A seat back linkage chair

Abstract

The utility model discloses a seat back linkage chair, including base, chair back, seat, and seat front and rear sliding connection is established on the base, and the left and right sides of base are equipped with the handrail, and the left and right sides of chair back are equipped with linkage part, through the hinging of linkage part and corresponding handrail, and setting track guide structure between linkage part and seat, allow linkage part to rotate to form the forward component force to seat, and the rotation process of linkage part is converted into the process that seat slides forward, realize seat back linkage, avoid the influence of the sitting posture of the person who sits when seat slip to lift upward simultaneously, have promoted the use experience of seat.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to a seat-back linkage chair. Background Technology

[0002] Most chairs on the market have backrests that can rotate forward and backward, allowing for tilting. However, when the back is against the backrest and rotates backward, the backrest's rotation center is not the same as the human waist's rotation center, causing the back to move relative to the backrest. This prevents the backrest from fully conforming to the back, resulting in a "back slippage" phenomenon. At the same time, the backrest can also create a rubbing sensation on the back.

[0003] To avoid the aforementioned problems, chairs with interconnected backrests and seats have appeared on the market. For example, the chair patent with publication number CN209391482 includes a base, a seat frame, a backrest frame, and armrests mounted on the base. A linkage mechanism is provided between the backrest frame and the seat frame. The linkage mechanism includes a backrest fixing component, a connecting rod, and front and rear seat fixing components spaced apart on the seat frame. The armrests, seat frame, backrest fixing component, and connecting rod form a four-bar linkage mechanism. When the backrest frame rotates backward, the seat frame can be moved forward through the four-bar linkage mechanism, avoiding back strain and rubbing. However, in addition to moving the seat forward, the four-bar linkage mechanism also lifts the seat upward a certain distance after deformation. For smaller sitters, this upward lifting of the seat can create an upward squeezing sensation on the legs and may even cause the feet to leave the ground, affecting their normal sitting posture and causing discomfort. Summary of the Invention

[0004] This utility model provides a seat-back linkage chair. By hinged the linkage part to the corresponding armrest and setting a trajectory guide structure between the linkage part and the seat, the linkage part is allowed to rotate while forming a forward component force on the seat. The rotation process of the linkage part is transformed into the forward sliding process of the seat, realizing seat-back linkage. At the same time, it avoids the seat from lifting up when sliding, affecting the sitting posture of the user, and improving the user experience of the chair.

[0005] The technical solution of this utility model is implemented as follows: A seat-back linkage chair includes a base, a backrest, and a seat. The seat is slidably connected to the base. Armrests are provided on the left and right sides of the base. Linkage parts are provided on the left and right sides of the backrest. The linkage parts are hinged to the corresponding armrests and form rotation fulcrums. A trajectory guide structure is provided between each linkage part and the seat. The trajectory guide structure includes a guide pin provided on one of the linkage parts and the seat, and a guide groove provided on the other of the linkage parts and the seat. The extension direction of the guide groove is not parallel to the sliding direction of the seat. The guide pin is slidably engaged in the guide groove. When the backrest is subjected to a backward leaning force, the linkage part rotates around the rotation fulcrum and pushes the seat forward through the trajectory guide structure, so that the linked seat slides forward along a predetermined posture.

[0006] Preferably, the base and seat are provided with a sliding guide structure, which can guide the seat to slide back and forth.

[0007] Preferably, the sliding guide structure includes a guide groove extending forward and backward on one of the base and the seat, and an insert portion on the other of the base and the seat, the insert portion being inserted into the guide groove so that the seat is slidably connected to the base forward and backward.

[0008] Preferably, the sliding guide structure is a guide rail assembly between the base and the seat. The guide rail assembly includes a fixed rail and a sliding seat that slides back and forth on the fixed rail. The fixed rail and the sliding seat are respectively connected to the base and the seat to guide the seat to slide back and forth.

[0009] Preferably, the seat is in a horizontal position that slides forward; so that when the linkage rotates, the seat can slide forward.

[0010] Preferably, the guide groove extends directly upwards from bottom to top; or, the guide groove extends obliquely forward and upward or backward and upward, so that when the linkage rotates, the guide groove can avoid the guide pin in the longitudinal direction and avoid jamming.

[0011] Preferably, the extension trajectory of the guide groove is straight or curved.

[0012] Preferably, the handrail includes a handrail bracket and a handrail support member disposed on the handrail bracket for supporting the arm. The handrail support member includes a support portion located at the top of the handrail bracket and a side connecting portion extending downward from one end of the inner side of the support portion. The linkage portion is hinged to the side connecting portion.

[0013] Preferably, the handrail includes a handrail bracket and a handrail support member disposed at the top of the handrail bracket for supporting the arm, with the linkage hinged to the handrail bracket.

[0014] Preferably, the linkage is L-shaped, and includes a horizontal part and a vertical part. The rotation fulcrum is located at the junction of the horizontal part and the vertical part. The horizontal part is connected to the backrest. The seat includes a seat support part that is slidably connected to the base and a side bracket disposed on both sides of the seat support part and located below the rotation fulcrum. The trajectory guide structure is disposed between the vertical part and the corresponding side bracket.

[0015] Preferably, the handrail is provided with two limiting parts located on the front and rear sides of the linkage, respectively, and the rotation range of the linkage is limited between the two limiting parts; in order to avoid safety problems caused by excessive rotation range of the linkage.

[0016] A seat-back linkage chair includes a base, a backrest, and a seat. The seat is slidably connected to the base. Armrests are provided on the left and right sides of the base. Linkage parts are provided on the left and right sides of the backrest. The linkage parts are hinged to the corresponding armrests and form rotation fulcrums. A trajectory guide structure is provided between each linkage part and the seat. The trajectory guide structure includes a connecting rod disposed between the linkage part and the seat. The two ends of the connecting rod are respectively hinged to the linkage part and the seat. When the backrest rotates backward, the linkage part rotates around the rotation fulcrum and pushes the seat forward through the trajectory guide structure, thereby linking the seat to slide forward.

[0017] The beneficial effects of this utility model, which adopts the above technical solution, are as follows: This invention hinges the linkage part to the corresponding armrest and sets a guide pin and a guide groove between the linkage part and the seat. The sliding direction of the guide groove is not parallel to the sliding direction of the seat. Thus, when the back of the chair leans back and drives the linkage part to rotate, the guide groove can avoid the guide pin in the vertical direction, preventing the linkage part from generating an upward lifting force on the seat when rotating. At the same time, the guide pin squeezes the side wall of the guide groove while sliding, so as to generate a forward component force on the seat. This transforms the rotation process of the linkage part into the forward sliding process of the seat, realizing seat-back linkage. This avoids the upward lifting force generated on the sitter when the seat slides forward, which would affect the sitter's sitting posture and improve the user experience of the chair.

[0018] In another type of seat-back linkage chair of this utility model, a connecting rod is provided between the linkage part and the seat. The two ends of the connecting rod are respectively hinged to the seat and the linkage part. So when the back of the chair is tilted back and the linkage part is rotated, the connecting rod can dissipate the lifting force on the seat caused by the rotation of the linkage part through its own rotation. At the same time, the rotating connecting rod forms a forward component force on the seat, thereby transforming the rotation process of the linkage part into the process of the seat sliding forward. This realizes seat-back linkage and avoids the upward lifting force on the sitter when the seat slides forward, which would affect the sitter's sitting posture and improve the user experience of the chair. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the exterior of a chair with a linked seat and backrest. Figure 2 An exploded view of the armrests of the seat-back linkage chair; Figure 3 This is an enlarged view of the sliding fit between the guide pin and the guide groove; Figure 4 An enlarged view of the linkage unit inserting into the housing through the clearance groove; Figure 5 This is an enlarged view of the guide groove and guide pin in their initial state. Figure 6 This is a schematic diagram showing how the linkage rotates when the chair back is reclined, causing the guide pin to slide within the guide groove. Figure 7This is a schematic diagram showing that the extension trajectory of the guide groove is arc-shaped; Figure 8a This is a schematic diagram showing the sliding connection between the base and the seat; Figure 8b This is a schematic diagram showing the insertion part and the guide groove fitting together after the base plate is hidden. Figure 8c A sectional view showing the location of the insertion section; Figure 9 This is a schematic diagram showing the sliding connection between the base and the seat via a guide rail assembly. Figure 10 This is a schematic diagram of the connecting rod hinged between the side bracket and the linkage in Embodiment 2; Figure 11 This is a schematic diagram of how the linkage rotates when it rotates, causing the connecting rod to rotate and the chair seat to move forward, as shown in Example 2. The reference numerals in the attached drawings are as follows: 1-seat, 11-base, 12-side support, 13-guide pin, 14-guide groove, 15-insertion part, 16-positioning part, 17-fixed track, 18-sliding seat, 2-backrest, 3-armrest, 31-armrest bracket, 32-armrest support, 32a-limiting part, 321-armrest support shell, 322-armrest sealing plate, 33-cover plate, 34-avoidance groove, 4-linkage part, 41-lateral part, 42-vertical part, 43-guide groove, 44-connecting rod. Detailed Implementation

[0020] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0022] The specific embodiments of this utility model are as follows: Example 1: As Figure 1As shown in Figure 8, this embodiment provides a seat-back linkage chair, including a base 11, a backrest 2, and a seat 1. The seat 1 is slidably connected to the base 11. Armrests 3 are provided on the left and right sides of the base 11, and linkage parts 4 are provided on the left and right sides of the backrest 2. The linkage parts 4 are hinged to the corresponding armrests 3 and form rotation fulcrums. A trajectory guide structure is provided between each linkage part 4 and the seat 1. The trajectory guide structure includes a guide pin 13 provided on one of the linkage parts 4 and the seat 1, and a guide groove 43 provided on the other of the linkage parts 4 and the seat 1. The extending direction of the guide groove 43 is not parallel to the sliding direction of the seat 1. In this embodiment, only the structure in which the guide groove 43 is provided on the linkage part 4 and the guide pin 13 is provided on the seat 1 is illustrated, and this structure is used for explanation. The guide pin 13 is slidably engaged in the guide groove 43. Figure 5-6 As shown, when the backrest 2 is subjected to a backward leaning force, the linkage 4 rotates around the pivot point and pushes the seat 1 forward through the trajectory guide structure. At this time, the guide pin 13 slides in the guide groove 43, and the outer wall of the guide pin 13 and the inner wall of the guide groove 43 are pressed together to generate a forward component force on the seat 1, so that the seat 1 slides forward along a predetermined posture. The predetermined posture of the seat 1 is a horizontal posture that slides straight forward. When the linkage 4 rotates, the seat 1 can slide straight forward without generating an upward lifting force on the occupant, and the rotation process of the linkage 4 is transformed into the forward sliding process of the seat 1. When the linkage 4 rotates, since the extension direction of the guide groove 43 is not parallel to the sliding direction of the seat 1, the guide groove 43 can form a longitudinal avoidance effect on the guide pin 13, and will not directly generate an upward lifting force on the seat 1; thus improving the sitting experience.

[0023] Furthermore, such as Figures 8a-8cAs shown, the base 11 and the seat 1 are provided with a sliding guide structure, which can guide the seat 1 to slide back and forth. In this embodiment, the sliding guide structure can be as follows: the sliding guide structure includes a guide groove 14 extending back and forth on one of the base 11 and the seat 1, and an insertion part 15 on the other of the base 11 and the seat 1. The insertion part 15 is inserted into the guide groove 14, so that the seat 1 is slidably connected to the base 11. In this embodiment, the guide groove 14 is provided on the seat 1 and the insertion part 15 is provided on the base 1 for description. Specifically, the seat 1 includes a seat support part, which includes a seat shell with an opening at the top and a seat plate fixedly connected to the opening. A groove is provided at the bottom of the seat shell, and the groove extends forward and backward. Extending backward, the base 1 is located within a groove and does not protrude downward from the bottom of the seat shell, making the shape of the seat more concise and aesthetically pleasing. The base 1 has symmetrical guide grooves 14 extending forward and backward, and the corresponding insertion part 15 is fixedly connected to the bottom surface of the seat plate. The cross-sectional shape of the insertion part 15 is roughly T-shaped, which includes a wide part and a narrow part. The narrow part is inserted into the guide groove 14, and the wide part abuts against the upper end of the base 1. At the same time, to prevent the insertion part 15 from detaching upward from the guide groove 14, the bottom end of the narrow part is connected by screws to a positioning part 16 that abuts against the lower end of the base 1. The width of the positioning part 16 is greater than that of the narrow part. After assembly, the positioning part 16 and the insertion part 15 form an I-shaped structure, so that the seat 1 will not detach from the base 11 when it slides on the base 11 in the forward and backward direction.

[0024] Furthermore, such as Figure 9 As shown, in this embodiment, the sliding guide structure can also be a guide rail assembly between the base 11 and the seat 1. The guide rail assembly includes a fixed rail 17 and a sliding seat 18 that slides back and forth on the fixed rail 17. The fixed rail 17 and the sliding seat 18 are respectively connected to the base 11 and the seat 1 to guide the seat 1 to slide back and forth. The guide rail assembly composed of the fixed rail 17 and the sliding seat 18 is common in the market and is equivalent to a sliding guide module. This embodiment only illustrates the structure of one type of guide rail assembly. Specifically, the guide rail assembly is usually arranged symmetrically between the base 11 and the seat 1. The fixed rail 17 has a strip-shaped guide groove that extends back and forth, and the fixed rail 17 is also provided with a strip-shaped slot that extends back and forth and communicates with the strip-shaped guide groove. The width of the strip-shaped slot is smaller than the width of the strip-shaped guide groove. The cross-section of the sliding seat 18 is formed into a T-shaped structure, including a horizontal part with a larger width and a vertical part with a smaller width. The horizontal part is slidably connected in the strip-shaped guide groove, and the vertical part extends out of the strip-shaped slot and connects with the seat 1 to guide the seat 1 to slide back and forth.

[0025] Furthermore, in this embodiment, the extending direction of the guide groove 43 is not parallel to the sliding direction of the seat 1. This is to mitigate the longitudinal force exerted on the seat 1 by the rotating linkage 4, allowing the seat 1 to slide horizontally only in the front-to-back direction. Specifically, in this embodiment, the guide groove 43 extends directly upwards from bottom to top; or, the guide groove 43 extends obliquely upwards or backwards; the extension trajectory of the guide groove 43 is either straight or curved. Figure 7 As shown, when the extension trajectory of the guide groove 43 is arc-shaped, the arc-shaped trajectory is not concentric with the arc-shaped trajectory generated by the rotation of the linkage part 4, so that the linkage part 4 can generate a forward component force on the seat 1 when it rotates; when the linkage part 4 rotates, the guide pin 13 is also driven. At this time, while the seat 1 moves forward, the guide groove 43 can avoid the guide pin 13 in the longitudinal direction to avoid jamming.

[0026] Furthermore, such as Figure 1-3 As shown, the armrest 3 includes an armrest bracket 31 and an armrest support 32 mounted on the armrest bracket 31 for supporting the arms. The two armrest brackets 31 can be individually connected to the base 11, or they can be connected as a single unit before being attached to the base 11. The top of the armrest support 32 has an armrest surface for supporting the arms. To prevent the linkage part 4 from contacting the arms and to allow the linkage part 4 sufficient rotation space, in this embodiment, in the initial state, the linkage part 4 is positioned as far below the armrest support surface as possible, maintaining a certain distance from it. The armrest support 32 includes a support part located at the top of the armrest bracket 31, and a support... A side connecting part extends downward from one end of the inner side of the support part, and the linkage part 4 is hinged to the side connecting part, so that the overall height of the linkage part 4 is lower than the armrest support surface; in order to improve the aesthetics of the seat, the armrest support 32 formed by the support part and the side connecting part is a shell structure. The shell is provided with a relief groove 34 corresponding to the linkage part 4. The linkage part 4 passes through the relief groove 34 and enters the shell structure, and is hinged to the shell; specifically, the shell structure includes an armrest support shell 321 with an inner opening, and the relief groove 34 is provided on the armrest support shell 321; an armrest sealing plate 322 is matched and connected to the opening, hiding a large part of the linkage part 4 inside the shell, thus improving the aesthetics of the seat.

[0027] Furthermore, the handrail support shell 321 has multiple buckles inside, and the handrail sealing plate 322 has multiple corresponding buckles. The corresponding buckles engage with the buckles and buckles to fix the handrail sealing plate 322 to the handrail support shell 321. At the same time, a cover plate 33 is fixedly connected to the handrail sealing plate 322 to cover the buckles and buckles.

[0028] Furthermore, such as Figure 4As shown, to avoid safety issues caused by excessive rotation angle of the linkage part 4, the armrest 3 is provided with two limiting parts 32a located on the front and rear sides of the linkage part 4, respectively. In this embodiment, the limiting parts 32a are set on the armrest support shell 321; the rotation range of the linkage part 4 is limited between the two limiting parts 32a; when the backrest 2 is tilted back to the maximum angle, the front limiting part 32a can limit the linkage part 4 from continuing to rotate; when the backrest 2 returns to its original position, the rear limiting part 32a can abut against the linkage part 4, keeping it in its initial position.

[0029] Furthermore, to ensure that the backrest 2 and seat 1 can smoothly return to their initial positions when the backward external force on the backrest 2 is removed, an elastic element (not shown) can be installed between the base 11 and the seat 1. The elastic element can be a compression spring or a tension spring. Taking a tension spring as an example, the two ends of the tension spring can be hooked onto the base 1 and the seat 1 respectively. When the backrest 2 is tilted back, the seat 1 moves forward and causes the tension spring to deform. When the back of the person sitting leaves the backrest 2, the tension spring 2 can release the elastic force stored in the deformation, so that the seat 1 and backrest 2 return to their initial positions.

[0030] Furthermore, if the handrail support 32 has no side connection part, but only a support part and a corresponding handrail support surface, the linkage part 4 in this embodiment can also be hinged to the handrail bracket 31; so that the overall height of the linkage part 4 is lower than the handrail support surface, the same effect of avoiding the arm can be achieved.

[0031] Furthermore, in this embodiment, the shape of the linkage part 4 is not limited; it can be plate-shaped or rod-shaped. In this embodiment, the linkage part 4 is preferably an L-shaped rod structure. The linkage part 4 includes a horizontal part 41 and a vertical part 42. The rotation fulcrum is located at the junction of the horizontal part 41 and the vertical part 42 to ensure efficient force transmission. The horizontal part 41 is connected to the backrest 2. The vertical part 42 is used for linkage with the seat 1. Specifically, the seat 1 includes a seat support part (i.e., the aforementioned seat shell and seat plate) that is slidably connected to the base 11, and side brackets 12 disposed on both sides of the seat support part. The side brackets 12 are located below the rotation fulcrum, so that the trajectory guide structure is as far away from the rotation fulcrum as possible, and are disposed between the vertical part 42 and the side brackets 12.

[0032] Example 2: Figure 10-11As shown, this embodiment presents another type of seat-back linkage chair. The only difference between this seat-back linkage chair and the previous embodiment is that the trajectory guide structure between each linkage part 4 and the seat 1 includes a connecting rod 44 disposed between the linkage part 4 and the seat 1. The two ends of the connecting rod 44 are respectively hinged to the linkage part 4 and the seat 1. When the backrest 2 rotates backward, the linkage part 4 rotates around the pivot point and pushes the seat 1 forward through the trajectory guide structure. At this time, the connecting rod 44 rotates to dissipate the lifting force on the seat generated by the rotation of the linkage part and generates a forward component force on the seat 1, thereby linking the seat 1 to slide forward; achieving the same lateral linkage effect as in the previous embodiment.

[0033] The present invention and its embodiments have been described above illustratively. This description is not restrictive, and the figures shown are only one embodiment of the present invention; the actual structure is not limited thereto. Therefore, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A seat-back linkage chair, characterized by, The chair includes a base (11), a backrest (2), and a seat (1). The seat (1) is slidably connected to the base (11). Armrests (3) are provided on the left and right sides of the base (11). Linkage parts (4) are provided on the left and right sides of the backrest (2). The linkage parts (4) are hinged to the corresponding armrests (3) and form a rotation fulcrum. A trajectory guide structure is provided between each linkage part (4) and the seat (1). The trajectory guide structure includes a guide pin (13) provided on one of the linkage parts (4) and the seat (1), and a guide groove (43) provided on the other of the linkage parts (4) and the seat (1). The extension direction of the guide groove (43) is not parallel to the sliding direction of the seat (1). The guide pin (13) is slidably engaged in the guide groove (43). When the backrest (2) is subjected to a backward leaning force, the linkage part (4) rotates around the rotation fulcrum and pushes the seat (1) forward through the trajectory guide structure, so that the linkage seat (1) slides forward along a predetermined posture.

2. The seat-back linkage chair of claim 1, wherein: The base (11) and the seat (1) are provided with a sliding guide structure, which can guide the seat (1) to slide back and forth.

3. The seat-back linkage chair according to claim 2, characterized in that: The sliding guide structure includes a guide groove (14) extending forward and backward on one of the base (11) and the seat (1), and an insert (15) on the other of the base (11) and the seat (1). The insert (15) is inserted into the guide groove (14) to guide the seat (1) forward and backward.

4. The seat-back linkage chair according to claim 2, characterized in that: The sliding guide structure is a guide rail assembly between the base (11) and the seat (1). The guide rail assembly includes a fixed rail (17) and a sliding seat (18) that slides back and forth on the fixed rail (17). The fixed rail (17) and the sliding seat (18) are respectively connected to the base (11) and the seat (1) to guide the seat (1) to slide back and forth.

5. The seat-back linkage chair according to claim 1, characterized in that: The seat (1) is intended to slide horizontally forward.

6. The seat-back linkage chair according to claim 1, characterized in that: From bottom to top, the guide groove (43) extends directly upward; or, the guide groove (43) extends obliquely upward or backward.

7. The seat-back linkage chair according to claim 1 or 6, characterized in that: The extension trajectory of the guide groove (43) is either straight or curved.

8. The seat-back linkage chair according to claim 1, characterized in that: The handrail (3) includes a handrail bracket (31) and a handrail support (32) provided on the handrail bracket (31) for supporting the arm. The handrail support (32) includes a support portion located at the top of the handrail bracket (31), a side connection portion extending downward from one end of the inner side of the support portion, and a linkage portion (4) hinged to the side connection portion.

9. The seat-back linkage chair according to claim 1, characterized in that: The handrail (3) includes a handrail bracket (31) and a handrail support (32) set at the top of the handrail bracket (31) for supporting the arm. The linkage (4) is hinged to the handrail bracket (31).

10. The seat-back linkage chair according to claim 1, characterized in that: The linkage part (4) is L-shaped and includes a horizontal part (41) and a vertical part (42). The rotation fulcrum is located at the junction of the horizontal part (41) and the vertical part (42). The horizontal part (41) is connected to the backrest (2). The seat (1) includes a seat support part that is slidably connected to the base (11) and a side bracket (12) located on both sides of the seat support part and below the rotation fulcrum. The trajectory guide structure is located between the vertical part (42) and the corresponding side bracket (12).

11. The seat-back linkage chair according to claim 1, characterized in that: The handrail (3) is provided with two limiting parts (32a) located on the front and rear sides of the linkage part (4) respectively, and the rotation range of the linkage part (4) is limited between the two limiting parts (32a).

12. A seat-back linkage chair, characterized in that, The chair includes a base (11), a backrest (2), and a seat (1). The seat (1) is slidably connected to the base (11). The base (11) has armrests (3) on its left and right sides. The backrest (2) has linkage parts (4) on its left and right sides. The linkage parts (4) are hinged to the corresponding armrests (3) and form a rotation fulcrum. Each linkage part (4) is connected to the seat (1) via a trajectory guide structure. The trajectory guide structure includes a connecting rod (44) between the linkage part (4) and the seat (1). The two ends of the connecting rod (44) are hinged to the linkage part (4) and the seat (1) respectively. When the backrest (2) rotates backward, the linkage part (4) rotates around the rotation fulcrum and pushes the seat (1) forward through the trajectory guide structure, so that the seat (1) slides forward.

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