Seat backrest inclination angle adjusting structure

Abstract

The utility model discloses a seat backrest inclination angle adjusting structure, and belongs to the technical field of seat structures. Comprising a bottom frame, a swing arm, a backrest body, an adjusting switch and a telescopic rod, the swing arm is of a bevel structure and comprises a transverse arm extending transversely and a vertical arm extending vertically, the bottom of the transverse arm is rotationally connected with the bottom frame, and the top of the vertical arm is connected with the backrest body; the front end of the telescopic rod is fixedly installed in the bottom frame, the rear end of the telescopic rod is connected with the top of the cross arm through a movable frame, and the movable frame is installed in the bottom frame in a sliding mode. The front end of the telescopic rod is provided with a contact switch used for controlling the telescopic motion of the telescopic rod, and the adjusting switch is connected with the contact switch. The backrest can be locked in the angle state after being adjusted to the required inclination angle, a specific gear does not need to be set for locking, the flexibility of backrest adjustment is higher, and different angle adjustment requirements can be met.

Description

Technical Field

[0001] The utility model belongs to the technical field of seat structures, and in particular relates to a seat back inclination angle adjustment structure. Background Art

[0002] In order to adapt to different usage requirements, a new type of multifunctional seat has appeared on the market. As shown in the Chinese patent document with patent application number 202120150116.9, the backrest and the seat are connected by a second adjustment component, and the second adjustment component is installed on the back of the backrest and the bottom of the seat. The second adjustment component includes a backrest inclination adjustment structure for adjusting the backrest inclination, and the backrest inclination adjustment structure includes at least a third adjustment gear for adjusting the backrest to a vertical state with the seat and a fourth adjustment gear for adjusting the backrest to a parallel state with the seat. Although the backrest of the seat can be adjusted inclination, the backrest is adjusted by rotating around the second adjustment component on its back. When a person sits on the seat, the back rests on the backrest, and the backrest extends upward from the seat cushion and tilts, which is inconsistent with the inclination adjustment of the backrest. As a result, this backrest inclination adjustment structure is not suitable for adjusting the comfort of the backrest. It is necessary to provide a seat back with an inclination adjustment structure that can be adjusted to a comfortable leaning state. Utility Model Content

[0003] In order to overcome the deficiencies of the prior art, the utility model provides a seat back inclination angle adjustment structure.

[0004] The technical solution adopted by the utility model to solve its technical problems is:

[0005] A seat back tilt adjustment structure comprises a base frame, a swing arm, a backrest body, an adjustment switch and a telescopic rod, wherein the swing arm is an angled structure, and comprises a transverse arm extending laterally and a vertical arm extending vertically, the bottom of the transverse arm is rotatably connected to the base frame, and the top of the vertical arm is connected to the backrest body; the front end of the telescopic rod is fixedly installed in the base frame, the rear end of the telescopic rod is connected to the top of the transverse arm via a movable frame, and the movable frame is slidably installed in the base frame; the front end of the telescopic rod is provided with a contact switch for controlling the telescopic action of the telescopic rod, and the adjustment switch is connected to the contact switch.

[0006] In the utility model, the regulating switch includes a switch handle and a pressing spring sheet, the pressing spring sheet is fixed in the base frame, the pressing spring sheet is connected to the front end of the telescopic rod, the contact switch extends into the pressing spring sheet, the switch handle is rotatably connected to the base frame, the switch handle is provided with a protrusion protruding outward from the rotation axis of the switch handle, and the protrusion is connected to the pressing spring sheet.

[0007] In the utility model, the pressing spring sheet includes a fixing plate, a spring sheet plate and a connecting plate, the fixing plate is fixed in the base frame, the spring sheet plate is located at the front side of the fixing plate, extends upward and is connected to the fixing plate at an acute angle, the connecting plate is located at the front side of the spring sheet plate, extends downward and is connected to the spring sheet plate at an acute angle, the protrusion is connected to the angle between the connecting plate and the spring sheet plate, the contact switch is located at the angle between the spring sheet plate and the fixing plate, and the front end of the telescopic rod is fixed to the fixing plate.

[0008] In the utility model, a limit hook connected to the fixed plate is provided on the spring plate, the limit hook is buckled and connected to the top of the fixed plate, and the maximum angle between the spring plate and the fixed plate is limited based on the limit hook connection.

[0009] In the utility model, the base frame is provided with an inner cavity for the movable frame to move forward and backward, the top of the inner cavity is provided with a limit block for limiting the movable frame from leaving the inner cavity, and limit blocks are provided on both sides of the top of the inner cavity.

[0010] In the utility model, a cover plate is provided on the top of the inner cavity, the cover plate covers the top of the inner cavity, a connecting hole is opened on the limit block, and the cover plate is fastened and connected through a connecting piece passing through the connecting holes on the cover plate and the limit block.

[0011] In the utility model, a mounting hole for mounting a seat lifting mechanism is provided at the bottom of the base frame, and the mounting hole is located below the raised portion.

[0012] In the utility model, the connecting end of the base frame and the swing arm has an inclination adjustment active cavity, and the inclination adjustment active cavity has at least an active range for adjusting the angle between the swing arm and the base frame between 90° and 135°. The front and rear sides of the inclination adjustment active cavity are provided with limit plates for limiting the adjustment range of the swing arm.

[0013] The beneficial effects of the present invention are as follows: when adjusting the inclination angle of the backrest, the backrest is rotated and adjusted around the rotating connection between the swing arm and the base frame. At this time, the adjustment angle of the backrest extends upward from the base frame, which is equivalent to the extension direction when the back of a person sitting on the seat cushion leans against the backrest. The backrest fits the back of the person more closely and provides better support comfort. In addition, the inclination angle of the backrest of the present invention is adjusted based on the change in the length of the telescopic rod, and the telescopic adjustment of the telescopic rod has the advantage of stepless adjustment. Therefore, the backrest can be adjusted to the required inclination angle and then locked in the angle state without setting a specific gear for locking. The flexibility of the backrest adjustment is higher and can meet different angle adjustment needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 Schematic diagram of the overall structure of this embodiment;

[0015] Figure 2Schematic diagram of the internal structure of this embodiment;

[0016] Figure 3 Schematic diagram of the structure of the swing arm of this embodiment;

[0017] Figure 4 This is a schematic diagram of the structure of the regulating switch in this embodiment;

[0018] Figure 5 This is a schematic diagram of the structure of the switch handle of this embodiment;

[0019] Figure 6 This is a schematic diagram of the structure of the pressing spring sheet in this embodiment;

[0020] Figure 7 Schematic diagram of the internal structure of the chassis of this embodiment. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solution and advantages of the embodiments of the present utility model clearer, the technical solution in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model.

[0022] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0023] In addition, if there are descriptions involving "first" or "second" etc. in the embodiments of the utility model, the descriptions of "first" or "second" etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0024] like Figures 1 to 7As shown, the present embodiment discloses a seat back tilt adjustment structure, comprising a base frame 1, a swing arm 2, a backrest body 3, an adjustment switch 4 and a telescopic rod 5, wherein the swing arm 2 is an angled structure, and comprises a transverse arm 21 extending laterally and a vertical arm 22 extending vertically, wherein the bottom of the transverse arm 21 is rotatably connected to the base frame 1, and the top of the vertical arm 22 is connected to the backrest body 3; the front end of the telescopic rod 5 is fixedly installed in the base frame 1, and the rear end of the telescopic rod 5 is connected to the top of the transverse arm 21 through a movable frame 6, and the movable frame 6 is slidably installed in the base frame 1; the front end of the telescopic rod 5 is provided with a contact switch 51 for controlling the telescopic action of the telescopic rod 5, and the adjustment switch 4 is connected to the contact switch 51. The seat back inclination adjustment structure of the present embodiment adjusts the backrest inclination by rotating the backrest around the rotating connection between the swing arm 2 and the base frame 1. At this time, the adjustment angle of the backrest extends upward from the base frame 1, which is equivalent to the extension direction when the back of a person sitting on the seat cushion leans against the backrest. At this time, the backrest fits the back of the person more closely and provides better support comfort. In addition, the backrest of the present embodiment adjusts the inclination angle based on the change in the length of the telescopic rod 5, and the telescopic adjustment of the telescopic rod 5 has the advantage of stepless adjustment. Therefore, the backrest can be adjusted to the desired inclination angle and locked in the angle state without setting a specific gear for locking. The backrest adjustment is more flexible and can meet different angle adjustment requirements.

[0025] In this embodiment, the adjustment switch 4 includes a switch handle 41 and a pressing spring sheet 42, the pressing spring sheet 42 is fixed in the base frame 1, the pressing spring sheet 42 is connected to the front end of the telescopic rod 5, the contact switch 51 extends into the pressing spring sheet 42, the switch handle 41 is rotatably connected to the base frame 1, the switch handle 41 is provided with a protrusion 411 protruding outward from the rotation axis of the switch handle 41, and the protrusion 411 is connected to the pressing spring sheet 42. When the switch handle 41 rotates to make the protrusion 411 press against the pressing spring sheet 42, the pressing spring sheet 42 squeezes the contact switch 51 of the telescopic rod 5, so that the telescopic rod 5 is in a telescopic state, and the backrest can be adjusted in inclination. When the user releases the switch handle 41, the switch handle 41 is reset under the elastic force of the pressing spring sheet 42, the pressing spring sheet 42 is opened, the pressing spring sheet 42 no longer presses the contact switch 51, and the contact switch 51 automatically extends, so that the telescopic rod 5 returns to the locked state. At this time, the backrest is locked in this inclination state. Specifically, the pressing spring plate 42 includes a fixing plate 421, a spring plate 422 and a connecting plate 423, the fixing plate 421 is fixed in the base frame 1, the spring plate 422 is located at the front side of the fixing plate 421, extends upward and is connected to the fixing plate 421 at an acute angle, the connecting plate 423 is located at the front side of the spring plate 422, extends downward and is connected to the spring plate 422 at an acute angle, the protrusion 411 is connected to the angle between the connecting plate 423 and the spring plate 422, the contact switch 51 is located at the angle between the spring plate 422 and the fixing plate 421, the front end of the telescopic rod 5 is fixed on the fixing plate 421, and when the telescopic rod 5 is telescopic, the front end of the telescopic rod 5 does not move, and the rear end of the telescopic rod 5 moves. When the switch handle 41 rotates, under the limiting effect of the connecting plate 423, the protruding portion 411 of the switch handle 41 remains connected to the pressing spring sheet 42, and the switch handle 41 makes the spring sheet 422 close to the fixed plate 421, so that the spring sheet 422 touches the contact switch 51; and when the user releases the switch handle 41, the spring sheet 422 opens away from the fixed plate 421 under the effect of elastic force, and the spring sheet 422 leaves the contact switch 51, the contact switch 51 resumes the pop-up state, and the switch handle 41 rotates in the opposite direction to reset. Further, in order to prevent the pressing spring sheet 42 from being damaged due to excessive opening, a limit hook 424 connected to the fixed plate 421 is provided on the spring sheet 422, and the limit hook 424 is snap-connected to the top of the fixed plate 421, and the maximum angle between the spring sheet 422 and the fixed plate 421 is limited based on the limit hook 424 connection.

[0026] In this embodiment, the base frame 1 is provided with an inner cavity 11 for the movable frame 6 to move forward and backward. The top of the inner cavity 11 is provided with a limit block 12 for limiting the movable frame 6 from leaving the inner cavity 11. The limit blocks 12 are arranged on the left and right sides of the top of the inner cavity 11. Under the blocking effect of the limit blocks 12, the movable frame 6 will not leave the inner cavity 11, and can only move forward and backward inside the inner cavity 11. When the telescopic rod 5 is extended, the movable frame 6 moves to the rear end, and the front end of the movable frame 6 pulls the swing arm 2 to rotate around the rotating connection between the swing arm 2 and the base frame 1, and the backrest is adjusted in the vertical tilt direction; when the backrest is adjusted in the horizontal tilt direction, the swing arm 2 pulls the movable frame 6 to move to the front end, and the movable frame 6 shortens the telescopic rod 5. Further, in order to ensure the smooth movement of the movable frame 6 and the normal function of the seat back tilt adjustment, a cover plate 13 is provided on the top of the inner cavity 11, and the cover plate 13 covers the top of the inner cavity 11 to prevent debris from entering the inner cavity 11 and affecting the movement of the movable frame 6. The limit block 12 is provided with a connecting hole 14 , and the cover plate 13 is fastened and connected to the connection hole 14 on the limit block 12 through a connecting piece passing through the cover plate 13 and the limit block 12 .

[0027] In this embodiment, a mounting hole 15 for mounting a seat lifting mechanism is provided at the bottom of the base frame 1, and the mounting hole 15 is located below the raised portion 411. When the seat lifting mechanism is connected to the mounting hole 15, the lifting and lowering control switch at the top of the seat lifting mechanism is located at the top of the mounting hole 15. When the switch handle 41 is rotated toward one side of the mounting hole 15, the raised portion 411 of the switch handle 41 can touch and press the lifting and lowering control switch of the seat lifting mechanism, thereby controlling the lifting of the seat. Therefore, the adjustment switch 4 can control the seat back inclination adjustment as well as the seat lifting and lowering adjustment, thereby simplifying the mechanism components of the seat function adjustment and making it more convenient for users to operate.

[0028] In this embodiment, the connecting end of the base frame 1 and the swing arm 2 has an inclination adjustment activity cavity 16, and the inclination adjustment activity cavity 16 has at least an activity range for adjusting the angle between the swing arm 2 and the base frame 1 between 90° and 135°, and the front and rear sides of the inclination adjustment activity cavity 16 are provided with limit plates 17 for limiting the adjustment range of the swing arm 2; when the swing arm 2 is adjusted to the angle between the backrest and the seat cushion is 90°, under the limiting action of the limit plate 17, the swing arm 2 is limited from continuing to adjust in the direction of reducing the angle between the backrest and the seat cushion; when the swing arm 2 is adjusted to the maximum angle between the backrest and the seat cushion, under the limiting action of the limit plate 17, the swing arm 2 is limited from continuing to adjust in the direction of increasing the angle between the backrest and the seat cushion, and the limit plate 17 provides support for the swing arm 2 to improve the supporting force of the backrest.

[0029] The above description is only a preferred embodiment of the present invention. Any technical solution that achieves the purpose of the present invention by substantially the same means shall fall within the protection scope of the present invention.

Claims

1. A seat back tilt adjustment structure, characterized in that: The invention comprises a base frame (1), a swing arm (2), a backrest body (3), an adjustment switch (4) and a telescopic rod (5), wherein the swing arm (2) is an angled structure, and comprises a horizontal arm (21) extending laterally and a vertical arm (22) extending vertically, wherein the bottom of the horizontal arm (21) is rotatably connected to the base frame (1), and the top of the vertical arm (22) is connected to the backrest body (3); the front end of the telescopic rod (5) is fixedly mounted in the base frame (1), the rear end of the telescopic rod (5) is connected to the top of the horizontal arm (21) via a movable frame (6), and the movable frame (6) is slidably mounted in the base frame (1); the front end of the telescopic rod (5) is provided with a contact switch (51) for controlling the telescopic action of the telescopic rod (5), and the adjustment switch (4) is connected to the contact switch (51).

2. The seat back tilt adjustment structure according to claim 1, characterized in that: The regulating switch (4) comprises a switch handle (41) and a pressing spring sheet (42); the pressing spring sheet (42) is fixed in the base frame (1); the pressing spring sheet (42) is connected to the front end of the telescopic rod (5); the contact switch (51) extends into the pressing spring sheet (42); the switch handle (41) is rotatably connected to the base frame (1); the switch handle (41) is provided with a protrusion (411) protruding outward from the rotation axis of the switch handle (41); and the protrusion (411) is connected to the pressing spring sheet (42).

3. The seat back tilt adjustment structure according to claim 2, characterized in that: The pressing spring (42) comprises a fixing plate (421), a spring plate (422) and a connecting plate (423); the fixing plate (421) is fixed in the base frame (1); the spring plate (422) is located at the front side of the fixing plate (421), extends upward and is connected to the fixing plate (421) at an acute angle; the connecting plate (423) is located at the front side of the spring plate (422), extends downward and is connected to the spring plate (422) at an acute angle; the protrusion (411) is connected to the angle between the connecting plate (423) and the spring plate (422); the contact switch (51) is located at the angle between the spring plate (422) and the fixing plate (421); and the front end of the telescopic rod (5) is fixed to the fixing plate (421).

4. The seat back tilt adjustment structure according to claim 3, characterized in that: The spring plate (422) is provided with a limiting hook (424) connected to the fixing plate (421); the limiting hook (424) is snap-connected to the top of the fixing plate (421); and the maximum angle between the spring plate (422) and the fixing plate (421) is limited based on the connection of the limiting hook (424).

5. The seat back tilt adjustment structure according to claim 1, characterized in that: The base frame (1) is provided with an inner cavity (11) for the movable frame (6) to move forward and backward, and a limit block (12) is provided at the top of the inner cavity (11) for limiting the movable frame (6) from leaving the inner cavity (11), and limit blocks (12) are provided on both left and right sides of the top of the inner cavity (11).

6. The seat back tilt adjustment structure according to claim 5, characterized in that: A cover plate (13) is provided on the top of the inner cavity (11), the cover plate (13) covers the top of the inner cavity (11), a connection hole (14) is provided on the limit block (12), and the cover plate (13) is fastened and connected to the connection hole (14) on the cover plate (13) and the limit block (12) through a connecting piece.

7. The seat back tilt adjustment structure according to claim 2, characterized in that: The bottom of the base frame (1) is provided with a mounting hole (15) for mounting a seat lifting mechanism, and the mounting hole (15) is located below the raised portion (411).

8. The seat back tilt adjustment structure according to claim 1, characterized in that: The connecting end of the base frame (1) and the swing arm (2) is provided with an inclination adjustment activity cavity (16), the inclination adjustment activity cavity (16) having at least an activity range for adjusting the included angle between the swing arm (2) and the base frame (1) to be between 90° and 135°, and the front and rear sides of the inclination adjustment activity cavity (16) are both provided with limit plates (17) for limiting the adjustment range of the swing arm (2).

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