Sofa chair backrest frame

Abstract

The utility model provides a backrest frame of a sofa chair, which relates to the technical field of sofa seats and comprises a moving plate, the moving plate is rotatably connected with the lower end of a first linkage plate, and the upper end of the first linkage plate is rotatably connected with a support plate; the supporting plate is rotationally connected with the upper end of the second linkage plate, and the middle of the second linkage plate is rotationally connected to the moving plate. The movable plate, the first linkage plate, the supporting plate and the second linkage plate form a closed loop in a surrounding mode, and the size of the area formed by the closed loop in a surrounding mode can change along with movement of the movable plate. A first limiting piece is arranged on the movable plate, and the first limiting piece intersects with the rotating plane of the first linkage plate. The chair has the advantages that the backrest frame is provided with the moving plate, the first linkage plate, the supporting plate and the second linkage plate, and the four plates form a linkage supporting structure; and the first limiting piece, the second limiting piece and the third limiting piece are arranged, so that the sofa chair backrest frame can be limited in the folded state and the unfolded state respectively, and the stability of the structure is enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of sofa seats, in particular to a backrest frame of a sofa seat. Background Art

[0002] With the improvement of living standards, people have higher and higher requirements for the comfort of sofa seats. In addition to meeting the basic seating functions, many sofa seats on the market now have added functions such as footrests and backrests. In order to save space, the footrests and backrests can be retracted or extended to meet people's needs for different sitting postures.

[0003] Chinese patent publication number CN 220192598 U discloses a seat cushion and footrest linkage mechanism for a sofa chair frame, wherein the structure of the backrest is: "The backrest assembly includes a first backrest connector, a second backrest connector, a third backrest connector and a fourth backrest connector, and the first backrest connector, the second backrest connector, the third backrest connector and the fourth backrest connector are interconnected to form a closed loop" and only further discloses the specific structure of the "first backrest connector" and the "second backrest connector" and the connection relationship between the components. However, it does not disclose that the components of the backrest assembly have a limiting structure, which may easily lead to relatively poor stability of the structure.

[0004] Based on this, it is necessary to disclose a novel sofa chair backrest frame to overcome the above-mentioned defects. Utility Model Content

[0005] The utility model overcomes the shortcomings of the prior art and provides a sofa chair backrest frame with simple structure and good stability.

[0006] In order to solve the above technical problems, the utility model is achieved through the following technical solutions:

[0007] A sofa chair backrest frame comprises a moving plate, wherein the moving plate is rotatably connected to the lower end of a first linkage plate, and the upper end of the first linkage plate is rotatably connected to a supporting plate; the supporting plate is rotatably connected to the upper end of a second linkage plate, and the middle part of the second linkage plate is rotatably connected to the moving plate; the moving plate, the first linkage plate, the supporting plate and the second linkage plate are surrounded to form a closed loop, and the size of the area surrounded by the closed loop changes with the movement of the moving plate; a first limiting member is arranged on the moving plate, and the first limiting member intersects with the rotation plane of the first linkage plate.

[0008] Furthermore, the lower end of the second linkage plate is rotatably connected to the third linkage plate, and the lower end of the third linkage plate is provided with a first connecting hole; the second linkage plate is protrudingly provided with a second limiter near the lower end, and the second limiter intersects with the rotation plane of the third linkage plate.

[0009] Furthermore, it comprises a reinforcing plate, one end of which is rotatably connected to the first linkage plate, and the other end of which is rotatably connected to the second linkage plate.

[0010] Furthermore, a third position-limiting member is protrudingly provided at a portion of the second linkage plate close to the upper end, and the third position-limiting member intersects with the rotation plane of the reinforcing plate.

[0011] Furthermore, the support plate has an extension section, and an angle is formed between the extension section and the horizontal plane; when the first linkage plate is docked and restricted on the first limit member, the angle is the largest, and when the reinforcement plate is docked and restricted on the third limit member, the angle is the smallest.

[0012] Furthermore, the extending direction of the extending section is opposite to the forward moving direction of the moving plate.

[0013] Furthermore, the movable plate is provided with a second connecting hole.

[0014] Compared with the prior art, the beneficial effects of the utility model are:

[0015] The utility model sofa chair backrest frame comprises a movable plate, a first linkage plate, a supporting plate and a second linkage plate, and the above four form a linkage supporting structure; and has a first limiting member, a second limiting member and a third limiting member, which respectively have limiting effects on the sofa chair backrest frame in the two states of folding and unfolding, thereby enhancing the stability of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 is a general view of the sofa chair backrest frame of the present embodiment, in a retracted state;

[0018] Figure 2 yes Figure 1 A schematic diagram of a sofa chair backrest frame in a state installed on a sofa chair;

[0019] Figure 3 is a general view of the sofa chair backrest frame of the present embodiment, in an unfolded state;

[0020] Figure 4 yes Figure 3 Schematic diagram of a sofa chair backrest frame in a state installed on a sofa chair.

[0021] In the figure:

[0022] 1. Moving plate; 101. First position-limiting member; 102. Second connecting hole; 2. First linkage plate; 3. Support plate; 301. Extension section; 4. Second linkage plate; 401. Second position-limiting member; 402. Third position-limiting member; 5. Third linkage plate; 501. First connecting hole; 6. Reinforcing plate. DETAILED DESCRIPTION

[0023] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0024] like Figures 1 to 4 As shown, the utility model provides a sofa chair backrest frame, which is a part of the sofa chair frame, specifically, includes a movable plate 1, the movable plate 1 is rotatably connected to the lower end of the first linkage plate 2, and the upper end of the first linkage plate 2 is rotatably connected to the support plate 3; the support plate 3 is rotatably connected to the upper end of the second linkage plate 4, and the middle part of the second linkage plate 4 is rotatably connected to the movable plate 1; in the above structure, the support plate 3 is used to fix the sofa backrest, and the movable plate 1 is fixed on the movable rod of the sofa chair frame. The movement of the movable rod drives the movable plate 1 to move, and finally the inclination of the angle of the support plate 3 changes, that is, the angle of the sofa backrest changes.

[0025] In order to enhance the fixing effect with the sofa backrest, the support plate 3 has an extension section 301 to increase the fixing area between the support plate 3 and the sofa backrest; the extension direction of the extension section 301 is opposite to the forward moving direction of the movable plate 1, so that the sofa backrest itself has a reclining effect, making the reclining comfortable, and when the movable plate 1 moves forward, the sofa backrest will rotate and tilt backward accordingly.

[0026] The movable plate 1, the first linkage plate 2, the support plate 3, and the second linkage plate 4 are surrounded to form a closed loop, and the size of the area surrounded by the closed loop will change with the movement of the movable plate 1; the movable plate 1 is provided with a first limiter 101, and the first limiter 101 intersects with the rotation plane of the first linkage plate 2; the first limiter 101 and the second limiter 401 and the third limiter 402 mentioned below are all nail-shaped and protrude from the surface to achieve the effect of limiting; combined with Figure 1 as well as Figure 2 It can be seen that when the backrest frame is retracted, the first linkage plate 2 will rotate clockwise with the connection point with the movable plate 1 as the center, and the first limit member 101 limits the further rotation of the first linkage plate 2; when the first linkage plate 2 is docked at the first limit member 101, the backrest frame is in a retracted state.

[0027] The lower end of the second linkage plate 4 is rotatably connected to the third linkage plate 5, and the lower end of the third linkage plate 5 is provided with a first connection hole 501; the first connection hole 501 is used to allow the lower end of the third linkage plate 5 to be rotatably connected to the sofa chair frame; the second linkage plate 4 is protrudingly provided with a second stopper 401 near the lower end, and the second stopper 401 intersects with the rotation plane of the third linkage plate 5. Figure 1 As shown, when the backrest frame is in the retracted state, the second limiting member 401 limits further rotation between the second linkage plate 4 and the third linkage plate 5, thereby achieving the purpose of limiting and making the structure stable at this time.

[0028] The reinforcing plate 6 includes one end of which is rotatably connected to the first linkage plate 2, and the other end of which is rotatably connected to the second linkage plate 4; a third stopper 402 is protrudingly provided near the upper end of the second linkage plate 4, and the third stopper 402 intersects with the rotation plane of the reinforcing plate 6. Figures 1 to 3 During conversion, the backrest frame changes from the stowed state to the unfolded state, and the first linkage plate 2 rotates counterclockwise, thereby pulling the reinforcement plate 6 to move until the third limit member 402 limits the reinforcement plate 6 from further movement. At this time, it is in a fully unfolded state; due to the limiting effect of the third limit member 402, the state at this time is also stable.

[0029] An angle is formed between the extension section 301 and the horizontal plane; when the first linkage plate 2 is parked and restricted on the first limit member 101, the angle is the largest at this time, that is, in the state of Figure 1 In the state shown, the sofa backrest is at its steepest, suitable for a person to sit and lean back; when the reinforcing plate 6 is parked and restricted on the third limiter 402, the angle is the smallest, that is, it is in the state shown in FIG. Figure 3 In the state shown, the sofa backrest is the flattest and suitable for human body to lie down.

[0030] The movable plate 1 is provided with a second connecting hole 102 for fixing with a bolt to the movable rod of the sofa chair frame.

[0031] The sofa chair backrest frame of the utility model has a first limiting member 101, a second limiting member 401 and a third limiting member 402, which respectively have limiting functions for the sofa chair backrest frame in both the folded and unfolded states, thereby enhancing the stability of the structure.

[0032] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A sofa chair backrest frame, characterized in that: The invention comprises a moving plate (1), wherein the moving plate (1) is rotatably connected to the lower end of a first linkage plate (2), and the upper end of the first linkage plate (2) is rotatably connected to a support plate (3); the support plate (3) is rotatably connected to the upper end of a second linkage plate (4), and the middle part of the second linkage plate (4) is rotatably connected to the moving plate (1); the moving plate (1), the first linkage plate (2), the support plate (3), and the second linkage plate (4) are surrounded to form a closed loop, and the size of the area surrounded by the closed loop changes with the movement of the moving plate (1); The movable plate (1) is provided with a first limiting member (101), and the first limiting member (101) intersects with the rotation plane of the first linkage plate (2); the lower end of the second linkage plate (4) is rotatably connected to the third linkage plate (5), and the lower end of the third linkage plate (5) is provided with a first connection hole (501); a second limiting member (401) is protrudingly provided at a portion near the lower end of the second linkage plate (4), and the second limiting member (401) intersects with the rotation plane of the third linkage plate (5); It comprises a reinforcing plate (6), one end of which is rotatably connected to the first linkage plate (2), and the other end of which is rotatably connected to the second linkage plate (4); A third position-limiting member (402) is protrudingly provided at a position close to the upper end of the second linkage plate (4), and the third position-limiting member (402) intersects with the rotation plane of the reinforcing plate (6).

2. The sofa chair backrest frame according to claim 1, characterized in that: The support plate (3) has an extension section (301), and an angle is formed between the extension section (301) and the horizontal plane; when the first linkage plate (2) is parked and restricted on the first limit member (101), the angle is maximum, and when the reinforcement plate (6) is parked and restricted on the third limit member (402), the angle is minimum.

3. The sofa chair backrest frame according to claim 2, characterized in that: The extending direction of the extending section (301) is opposite to the forward moving direction of the moving plate (1).

4. The sofa chair backrest frame according to claim 1, characterized in that: The movable plate (1) is provided with a second connection hole (102).

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