Seat backrest overturning adjusting structure

Abstract

The utility model discloses a seat backrest turnover adjusting structure, which belongs to the technical field of seat structures and comprises a backrest support, a backrest swing arm, a telescopic rod and an adjusting switch, the backrest support is arranged on the back of a seat, and the top of the backrest swing arm is rotatably connected with the top of the backrest support. An included angle is formed between the backrest swing arm and the backrest support, the backrest support is located on the back of the backrest swing arm, and the front face of the backrest swing arm is used for being connected with a seat backrest cushion. The telescopic rod is installed in the backrest support, the two ends of the telescopic rod are connected with the backrest support and the backrest swing arm respectively, and the telescopic rod is provided with a control switch used for controlling the telescopic rod to stretch out and draw back in the length direction. In the adjusting process of the seat backrest, due to the fact that the length of the telescopic rod is adjusted to any position to be locked, stepless adjustment of the seat backrest can be achieved, the backrest can be adjusted according to the requirements of a user, more use angle requirements are met, and universality is higher.

Description

Technical Field

[0001] The utility model belongs to the technical field of seat structures, and in particular relates to a seat backrest flip 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. The second adjustment component includes a backrest inclination adjustment structure that adjusts the backrest inclination by flipping adjustment. The backrest inclination adjustment structure includes at least a third adjustment gear that adjusts the backrest to a vertical state with the seat and a fourth adjustment gear that adjusts the backrest to a parallel state with the seat. The backrest inclination adjustment structure also includes a number of backrest intermediate gears that adjust the backrest to different inclination states between the vertical and parallel states with the seat. Although the backrest of the seat can be adjusted inclination, the backrest is flipped around the second adjustment component on the back, and the adjustment angle needs to be adjusted according to the set gear. The adjustment angle has certain limitations and cannot achieve the effect of arbitrary angle adjustment, which has a certain impact on the inclination adjustment of the seat back. Utility Model Content

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

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

[0005] A seat back flip adjustment structure comprises a backrest bracket, a backrest swing arm, a telescopic rod and an adjustment switch, wherein the backrest bracket is arranged on the back of the seat, the top of the backrest swing arm is rotatably connected to the top of the backrest bracket, the backrest swing arm and the backrest bracket are arranged at an angle, the backrest bracket is located at the back of the backrest swing arm, and the front of the backrest swing arm is used to connect the seat back cushion; the telescopic rod is installed in the backrest bracket, the two ends of the telescopic rod are respectively connected to the backrest bracket and the backrest swing arm, the telescopic rod is provided with a control switch for controlling the extension and retraction of the telescopic rod length, the adjustment switch is arranged on the backrest bracket or the backrest swing arm, and the adjustment switch is connected to the control switch through a pull wire; the backrest swing arm rotates with the backrest bracket based on a first rotation axis, and the backrest swing arm rotates with the telescopic rod based on a second rotation axis, and the first rotation axis and the second rotation axis are parallel lines that do not overlap with each other.

[0006] In the utility model, the rear side of the top of the backrest swing arm has a connecting cavity for the top of the backrest bracket to be inserted and matched for connection, and a mounting seat for connecting to the end of the telescopic rod is provided in the connecting cavity, and the mounting seat is transversely arranged in the connecting cavity. An insertion portion for inserting into the connecting cavity for matching connection is provided on the top of the backrest bracket, and a guide groove with a top opening is provided on the insertion portion. The guide groove is used for sliding guidance in cooperation with the mounting seat when the backrest swing arm is flipped and adjusted.

[0007] In the utility model, an upper limit plate is provided at the bottom of the guide groove, and the upper limit plate cooperates with the mounting seat to limit the highest point of the upward flip adjustment of the backrest swing arm.

[0008] In the utility model, a limiting groove is provided on the top of the insertion part, and a limiting block for cooperating with the limiting groove is provided in the connecting cavity. The limiting groove and the limiting block cooperate to limit the highest point of the upward flipping adjustment of the backrest swing arm.

[0009] In the utility model, a lower limit plate is provided at the bottom of the connecting cavity, and the lower limit plate cooperates with the backrest bracket to limit the lowest point of the backrest swing arm for downward flipping adjustment.

[0010] In the utility model, the adjustment switch includes an adjustment handle, a return spring and a guide slide; the adjustment handle is movably arranged on the backrest swing arm; the two ends of the return spring are respectively connected to the adjustment handle and the backrest swing arm; the guide slide is fixedly connected to the adjustment handle; the adjustment handle moves up and down through the guiding action of the guide slide on the backrest swing arm; and the pull wire is connected to the adjustment handle.

[0011] In the utility model, a slide groove for cooperating with a guide slide bar is provided on the backrest swing arm, one end of the guide slide bar is slidably matched with the slide groove, and the other end of the guide slide bar is fixedly connected to the adjustment handle.

[0012] In the utility model, a protective wire sleeve is sleeved on the outer side of the pull wire, and two ends of the pull wire extend out from two ends of the protective wire sleeve respectively, and the two ends of the protective wire sleeve are respectively fixedly connected to the backrest swing arm and the backrest bracket.

[0013] In the utility model, the adjustment handle is provided with a handle hole for the user to hold, and the upper and lower sides of the handle hole are provided with limit convex plates for limiting the up and down sliding movement. When the adjustment handle slides up and down relative to the backrest swing arm, the limit slid up and down is performed based on the cooperation between the limit convex plate and the backrest swing arm.

[0014] In the utility model, the handle hole and the limiting convex plate are formed by integral stamping.

[0015] The beneficial effects of the utility model are as follows: when the seat back needs to be flipped and adjusted, the pull wire can be pulled by the adjustment switch, and the pull wire pulls the control switch of the telescopic rod. When the control switch of the telescopic rod is in the on state, the telescopic rod can be telescoped and adjusted in length. At this time, the backrest swing arm can be adjusted to change the angle between the backrest swing arm and the backrest bracket, thereby realizing the adjustment of the flipping angle of the seat back; when the backrest swing arm is adjusted to the required angle, the pull wire can be driven by resetting the adjustment switch, and the pull wire drives the control switch of the telescopic rod to reset. At this time, the control switch of the telescopic rod is in the off state, and the length of the telescopic rod is in the locked state. Therefore, the backrest swing arm is in the locked state because the length of the telescopic rod cannot be extended or retracted, so that the seat back is locked in this position; during the adjustment process of the seat back, since the length of the telescopic rod is adjusted to any position and locked, the seat back can be infinitely adjusted, so that the backrest can be adjusted according to the needs of the user, meeting more usage angle requirements and having higher versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Schematic diagram of the overall structure of the chair frame of this embodiment;

[0017] Figure 2 This is a schematic diagram of the internal structure of the seat back flip adjustment structure of this embodiment;

[0018] Figure 3 This is a schematic diagram of the structure of the backrest swing arm of this embodiment;

[0019] Figure 4 This is a schematic diagram of the structure of the backrest bracket of this embodiment;

[0020] Figure 5 It is a schematic diagram of the overall structure of the seat back flip adjustment structure of this embodiment;

[0021] Figure 6 This is a schematic diagram of the structure of the adjustable handle of this embodiment. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] 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.

[0025] like Figures 1 to 6 As shown, this embodiment discloses a seat back flip adjustment structure, including a backrest bracket 1, a backrest swing arm 2, a telescopic rod 3 and an adjustment switch 4, the backrest bracket 1 is arranged on the back of the seat, the top of the backrest swing arm 2 is rotatably connected to the top of the backrest bracket 1, the backrest swing arm 2 and the backrest bracket 1 are arranged at an angle, the backrest bracket 1 is located at the back of the backrest swing arm 2, and the front of the backrest swing arm 2 is used to connect the seat back cushion; the telescopic rod 3 is installed in the backrest bracket 1, the two ends of the telescopic rod 3 are respectively connected to the backrest bracket 1 and the backrest swing arm 2, the telescopic rod 3 is provided with a control switch 31 for controlling the length extension of the telescopic rod 3, the adjustment switch 4 is arranged on the backrest bracket 1 or the backrest swing arm 2, and the adjustment switch 4 is connected to the control switch 31 through a pull wire 7; the backrest swing arm 2 and the backrest bracket 1 rotate based on a first rotation axis 5, and the backrest swing arm 2 and the telescopic rod 3 rotate based on a second rotation axis 6, and the first rotation axis 5 and the second rotation axis 6 are parallel lines that do not overlap with each other. When the seat back needs to be flipped and adjusted, the pull wire 7 can be pulled by the adjustment switch 4, and the pull wire 7 pulls the control switch 31 of the telescopic rod 3. When the control switch 31 of the telescopic rod 3 is in the open state, the telescopic rod 3 can be telescopically adjusted in length. At this time, the backrest swing arm 2 can be adjusted to change the angle between the backrest swing arm 2 and the backrest bracket 1, thereby realizing the adjustment of the flip angle of the seat back; when the backrest swing arm 2 is adjusted to the required angle, the pull wire 7 can be driven by the adjustment switch 4 to reset, and the pull wire 7 drives the control switch 31 of the telescopic rod 3 to reset. At this time, the control switch 31 of the telescopic rod 3 is in the closed state, and the length of the telescopic rod 3 is in the locked state. Therefore, the backrest swing arm 2 is in the locked state because the length of the telescopic rod 3 cannot be extended or retracted, so that the seat back is locked in this position; during the adjustment process of the seat back, since the length of the telescopic rod 3 is adjusted to any position and locked, the seat back can be infinitely adjusted, so that the backrest can be adjusted according to the needs of the user, meeting more usage angle requirements, and having higher versatility.

[0026] In this embodiment, the rear side of the top of the backrest swing arm 2 has a connection cavity 21 for the top of the backrest bracket 1 to be inserted and connected, and a mounting seat 22 for connecting with the end of the telescopic rod 3 is provided in the connection cavity 21. The mounting seat 22 is arranged transversely in the connection cavity 21. The top of the backrest bracket 1 is provided with an insertion portion 11 inserted into the connection cavity 21 for connection, and a guide groove 12 with a top opening is provided on the insertion portion 11. The guide groove 12 is used for sliding guidance with the mounting seat 22 when the backrest swing arm 2 is turned over and adjusted. When the backrest swing arm 2 is turned over and adjusted, the backrest swing arm 2 rotates relative to the backrest bracket 1 around the first rotation axis 5. At this time, the height position of the mounting seat 22 relative to the backrest bracket 1 will change, and the length of the telescopic rod 3 needs to be changed accordingly, and the mounting seat 22 slides along the guide groove 12. Furthermore, in order to limit the tilting adjustment angle of the backrest swing arm 2 and avoid the problem that the telescopic rod 3 fails to be telescopically adjusted due to excessive adjustment of the backrest swing arm 2, an upper limit plate 13 is provided at the bottom of the guide groove 12, and the upper limit plate 13 cooperates with the mounting seat 22 to limit the highest point of the upward tilting adjustment of the backrest swing arm 2; or, a limit groove 14 is provided at the top of the insertion portion 11, and a limit block 23 for cooperating with the limit groove 14 is provided in the connecting cavity 21, and the limit groove 14 cooperates with the limit block 23 to limit the highest point of the upward tilting adjustment of the backrest swing arm 2. A lower limit plate 24 is provided at the bottom of the connecting cavity 21, and the lower limit plate 24 cooperates with the backrest bracket 1 to limit the lowest point of the downward tilting adjustment of the backrest swing arm 2.

[0027] In this embodiment, the adjustment switch 4 includes an adjustment handle 41, a return spring 42 and a guide slide 43. The adjustment handle 41 is movably arranged on the backrest swing arm 2. The two ends of the return spring 42 are respectively connected to the adjustment handle 41 and the backrest swing arm 2. The guide slide 43 is fixedly connected to the adjustment handle 41. The adjustment handle 41 moves up and down through the guiding effect of the guide slide 43 on the backrest swing arm 2. The pull wire 7 is connected to the adjustment handle 41. When the user pulls the adjustment handle 41 downward, the adjustment handle 41 drives the pull wire 7 to pull the control switch 31 to operate, so that the telescopic rod 3 can be adjusted in length. At the same time, in the process of the adjustment handle 41 sliding downward, under the guiding effect of the guide slide 43, the adjustment handle 41 slides more smoothly, which can avoid the problem of the adjustment handle 41 being stuck. The adjustment handle 41 pulls the return spring 42 to extend, and the return spring 42 has elastic force. When the user releases the adjustment handle 41, the adjustment handle 41 slides upward and resets under the elastic force of the reset spring 42, and the adjustment handle 41 drives the pull wire 7 to reset. At this time, the pull wire 7 has no pulling force on the control switch 31, the control switch 31 is reset, and the telescopic rod 3 is in a locked state. Further, the backrest swing arm 2 is provided with a slide groove 25 for cooperating with the guide slide bar 43, one end of the guide slide bar 43 is slidably matched with the slide groove 25, and the other end of the guide slide bar 43 is fixedly connected to the adjustment handle 41. The outer side of the pull wire 7 is provided with a protective wire sleeve 8, and the two ends of the pull wire 7 extend from the two ends of the protective wire sleeve 8 respectively, and the two ends of the protective wire sleeve 8 are respectively fixedly connected to the backrest swing arm 2 and the backrest bracket 1. By providing the protective wire sleeve 8, the pull wire 7 can be isolated from the internal structure of the backrest swing arm 2 and the backrest bracket 1, ensuring that when the adjustment switch 4 is actuated, the pull wire 7 can be pulled to act, thereby avoiding the problem of adjustment failure. Furthermore, by providing a protective wire sleeve 8 on the outside of the pull wire 7, a certain protection effect can be provided to the pull wire 7, reducing the wear of the pull wire 7 and extending its service life. The adjustment handle 41 is provided with a handle hole 411 for the user to hold, and both upper and lower sides of the handle hole 411 are provided with a limit convex plate 412 for upper and lower sliding limit. When the adjustment handle 41 slides up and down relative to the backrest swing arm 2, the limit convex plate 412 cooperates with the backrest swing arm 2 to perform upper and lower sliding limit. Preferably, the handle hole 411 and the limit convex plate 412 are integrally stamped.

[0028] 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 flip adjustment structure, characterized in that: The invention comprises a backrest bracket (1), a backrest swing arm (2), a telescopic rod (3) and an adjustment switch (4), wherein the backrest bracket (1) is arranged on the back of the seat, the top of the backrest swing arm (2) is rotatably connected to the top of the backrest bracket (1), the backrest swing arm (2) and the backrest bracket (1) are arranged at an angle, the backrest bracket (1) is located on the back of the backrest swing arm (2), and the front of the backrest swing arm (2) is used to connect to the seat back cushion; the telescopic rod (3) is installed in the backrest bracket (1), and the two ends of the telescopic rod (3) are respectively connected to the backrest bracket (1) and the backrest. The invention relates to a swing arm (2), wherein the telescopic rod (3) is provided with a control switch (31) for controlling the length of the telescopic rod (3), the regulating switch (4) is arranged on the backrest bracket (1) or the backrest swing arm (2), and the regulating switch (4) is connected to the control switch (31) via a pull wire (7); the backrest swing arm (2) and the backrest bracket (1) rotate based on a first rotation axis (5), and the backrest swing arm (2) and the telescopic rod (3) rotate based on a second rotation axis (6), and the first rotation axis (5) and the second rotation axis (6) are parallel lines that do not overlap with each other.

2. The seat back flip adjustment structure according to claim 1, characterized in that: The rear side of the top of the backrest swing arm (2) has a connecting cavity (21) into which the top of the backrest bracket (1) can be inserted for matching connection; a mounting seat (22) for connecting to the end of the telescopic rod (3) is provided in the connecting cavity (21); the mounting seat (22) is arranged transversely in the connecting cavity (21); an insertion portion (11) for inserting into the connecting cavity (21) for matching connection is provided at the top of the backrest bracket (1); a guide groove (12) with a top opening is provided on the insertion portion (11); the guide groove (12) is used for sliding guidance in cooperation with the mounting seat (22) when the backrest swing arm (2) is flipped and adjusted.

3. The seat back flip adjustment structure according to claim 2, characterized in that: An upper limit plate (13) is provided at the bottom of the guide groove (12), and the upper limit plate (13) cooperates with the mounting seat (22) to limit the highest point of the upward flip adjustment of the backrest swing arm (2).

4. The seat back flip adjustment structure according to claim 2, characterized in that: A limiting groove (14) is provided at the top of the insertion portion (11), and a limiting block (23) for cooperating with the limiting groove (14) for limiting is provided in the connection cavity (21). The limiting groove (14) and the limiting block (23) cooperate to limit the highest point of the upward flip adjustment of the backrest swing arm (2).

5. The seat back flip adjustment structure according to claim 2, characterized in that: A lower limit plate (24) is provided at the bottom of the connecting cavity (21), and the lower limit plate (24) cooperates with the backrest bracket (1) to limit the lowest point of the backrest swing arm (2) for downward flipping adjustment.

6. The seat back flip adjustment structure according to claim 1, characterized in that: The regulating switch (4) comprises an regulating handle (41), a return spring (42) and a guide slide bar (43); the regulating handle (41) is movably arranged on the backrest swing arm (2); two ends of the return spring (42) are respectively connected to the regulating handle (41) and the backrest swing arm (2); the guide slide bar (43) is fixedly connected to the regulating handle (41); the regulating handle (41) moves up and down through the guiding action of the guide slide bar (43) on the backrest swing arm (2); and the pull wire (7) is connected to the regulating handle (41).

7. The seat back flip adjustment structure according to claim 6, characterized in that: The backrest swing arm (2) is provided with a slide groove (25) for cooperating with the guide slide bar (43); one end of the guide slide bar (43) is slidably engaged with the slide groove (25); and the other end of the guide slide bar (43) is fixedly connected to the adjustment handle (41).

8. The seat back flip adjustment structure according to claim 7, characterized in that: A protective wire sleeve (8) is sleeved on the outer side of the pull wire (7), two ends of the pull wire (7) extend out from two ends of the protective wire sleeve (8), and two ends of the protective wire sleeve (8) are respectively fixedly connected to the backrest swing arm (2) and the backrest bracket (1).

9. The seat back flip adjustment structure according to claim 6, characterized in that: The adjusting handle (41) is provided with a handle hole (411) for a user to hold, and upper and lower sides of the handle hole (411) are provided with limit convex plates (412) for limiting upward and downward sliding movement. When the adjusting handle (41) slides upward and downward relative to the backrest swing arm (2), the limit convex plates (412) cooperate with the backrest swing arm (2) to limit upward and downward sliding movement.

10. The seat back flip adjustment structure according to claim 9, characterized in that: The handle hole (411) and the limiting convex plate (412) are integrally formed by stamping.

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