Seat pan with infinitely adjustable reclining spring force

Abstract

The utility model discloses a kind of stepless adjustment reclining elastic force seat chassis, including pedestal and hinged on the backrest connecting piece of pedestal, backrest connecting piece can rotate back and forth relative to pedestal;Pedestal is also hinged with the swing piece located at the front side of backrest connecting piece, and elastic piece is equipped between swing piece and backrest connecting piece;By setting the stepless adjustment assembly of screw thread adjustment type on pedestal, operator only needs to rotate drive screw, so that swing piece can be accurately and smoothly rotated to predetermined position, and the reclining elastic force of elastic piece to backrest connecting piece is adjusted in place;It reduces the abrupt feeling and noise when reclining elastic force of seat chassis is adjusted, and improves the smoothness and accuracy of reclining elastic force adjustment.

Description

Technical Field

[0001] This utility model relates to the field of seating, and in particular to a seat chassis with stepless adjustable tilt elasticity. Background Technology

[0002] Most office chairs or ergonomic chairs have a seat base at the bottom of the seat. The seat base usually includes a base and a backrest connector that is rotatably connected to the base. The backrest connector is used to fix the backrest to allow the backrest to rotate and tilt. However, for diners with different weights and usage needs, the tilt resistance required when the backrest rotates forward and backward is also different. Therefore, the seat base usually has an elastic tilt adjustment mechanism to adjust the tilt elasticity of the backrest when it rotates forward and backward.

[0003] For example, in the chassis patent with publication number CN222382881, an adjustment seat and a tail seat for connecting to the chair back are rotatably provided on the base. An elastic element is provided between the adjustment seat and the tail seat. The base is provided with an adjustment rod and a rotatable stop plate. The adjustment rod and the stop plate are driven by a gear set. The stop plate has multiple stop slots. The adjustment seat is provided with a limiting rod that can be engaged with the corresponding stop slot. When adjusting the elastic force of the elastic element, the adjustment rod can be rotated and the stop plate can be rotated, so that the limiting rod switches between stop slots in different positions to increase or decrease the distance between the adjustment seat and the tail seat, so that the elastic element can provide different tilting elastic forces for the rear seat to rotate back and forth. However, the above-mentioned adjustment mechanism has shortcomings.

[0004] First, when adjusting the tilt, the limit lever can only switch from one gear slot to the next. Although the tilt spring force can be adjusted after switching, there is still an adjustment blind zone between every two adjacent gear slots, resulting in a defect in adjustment accuracy. Second, when the limit lever switches between multiple gear slots, the presence of frictional resistance causes significant noise and operational jerking at the chassis when the adjustment lever rotates. Therefore, the smoothness and quietness of the chassis's elastic tilt force adjustment need to be improved. Summary of the Invention

[0005] This utility model provides a variety of stepless adjustable tilt spring seat chassis. By setting a threaded adjustable stepless adjustment component on the base, the operator only needs to turn the drive screw to make the swing component rotate precisely and smoothly to the predetermined position, and adjust the tilt spring of the tension spring to the backrest connecting part in place; it reduces the jerking and noise when adjusting the tilt spring of the seat chassis, and improves the smoothness and accuracy of the tilt spring adjustment.

[0006] The technical solution of this utility model is implemented as follows: A stepless adjustable tilt and spring seat chassis includes a base and a backrest connector hinged to the base, the backrest connector being rotatable relative to the base; a swing member is also hinged to the base and located in front of the backrest connector, with an elastic element between the swing member and the backrest connector; a stepless adjustment assembly is provided on the base, the stepless adjustment assembly including a sliding seat and a lifting seat acting on the swing member, a drive screw threadedly connected to the sliding seat and passing through the base laterally, the drive screw being rotatable in place and driving the sliding seat to slide laterally; a linkage structure is provided between the sliding seat and the lifting seat, the linkage structure being configured such that when the sliding seat slides, the lifting seat is raised and lowered to cause the swing member to rotate. When the drive screw rotates in place, it can drive the lifting seat to push the swinging component to rotate and maintain the predetermined position, thereby changing the degree of deformation of the elastic component and adjusting the tilting elastic force of the chair back connector to the correct position.

[0007] Preferably, the linkage structure includes a linkage inclined surface that extends longitudinally on the sliding seat. When the sliding seat slides laterally, the linkage inclined surface forms a longitudinal component force on the lifting seat, causing the lifting seat to move and causing the swinging component to rotate.

[0008] Preferably, a local area of ​​the lower end face of the lifting seat is recessed and a guide groove extending laterally is formed, and the sliding seat is slidably connected in the guide groove to save space occupied by the stepless adjustment component.

[0009] Preferably, the sliding seat includes a sliding body, which has a through hole extending along the axis of the drive screw and a groove located on the extension trajectory of the through hole and communicating with the through hole. The groove has an internal threaded sleeve for threaded connection with the drive screw. It is not necessary to open a threaded hole on the sliding seat; it is only necessary to insert the internal threaded sleeve into the sliding seat.

[0010] Preferably, the swing member is an L-shaped link, which includes a swing arm rotatably connected to the base and an extension arm integrally connected to the swing arm. The lifting seat acts on the extension arm to cause the swing member to rotate. The extension arm can extend the force arm between the swing member and the lifting seat, and at the same time make the swing member as close to the lifting seat as possible, so that the operator only needs to apply a small circumferential rotational force to the drive screw to cause the swing member to rotate.

[0011] Preferably, the base includes a base plate and side plates on the left and right sides of the base plate, and each side plate is provided with a through hole corresponding to the position of the sliding seat; the drive screw includes a smooth section and a threaded section connected to each other, the threaded section is threadedly connected to the sliding seat, and the smooth section passes through the through hole; the smooth section is provided with two axially spaced limiting protrusions, and the two limiting protrusions abut against the inner and outer sides of the side plate where the through hole is provided, so as to restrict the drive screw from moving along its own axis.

[0012] Preferably, the backrest connector has a mounting portion, and the elastic element is a tension spring that is hooked between the swinging element and the mounting portion.

[0013] Preferably, the linkage structure includes a guide pin disposed on the sliding seat and an inclined guide groove disposed on the lifting seat and extending longitudinally. The guide pin is slidably connected in the inclined guide groove. When the sliding seat slides laterally, the guide pin slides in the inclined guide groove and forms a longitudinal component force on the lifting seat, causing the lifting seat to move and causing the swinging component to rotate.

[0014] A steplessly adjustable tilt and spring seat chassis includes a base and a backrest connector hinged to the base. The backrest connector is rotatable relative to the base. A swing member is hinged to the base and located in front of the backrest connector. An elastic element is provided between the swing member and the backrest connector. A steplessly adjustable assembly is provided on the base. The steplessly adjustable assembly includes a sliding seat acting on the swing member. A drive screw threadedly connected to the sliding seat and passing through the base laterally is provided. The drive screw can rotate in place and drive the sliding seat to slide laterally. One of the sliding seat and the swing member is provided with a longitudinally inclined linkage surface. The other of the sliding seat and the swing member is in contact with the linkage surface. When the drive screw rotates in place, it can drive the sliding seat to slide. At the same time, the swinging part rotates and maintains a predetermined position through the action of the linkage inclined plane, so as to change the degree of deformation of the elastic part, thereby adjusting the tilting elastic force of the chair back connecting part to the correct position.

[0015] A stepless adjustable tilt and spring seat chassis includes a base and a backrest connector hinged to the base. The backrest connector can rotate back and forth relative to the base. A swing member is hinged to the base and located in front of the backrest connector. An elastic member is provided between the swing member and the backrest connector. A stepless adjustment assembly is provided on the base. The stepless adjustment assembly includes a lifting seat that is slidably connected to the base in the longitudinal direction and acts on the swing member. A drive screw that passes through the base in the longitudinal direction is threaded onto the lifting seat. The drive screw can rotate in place and drive the lifting seat to slide longitudinally. When the drive screw rotates in place, it can drive the lifting seat to rise and fall, and at the same time, it can cause the swinging component to rotate and maintain a predetermined position, thereby changing the degree of deformation of the elastic component and adjusting the tilting elastic force of the backrest connector to the correct position.

[0016] The beneficial effects of this utility model, which adopts the above technical solution, are as follows: This invention features a stepless adjustment component driven by a drive screw on the base. When adjusting according to their needs, the operator only needs to rotate the drive screw to move the corresponding lifting seat or sliding seat and swing the swinging component to the predetermined position, so that the tension spring forms a corresponding tilting force on the chair back connector. Compared with the gear adjustment structure, the stepless adjustment has almost no blind spot and no significant jerking, greatly improving the accuracy and smoothness of the tilting force. At the same time, due to the self-locking property of the threaded connection, the sliding seat or lifting seat that has moved into place will not move in the opposite direction, so that the swinging component can be stably stopped at the predetermined position after rotation.

[0017] The lifting seat is provided with a laterally extending guide groove, which allows the sliding seat to be slidably connected in the guide groove. This not only provides lateral sliding guidance for the sliding seat but also reduces the space occupied by the stepless adjustment component on the chassis.

[0018] Compared to a linear structure, the L-shaped structure of the swing component can reduce the space occupied by the swing component while raising the lifting seat or sliding seat to exert force on the swing component, making the continuously variable adjustment component structure more compact. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the seat chassis. Figure 2 A structural diagram of the seat chassis with the bottom shell removed; Figure 3 This is a schematic diagram showing the tension spring connected between the swinging component and the connecting component. Figure 4 This is a structural diagram of the continuously variable adjustment component and the oscillating element; Figure 5 A cross-sectional view showing the position of the swinging component; Figure 6 A cross-sectional view showing the swing component rotating and causing the tension spring to deform further after the lifting seat rises. Figure 7 This is a schematic diagram of the continuously variable adjustment component. Figure 8 This is a cross-sectional view of the continuously variable adjustment component; Figure 9 An exploded view of the continuously variable adjustment component; Figure 10 This is a schematic diagram of the inner spiral sleeve fitting into the groove. Figure 11 This is a schematic diagram of a linkage structure consisting of a guide pin and an inclined guide groove; Figure 12-13 This is a cross-sectional view of the sliding seat acting on the swinging component via the linkage inclined plane in Example 2; Figure 14 This is a cross-sectional view of the threaded connection between the drive screw and the lifting seat in Example 3; The reference numerals in the attached drawings are as follows: 1-base, 11-seat connector, 12-connecting rod, 13-bottom shell, 14-guide rib, 2-backrest connector, 3-mounting part, 4-tension spring, 5-swinging part, 51-extension arm, 52-hanging groove, 6-lifting seat, 61-guide groove, 7-sliding seat, 7a-internal threaded sleeve, 7b-threaded hole, 71-linkage inclined surface, 72-through hole, 73-groove, 74-guide pin, 75-slanted guide groove, 8-drive screw, 81-threaded section, 82-limiting protrusion, 9-handle. 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] This utility model has several specific embodiments, and the specific implementation methods are as follows: Example 1: As Figure 1-11 As shown, this embodiment provides a seat chassis with stepless adjustable tilt elasticity, including a base 1 and a backrest connector 2 hinged to the base 1. The backrest connector 2 is hinged to a rear position of the base 1 and can rotate back and forth relative to the base 1; Figure 1-3 As shown, a seat connector 11 is provided at the upper end of the base 1. The backrest connector 11 can be fixedly connected to the base 1 or movably connected to the base 1. For example, in this embodiment, a connecting rod 12 is provided at the front position of the seat connector 11 and the front position of the base 1. The two ends of the connecting rod 12 are respectively hinged to the base 1 and the seat connector 11. The rear position of the seat connector 11 is hinged to the backrest connector 2, so that the seat connector 11, the base 1, the backrest connector 2, and the connecting rod 12 form a four-bar linkage mechanism. When the backrest connector 2 rotates back and forth, the seat connector 11 will also move back and forth in linkage.

[0023] Furthermore, a swing member 5 is hinged to the base 1, located in front of the backrest connector 2. An elastic element is provided between the swing member 5 and the backrest connector 2. The elastic element can be a compression spring or a tension spring 4. In this embodiment, only the structure of the elastic element being a tension spring 4 is shown. Specifically, the backrest connector 2 is provided with a mounting part 3, which is located at the upper part of the backrest connector 2. A tension spring 4 is connected between the swing member 5 and the mounting part 3. The number of tension springs 4 can be single or multiple in parallel. The longer their extension length, the greater the elastic resistance of the backrest connector 2 in tilting and rotating. In this embodiment, the mounting part 3 is a horizontal shaft provided on the backrest connector 2 and hooked to the corresponding end of the tension spring 4. The horizontal shaft can provide a mounting position for the tension spring 4 and can also serve as a support shaft for the hinge between the backrest connector 2 and the seat connector 11. The base 1 is provided with a stepless adjustment component, such as... Figure 7-9 As shown, the stepless adjustment assembly includes a sliding seat 7 and a lifting seat 6 acting on the swing member 5. A drive screw 8 is threadedly connected to the sliding seat 7 and passes through the base 1 in a transverse direction. The drive screw 8 and the sliding seat 7 are screwed together to form a screw and nut mechanism. The drive screw 8 can rotate in place and drive the sliding seat 7 to slide laterally. A linkage structure is provided between the sliding seat 7 and the lifting seat 6. The linkage structure is configured so that when the sliding seat 7 slides, the lifting seat 6 is raised and lowered to cause the swing member 5 to rotate. When the drive screw 8 rotates in place, it can drive the lifting seat 6 to push the swing member 5 to rotate and maintain a predetermined position, thereby changing the tension length of the tension spring 4 and adjusting the tilting force of the backrest connector 2 to the correct position; specifically, as Figure 6 As shown, in this embodiment, when the drive screw 8 rotates in place, the lifting seat 6 rises, causing the swing member 5 to rotate, and simultaneously increasing the tensile deformation of the tension spring 4, thereby increasing the tilting force of the tension spring 4 on the chair back connector 2; as Figure 5 As shown, when the drive screw 8 rotates in the opposite direction in place, the lifting seat 6 descends. Under the elastic force of the tension spring 4, the swinging component 5 will automatically rotate in the opposite direction and always be in close contact with the lifting seat 6, reducing the tilting elastic force of the tension spring 4 on the backrest connector 2. This stepless adjustment has almost no blind spots, and the whole adjustment process is relatively smooth. It will not produce a large sense of jerking and noise like the gear adjustment mechanism in the background technology, thus meeting the user's needs.

[0024] Furthermore, in this embodiment, the linkage structure can convert part of the lateral force generated by the lateral sliding of the sliding seat 7 on the lifting seat 6 into a longitudinal force that drives the lifting seat 6 to move up and down. Specifically, the base 1 includes a base plate and side plates located at the left and right edges of the base plate. The left and right lengths of the lifting seat 6 are matched with the distance between the two side plates to form a lifting guide for the lifting seat 6. The linkage structure includes a linkage inclined surface 71 that extends longitudinally on the sliding seat 7. When the sliding seat 7 slides laterally, the linkage inclined surface 71 forms a longitudinal component force on the lifting seat 6, causing the lifting seat 6 to move and causing the swing member 5 to rotate. When the sliding seat 7 slides laterally under the drive of the drive screw 5, the linkage inclined surface 71 causes the height of the contact position between the lifting seat 6 and the sliding seat 6 to change, thereby causing the lifting seat 6 to rise or fall, so as to make the swing member 7 rotate.

[0025] Furthermore, to further save space occupied by the stepless adjustment, in this embodiment, a guide groove 61 extending laterally is formed in a local area of ​​the lower end face of the lifting seat 6. The sliding seat 7 is slidably connected in the guide groove 61, so that there is no need to set a separate sliding groove on the base 1 to guide the sliding seat 7, which further improves the structural compactness of the stepless adjustment component.

[0026] Furthermore, such as Figure 10 As shown, the sliding seat 7 in this embodiment includes a sliding body. The sliding body is provided with a through hole 72 extending along the axis of the drive screw 8 and a groove 73 located on the extension trajectory of the through hole 72 and communicating with the through hole 72. The groove 73 is provided with an internal threaded sleeve 7a for threaded connection with the drive screw 8. The internal threaded sleeve 7a is usually a nut with a threaded hole 7b. The cross-sectional shape of the nut is usually non-circular. After the nut is embedded in the groove 73, it remains fixed relative to the sliding seat 7, so that when the drive screw 8 rotates, the nut will not rotate circumferentially with the drive screw 8, so that the sliding seat 7 can only move laterally. Therefore, it is not necessary to open a threaded hole 7b on the sliding seat 7. During installation, it is only necessary to embed the internal threaded sleeve 7a into the sliding seat 7.

[0027] Furthermore, the swing element 5 can be a straight-line swing arm, but it needs to be hinged to the base 1, hooked to the tension spring 4, and in contact with the lifting seat 6. Therefore, straight-line elements are easily limited by the space of the chassis during installation. To reduce the space occupied by the swing element 5, in this embodiment, the swing element 5 is an L-shaped connecting rod, such as... Figure 4As shown, the L-shaped connecting rod includes a swing arm rotatably connected to the base 1 and an extension arm 51 integrally connected to the swing arm. The swing arm extends laterally on both sides and forms a hooking part. The outer wall of the hooking part is concave and forms a hooking groove 52 for hooking with the tension spring 4. The lifting seat 6 acts on the extension arm 51 to cause the swing member 5 to rotate. The extension arm 51 can extend the force arm between the swing member 5 and the lifting seat 6, and at the same time make the swing member 5 as close as possible to the lifting seat 6. This allows the operator to apply only a small circumferential rotational force to the drive screw 8 to cause the swing member 5 to rotate, without causing the swing member 5 to occupy a large space. The design is ingenious and achieves multiple benefits.

[0028] Furthermore, the drive screw 8, which is mounted on the base 1, needs to rotate in place to ensure that the sliding seat 7, which is screwed to it, moves laterally. Specifically, each side plate of the base 1 has a through hole corresponding to the position of the sliding seat 7. The drive screw 8 includes a smooth section and a threaded section 81 connected to each other. The threaded section 81 is threadedly connected to the sliding seat 7, and the smooth section passes through the through hole. The smooth section has two axially spaced limiting protrusions 82, which constitute an axial limiting structure and abut against the inner and outer sides of the side plate with the through hole, respectively, to restrict the drive screw 8 from moving axially. The limiting protrusions 82 can be integrally formed with the smooth section or detachably connected to the smooth section. For example, in this embodiment, for ease of installation, the limiting protrusions 82 on the outer side of the side plate are integrally formed with the smooth section, and the limiting protrusions 82 on the inner side of the side plate are detachable annular parts or nuts. The smooth section has a retaining ring groove located inside the annular part or nut, and a retaining ring is installed in the retaining ring groove to restrict axial movement.

[0029] Furthermore, for ease of operation, the outer end of the drive screw 8 extends out of the base 1 and is fixedly connected to a handle 9, which is located on the outer end of the smooth section. The fixed connection of the handle 9 means that the handle 9 is relatively fixed to the drive screw 8 in the direction of circumferential rotation. The handle 9 can be integrally formed with the drive screw 8, or it can be connected to the drive screw 8 by a key, so that when the handle 9 rotates circumferentially, it can drive the drive screw 8 to rotate together.

[0030] Furthermore, such as Figure 11 As shown, this embodiment provides another linkage structure, which includes a guide pin 74 disposed on the sliding seat 7 and an inclined guide groove 75 disposed on the lifting seat 6 and extending longitudinally. The number of inclined guide grooves 75 can be single or multiple, and the number of guide pins 74 matches the number of inclined guide grooves 75. The guide pin 74 is slidably connected in the inclined guide groove 75. When the sliding seat 7 slides laterally, the guide pin 74 slides in the inclined guide groove 75 and forms a longitudinal component force on the lifting seat 6, which can also make the lifting seat 6 move and cause the swing member 5 to rotate, so as to achieve the same linkage effect as the above linkage structure.

[0031] Furthermore, the seat chassis also includes a bottom shell 13, which is a shell-like component with its upper end open to the outside. The bottom shell 13 encloses most of the components except for the seat connector 11 and the backrest connector 2, in order to improve the aesthetics and sealing of the seat chassis. At the same time, the bottom shell 13 has a through hole on its side corresponding to the position of the drive screw 8, so that the drive screw 8 can pass through and be fixedly connected to the handle 9.

[0032] Example 2: As Figure 12-13 As shown, the difference between this embodiment and the above embodiments is that, in embodiment 3: Figure 9 As shown, the difference between this embodiment and the above embodiment is that the lifting seat 6 is no longer provided in this embodiment. Instead, the swing member 5 is rotated by the sliding seat 7. Specifically, the stepless adjustment assembly of the seat chassis includes the sliding seat 7 acting on the swing member 5. To guide the sliding seat 7, guide ribs 14 located on both sides of the sliding seat 7 can be provided on the base 1. The extension direction of the guide ribs 14 is parallel to the sliding direction of the sliding seat 7. A drive screw 8 threadedly connected to the sliding seat 7 and passing through the base 1 in a transverse direction is provided. The drive screw 8 can rotate in place and drive the sliding seat 7 to slide laterally. One of the sliding seat 7 and the swing member 5 is provided with a linkage inclined surface 71 extending in a longitudinal direction. The other of the sliding seat 7 and the swing member 5 is in contact with the linkage inclined surface 71. In this embodiment, only the structure of the linkage inclined surface 71 provided on the sliding seat 7 is shown, and the explanation is based on it. When the drive screw 8 rotates in place, it can drive the sliding seat 7 to slide. At the same time, through the linkage inclined plane 71, the swing member 5 rotates and maintains a predetermined position, thereby changing the extension length of the tension spring 4, and thus adjusting the tilting elastic force of the backrest connector 2 to the correct position. Figure 13 As shown, as the sliding seat 7 slides laterally, the linkage inclined surface 71 causes the height position of the contact part between the sliding seat 7 and the swing member 5 to change. Specifically, when the drive screw 8 rotates in place, the swing member 5 rotates under the guidance of the linkage inclined surface 71, which increases the tensile deformation of the tension spring 4, thereby increasing the tilting force of the tension spring 4 on the backrest connector 2. When the drive screw 8 rotates in the opposite direction in place, the sliding seat 7 slides in the opposite direction. Under the action of the tension spring 4, the swing member 5 will automatically rotate in the opposite direction and always be in close contact with the sliding seat 7, reducing the tilting force of the tension spring 4 on the backrest connector 2, achieving the same adjustment effect as in the above embodiment.

[0033] Example 3: As Figure 14As shown, the difference between this embodiment and the above embodiment is that the sliding seat 7 is no longer provided in this embodiment, and the swinging member 5 is swayed only by the lifting seat 6. Specifically, the seat chassis includes a lifting seat 6 that is slidably connected to the base 1 in the longitudinal direction and acts on the swinging member 5. A drive screw 8 that passes through the base 1 in the longitudinal direction is threaded on the lifting seat 6. The drive screw 8 can rotate in place and drive the lifting seat 6 to slide longitudinally. In this embodiment, the direction of the drive screw 8 is changed, and the outer end of the drive screw 8 passes through a position below the seat chassis. The outer end can also be connected to a handle 9 for easy operation. In order to prevent the lifting seat 6 from shifting laterally when it is raised and lowered, this embodiment also provides guide ribs 14 on both sides of the sliding seat 7 on the base 1. The guide ribs 14 are perpendicular to the two side plates of the base 1. When the drive screw 8 rotates in place, it can drive the lifting seat 6 to rise and fall, while simultaneously causing the swinging component 5 to rotate and maintain a predetermined position, thereby changing the extension length of the tension spring 4 and adjusting the tilting force of the backrest connector 2 to the correct position. Specifically, when the drive screw 8 rotates in place, the lifting seat 6 can rise directly, increasing the extension deformation of the tension spring 4 and thus improving the tilting force of the tension spring 4 on the backrest connector 2. When the drive screw 8 rotates in the opposite direction in place, the lifting seat 6 descends, and under the action of the tension spring 4, the swinging component 5 will automatically rotate in the opposite direction and always remain in close contact with the sliding seat 7, reducing the tilting force of the tension spring 4 on the backrest connector 2, achieving the same adjustment effect as in the above embodiment.

[0034] 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 chassis with stepless adjustable tilt elasticity, characterized in that, The system includes a base (1) and a backrest connector (2) hinged to the base (1). The backrest connector (2) can rotate back and forth relative to the base (1). A swing member (5) located in front of the backrest connector (2) is also hinged to the base (1). An elastic member is provided between the swing member (5) and the backrest connector (2). A stepless adjustment assembly is provided on the base (1). The stepless adjustment assembly includes a sliding seat (7) and a lifting seat (6) acting on the swing member (5). A drive screw (8) threaded through the base (1) is threaded on the sliding seat (7). The drive screw (8) can rotate in place and drive the sliding seat (7) to slide laterally. A linkage structure is provided between the sliding seat (7) and the lifting seat (6). The linkage structure is configured such that when the sliding seat (7) slides, the lifting seat (6) moves up and down to cause the swing member (5) to rotate. When the drive screw (8) rotates in place, it can drive the lifting seat (6) to push the swinging part (5) to rotate and maintain the predetermined position, so as to change the degree of deformation of the elastic part, thereby adjusting the tilting elastic force of the chair back connector (2) to the correct position.

2. The seat chassis with stepless adjustable tilt elasticity according to claim 1, characterized in that: The linkage structure includes a linkage inclined surface (71) that extends longitudinally on the sliding seat (7). When the sliding seat (7) slides laterally, the linkage inclined surface (71) forms a longitudinal component force on the lifting seat (6), causing the lifting seat (6) to move and causing the swing component (5) to rotate.

3. The seat chassis with continuously adjustable tilt elasticity according to claim 1, characterized in that: The lower end face of the lifting seat (6) is recessed in a local area and forms a guide groove (61) extending laterally. The sliding seat (7) is slidably connected in the guide groove (61).

4. The seat chassis with continuously adjustable tilt elasticity according to claim 1, characterized in that: The sliding seat (7) includes a sliding body, which has a through hole (72) extending along the axis of the drive screw (8) and a groove (73) located on the extension trajectory of the through hole (72) and communicating with the through hole (72). The groove (73) has an internal thread sleeve (7a) for threaded connection with the drive screw (8).

5. The seat chassis with continuously adjustable tilt elasticity according to claim 1, characterized in that: The swing member (5) is an L-shaped link. The L-shaped link includes a swing arm that is rotatably connected to the base (1) and an extension arm (51) that is integrally connected to the swing arm. The lifting seat (6) acts on the extension arm (51) to cause the swing member (5) to rotate.

6. The seat chassis with continuously adjustable tilt elasticity according to claim 1, characterized in that: The base (1) includes a base plate and side plates on the left and right sides of the base plate. Each side plate is provided with a through hole corresponding to the position of the sliding seat (7). The drive screw (8) includes a smooth section and a threaded section (81) connected to each other. The threaded section (81) is threadedly connected to the sliding seat (7). The smooth section passes through the through hole. The smooth section is provided with two axially spaced limiting protrusions (82). The two limiting protrusions (82) abut against the inner and outer sides of the side plate with the through hole, respectively, to restrict the drive screw (8) from moving along its own axis.

7. The seat chassis with stepless adjustable tilt elasticity according to claim 1, characterized in that: The chair back connector (2) has a mounting part (3) and the elastic element is a tension spring (4) that is hooked between the swinging part (5) and the mounting part (3).

8. The seat chassis with continuously adjustable tilt elasticity according to claim 1, characterized in that: The linkage structure includes a guide pin (74) set on the sliding seat (7) and an inclined guide groove (75) set on the lifting seat (6) and extending longitudinally. The guide pin (74) is slidably connected in the inclined guide groove (75). When the sliding seat (7) slides laterally, the guide pin (74) slides in the inclined guide groove (75) and forms a longitudinal component force on the lifting seat (6), causing the lifting seat (6) to move and causing the swing member (5) to rotate.

9. A seat chassis with stepless adjustable tilt elasticity, characterized in that, The device includes a base (1) and a backrest connector (2) hinged to the base (1). The backrest connector (2) can rotate back and forth relative to the base (1). A swing member (5) is hinged to the base (1) and located in front of the backrest connector (2). An elastic member is provided between the swing member (5) and the backrest connector (2). A stepless adjustment assembly is provided on the base (1). The stepless adjustment assembly includes a sliding seat (7) acting on the swing member (5). A drive screw (8) threadedly connected to the sliding seat (7) and passing through the base (1) laterally is provided. The drive screw (8) can rotate in place and drive the sliding seat (7) to slide laterally. A linkage inclined surface (71) extending longitudinally is provided on one of the sliding seat (7) and the swing member (5). The other sliding seat (7) and the other swing member (5) are in contact with the linkage inclined surface (71). When the drive screw (8) rotates in place, it can drive the sliding seat (7) to slide. At the same time, the swinging part (5) rotates and maintains a predetermined position through the action of the linkage inclined plane (71) to change the degree of deformation of the elastic part, thereby adjusting the tilting elastic force of the backrest connector (2) to the correct position.

10. A seat chassis with stepless adjustable tilt elasticity, characterized in that, The device includes a base (1) and a backrest connector (2) hinged to the base (1). The backrest connector (2) can rotate back and forth relative to the base (1). A swing member (5) is hinged to the base (1) and located in front of the backrest connector (2). An elastic member is provided between the swing member (5) and the backrest connector (2). A stepless adjustment assembly is provided on the base (1). The stepless adjustment assembly includes a lifting seat (6) that is slidably connected to the base (1) in the longitudinal direction and acts on the swing member (5). A drive screw (8) that passes through the base (1) in the longitudinal direction is threaded onto the lifting seat (6). The drive screw (8) can rotate in place and drive the lifting seat (6) to slide longitudinally. When the drive screw (8) rotates in place, it can drive the lifting seat (6) to rise and fall, and at the same time, the swinging part (5) rotates and maintains the predetermined position to change the degree of deformation of the elastic part, thereby adjusting the tilting elastic force of the backrest connector (2) to the correct position.

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