Angle-controllable self-locking structure and three-section intelligent control handrail thereof

Abstract

The utility model relates to the technical field of seats, in particular to an angle-controllable self-locking structure and a three-section intelligent control armrest thereof, and the angle-controllable self-locking structure comprises a swinging piece, a face supporting piece and a locking assembly. 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 swing part can swing horizontally, the angle between the face supporting part and the swing part can be adjusted, the locking assembly can fix the face supporting part and the swing part with any angle adjustment, the structure is more stable, and use is more convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to chair technical field especially angle controllable self -locking structure and its three section intelligent control handrails. BACKGROUND

[0002] The spatial position of the existing office chair handrail is relatively fixed in height, but in actual application, the body types of each person are different, so the requirements of height, level and handrail distance of the handrail are different, even the same person has different requirements for the position of the chair handrail in different postures or occasions, and long sitting on the chair with fixed handrails can cause the muscles, ligaments, fascia, joint capsules and other soft tissues of the user to be in a tense state, and the muscles of the shoulder are fatigued and exceed the physiological load, so relieving the above hazards has become an important research topic of health organizations or related enterprises, therefore, the adjustable chair handrail according to the needs of the user emerges as the times require.

[0003] The existing handrail can be lifted and horizontally rotated and adjusted, but when the user leans on the swivel chair to look at data or other things, the arm can only be placed on the handrail, and the elbow still needs to bear a large weight, and after a long time, the elbow is prone to pain and is inconvenient to use. CONTENT OF THE UTILITY MODEL

[0004] In order to solve the technical defects in the background art, the utility model aims at providing an angle controllable self -locking structure and its three section intelligent control handrails.

[0005] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0006] The angle controllable self -locking structure and its three section intelligent control handrails comprise a swing piece, a face support connected to one end of the swing piece and a locking assembly, the locking assembly comprises a transmission shaft, a hinge gear, a locking unit and a return spring, one end of the transmission shaft penetrates through the swing piece and is arranged, the end of the transmission shaft is fixedly connected with the end of the face support, the end of the swing piece is provided with an open mounting groove, the locking area and the hanging table area are arranged adjacent in the mounting groove, the hinge gear is located in the mounting groove and is fixed on the transmission shaft, the hinge gear is meshed and connected with the locking area, one end of the return spring is fixedly connected in the mounting groove, the other end of the return spring is fixedly connected on the face support, when the locking unit is located in the locking area, the circumferential side of the hinge gear is meshed and connected with the locking area, when the locking unit is located in the hanging table area, the return spring, the hinge gear and the face support return to the initial position.

[0007] By adopting the technical scheme, the support member is arranged on the body of the swivel chair, the height of the armrest member can be adjusted through the support member, the swing member can swing horizontally, the armrest surface can be adjusted in the pitch angle through the face support member, so as to adapt to the sitting posture requirements of different users and use more comfortably. 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, the stress condition of the wrist can be effectively relieved, the comfort degree is higher, and the adjustment is more convenient. Through the cooperation of the stop unit and the hinge rotating tooth, the armrest member can be stopped during the adjustment process, and the reset spring can realize automatic reset, so that the operation is simple, the use is convenient, and the compatibility is higher.

[0008] Further, the locking assembly includes a first chain piece and a second chain piece. The first chain piece and the second chain piece are arranged in parallel and are fixedly connected by a pin. The stop unit includes a gear engaging tooth, which is fixed between the first chain piece and the second chain piece, and the end face of the gear engaging tooth is in meshing connection with the end face of the hinge rotating tooth. The gear engaging tooth is movably arranged between the stop area and the hanging table area, which can improve the stability of the structure connection, one tooth corresponds to one gear, and the adjustment is convenient.

[0009] Further, the first chain piece and the second chain piece are provided with a limiting groove, and the limiting groove is provided with a step portion on one side of the hanging table area, and the other side of the limiting groove is located in the stop area. The two sides of the gear engaging tooth are movably arranged in the corresponding limiting grooves. The hinge rotating tooth is provided with a groove on the circumferential side, and the groove bottom is provided with a tooth that is in meshing connection with the gear engaging tooth. The two side walls of the groove can drive the gear engaging tooth to disengage or be clamped in the step portion, so that automatic reset can be realized, and the use is simpler and more convenient.

[0010] Further, the stop unit further includes a limiting block, which is fixed between the first chain piece and the second chain piece. One side of the limiting block facing the gear engaging tooth is provided with a guide arc surface, and the other side of the gear engaging tooth away from the hinge rotating tooth is close to the guide arc surface, so that the gear engaging tooth and the hinge rotating tooth are connected more compactly, the movement of the gear engaging tooth can be guided, the reset efficiency is improved, and the structure is more stable.

[0011] Further, the thickness of one end of the gear engaging tooth close to the hanging table area is greater than the thickness of the other end of the gear engaging tooth. The structure of the limiting groove in the stop area is correspondingly arranged with the structure of the gear engaging tooth, so that the gear engaging tooth and the hinge rotating tooth can be separated in the hanging table area, the structure is more compact, the occupied space is reduced, and the cost is saved.

[0012] Further, the stop unit further comprises an elastic sheet, which is arranged between the gear engaging tooth and the limiting block.

[0013] Further, the stop unit is arranged in two groups and symmetrically arranged along the central axis of the hinge gear, thereby improving the stability of rotation of the hinge gear and the precision of operation.

[0014] Further, the transmission shaft is arranged as an outer hexagonal screw structure, the center of the hinge gear is provided with a hexagonal inner hole, and the hinge gear is sleeved on the transmission shaft based on the hexagonal inner hole, thereby achieving convenient installation and removal, simple structure and low cost.

[0015] Further, the transmission shaft is arranged as an outer hexagonal screw structure, the center of the hinge gear is provided with a hexagonal inner hole, and the hinge gear is sleeved on the transmission shaft based on the hexagonal inner hole, thereby achieving convenient installation and removal, simple structure and low cost.

[0016] The three-section intelligent control handrail comprises the angle-controllable self-locking structure, a support connected to the angle-controllable self-locking structure, and a handrail member connected to the other end of the angle-controllable self-locking structure.

[0017] In summary, the three-section intelligent control handrail has the following advantages:

[0018] The support is arranged on the body of the swivel chair, the height of the handrail member can be adjusted through the support, the swing member can swing horizontally, the handrail member can adjust the pitch angle of the handrail surface through the face support, so as to adapt to the sitting posture requirements of different users and use more comfortably. Moreover, the swing member and the face support can cooperate to adjust the spatial position of the handrail surface, after the user lies down, the wrist is placed on the handrail surface, the stress condition of the wrist can be effectively relieved, the comfort degree is higher, and the adjustment is more convenient. Through cooperation of the stop unit and the hinge gear, the handrail member can be stopped during adjustment, the reset spring can realize automatic reset, the operation is simple, the use is convenient, and the compatibility is higher. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of an embodiment of the three-section intelligent control handrail of the utility model.

[0020] Figure 2 is a structural schematic view of another view of an embodiment of the three-section intelligent control handrail of the utility model.

[0021] Figure 3is the use state diagram of one embodiment of the three-section intelligent control handrail of the utility model.

[0022] Figure 4 is the top view of one embodiment of the three-section intelligent control handrail of the utility model.

[0023] Figure 5 is Figure 4 is the section structure schematic view of A-A in the middle.

[0024] Figure 6 is the internal structure schematic view of one embodiment of the surface support of the three-section intelligent control handrail of the utility model.

[0025] Figure 7 is the explosion structure schematic view of one embodiment of the locking assembly of the angle controllable self-locking structure of the utility model.

[0026] Figure 8 is the explosion structure schematic view of one embodiment of the angle controllable self-locking structure of the utility model.

[0027] Figure 9 is the structure schematic view of one embodiment of the locking assembly of the angle controllable self-locking structure of the utility model.

[0028] Figure 10 is the internal structure schematic view of one embodiment of the locking assembly of the angle controllable self-locking structure of the utility model.

[0029] Figure 11 is the installation structure schematic view of one embodiment of the hinge rotating tooth and the stop locking unit of the angle controllable self-locking structure of the utility model.

[0030] Figure 12 is the installation structure schematic view of one embodiment of the hinge rotating tooth and the stop locking unit of the angle controllable self-locking structure of the utility model from another view.

[0031] Figure 13 is the installation structure schematic view of one embodiment of the locking assembly of the angle controllable self-locking structure of the utility model.

[0032] Figure 14 is the structure schematic view of one embodiment of the three-section intelligent control handrail of the utility model removing the handrail.

[0033] Figure 15 is the internal installation structure schematic view of one embodiment of the handrail of the three-section intelligent control handrail of the utility model.

[0034] Figure 16 is the structure schematic view of one embodiment of the support of the three-section intelligent control handrail of the utility model.

[0035] Figure 17is a structural schematic view of an embodiment of the swivel chair of the utility model.

[0036] Figure 18 is a use state structural schematic view of an embodiment of the swivel chair of the utility model.

[0037] The reference signs in the drawings are explained as follows:

[0038] 1, three section intelligent control handrails; 2, support; 3, swing piece; 31, installation groove; 32, lock area; 33, hanging platform area; 4, face support; 5, locking assembly; 51, transmission shaft; 52, hinge gear; 521, groove; 53, lock unit; 531, gear engaging tooth; 532, limit block; 533, elastic sheet; 54, reset spring; 55, first chain sheet; 56, second chain sheet; 57, chain box; 58, limit groove; 581, step part; 59, opening elastic pin; 6, handrail; 61, handrail surface; 62, sliding unit; 63, handrail base; 7, swivel chair; 71, body. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art belong to the scope of protection of the utility model.

[0040] Those skilled in the art should understand that, in the disclosure of the utility model, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore the above terms cannot be understood as a limitation on the utility model.

[0041] In the description of the utility model, if there is a word such as "several" or the like, the meaning is one or more, the meaning of more than two, greater than, less than, more than, etc. is not included in the number, above, below, within, etc. is understood as including the number. If the first, second, third is described, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.

[0042] The following will be combined with the drawings of the embodiments of the utility model Figures 1-18 The embodiments of the utility model will be further described in detail.

[0043] The angle-controllable self-locking structure, as shown in Figures 1-7 includes a swing member 3, a face support 4 hingedly connected to one end of the swing member 3, and a locking assembly 5 for locking the face support 4. The locking assembly 5 includes a transmission shaft 51, a hinge gear 52, a locking unit 53, and a return spring 54. One end of the transmission shaft 51 penetrates through the swing member 3 and is fixedly connected to an end of the face support 4. An open mounting groove 31 is arranged at an end of the swing member 3, and a locking area 32 and a hanging platform area 33 are arranged adjacent to each other in the mounting groove 31. The hinge gear 52 is located in the mounting groove 31 and is fixed to the transmission shaft 51. The circumferential side of the hinge gear 52 is in meshing connection with 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 face support 4. When the locking unit 53 is located in the locking area 32, the circumferential side of the hinge gear 52 is in meshing connection with the locking area 32. When the locking unit 53 is located in the hanging platform area 33, the return spring 54, the hinge gear 52, and the face support 4 return to the initial position. The swing member 3 can swing horizontally, the angle between the face support 4 and the swing member 3 can be adjusted, the locking assembly 5 can fix the face support 4 and the swing member 3 at any angle adjusted, the structure is more stable, the use is more convenient, and the compatibility is stronger.

[0044] In some embodiments, as shown in Figures 5-12 the locking assembly 5 includes a first chain piece 55 and a second chain piece 56. The first chain piece 55 and the second chain piece 56 are arranged in parallel and are fixedly connected by a pin. The locking unit 53 includes a gear engaging tooth 531, which is fixed between the first chain piece 55 and the second chain piece 56, the end face of the gear engaging tooth 531 is in meshing connection with the end face of the hinge gear 52, and the gear engaging tooth 531 is movably arranged in the locking area 32 and the hanging platform area 33. The stability of the structure connection can be improved, one tooth corresponds to one gear, and the adjustment is convenient.

[0045] Specifically, a limiting groove 58 is arranged on each of the first chain piece 55 and the second chain piece 56, the limiting groove 58 is provided with a stepped portion 581 on one side of the hanging platform area 33, 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 movably arranged in the corresponding limiting grooves 58. The hinge gear 52 is located between the first chain piece 55 and the second chain piece 56, the circumferential side of the hinge gear 52 is provided with a groove 521, and the groove bottom of the groove 521 is provided with tooth gears in meshing connection with the gear engaging tooth 531. The two side walls of the groove 521 drive the gear engaging tooth 531 to disengage or be clamped in the stepped portion 581, so that automatic resetting can be realized, and the use is more simple and convenient.

[0046] Preferably, the locking unit 53 further comprises a limiting block 532 fixed between the first chain piece 55 and the second chain piece 56. The limiting block 532 is provided with a guide arc surface on the side facing the gear engaging tooth 531, and the gear engaging tooth 531 abuts against the guide arc surface on the side away from the hinge rotating tooth 52, so that the gear engaging tooth 531 is connected more compactly with the hinge rotating tooth 52, and the movement of the gear engaging tooth 531 can be guided, the resetting efficiency is improved, and the structure is more stable.

[0047] The gear engaging tooth 531 is provided in a fan shape, and the inner side surface of the gear engaging tooth 531 is also provided as an arc surface matching the peripheral side of the hinge rotating tooth 52. The thickness of the 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 limiting groove 58 is provided in the structure of the locking area 32 corresponding to the structure of the gear engaging tooth 531, so as to facilitate the separation of the gear engaging tooth 531 from the hinge rotating tooth 52 when the hanging platform area 33, the structure is more compact, reduces the occupied space, and saves the cost.

[0048] Preferably, in order to make the gear engaging tooth 531 mesh with and elastically contact the hinge rotating tooth 52, facilitate rotation, and also keep the gear engaging tooth 531 abutting against the hinge rotating tooth 52 at any time. The locking unit 53 further comprises a spring piece 533 provided between the gear engaging tooth 531 and the limiting block 532. The spring piece 533 is protrudingly provided on the side of one end of the locking unit 53 towards the gear engaging tooth 531, so as to abut against the gear engaging tooth 531 and the limiting block 532, the structure is more stable, and the use and operation are more smooth.

[0049] In the embodiment, as shown in Figures 5-12 The locking unit 53 is provided with two groups and is symmetrically provided along the central axis of the hinge rotating tooth 52, so as to improve the stability of rotation and the precision of operation of the hinge rotating tooth 52, and facilitate the control of the face supporting piece 4.

[0050] The locking assembly 5 further comprises a chain box 57 located in the mounting groove 31, so as to facilitate the 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 limiting block 532 are connected by a pin. The end of one pin protrudes from the chain box 57, so as to facilitate the fixation of the end of the resetting spring 54 on the pin, so that the resetting spring 54 can drive the face supporting piece 4 to reset when resetting.

[0051] The first chain piece 55 and the second chain piece 56 are provided in an L-shaped structure, and the included angle of the L-shaped structure is an obtuse angle. The two ends of the first chain piece 55 are each provided with a group of locking units 53, and each group of locking units 53 corresponds to a recess 521, so as to improve the swing amplitude and make the structure more compact.

[0052] In some embodiments, such as Figures 8-9 As shown, the drive shaft 51 is configured as an external hexagonal screw structure, and the hinge tooth 52 has a hexagonal inner hole at its center. The hinge tooth 52 is fitted onto the drive shaft 51 based on the hexagonal inner hole, which makes installation and disassembly convenient, the structure simple, and the cost low.

[0053] Preferably, each end of the drive shaft 51 is fixedly provided with an open spring pin 59, and the other end of the open spring pin 59 is fixed to the face support 4, so that the armrest 6 drives the drive shaft 51 to rotate through the face support 4 and the open spring pin 59. The structure is simple and easy to install and disassemble. Specifically, each end of the drive shaft 51 is provided with a plug hole, and each open spring pin 59 corresponds to a plug hole and is fixed in the plug hole. The other end of the open spring pin 59 is inserted into the corresponding plug slot of the face support 4, making assembly very convenient.

[0054] Three-section intelligent control handrail, such as Figures 1-6 As shown, it includes any of the angle-controllable self-locking structures described above, a support member 2 connected to the angle-controllable self-locking structure, and a handrail member 6 connected to the other end of the angle-controllable self-locking structure.

[0055] Specifically, the support member 2 is hinged to the end of the swing member 3 away from the face support member 4, so that the swing member 3 can be adjusted horizontally. The handrail member 6 is fixed to the end of the face support member 4 away from the swing member 3.

[0056] like Figures 14-16 As shown, the armrest component 6 includes an armrest surface 61, a sliding unit 62, and an armrest base 63. The armrest surface 61 can slide along the base of the armrest surface 61 via the sliding unit 62, which facilitates further improvement of the adjustment range of the armrest surface 61. The support component 4 is screwed to the armrest base 63.

[0057] Preferably, the support member 2 and the swing member 3 are hinged to allow the swing member 3 to be adjusted horizontally, which can improve the adjustment range and increase compatibility.

[0058] like Figures 17-18 As shown, the main body 71 of the swivel chair 7 is equipped with two sets of three-section intelligent control armrests 1, any one of the above-mentioned types. 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.

[0059] The support 2 is arranged on the body 71 of the swivel chair 7, the height of the armrest 6 can be adjusted through the support 2, the swing piece 3 can swing horizontally, the armrest surface 61 can be adjusted in the pitch angle through the face support 4, so as to adapt to the sitting posture requirements of different users, use more comfortable, and the adjustment range is wider. Moreover, the swing piece 3 and the face support 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, the stress condition of the wrist can be effectively relieved, the comfort is higher, and the adjustment is more convenient. Through the cooperation of the locking unit 53 and the hinge gear teeth 52, the armrest 6 can be stopped during the adjustment process, and the reset spring 54 can realize automatic reset, simple operation, convenient use, and higher compatibility.

[0060] The user holds the front end of the PU armrest surface 61 on the armrest 6, lifts the face support 4 connected together upwards, the transmission shaft 51 passing through the face support 4 can drive the hinge gear teeth 52 to rotate, the hinge gear teeth 52 rotates and engages with the upper and lower gear engagement teeth 531 to drive, the gear engagement teeth 531 retreats and engages along the symmetrical path of the hinge gear teeth 52. When the armrest surface 61 is adjusted to the required angle, the PU armrest surface 61 is released, under the action of the pulling force of the reset spring 54, the armrest 6 and the face support 4 have a tendency to rotate downwards, at this time, the gear engagement teeth 531 engages with the hinge gear teeth 52 at a fixed angle.

[0061] When the armrest surface 61 rotates upwards and passes all the teeth, the gear engagement teeth 531 will trigger the reset process, the gear engagement teeth 531 retreats to the hanging table area 33 and is fixed. At this time, under the action of the step part 581, the gear engagement teeth 531 is suspended relative to the hinge gear teeth 52, and the armrest surface 61 rotates to the maximum angle. After the armrest surface 61 is released, under the action of the elastic restoring force, the reset spring 54 will pull the armrest 6 and the face support 4 to restore to the initial state.

[0062] Specifically, when the armrest surface 61 rotates to the maximum angle, the recess 521 of the hinge gear tooth 52 is located at the side wall of the smaller thickness end of the gear engaging tooth 531. The clockwise rotation of the side wall pushes the gear engaging tooth 531 to the hanging platform area 33, so that the gear engaging tooth 531 is separated from the hinge gear tooth 52, and the gear engaging tooth 531 is clamped on the hanging platform area 33. At this time, the return spring 54 is in a stretched state, and the armrest surface 61 rotates to the highest point. Then, the armrest 6 is reversed under the elastic recovery action of the return spring 54, and the armrest 6 drives the surface holder 4, the transmission shaft 51 and the hinge gear tooth 52 thereon to rotate counterclockwise. When the other side wall of the recess 521 of the hinge gear tooth 52 contacts the thick end of the gear engaging tooth 531, the hinge gear tooth 52 pushes the gear engaging tooth 531 out of the hanging platform area 33 under the driving action of the tension of the return spring 54, and drives the gear engaging tooth 531 to rotate counterclockwise until the gear engaging tooth 531 is in meshing state with the hinge gear tooth 52, and the gear engaging tooth 531 is separated from the hanging platform area 33. At this time, the armrest 6, the surface holder 4, the return spring 54, the gear engaging tooth 531 and the hinge gear tooth 52 all return to the initial position.

[0063] The embodiments of the specific embodiment are the preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, wherein the same parts are indicated by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape and principle of the present application should be covered within the protection scope of the present application.

Claims

1. An angle-controllable self-locking structure, characterized in that, The utility model provides a face support (4) and locking assembly (5) are connected to one end of swing piece (3), including swing piece (3), the locking assembly (5) includes transmission shaft (51), hinge gear (52), lock unit (53) and return spring (54), one end of transmission shaft (51) is arranged through swing piece (3), and the end of transmission shaft (51) is fixedly connected with the end of face support (4), and the end of swing piece (3) is provided with open installation groove (31), and the adjacent lock area (32) and hanging platform area (33) are arranged in installation groove (31), hinge gear (52) is located in installation groove (31) and is fixed on transmission shaft (51), hinge gear (52) is engagedly connected with lock area (32), one end of return spring (54) is fixedly connected in installation groove (31), and the other end of return spring (54) is fixedly connected on face support (4), when lock unit (53) is located in lock area (32), the circumferential side of hinge gear (52) is engagedly connected with lock area (32), when lock unit (53) is located in hanging platform area (33), return spring (54), hinge gear (52), face support (4) return to initial position.

2. The angle-controllable self-locking structure according to claim 1, characterized in that, The locking assembly (5) includes first chain piece (55) and second chain piece (56); The first chain piece (55) and the second chain piece (56) are arranged in parallel and are fixedly connected by a pin; The lock unit (53) includes a gear tooth (531), the gear tooth (531) is fixed between the first chain piece (55) and the second chain piece (56), the end face of the gear tooth (531) is engagedly connected with the end face of the hinge gear (52), and the gear tooth (531) is movably arranged in the lock area (32) and the hanging platform area (33).

3. The angle-controllable self-locking structure according to claim 2, characterized in that, The first chain piece (55) and the second chain piece (56) are provided with a limiting groove (58), one side of the limiting groove (58) in the hanging platform area (33) is provided with a stepped portion (581), and the other side of the limiting groove (58) is located in the lock area (32); The two sides of the gear tooth (531) are movably arranged in the corresponding limiting groove (58); The circumferential side of the hinge gear (52) is provided with a groove (521), the groove bottom of the groove (521) is provided with a tooth that is engagedly connected with the gear tooth (531); The two side walls of the groove (521) drive the gear tooth (531) to be separated or clamped in the stepped portion (581).

4. The angle-controllable self-locking structure according to claim 3, characterized in that, The lock unit (53) further includes a limiting block (532), the limiting block (532) is fixed between the first chain piece (55) and the second chain piece (56), one side of the limiting block (532) facing the gear tooth (531) is provided with a guide arc surface, and the side of the gear tooth (531) away from the hinge gear (52) is close to the guide arc surface.

5. The angle-controllable self-locking structure according to claim 4, characterized in that, The thickness of the gear engagement tooth (531) near one end of the hanging platform area (33) is greater than the thickness of the other end of the gear engagement tooth (531); the limiting groove (58) is located in the structure of the locking area (32) and is arranged corresponding to the structure of the gear engagement tooth (531).

6. The angle-controllable self-locking structure according to claim 5, characterized in that, The locking unit (53) further comprises a spring sheet (533), which is arranged between the gear engagement tooth (531) and the limiting block (532); the spring sheet (533) is protrudingly arranged at one end of the locking area (32) towards one side of the gear engagement tooth (531), so that the spring sheet (533) is abutted between the gear engagement tooth (531) and the limiting block (532).

7. The angle-controllable self-locking structure according to claim 1, wherein The locking unit (53) is provided in two groups and is symmetrically arranged along the central axis of the hinge rotating tooth (52).

8. The angle-controllable self-locking structure according to claim 1, wherein, The transmission shaft (51) is provided as an outer hexagonal screw structure, the center of the hinge rotating tooth (52) is provided with a hexagonal inner hole, and the hinge rotating tooth (52) is sleeved on the transmission shaft (51) based on the hexagonal inner hole.

9. The angle-controllable self-locking structure according to claim 1, wherein, Both ends of the transmission shaft (51) are fixedly provided with an open spring pin (59), the other end of the open spring pin (59) is fixed to the face supporting member (4), and the face supporting member (4) drives the transmission shaft (51) to rotate through the open spring pin (59).

10. A three-section smart armrest, characterized in that The angle-controllable self-locking structure, the support member (2) connected to the angle-controllable self-locking structure, and the handrail member (6) connected to the other end of the angle-controllable self-locking structure.

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