Rotary adjusting mechanism and foot support assembly of seat

Abstract

The utility model discloses a rotation adjusting mechanism and a foot support assembly of a seat. The rotation adjusting mechanism comprises a mounting seat, a rotating seat, a locking piece and an elastic piece, the rotating seat is pivoted on the mounting seat, and the locking piece and the elastic piece are arranged between the mounting seat and the rotating seat; a pushing inclined surface, a supporting end surface and a shifting part are arranged on the rotating seat; the locking piece is provided with a hanging part, the mounting seat is provided with a hanging groove, the hanging part can be embedded in the hanging groove, so that the locking piece is prevented from rotating around the axis relative to the mounting seat through matching of the hanging part and the hanging groove, and the locking piece is prevented from moving in the direction close to the rotating seat along the axis relative to the mounting seat; and an inclined guide wall is formed on one side of the hanging groove. The angle of the rotating seat relative to the mounting seat can be adjusted only by operating the rotating seat with one hand, and the operation process is simple and convenient.

Description

Technical Field

[0001] This utility model relates to the field of seat technology, specifically to a rotation adjustment mechanism and a seat footrest assembly. Background Technology

[0002] Some office chairs and ergonomic chairs are typically equipped with footrest components to enhance comfort. These components include a telescopic rod connected to the chair's support frame and a footrest attached to the rod. The footrest is rotatably connected to the end of the telescopic rod, allowing it to be adjusted relative to the rod. In use, the footrest is pulled out from under the chair and rotated to a suitable angle. When not in use, the footrest is rotated to fold in place, and then pushed back to the bottom of the chair. While existing footrest components allow for adjustment, flipping the footrest requires the user to operate a switch mechanism between the footrest and the telescopic rod with one hand to unlock it, and then rotate the footrest with the other hand, making the process somewhat cumbersome. Utility Model Content

[0003] The purpose of this utility model is to provide a rotation adjustment mechanism and a footrest assembly for a seat, which can adjust the rotation angle with just one hand, making it simple and convenient to operate.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] The rotation adjustment mechanism includes a mounting base, a rotating base, a locking element, and a spring element;

[0006] The rotating seat is pivotally connected to the mounting seat so that the rotating seat can rotate relative to the mounting seat about an axis. The locking element and the elastic element are disposed between the mounting seat and the rotating seat. The elastic element is used to apply elastic stress to the locking element so that the locking element always tends to move towards the rotating seat.

[0007] The rotating base is provided with a pushing inclined surface, a supporting end face, and a toggle part. The pushing inclined surface cooperates with the locking member to push the locking member from a first position away from the mounting base to a second position close to the mounting base when the rotating base rotates counterclockwise relative to the mounting base around the axis. The supporting end face is connected to the end of the pushing inclined surface close to the mounting base and is used to abut against the locking member when the locking member is in the second position. The toggle part is used to toggle the locking member from a third position to a fourth position counterclockwise relative to the mounting base when the locking member is abutted by the supporting end face.

[0008] The locking member is provided with a hook-on part, and the mounting base is provided with a hook-on groove. When the locking member is in the fourth position, the hook-on part is embedded in the hook-on groove. The hook-on part and the hook-on groove cooperate to prevent the locking member from rotating about the axis relative to the mounting base and to prevent the locking member from moving about the axis towards the rotating base relative to the mounting base. A slanted guide wall is formed on one side of the hook-on groove. When the actuating part rotates clockwise about the axis relative to the mounting base with the rotating base to make the actuating part actuate the locking member to rotate clockwise about the axis relative to the mounting base, the slanted guide wall is used to push the locking member to disengage the hook-on part from the hook-on groove.

[0009] Preferably, the rotating seat is provided with a boss extending toward the mounting seat, one side of the boss forms a pushing slope, the end face of the boss facing the mounting seat forms a supporting end face, and the locking member is provided with a recess for receiving the boss at one end facing the rotating seat, and a mating slope matching the pushing slope is provided on one side of the recess.

[0010] Preferably, the actuating part is located on the inner edge of the boss, the actuating part extends along the axis toward the mounting base and protrudes from the support end face, and the locking member has a through hole in the middle for the actuating part to pass through. The inner wall of the through hole is provided with a stop block extending along the axis. The stop block cooperates with the actuating part so that the actuating part can actuate the stop block to rotate around the axis.

[0011] Preferably, the mounting base is provided with a mounting groove that is recessed from the end of the mounting base facing the rotating base to the direction away from the rotating base, and both the locking member and the elastic member are located in the mounting groove; the inner wall of the mounting groove is provided with a sliding groove extending along the axis; the outer periphery of the locking member is provided with a slider that slides and is embedded in the sliding groove.

[0012] Preferably, one side of the slider is provided with a notch recessed towards the mounting base from the end of the slider facing the rotating seat. A hook-up portion protruding towards the rotating seat is formed between the notch and the side wall of the slider on that side. The side of the hook-up portion away from the notch forms an inclined wall surface. The opening of the hook-up groove faces away from the rotating seat. A protrusion protruding away from the rotating seat is formed between one side wall of the groove away from the rotating seat and the hook-up groove. The side wall of the hook-up groove near the protrusion forms an inclined guide wall, and the side of the hook-up groove away from the protrusion forms a baffle wall. When the locking member is in the fourth position, the protrusion is engaged in the notch.

[0013] Preferably, the inner wall of the mounting groove is provided with two sliding grooves that are staggered around the circumference of the mounting base, and the outer periphery of the locking member is provided with two sliders, which are slidably embedded in the two sliding grooves respectively.

[0014] Preferably, the locking component has a through hole in the middle, the rotating seat has a shaft hole, a rotating shaft passes through the shaft hole, and the rotating shaft passes through the through hole of the locking component and is fixedly connected to the mounting seat by bolts.

[0015] Preferably, the elastic element is a spring sleeved on the outside of the rotating shaft, with both ends of the spring abutting against the locking element and the mounting base, respectively.

[0016] The seat footrest assembly includes the aforementioned rotation adjustment mechanism, movable rod, fixed seat, and footrest. The movable rod passes through the fixed seat and is movable relative to the fixed seat. The mounting seat of the rotation adjustment mechanism is fixedly connected to the end of the movable rod, and the footrest is connected to the rotating seat of the rotation adjustment mechanism.

[0017] Preferably, the mounting base has an internal mounting hole, and two opposing and interlocking gaskets are provided in the mounting hole. A guide hole is formed between the two gaskets, and the movable rod passes through the guide hole.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] In use, the rotating adjustment mechanism of this utility model rotates the rotating seat counterclockwise relative to the mounting seat. After the rotating seat rotates to a predetermined angle, the locking member moves between the rotating seat and the mounting seat to the locked state. The locking member locks the rotating seat and the mounting seat, preventing the rotating seat from continuing to rotate around the mounting seat. When it is necessary to reset the rotating seat, rotating the rotating seat clockwise will move the locking member between the rotating seat and the mounting seat to the unlocked state. The user only needs to operate the rotating seat with one hand to adjust the angle of the rotating seat relative to the mounting seat. The operation process is simple and convenient. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the footrest assembly of the seat according to this utility model;

[0021] Figure 2 for Figure 1 Schematic diagram of the central rotation adjustment mechanism;

[0022] Figure 3 for Figure 2 Schematic diagram of the middle mounting base;

[0023] Figure 4 for Figure 2 Schematic diagram of the central locking component;

[0024] Figure 5 This is a schematic diagram showing the cooperation between the locking component and the rotating seat of this utility model;

[0025] Figure 6 for Figure 5 View from direction A;

[0026] Figure 7 This is a schematic diagram of the locking component of this utility model in the third position;

[0027] Figure 8This is a schematic diagram of the locking component of this utility model in the fourth position;

[0028] Figure 9 This is a schematic diagram showing the reset state of the rotating seat of this utility model;

[0029] Figure 10 This is a schematic diagram of the installation of the footrest assembly of the seat according to this utility model.

[0030] The components are as follows: 100, Rotation adjustment mechanism; 10, Mounting base; 101, End face; 11, Mounting groove; 12, Slide groove; 121, Side wall; 13, Hanging groove; 131, Baffle wall; 14, Inclined guide wall; 15, Protrusion; 20, Rotating seat; 201, End face; 21, Boss; 211, Pushing inclined surface; 212, Supporting end face; 22, Actuating part; 30, Locking part; 301, End face; 302, End face; 303, Through hole; 31, Recess; 311, Mating inclined surface; 32, Stop block; 33, Sliding block; 331, Notch; 332, Hanging part; 333, Inclined wall surface; 40, Spring; 50, Rotating shaft; 60, Movable rod; 70, Fixed base; 701, Mounting hole; 71, Gasket; 80, Foot support. Detailed Implementation

[0031] The present invention will now be further described in conjunction with the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Unless otherwise specified, the materials and equipment used in this embodiment are all commercially available. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0032] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In the description of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0033] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected," "linked," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a connection through an intermediary, or a connection within two elements or an interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0034] like Figure 1 , 2 As shown in Figures 3 and 4, this utility model discloses a footrest assembly for a seat, comprising a rotation adjustment mechanism 100, a movable rod 60, a fixed seat 70, and a footrest 80. The movable rod 60 passes through the fixed seat 70 and is movable relative to the fixed seat 70. The rotation adjustment mechanism 100 includes a mounting base 10, a rotating seat 20, a locking member 30, and a spring 40. The mounting base 10 of the rotation adjustment mechanism 100 is fixedly connected to the end of the movable rod 60, and the footrest 80 is connected to the rotating seat 20 of the rotation adjustment mechanism 100. The fixed seat 70 is installed under the seat base or cushion. The movable rod 60 can move back and forth relative to the fixed seat 70, thereby allowing the footrest 80 to be pulled forward from under the seat cushion. The rotation adjustment mechanism 100 is used to adjust the angle of the footrest 80 relative to the movable rod 60. The specific structure of the rotation adjustment mechanism 100 is described in detail below:

[0035] In the rotation adjustment mechanism 100, the rotating seat 20 is pivotally connected to the mounting seat 10, so that the rotating seat 20 can rotate relative to the mounting seat 10 about the axis O1. The locking member 30 and the spring 40 are installed between the rotating seat 20 and the mounting seat 10. The spring 40 is disposed between the locking member 30 and the mounting seat 10. The spring 40 applies elastic stress to the locking member 30 so that the locking member 30 always maintains the tendency to move towards the rotating seat 20 along the axis O1.

[0036] The rotating seat 20 has a pushing inclined surface 211, a supporting end face 212, and a toggle part 22 on its end face 201 facing the mounting seat 10. In the clockwise direction b, the pushing inclined surface 211 gradually moves closer to the mounting seat 10. Thus, the pushing inclined surface 211 cooperates with the locking member 30. When the rotating seat 20 rotates around the axis O1 in the counterclockwise direction a relative to the mounting seat 10, the pushing inclined surface 211 can be used to push the locking member 30 toward the mounting seat 10, thereby moving the locking member 30 from a first position away from the mounting seat 10 to a second position closer to the mounting seat 10. The supporting end face 212 is connected to the end of the pushing inclined surface 211 that is close to the mounting seat 10. When the pushing inclined surface 211 pushes the locking member 30 to the second position as the rotating seat 20 rotates, the supporting end face 212 abuts against the end face 302 of the locking member 30, keeping the locking member 30 in the second position.

[0037] When the rotating seat 20 rotates relative to the mounting seat 10 to a predetermined position, the actuating part 22 can actuate the locking member 30, so that the locking member 30 can rotate together with the rotating seat 20 around the axis O1. For example, when the locking member 30 is abutted by the support end face 212, the locking member 30 is held in the second position in the extension direction of the axis O1. At this time, if the rotating seat 20 continues to rotate in the counterclockwise direction a, the actuating part 22 on the rotating seat 20 can actuate the locking member 30, so that the locking member 30 rotates relative to the mounting seat 10 in the counterclockwise direction a. That is, under the drive of the actuating part 22, the locking member 30 can rotate from the third position to the fourth position relative to the mounting seat 10 in the counterclockwise direction a.

[0038] The locking member 30 is provided with a hooking part 332, and the mounting base 10 is provided with a hooking groove 13. When the locking member 30 is in the fourth position, the hooking part 332 is embedded in the hooking groove 13. Through the cooperation between the hooking part 332 and the hooking groove 13, the locking member 30 can be prevented from rotating relative to the mounting base 10 around the axis O1, and at the same time, the locking member 30 is prevented from moving towards the rotating base 20 along the axis O1 relative to the mounting base 10. At this time, the locking member 30 cannot continue to rotate relative to the mounting base 10 in the counterclockwise direction a. Since the actuating part 22 on the rotating base 20 is blocked by the locking member 30, the rotating base 20 is limited by the locking member 30, that is, the rotating base 20 cannot continue to rotate relative to the mounting base 10 in the counterclockwise direction a.

[0039] A sloping guide wall 14 is formed on one side of the mounting groove 13, and the other side of the mounting groove 13 is used to stop the mounting part 332 to prevent the locking member 30 from continuing to rotate in the counterclockwise direction a when it is in the fourth position. The sloping guide wall 14 can guide the mounting part 332. When the locking member 30 is in the fourth position, when the locking member 30 rotates in the clockwise direction b relative to the mounting base 10, the sloping guide wall 14 pushes the mounting part 332 towards the outside of the mounting groove 13, so that the mounting part 332 disengages from the mounting groove 13. Then, the elastic stress of the spring 40 is used to move the locking member 30 along the axis O1 towards the rotating base 20 to the first position.

[0040] When the aforementioned hook-on portion 332 engages with the hook-on groove 13, the locking member 30 and the mounting base 10 form a one-way mechanism, preventing the locking member 30 from rotating relative to the mounting base 10 in the counterclockwise direction a, and only allowing the locking member 30 to rotate relative to the mounting base 10 in the clockwise direction b. After the rotating base 20 rotates a predetermined angle relative to the mounting base 10 in the clockwise direction b, the actuating portion 22 on the rotating base 20 actuates the locking member 30 to rotate relative to the mounting base 10 in the clockwise direction b, causing the hook-on portion 332 of the locking member 30 to disengage from the hook-on groove 13, and then causing the locking member 30 to move to the first position along the axis O1.

[0041] In use, the rotating adjustment mechanism 100 of this utility model allows the rotating seat 20 to rotate counterclockwise relative to the mounting seat 10. After the rotating seat 20 rotates to a predetermined angle, the locking member 30 moves between the rotating seat 20 and the mounting seat 10 to a locked state. The locking member 30 locks the rotating seat 20 to the mounting seat 10, preventing the rotating seat 20 from continuing to rotate around the mounting seat 10. When it is necessary to reset the rotating seat 20, rotating the rotating seat 20 clockwise will allow the locking member 30 to move between the rotating seat 20 and the mounting seat 10 to an unlocked state. Thus, the user only needs to operate the rotating seat 20 with one hand to adjust the angle of the rotating seat 20 relative to the mounting seat 10, making the operation simple and convenient.

[0042] In a preferred embodiment, the pushing slope 211 and the supporting end face 212 on the rotating seat 20 are formed by a boss 21 provided on the rotating seat 20. Specifically, the boss 21 is provided on the end face 201 of the rotating seat 20 facing the mounting base 10, and the boss 21 extends towards the mounting base 10. A pushing slope 211 is formed on one side of the boss 21, and a supporting end face 212 is formed on the end face 302 of the boss 21 facing the mounting base 10. A recess 31 for receiving the boss 21 is provided on the end face 302 of the locking member 30 facing the rotating seat 20. The side is provided with a mating inclined surface 311 that matches the pushing inclined surface 211. When the locking member 30 is in the first position, the boss 21 is completely embedded in the recess 31. When the rotating seat 20 rotates in the counterclockwise direction a, the pushing inclined surface 211 presses against the mating inclined surface 311, which can convert the rotation of the rotating seat 20 into the axial movement of the locking member 30. When the pushing inclined surface 211 disengages from the pressing mating inclined surface 311, the supporting end face 212 just supports the end face 302 of the locking member 30. In this way, the supporting end face 212 supports the locking member 30.

[0043] The actuating part 22 is located on the inner edge of the boss 21. The actuating part 22 extends along the axis O1 toward the mounting base 10 and protrudes from the support end face 212. A through hole 303 is provided in the middle of the locking member 30. The through hole 303 extends through the end face 301 of the locking member 30 toward the mounting base 10 to the end face 302 toward the rotating base 20. The part of the actuating part 22 protruding from the boss 21 passes through the through hole 303. A stop block 32 extending along the axis O1 is provided on the inner wall of the through hole 303. The stop block 32 cooperates with the actuating part 22. When the actuating part 22 rotates with the rotating base 20, the actuating part 22 contacts the stop block 32. Then the actuating part 22 can push the stop block 32, so that the locking member 30 can rotate with the rotating base 20.

[0044] A mounting groove 11 is provided on the mounting base 10. The mounting groove 11 is recessed from the end face 101 of the mounting base 10 toward the rotating base 20 in a direction away from the rotating base 20. The locking member 30 and the spring 40 are both installed inside the mounting groove 11. The inner wall of the mounting groove 11 is provided with a sliding groove 12 extending along the axis O1. The outer periphery of the locking member 30 is provided with a sliding block 33 that is slidably embedded in the sliding groove 12. The sliding groove 12 and the sliding block 33 cooperate with each other to guide the movement of the locking member 30 relative to the mounting base 10 along the axis O1. When the rotating base 20 rotates counterclockwise, the pushing inclined surface 211 presses the locking member 30, and the locking member 30 moves along the sliding groove 12 in a direction away from the rotating base 20. Under the limitation of the sliding groove 12, the locking member 30 is prevented from rotating relative to the mounting base 10.

[0045] When the slider 33 slides to the end of the slide groove 12 away from the rotating seat 20, the slide groove 12 no longer restricts the rotation of the locking member 30 relative to the mounting seat 10, so that the actuating part 22 can actuate the locking member 30 to rotate relative to the mounting seat 10, and then the hook part 332 on the locking member 30 can be inserted into the hook groove 13 after rotating relative to the mounting seat 10, thereby locking the rotating seat 20 and the mounting seat 10.

[0046] Specifically, the hook-on portion 332 is provided on the slider 33; a notch 331 is provided on one side of the slider 33, recessed towards the mounting base 10 from the end of the slider 33 facing the rotating seat 20. A hook-on portion 332 protruding towards the rotating seat 20 is formed between the notch 331 and the side wall of the slider 33 on this side. An inclined wall surface 333 is formed on the side of the hook-on portion 332 away from the notch 331. The hook-on groove 13 is provided on the inner wall surface of the mounting groove 11, and the opening of the hook-on groove 13 faces away from the rotating seat 20. A protrusion 15 protruding away from the rotating seat 20 is formed between the end of one side wall 121 of the slide groove 12 away from the rotating seat 20 and the hook-on groove 13. An inclined guide wall 14 is formed on the side wall of the hook-on groove 13 near the protrusion 15, and a baffle wall 131 is formed on the side of the hook-on groove 13 away from the protrusion 15. When the locking member 30 is in the first position... In the fourth position, the protrusion 15 is engaged in the notch 331, thereby engaging the hook part 332 in the hook groove 13. Since the hook groove 13 forms a baffle 131 on the side away from the protrusion 15, the baffle 131 abuts against the hook part 332, preventing the locking member 30 from rotating in the counterclockwise direction a. Then, the locking member 30 prevents the rotating seat 20 from rotating relative to the mounting seat 10 in the counterclockwise direction a. When the locking member 30 rotates in the clockwise direction b, the inclined guide wall 14 pushes the hook part 332 away from the rotating seat 20, so that the locking member 30 overcomes the elastic stress of the spring 40. Then, the inclined guide wall 14 pushes the hook part 332 out of the hook groove 13. After the hook part 332 is separated from the hook groove 13, the elastic stress of the spring 40 can push the locking member 30 towards the rotating seat 20, thereby resetting the locking member 30 to the first position.

[0047] During use, after rotating the rotating seat 20 counterclockwise by a predetermined angle, the pushing inclined surface 211 pushes the locking member 30 from the initial first position to the second position. At this time, the locking member 30 is in a... Figure 5 , 6 At the position shown in Figure 7, the locking member 30 is in the third position. When the rotating seat 20 continues to rotate counterclockwise in direction a, the inclined wall surface 333 of the locking member 30 contacts the protrusion 15. The protrusion 15 presses against the inclined wall surface 333, causing the locking member 30 to move a small distance away from the rotating seat 20 until the hook part 332 on the locking member 30 crosses the protrusion 15. Then, the elastic stress of the spring 40 causes the locking member 30 to move a small distance closer to the rotating seat 20, so that the hook part 332 is engaged in the hook groove 13, that is, the locking member 30 is in the position shown in Figure 7. Figure 8 As shown in the diagram, the locking element 30 is in the fourth position, locking the rotating seat 20 and the mounting base 10. The rotating seat 20 cannot continue to rotate counterclockwise in the direction a. When the rotating seat 20 needs to be reset, as... Figure 9As shown, rotating the rotating seat 20 clockwise in direction b causes the actuating part 22 on the rotating seat 20 to abut against the stop 32 of the locking member 30 after rotating a predetermined angle. At this time, continuing to rotate the rotating seat 20 clockwise in direction b will push the locking member 30 to rotate clockwise in direction b, and then... Figure 8 In the state shown, the hook part 332 disengages from the hook groove 13, and then the locking member 30 is reset to the first position by the elastic stress of the spring 40.

[0048] The rotating base 20 has a shaft hole, through which a rotating shaft 50 passes. The rotating shaft 50 passes through a through hole 303 in the middle of the locking member 30 and extends into the mounting base 10. A bolt passes through the rotating shaft 50 and is screwed onto the mounting base 10, thereby fixing the rotating shaft 50 to the mounting base 10. The rotating base 20 is pivotally connected to the mounting base 10 by the rotating shaft 50. The aforementioned spring 40 is sleeved on the outside of the rotating shaft 50, with its two ends abutting against the end face 301 of the locking member 30 and the mounting base 10, respectively. In other embodiments, the spring 40 can be replaced by other elastic elements, such as a spring sheet installed between the locking member 30 and the mounting base 10, or an elastic rubber block.

[0049] See Figure 1 and Figure 10 As shown, in the footrest assembly of this utility model seat, in order to enable the movable rod 60 to move stably back and forth relative to the fixed base 70, a mounting hole 701 is provided inside the fixed base 70. Two opposing washers 71 are provided inside the mounting hole 701. The two washers 71 are interlocked together and together form a guide hole. The movable rod 60 passes through the guide hole, allowing it to be movably mounted on the fixed base 70. The washers 71 eliminate the assembly gap between the movable rod 60 and the fixed base 70, enabling the movable rod 60 to move stably back and forth. Other structures of the footrest assembly of this utility model seat are the same as those in the prior art and will not be described in detail here.

[0050] It should be noted that the above example only illustrates the use of the rotation adjustment mechanism 100 in the footrest assembly of the seat. The rotation adjustment mechanism 100 of this utility model can not only be used in the footrest assembly of the seat, but also in other structures of the seat. For example, the rotation adjustment mechanism 100 can be used in the adjustment structure of the headrest, lumbar support and other components of the seat.

[0051] Finally, it should be noted that the above embodiments are only optional embodiments of this utility model and should not be used to limit the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A rotation adjustment mechanism, characterized in that, Includes mounting base, rotating base, locking element, and elastic element; The rotating seat is pivotally connected to the mounting seat so that the rotating seat can rotate relative to the mounting seat about an axis. The locking element and the elastic element are disposed between the mounting seat and the rotating seat. The elastic element is used to apply elastic stress to the locking element so that the locking element always tends to move towards the rotating seat. The rotating base is provided with a pushing inclined surface, a supporting end face, and a toggle part. The pushing inclined surface cooperates with the locking member to push the locking member from a first position away from the mounting base to a second position close to the mounting base when the rotating base rotates counterclockwise relative to the mounting base around the axis. The supporting end face is connected to the end of the pushing inclined surface close to the mounting base and is used to abut against the locking member when the locking member is in the second position. The toggle part is used to toggle the locking member from a third position to a fourth position counterclockwise relative to the mounting base when the locking member is abutted by the supporting end face. The locking member is provided with a hook-on part, and the mounting base is provided with a hook-on groove. When the locking member is in the fourth position, the hook-on part is embedded in the hook-on groove. The hook-on part and the hook-on groove cooperate to prevent the locking member from rotating about the axis relative to the mounting base and to prevent the locking member from moving about the axis towards the rotating base relative to the mounting base. A slanted guide wall is formed on one side of the hook-on groove. When the actuating part rotates clockwise about the axis relative to the mounting base with the rotating base to make the actuating part actuate the locking member to rotate clockwise about the axis relative to the mounting base, the slanted guide wall is used to push the locking member to disengage the hook-on part from the hook-on groove.

2. The rotation adjustment mechanism as described in claim 1, characterized in that, The rotating base is provided with a boss extending toward the mounting base. One side of the boss forms a pushing slope, and the end face of the boss facing the mounting base forms a supporting end face. The locking member is provided with a recess for receiving the boss at one end facing the rotating base, and a mating slope matching the pushing slope is provided on one side of the recess.

3. The rotation adjustment mechanism as described in claim 2, characterized in that, The actuating part is located on the inner edge of the boss. The actuating part extends along the axis toward the mounting base and protrudes from the support end face. The locking part has a through hole in the middle for the actuating part to pass through. The inner wall of the through hole has a stop block extending along the axis. The stop block cooperates with the actuating part so that the actuating part can move the stop block to rotate around the axis.

4. The rotation adjustment mechanism as described in claim 1, characterized in that, The mounting base has a recessed mounting groove extending from the end of the mounting base facing the rotating seat away from the rotating seat. Both the locking element and the elastic element are located within the mounting groove. The inner wall of the mounting groove has a sliding groove extending along the axis. The outer periphery of the locking element has a sliding slider embedded in the sliding groove.

5. The rotation adjustment mechanism as described in claim 4, characterized in that, One side of the slider is provided with a notch that is recessed towards the mounting base from the end of the slider facing the rotating seat. A hook-up portion protruding towards the rotating seat is formed between the notch and the side wall of the slider on this side. The side of the hook-up portion away from the notch forms an inclined wall surface. The opening of the hook-up groove faces away from the rotating seat. A protrusion protruding away from the rotating seat is formed between one of the side walls of the groove and the end away from the rotating seat. The side wall of the hook-up groove near the protrusion forms an inclined guide wall, and the side of the hook-up groove away from the protrusion forms a baffle wall. When the locking member is in the fourth position, the protrusion is engaged in the notch.

6. The rotation adjustment mechanism as described in claim 5, characterized in that, The inner wall of the mounting slot is provided with two sliding grooves that are staggered around the circumference of the mounting base. The outer periphery of the locking element is provided with two sliders, which are slidably embedded in the two sliding grooves respectively.

7. The rotation adjustment mechanism as described in claim 1, characterized in that, The locking component has a through hole in the middle, and the rotating seat has a shaft hole. A rotating shaft passes through the shaft hole and is fixed to the mounting seat by bolts after passing through the through hole of the locking component.

8. The rotation adjustment mechanism as described in claim 7, characterized in that, The elastic element is a spring sleeved on the outside of the rotating shaft, with its two ends abutting against the locking element and the mounting base, respectively.

9. A footrest assembly for a seat, characterized in that, It includes a rotation adjustment mechanism, a movable rod, a fixed base, and a foot support as described in any one of claims 1-8. The movable rod passes through the fixed base and is movable relative to the fixed base. The mounting base of the rotation adjustment mechanism is fixedly connected to the end of the movable rod, and the foot support is connected to the rotating base of the rotation adjustment mechanism.

10. The footrest assembly of the seat as claimed in claim 9, characterized in that, The mounting base has an internal mounting hole with two opposing and interlocking washers inside. A guide hole is formed between the two washers, and the movable rod passes through the guide hole.

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