Regulator for tipping buffering elastic piece and chassis using regulator

Abstract

The utility model discloses a regulator for a tipping buffer elastic piece and a chassis using the regulator, the regulator comprises an abutting shaft for the tipping buffer elastic piece to abut, the chassis comprises a base, a base connecting piece, a back connecting piece, the tipping buffer elastic piece and the regulator, and the abutting shaft is rotatably arranged on the back connecting piece; the abutting shaft is provided with at least two gear grooves with different depths or heights, and the gear grooves are sunken in the radial direction and arranged in the circumferential direction so that the elastic pieces can be switched in the grooves. The abutting shaft is integrally formed or fixedly connected with an adjusting block, and the adjusting block is also provided with gear grooves of different heights. When the adjuster is rotated, the tipping buffering elastic piece is switched between the gear grooves, the initial elastic force is changed, and people with different weights can be adapted; compared with stepless adjustment, the scheme is high in adjusting speed, elastic force can be switched by rotating a certain angle, the elastic force is obviously changed by gears, and operation is convenient and fast; and the gear grooves can be prevented from being disengaged, stability is high, abrasion is small, the service life is long, and the requirement for rapid adjustment of the seat is met.

Description

Technical Field

[0001] This utility model relates to the field of furniture, and in particular to an adjuster for a tilting buffer elastic element and a chassis using the adjuster. Background Technology

[0002] In the seating manufacturing industry, the tilt function of the seat chassis is a key technology for improving user comfort, and the tilt buffer elastic component, as the core component to achieve this function, directly affects the user experience of the seat; however, existing seat chassis have certain problems in this part to varying degrees.

[0003] Most traditional chair chassis use fixed-elasticity tilting and cushioning elements, which cannot be flexibly adjusted according to different users' weight, sitting habits, and usage scenarios. When lighter users use springs with excessive elasticity, the backrest tilting resistance is too high, making it difficult to tilt back smoothly. On the other hand, when heavier users use springs with insufficient elasticity, they cannot obtain enough cushioning support, resulting in an overly abrupt tilting process, which may even pose a safety hazard. In addition, springs with a single elasticity cannot meet the differentiated needs of users for backrest tilting force in different scenarios such as working and resting.

[0004] Some seat chassis with elasticity adjustment function often achieve stepless adjustment. For example, the chassis rocker is connected to a compression spring. When the rocker rotates, the compression spring is compressed. The initial length of the compression spring is adjusted by an external knob, usually a shell-shaped knob, thereby adjusting the elasticity of the compression spring. There are other similar stepless adjustment methods, such as two inclined blocks working together to change the lifting height of one of the torsion arms of the torsion spring through the movement of the inclined plane. This kind of stepless adjustment is very slow, and users often need to adjust for a long time to achieve the desired elasticity.

[0005] Therefore, a regulator for a tilt buffer elastic element and a chassis using the regulator are developed to solve the above problems. Summary of the Invention

[0006] To address the aforementioned technical problems, this utility model provides an adjuster for a tilt-and-buffer elastic element, comprising an abutment shaft for the tilt-and-buffer elastic element to abut against, the shaft having at least two slots of different depths or heights, radially recessed and circumferentially arranged, allowing the elastic element to switch between slots; an adjusting block is either integrally formed or fixedly connected to the abutment shaft, the adjusting block also having slots of different heights; rotating the adjuster causes the tilt-and-buffer elastic element to switch between slots, changing the initial elastic force to suit people of different weights; compared to stepless adjustment, this solution offers faster adjustment speed, allowing for elastic force switching with a certain rotation angle, and the gear position significantly alters the elastic force, making operation convenient; furthermore, the slots are designed to prevent disengagement, providing strong stability, minimal wear, and a long service life, meeting the needs for rapid seat adjustment.

[0007] Furthermore, a chassis using the adjuster is provided, including a base, a base connector, a back connector, a tilt buffer elastic element, and the aforementioned adjuster. An abutment shaft is rotatably mounted on the back connector. When the abutment shaft rotates, the gear slots rotate accordingly, causing the tilt buffer elastic element to switch between different gear slots.

[0008] The technical solution of this utility model is implemented as follows:

[0009] An adjuster for a tilt buffer elastic element includes an abutment shaft for the tilt buffer elastic element in the chassis to abut against. The abutment shaft has at least two positioning grooves, each groove being radially recessed along the abutment shaft and having a different depth. The different positioning grooves are arranged circumferentially along the abutment shaft. The positioning grooves are configured such that the tilt buffer elastic element abuts against the positioning grooves, and the tilt buffer elastic element switches between different positioning grooves when the abutment shaft rotates.

[0010] An adjuster for a tilt buffer elastic element includes an abutment shaft for the tilt buffer elastic element in the chassis to abut against. An adjusting block is integrally formed or fixedly connected to the abutment shaft. The adjusting block protrudes radially from the abutment shaft and has at least two positioning grooves of different heights. The positioning grooves are all recessed radially along the abutment shaft. The different positioning grooves are arranged circumferentially along the adjusting block. The positioning grooves are configured such that the tilt buffer elastic element abuts against the positioning grooves, and the tilt buffer elastic element switches between different positioning grooves when the adjusting block rotates.

[0011] When the adjuster is rotated, the tilt cushion elastic element switches between different slots, thus changing the initial elastic force of the tilt cushion elastic element. A larger initial elastic force is suitable for heavier people, and a smaller initial elastic force is suitable for lighter people, thus accommodating a wider range of body weights. Compared to stepless adjustment, the advantage of this solution in adjusting the elastic force through different slots is that the adjustment operation is faster. The adjustment of different elastic forces can be completed by rotating the adjuster a certain angle. Different slots have a greater impact on the elastic force of the tilt cushion elastic element, allowing users to quickly adjust to the desired elastic force. Compared to other adjustments on the seat, it does not need to be too precise, but it needs to be faster and more convenient to adjust and switch from accommodating heavier people to accommodating lighter people. Moreover, the slots can effectively prevent disengagement, maintain stability, and unlike stepless adjustment structures, they do not experience wear and tear, resulting in a longer service life.

[0012] Preferably, the adjusting block includes a connecting part and an actuating part. The connecting part is sleeve-shaped and sleeved on the abutting shaft. The actuating part protrudes radially from the connecting part, and the gear slot is provided on the actuating part.

[0013] Preferably, the actuating part is provided with five adjustable grooves along the circumferential direction, with the height of the five grooves increasing sequentially. This provides five selectable levels for adjusting the elasticity, corresponding to five weight ranges of people, thus adapting to a wider range of needs.

[0014] Preferably, a blocking part is provided at both the front and rear ends of the actuating part, with the two blocking parts located beside the first and last gear slots, respectively. The blocking parts protrude to prevent the tilt buffer elastic element from leaving the gear slot.

[0015] Preferably, each pair of adjacent shift slots has a raised span. The span effectively holds the tilt buffer elastic element within the shift slot.

[0016] A chassis includes a base, a seat connector, a back connector, a tilt buffer elastic element, and the aforementioned adjuster. The base is configured as a main support and a support base for connecting a seat. The seat connector is disposed on the base and configured to connect to the seat. The back connector is rotatably disposed on the base and configured to connect to the backrest. The back connector is rotatably connected to the base via a rotating shaft, on which the tilt buffer elastic element is disposed. An abutment shaft is disposed on the back connector. One end of the tilt buffer elastic element abuts against the base or the seat connector, and the other end abuts against the shift groove. The abutment shaft is rotatably disposed on the back connector. When the abutment shaft rotates, the shift groove rotates accordingly, causing the tilt buffer elastic element to switch between different shift grooves.

[0017] Preferably, the tilt buffer elastic element is a torsion spring, with a first arm and a second arm extending from the torsion spring. The first arm abuts against the stop groove, and the second arm abuts against the base or seat connector. There is an angle between the first arm and the second arm, and the change of this angle reflects the magnitude of the torsion spring's elastic force.

[0018] Preferably, there are two torsion springs arranged symmetrically on the left and right. A spring seat is fixedly provided at the rear end of the base, and the spring seat has two receiving grooves. The second arm is disposed in the receiving groove and abuts against the spring seat. The spring seat keeps the second arm stationary. When the first arm is lifted by the abutment shaft, the elastic force of the torsion spring increases.

[0019] Preferably, the end of the first arm is bent to form an abutment portion arranged in the left-right direction, and the abutment portion is disposed in the gear slot. This ensures that the first arm can remain in the gear slot without disengaging, thus ensuring operational stability.

[0020] The design starting point, concept, and beneficial effects of this utility model, which adopts the above technical solution, are as follows:

[0021] When the adjuster is rotated, the tilt cushion elastic element switches between different slots, thus changing the initial elastic force of the tilt cushion elastic element. A larger initial elastic force is suitable for heavier people, and a smaller initial elastic force is suitable for lighter people, thus accommodating a wider range of body weights. Compared to stepless adjustment, the advantage of this solution in adjusting the elastic force through different slots is that the adjustment operation is faster. The adjustment of different elastic forces can be completed by rotating the adjuster a certain angle. Different slots have a greater impact on the elastic force of the tilt cushion elastic element, allowing users to quickly adjust to the desired elastic force. Compared to other adjustments on the seat, it does not need to be too precise, but it needs to be faster and more convenient to adjust and switch from accommodating heavier people to accommodating lighter people. Moreover, the slots can effectively prevent disengagement, maintain stability, and unlike stepless adjustment structures, they do not experience wear and tear, resulting in a longer service life. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the three-dimensional structure of the chassis in an embodiment of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of the chassis in an embodiment of the present invention. Figure 2 ;

[0024] Figure 3 This is a three-dimensional structural diagram of the driver and regulator in the disengaged state in an embodiment of the present invention;

[0025] Figure 4 This is a three-dimensional structural diagram of the driver and regulator in the engaged state of this utility model in an embodiment;

[0026] Figure 5 This is a cross-sectional view of the chassis in an embodiment of the present invention;

[0027] Figure 6 This is a three-dimensional structural diagram of the regulator in an embodiment of the present invention;

[0028] Figure 7 This is a three-dimensional structural diagram of the adjusting block in an embodiment of the present invention;

[0029] Figure 8 The explosion of the driver in the embodiment of this utility model Figure 1 ;

[0030] Figure 9 The explosion of the driver in the embodiment of this utility model Figure 2 ;

[0031] Figure 10 This is a cross-sectional view of the driver in an embodiment of the present invention;

[0032] Figure 11 This is a side view of the adjusting block in an embodiment of the present invention.

[0033] The reference numerals in the attached drawings are as follows: base 1; spring seat 11; receiving groove 111; entry hole 12; seat connector 2; back connector 3; abutment shaft 4; joint 41; adjusting block 5; connecting part 51; actuating part 52; crossing part 521; blocking part 522; gear slot 6; torsion spring 7; first support arm 71; abutment part 711; second support arm 72; rotating shaft 8; driver 10; housing 12; receiving groove 121; cover plate 122; transmission assembly 13; input end 131; output end 132; input end 133; input end 134; input end 135 ... Output end 132; Input plate 133; First sun gear 134; First planet gear 135; First planet carrier 136; Second sun gear 137; Second planet gear 138; Second planet carrier 139; Third sun gear 1310; Third planet gear 1311; Third planet carrier 1312; Input component 14; Mounting slot 141; Internal hexagonal hole 142; Output component 15; Engaging end 151; Linkage end 152; Internal spline 153; Annular groove 154; Transmission sleeve 16. Detailed Implementation

[0034] 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.

[0035] 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.

[0036] In the description of this utility model, the terms "first," "second," "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0037] The specific implementation of this utility model is as follows:

[0038] like Figure 8-11 As shown, this utility model provides an adjuster for adjusting a tilt buffer elastic element, which is applied in a chassis and the tilt buffer elastic element is adjusted by a method.

[0039] Specifically, a method for adjusting the tilt buffer elastic element in a chassis:

[0040] When the torsion spring 7 is not under load, the opening angle between its first arm 71 and second arm 72 is the natural opening angle. When the torsion spring 7 is installed on the chassis, it receives preload. In this state, the opening angle between the first arm 71 and second arm 72 is the initial opening angle. The first arm 71 moves synchronously with the back connector 3, while the second arm 72 remains stationary or moves in the opposite direction to the first arm 71. The difference between the initial opening angle and the natural opening angle determines the initial spring force of the torsion spring 7.

[0041] Make the first arm 71 abut against the adjusting block 5 with different gear slots 6, and make the first arm 71 in the gear slot 6. Different gear slots 6 have different depths. Rotate the adjusting block 5 to make the first arm 71 switch between different gear slots 6. The adjusting block 5 presses down or raises the first arm 71 to different heights to change the initial opening and closing angle and the magnitude of the initial elastic force.

[0042] When the adjusting block 5 is rotated, the first arm 71 switches between different gear slots 6. The first arm 71 is pressed down or raised to different heights by the adjusting block 5, while the second arm 72 remains stationary or moves in the opposite direction to the first arm 71. This changes the relative position of the first arm 71 and the second arm 72, thereby changing the initial opening angle and thus the initial elastic force. At different initial opening angles, when the chair back is fully reclined, the angle at which the backrest connector 3 rotates backward and downward is always the same, that is, the stroke is always the same. Due to the change in the initial opening angle and initial elastic force, the elastic force provided by the torsion spring 7 is also different during the reclining process. That is, the larger the initial opening angle and initial elastic force, the greater the subsequent elastic force, which is suitable for heavier people, and vice versa.

[0043] Compared to stepless adjustment, the advantage of this solution in adjusting the spring force through different gear slots 6 is that the adjustment operation is faster. The adjustment block 5 can be rotated at a certain angle to complete the adjustment of different spring forces. Moreover, when the first support arm 71 is in different gears, the spring force of the torsion spring 7 changes more, allowing the user to quickly adjust to the desired spring force. Compared to other adjustments on the seat, it does not need to be too delicate, but it needs to be adjusted more quickly and conveniently to achieve the switching from adapting to heavier people to adapting to lighter people. In addition, after the first support arm 71 enters the gear slot 6, it can effectively prevent it from disengaging and maintain its stability. Unlike the stepless adjustment structure, it does not experience wear and tear, resulting in a longer service life.

[0044] Using the gear adjustment is equivalent to dividing people of multiple weight ranges into multiple gear slots. For example, people over 100kg can use the highest gear, people under 40kg can use the lowest gear, and people of 40-60kg, 60-80kg, and 80-100kg can use the middle gears respectively. Compared with fine stepless adjustment, it is more reasonable and more suitable for adjusting the elasticity of the tilt buffer elastic element.

[0045] The rotation of the adjusting block 5 is driven by the driver 10. The adjusting block 5 is mounted on the back connector 3, and the driver 10 is mounted on the base 1 of the chassis. The driver 10 has a disengaged state and an engaged state. The driver 10 has a pull-out and sliding output member 15. When the adjusting block 5 is rotated, the output member 15 is pushed towards the adjusting block 5 and slides until it engages with the adjusting block 5, so that the two are connected by transmission. At this time, the driver 10 is in the engaged state, the back connector 3 and the base 1 remain relatively stationary, and the driver 10 can drive the adjusting block 5 to rotate. When the back connector 3 rotates, the output member 15 is pulled away from the adjusting block 5 and slides away, so that the output member 15 is disengaged from the adjusting block 5. At this time, the driver 10 is in the disengaged state, and the back connector 3 can rotate relative to the base 1. The rotation of the adjusting block 5 needs to be driven by the driver 10. When the adjusting block 5 rotates, the driver 10 needs to be connected to the adjusting block 5. When the back connector 3 rotates, the driver 10 needs to be disengaged from the adjusting block 5. Therefore, the output part 15 of the driver 10 is movable and has a disengaged state and an engaged state, so as to achieve disengagement and engagement. It can rotate the adjusting block 5 and allow the back connector 3 to rotate without obstruction.

[0046] The above method is used in a chassis, such as Figure 1-5 As shown, the chassis includes a base 1, a seat connector 2, and a back connector 3. The base 1 serves as the main support and a support base for connecting the seat. The seat connector 2 is mounted on the base 1 and is configured to connect the seat. The back connector 3 is rotatably mounted on the base 1 and is configured to connect the backrest. The support base generally includes a lifting gas spring and a five-star base. The two ends of the lifting gas spring are connected to the base 1 and the five-star base, respectively. The chassis also includes a tilting buffer elastic element that provides rotational cushioning for the back connector 3. In this embodiment, the tilting buffer elastic element is a torsion spring 7. The back connector 3 is rotatably connected to the base 1 via a pivot 8. On the base 1, a torsion spring 7 is provided on the rotating shaft 8 to provide rotational torque. When the chair back is folded down and the backrest connector 3 rotates backward and downward, the torsion spring 7 provides torque and cushioning. The backrest connector 3 is provided with an abutment shaft 4. A first arm 71 and a second arm 72 extend from the torsion spring 7. The first arm 71 abuts against the abutment shaft 4, and the second arm 72 abuts against the base 1 or the seat connector 2. When the backrest connector 3 rotates backward and downward, the abutment shaft 4 drives the first arm 71 to move relative to the second arm 72. The torsion spring 7 deforms and provides reverse torque when the backrest connector 3 rotates backward and downward.

[0047] In some chassis, the seat connector 2 is fixed to the base 1, and the second arm 72 of the torsion spring 7 can abut against either the seat connector 2 or the base 1. In some chassis, the seat connector 2 moves relative to the base 1 as the back connector 3 rotates, and this movement increases the distance between the back connector 3 and the seat connector 2. For example, if the rotation of the back connector 3 can lift the chassis of the seat connector 2, then the second arm 72 of the torsion spring 7 can only abut against the base 1 to achieve the effect of providing torque. In this embodiment, the second arm 72 abuts against the base 1. Specifically, there are two torsion springs 7 arranged symmetrically on the left and right. The rear end of the base 1 is fixedly provided with a spring seat 11, and the spring seat 11 is provided with two receiving grooves 111. The second arm 72 is disposed in the receiving grooves 111 and abuts against the spring seat 11.

[0048] The abutment shaft 4 is located on the front side of the rotating shaft 8. When the back connector 3 rotates backward and downward, the abutment shaft 4 moves upward and lifts the first support arm 71, thus tightening the torsion spring 7. Two adjusting blocks 5 are provided on the abutment shaft 4 corresponding to the two torsion springs 7. The adjusting blocks 5 adjust the distance between the first support arm 71 and the abutment shaft 4, which is the initial preload of the torsion spring 7. When the distance between the first support arm 71 and the abutment shaft 4 changes, the initial preload of the torsion spring 7 also changes. In this embodiment, the first support arm 71 is located above the adjusting block 5, and the first support arm 71 abuts against the adjusting block 5 from top to bottom. At this time, the adjusting block 5 is used to adjust the initial height of the abutment between the first support arm 71 and the abutment shaft 4. Simply put, it adjusts the initial height of the first support arm 71, thereby adjusting the initial preload of the torsion spring 7.

[0049] like Figure 6 , 7 As shown, the adjusting block 5 protrudes radially from the abutment shaft 4, and the first arm 71 of the torsion spring 7 is mounted on the adjusting block 5. The adjusting block 5 has at least two gear slots 6, which are arranged at intervals along the circumference of the abutment shaft 4. All gear slots 6 are recessed radially towards the abutment shaft 4, and the lowest point of each gear slot 6 is at a different distance from the abutment shaft 4, meaning the height of each gear is different. When the first arm 71 is located in different gear slots 6, the height to which the first arm 71 is raised varies. Since the second arm 72 is constrained to a constant height, the higher the first arm 71 is, the greater the degree of tension of the torsion spring 7, and the greater the initial elastic force of the torsion spring 7. The gear slots 6 can be directly mounted on the abutment shaft 4. If the abutment shaft 4 is thick enough, the depth difference between the gear slots 6 can be made apparent.

[0050] The adjusting block 5 can be integrally formed with the abutment shaft 4 or fixedly connected. The abutment shaft 4 is rotatably mounted on the back connector 3. When the abutment shaft 4 rotates, the adjusting block 5 rotates together, so that the first support arm 71 enters different gear slots 6. The end of the first support arm 71 is bent to form an abutment part 711 arranged in the left-right direction, and the abutment part 711 is disposed in the gear slot 6. In this embodiment, the adjusting block 5 and the abutment shaft 4 are fixedly connected by screws. The adjusting block 5 includes a connecting part 51 and an actuating part 52. The connecting part 51 is sleeve-shaped and is sleeved on the abutment shaft 4 and fixedly connected to it. The working part 52 protrudes radially from the connecting part 51, and the gear slot 6 is provided on the working part 52; along the circumferential direction, the working part 52 is provided with five gear slots 6, the height of the five gear slots 6 increases sequentially, the gear slots 6 are recessed on the adjusting block 5, and there is a protruding spanning part 521 between adjacent gear slots 6; there are blocking parts 522 at both the front and rear ends of the working part 52, the two blocking parts 522 are located on the side of the first gear slot 6 and the last gear slot 6 respectively, and the blocking parts 522 protrude to prevent the abutting part 711 from leaving the gear slot 6.

[0051] Since the abutment part 711 needs to pass through the crossing part 521 to switch to another gear slot 6, it needs to resist the elastic force of the torsion spring 7 when switching. Normally, the elastic force of the torsion spring 7 acts on the total weight of the human body, and the elastic force is very large. It is obviously very difficult for the user to directly control the gear switching by hand. Therefore, a driver 10 is also provided on the base 1. The abutment shaft 4 extends toward the driver 10 with a joint part 41. The joint part 41 protrudes from the back connector 3, and the driver 10 and the joint part 41 are engaged and disengaged. The driver 10 is configured to increase the force input by the user and output it to the joint part 41, and drive the abutment shaft 4 and the adjusting block 5 to rotate. In this embodiment, the driver 10 is a reducer to achieve the effect of speed reduction and torque increase.

[0052] The driver 10 is as follows:

[0053] like Figure 8-11 As shown, the driver 10 includes a housing 12, a transmission assembly 13, an input component 14, and an output component 15. The housing 12 is fixedly connected to the base 1 and has a receiving groove 121. The transmission assembly 13 is disposed in the receiving groove 121, and a cover plate 122 is provided on the housing 12 to close the receiving groove 121. The transmission assembly 13 has an input end 131 and an output end 132. The input component 14 is directly connected to the input end 131, and the output component 15 is directly connected to the output end 132.

[0054] The output component 15 is inserted into the housing 12 and extends through the housing 12 along its length. The output component 15 is coaxial with the abutment shaft 4. Both ends of the output component 15 protrude from the housing 12. The end of the output component 15 closer to the joint 41 is the joint end 151, and the end of the output component 15 further away from the joint 41 is the linkage end 152. The base 1 has an entry hole 12 corresponding to the joint end 151 to allow the joint end 151 to enter the interior of the base 1. The joint end 151 is provided with an internal spline 153. The joint 41 has an external hexagonal cross section. When the joint end 151 moves toward the joint 41, the internal spline 153 engages with the external hexagonal, and vice versa, thereby realizing the engagement and disengagement with the joint 41. The internal spline 153 can be inserted into the joint 41 at multiple angles without complete alignment, which facilitates engagement.

[0055] The cover plate 122 is annular. The input end 131 extends outward from the center of the cover plate 122 with a transmission sleeve 16. The input component 14 is inserted into the transmission sleeve 16 and is connected to the transmission sleeve 16 in a transmission manner. The input component 14 has a mounting groove 141. The linkage end 152 of the output component 15 is inserted into the mounting groove 141. When the input component 14 slides left and right in the transmission sleeve 16, it can drive the output component 15 to slide left and right, so that the output component 15 moves closer to or away from the joint 41, thereby realizing the engagement and disengagement. Specifically, the linkage end 152 has an annular groove 154. The input component 14 has a radial hole that connects to the mounting groove 141 and the annular groove 154. A limiting component (not shown) is provided in the hole. The limiting component also enters the annular groove 154, so as to realize that the input component 14 and the output component 15 slide synchronously and can rotate relatively independently.

[0056] The transmission assembly 13 includes a sun gear, planet gears, and a planet carrier to form a planetary gear reducer. Specifically, the input end 131 includes an input plate 133, on which a synchronously rotating first sun gear 134 is provided. The first sun gear 134 is externally meshed with three first planet gears 135. The first planet gears 135 are all rotatably mounted on a first planet carrier 136. The first planet carrier 136 is parallel to the input plate 133 and closer to the engagement part 41. On the opposite side of the first planet carrier 136, a second sun gear 137 is provided, on which three second planet gears 138 are externally meshed. All three planetary gears 1311 are rotatably mounted on the second planetary carrier 139. The third sun gear 1310 is located on the reverse side of the second planetary carrier 139. The third sun gear 1310 is externally meshed with three third planetary gears 1311. The third planetary gears 1311 are all rotatably mounted on the third planetary carrier 1312. The third planetary carrier 1312 is the output end 132, which is connected to the output component 15 for transmission. The output component 15 passes through the transmission assembly 13 and has a transmission plane. Only the hole of the third planetary carrier 1312 has a corresponding plane. The receiving groove 121 of the housing 12 has teeth arranged around its circumference for meshing with the planetary gears.

[0057] The input component 14 has an internal hexagonal hole 142 on its end face, which allows the user to drive it with a hexagonal wrench. Of course, the user can also turn the input component 14 directly by hand. If the user still finds it difficult to turn the input component 14 directly by hand, a hexagonal wrench can be used to drive it. When adjusting the initial preload of the torsion spring 7, first push the input component 14 toward the abutment shaft 4. The output component 15 moves accordingly and the engagement end 151 is inserted into the engagement part 41. Then rotate the input component 14 to move the transmission component 13. The output force is transmitted from the output end 132 to the output component 15 after passing through layers of deceleration and torque amplification. The output component 15 drives the abutment shaft 4 and the adjusting block 5 to rotate, so that the abutment part 711 can easily pass over the crossing part 521 to enter other gear slots 6.

[0058] The main components of the chassis are nothing more than the aforementioned base 1, base connector 2, and back connector 3. The adjusting block 5 and the drive unit 10 can be applied to different chassis.

Claims

1. An adjuster for a tilt-damping elastic element, characterized in that: The device includes an abutment shaft for the tilt buffer elastic element in the chassis to abut against. The abutment shaft has at least two positioning grooves, each groove being radially recessed along the abutment shaft and having a different depth. The different positioning grooves are arranged circumferentially along the abutment shaft. The positioning grooves are configured such that the tilt buffer elastic element abuts against the positioning grooves, and the tilt buffer elastic element switches between different positioning grooves when the abutment shaft rotates.

2. An adjuster for a tilt-buffered elastic element, characterized in that: The device includes an abutment shaft for the tilt buffer elastic element in the chassis to abut against. An adjusting block is integrally formed or fixedly connected to the abutment shaft. The adjusting block protrudes radially from the abutment shaft and has at least two gear slots of different heights. The gear slots are all recessed radially along the abutment shaft. The different gear slots are arranged circumferentially along the adjusting block. The gear slots are configured such that the tilt buffer elastic element abuts against the gear slot, and the tilt buffer elastic element switches between different gear slots when the adjusting block rotates.

3. The adjuster for a tilt buffer elastic element according to claim 2, characterized in that: The adjustment block includes a connecting part and an actuating part. The connecting part is sleeve-shaped and sleeved on the abutting shaft. The actuating part protrudes radially from the connecting part, and the gear slot is provided on the actuating part.

4. The adjuster for a tilt buffer elastic element according to claim 3, characterized in that: Along the circumferential direction, the functional part is provided with five gear slots, and the height of the five gear slots increases sequentially.

5. The adjuster for a tilt buffer elastic element according to claim 3, characterized in that: The front and rear ends of the action part are provided with blocking parts, and the two blocking parts are located on the side of the first gear slot and the last gear slot, respectively.

6. The adjuster for a tilt buffer elastic element according to claim 1 or 2, characterized in that: There is a raised span between each two adjacent gear slots.

7. A chassis, characterized in that: The device includes a base, a seat connector, a back connector, a tilt buffer elastic element, and an adjuster as described in any one of claims 1-5. The base is configured as a main support and a support base for connecting a seat. The seat connector is disposed on the base and configured to connect to the seat. The back connector is rotatably disposed on the base and configured to connect to the backrest. The back connector is rotatably connected to the base via a rotating shaft, on which the tilt buffer elastic element is disposed. The abutment shaft is disposed on the back connector. One end of the tilt buffer elastic element abuts against the base or the seat connector, and the other end abuts against the shift groove. The abutment shaft is rotatably disposed on the back connector. When the abutment shaft rotates, the shift groove rotates accordingly, causing the tilt buffer elastic element to switch between different shift grooves.

8. The chassis according to claim 7, characterized in that: The tilting buffer elastic element is a torsion spring, and a first arm and a second arm extend from the torsion spring. The first arm abuts in the gear slot, and the second arm abuts in the base or seat connector.

9. The chassis according to claim 8, characterized in that: There are two torsion springs arranged symmetrically on the left and right. A spring seat is fixed at the rear end of the base. The spring seat has two receiving grooves. The second arm is set in the receiving groove and abuts against the spring seat.

10. The chassis according to claim 8, characterized in that: The end of the first arm is bent to form an abutment portion arranged in the left-right direction, and the abutment portion is set in the gear slot.

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