Linkage device, bracket, seat unit, and seat for achieving zero backrest clearance

Abstract

The linkage device, bracket, seat unit, and seat for realizing zero backrest clearance include a base (1), a linkage mechanism (2), a bracket side plate (3), and a backrest mechanism (4). The linkage mechanism (2) is pivotally connected between the base (1) and the bracket side plate (3), and the backrest mechanism (4) is pivotally connected to the bracket side plate (3) and the linkage mechanism (2). The bracket side plate (3) is provided with a side plate interlocking point (31) and a backrest point (32). The bracket side plate (3) is pivotally connected to the linkage mechanism (2) at the side plate interlocking point (31). The bracket side plate (3) is pivotally connected to the backrest mechanism (4) at the backrest point (32). The backrest mechanism (4) includes a backrest mounting member (41) and a backrest interlocking member (42). When the backrest mechanism (4) is contracted to the limit position, the included angle α between the line connecting both end points of the backrest mounting member (41) and the line connecting the backrest point (32) and the side panel linking point (31) is an acute angle. The seat bracket can meet the design of various styles of seat backrests (5), and the seat backrest (5) of the seat unit can be installed leaning against a wall with zero clearance, saving space and improving aesthetics.

Description

[Technical field]

[0001] The present invention relates to the technical field of seat brackets, and more particularly to a linkage device, a bracket, a seat unit, and a seat for achieving zero backrest clearance. [Background technology]

[0002] Multifunctional sofas and seats have become a widely used piece of furniture in smart home life. Multifunctional sofas can usually be adjusted into a retracted position for a normal seated posture, an extended position with only the legs extended, and a sleeping position with both the legs and back fully extended.

[0003] In the prior art, when the seat backrest is placed against a wall, when the backrest mechanism rotates backward to a lying position, the seat backrest comes into contact with the adjacent wall, interfering with the rotation of the backrest mechanism, and it is necessary to secure a space for the backrest to extend, which occupies a large space. In the existing functional seats that can be placed against a wall with zero clearance, the extension of the legs and the backrest is limited, and the angle adjustment of the backrest mechanism and the seat backrest is limited, which makes the seat less comfortable. Existing seat backrests with backrest adjustment function are only available in a single style. Summary of the Invention

[0004] The present invention aims to solve the problems of the prior art, such as the seat backrest occupying a large space, not being able to be installed against a wall with zero clearance, or the backrest angle adjustment being limited, resulting in poor comfort.

[0005] In order to achieve the above object, the present application provides a linkage device for achieving zero backrest clearance, the linkage device including a base, a linkage mechanism, a bracket side plate, and a backrest mechanism, the linkage mechanism being pivotally connected between the base and the bracket side plate, and the backrest mechanism being pivotally connected to the bracket side plate and the linkage mechanism, respectively. The bracket side plate is provided with a side plate linkage point and a backrest point, and the bracket side plate is rotatably connected to the linkage mechanism at the side plate linkage point, and the bracket side plate is rotatably connected to the backrest mechanism at the backrest point. The backrest mechanism includes a backrest mounting member and a backrest linkage member, both ends of which are rotatably connected between the backrest point and the backrest linkage member, and when the backrest mechanism is contracted to its limit position, the included angle α between a line connecting the two end points of the backrest mounting member and a line connecting the backrest point and the side panel linkage point is an acute angle.

[0006] Furthermore, the bracket side plate includes a backrest connecting portion and an L-shaped side plate main body, and the side plate main body is integrally formed with or fixedly connected to the backrest connecting portion.

[0007] Furthermore, the backrest connection portion is disposed at one end of the bracket side plate that is connected to the backrest mechanism, and the backrest point is disposed at the backrest connection portion.

[0008] Furthermore, when the backrest mechanism is contracted to its limit position, the included angle α between a line connecting both end points of the backrest mounting member and a line connecting the backrest point and the side panel interlocking point is less than 70°.

[0009] Furthermore, when the backrest mechanism is extended to its limit position, the angle β between a line connecting both end points of the backrest mounting member and a line connecting the backrest point and the side panel linkage point is less than 45°.

[0010] Furthermore, the backrest mounting member is provided with a protruding frame mounting portion, the frame mounting portion being used to mount a seat backrest of a seat, and when the linkage device is extended to its limit position, the included angle γ between the frame mounting portion and a horizontal plane is 35° or less.

[0011] The present application further provides a seat bracket, the seat bracket including a base, a linkage mechanism, a bracket side plate, and a backrest mechanism, the linkage mechanism being pivotally connected between the base and the bracket side plate, and the backrest mechanism being pivotally connected to the bracket side plate and the linkage mechanism, respectively. The linkage mechanism includes a first support member, a swing member, an intermediate connecting member, an interlocking member, and a second support member. The first support member and the second support member are pivotally connected to opposite ends of the base, respectively, the swing member is connected to the first support member, and opposite ends of the intermediate connecting member are connected to the swing member and the interlocking member, respectively. The interlocking member is provided with an interlocking point and a support connection point. The interlocking member is connected to the intermediate connection member at the interlocking point. The interlocking member is connected to the second support member at the support connection point. A line connecting the interlocking point and the support connection point is L1, and a line connecting the connection point between the second support member and a base and the support connection point is L2. When the linkage mechanism (2) is extended to its limit position, the included angle δ between L1 and L2 is 8° to 15°.

[0012] Furthermore, when the linkage mechanism is extended forward to its limit position, the included angle ε between the second support member and a horizontal plane is less than 42°.

[0013] Furthermore, the distance from the interlocking point to the support connection point is A1, the distance from the support connection point to the connection point between the second support member and the base is A2, and the ratio of A1 to A2 is in the range of 0.6 to 0.75.

[0014] Furthermore, the interlocking member is further provided with a side panel connection point and a back connection point. The side panel connection point is used for connecting with the bracket side panel. The back connection point is used for connecting with the backrest mechanism. During the extension and retraction of the linkage mechanism, a distance H3 from the back connection point to the bottom surface of the base is 3 cm or more.

[0015] Furthermore, the pivoting member is provided with a first connection point, a second connection point, and a third connection point. The pivoting member is rotatably connected to the first support member at the first connection point, and is rotatably connected to the bracket side plate at the third connection point. A distance from the second connection point to the third connection point is B1, a distance from the second connection point to the first connection point is B2, and a ratio of B1 to B2 is in a range of 0.6 to 0.7.

[0016] Furthermore, an included angle θ between a line connecting the second connection point and the third connection point and a line connecting the second connection point and the first connection point is an acute angle.

[0017] The seat unit further includes a drive mechanism and a leg mechanism, the leg mechanism being pivotally connected to the front of the bracket side plate and the linkage mechanism, the drive mechanism drives the leg mechanism to extend and retract, thereby moving and adjusting the linkage mechanism, the bracket side plate and the backrest mechanism to move the seat bracket between the positions of the seated posture, the extended posture and the lying posture.

[0018] The present application further provides a seat unit, the seat unit including a base, a linkage mechanism, a bracket side plate, a backrest mechanism, and a seat backrest, the linkage mechanism being pivotally connected between the base and the bracket side plate, the backrest mechanism being pivotally connected to the bracket side plate and the linkage mechanism, respectively. A seat frame mounting surface is provided on the outer surface of the bracket side plate. The height of the plane on which the seat frame mounting surface is located is lower than the upper edge of the bracket side plate, and the distance H from the highest point of the seat frame mounting surface to the bottom surface of the base is 16 cm to 19 cm. The backrest mechanism includes a backrest mounting member and a backrest interlocking member. The backrest mounting member is rotatably connected to the bracket side plate. Both ends of the backrest interlocking member are rotatably connected to the backrest mounting member and a linkage mechanism, respectively. The backrest mounting member is connected to the seat backrest. The seat backrest includes a backrest tail edge. When the seat bracket is contracted to a limit position, a plane perpendicular to a horizontal plane on which the backrest tail edge is located is set as an initial plane, and when the backrest mechanism moves together with the linkage mechanism and the bracket side plate between a contraction limit position and an extension limit position, the rearward movement of the backrest tail edge does not exceed the initial plane.

[0019] The seat backrest further includes a backrest tail and a main body. The backrest tail edge is located at the rear edge of the backrest tail, and the backrest tail has a width greater than that of the main body. During the process of the backrest mechanism rotating the seat backrest, the backrest tail can rotate around the seat armrest.

[0020] Furthermore, when the seat backrest is contracted to its limit position, a distance H1 from the rear edge of the backrest to the bottom surface of the base is 70 cm to 85 cm.

[0021] Furthermore, when the seat backrest is extended to its limit position, a distance H2 from the rear edge of the backrest to the bottom surface of the base is 50 cm to 65 cm.

[0022] The present application further provides a seat, which includes a seat armrest and the above-mentioned seat unit, wherein the seat unit is fixed to an inner side of the seat armrest via a bracket side plate.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] By limiting the angular relationship between the backrest connection portion and the backrest mounting member, the present invention enables the distance that the linkage mechanism and the bracket side plate cause the backrest mechanism to translate forward and upward during the extension process to offset the distance caused by the backrest mechanism rotating backward, under conditions that ensure the extension length of the seat, so that the seat backrest can be positioned against a wall with zero clearance, thereby further saving space.

[0025] The linkage mechanism of the present invention further extends the forward extension distance of the seat bracket by optimizing the connection angle and dimensional ratio of the parts, and the combination of the linkage mechanism and the reduced height of the seat frame mounting surface further lowers the seat height and improves structural stability.

[0026] The seat backrest of the present invention may be a T-shaped frame structure with a wide backrest tail. Compared with the traditional floor-mounted armrest product, the T-shaped seat backrest allows the backrest tail to rotate around the seat armrests on both sides during the extension of the seat unit, and the seat armrests move together with the side plate linkage members, increasing the area of ​​the seat backrest. The seat backrest can also be used for seat styles with floor-mounted armrests. The design of the seat backrest and seat armrest is more flexible, can meet various styles of seat designs, and the appearance is more aesthetic. [Brief description of the drawings]

[0027] In order to describe the embodiments of the present invention or the technical means of the prior art in more detail, the following briefly describes the drawings necessary for describing the embodiments or the prior art. Of course, the drawings in the following description are only some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without performing creative labor. [Figure 1] 2 is a schematic diagram of the structure of a seat bracket according to the present embodiment. FIG. [Diagram 2] 2 is a structural schematic diagram of a linkage mechanism and a backrest mechanism according to the present embodiment. FIG. [Diagram 3] FIG. 2 is a structural schematic diagram of a linkage mechanism according to the present embodiment. [Figure 4] FIG. 2 is another side view of FIG. 1. [Diagram 5] 1 is a schematic diagram of the structure of a seat bracket extended to a limit position according to the present embodiment; FIG. [Figure 6] 3 is a schematic diagram of a connection structure between a transmission mechanism and a drive mechanism of the seat bracket according to the present embodiment. FIG. [Figure 7] 3 is a schematic diagram of a connection structure of a transmission mechanism of the seat bracket according to the present embodiment. FIG. [Figure 8] 3A to 3C are schematic diagrams showing the structural positions of the seat unit in a seated position and a lying position according to the present embodiment. [Figure 9] 1 is a structural schematic diagram of a seat unit having a T-shaped seat backrest according to the present embodiment. FIG. [Figure 10] 1 is a structural schematic diagram of a floor-mounted armrest-equipped seat unit according to an embodiment of the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0028] In order to make the objectives, technical means and advantages of the present invention clearer, the present invention will be described in more detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely illustrative and do not limit the scope of the present invention.

[0029] In describing the present invention, it is to be understood that terms such as "first", "second", etc. are used for descriptive purposes only and should not be construed as indicating or implying a relative importance or number of technical features being presented, such that a feature qualified by "first", "second" may explicitly or implicitly include one or more of said features.

[0030] In addition, in the present invention, unless otherwise clearly specified and limited, the terms "attached", "connected" and the like should be understood in a broad sense, for example, fixed connection, detachable connection, or integral connection. It may be mechanical connection or electrical connection. It may be direct connection, indirect connection via an intermediate medium, or internal communication between two elements. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific situation.

[0031] Working Example This embodiment specifically provides a seat for a typical posture-adjustable sofa, leisure chair, massage chair, etc. The seat includes a seat unit attached to the inside of the seat armrest for adjusting the posture of the seat. The seat unit allows the seat to move between the positions of a sitting posture, an extended posture, and a lying posture. Here, in the sitting posture state, both the leg mechanism and the backrest mechanism of the seat unit are fully contracted to their limit positions. In the extended posture, the leg mechanism extends forward, and the angle between the backrest mechanism and the seat frame does not change. In the lying posture state, the leg mechanism extends forward to its limit position, and the backrest mechanism extends backward to its limit position. In this embodiment, the direction in which the leg mechanism of the seat extends is defined as "forward", and the opposite direction is defined as "rear".

[0032] Specifically, in this embodiment, the distance caused by the backward rotation of the backrest mechanism during extension can be offset by the linkage mechanism and the bracket side plate moving the backrest mechanism forward and upward in parallel, and the space behind the backrest mechanism can be saved to the maximum extent, so that the seat backrest can be placed close to the adjacent object behind with zero clearance, and can also be placed from zero against the wall, and can be extended to the sleeping position without any obstacles. Here, "zero clearance" refers to the effect of saving space.

[0033] As shown in Figures 1 to 5, a linkage device for achieving zero backrest clearance provided by an embodiment of the present invention includes a base 1, a linkage mechanism 2, a bracket side plate 3, and a backrest mechanism 4, wherein the linkage mechanism 2 is rotatably connected between the base 1 and the bracket side plate 3, and the backrest mechanism 4 is rotatably connected to the bracket side plate 3 and the linkage mechanism 2, respectively.

[0034] Specifically, the bracket side plate 3 is provided with a backrest point 32 and a side plate interlocking point 31. The bracket side plate 3 is rotatably connected to the linkage mechanism 2 at the side plate interlocking point 31. The bracket side plate 3 is rotatably connected to the backrest mechanism 4 at the backrest point 32. The backrest mechanism 4 includes a backrest mounting member 41 and a backrest interlocking member 42. Both ends of the backrest mounting member 41 are rotatably connected between the backrest point 32 and the backrest interlocking member 42. When the backrest mechanism 4 is contracted to the limit position, the included angle α between the line connecting the both end points of the backrest mounting member 41 and the line connecting the backrest point 32 and the side plate interlocking point 31 is an acute angle.

[0035] Specifically, as shown in Figures 1, 2 and 4, when the backrest mechanism 4 is contracted to the limit position, the included angle α between the line connecting both end points of the backrest mounting member 41 and the line connecting the backrest point 32 and the side panel interlocking point 31 is less than 70°, and may be preferably 48°, 50°, 55°, 60°, 65° or 68°. In this embodiment, when the backrest mechanism 4 is contracted to the limit position, the included angle α between the line connecting both end points of the backrest mounting member 41 and the line connecting the backrest point 32 and the side panel interlocking point 31 is 65°. When the backrest mechanism 4 is extended to the limit position, the included angle β between the line connecting both end points of the backrest mounting member 41 and the line connecting the backrest point 32 and the side panel interlocking point 31 is less than 45°, and may be preferably 30°, 35°, 40° or 43°. Specifically, in this embodiment, when the backrest mechanism 4 is extended to the limit position, the included angle β between the line connecting both end points of the backrest mounting member 41 and the line connecting the backrest point 32 and the side plate interlocking point 31 is 40°. When the backrest mounting member 41 rotates rearward and downward about the backrest point 32, the included angle α becomes smaller, and the backrest mounting member 41 moves forward simultaneously with the bracket side plate 3. Compared with the conventional structure, the backrest mechanism 4 of this embodiment has a small included angle α between the line connecting both end points of the backrest mounting member 41 and the line connecting the backrest point 32 and the side plate interlocking point 31 when in the seated posture position, so that the inclination angle of the seat backrest 5 after assembly is small, and the space occupied by the seat backrest 5 is reduced. In this embodiment, by optimizing and limiting the angle of the seat backrest, the seat backrest is more retracted when in a seated position, occupying less space at the rear, and the distance the backrest mechanism moves the seat backrest forward during extension is greater than or equal to the distance caused by the seat backrest rotating backward, i.e., the backrest tail edge 51 does not exceed the initial plane during the rotation of the seat backrest 5.

[0036] Specifically, the bracket side plate 3 of this embodiment includes a backrest connecting portion 34 and an L-shaped side plate body 33, and the side plate body 33 and the backrest connecting portion 34 are integrally molded or fixedly connected. The backrest connecting portion 34 is disposed at one end of the bracket side plate 3 that is connected to the backrest mechanism 4, and the backrest point 32 is disposed at the backrest connecting portion 34.

[0037] Specifically, the backrest mounting member 41 is an inverted T-shaped connecting member, and the backrest mounting member 41 is provided with a protruding frame mounting portion 411, which is used to mount the seat backrest 5 of the seat. When the seat bracket is extended to the limit position, the included angle γ between the frame mounting portion 411 and the horizontal plane is 35° or less. Preferably, in this embodiment, the included angle γ between the frame mounting portion 411 and the horizontal plane when extended to the limit position may be 30°, 32°, or 35°. When the backrest mounting member 41 rotates backward and extends, the included angle with the horizontal plane becomes smaller, that is, the backward rotation angle becomes larger, and the total extension length of the backrest mechanism 4 becomes longer. In this embodiment, the range of the maximum rotation angle of the backrest mounting portion 411 is 28° to 35°. Preferably, the maximum rotation angle of the backrest mounting portion may be 28°, 30°, 32°, or 35°. In this embodiment, by increasing the maximum rotation angle of the backrest mounting portion, the extension distance of the backrest can be increased and the height of the head in a sleeping position can be lowered. This realizes a weightless sleeping position in which the legs are higher than the head after extension, thereby increasing the comfort of the backrest.

[0038] In this embodiment, a seat frame mounting surface 36 is further provided on the outer side of the bracket side plate 3. The seat frame mounting surface 36 is used to mount the seat frame. The height of the seat frame mounting surface 36 is lower than the upper edge of the bracket side plate 3, and the distance H from the highest point of the seat frame mounting surface 36 to the bottom surface of the base 11 is 16 cm to 19 cm. It may be preferably 16 cm, 17 cm, 18 cm or 19 cm. In this embodiment, as shown in FIG. 4, a plurality of seat frame mounting surfaces 36 are provided on the outer side of the bracket side plate 3, and the seat frame mounting surface 36 and the bracket side plate 3 are integrally formed by bending, so that the overall height of the bracket side plate 3 and the linkage mechanism 2 is reduced, the length of the parts in the linkage mechanism 2 is shortened, the strength is improved, the mounting height of the seat frame is reduced, and the stability of the linkage mechanism 2 is improved, so that the height of the seat frame mounting surface in this embodiment can meet the design requirements of a sofa or seat with a low seat height and high functionality.

[0039] Specifically, the linkage mechanism 2 of this embodiment includes a first support member 21, a swinging member 22, an intermediate connecting member 23, an interlocking member 24, and a second support member 25. The first support member 21 and the second support member 25 are rotatably connected to both ends of the base 1. The swinging member 22 is connected to the first support member 21. The swinging member 22 and the interlocking member 24 are connected to both ends of the intermediate connecting member 23.

[0040] Specifically, the interlocking member 24 is provided with four connection points, and is rotatably connected to the intermediate connecting member 23, the bracket side plate 3, the second support member 25, and the backrest interlocking member 42, respectively. The interlocking member 24 is provided with an interlocking point 241 and a support connection point 242. The interlocking member 24 is connected to the intermediate connecting member 23 at the interlocking point 241, and is rotatably connected to the second support member 25 at the support connection point 242. A line connecting the interlocking point 241 and the support connection point 242 is defined as L1, and a line connecting the support connection point 242 and the connection point between the second support member 25 and the base 1 is defined as L2. When the linkage mechanism 2 is extended to the limit position, the included angle δ between L1 and L2 is 8° to 15°.

[0041] In addition, the position where the line L1 connecting the interlocking point 241 and the support connection point 242 and the line L2 connecting the support connection point 242 and the connection point of the second support member 25 and the base 1 are collinear is the dead center position of the rotation of the second support member 25, so in order to ensure that the second support member 25 can be smoothly rotated, it is necessary to make the included angle between L1 and L2 larger than 0°. Preferably, in this embodiment, the included angle δ between the line connecting the interlocking point 241 and the support connection point 242 and the second support member 25 may be 8°, 9°, 10°, 12°, or 15°. At this time, the second support member can be smoothly rotated, and the distance that the interlocking member extends the second support member can be increased. Preferably, a position control member may be further provided between the second support member 25 and the base 1. The position control member is used to limit the maximum forward rotation angle of the second support member so that the second support member can be smoothly rotated.

[0042] Specifically, when the linkage support structure 2 is extended forward to its limit position, the included angle ε between the second support member 25 and the horizontal plane is less than 42°, and preferably, the included angle ε is 38°, 40° or 42°. In this embodiment, the forward rotation angle of the second support member 25 is increased, and the included angle between the second support member 25 and the base after rotation is reduced, and the overall extension distance of the seat bracket is further extended, so that under the same extension length condition, the dimensions of the components of the linkage mechanism of the present application can be reduced and the overall height can be further reduced.

[0043] Specifically, the ratio range of the distance A1 from the interlocking point 241 to the support connection point 242 to the distance A2 from the support connection point 241 to the connection point between the second support member 25 and the base 1 is 0.6 to 0.75. Preferably, it may be 0.6, 0.65, 0.67, 0.7 or 0.75. By optimizing the above-mentioned rotation angle of the second support member 25 and the ratio between the component length and the extended length of the second support member 25, within the ratio range of this embodiment, the overall height of the linkage mechanism is reduced, the support strength is improved, and the stability of the structure is improved.

[0044] Specifically, the interlocking member 24 is further provided with a side panel connection point 243 and a back connection point 244. The side panel connection point 243 is used to connect with the bracket side panel 3, that is, the side panel connection point 243 and the side panel interlocking point 31 are the same point. The back connection point 244 is used to connect with the backrest mechanism 4. During the extension and retraction of the linkage mechanism 2, the distance H3 from the back connection point 244 to the bottom surface of the base 1 is 3 cm or more, so that the interlocking member 24 does not contact or interfere with the ground during exercise.

[0045] Specifically, as shown in Fig. 3, the swinging member 22 of this embodiment is provided with a first connecting point 221, a second connecting point 222, and a third connecting point 223, and the swinging member 22 is rotatably connected to the first support member 21 at the first connecting point 221, rotatably connected to the intermediate connecting portion 23 at the second connecting point 222, and rotatably connected to the bracket side plate 3 at the third connecting point 223. The distance between the second connecting point 222 and the third connecting point 223 is B1, the distance between the second connecting point 222 and the first connecting point 221 is B2, and the ratio of B1 to B2 is in the range of 0.6 to 0.7. The included angle θ between the line connecting the second connecting point 222 and the third connecting point 223 and the line connecting the second connecting point 222 and the first connecting point 221 is an acute angle. Preferably, the included angle θ between the line connecting the second connection point 222 and the third connection point 223 and the line connecting the second connection point 222 and the first connection point 221 may be 70°, 72°, 76°, or 80°.

[0046] All the above optimizations of this embodiment further allow the seat to have a lower seat frame mounting height, and the seat bracket to move forward a longer distance during extension, leaving more space for the rear seat backrest.

[0047] 8 to 10, the seat unit of this embodiment further includes a seat backrest 5, which is connected to the backrest mounting member 41. The seat backrest 5 includes a backrest tail edge 51. When the seat bracket is contracted to its limit position, a plane perpendicular to the horizontal plane on which the backrest tail edge 51 is located is set as an initial plane, and when the backrest mechanism 4 moves together with the linkage mechanism 2 and the bracket side plate 3 between the contraction limit position and the extension limit position, the rearward movement of the backrest tail edge 51 does not exceed the initial plane.

[0048] Specifically, the seat backrest 5 further includes a backrest tail 52 and a main body 53. The main body 53 is connected to the backrest mechanism 4, the backrest tail edge 51 is located at the rear edge of the backrest tail 52, and the width of the backrest tail 52 is larger than that of the main body 53. In the process in which the backrest mechanism 4 rotates the seat backrest 5, the backrest tail 52 is rotatable around the seat armrest.

[0049] Specifically, as shown in FIG. 8, in this embodiment, the structure of the linkage mechanism 2 and the bracket side plate 3 is optimized to reduce the overall height and change the rotation angle of the backrest mechanism 4, so that when the seat backrest 5 is contracted to the limit position, the distance H1 from the backrest tail edge 51 to the bottom surface of the base 1 is 70 cm to 85 cm. Preferably, the distance H1 from the backrest tail edge 51 to the bottom surface of the base 1 may be 70 cm, 75 cm, 78 cm, 80 cm, or 85 cm. When the seat backrest 5 is extended to the limit position, the distance H2 from the backrest tail edge 51 to the bottom surface of the base 1 is 50 cm to 65 cm. Preferably, the distance H2 from the backrest tail edge 51 to the bottom surface of the base 1 may be 50 cm, 58 cm, 60 cm, or 65 cm. Compared with a conventional seat unit having a mechanical extension device, the seat unit in this embodiment reduces the overall height of the seat backrest and improves the aesthetics and flexibility of the backrest.

[0050] Specifically, the seat unit of this embodiment is fixed to the inside of the seat armrest 9 through the bracket side plate. In one embodiment, as shown in FIG. 9, when the seat armrest 9 is fixed to the bracket side plate 3, the seat armrest 9 is a follow-up armrest that moves together with the bracket side plate 3. In the process of the backrest mechanism 4 moving the seat backrest 5, the backrest tail 52 rotates around the seat armrest 9. When the backrest mechanism 4 contracts to the limit position, the plane perpendicular to the horizontal plane on which the backrest tail edge 51 is located is the initial plane. In the process of the backrest mechanism 4 moving the seat backrest 5, the movement of the backrest tail edge 51 does not exceed the initial plane. The seat of this embodiment can be designed as a seat style having a T-shaped seat backrest with a wide tail and a follow-up seat armrest.

[0051] In another embodiment, as shown in FIG. 10, when the seat armrest 9 is fixed to the base 1, the seat backrest 5 includes a backrest body 54, and the width of the backrest body 54 is smaller than the distance between the two seat armrests 9. Note that the seat armrest 9 is fixed to a horizontal plane, i.e., the seat armrest is floor-mounted, which is also called an armrest floor-mounted seat. When the backrest mechanism 4 is contracted to the limit position, the plane perpendicular to the horizontal plane on which the backrest tail edge 51 is located is set as the initial plane, and in the process of the backrest mechanism 4 moving the seat backrest 5 forward, the rearward movement of the backrest tail edge 51 does not exceed the initial plane, i.e., during the rearward rotation extension of the seat backrest 5, the tail edge of the seat moves forward and away from the vertical plane, or moves downward along the vertical plane. When set as an armrest floor-mounted seat, the seat armrest is fixed and does not move during position adjustment, and the seat backrest 5 moves parallel between the armrests on both sides and rotates to adjust.

[0052] The seat bracket of this embodiment further includes a leg mechanism 6. The leg mechanism 6 is rotatably connected to the front of the bracket side plate 3, and the leg mechanism 6 expands and contracts in front of the bracket side plate. The leg mechanism has an extendable multi-connecting rod structure.

[0053] The seat bracket of this embodiment has two sets of identical bracket structures arranged opposite each other. The seat bracket further includes a first base 11 and a second base 12 arranged at both ends of a base 1 and connecting the two opposing bases 1. The two opposing bases 1 and the first bases 11 and second bases 12 connecting them form a bottom frame structure.

[0054] Specifically, as shown in Figs. 6 and 7, the transmission mechanism 7 further includes a transmission mechanism 7 and a drive mechanism 8. The transmission mechanism 7 includes an interlocking bracket 71 and a transmission shaft 72. Both ends of the transmission shaft 72 are respectively transmission-connected to the leg mechanisms 6 on both sides, one end of the interlocking bracket 71 is connected to the center of the transmission shaft 72, and the other end of the interlocking bracket 71 is hinged to a slide block 83 of the drive mechanism 8. Specifically, in some embodiments, a through hole is provided in the bracket side plate 3, and an end of the transmission shaft 72 is connected to the transmission connecting rod 61 of the leg mechanism 6 arranged on the outside of the bracket side plate 3 through the through hole, and the other connecting rod structure of the leg mechanism 6 expands and contracts through the first transmission member 61. In some other embodiments, a groove or gap through which the transmission shaft 72 passes is provided below the bracket side plate 3. An end of the transmission shaft 72 is connected to the transmission connecting rod 61 of the leg mechanism 6 arranged on the outside of the bracket side plate 3 through the groove or gap. In addition, the length of the transmission shaft 72 in this embodiment is longer than the distance between the two bracket side plates 3, to avoid interference between moving parts caused by the small space inside the bracket side plates 3. Specifically, the transmission shaft 62 may be a transmission square tube.

[0055] Specifically, the drive mechanism 8 includes a drive motor 81, a slide rail 82, and a slide block 83. The slide rail 82 is arranged parallel to a horizontal plane, and the slide block 83 is connected to the transmission shaft 72 via an interlocking bracket 71. Specifically, one end of the slide rail 82 is fixed to the first base 11, and the other end of the slide rail 82 is connected to the drive motor 81, which is fixed to the second base 12. When the leg mechanism 6 and the backrest mechanism 4 are driven from the contracted position to the fully extended limit position, the slide stroke of the slide block 83 is 26 cm to 33 cm. Preferably, the slide stroke of the slide block 83 may be 26 cm, 27 cm, 28 cm, 30 cm, or 33 cm. In this embodiment, when the transmission shaft 72 reaches the fully extended limit position from the fully contracted limit position by the slide block 83, the forward movement distance of the transmission shaft 72 is 20 cm or more. Preferably, it may be 20 cm, 22 cm, or 25 cm. For example, in some embodiments, if the maximum sliding stroke of the slide block 83 is 28 cm, the distance that the transmission shaft 72 is moved forward is greater than 20 cm.

[0056] In this embodiment, the driving mechanism 8 and the transmission mechanism 7 cooperate with each other, so that when the height of the transmission shaft 72 is lower, the slide stroke of the slide block 83 driving the transmission shaft 72 is longer, the extension distance of the seat backrest mechanism and the leg mechanism is longer, and the pushing accuracy and pushing efficiency are higher. In addition, the conventional push rod motor needs to be installed at an angle to the base, and the stroke of the push rod is relatively long. In the existing seat driving mechanism, one end of the slide rail is a free end, and when the slider slides on the slide rail, the slide rail swings relative to the base, so the center of gravity of the drive changes, and the driving process is prone to shaking and clogging, making the driving unstable. Compared with the conventional driving mechanism, in the driving mechanism 8 of this embodiment, the slide rail 82 is arranged parallel to the horizontal plane, and both ends of the slide rail 82 are fixed. When driven by the driving motor 81, the slide block 83 slides linearly on the slide rail 82. The height of the transmission shaft 72 is relatively low, and the transmission center of gravity and the center of gravity of the driving mechanism 8 are close to the base, making the driving process more stable and smooth, and improving the pushing accuracy.

[0057] In this embodiment, the drive mechanism 8 drives and moves the transmission mechanism 7, thereby extending the leg mechanism 6 forward and moving and adjusting the linkage mechanism 2, the bracket side plate 3 and the backrest mechanism 4, so that the seat unit can be moved between the seated position, the extended position and the lying position.

[0058] In the present invention, by restricting the angle relationship between the backrest connection part and the backrest mounting member, under the condition that the extension length of the seat is ensured, the distance by which the linkage mechanism and the bracket side plate move the backrest mechanism forward and upward in parallel during the process of extending the seat unit is increased, and the distance caused by the backrest mechanism's backward rotation can be offset, so that the seat backrest of the seat unit can be arranged against a wall with zero clearance, further saving space. By combining and improving the linkage mechanism, backrest mechanism, etc., the present invention increases the extension distance of the seat unit, significantly lowers the seat height, and improves the stability of the structure and the comfort of the seat.

[0059] The seat backrest of the present invention may be a T-shaped frame structure with a wide backrest tail. Compared with the traditional floor-mounted armrest product, the T-shaped seat backrest allows the backrest tail to rotate around the seat armrests on both sides during the extension of the seat unit, and the seat armrests move together with the side plate linkage members, increasing the area of ​​the seat backrest. The seat backrest can also be used for seat styles with floor-mounted armrests. The design of the seat backrest and seat armrest is more flexible, can meet various styles of seat designs, and the appearance is more aesthetic.

[0060] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and are not intended to limit the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made without departing from the spirit and scope of the present invention shall be included in the protection scope of the present invention.

[0061] The reference symbols in the figure are as follows: 1-base, 2-linkage mechanism, 3-bracket side plate, 4-backrest mechanism, 31-side plate interlocking point, 32-backrest point, 41-backrest mounting part, 42-backrest interlocking member, 33-side plate main body, 34-backrest connection part, 411-frame mounting part, 5-seat backrest, 36-seat frame mounting surface, 51-backrest rear edge, 52-backrest tail, 53-main body, 54-backrest main body, 21-first support member, 22- oscillating member, 23-intermediate connecting member, 24-interlocking member, 25-second support member, 241-interlocking point, 242-support connection point, 243-side panel connection point, 244-back connection point, 221-first connection point, 222-second connection point, 223-third connection point, 6-leg mechanism, 7-transmission mechanism, 8-driving mechanism, 11-first base, 12-second base, 61-transmission connecting rod, 71-interlocking bracket, 72-transmission shaft, 8-driving mechanism, 81-driving motor, 82-slide rail, 83-slide block, 9-seat armrest.

Claims

1. A linkage device for realizing zero backrest clearance includes a base (1), a linkage mechanism (2), a bracket side plate (3), and a backrest mechanism (4), the linkage mechanism (2) is rotatably connected between the base (1) and the bracket side plate (3), the backrest mechanism (4) is rotatably connected to the bracket side plate (3) and the linkage mechanism (2), respectively, the bracket side plate (3) is provided with a side plate interlocking point (31) and a backrest point (32), the bracket side plate (3) is rotatably connected to the linkage mechanism (2) at the side plate interlocking point (31), and the bracket side plate (3) a backrest mechanism (4) including a backrest mounting member (41) and a backrest interlocking member (42), both ends of the backrest mounting member (41) being pivotally connected between the backrest point (32) and the backrest interlocking member (42), and when the backrest mechanism (4) is contracted to a limit position, an included angle α between a line connecting both end points of the backrest mounting member (41) and a line connecting the backrest point (32) and the side panel interlocking point (31) is an acute angle.

2. The linkage device for realizing zero backrest clearance as described in claim 1, characterized in that the bracket side plate (3) includes a backrest connection portion (34) and an L-shaped side plate body (33), and the side plate body (33) is integrally molded or fixedly connected to the backrest connection portion (34).

3. The linkage device for realizing zero backrest clearance as described in claim 2, characterized in that the backrest connection portion (34) is arranged at one end of the bracket side plate (3) connected to the backrest mechanism (4), and the backrest point (32) is arranged at the backrest connection portion (34).

4. A linkage device for realizing zero backrest clearance as described in claim 3, characterized in that when the backrest mechanism (4) is contracted to its limit position, the included angle α between a line connecting both end points of the backrest mounting member (41) and a line connecting the backrest point (32) and the side panel interlocking point (31) is less than 70°.

5. A linkage device for realizing zero backrest clearance as described in claim 3, characterized in that when the backrest mechanism (4) is extended to its limit position, the included angle β between a line connecting both end points of the backrest mounting member (41) and a line connecting the backrest point (32) and the side panel interlocking point (31) is less than 45°.

6. The linkage device for realizing zero backrest clearance as described in claim 3, characterized in that the backrest mounting member (41) is provided with a protruding frame mounting portion (411), the frame mounting portion (411) is used to mount a seat backrest (5) of a seat, and when the linkage device is extended to its limit position, the included angle γ between the frame mounting portion (411) and a horizontal plane is 35° or less.

7. A seat bracket comprising a base (1), a linkage mechanism (2), a bracket side plate (3), and a backrest mechanism (4), the linkage mechanism (2) being rotatably connected between the base (1) and the bracket side plate (3), the backrest mechanism (4) being rotatably connected to the bracket side plate (3) and the linkage mechanism (2), respectively, the linkage mechanism (2) comprising a first support member (21), a swing member (22), an intermediate connecting member (23), an interlocking member (24), and a second support member (25), the first support member (21) and the second support member (25) being rotatably connected to both ends of the base (1), respectively, and the swing member (22) being connected to the first support member (21). a line connecting the interlocking point (241) and the support connection point (242) is defined as L1, a line connecting the connection point between the second support member (25) and a base (1) and the support connection point (242) is defined as L2, and when the linkage mechanism (2) is extended to its limit position, an included angle δ between L1 and L2 is 8° to 15°.

8. 8. The seat bracket according to claim 7, wherein when the linkage mechanism (2) is extended forward to its limit position, an included angle ε between the second support member (25) and a horizontal plane is less than 42°.

9. The seat bracket according to claim 7, characterized in that a distance A1 is between the interlocking point (241) and the support connection point (242), a distance A2 is between the support connection point (242) and the connection point of the second support member (25) and the base (1), and a ratio range of A1 to A2 is 0.6 to 0.

75.

10. The seat bracket of claim 7, characterized in that the interlocking member (24) is further provided with a side plate connection point (243) and a back connection point (244), the side plate connection point (243) is used to connect with the bracket side plate (3), and the back connection point (244) is used to connect with the backrest mechanism (4), and during the extension and retraction of the linkage mechanism (2), a distance H3 from the back connection point (244) to the bottom surface of the base (1) is 3 cm or more.

11. The seat bracket according to claim 7, characterized in that the oscillating member (22) is provided with a first connection point (221), a second connection point (222) and a third connection point (223), the oscillating member (22) is rotatably connected to the first support member (21) at the first connection point (221) and is rotatably connected to the bracket side plate (3) at the third connection point (223), a distance from the second connection point (222) to the third connection point (223) is B1, a distance from the second connection point (222) to the first connection point (221) is B2, and a ratio range of B1 to B2 is 0.6 to 0.

7.

12. The seat bracket according to claim 11, characterized in that an included angle θ between a line connecting the second connection point (222) and the third connection point (223) and a line connecting the second connection point (222) and the first connection point (221) is an acute angle.

13. The seat bracket according to claim 7, further comprising a drive mechanism (6) and a leg mechanism (7), the leg mechanism (7) being rotatably connected to a front of the bracket side plate (3) and the linkage mechanism (2), and the drive mechanism (6) drives the leg mechanism (7) to extend and retract, thereby moving and adjusting the linkage mechanism (2), the bracket side plate (3) and the backrest mechanism (4) to enable the seat bracket to be moved between the positions of a sitting position, an extended position and a lying position.

14. The seat unit includes a base (1), a linkage mechanism (2), a bracket side plate (3), a backrest mechanism (4), and a seat backrest (5), the linkage mechanism (2) being rotatably connected between the base (1) and the bracket side plate (3), the backrest mechanism (4) being rotatably connected to the bracket side plate (3) and the linkage mechanism (2), respectively, a seat frame mounting surface (36) is provided on an outer surface of the bracket side plate (3), the height of the plane on which the seat frame mounting surface (36) is located is lower than the upper edge of the bracket side plate (3), and a distance H from the highest point of the seat frame mounting surface (36) to the bottom surface of the base (1) is 16 cm to 19 cm, and the backrest mechanism (4) is connected to a backrest mounting member (41) and a backrest interlocking member (42). the backrest attachment member (41) is rotatably connected to the bracket side plate (3), both ends of the backrest interlocking member (42) are rotatably connected to the backrest attachment member (41) and a linkage mechanism (2), the backrest attachment member (41) is connected to the seat backrest (5), the seat backrest (5) includes a backrest tail edge (51), when a seat bracket is contracted to a limit position, a plane perpendicular to a horizontal plane on which the backrest tail edge (51) is located is set as an initial plane, and when the backrest mechanism (4) moves together with the linkage mechanism (2) and the bracket side plate (3) between a contraction limit position and an extension limit position, the rearward movement of the backrest tail edge (51) does not exceed the initial plane.

15. 15. The seat unit according to claim 14, characterized in that the seat backrest (5) further comprises a backrest tail (52) and a main body (53), the backrest tail edge (51) is located at the rear edge of the backrest tail (52), the backrest tail (52) has a width greater than that of the main body (53), and the backrest tail (52) is rotatable around the seat armrest during the process of the backrest mechanism (4) rotating the seat backrest (5).

16. The seat unit according to claim 14, characterized in that, when the seat backrest (5) is contracted to its limit position, a distance H1 from the backrest tail edge (51) to the bottom surface of the base (1) is 70 cm to 85 cm.

17. The seat unit according to claim 16, characterized in that, when the seat backrest (5) is extended to its limit position, a distance H2 from the backrest tail edge (51) to the bottom surface of the base (1) is 50 cm to 65 cm.

18. A seat comprising a seat armrest (9) and a seat unit according to any one of claims 14 to 17, the seat unit being fixed to an inner side of the seat armrest (9) via a bracket side plate (3).

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