying position, and the seat mounting plate limit 11 cooperates with the first connecting rod 5, and is used to support and limit the rear load of the seat mounting plate 1 in the TV posture and lying position.

[0019] The backrest mounting rod 2 of the present application is also provided with a backrest limiter 21, which cooperates with the Ω-shaped support edge 31 of the backrest support rod 3, and always fits into the Ω-shaped support edge 31 during the state change process, thereby assisting in positioning the relative position of the backrest mounting rod 2 and the backrest support rod 3.

[0020] In the present application, the first connecting rod 5 is L-shaped. In the TV posture and lying posture, the line connecting the center point of the seat mounting plate limit 11 and the center point of the third connecting rod hinge shaft 71 is roughly located in the middle of the L-shaped vertical section, which is conducive to supporting the rear load of the seat mounting plate 1.

[0021] Two devices of the present application are symmetrically mounted on a seat frame via a fixing plate 4 and a footrest is installed, thereby forming a posture-adjustable seat, such as a pushchair.

[0022] The leg assembly includes a leg link 1 81, a leg link 2 82, a leg link 3 83, a leg link 4 84, a leg link 5 85, a leg link 6 86, and a footrest mounting piece 87. One end of the leg link 1 81 and one end of the leg link 2 82 are hinged on the seat mounting plate 1, the other end of the leg link 1 81 is hinged to one end of the leg link 3 83, the other end of the leg link 3 83 is hinged to one end of the footrest mounting piece 87, and the other end of the footrest mounting piece 87 is hinged to one end of the leg link 6 86. Then, the other end of leg link six 86 is hinged to one end of leg link five 85, the middle part of leg link five 85 is hinged to the middle part of leg link three 83, the other end of leg link five 85 is hinged to one end of leg link four 84, the middle part of leg link four 84 is hinged to the middle part of leg link one 81, the other end of leg link four 84 is hinged to the other end of leg link two 82, and a leg assembly limit 841 is provided on leg link four 84, and the middle part of leg link two 82 is hinged to the second link 6 through the leg assembly drive shaft 62.

[0023] The main work process of this application is as follows:

[0024] In the sitting position, if the user wants to adjust to the TV posture, he only needs to push the armrests (not shown in the figure, the armrests are installed on the fixing plate 4) with both hands, lean back, so that the seat mounting plate 1 moves backward until the seat mounting plate limit 11 contacts the first connecting rod 5 and is located above its front, entering the TV posture state, see Figures 1 to 3 When the user wants to adjust to a lying position in the TV posture, he presses his back backward against the upper part of the backrest mounting rod 2, so that the backrest mounting rod 2 tilts backward and downward around the seat back hinge shaft 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 upward, and then the user enters the lying position. Figure 5When returning to the TV posture from the lying position, the user only needs to hold the armrests with both hands and release the pressure on the backrest mounting rod 2. The body pressure causes the seat mounting plate 1, the second connecting rod 6, and the rear part of the third connecting rod 7 to move downward until the second support 72 is located at the lower part of the second support mounting groove 41 to support the second connecting rod 6, and then return to the TV posture state; when the TV posture state changes to the sitting position, the user hooks the footrest mounting part 87 with his feet and holds the armrests with both hands for support, driving the leg assembly 8 to retract until the leg assembly limit 841 touches the leg connecting rod 1 81, and then returns to the sitting position.

[0025] The technical contents not described in detail in this application are all prior art.

Claims

1. A mechanical seat extension device, characterized by: The seat frame is composed of 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 limiter, a seat back hinge shaft, and a seat first connecting rod hinge shaft. The leg assembly is installed at the front of the seat mounting plate. The upper end of the rear of the seat mounting plate is hinged to the backrest mounting rod through the seat back hinge shaft. The backrest mounting rod is hinged to one end of the backrest support rod through the 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 to the seat mounting plate through the seat first connecting rod hinge shaft. The other end of the first connecting rod It is hinged to one end of the third link, and the other end of the third link is hinged to the fixed plate through the third link mounting shaft. One end of the second link is hinged to the fixed plate through the second link mounting shaft, and the other end of the second link is hinged to the leg assembly through the leg assembly driving 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 position and TV position; a second support is provided in the middle of the third link, and the second support is sleeved in the second support mounting groove of the fixed plate. The seat mounting plate limiter cooperates with the first link and is used to support the rear load of the seat mounting plate in the TV position and lying position.

2. The seat mechanical extension device according to claim 1, characterized in that: The backrest mounting rod is also provided with a backrest limiter, which cooperates with the Ω-shaped supporting edge of the backrest support rod.

3. The seat mechanical extension device according to claim 2, characterized in that: The first connecting rod is L-shaped, and the line connecting the limiting center point of the seat mounting plate and the center point of the hinge axis of the third connecting rod is located in the middle of the L-shaped vertical section in the TV posture and the lying posture.

4. The seat mechanical extension device according to claim 1, characterized in that: 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 piece. One end of leg link 1 and one end of leg link 2 are hinged on 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 piece, the other end of the footrest mounting piece 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 limit is provided on leg link 4, and 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 installation groove is a waist-shaped groove with a length direction in the up-down direction.

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