Three-section intelligent control armrest and swivel chair

Abstract

The invention relates to the technical field of seats, in particular to a three-section intelligent control armrest and a swivel chair, and the three-section intelligent control armrest comprises a supporting piece, a swinging piece, a face supporting piece, a locking assembly and an armrest piece. The swing piece horizontally swings with the end of the supporting piece as the axis. One end of the transmission shaft penetrates through the swing piece, and the end of the transmission shaft is fixedly connected with the end of the face supporting piece. An open mounting groove is formed in the end of the swing part, and a locking area and a hanging table area are adjacently arranged in the mounting groove. The hinge rotating teeth are located in the mounting groove and fixed to the transmission shaft. And the circumferential side of the hinge rotating tooth is in meshed connection with the locking area. One end of the reset spring is fixedly connected into the mounting groove, and the other end of the reset spring is fixedly connected to the face supporting piece. The supporting piece is arranged on the body of the swivel chair, the height of the armrest piece is adjusted through the supporting piece, the swinging piece can horizontally swing, and the pitching angle of the armrest face of the armrest piece can be adjusted through the face supporting piece so as to meet the sitting posture requirements of different users, use is more comfortable, and the adjusting range is wider.

Description

Technical Field

[0001] The present invention relates to the technical field of seats, and in particular to a three-section intelligently controlled armrest and a swivel chair. Background Art

[0002] The spatial position and height of the existing office chair armrests are relatively fixed. However, in actual application, everyone's body shape varies greatly, so the requirements for the height, level and armrest spacing of the armrests are different. Even for the same person, the requirements for the position of the chair armrests are different when adopting different sitting postures or in different occasions. Sitting in a chair with fixed armrests for a long time will cause the user's muscles, ligaments, fascia, joint capsules and other soft tissues to be in a state of tension, causing the shoulder muscles to be fatigued and exceed the physiological load. Alleviating the above hazards has become an important research topic for health organizations or related companies in various countries. Therefore, adjustable chair armrests according to user needs have come into being.

[0003] Existing armrests can be raised and lowered and horizontally rotated for adjustment. However, when users lean on a swivel chair to read documents or the like, they can only place their arms on the armrests, and their elbows still need to bear a large weight. Over time, this can easily lead to elbow pain and inconvenience in use. Summary of the Invention

[0004] In order to solve the technical defects raised in the above background technology, the purpose of the present invention is to provide a three-section intelligent control armrest and a swivel chair.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] The three-section intelligent control armrest comprises a support member, a swing member hingedly connected to one end of the support member, a face support member hingedly connected to the end of the swing member away from the support member, a locking assembly for locking the face support member, and an armrest member arranged on the face support member; the swing member swings horizontally with the end of the support member as the axis, and the locking assembly comprises a transmission shaft, a hinge tooth, a locking unit and a return spring; one end of the transmission shaft passes through the swing member, and the end of the transmission shaft is fixedly connected to the end of the face support member; the end of the swing member is provided with an open mounting groove, A locking area and a hanging area are adjacently arranged in the mounting groove; the hinge tooth is located in the mounting groove and fixed on the transmission shaft; the circumferential side of the hinge tooth is meshed and connected with the locking area; one end of the return spring is fixedly connected to the inside of the mounting groove, and the other end of the return spring is fixedly connected to the surface support member; when the locking unit is located in the locking area, the circumferential side of the hinge tooth is meshed and connected with the locking area; when the locking unit is located in the hanging area, the return spring, the hinge tooth, the surface support member and the armrest member return to their initial positions.

[0007] By adopting the above technical solution, the support member is set on the main body of the swivel chair, the height of the armrest member can be adjusted through the support member, the swing member can swing horizontally, and the armrest member can adjust the pitch angle of the armrest surface through the face support member, so as to adapt to the sitting posture requirements of different users and make it more comfortable to use. Moreover, the swing member and the face support member can cooperate to adjust the spatial position of the armrest surface. After the user lies down, the wrist is placed on the armrest surface, which can effectively relieve the stress on the wrist, improve comfort and make adjustment more convenient. Through the cooperation of the locking unit and the hinge gear, the armrest member can be stopped at any time during the adjustment process, and the reset spring can achieve automatic reset, which is simple to operate, easy to use and has higher compatibility.

[0008] Furthermore, the locking assembly includes a first chain plate and a second chain plate. The first chain plate and the second chain plate are arranged in parallel and spaced apart and fixedly connected by a pin. The locking unit includes a gear engaging tooth, which is fixed between the first chain plate and the second chain plate. The end surface of the gear engaging tooth is meshed with the end surface of the hinge rotating tooth. The gear engaging tooth is movably arranged between the locking area and the hanging platform area to improve the stability of the structural connection. One tooth corresponds to one gear position, which is easy to adjust.

[0009] Furthermore, both the first and second chain plates are provided with limiting grooves, one side of the limiting groove being provided with a step portion located in the hanging area, and the other side of the limiting groove being located in the locking area. The two sides of the gear engaging teeth are movably arranged in the corresponding limiting grooves. The circumferential side of the hinge rotating tooth is provided with a groove, and the bottom of the groove is provided with teeth that mesh with the gear engaging teeth. The two side walls of the groove can drive the gear engaging teeth to disengage or be locked in the step portion, so that automatic reset can be achieved, making it simpler and more convenient to use.

[0010] Furthermore, the locking unit further includes a stopper fixed between the first and second chain plates. A guide arc surface is provided on the side of the stopper facing the gear engaging tooth, and the side of the gear engaging tooth facing away from the hinge rotating tooth abuts against the guide arc surface. This allows for a more compact connection between the gear engaging tooth and the hinge rotating tooth, guides the movement of the gear engaging tooth, improves reset efficiency, and provides a more stable structure.

[0011] Furthermore, the thickness of the gear engaging teeth at one end near the mounting area is greater than the thickness at the other end of the gear engaging teeth. The structure of the limiting groove in the locking area corresponds to the structure of the gear engaging teeth, facilitating separation of the gear engaging teeth from the hinge rotating teeth when the gear is mounted in the mounting area, resulting in a more compact structure, reduced space occupation, and cost savings.

[0012] Furthermore, the locking unit further includes a spring plate, which is disposed between the gear engaging tooth and the stop block. One end of the spring plate located in the locking area protrudes toward one side of the gear engaging tooth, so that the spring plate abuts between the gear engaging tooth and the stop block, resulting in a more stable structural connection and smoother operation.

[0013] Furthermore, the locking units are provided in two groups and are symmetrically arranged along the central axis of the hinge teeth, thereby improving the stability of the hinge teeth rotation and the accuracy of operation, and facilitating the manipulation of the armrest surface.

[0014] Furthermore, the transmission shaft is configured as an external hexagonal screw structure, and a hexagonal inner hole is provided at the center of the hinge gear. The hinge gear is sleeved on the transmission shaft based on the hexagonal inner hole, which is convenient to install and disassemble, has a simple structure and low cost.

[0015] Furthermore, an open elastic pin is fixedly provided at both ends of the transmission shaft, and the other end of the open elastic pin is fixed on the surface support member, so that the armrest member drives the transmission shaft to rotate through the surface support member and the open elastic pin. The structure is simple and the installation and disassembly are convenient.

[0016] A swivel chair comprising any of the three-section intelligent control armrests described above.

[0017] In summary, the beneficial effects of the present invention are:

[0018] The present invention arranges the support member on the main body of the swivel chair, and the height of the armrest member can be adjusted through the support member, the swing member can swing horizontally, and the armrest member can adjust the pitch angle of the armrest surface through the face support member, so as to adapt to the sitting posture requirements of different users and make it more comfortable to use. Moreover, the swing member and the face support member can cooperate to adjust the spatial position of the armrest surface. After the user lies down, the wrist is placed on the armrest surface, which can effectively relieve the stress on the wrist, improve comfort and make adjustment more convenient. Through the cooperation of the locking unit and the hinge rotating teeth, the armrest member can be stopped and stopped during the adjustment process, and the reset spring can achieve automatic reset, which is simple to operate, easy to use and has higher compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of an embodiment of the three-section intelligent control armrest of the present invention.

[0020] Figure 2 It is a structural schematic diagram of an embodiment of the three-section intelligent control armrest of the present invention from another perspective.

[0021] Figure 3 This is a diagram of the usage status of an embodiment of the three-section intelligent control armrest of the present invention.

[0022] Figure 4It is a top view of an embodiment of the three-section intelligent control armrest of the present invention.

[0023] Figure 5 yes Figure 4 Schematic diagram of the cross-sectional structure of AA.

[0024] Figure 6 It is a schematic diagram of the internal structure of an embodiment of the surface support component of the three-section intelligent control armrest of the present invention.

[0025] Figure 7 It is a schematic diagram of the exploded structure of an embodiment of the locking assembly of the three-section intelligent control armrest of the present invention.

[0026] Figure 8 It is a schematic diagram of the exploded structure of an embodiment of the swinging member and the surface supporting member of the three-section intelligent control armrest of the present invention.

[0027] Figure 9 It is a structural schematic diagram of an embodiment of a locking assembly of a three-section intelligent control armrest of the present invention.

[0028] Figure 10 It is a schematic diagram of the internal structure of an embodiment of the locking assembly of the three-section intelligent control armrest of the present invention.

[0029] Figure 11 It is a schematic diagram of the installation structure of the hinge teeth and locking unit of an embodiment of the three-section intelligent control armrest of the present invention.

[0030] Figure 12 This is a schematic diagram of the installation structure of the hinge teeth and locking unit of an embodiment of the three-section intelligent control armrest of the present invention from another perspective.

[0031] Figure 13 It is a schematic diagram of the installation structure of an embodiment of the locking assembly of the three-section intelligent control armrest of the present invention.

[0032] Figure 14 It is a structural schematic diagram of an embodiment of the three-section intelligent control handrail of the present invention without the handrail piece.

[0033] Figure 15 It is a schematic diagram of the internal installation structure of an embodiment of the handrail component of the three-section intelligent control handrail of the present invention.

[0034] Figure 16 It is a structural schematic diagram of an embodiment of the support component of the three-section intelligent control armrest of the present invention.

[0035] Figure 17 1 is a schematic structural diagram of an embodiment of a swivel chair of the present invention.

[0036] Figure 18 It is a schematic structural diagram of a swivel chair in use state according to an embodiment of the present invention.

[0037] Description of reference numerals in the figures:

[0038] 1. Three-section intelligent control armrest; 2. Support member; 3. Swing member; 31. Installation slot; 32. Locking area; 33. Hanging table area; 4. Surface support member; 5. Locking assembly; 51. Transmission shaft; 52. Hinge gear; 521. Groove; 53. Locking unit; 531. Gear engagement tooth; 532. Limit block; 533. Spring clip; 54. Return spring; 55. First chain plate; 56. Second chain plate; 57. Chain box; 58. Limiting slot; 581. Step portion; 59. Opening pin; 6. Armrest member; 61. Armrest surface; 62. Sliding unit; 63. Armrest base; 7. Swivel chair; 71. Main body. DETAILED DESCRIPTION

[0039] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0040] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like to indicate orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0041] In the description of the present invention, if words such as "several" are used, they mean one or more; "more" means two or more; "greater than," "less than," and "exceed" are understood to exclude the number itself; and "above," "below," and "within" are understood to include the number itself. The terms "first," "second," and "third" are used solely to distinguish technical features and are not to be construed as indicating or implying relative importance, or as implicitly specifying the number of the indicated technical features, or as implicitly specifying the order of the indicated technical features.

[0042] The following is combined with Figure 1-18 , the embodiments of the present invention are described in further detail.

[0043] Three-section intelligent control armrest 1, such as Figure 1-7As shown, it includes a support member 2, a swing member 3 hingedly connected to one end of the support member 2, a face support member 4 hingedly connected to the end of the swing member 3 away from the support member 2, a locking assembly 5 for locking the face support member 4, and an armrest member 6 arranged on the face support member 4. The swing member 3 swings horizontally with the end of the support member 2 as the axis, and the locking assembly 5 includes a transmission shaft 51, a hinge tooth 52, a locking unit 53 and a return spring 54. One end of the transmission shaft 51 is arranged through the swing member 3, and the end of the transmission shaft 51 is fixedly connected to the end of the face support member 4. An open mounting groove 31 is provided at the end of the swing member 3, and a locking area 32 and a hanging platform area 33 are adjacently provided in the mounting groove 31. The hinge tooth 52 is located in the mounting groove 31 and is fixed on the transmission shaft 51. The circumferential side of the hinge tooth 52 is meshed with the locking area 32. One end of the return spring 54 is fixedly connected to the interior of the mounting slot 31, and the other end of the return spring 54 is fixedly connected to the face support member 4. When the locking unit 53 is located in the locking area 32, the circumferential side of the hinge teeth 52 engages with the locking area 32. When the locking unit 53 is located in the hanging area 33, the return spring 54, hinge teeth 52, face support member 4, and armrest member 6 return to their initial positions.

[0044] The support member 2 is provided on the main body 71 of the swivel chair 7. The height of the armrest member 6 can be adjusted through the support member 2. The swing member 3 can swing horizontally. The armrest member 6 can adjust the pitch angle of the armrest surface 61 through the face support member 4, so as to adapt to the sitting posture requirements of different users, be more comfortable to use, and have a wider adjustment range. Moreover, the swing member 3 and the face support member 4 can cooperate to adjust the spatial position of the armrest surface 61. After the user lies down, the wrist is placed on the armrest surface 61, which can effectively relieve the stress on the wrist, provide higher comfort, and make adjustment more convenient. Through the cooperation of the locking unit 53 and the hinge gear 52, the armrest member 6 can be stopped and stopped during adjustment, and the reset spring 54 can achieve automatic reset, which is simple to operate, easy to use, and has higher compatibility.

[0045] In some embodiments, as Figure 5-12 As shown, the locking assembly 5 includes a first chain 55 and a second chain 56. The first chain 55 and the second chain 56 are arranged in parallel and spaced apart and fixedly connected by a pin. The locking unit 53 includes a gear engaging tooth 531. The gear engaging tooth 531 is fixed between the first chain 55 and the second chain 56. The end surface of the gear engaging tooth 531 is meshed with the end surface of the hinge rotating tooth 52. The gear engaging tooth 531 is movably arranged between the locking area 32 and the hanging platform area 33 to improve the stability of the structural connection. One tooth corresponds to each gear position, making adjustment convenient.

[0046] Specifically, both the first and second chain links 55 and 56 are provided with limiting slots 58. One side of the limiting slots 58 is provided with a step 581, and the other side of the limiting slots 58 is located in the locking area 32. The two sides of the gear engaging teeth 531 are movably disposed within the corresponding limiting slots 58. The hinge rotating tooth 52 is located between the first and second chain links 55 and 56. A groove 521 is provided around the hinge rotating tooth 52, and the bottom of the groove 521 is provided with teeth that mesh with the gear engaging teeth 531. The side walls of the groove 521 drive the gear engaging teeth 531 to disengage or engage within the step 581, enabling automatic reset and simplifying use.

[0047] Preferably, the locking unit 53 further includes a stopper 532, which is fixed between the first chain 55 and the second chain 56. A guide arc surface is provided on the side of the stopper 532 facing the gear engaging tooth 531. The side of the gear engaging tooth 531 facing away from the hinge rotating tooth 52 is in close contact with the guide arc surface. This ensures a more compact connection between the gear engaging tooth 531 and the hinge rotating tooth 52, guides the movement of the gear engaging tooth 531, improves reset efficiency, and provides a more stable structure.

[0048] The gear engaging teeth 531 are arranged in a fan-shaped configuration, with their inner surfaces also configured as curved surfaces that align with the circumference of the hinge teeth 52. The thickness of the gear engaging teeth 531 at the end closest to the mounting area 33 is greater than that at the other end. The retaining grooves 58 located in the locking area 32 correspond to the structure of the gear engaging teeth 531, facilitating separation of the gear engaging teeth 531 from the hinge teeth 52 when the gear is mounted in the mounting area 33. This results in a more compact structure, reduced space, and cost savings.

[0049] Preferably, to ensure that the gear engaging tooth 531 and the hinge rotating tooth 52 are meshed and elastically connected, and to facilitate rotation while also keeping the gear engaging tooth 531 in close contact with the hinge rotating tooth 52, the locking unit 53 also includes a spring plate 533 disposed between the gear engaging tooth 531 and the stop block 532. One end of the spring plate 533, located in the locking area 32, protrudes toward one side of the gear engaging tooth 531, so that the spring plate 533 abuts between the gear engaging tooth 531 and the stop block 532, resulting in a more stable structural connection and smoother operation.

[0050] In this embodiment, if Figure 5-12 As shown, the locking units 53 are provided in two groups and are symmetrically arranged along the central axis of the hinge rotating teeth 52 , thereby improving the rotation stability and operation accuracy of the hinge rotating teeth 52 and facilitating the manipulation of the armrest surface 61 .

[0051] The locking assembly 5 also includes a chain box 57, which is located within the mounting slot 31 and facilitates assembly of the locking unit 53, the first chain piece 55, and the second chain piece 56. The chain box 57, the first chain piece 55, the second chain piece 56, and the stop block 532 are all connected by pins. The end of one of the pins protrudes from the chain box 57, facilitating the securing of the end of the return spring 54 to the pin. This allows the return spring 54 to drive the armrest 6 back to its original position during resetting.

[0052] The first and second chain links 55 and 56 are configured as L-shaped structures, with the L-shaped structures having an obtuse angle. A set of locking units 53 is provided at each end of the first chain link 55, with each set of locking units 53 corresponding to a groove 521, thereby increasing the swing amplitude and making the structure more compact.

[0053] In some embodiments, as Figure 8-9 As shown, the transmission shaft 51 is configured as an external hexagonal screw structure, and a hexagonal inner hole is provided at the center of the hinge tooth 52. The hinge tooth 52 is sleeved on the transmission shaft 51 based on the hexagonal inner hole, which is convenient to install and disassemble, has a simple structure and low cost.

[0054] Preferably, each end of the transmission shaft 51 is fixed with an open spring pin 59. The other end of the open spring pin 59 is fixed to the face support member 4. This allows the armrest member 6 to rotate the transmission shaft 51 through the face support member 4 and the open spring pin 59. This simple structure makes installation and removal easy. Specifically, each end of the transmission shaft 51 is provided with a socket, and each open spring pin 59 corresponds to and is fixed in one socket. The other end of the open spring pin 59 is inserted into the corresponding socket slot of the face support member 4, making assembly very convenient.

[0055] like Figure 14-16 As shown, the armrest 6 includes an armrest surface 61, a sliding unit 62, and an armrest base 63. The armrest surface 61 can slide along the armrest surface 61 base via the sliding unit 62, thereby further increasing the adjustment range of the armrest surface 61. The armrest support 4 is screwed to the armrest base 63.

[0056] The user grasps the front end of the PU armrest surface 61 on the armrest member 6 and lifts the attached face support member 4 upward. The drive shaft 51 passing through the face support member 4 drives the hinge teeth 52 to rotate. As the hinge teeth 52 rotate, they engage with the upper and lower gear engaging teeth 531. The gear engaging teeth 531 reciprocate and engage along a bilaterally symmetrical path along the hinge teeth 52. When the armrest surface 61 is adjusted to the desired angle, the PU armrest surface 61 is released. Under the tension of the return spring 54, the armrest member 6 and face support member 4 tend to rotate downward. At this point, the gear engaging teeth 531 engage the hinge teeth 52 at a fixed angle.

[0057] When the armrest surface 61 rotates upward through all the teeth, the gear engaging teeth 531 are triggered to enter the reset phase, retreating to the platform area 33 and securing there. At this point, the gear engaging teeth 531 are suspended relative to the hinge teeth 52 by the action of the step 581, allowing the armrest surface 61 to rotate to its maximum angle. When the armrest surface 61 is released, the elastic restoring force of the return spring 54 pulls the armrest 6 and the support 4 back to their initial positions.

[0058] Specifically, when the armrest surface 61 rotates to its maximum angle, the sidewall of the recess 521 of the hinge tooth 52, located at the thinner end of the gear engaging tooth 531, rotates clockwise, pushing the gear engaging tooth 531 onto the mounting area 33, causing the gear engaging tooth 531 to separate from the hinge tooth 52 and become stuck on the mounting area 33. At this point, the return spring 54 is in a stretched state, and the armrest surface 61 rotates to its highest point. The armrest 6 then reverses and resets under the elastic restorative action of the return spring 54, driving the surface support 4, the transmission shaft 51, and the hinge tooth 52 thereon to rotate counterclockwise. When the sidewall on the other side of the groove 521 of the hinge rotating tooth 52 contacts the thicker end of the gear engaging tooth 531, the hinge rotating tooth 52, under the pulling force of the return spring 54, pushes the gear engaging tooth 531 out of the hanging area 33 and drives the gear engaging tooth 531 to rotate counterclockwise until the gear engaging tooth 531 and the hinge rotating tooth 52 are in meshing state and the gear engaging tooth 531 is disengaged from the hanging area 33. At this time, the armrest member 6, the face support member 4, the return spring 54, the gear engaging tooth 531, and the hinge rotating tooth 52 all return to their initial positions.

[0059] Swivel chair 7, such as Figure 17-18 As shown, it includes any of the three-section intelligent control armrests 1 described above. Two sets of any of the three-section intelligent control armrests 1 described above are installed on the body 71 of the swivel chair 7. The height of the armrest surface 61 can be adjusted by adjusting the support member 2, the swing member 3, and the armrest member 6, making it more convenient to use, with a wider adjustment range and higher comfort.

[0060] The examples of this specific embodiment are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, any equivalent changes made based on the structure, shape, and principle of this application should be included in the scope of protection of this application.

Claims

1. Three-section intelligent control armrest, characterized by: The invention comprises a support member (2), a swing member (3) hingedly connected to one end of the support member (2), a face support member (4) hingedly connected to one end of the swing member (3) away from the support member (2), a locking assembly (5) for locking the face support member (4), and an armrest member (6) arranged on the face support member (4); the swing member (3) swings horizontally with the end of the support member (2) as the axis, and the locking assembly (5) comprises a transmission shaft (51), a hinge tooth (52), a locking unit (53) and a return spring (54); one end of the transmission shaft (51) passes through the swing member (3) and is arranged The end of the transmission shaft (51) is fixedly connected to the end of the surface support member (4); an open mounting groove (31) is provided at the end of the swing member (3), and a locking area (32) and a hanging area (33) are adjacently provided in the mounting groove (31); the hinge rotating tooth (52) is located in the mounting groove (31) and is fixed on the transmission shaft (51); the circumferential side of the hinge rotating tooth (52) is meshedly connected to the locking area (32); one end of the return spring (54) is fixedly connected to the inside of the mounting groove (31), and the other end of the return spring (54) is fixedly connected to the surface support member (4); When the locking unit (53) is located in the locking area (32), the circumferential side of the hinge tooth (52) is meshed and connected with the locking area (32); when the locking unit (53) is located in the hanging platform area (33), the return spring (54), the hinge tooth (52), the surface support member (4) and the armrest member (6) return to their initial positions.

2. The three-section intelligent control armrest according to claim 1, characterized in that: The locking assembly (5) comprises a first chain plate (55) and a second chain plate (56); the first chain plate (55) and the second chain plate (56) are arranged in parallel and spaced apart and fixedly connected by a pin; the locking unit (53) comprises a gear engaging tooth (531), the gear engaging tooth (531) is fixed between the first chain plate (55) and the second chain plate (56), the end surface of the gear engaging tooth (531) is meshedly connected with the end surface of the hinge rotating tooth (52), and the gear engaging tooth (531) is movably arranged in the locking area (32) and the hanging platform area (33).

3. The three-section intelligent control armrest according to claim 2 is characterized in that: The first chain plate (55) and the second chain plate (56) are both provided with a limiting groove (58), and the limiting groove (58) is located on one side of the hanging platform area (33) and is provided with a step portion (581), and the other side of the limiting groove (58) is located in the locking area (32); the two sides of the gear engaging tooth (531) are respectively movably arranged in the corresponding limiting groove (58); the circumferential side of the hinge rotating tooth (52) is provided with a groove (521), and the groove bottom of the groove (521) is provided with teeth meshing with the gear engaging tooth (531); the two side walls of the groove (521) are used to drive the gear engaging tooth (531) to disengage or be stuck in the step portion (581).

4. The three-section intelligent control armrest according to claim 3 is characterized in that: The locking unit (53) further comprises a limit block (532), wherein the limit block (532) is fixed between the first chain plate (55) and the second chain plate (56), and a guide arc surface is provided on a side of the limit block (532) facing the gear engaging tooth (531), and a side of the gear engaging tooth (531) facing away from the hinge rotating tooth (52) is closely attached to the guide arc surface.

5. The three-section intelligent control armrest according to claim 4 is characterized in that: The thickness of one end of the gear engaging tooth (531) close to the hanging platform area (33) is greater than the thickness of the other end of the gear engaging tooth (531); the structure of the limiting groove (58) located in the locking area (32) is arranged corresponding to the structure of the gear engaging tooth (531).

6. The three-section intelligent control armrest according to claim 5, characterized in that: The locking unit (53) further comprises a spring sheet (533), wherein the spring sheet (533) is arranged between the gear engaging tooth (531) and the limiting block (532); one end of the spring sheet (533) located in the locking area (32) is protruded toward one side of the gear engaging tooth (531), so that the spring sheet (533) abuts between the gear engaging tooth (531) and the limiting block (532).

7. The three-section intelligent control armrest according to claim 1, characterized in that: The locking units (53) are provided in two groups and are symmetrically arranged along the central axis of the hinge rotating tooth (52).

8. The three-section intelligent control armrest according to claim 1, characterized in that: The transmission shaft (51) is configured as an external hexagonal screw structure, a hexagonal inner hole is provided at the center of the hinge rotating tooth (52), and the hinge rotating tooth (52) is sleeved on the transmission shaft (51) based on the hexagonal inner hole.

9. The three-section intelligent control armrest according to claim 8, characterized in that: An opening elastic pin (59) is fixedly provided at both ends of the transmission shaft (51), and the other end of the opening elastic pin (59) is fixed on the surface support member (4), so that the armrest member (6) drives the transmission shaft (51) to rotate through the surface support member (4) and the opening elastic pin (59).

10. A swivel chair, characterized in that: Including the three-section intelligent control armrest described in any one of claims 1-9.

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