A transverse moving backrest chair

Abstract

The utility model discloses a kind of horizontal movement type backrest chairs, including seat subassembly and chair back component, chair back component includes back support and backrest;Seat subassembly includes pedestal, back support includes vertical support part for installing backrest, sliding part connected with vertical support part, sliding part is slidably connected on pedestal along front-back direction;By setting drive assembly between pedestal and the sliding part of back support, swing lever, connecting rod, sliding part jointly constitute crank slider mechanism, when telescopic drive piece telescopic shorter length and drive swing lever or connecting rod swing, sliding part can slide longer distance, satisfy backrest demand, so that the telescopic drive piece of shorter length can also drive chair back component to carry out large-scale backrest support in front-back direction, reduce the cost of telescopic drive piece and the assembly difficulty of backrest chair.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to a transverse backrest chair. Background Technology

[0002] To meet the needs of users, chairs with backrest tracking functions have appeared on the market. For example, the study chairs commonly used by children have backrest tracking functions. When the position of a child's back changes, the backrest of the chair can automatically follow the back and provide support.

[0003] For example, in the chair patent with publication number CN220675602, there is a backrest and a seat. The backrest and the gas spring are linked by a connecting rod. An outer cover (equivalent to a back support) is connected to the connecting rod. A backrest support seat for connecting the backrest is installed on the outer cover. The connecting rod is hinged to the second connecting rod of the transmission assembly. The lower end of the seat is provided with a mounting seat. The gas spring and the transmission assembly are both set in the mounting seat. The gas spring can push the first connecting rod in the transmission assembly to move, causing the backrest to rotate back and forth and form a backrest support. However, the angle of the backrest relative to the seat will also change when the backrest rotates back and forth. It does not move completely in the back and forth direction. Therefore, it cannot completely fit the back during the backrest support process.

[0004] Based on this, if the goal is to achieve the purpose of backrest lateral movement for back support, theoretically, the back support can be slidably connected to the mounting base in the front-back direction, and then the gas spring in the mounting base can be directly connected to the back support to drive the back support to slide and drive the backrest to move back and forth. However, this requires the piston rod extension stroke of the gas spring to be greater than or equal to the front-back sliding stroke of the back support. Therefore, the length of the gas spring needs to be designed to be larger, which not only makes the gas spring occupy a lot of front-back space in the mounting base, but also increases the difficulty of gas spring assembly and raises the manufacturing cost of the seat. Summary of the Invention

[0005] This utility model provides a transverse backrest support chair. By setting a drive component between the base and the sliding part of the back support, the swing rod, connecting rod, and sliding part together form a crank-slider mechanism. When the telescopic drive extends or retracts a short length and drives the swing rod or connecting rod to swing, the sliding part can slide a longer distance to meet the backrest support requirements. This allows the shorter telescopic drive component to drive the chair back assembly to provide a wide range of backrest support in the front-back direction, reducing the cost of the telescopic drive component and the assembly difficulty of the backrest support chair.

[0006] The technical solution of this utility model is implemented as follows: A lateral sliding backrest chair includes a seat assembly and a backrest assembly. The backrest assembly includes a back support and a backrest. The seat assembly includes a base. The back support includes a vertical support for mounting the backrest and a sliding part connected to the vertical support. The sliding part is slidably connected to the base in a front-back direction. A drive assembly is provided between the sliding part and the base. The drive assembly includes a linkage assembly and a telescopic drive member whose length can be changed by extension and retraction. The linkage assembly includes a swing rod and a connecting rod that are rotatably connected to the base and the sliding part, respectively. The swing rod and the connecting rod are rotatably connected to each other. The swing rod, the connecting rod, and the sliding part constitute a crank-slider mechanism. The telescopic drive member can push the swing rod or the connecting rod to rotate by its own extension and retraction, and move the sliding part back and forth to change the front and back positions of the back support and the backrest.

[0007] Preferably, when the telescopic drive extends or retracts in the first stroke, it can drive the swing arm to rotate, and through the linkage assembly, the sliding part moves back and forth in a second stroke greater than the first stroke; so that the telescopic drive can drive the sliding part to slide a longer distance with a shorter extension or retraction distance, thus meeting the backrest's backrest support requirements.

[0008] Preferably, the base is a hollow structure, and the drive component is disposed inside the base; the drive component is disposed between the base and the sliding part; thus avoiding exposure of the drive component and making the seat look simple and beautiful.

[0009] Preferably, the seat assembly includes a seat and a base disposed at the lower end of the seat, wherein the base is either the base or the seat.

[0010] Preferably, the base and the sliding part are slidably connected by a guide rail, and a connection point is formed at the rotatable connection position of the connecting rod and the sliding part. When the telescopic drive extends and retracts and drives the swing rod to rotate, the connecting rod pulls the sliding part to slide back and forth along the guide rail through the connection point.

[0011] Preferably, the guide rail is a guide groove that runs through the base and is symmetrical on both sides. The sliding part is provided with a side extension corresponding to the position of the guide groove. A pin is slidably connected in both guide grooves. Both ends of the pin pass through the corresponding guide groove and are connected to the corresponding side extension. The connecting rod is rotatably connected to the sliding part through the pin.

[0012] Preferably, the telescopic drive component is a gas spring or an electric push rod whose length can be changed by telescopic movement.

[0013] Preferably, one end of the gas spring or electric actuator is hinged to the base, and the other end of the gas spring or electric actuator is hinged to the connecting rod or swing rod; or, the other end of the gas spring or electric actuator is hinged to the rotational connection position between the connecting rod and the swing rod.

[0014] Preferably, the telescopic drive component is a gas spring whose length can be changed by telescopic movement; the gas spring is a self-locking gas spring with a self-locking device.

[0015] Preferably, the telescopic drive component is a mechanical spring that can change its length under the action of external force.

[0016] Preferably, the mechanical spring is a tension spring or a compression spring, with one end connected to the base and the other end connected to the connecting rod or the swing rod; or, the other end of the tension spring or compression spring is connected at the rotational connection position between the connecting rod and the swing rod.

[0017] The beneficial effects of this utility model, which adopts the above technical solution, are as follows: In this invention, the swing rod, connecting rod, and sliding part together constitute a crank-slider mechanism. The swing rod is equivalent to a crank, the sliding part is equivalent to a slider, and the connecting rod is equivalent to a connecting rod between the slider and the crank. The connecting rod and the crank together form a swing arm with a variable length. Since the telescopic drive acts on the crank or connecting rod and is far away from the rotating connection end between the connecting rod and the slider, when the telescopic drive extends or retracts with a small stroke, it can drive the swing arm formed by the crank and connecting rod to rotate and link the sliding part to slide a longer linear distance. This is equivalent to amplifying the forward and backward sliding stroke of the sliding part. As a result, only a telescopic drive with a small length is needed in the backrest chair to meet the needs of the back support and backrest to move in a wide range in the forward and backward direction and provide backrest support. Moreover, the smaller telescopic drive is less expensive and easier to install in the corresponding position of the backrest chair. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the exterior of a transverse sliding backrest chair; Figure 2 This is a schematic diagram showing the chair back assembly in a rearward position. Figure 3 This is a cross-sectional view of the drive assembly when the backrest assembly is in the rearmost position. Figure 4 This is a schematic diagram showing the chair back assembly in a forward position. Figure 5 This is a cross-sectional view of the drive assembly when the backrest assembly is in the forward position. Figure 6 This is a schematic diagram showing the shape of the chair when the seat and base are separated. Figure 7 This is a schematic diagram showing the drive components installed inside the base; Figure 8 This is a schematic diagram showing the connections of each component in the drive assembly; Figure 9 An exploded view of the driving component; Figure 10 This is a schematic diagram of the telescopic drive component being a tension spring in Example 2; Figure 11 This is a schematic diagram of the telescopic drive component being a compression spring in Example 2; Figure 12 A simplified schematic diagram of the crank-slider mechanism consisting of a swing arm, a connecting rod, and a sliding part; The reference numerals in the attached figures are as follows: 1-seat, 11-mounting groove, 2-backrest support, 2a-sliding part, 2b-vertical support part, 21-backrest, 22-side extension, 23-guide groove, 3-base, 31-guide groove, 32-accommodating groove, 4-swing rod, 41-connecting rod, 42-pin, 43-push seat, 5-gas spring, 5a-tension spring, 5b-compression spring. Detailed Implementation

[0019] 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.

[0020] 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.

[0021] This utility model has multiple embodiments, the specific embodiments of which are as follows: Example 1: As Figure 1-9 , Figure 12As shown, this embodiment provides a transverse sliding backrest chair, including a seat assembly and a backrest assembly. The backrest assembly includes a back support 2 and a backrest 21. The seat assembly includes a base. In this embodiment, the back support 2 is located at the rear of the seat assembly. The back support 2 includes a vertical support 2b for mounting the backrest 21 and a sliding part 2a connected to the vertical support 2b. In this embodiment, the sliding part 2a is located at the bottom end of the vertical support 2a, and the two form an L-shaped back support 2. The sliding part 2a is slidably connected to the base in the front-back direction. A driving assembly is provided between the sliding part 2a and the base. The driving assembly includes a linkage assembly and a telescopic driving member whose length can be changed by extension and retraction. The definition of a telescopic drive component is mainly based on whether it can change its own length, and not simply on interlocking telescopic structures; that is, a telescopic drive component can be an interlocking telescopic structure, or a component that changes its own length under external force; the linkage assembly includes a swing rod 4 and a connecting rod 41 that are rotatably connected to the base and the sliding part 2a, respectively. In this embodiment, the shape of the swing rod 4 and the connecting rod 41 is not limited. The swing rod 4 and the connecting rod 41 can be straight rods. Under the premise of improving structural strength, the swing rod 4 and the connecting rod 41 can also be a structure with a certain width in the left and right direction and roughly plate-shaped; the swing rod 4 and the connecting rod 41 are rotatably connected to each other; such as Figure 2-5 As shown, the swing rod 4, connecting rod 41, and sliding part 2a constitute a crank-slider mechanism; the crank-slider mechanism can be a concentric crank-slider mechanism or an offset crank-slider mechanism; in this embodiment, only the offset crank-slider mechanism is shown; the telescopic drive can push the swing rod 4 or connecting rod 41 to rotate by its own telescopic movement, and move the sliding part 2a back and forth to change the front and back positions of the back support 2 and the backrest 21.

[0022] Furthermore, such as Figure 12As shown, in this embodiment, the swing rod 4 is equivalent to a crank, the sliding part 2a is equivalent to a slider, and the connecting rod 41 is equivalent to a connecting rod between the slider and the crank. The connecting rod and the crank together form a swing arm with a variable length. In this embodiment, the length of the swing arm is the length from the rotating connection end of the crank and the base to the rotating connection end of the connecting rod and the slider. Since the telescopic drive acts on the crank or the connecting rod and is away from the rotating connection end of the connecting rod and the slider, the telescopic drive only needs to extend or retract a short length to make the swing rod 4 swing backward. At this time, the connecting rod gradually approaches the horizontal, and the length of the swing arm gradually increases, thereby causing the slider to slide backward to a larger straight length. When the swing rod 4 rotates forward, the connecting rod gradually approaches the tilt and pulls the slider to slide backward to a larger straight length. This is equivalent to extending the shorter extension stroke of the telescopic drive through... The crank-slider mechanism is converted into a longer linear sliding stroke of the slider, thus amplifying the stroke. In this embodiment, it is applied to the back support 2 and the backrest 21 in the back-pushing transmission process, which amplifies the stroke of the back support 2 and meets the back-pushing support requirements. Specifically, when the telescopic drive extends or retracts in the first stroke, it can drive the swing rod 4 to rotate, and through the linkage assembly, the sliding part 2a moves back and forth in a second stroke that is greater than the first stroke. This allows the telescopic drive to extend or retract a shorter distance, which can drive the sliding part 2a to slide a longer distance, thus meeting the backrest 21's back-pushing support requirements. Since the telescopic drive only needs to extend or retract a short stroke, a telescopic drive with a shorter stroke can be selected, thereby reducing the cost and volume of the telescopic drive, reducing the assembly difficulty, and making it easier to install in the corresponding position.

[0023] Furthermore, to facilitate the placement of the drive assembly, the base in this embodiment has a hollow structure, and the drive assembly is disposed within the base; moreover, the drive assembly is positioned between the base and the sliding portion 2a; this avoids exposing the drive assembly, making the seat appear simple and aesthetically pleasing; even further, such as Figure 6-9 As shown, the chair seat assembly includes a chair seat 1 and a base 3 disposed at the lower end of the chair seat 1. The base can be the chair seat 1, and a hollow groove can be provided on the chair seat 1, with the drive component disposed inside the groove; alternatively, the base 3 can be a hollow structure, with the drive component disposed inside the base 3. In this embodiment, the drive component is disposed inside the base 3 for explanation. Specifically, to reduce the abruptness of the base 3 at the lower end of the chair seat 1, a mounting groove 11 is provided at the lower end of the chair seat 1, and the base 3 is disposed at the mounting groove 11 to reduce the portion of the base 3 protruding from the lower end of the chair seat 1; at the same time, the base 3 is provided with an accommodating groove 32 with an upper opening, and the drive component is disposed inside the accommodating groove 32 and will not be exposed, ensuring the simple and beautiful appearance of the chair; in addition, a guide groove 23 is provided on the sliding part 2a of the backrest support 2, and the base 3 is disposed inside the guide groove 23, so that the sliding part 2a can slide in the front-back direction, but will not move in the left-right direction.

[0024] Furthermore, to make the sliding connection between the base and the sliding part 2a more stable, the base and the sliding part 2a are slidably connected by a guide rail. The connecting rod 41 and the sliding part 2a are connected at a rotatable position. When the telescopic drive extends and retracts and drives the swing rod 4 to rotate, the connecting rod 41 pulls the sliding part 2a to slide back and forth along the guide rail through the connection point. The guide rail is a through-type and symmetrical guide groove 31 on the base. The guide groove 31 extends in the front-back direction. The sliding part 2a is provided with a side extension 22 corresponding to the position of the guide groove 31. A pin 42 is slidably connected in both guide grooves 31. The position of the connection point corresponds to the position of the pin 42. Both ends of the pin 42 pass through the corresponding guide groove 31 and are connected to the corresponding side extension 22. The connecting rod 41 is rotatably connected to the sliding part 2a through the pin 42. When the telescopic drive extends and retracts, the swing rod 4 swings and drives the connecting rod 41 to rotate, thereby moving the pin 42 and the sliding part 2a connected to the pin 42 back and forth.

[0025] Furthermore, the telescopic drive component is a gas spring 5 or an electric push rod (not shown) whose length can be changed by telescopic movement. The gas spring 5 and the electric push rod have similar structures, both including a cylinder and a piston rod slidably connected to the cylinder. To prevent the piston rod of the gas spring 5 or the electric push rod from jamming during telescopic movement, in this embodiment, one end of the gas spring 5 or the electric push rod is hinged to the base, and the other end of the gas spring 5 or the electric push rod is hinged to the connecting rod 41 or the swing rod 4. Alternatively, the other end of the gas spring 5 or the electric push rod can also be hinged to the rotational connection position between the connecting rod 41 and the swing rod 4. All these hinge methods can ensure that the hinge position of each telescopic drive component with the connecting rod 41 or the swing rod 4 is far away from the hinge position between the connecting rod 41 and the sliding part 2a, thereby achieving a stroke amplification effect.

[0026] Furthermore, when the gas spring 5 or electric push rod is hinged, the outer end of the piston rod can be hinged to the base, and the outer end of the cylinder can be hinged to the connecting rod 41 or the swing rod 4. Alternatively, the positions of the outer end of the piston rod and the outer end of the cylinder can be interchanged. This allows the gas spring 5 or electric push rod to rotate adaptively when the piston rod extends or retracts, preventing jamming.

[0027] Furthermore, in this embodiment, the telescopic drive component is preferably a gas spring 5 whose length can be changed by telescoping. The gas spring 5 can be a normally open gas spring located at the rear of the linkage assembly. The normally open gas spring has a piston rod that always extends outward, which can push the swing rod 4 to rotate forward, so that the sliding part 2a always has a tendency to slide forward. When the seated person leans back against the backrest 21, the sliding part 2a will slide backward and the piston rod will elastically retract, so that the backrest 21 provides elastic support for the back. The gas spring 5 can also be a normally closed gas spring located at the front of the linkage assembly. The normally closed gas spring has a piston rod that always retracts inward, which can pull the swing rod 4 to rotate forward. The sliding part 2a always tends to slide forward; when the occupant leans back against the backrest 21, the sliding part 2a slides backward and the piston rod extends elastically, so that the backrest 21 provides elastic support to the back; in addition, to facilitate control of the sliding position of the sliding part 2a, each gas spring 5 in this embodiment is preferably a self-locking gas spring with a self-locking device; the self-locking device of the self-locking gas spring is connected to a pull wire, and the other end of the pull wire is connected to a control switch, which can control the piston rod to unlock or lock at the corresponding position; after the sliding part 2a slides to the corresponding position, it can switch between the locked and unlocked states; the principle and structure of the self-locking device are existing technologies and will not be described in detail here.

[0028] Example 2: As Figure 10-11 As shown, the difference between this embodiment and the above embodiments is that the telescopic drive component in this embodiment is a mechanical spring that can change its length under the action of external force; the mechanical spring is a tension spring 5a or a compression spring 5b, one end of the tension spring 5a or the compression spring 5b is connected to the base, and the other end of the tension spring 5a or the compression spring 5b is connected to the connecting rod 41 or the swing rod 4; or, the other end of the tension spring 5a or the compression spring 5b is connected to the rotational connection position between the connecting rod 41 and the swing rod 4.

[0029] Specifically, when the mechanical spring is a tension spring 5a, the tension spring 5 is located at the front of the connecting rod assembly. To facilitate the installation of the tension spring 5, a lug can be provided on the swing rod 4 or connecting rod 41, and a lug can also be provided on the base so that both ends of the tension spring 5a are hooked onto the corresponding lugs. When the mechanical spring is a compression spring 5b, the compression spring 5b is located at the rear of the connecting rod assembly. To facilitate the installation of the tension spring 5a and prevent it from bending, a tube sleeve structure can be provided on the base, with one end of the compression spring 5b inserted into the tube sleeve and the other end exposed. It is located outside the tube sleeve and supported on the corresponding swing rod 4 or connecting rod 41; in order to adapt to the rotation trajectory of the swing rod 4 or connecting rod 41, a push seat 43 can also be rotatably connected to the swing rod 4 or connecting rod 41. The push seat 43 has an annular boss. The other end of the compression spring 5b is sleeved on the push seat 43 and acts on the annular boss. When the swing rod 4 or connecting rod 41 rotates, the push seat 43 can rotate adaptively so that the direction of the thrust of the compression spring 5b remains unchanged, and the compression spring 5b is prevented from bending when it deforms.

[0030] Furthermore, when the telescopic drive component uses a mechanical spring, in order to facilitate the unlocking and locking of the back support 2 and the backrest 21 in the front and rear positions, a gear control mechanism can be set between the base and the sliding part 2a. This mechanism includes multiple gear slots spaced apart on the base and a locking member movably set on the sliding part 2a. The locking member can also be connected to a pull cable, and the locking member can be engaged or disengaged from the corresponding gear slot by pulling the pull cable through a control switch, thereby locking or unlocking the position of the back support 2 and the backrest 21.

[0031] 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 transverse sliding backrest chair, characterized in that, The chair includes a seat assembly and a backrest assembly. The backrest assembly includes a back support (2) and a backrest (21). The seat assembly includes a base. The back support (2) includes a vertical support (2b) for mounting the backrest (21) and a sliding part (2a) connected to the vertical support (2b). The sliding part (2a) is slidably connected to the base in the front-back direction. A drive assembly is provided between the sliding part (2a) and the base. The drive assembly includes a linkage assembly and a telescopic drive member that can change its own length by telescopic extension. The linkage assembly includes a swing rod (4) and a connecting rod (41) that are rotatably connected to the base and the sliding part (2a) respectively. The swing rod (4) and the connecting rod (41) are rotatably connected to each other. The swing rod (4), the connecting rod (41), and the sliding part (2a) constitute a crank-slider mechanism. The telescopic drive member can push the swing rod (4) or the connecting rod (41) to rotate by its own telescopic extension, and move the sliding part (2a) back and forth to change the front and back positions of the back support (2) and the backrest (21).

2. The transverse sliding backrest chair according to claim 1, characterized in that: When the telescopic drive extends or retracts in the first stroke, it can drive the swing rod (4) to rotate and move back and forth in a second stroke greater than the first stroke through the linkage assembly and the sliding part (2a).

3. The transverse sliding backrest chair according to claim 1, characterized in that: The base is a hollow structure, and the driving component is disposed inside the base; and the driving component is disposed between the base and the sliding part (2a).

4. The transverse sliding backrest chair according to claim 1, characterized in that: The chair seat assembly includes a chair seat (1) and a base (3) disposed at the lower end of the chair seat (1), wherein the base is either the base (3) or the chair seat (1).

5. The transverse sliding backrest chair according to claim 1, characterized in that: The base and the sliding part (2a) are connected by a guide rail and slide back and forth. The connecting rod (41) and the sliding part (2a) are connected at a rotational connection point. When the telescopic drive extends and extends and drives the swing rod (4) to rotate, the connecting rod (41) pulls the sliding part (2a) to slide back and forth along the guide rail through the connection point.

6. The transverse sliding backrest chair according to claim 5, characterized in that: The guide rail is a guide groove (31) that runs through the base and is symmetrical on the left and right. The sliding part (2a) is provided with a side extension (22) corresponding to the position of the guide groove (31). A pin (42) is slidably connected in both guide grooves (31). Both ends of the pin (42) pass through the corresponding guide groove (31) and are connected to the corresponding side extension (22). The connecting rod (41) is rotatably connected to the sliding part (2a) through the pin (42).

7. The transverse sliding backrest chair according to claim 1, characterized in that: The telescopic drive component is a gas spring (5) or an electric push rod whose length can be changed by telescopic movement.

8. The transverse sliding backrest chair according to claim 7, characterized in that: One end of the gas spring (5) or electric push rod is hinged to the base, and the other end of the gas spring (5) or electric push rod is hinged to the connecting rod (41) or swing rod (4); or, the other end of the gas spring (5) or electric push rod is hinged to the rotational connection position of the connecting rod (41) and the swing rod (4).

9. The transverse sliding backrest chair according to claim 7, characterized in that: The telescopic drive component is a gas spring (5) whose length can be changed by telescopic movement; the gas spring (5) is a self-locking gas spring with a self-locking device.

10. The transverse sliding backrest chair according to claim 1, characterized in that: The telescopic drive component is a mechanical spring that can change its length under the action of external force.

11. The transverse sliding backrest chair according to claim 10, characterized in that: The mechanical spring is a tension spring (5a) or a compression spring (5b). One end of the tension spring (5a) or compression spring (5b) is connected to the base, and the other end of the tension spring (5a) or compression spring (5b) is connected to the connecting rod (41) or the swing rod (4); or, the other end of the tension spring (5a) or compression spring (5b) is connected to the rotational connection position between the connecting rod (41) and the swing rod (4).

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