Chair backrest inclination-adaptive rocking component, chair backrest inclination fixing mechanism and soleplate

Abstract

To provide an adaptive rocking component for tilting a backrest of a chair, a backrest tilt fixing mechanism for the chair, and a bottom board, which are easy to operate, simple in structure, and low in cost.SOLUTION: The adaptive shaking component includes a main shaft 1 and a movable assembly. The movable assembly includes a first movable part 3, a track base 2, and a second movable part which synchronously rotate around a main shaft. In the adjustment state, the first movable part 3 is disengaged from the second movable part, the backrest of the chair can be rotated, and the first movable part 3 is driven to move in the adjustment direction and rotate relative to the main shaft 1. Further, the above-mentioned fixing mechanism is applied to the chassis, and in the fixed state, the first movable part and the second movable part are combined and fixed, the current inclination angle of the chair back is fixed, and the entire movable assembly is driven to rotate relative to the main shaft, so that adaptive swinging can be realized and movement interference can be avoided.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to the field of furniture, and in particular to a chair back tilt adaptive rocking component, a chair back tilt fixing mechanism, and a base. [Background technology]

[0002] The base is an essential and important component of modern office chairs. Bases typically have multiple functions, such as air lift and back tilt adjustment. Different grades of office chairs use bases with different functions and costs. Some manufacturers design and manufacture more expensive bases with more features for high-end office chairs. Others use bases with simpler structures and functions to keep costs down.

[0003] The base of an existing office chair has a simple structure with only the functions of air rod lift and back tilt adjustment, making it ideal for low-cost bases. These low-cost bases are disclosed, for example, in U.S. Patents US07518378 and US10684157.

[0004] This type of base uses a friction plate to press down and fix the chair back tilt. When the friction plate is loosened, the chair back can rotate relative to the base, and when the friction plate is pressed down, the chair back is fixed relative to the base. The friction plate fixing method is simple and low-cost, and the chair back can be fixed at any angle. However, this method is tedious to operate, and a great deal of effort is required to turn the operating lever to release the fixation. Furthermore, after long-term use, the friction plate wears out, which can cause abnormal noise during operation and lead to poor fixation.

[0005] To solve the problem of fixing by friction plates, a structural fixing method can be used instead, but if you want to use a structural fixing mechanism, you need to find a reasonable way to move it, overcome the problem of interference between the movements of the two, and ensure low cost. Summary of the Invention [Problem to be solved by the invention]

[0006] To solve the above technical problems, the present invention provides an adaptive rocking component for tilting the back of a chair, including a main shaft and a movable assembly rotatably disposed on the main shaft and rocking on the main shaft. A first movable section and a second movable section in the movable assembly move along different tracks on a track base, but the first movable section, track base, and second movable section rotate together in synchronization. The first movable section slides within a first sliding track of the track base, driving the track base to rotate relative to the main shaft. Accordingly, the second movable section also rotates in synchronization. The entire movable assembly rotates relative to the main shaft, achieving adaptive rocking, thereby preventing interference and jamming.

[0007] Furthermore, a chair back tilt locking mechanism is provided, which includes the adaptive rocking component described above, has an adjustment direction and a locking direction, and also has an adjustment state and a locking state. In the adjustment state, the first movable part is separated from the second movable part, allowing the chair back to rotate and drive the first movable part to move in the adjustment direction and rotate about the main axis. In the locking state, the first movable part and the second movable part are coupled and fixed, fixing the current tilt angle of the chair back. The structural locking of this mechanism replaces the locking by a friction plate used in the prior art, solving problems such as wear-related breakdowns and abnormal noise, while also offering good operability, a simple structure, and low costs.

[0008] Furthermore, a base using the above-mentioned chair back tilt fixing mechanism is provided. The base includes a base, a chair back connection part, and the above-mentioned chair back tilt fixing mechanism, where the base functions as a main support, and both the chair back connection part and the chair back tilt fixing mechanism are installed on the base, the chair back connection part connects to the chair back, and the chair back tilt fixing mechanism and the chair back connection part are connected via a link mechanism. When the chair back is tilted downward by the action of the human body, the chair back connection part can drive and interlock the chair back tilt fixing mechanism.

[0009] The technical solution of the present invention is realized as follows: An adaptive rocking component for tilting a chair back includes a main shaft and a movable assembly rotatably disposed on the main shaft and rocking on the main shaft, the movable assembly including a track base and a first movable portion and a second movable portion disposed on the track base, the track base including a first sliding track and a second sliding track that are perpendicular to each other, the first movable portion and the second movable portion sliding within the first sliding track and the second sliding track, respectively. When the first movable portion contacts the first sliding track, the first movable portion can rotate synchronously with the track base relative to the main shaft. When the second movable portion contacts the second sliding track, the second movable portion can rotate synchronously with the track base relative to the main shaft. The first movable portion or the second movable portion is sleeve-mounted on the main shaft and rotatably connected to the main shaft.

[0010] Furthermore, there is provided a chair back tilt locking mechanism including the adaptive rocking component described above. The chair back tilt locking mechanism has an adjustment direction and a locking direction, where the adjustment direction coincides with the first sliding track and the locking direction overlaps with the second sliding track, and the first movable part moves in the adjustment direction as the chair back rotates, and the second movable part moves in the locking direction. When the second movable part approaches the first movable part, the first movable part is locked, and when the second movable part moves away from the first movable part, the first movable part is unlocked. The chair back tilt locking mechanism also has an adjustment state and a locking state, where in the adjustment state, the first movable part is separated from the second movable part, and the chair back is rotatable, so that the first movable part can be driven to move in the adjustment direction and rotate about the main axis. In the locking state, the first movable part and the second movable part are coupled and locked, and the current tilt angle of the chair back is fixed.

[0011] The structural fixation of this mechanism replaces the fixation by friction plates used in the prior art, and solves problems such as breakdowns and abnormal noise due to wear. In addition, it is easy to operate, has a simple structure, and is inexpensive.

[0012] Further, a base plate is provided that includes the above-mentioned base, chair back connection portion, and chair back tilt locking mechanism, wherein the chair back tilt locking mechanism is rotatably mounted on the base, with a main axis disposed on the base along the left-right direction. A link mechanism is provided between the chair back tilt locking mechanism and the chair back connection portion, and the link mechanism is configured such that when the chair back connection portion rotates relative to the base, the above-mentioned movable assembly rotates about the main axis. When the chair back tilt locking mechanism is in an adjusted state, the chair back connection portion can rotate relative to the base. When the chair back tilt locking mechanism is in a locked state, the chair back tilt locking mechanism fixes the connection between the chair back connection portion and the base, preventing rotation and holding the chair back connection portion in a rotated position.

[0013] The chair back tilt and locking mechanism is used within the base to achieve the chair back tilt effect. The base functions as the main support, and both the chair back linkage and the chair back tilt and locking mechanism are installed on the base. The chair back linkage connects to the chair back, and a link mechanism connects between the chair back tilt and locking mechanism and the chair back linkage. When the chair back tilts downward due to the action of the human body, the chair back linkage can drive the chair back tilt and locking mechanism to move in conjunction. The first movable part slides and rotates with the movement of the chair back linkage, changing the relative position between the first movable part and the second movable part. When the second movable part and the first movable part are locked together via the internal and external teeth, the chair back and the chair back connection part can be fixed at the current tilt angle, and the movable assembly can swing adaptively around the main axis to prevent interference when the chair back is tilted. [Effects of the Invention]

[0014] The design starting point, concept and beneficial effects of the present invention adopting the above technical solutions are as follows: The movable assembly is arranged on the main shaft so that it can rotate integrally, and the first movable part and the second movable part are arranged to rotate synchronously with respect to the main shaft in cooperation with the track base. Therefore, when either the first movable part or the second movable part not only slides but also rotates with respect to the main shaft, the track base is rotated synchronously, and at the same time, the other of the first movable part or the second movable part is driven to rotate synchronously, so that the entire movable assembly rotates in conjunction with the main shaft, thereby realizing adaptive oscillation and preventing interference or jamming of operations. The structural fixation of the mechanism described above replaces the fixation by friction plates used in the prior art, and solves problems such as breakdowns and abnormal noise caused by wear, while also providing good operability, a simple structure, and low costs. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram 1 showing the three-dimensional structure of the base plate in Example 1 of the present invention. [Figure 2]2 is a schematic diagram 2 showing the three-dimensional structure of the base plate in Example 1 of the present invention. [Figure 3] 1 is a schematic three-dimensional structural diagram of an oscillating component according to a first embodiment of the present invention. [Figure 4] FIG. 2 is a cross-sectional view of the oscillating component according to the first embodiment of the present invention. [Figure 5] 1 is a schematic three-dimensional structural diagram of a swaying component in a fixed state according to a first embodiment of the present invention. [Figure 6] 1 is a schematic three-dimensional structural diagram of an oscillating component in an adjusted state according to a first embodiment of the present invention. [Figure 7] FIG. 2 is a side view of the fixing mechanism before tilting the backrest connecting portion of the chair in the first embodiment of the present invention. [Figure 8] FIG. 2 is a side view of the fixing mechanism after the backrest connecting portion of the chair in the first embodiment of the present invention has been tilted. [Figure 9] FIG. 2 is a schematic three-dimensional structural diagram of a track rail according to the first embodiment of the present invention. [Figure 10] 1 is a schematic three-dimensional structural view of a rail portion in Example 1 of the present invention. [Figure 11] FIG. 2 is a cross-sectional view of the track rail according to the first embodiment of the present invention. [Figure 12] 3 is a schematic three-dimensional structural view of a second movable portion in the first embodiment of the present invention. FIG. [Figure 13] 2 is a schematic three-dimensional structural view of a first movable part in the first embodiment of the present invention. FIG. [Figure 14] FIG. 2 is an exploded view of the swing component according to the first embodiment of the present invention. [Figure 15] 1 is a schematic diagram 1 showing the three-dimensional structure of the base plate in Example 3 of the present invention. [Figure 16] 2 is a schematic diagram 2 showing the three-dimensional structure of the base plate in Example 3 of the present invention. [Figure 17] FIG. 10 is a schematic diagram showing the internal structure of the base plate in Example 3 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to more clearly understand the above objects, features and advantages of the present invention, the present invention will be described in more detail below with reference to the accompanying drawings and specific embodiments, and it should be noted that the embodiments and features of the embodiments of the present application can be combined unless inconsistent.

[0017] In order to fully understand the present invention, many specific details are set forth in the following description, but the scope of protection of the present invention is not limited by the specific details disclosed below, since the present invention can be practiced in ways different from those described herein.

[0018] In describing the present invention, terms such as "first," "second," and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance. Specific embodiments of the present invention are as follows:

[0019] Example 1 As shown in FIGS. 3 to 8 and 14, the present invention provides an adaptive swinging component for tilting a chair back, including a main shaft 1 and a movable assembly. The movable assembly is mounted on the main shaft 1 and can swing on the main shaft 1. The movable assembly includes a track 2 and a first movable section 3 and a second movable section 4 disposed on the track 2. The track 2 includes a first sliding track 5 and a second sliding track 6 that are perpendicular to each other. The first movable section 3 and the second movable section 4 slide within the first sliding track 5 and the second sliding track 6, respectively. The first movable section 3 contacts the first sliding track 5, allowing the first movable section 3 to rotate synchronously with the track 2 relative to the main shaft 1. The second movable section 4 contacts the second sliding track 6, allowing the second movable section 4 to rotate synchronously with the track 2 relative to the main shaft 1. The first movable part 3 or the second movable part 4 is fitted to the main shaft 1 and is rotatably connected to the main shaft 1 .

[0020] The movable assembly rotates as a unit and is positioned on the main shaft 1, and both the first movable part 3 and the second movable part 4 cooperate with the track base 2 to rotate synchronously with respect to the main shaft 1. Therefore, when either the first movable part 3 or the second movable part 4 not only slides but also rotates with respect to the main shaft 1, the track base 2 is rotated synchronously, and at the same time, the other of the first movable part 3 or the second movable part 4 is rotated synchronously, so that the entire movable assembly rotates in conjunction with the main shaft 1, achieving adaptive oscillation and preventing interference or jamming of operations.

[0021] As shown in FIGS. 1 and 2, the chair back tilt adaptive rocking component described above is applied to a chair back tilt fixing mechanism, which is used as a base. The base includes a base 7 as a main support, a chair back tilt fixing mechanism, and a chair back linkage 8 connected to a first movable unit 3. A main shaft 1 is disposed on the base 7 along the left-right direction. The chair back linkage 8 is rotatably connected to the rear end of the base 7. A link mechanism is provided between the chair back tilt fixing mechanism and the chair back linkage 8. The link mechanism is configured so that when the chair back linkage 8 rotates relative to the base 7, the motion assembly rotates around the main shaft 1. In this embodiment, the link mechanism is a linkage pin 9. The front end of the chair back linkage 8 and the rear end of the first movable unit 3 are rotatably connected via the linkage pin 9. The connecting pin 9 is inserted into the rear end of the first movable part 3 and the front end of the chair back connection part 8. The chair back connection part 8 is configured to connect with the chair back. When the chair back tilt locking mechanism is in the adjusted state, the chair back connection part can rotate relative to the base. When the chair back tilt locking mechanism is in the locked state, the chair back tilt locking mechanism fixes the connection between the chair back connection part and the base, preventing rotation and holding the chair back connection part in a rotated position.

[0022] As shown in Figures 5 to 8, the chair back tilt and locking mechanism has an adjustment direction and a locking direction. The adjustment direction coincides with the first sliding track 5, and the locking direction coincides with the second sliding track 6. The first movable part 3 moves in the adjustment direction as the chair back rotates, and the second movable part 4 moves in the locking direction. When the second movable part 4 approaches the first movable part 3, the first movable part 3 is locked, and when the second movable part 4 moves away from the first movable part 3, the first movable part 3 is unlocked. The mechanism also has an adjustment state and a locking state. In the adjustment state, the first movable part 3 and the second movable part 4 are separated, and the chair back moves in the adjustment direction by rotating the first movable part 3, allowing it to rotate around the main shaft 1. In the locking state, the first movable part 3 and the second movable part 4 are coupled and locked, and the current tilt angle of the chair back is fixed.

[0023] The structural fixation of this mechanism replaces the fixation by friction plates used in the prior art, and solves problems such as breakdowns and abnormal noise due to wear. In addition, it is easy to operate, has a simple structure, and is inexpensive.

[0024] Specifically, as shown in FIGS. 1, 2, 9, and 10, the base 7 has an upward opening to form a mounting groove 10 for accommodating the movable assembly. The spindle 1 is laterally mounted on the base 7 and then positioned in the mounting groove 10. The track rail 2, the first movable section 3, and the second movable section 4 are all located within the mounting groove 10. The track rail 2 is composed of two symmetrical rail sections 20 joined together. The rail section 20 includes a main section 201 and a clamping section 202. The clamping section 202 protrudes vertically from the main section 201. When positioned in the mounting groove 10, the main section 201 is closer to the base 7 than the clamping section 202, which is closer to the center of the base 7. When the two rail sections 20 join together, the two clamping sections 202 approach each other and come into contact. The clamping portion 202 is recessed toward the opposite surface to form a first groove 203. The first groove 203 extends in the front-to-rear direction, and after the two rail portions 20 merge, the two first grooves 203 jointly form the first sliding track 5. Therefore, the track base 2 has a groove penetrating from front to back, forming the first sliding track 5.

[0025] As shown in Figures 10 to 12 and 14, the main body 201 is provided with a second groove 204 and a third groove 205 along the left-right direction, with the third groove 205 being closer to the clamping portion 202 than the second groove 204. The second sliding track 6 described above is the second groove 204. The second movable portion 4 includes a locking portion 41 and a sliding portion 42. The sliding portion 42 is disposed within the second groove 204. The second groove 204 is shaped so that the sliding portion 42 fits into the second groove 204, i.e., so that the end of the sliding portion 42 fits into the second sliding track 6. The locking portion 41 is disposed within the third groove 205, and the shape of the third groove 205 matches the locking portion 41, allowing the locking portion 41 to fully enter the third groove 205. The locking portion 41 is used to secure the first movable portion 3 to the first movable portion 3 when approaching the first movable portion 3. The locking part 41 and the sliding part 42 are joined together and connected via the elastic buckle 11 and the clamping hole 12. The locking part 41 is a metal plate with the clamping hole 12, and the sliding part 42 is an injection-molded plastic part, with the elastic buckle 11 formed on the sliding part 42. The locking part 41 is the main force-bearing part, while the sliding part 42 plays a major role in guiding and cooperating with the track base 2. Therefore, the locking part 41 can be made of metal, which reduces costs. At the same time, assembly of the locking part 41 and the sliding part 42 is relatively simple, facilitating production and preventing a decrease in production efficiency. The main shaft 1 and the first movable part 3 are also major stress-bearing parts and are therefore also metal parts. The force applied to the chair back is transmitted to the main shaft 1 via the first movable part 3 and the second movable part 4. Because the first movable part 3 and the main shaft 1 are made of metal, they ensure strength and support, making the fixing mechanism less susceptible to damage and having a long service life.

[0026] 3, 4, and 13, the first movable part 3 has a first restriction surface 31 and a second restriction surface 32. The first restriction surface 31 fits into the upper groove wall of the first sliding track 5, and the second restriction surface 32 fits into the lower groove wall of the first sliding track 5. The position of the track base 2 and the first movable part 3 is restricted by the first restriction surface 31 and the second restriction surface 32 of the first movable part 3 coming into contact with the upper and lower groove walls of the first sliding track 5. The first movable part 3 can only slide relative to the track base 2, and when the first movable part 3 rotates, the track base 2 also rotates.

[0027] Similarly, the sliding portion 42 of the second movable member 4 fits into the second sliding track 6. When the track rail 2 rotates, the second movable member 4 is also rotated around the main shaft 1. The main shaft 1 is arranged in the left-right direction, the second sliding track 6 is also arranged in the left-right direction, the second movable member 4 is installed on the main shaft 1, the track rail 2 is covered by a sleeve on the second movable member 4, and the second movable member 4 is arranged slidably within the second sliding track 6. Therefore, there is a rotation-restricted position between the second movable member 4 and the track rail 2. When the first movable member 3 moves, the track rail 2 is rotated, and the second movable member 4 also rotates together with the track rail 2. The first movable member 3, the second movable member 4, and the track rail 2 all rotate in synchronization with the main shaft 1.

[0028] To summarize the above, the first movable part 3 primarily moves in the forward-backward direction. However, when the chair back is tilted and the chair back connector 8 rotates, the first movable part 3 also rotates to a certain extent. The rotation of the first movable part 3 drives the track base 2, which then drives the second movable part 4, causing it to rotate on the main shaft 1. Because the second movable part 4 is rotatably arranged on the main shaft 1, the second movable part 4 rotates synchronously with the track base 2, which in turn rotates synchronously with the first movable part 3. Therefore, the rotation of the first movable part 3 also rotates around the main shaft 1. Therefore, the only rotation point of the movable assembly is the main shaft 1, and the entire movable assembly can rotate around the main shaft 1. Therefore, when the chair back is tilted and adjusted, the movable assembly also tilts and rotates accordingly. The chair back can tilt and rotate accordingly, and there is no interference between the tilting movement and the movement of the locking mechanism, allowing the chair back to be smoothly locked in place after tilting.

[0029] Furthermore, the axial direction of the main shaft 1 coincides with the fixed direction, and the second movable part 4 is fitted to the main shaft 1 and slides together with the main shaft 1 in the second sliding track 6. The second movable part 4 moves in the fixed direction and is slidably mounted on the main shaft 1. Therefore, after the first movable part 3 moves, the second movable part 4 moves axially along the main shaft 1 and connects with the first movable part 3 to fix the tilt of the chair back and maintain it at the current position. Therefore, the fixed direction is the left-right direction, and the adjustment direction is approximately the front-to-back direction. In the adjustment state, when the chair back rotates, the adjustment direction tilts as the movable assembly swings. When the chair back rotates and the first movable part 3 is driven to move, the first movable part 3 not only displaces, but also rotates with the rotation of the chair back. When the first movable part 3 rotates, the entire movable assembly is driven to rotate around the main shaft 1. Only with the strong adaptability of this mechanism can the chair back tilt be smoothly fixed after rotation. The tilt of the adjustment direction also reflects the adaptability.

[0030] The combination of the first movable part 3 and the second movable part 4 is fixed as follows. As shown in Figures 5, 6, 12, and 13, the first movable part 3 is a long, plate-shaped metal piece and has a receiving groove 13 aligned along the fixed direction. The first movable part 3 extends in the longitudinal direction, and the receiving groove 13 is provided with internal teeth 14, while the locking part 41 of the second movable part 4 is provided with external teeth 15. In the fixed state, the locking part 41 of the first movable part 3 fits into the receiving groove 13, and the first movable part 3 and the second movable part 4 are engaged and fixed via the internal teeth 14 and the external teeth 15. In the adjustment state, the locking part 41 exits the receiving groove 13 and enters the third groove 205, releasing the first movable part 3 and the second movable part 4 from being fixed together. The first movable part 3 can move within the first sliding track 5 as the chair back rotates. The longitudinal direction of the first movable part 3 is the adjustment direction. When the first movable part 3 moves in the adjustment direction, the position of the second movable part 4 corresponding to the receiving groove 13 also changes. When the second movable part 4 is at a different position in the receiving groove 13 and the internal teeth part 14 meshes with the external teeth part 15, the chair back is fixed at a different tilt position, and the tilt angle of the chair back at this time is maintained.

[0031] The force acting on the chair back is transmitted to the first movable part 3 via the chair back connector 8 and the connector pin 9, and the first movable part 3 further transmits the force to the locking part 41 via the meshing of the internal teeth 14 and the external teeth 15. The locking part 41 is disposed directly on the main shaft 1 and transmits the force to the main shaft 1, which then transmits the force to the base 7. To ensure strength and sufficient load-bearing capacity, the base 7, main shaft 1, locking part 41 and first movable part 3 are all formed from high-strength metal parts.

[0032] The density of the internal teeth 14 is greater than 55 teeth / 100 mm. The fine and dense teeth allow for stepless adjustment, and the internal teeth 14 are provided on the upper and lower groove walls of the receiving groove 13, with corresponding external teeth 15 provided on the upper and lower surfaces of the locking portion 41. In this embodiment, the length of the internal teeth 14 is 74 mm, and 42 teeth are arranged therein.

[0033] Example 2 The only difference between this embodiment and the first embodiment is that the locking portion 41 and the sliding portion 42 of the second movable portion 4 are both metal parts. Specifically, the second movable part 4 is a metal part, and includes a locking part 41 and a sliding part 42. The sliding part 42 is disposed within the second sliding track 6 and fits into the second sliding track 6. The locking part 41 is used to fix the first movable part 3 when approaching the first movable part 3. The locking part 41 and the sliding part 42 are integrally formed. The second movable part 4 is a part that supports force, and is made of metal to increase strength. The locking part 41 and the sliding part 42 can be integrally formed, which makes manufacturing more convenient.

[0034] The base also includes an operating lever 16, which is inserted into the base 7 in the left-right direction. A transmission unit is provided between the operating lever 16 and the second movable unit 4. The operating lever 16 is configured to drive the movement of the transmission unit when pulled, and the transmission unit drives the second movable unit 4 to slide within the second sliding track 6, thereby switching the chair back tilt fixing mechanism between an adjustment state and a fixed state. The transmission unit is a torsion spring 17 rotatably attached to the base 7, and both ends of the torsion spring 17 are connected to the operating lever 16 and the second movable unit 4, respectively. An avoidance slot 18 extending in the fixing direction is provided in the track base 2 outside the second movable unit 4. A slot 19 is provided in the second movable unit 4, and one end of the spring arm of the torsion spring 17 is inserted into the slot 19 through the avoidance slot 18. The avoidance slot 18 is configured so that when the operating lever 16 is pulled, the torsion spring drives the second movable part 4 to move within the second sliding track 6, avoiding the movement of the spring arm.

[0035] The locking mechanism can be switched between locked and unlocked by pulling the operating lever 16 to the left or right, making it easy to operate and conveniently accessible. The transmission unit is preferably a torsion spring 17, which is not only low-cost but also simplifies the structure of components such as the mounting base for the torsion spring 17 on the base. As a material for the transmission unit, the torsion spring 17 also provides a cushioning effect when locked. Even when the first and second movable units 3 and 4 are locked and the internal and external teeth 14 and 15 are not fully aligned and engaged, they can be pulled out without any effort. Furthermore, after slightly tilting the chair back, the second movable unit 4 automatically locks to the first movable unit 3 without affecting operation, i.e., the engagement between the internal and external teeth 14 and 15 can be delayed without affecting operation.

[0036] Example 3 The chair back tilt fixing mechanism is applied to a different type of base. Specifically, as shown in FIGS. 15 to 17 , in this embodiment, the base plate has a chair back linking function. This link mechanism includes a seat connector 21, a connecting pin 9, and a rotary slide shaft 22. The seat connector 21 is rotatably attached to the base 7, and a connecting pin 9 is inserted between the seat connector 21 and the first movable part 3. The first movable part 3 and the seat connector 21 are rotatably connected via the connecting pin 9. The rotary slide shaft 22 is disposed on the seat connector 21. The chair back connector 8 is provided with a chute 23. The rotary slide shaft 22 is inserted into the chute 23. The rotary slide shaft 22 and the chute 23 are configured to connect the chair back connector 8 and the seat connector 21. When the chair back connector 8 rotates relative to the base 7, the seat connector 21 is driven to rotate relative to the base 7. The base in this solution allows the back to move when the chair is tilted, thereby driving the seat to rotate relative to the base 7, thereby reducing back chafing and improving comfort.

[0037] The chair back tilting and fixing mechanism is installed vertically within the base, and the first movable part 3 tilts vertically and forward and backward. When the chair back connecting part 8 rotates backward, the first movable part 3 drives the swing of the track 2 and slides downward within the track 2. Specifically, the base 7 has a downwardly protruding extension base 24, on which the main shaft 1 is disposed. The track 2 is disposed within the extension base 24 and includes at least two plates, the two plates being spaced apart along the left and right sides to accommodate the main shaft 1 and the track 2. The extension base 24 can be formed integrally with the base 7 or can be fixedly connected to the base 7 by welding. The extension base 24 is used to increase the vertical volume of the base 7, thereby allowing the vertically arranged fixing mechanism to be conveniently attached to the base 7. In this chair back-linked base, the volume of the base 7, i.e., the internal space of the base, is small, and the thickness of the base 7 is also small, making it relatively difficult to accommodate the above-mentioned fixing mechanism. Therefore, for such a difficult-to-store base, by changing the fixing mechanism that was originally arranged in the front-to-back direction to the up-to-down direction, it is possible to also achieve tilt fixing of the chair back.

[0038] In this embodiment, even if the orientation of the chair backrest tilt fixing mechanism is changed, the operating lever 16 can control the second movable part 4 via the torsion spring 17 as long as the bending of the torsion spring 17 is changed adaptively. [Explanation of symbols]

[0039] Main shaft 1, Orbital platform 2, Rail section 20, Rail body 201, a clamping portion 202 of the rail portion; 1st groove 203, 2nd groove 204, 3rd groove 205, 1st movable part 3, First control surface 31, Second regulating surface 32, 2nd movable part 4, locking portion 41, Sliding part 42, First sliding track 5, Second sliding track 6, Base 7, Chair back connection part 8, Connecting pin 9, Mounting groove 10, Elastic buckle 11, Clamping holes 12, Receiving groove 13, Internal teeth 14, External tooth part 15, Operating lever 16, Torsion spring 17, 18 dodge slots, Slot 19, Seat connection 21, Rotating slide axis 22, Shoot 23, Extension base 24.

Claims

1. An adaptive rocking component used to tilt a chair back, the adaptive rocking component including a main shaft and a movable assembly; The movable assembly is rotatably disposed on a main shaft and swings about the main shaft; the movable assembly includes a track base and first and second movable parts disposed on the track base, the track base including first and second sliding tracks perpendicular to each other, the first and second movable parts sliding within the first and second sliding tracks, respectively; the first movable part is engaged with the first sliding track and can rotate synchronously with the track rail relative to the main shaft, the second movable part is engaged with the second sliding track and can rotate synchronously with the track rail relative to the main shaft, and the first movable part or the second movable part is installed on the main shaft and rotatably connected to the main shaft; A chair back tilt adaptive rocking component, characterized in that:

2. 2. The chair back tilt adaptive rocking component of claim 1, wherein the track base has a through groove to form the first sliding track, the first movable part has a first restriction surface and a second restriction surface, the first restriction surface is fitted into an upper groove wall of the first sliding track, and the second restriction surface is fitted into a lower groove wall of the first sliding track.

3. 3. The chair back tilt adaptive rocking component of claim 2, wherein the main shaft is arranged in the left-right direction, the second sliding track is arranged in the left-right direction, the second movable part is installed on the main shaft, the track base is provided on the second movable part, and the second movable part is slidably arranged in the second sliding track.

4. A chair comprising a back tilt adaptive rocking component according to any one of claims 1 to 3, The sliding track has an adjustment direction and a fixed direction, the adjustment direction coincides with the first sliding track, and the fixed direction coincides with the second sliding track; the first movable part moves in the adjustment direction as the back of the chair rotates, the second movable part moves in the fixing direction, and when the second movable part approaches the first movable part, the first movable part is fixed, and when the second movable part moves away from the first movable part, the first movable part is released from fixing to the first movable part; The chair also has an adjustment state and a fixed state, and in the adjustment state, the first movable part and the second movable part are separated, allowing the chair back to rotate, and the first movable part is driven by the rotation of the chair back to move in the adjustment direction and rotate about the main shaft; on the other hand, in the fixed state, the connection between the first movable part and the second movable part is fixed, and the tilt angle of the chair back is fixed. A mechanism for fixing a tilted backrest of a chair.

5. 5. The mechanism for fixing a backrest tilt of a chair according to claim 4, wherein, in an adjusted state, when the backrest of the chair rotates, the adjustment direction tilts in accordance with the swing of the movable assembly.

6. 5. The chair back tilt fixing mechanism according to claim 4, wherein the axial direction of the main shaft coincides with the fixing direction, and the second movable part is fitted onto the main shaft and cooperates with the sliding of the main shaft in the second sliding track.

7. 7. The chair back tilt fixing mechanism according to claim 6, wherein the main shaft is a metal part.

8. 8. The chair back tilt fixing mechanism according to claim 7, wherein the second movable part is a metal part, the second movable part includes a locking part and a sliding part, the sliding part is installed in the second sliding track and fitted into the second sliding track, the locking part is used to couple with and fix the first movable part when approaching the first movable part, and the locking part and the sliding part are integrally formed.

9. the second movable part includes a locking part and a sliding part, the sliding part is installed on the second sliding track and fitted into the second sliding track, the locking part is used to couple with and fix the first movable part when approaching the first movable part, the locking part and the sliding part are connected side by side, the locking part is a metal part, and the sliding part is a plastic part; 8. The chair back tilt fixing mechanism according to claim 7.

10. The first movable part has an accommodation groove in the fixed direction, the accommodation groove extends along the length direction of the first movable part, the accommodation groove is provided with an internal toothed part, and the second movable part is provided with an external toothed part, and in a fixed state, the first movable part enters the accommodation groove, and the first movable part and the second movable part are engaged and fixed via the internal toothed part and the external toothed part.

5. The mechanism for fixing the backrest tilt of a chair according to claim 4.

11. 5. The mechanism for fixing a tilted backrest of a chair according to claim 4, wherein the track base is formed by joining two rail portions symmetrically arranged on the left and right.

12. a base, a chair back connection part, and the chair back tilt locking mechanism according to any one of claims 4 to 11; The chair back tilt fixing mechanism is rotatably mounted on the base, and the main shaft is mounted on the base along the left-right direction; a link mechanism between the chair back tilt fixing mechanism and the chair back connection, the link mechanism being configured to rotate the movable assembly about the main axis when the chair back connection rotates relative to the base; When the chair back tilt locking mechanism is in an adjusted state, the chair back linkage can rotate relative to the base, and when the chair back tilt locking mechanism is in a locked state, the chair back tilt locking mechanism locks rotation between the chair back linkage and the base, and the chair back linkage is held in a rotated position. A base plate characterized by:

13. The base of claim 12, wherein the base has an upwardly opening mounting groove, and the chair back tilt fixing mechanism is disposed within the mounting groove.

14. The base plate of claim 12, further comprising an operating lever, the operating lever being inserted into the base in the left-right direction, a transmission unit being provided between the operating lever and the second movable part, the operating lever driving and moving the transmission unit by pulling the operating lever, the transmission unit driving the second movable part to slide within the second sliding track, and the back tilt fixing mechanism of the chair being arranged to switch between an adjustment state and a fixed state.

15. The base plate described in claim 14, characterized in that the transmission part is a torsion spring, the torsion spring is rotatably installed on the base, and both ends of the torsion spring are respectively connected to the operating lever and the second movable part.

16. The base plate of claim 15, characterized in that the outer track of the second movable part is provided with an escape slot extending in a fixed direction, the second movable part is provided with a slot, and the spring arm at one end of the torsion spring is inserted into the slot through the escape slot, so that when the operating lever is pulled, the torsion spring drives the second movable part to move within the second sliding track, and the escape slot is configured not to interfere with the movement of the spring arm of the torsion spring.

17. The base plate described in claim 12, characterized in that the link mechanism is a connecting pin, the connecting pin is inserted into the connection portion between the first movable part and the chair backrest, and the first movable part and the chair backrest connection portion are rotatably connected via the connecting pin.

18. The link mechanism includes a seat connecting portion, a connecting pin, and a rotation slide shaft, the seat connection portion is rotatably disposed on the base, the connecting pin is installed through the seat connecting portion and the first movable portion, and the first movable portion and the seat connecting portion are rotatably connected via the connecting pin; The rotation slide shaft is provided at the seat connection part, a chute is provided at the backrest connection part of the chair, and the rotation slide shaft is inserted into the chute, the rotary slide shaft and the chute connect the chair back connection portion and the seat connection portion and are arranged to drive the seat connection portion to rotate relative to the base when the chair back connection portion rotates relative to the base; The base plate according to claim 12.

19. The base plate described in claim 12, characterized in that the chair backrest tilt fixing mechanism is vertically installed within the base plate, the first movable part tilts vertically and in the forward and backward directions, and when the chair backrest connecting part rotates backward, the first movable part drives the track base to swing and slide downward.

20. The base plate of claim 19, wherein the base has a downwardly convex extension base, the main shaft is disposed on the extension base, and the track is disposed within the extension base.

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