Telescopic adjustment mechanism and wearable device

Abstract

The application discloses a telescopic adjusting mechanism and a wearable device. The telescopic adjusting mechanism comprises a mounting carrier, a first adjusting assembly and a second adjusting assembly. The first adjusting assembly comprises a driving gear, two driven racks and a first elastic member. The driving gear is rotatably arranged on the mounting carrier. The two driven racks are respectively engaged with two sides of the driving gear. The first elastic member is arranged between the mounting carrier and the driving gear. The second adjusting assembly comprises an adjusting knob and a transmission structure. The adjusting knob is rotatably arranged on the mounting carrier. When the adjusting knob rotates in a first direction, the adjusting knob can drive the transmission structure to conduct transmission to the driving gear and lock the rotation of the driving gear in a second direction. When the adjusting knob rotates in the second direction, the adjusting knob can drive the transmission structure to block the transmission to the driving gear and release the lock of the rotation of the driving gear in the second direction. The technical scheme of the application can improve the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of head-mounted devices, and in particular to a telescopic adjustment mechanism and a wearable device using the telescopic adjustment mechanism. Background Art

[0002] At present, in order to adapt to the wearing of different users, some wearable devices such as AR products and VR products will use a telescopic adjustment mechanism to adjust the two straps. In the related art, the telescopic adjustment mechanism of the wearable device usually includes an adjustment knob, a driving gear, a driven rack connected to the two straps or directly set on the straps, a stop pawl for one-way stopping the driving gear, and an unlocking paddle. At this time, by driving the adjustment knob to rotate in one direction (which can be defined as clockwise), the two straps can be driven to move closer to each other and shrink through the transmission of the driving gear and the two driven racks; after the two straps are adjusted into place, the stop pawl will abut the driving gear to limit the position, thereby achieving relative limit fixation of the two straps to complete the wearing of the wearable device. When the wearable device needs to be removed, the unlocking paddle is driven to move the locking pawl away from the driving gear, thereby releasing the locking pawl from the driving gear, and then the adjusting knob can be driven to rotate in the other direction (which can be defined as counterclockwise) to drive the two straps to move away from each other and extend, thereby achieving the removal of the wearable device.

[0003] However, in actual use of the aforementioned telescopic adjustment mechanism, the driving gear is restrained by the stop pawl, preventing it from rotating in a single, clockwise direction. Consequently, the two corresponding driven racks can only be driven by the driving gear. This means that when a user wishes to wear the device, they can only adjust the two straps into position by repeatedly turning the adjustment knob. Furthermore, the distance the two straps can move, driven by the driving gear and the driven rack, with each rotation of the adjustment knob is limited. This results in a long time required for the user to adjust the straps into position by turning the adjustment knob. In particular, when the combined wearable size of the two straps is smaller than the desired size, the user must first move the unlocking paddle to move the stop pawl away from the driving gear, releasing the stop pawl from locking the driving gear. Only then can the user further operate the adjustment knob to extend the two straps and then retract them. Therefore, the telescopic adjustment mechanisms of wearable devices in the related art are inconvenient to use, impacting the user experience. Summary of the Invention

[0004] The main purpose of the present invention is to provide a telescopic adjustment mechanism, aiming to improve the user experience.

[0005] To achieve the above-mentioned purpose, the telescopic adjustment mechanism proposed by the present invention includes:

[0006] Install the carrier;

[0007] a first adjustment assembly, comprising a driving gear, two driven racks, and a first elastic member, wherein the driving gear is rotatably mounted on the mounting carrier, the two driven racks are respectively engaged with opposite sides of the driving gear, and the first elastic member is disposed between the mounting carrier and the driving gear; and

[0008] a second adjustment assembly, the second adjustment assembly comprising an adjustment knob and a transmission structure, the adjustment knob being rotatably mounted on the mounting carrier, and when the adjustment knob is rotated in a first direction, the adjustment knob can drive the transmission structure to conduct transmission to the driving gear and lock the driving gear from rotating in a second direction opposite to the first direction;

[0009] When the adjusting knob is rotated in the second direction, the adjusting knob can drive the transmission structure to block the transmission to the driving gear and release the locking of the driving gear's rotation in the second direction.

[0010] Optionally, the driving gear includes a first gear portion and a second gear portion connected to each other on its rotation axis, opposite sides of the first gear portion are engaged with the two driven racks, and the first elastic member is provided between the mounting carrier and the first gear portion;

[0011] When the adjusting knob is rotated in the first direction, the transmission structure can conduct transmission to the second gear part and lock the rotation of the second gear part in the second direction;

[0012] When the adjusting knob is rotated in the second direction, the transmission structure can block the transmission to the second gear part and release the locking of the second gear part from rotating in the second direction.

[0013] Optionally, the transmission structure includes:

[0014] a carrying plate, the carrying plate being slidably provided with the mounting carrier and being located between the adjusting knob and the second gear portion;

[0015] a piston member rotatably disposed on the supporting plate, wherein the rotation axis of the piston member is collinear with the rotation axes of the adjusting knob and the second gear portion, and the end of the piston member proximate to the adjusting knob can be abutted and driven for rotation by the adjusting knob; and

[0016] a first pawl, the first pawl being provided on a side of the bearing plate facing the second gear portion;

[0017] When the adjusting knob is rotated along the first direction, the adjusting knob can drive the supporting plate to slide in the direction close to the second gear part, so that the piston member transmits the transmission to the second gear part, and the first pawl locks the rotation of the second gear part in the second direction; when the adjusting knob is rotated along the second direction, the adjusting knob can drive the supporting plate to slide and reset in the direction close to the adjusting knob.

[0018] Optionally, the adjusting knob includes an inner knob and an outer knob nested together, and when the outer knob drives the inner knob to rotate in the first direction, the inner knob can abut against and drive the piston to rotate and drive the bearing plate to slide in a direction close to the second gear portion;

[0019] When the outer knob rotates relative to the inner knob along the second direction, the outer knob can drive the supporting plate to slide and reset in a direction close to the adjusting knob.

[0020] Optionally, the piston is provided with a first meshing tooth at one end close to the inner knob, and a second meshing tooth at one end close to the second gear portion;

[0021] The inner knob is provided with a first driving tooth at a position corresponding to the piston member, and the first driving tooth meshes with the first engaging tooth, so that the inner knob can abut against and drive the piston member to rotate;

[0022] The second gear portion is provided with a second driving tooth at a position corresponding to the second meshing tooth. When the carrier plate is abutted and driven by the inner knob, the second meshing tooth can mesh with the second driving tooth to conduct transmission to the second gear portion.

[0023] Optionally, the piston is an annular structure, and the first meshing teeth are provided on the inner side of one end of the piston close to the inner knob, and the second meshing teeth are provided on the outer side of one end of the piston close to the second gear portion;

[0024] The inner knob is provided with a connecting post at a position corresponding to the piston member, the connecting post is inserted into the piston member, and the side wall surface of the connecting post is provided with the first driving tooth;

[0025] A connecting groove is provided on the side of the second gear portion facing the inner knob, and the groove wall of the connecting groove is used to enclose and form its groove opening and is provided with the second driving tooth. When the supporting plate is abutted and driven by the inner knob, the piston member can be inserted into the connecting groove so that the second meshing tooth engages with the second driving tooth.

[0026] Optionally, the inner knob is further provided with a third driving tooth, and the carrying plate is provided with a third engaging tooth at a position opposite to the third driving tooth for engaging therewith;

[0027] When the outer knob drives the inner knob to rotate in the first direction, the inner knob drives the carrying plate to slide in a direction close to the second gear portion through the cooperation between the third driving teeth and the third engaging teeth.

[0028] Optionally, the transmission structure further includes a sliding plate, a second elastic member and a third elastic member;

[0029] The sliding plate is slidably disposed on the mounting carrier, and the second elastic member is disposed between the mounting carrier and the sliding plate. When the supporting plate is abutted and driven to slide by the inner knob, the second elastic member can drive the sliding plate to abut against the supporting plate, so as to prevent the supporting plate from sliding back in a direction close to the adjusting knob.

[0030] When the outer knob rotates relative to the inner knob in the second direction, the outer knob can drive the sliding plate to slide, and the direction in which the outer knob drives the sliding plate to slide is opposite to the direction in which the second elastic member drives the sliding plate to slide.

[0031] The third elastic member is disposed between the second gear portion and the piston member to drive the piston member, the first pawl, and the supporting plate to slide and reset in a direction close to the adjusting knob.

[0032] Optionally, the transmission structure further includes a second pawl, and the second pawl is rotatably provided on the sliding plate;

[0033] A fourth meshing tooth is provided on the outer side of the outer knob, and one end of the second pawl can abut against the fourth meshing tooth to prevent the outer knob from rotating in the second direction;

[0034] When the outer knob rotates along the second direction, the outer knob drives the sliding plate to slide by abutting against the second pawl.

[0035] The present invention also provides a wearable device comprising the telescopic adjustment mechanism described above.

[0036] When applied to a wearable device, the telescopic adjustment mechanism of the present invention can initially adjust the size of the wearable device's wearing space using the first adjustment component. Specifically, since the driving gear in the first adjustment component is not in transmission communication with the second adjustment component in its initial state, it can freely rotate in both directions. In this case, the user can directly pull the two driven racks or the straps connected to the driven racks to adjust the wearable device's length. This allows the wearable device to be extended to a size larger than the size of the wearable part (e.g., the head), making it easier for the user to quickly and directly put it on. After the wearable device is attached to the body and the pulling force on the two driven racks or the straps connected to the driven racks is removed, the first elastic member, under the action of its deforming elastic force, drives the driving gear to rotate and return. During this rotational return process, the two driven racks move closer and contract, completing the initial adjustment of the telescopic mechanism. To improve the wearability of the wearable device, a secondary fine-tuning can then be performed. Specifically, a user can rotate the adjustment knob in the second adjustment process in a first direction (which can be either clockwise or counterclockwise) to cause the transmission structure to transmit transmission to the driving gear. In this case, rotating the adjustment knob in the first direction also drives the driving gear to rotate in the first direction, thereby causing the two driven racks to continue to move closer together until the telescopic adjustment mechanism contracts to the user's desired tightening force. At this point, the adjustment knob can be canceled, completing the secondary adjustment of the telescopic mechanism. When the adjustment knob is canceled, the transmission structure can lock the driving gear from rotating in a second direction (which can be either clockwise or counterclockwise) opposite to the first direction. This prevents the driving gear, which is in transmission communication with the transmission structure, from rotating in the second direction, thereby ensuring that the telescopic adjustment mechanism remains stably positioned while maintaining a certain contraction force.

[0037] Therefore, the structural configuration of the telescopic adjustment mechanism in this embodiment allows the user to initially adjust the size of the wearable device's wearing space directly through the first adjustment component, achieving a relatively quick adjustment to initially fit the wearable device. After completing the initial adjustment, the user can then activate the second adjustment component to further adjust the telescopic adjustment mechanism to a certain tightening force, completing the final adjustment of the telescopic adjustment mechanism. This is in contrast to conventional telescopic adjustment mechanisms, which require the user to repeatedly and laboriously operate the adjustment knob to complete the entire telescopic adjustment process. The adjustment mechanism in this embodiment, which features both initial adjustment and secondary fine-tuning, initially adapts the telescopic adjustment mechanism to the human body. Therefore, secondary fine-tuning only requires the user to rotate the adjustment knob for a short period of time (even less than one turn) to ensure that the telescopic adjustment mechanism maintains a certain contraction force. Both the initial and secondary fine-tuning processes are relatively simple and quick, eliminating the need for the user to perform laborious and time-consuming adjustments. This improves the convenience of using the telescopic adjustment mechanism and enhances the user experience.

[0038] When the wearable device needs to be removed, the adjustment knob of the second adjustment component can be driven to rotate in the second direction, driving the transmission structure to block the transmission to the driving gear and unlocking the rotation of the driving gear in the second direction. At this time, the driving gear in the first adjustment component is unlocked again and can rotate freely in both directions, which makes it convenient for the user to directly pull the two driven racks or the straps connected to the driven racks to extend the telescopic adjustment mechanism, thereby quickly removing the wearable device. Therefore, the unlocking operation of the telescopic adjustment mechanism in the present application is also simple and quick, and the user does not need to perform the more tedious operation of driving the adjustment knob to rotate the driving gear in order to extend the two driven racks away from each other, further improving the convenience of using the telescopic adjustment mechanism in this solution and further enhancing the user experience.

[0039] Furthermore, the telescopic adjustment transmission structure of this embodiment not only transmits power to the driving gear but also stops the driving gear from rotating in the second direction. This transmission structure further allows the driving gear to be locked after telescopic adjustment. This eliminates the need for a separate locking structure to lock the driving gear after telescopic adjustment, simplifying the structure of the telescopic adjustment mechanism and improving its ease of manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0041] Figure 1 This is a structural diagram of an embodiment of the telescopic adjustment mechanism of the present invention;

[0042] Figure 2 for Figure 1 Schematic diagram of the telescopic adjustment mechanism from another perspective;

[0043] Figure 3 for Figure 1 Another perspective diagram of the telescopic adjustment mechanism;

[0044] Figure 4 for Figure 1 A schematic diagram of the exploded structure of the telescopic adjustment mechanism from one perspective;

[0045] Figure 5 for Figure 1 Schematic diagram of the exploded structure of the telescopic adjustment mechanism from another perspective;

[0046] Figure 6 This is a schematic diagram of a transmission structure of the telescopic adjustment mechanism of the present invention in a state where the transmission to the driving gear is not conducted;

[0047] Figure 7 This is a schematic diagram of the transmission structure of the telescopic adjustment mechanism of the present invention in a state where the transmission is conducted to the driving gear;

[0048] Figure 8 for Figure 1 A schematic diagram of a partial structure of the telescopic adjustment mechanism;

[0049] Figure 9 for Figure 8 A schematic diagram of a partially exploded structure of the telescopic adjustment mechanism from one perspective;

[0050] Figure 10 for Figure 8 A schematic diagram of a partially exploded structure of the middle telescopic adjustment structure from another perspective;

[0051] Figure 11 for Figure 9 A one-way diagram of the exploded structure of the middle adjustment knob;

[0052] Figure 12 for Figure 9 Another perspective diagram of the exploded structure of the middle adjustment knob;

[0053] Figure 13 for Figure 9 A schematic diagram of a partially exploded structure of the telescopic adjustment mechanism from one perspective;

[0054] Figure 14 for Figure 9 Schematic diagram of the partially exploded structure of the telescopic adjustment mechanism from another perspective;

[0055] Figure 15 A schematic diagram of an exploded structure of the transmission structure of the telescopic adjustment mechanism of the present invention from one perspective;

[0056] Figure 16 A schematic diagram showing the exploded structure of the transmission structure of the telescopic adjustment mechanism of the present invention from another perspective;

[0057] Figure 17 A schematic diagram of an exploded structure of a first adjustment component of the telescopic adjustment mechanism of the present invention from one perspective;

[0058] Figure 18 This is a schematic diagram from another perspective of the exploded structure of the first adjustment component of the telescopic adjustment mechanism of the present invention.

[0059] Description of Figure Numbers:

[0060]

[0061] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0062] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0063] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0064] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0065] In addition, the descriptions of "first", "second", etc. in the present invention are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text is to include three parallel solutions. Taking "A and / or B as an example", it includes solution A, or solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in this field to implement them. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0066] Please refer to Figures 1 to 18 The present invention proposes a telescopic adjustment mechanism 100. In one embodiment of the present invention, the telescopic adjustment mechanism 100 includes a mounting carrier 10, a first adjustment component 30, and a second adjustment component 50. The first adjustment component 30 includes a driving gear 31, two driven racks 33, and a first elastic member 35. The driving gear 31 is rotatably arranged on the mounting carrier 10. The two driven racks 33 are respectively engaged with the opposite sides of the driving gear 31. The first elastic member 35 is arranged between the mounting carrier 10 and the driving gear 31; the second adjustment component 50 includes an adjusting knob 51 and a transmission structure 53. The adjustment knob 51 is rotatably provided on the mounting carrier 10, and when the adjustment knob 51 is rotated in a first direction (which can be one of clockwise and counterclockwise), the adjustment knob 51 can drive the transmission structure 53 to conduct the transmission to the driving gear 31, and lock the rotation of the driving gear 31 in a second direction opposite to the first direction (which can be the other of clockwise and counterclockwise); when the adjustment knob 51 is rotated in the second direction, the adjustment knob 51 can drive the transmission structure 53 to block the transmission to the driving gear 31, and release the lock on the rotation of the driving gear 31 in the second direction.

[0067] The telescopic adjustment mechanism 100 described above can be applied to a wearable device, which can be a head-mounted display device. The head-mounted display device can include a display host, a rear housing, and two straps. The rear housing and the display host are spaced apart from each other, and one end of the two straps can be connected to opposite ends of the display host, while the other end can be slidably inserted into opposite ends of the rear housing. In this case, the mounting carrier 10 in the telescopic adjustment mechanism 100 can be formed directly from a portion of the rear housing, or alternatively, it can be a separate mounting carrier 10 provided separately from the rear housing, providing a mounting location for the first adjustment component 30 and the second adjustment component 50. Similarly, the two driven racks 33 in the telescopic adjustment mechanism 100 can be formed directly from a portion of the two straps, or alternatively, they can be separate and independent of the two straps. The two driven racks 33 can be connected to the two straps, respectively, so that when the two driven racks 33 are moved closer or farther apart, they can be tightened or extended accordingly. In some embodiments, the wearable device can also be a waist-worn device. This waist-worn device can include a main body (e.g., a component for physical therapy or body shaping) and two straps connected to the main body. In this case, the mounting carrier 10 and the main body can be spaced apart relative to each other, and the two straps can also be directly connected to the two driven racks 33. Therefore, this application does not limit the specific type of device in which the telescopic adjustment mechanism 100 can be used. Only devices that can use similar two straps for telescopic adjustment can use the telescopic adjustment mechanism 100 described in this application.

[0068] Furthermore, the mounting carrier 10 in the telescopic adjustment mechanism 100 can be used to provide a mounting location for assembling the first adjustment assembly 30, the second adjustment assembly 50, and other components of the telescopic adjustment mechanism 100 into a single integrated structure. As described above, it can be directly formed as part of the housing of the device to which the telescopic adjustment mechanism 100 is subsequently applied (such as the rear housing of the head-mounted display device described above); or it can be a component provided independently of the housing. In this case, the mounting carrier 10 can be formed by a combination of multiple plates, multiple columns, or a combination of multiple plates and multiple columns. The first adjustment assembly 30 can be used to initially adjust the size of the space enclosed by the strap of the wearable device. It includes a driving gear 31, two driven racks 33, and a first elastic member 35. By directly pulling the two straps, the two driven racks 33 move away from each other, allowing the user to quickly adjust the size of the wearing space enclosed by the strap to be larger than the wearable part of the body, making it easier for the user to wear the device. During the movement of the driven racks 33 away from each other, the driving gear 31 is driven by the driven gear 31 to rotate in the second direction due to its meshing with the driven gear 31, and the first elastic member 35 is deformed to generate a deformation elastic force. Therefore, after the wearable device is worn and the tension acting on the strap is canceled, the driving gear 31 will rotate and reset under the action of the deformation elastic force of the first elastic member 35, driving the two driven racks 33 to move closer to each other, so that the two straps of the wearable device can be preliminarily adapted to fit the wearing part of the human body. In order to facilitate the installation of the first elastic member 35, the first elastic member 35 can be a spiral spring so that it can be directly mounted on the rotating shaft of the driving gear 31 for rotational connection to the mounting carrier 10. At this time, the inner connecting arm at the inner end of the spiral spring can be plugged into the spiral spring, and the outer connecting arm at the outer end can be plugged into the mounting carrier 10. In addition, after the wearable device is initially worn, the tightening force that can be applied by the first elastic member 35 is limited, and the limiting of the rotation of the active gear 31 in the second direction is not stable enough. Therefore, the tightening force of the telescopic adjustment mechanism 100 can be further adjusted again by the second adjustment component 50, and the rotation of the active gear 31 in the second direction can be advantageously locked after the adjustment. Specifically, the second adjustment component 50 includes an adjustment knob 51 and a transmission structure 53. The adjustment knob 51 can be used to provide an operating position, and at least part of the structure is exposed to the outside world for the user to perform a rotation operation. The transmission structure 53 can be used to conduct the transmission to the active gear 31 and limit the rotation of the active gear 31 in the second direction.Thus, when the adjustment knob 51 is rotated in the first direction, the transmission structure 53 drives the driving gear 31 to rotate in the first direction, thereby driving the two driven racks 33 closer together, thereby achieving a certain tightening force for the telescopic adjustment mechanism 100. At the same time, the transmission structure 53 also blocks the rotation of the driving gear 31 in the second direction. This means that after the driven gears meshing with the driving gear 31 approach and tighten, they will not move away from each other due to the reaction force of the wearer's body, thereby ensuring that the telescopic adjustment mechanism 100 can be stably maintained in a state with a certain tightening force when worn.

[0069] When applied to a wearable device, the telescopic adjustment mechanism 100 of the present invention can initially adjust the size of the wearable device's wearing space through the first adjustment assembly 30. Specifically, since the driving gear 31 in the first adjustment assembly 30 is not in transmission communication with the second adjustment assembly 50 in its initial state, the driving gear 31 can rotate freely in both directions. At this point, the user can directly pull the two driven racks 33 or the straps connected to the driven racks 33 to adjust the wearable device's length. This allows the wearable device to be extended to a size larger than the size of the wearable part (e.g., the head), making it easier for the user to quickly and directly wear the device. After the wearable device is worn on the body and the pulling force on the two driven racks 33 or the straps connected to the driven racks 33 is removed, the first elastic member 35, under the action of its deforming elastic force, drives the driving gear 31 to rotate and return. During this rotational return process, the two driven racks 33 move closer and contract, thereby completing the initial adjustment of the telescopic mechanism. To improve the wearability of the wearable device, a secondary fine-tuning can then be performed. Specifically, the user can rotate the adjustment knob 51 in a first direction (which can be either clockwise or counterclockwise) during the second adjustment process, thereby driving the transmission structure 53 to transmit transmission to the driving gear 31. Rotating the adjustment knob 51 in the first direction also drives the driving gear 31 in the first direction, thereby causing the two driven racks 33 to move closer together until the telescopic adjustment mechanism 100 contracts to the desired tightening force. At this point, the adjustment knob 51 is released, completing the secondary adjustment of the telescopic mechanism. When the adjustment knob 51 is released, the transmission structure 53 locks the driving gear 31 from rotating in a second direction (which can be either clockwise or counterclockwise) opposite the first direction. This prevents the driving gear 31, which is in transmission communication with the transmission structure 53, from rotating in the second direction, thereby ensuring that the telescopic adjustment mechanism 100 remains stably positioned while maintaining a certain contraction force.

[0070] Therefore, the structure of the telescopic adjusting mechanism 100 in the present solution is arranged so that the user can directly preliminarily adjust the size of the wearing space of the wearable device by the first adjusting assembly 30 when using, so as to quickly adjust the wearable device to preliminarily fit the user for wearing. Then, after the preliminary adjustment is completed, the second adjusting assembly 50 is driven to further adjust the telescopic adjusting mechanism 100 to have a certain tightening force to complete the final adjustment of the telescopic adjusting mechanism 100. Thus, compared with the telescopic adjusting mechanism 100 in the prior art, the user needs to drive the adjusting knob 51 for a time-consuming and laborious operation to complete the entire telescopic adjustment process. In the present solution, the adjusting mechanism has preliminary adjustment and secondary fine adjustment. After the preliminary adjustment is completed, the telescopic adjusting mechanism 100 can preliminarily fit the human body, so that the secondary fine adjustment only needs the user to drive the adjusting knob 51 to rotate for a short time (even less than one circle), so that the telescopic adjusting mechanism 100 can further have a certain contraction force. At this time, the processes of preliminary adjustment and secondary fine adjustment are relatively simple and fast, and the user does not need to perform a time-consuming and laborious adjustment operation, so that the convenience of using the telescopic adjusting mechanism 100 is improved, and the user experience is improved.

[0071] When the wearable device needs to be removed, the adjusting knob 51 of the second adjusting assembly 50 is driven to rotate in the second direction, the transmission structure 53 is blocked to drive the driving gear 31, and the locking of the rotation of the driving gear 31 in the second direction is released. At this time, the driving gear 31 in the first adjusting assembly 30 is unlocked again and can rotate freely in both directions, so that the user can directly pull the two driven racks 33 or the binding band connected to the driven racks 33 to make the telescopic adjusting mechanism 100 elongate, so as to quickly remove the wearable device. Therefore, the unlocking operation of the telescopic adjusting mechanism 100 in the present application is also simple and fast, and the user does not need to perform a relatively complicated operation of driving the adjusting knob 51 to rotate to drive the driving gear 31 to rotate, so as to realize the elongation of the two driven racks 33 away from each other, which further improves the convenience of using the telescopic adjusting mechanism 100 in the present solution, so as to further improve the user experience.

[0072] Furthermore, the telescopic adjustment transmission structure 53 of this embodiment not only transmits power to the driving gear 31 but also stops the driving gear 31 from rotating in the second direction. Specifically, the transmission structure 53 further enables the driving gear 31 to be locked after the telescopic adjustment is completed. This eliminates the need for an additional locking structure to lock the driving gear 31 after the telescopic adjustment is completed, thereby simplifying the structure of the telescopic adjustment mechanism 100 and improving its ease of manufacture.

[0073] Please refer to Figures 4 to 7 In one embodiment of the present invention, the driving gear 31 includes a first gear portion 311 and a second gear portion 313 connected on its rotation axis, opposite sides of the first gear portion 311 are engaged with two driven racks 33, and the first elastic member 35 is arranged between the mounting carrier 10 and the first gear portion 311; when the adjusting knob 51 is rotated along the first direction, the transmission structure 53 can conduct the transmission to the second gear portion 313 and lock the rotation of the second gear portion 313 in the second direction; when the adjusting knob 51 is rotated along the second direction, the transmission structure 53 can block the transmission to the second gear portion 313 and release the lock on the rotation of the second gear portion 313 in the second direction.

[0074] In this embodiment, the driving gear 31 is configured as a coaxial first gear portion 311 and a second gear portion 313. The first gear portion 311 can provide an engagement position for meshing with the two driven racks 33, while the second gear portion 313 can provide a conduction position and a stop position for conduction by the transmission structure 53. This allows different components to be connected to different components separately, which can better avoid the possibility of interference between the driven racks 33 and the transmission structure 53, thereby facilitating the stability of the telescopic adjustment mechanism 100 during the telescopic adjustment process. Moreover, the structure of the driving gear 31 is relatively simple, which facilitates the manufacturing of the driving gear 31. Of course, it should be noted that the present application is not limited to this. In other embodiments, the driving gear 31 can also include only the first gear portion 311. In this case, the two driven racks 33 can mesh with the side surface of the first gear portion 311, and the first elastic member 35 can be connected between the mounting carrier 10 and the rotating shaft provided on the side end surface of the first gear portion 311 for rotational connection. The side end surface of the first gear part 311 facing away from the rotating shaft can be provided with a transmission part and a limiting part, so that the transmission structure 53 can achieve transmission of the first gear part 311 and limit the rotation of the first gear part 311 in the second direction by abutting against the transmission part and the limiting part.

[0075] Further, please refer to Figures 4 to 16The transmission structure 53 comprises a bearing plate 531, a piston 533 and a first pawl 536. The bearing plate 531 is slidably arranged on the mounting carrier 10 and located between the adjusting knob 51 and the second gear portion 313. The piston 533 is rotatably arranged on the bearing plate 531, and the rotation axis of the piston 533 is arranged in line with the rotation axis of the adjusting knob 51 and the second gear portion 313, and the end close to the adjusting knob 51 can be abutted by the adjusting knob 51 to drive rotation. The first pawl 536 is arranged on the side of the bearing plate 531 facing the second gear portion 313. When the adjusting knob 51 rotates in the first direction, the adjusting knob 51 can drive the bearing plate 531 to slide in the direction close to the second gear portion 313, so that the piston 533 drives the transmission of the second gear portion 313, and the first pawl 536 locks the rotation of the second gear portion 313 in the second direction. When the adjusting knob 51 rotates in the second direction, the adjusting knob 51 can drive the bearing plate 531 to slide in the direction close to the adjusting knob 51 to reset.

[0076] In the embodiment, the bearing plate 531 can provide a mounting position, facilitating the assembly of the piston 533 and the first pawl 536 into an integral whole, thereby simplifying the structure and enabling the transmission structure 53 to be installed on the mounting carrier 10 in one go. Moreover, the piston 533 and the first pawl 536 are both close to the second gear portion 313 when the bearing plate 531 is close to the second gear portion 313, and abut against the second gear portion 313 to realize the abutment transmission of the piston 533 to the second gear portion 313 and the abutment limiting of the rotation of the piston 533. At this time, the movements of the piston 533 and the first pawl 536 are unified and relatively simple, thereby facilitating the realization of the transmission of the transmission structure 53 to the driving gear 31 and the locking of the rotation of the driving gear 31 in the second direction. In addition, the transmission structure 53 at this time is a pure mechanical structure and does not involve circuits and gas circuits, thereby being conducive to improving the safety of the transmission structure 53. In order to facilitate the rotation reset of the first pawl 536 and more stably limit the rotation of the second gear portion 313 in the second direction, a spring or a plastic part with elasticity can be arranged between the first pawl 536 and the mounting carrier 10. In addition, it should be noted that the application is not limited to this, and in other embodiments, the transmission structure 53 can also comprise a bearing plate 531, a piston 533, a gas cylinder and a stop rod connected to the gas cylinder. At this time, after the bearing plate 531 is close to the second gear portion 313, the piston 533 can still abut against the second gear portion 313. The difference is that after the adjustment is completed, the stop rod is driven by the gas cylinder to be inserted between the adjacent two teeth on the side periphery of the second gear, so as to limit the rotation of the second gear portion 313.

[0077] Further, please refer to Figures 4 to 7The adjusting knob 51 includes an inner knob 511 and an outer knob 516 which are arranged in a nested manner. When the outer knob 516 drives the inner knob 511 to rotate in a first direction, the inner knob 511 can abut against and drive the piston member 533 to rotate and drive the supporting plate 531 to slide in a direction close to the second gear portion 313; when the outer knob 516 rotates relative to the inner knob 511 in a second direction, the outer knob 516 can drive the supporting plate 531 to slide and reset in a direction close to the adjusting knob 51.

[0078] In this embodiment, when the outer knob 516 is rotated in the first direction, the inner knob 511 can directly abut and drive the supporting plate 531 toward the second gear portion 313. That is, the adjusting knob 51 can directly drive the supporting plate 531, eliminating the need for additional drive components, thereby further simplifying the structure of the telescopic adjustment mechanism 100. By configuring the adjusting knob 51 as a nested inner knob 511 and outer knob 516, rotating the inner knob 511 in the first direction can drive the supporting plate 531 to slide toward the second gear portion 313, causing the piston 533 to abut against the second gear portion 313, thereby transmitting the transmission to the second gear portion 313, and the first pawl 536 to abut against the second gear portion 313, thereby locking the second gear portion 313 from rotating in the second direction. Rotating the outer knob 516 in the second direction can cause the carrier plate 531 to slide and reset in a direction away from the second gear portion 313, causing the piston 533 to disengage from the second gear portion 313, thereby blocking the transmission to the second gear portion 313 and releasing the first pawl 536 from the second gear portion 313, thereby releasing the lock on the second gear portion 313's rotation in the second direction. In this way, different movement functions can be achieved by adjusting the different components of the knob 51, thereby improving the stability of the various movement functions. Specifically, the outer knob 516 can be provided with a first abutment portion, while the inner knob 511 can be provided with a second abutment portion. Furthermore, an elastic member (such as a torsion spring or other elastic plastic member) is mounted on the inner knob 511, which abuts the first abutment portion to force the first and second abutment portions to abut against each other. Thus, when the outer knob 516 is rotated in the first direction, the abutment between the first and second abutment portions can drive the inner knob 511 to rotate accordingly. When the outer knob 516 is rotated in the second direction, the inner knob 511 is in transmission communication with the second gear portion 313 via the piston 533, and the second gear is abutted and limited by the first pawl 536, thereby preventing the inner knob 511 from rotating in the second direction. The outer knob 516 overcomes the elastic force of the elastic body and can rotate in the second direction relative to the inner knob 511. In addition, it should be noted that the present application is not limited to this. In other embodiments, the adjustment knob 51 can also be a knob component, in which case an angle sensor or a steering angle sensor can be provided. The transmission structure 53 may include a supporting plate 531, an upper piston section, a first cylinder, a lower piston section, a second cylinder and a stop rod; the supporting plate 531 can be fixedly mounted on the mounting carrier 10; the upper piston section can be rotatably mounted on the supporting plate 531, and can be abutted and driven by the adjusting knob 51; the first cylinder can be connected to the upper piston section, and the lower piston section can be mounted on the telescopic end of the first cylinder; the second cylinder can be mounted on the supporting plate 531, and the stop rod can be mounted on the piston section of the second cylinder.Thus, when the angle sensor or the steering angle sensor detects that the adjustment knob 51 is rotated in the first direction, the signal indicating the rotation in the first direction can be transmitted to the first cylinder and the second cylinder, so that the first cylinder drives the lower piston segment to engage with the second gear portion 313 for transmission, and the second cylinder drives the stopper rod to engage with the second gear portion 313 for position limiting. Furthermore, when the angle sensor or the steering angle sensor detects that the adjustment knob 51 is rotated in the second direction, the first cylinder and the second cylinder can respectively drive the lower piston segment and the stopper rod to reset.

[0079] Further, please refer to Figures 8 to 14 The piston member 533 is provided with a first meshing tooth 534 at one end close to the inner knob 511, and a second meshing tooth 535 at one end close to the second gear portion 313; the inner knob 511 is provided with a first driving tooth 512 at a position corresponding to the piston member 533, and the first driving tooth 512 is engaged with the first meshing tooth 534, so that the inner knob 511 can abut and drive the piston member 533 to rotate; the second gear portion 313 is provided with a second driving tooth 315 at a position corresponding to the second meshing tooth 535. When the supporting plate 531 is abutted and driven by the inner knob 511, the second meshing tooth 535 can mesh with the second driving tooth 315 to conduct transmission to the second gear portion 313.

[0080] In this embodiment, a first meshing tooth 534 and a first driving tooth 512 are respectively provided on the piston member 533 and the inner knob 511, so that meshing transmission can be performed between the piston member 533 and the inner knob 511, thereby improving the stability of the transmission between the two. Similarly, a second meshing tooth 535 and a second driving tooth 315 are respectively provided on the piston member 533 and the second gear portion 313, so that meshing transmission can also be performed between the piston member 533 and the second gear portion 313, thereby also facilitating the improvement of the stability of the transmission between the two. Of course, it should be noted that the present application is not limited to this. In other embodiments, the transmission between the piston member 533 and the inner knob 511 and the second gear portion 313 can also be through friction transmission via surface-to-surface contact, or can also be through abutment transmission via abutting protrusions. In addition, to facilitate the inner knob 511's contact and driving of the carrier plate 531, the inner knob 511 may further be provided with a third driving tooth 514, and the carrier plate 531 may be provided with a third meshing tooth 532 at a position opposite to the third driving tooth 514 for meshing therewith. When the outer knob 516 drives the inner knob 511 to rotate in the first direction, the inner knob 511, through the cooperation between the third driving tooth 514 and the third meshing tooth 532, drives the carrier plate 531 to slide in a direction approaching the second gear portion 313. The two opposing side surfaces of the third driving tooth 514 and the third meshing tooth 532 in the direction of rotation about the adjusting knob 51 may each be a straight surface and a curved surface. This facilitates that when the inner knob 511 is driven by the outer knob 516 to rotate in the first direction, the curved surface of the third driving tooth 514 can press against the curved surface of the third meshing tooth 532, thereby driving the carrier plate 531 to slide in a direction approaching the first gear portion 311.

[0081] Further, please refer to Figures 9 to 16 The piston member 533 is an annular structure. The inner side of the piston member 533 close to the inner knob 511 is provided with a first meshing tooth 534, and the outer side of the end close to the second gear portion 313 is provided with a second meshing tooth 535; the inner knob 511 is provided with a connecting column 513 at a position corresponding to the piston member 533, and the connecting column 513 is inserted into the piston member 533. The side wall of the connecting column 513 is provided with a first driving tooth 512; the second gear portion 313 is provided with a connecting groove 317 on the side facing the inner knob 511, and the connecting groove 317 is used to enclose the groove wall of the groove to form its notch and is provided with a second driving tooth 315. When the supporting plate 531 is abutted and driven by the inner knob 511, the piston member 533 can be inserted into the connecting groove 317 so that the second meshing tooth 535 engages with the second driving tooth 315.

[0082] In this embodiment, the piston member 533 is annular in shape, making it convenient to arrange the first meshing teeth 534 and the second meshing teeth 535 on its inner and outer sides, respectively, and allowing the piston member 533 to be inserted and installed on the inner knob 511 and the second gear portion 313. This makes the adjustment knob 51, the piston member 533, and the second gear portion 313 more compact, thereby further reducing the overall size of the telescopic adjustment mechanism 100 and improving the convenience of its subsequent installation within the limited installation space of the wearable device.

[0083] Please refer to reference 4 to Figure 7 In one embodiment of the present invention, the transmission structure 53 further includes a sliding plate 537, a second elastic member and a third elastic member 538; the sliding plate 537 is slidably provided on the mounting carrier 10, and the second elastic member is provided between the mounting carrier 10 and the sliding plate 537. When the supporting plate 531 is abutted and driven to slide by the inner knob 511, the second elastic member can drive the sliding plate 537 to abut against the supporting plate 531 to prevent the supporting plate 531 from sliding back in the direction close to the adjusting knob 51; when the outer knob 516 is rotated relative to the inner knob 511 in the second direction, the outer knob 516 can drive the sliding plate 537 to slide, and the direction in which the sliding plate 537 is driven to slide by the outer knob 516 is opposite to the direction in which the sliding plate 537 is driven to slide by the second elastic member; the third elastic member 538 is provided between the second gear portion 313 and the piston member 533 to drive the piston member 533, the first pawl 536 and the supporting plate 531 to slide back in the direction close to the adjusting knob 51.

[0084] In this embodiment, the supporting plate 531 may be provided with a high step 531a and a low step 531b. When the outer knob 516 is not driven to rotate in the first direction, the sliding plate 537 may abut against the low step 531b. Figure 6 As shown. Afterwards, when the outer knob 516 is driven to rotate in the first direction, the inner knob 511 is driven to drive the supporting plate 531 to descend close to the second gear portion 313, so that the piston member 533 and the second gear portion 313 can abut and transmit, and the first pawl 536 can abut and limit the rotation of the second gear portion 313 in the second direction. At this time, the piston member 533 descends close to the second gear portion 313 and the third elastic member 538 is compressed, so that it has the driving force to drive the piston member 533 to rise and reset. However, when the supporting plate 531 is abutted and driven by the inner knob 511 to descend close to the second gear portion 313, the second elastic member will promptly drive the sliding plate 537 to slide in the horizontal direction, so that the sliding plate 537 can further abut on the high step 531a located above the low step 531b as shown. Figure 7As shown, this allows the supporting plate 531, the piston 533, and the first pawl 536 to remain in a stable lowered state, so that subsequent rotation of the outer knob 516 in the first direction can drive the second gear portion 313 to rotate accordingly, driving the two driven racks 33 to further tighten. Thereafter, when the outer knob 516 is driven to rotate relative to the inner knob 511 in the second direction, the outer knob 516 can abut against and drive the sliding plate 537 to slide back and disengage from the high step 531a of the supporting plate 531. At this time, the supporting plate 531 can be raised and reset under the action of the third elastic member 538, and the sliding plate 537 is returned to abut against the low step 531b of the supporting plate 531 again. It can be seen that in the present application, the outer knob 516 uses a purely mechanical structure to achieve the reset drive of the supporting plate 531 through the sliding plate 537, the second elastic member, and the third elastic member 538, thereby further improving the safety of the telescopic adjustment structure of the present application. Furthermore, in order to facilitate the outer knob 516 to stably abut and drive the sliding plate 537 only when it is rotated in the second direction relative to the inner knob 511, the transmission structure 53 also includes a second pawl 539, which is rotatably provided on the sliding plate 537; a fourth meshing tooth 517 is provided on the outer side of the outer knob 516, and one end of the second pawl 539 can abut against the fourth meshing tooth 517 to prevent the outer knob 516 from rotating in the second direction; when the outer knob 516 is rotated in the second direction, the outer knob 516 drives the sliding plate 537 to slide by abutting against the second pawl 539. At this time, since the second pawl 539 abuts against and limits the rotation of the outer knob 516 in the second direction, when the outer knob 516 is driven to rotate in the second direction relative to the inner knob 511, the fourth engaging tooth 517 on the outer knob 516 applies a squeezing force to the second pawl 539. Since the sliding plate 537 mounted on the second pawl 539 is slidable, the squeezing force applied to the second pawl 539 is transmitted to the sliding plate 537, thereby driving the sliding plate 537 to slide and reset. In order to facilitate the rotation and reset of the second pawl 539 and to more stably limit the rotation of the outer knob 516 in the second direction, an elastic body, such as a spring or an elastic plastic member, can be provided between the second pawl 539 and the sliding plate 537.

[0085] In one embodiment of the present invention, the telescopic adjustment mechanism 100 of the present application can be used as follows: when the wearable device needs to be worn, the transmission structure 53 does not transmit the transmission to the second gear of the driving gear 31, so that the driving gear 31 is in a state of free bidirectional rotation. At this time, the user can directly pull the two driven racks 33 or the strap connected to the driven racks 33 to extend them to enclose a wearing space larger than the size of the wearing area (such as the head), thereby facilitating the user to quickly wear it to the wearing area. After the wearer is initially worn, the first elastic member 35, under the action of its deformation elastic force, drives the first gear portion 311 of the driving gear 31 to rotate and reset, so that the strap can automatically and quickly complete the initial tightening. To improve the wearing stability of the wearable device, the outer knob 516 of the adjustment knob 51 can be driven to rotate in the first direction. As the outer knob 516 drives the inner knob 511 to rotate in the first direction, the inner knob 511 abuts against the supporting plate 531 of the transmission structure 53, driving it downward toward the second gear portion 313 of the driving gear 31. This allows the piston 533 to abut against the second gear portion 313 for transmission, while the first pawl 536 abuts against the second gear portion 313 to limit the rotation of the second gear portion 313 in the second direction. Simultaneously, as the supporting plate 531 descends, the sliding plate 537, under the action of the second elastic member, moves horizontally, shifting from abutting against the lower step 531b of the supporting plate 531 to abutting against the higher step 531a of the supporting plate 531, thereby preventing the piston 533, the first pawl 536, and the supporting plate 531 from sliding upward. Therefore, as the outer knob 516 continues to rotate in the first direction, the inner knob 511 and the piston 533 sequentially drive the second gear portion 313 to rotate in the first direction, thereby further tightening the two driven racks 33 relative to each other. When the desired tightening force is reached, the force acting on the outer knob 516 can be removed. At this point, the second gear portion 313, due to the abutment and limiting action of the first pawl 536, will not rotate in a second direction opposite to the first direction. This effectively limits both the driving gear 31 and the driven rack 33, thereby ensuring that the wearable device is stably worn on the human body while maintaining a certain tightening force. Later, when the wearable device needs to be removed, the outer knob 516 can be driven to rotate relative to the inner knob 511 in the second direction, overcoming the elastic force. At this point, the abutment of the second pawl 539 can drive the sliding plate 537 to move, disengaging it from the high step 531a of the support plate 531. When the supporting plate 531 is abutted and limited by the sliding plate 537, it can be driven to rise and reset by the third elastic member 538, so that the piston member 533 and the first pawl 536 are disengaged from the second gear portion 313, and the driving gear 31 can rotate freely in both directions again, so that the user can directly pull the two driven racks 3337 or the strap to quickly remove the wearable device.

[0086] The present invention also proposes a wearable device, which includes a telescopic adjustment mechanism 100. The specific structure of the telescopic adjustment mechanism 100 refers to the above-mentioned embodiment. Since the wearable device adopts all the technical solutions of all the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here. Among them, the wearable device can be a head-mounted display device. The head-mounted display device can include a display host, a rear shell and two straps; the rear shell and the display host are arranged at a relative interval, and one end of the two straps can be respectively connected to the opposite ends of the display host, and the other end can be slidably inserted into the two ends of the rear shell. At this time, the mounting carrier 10 in the telescopic adjustment mechanism 100 can be directly formed by a part of the structure on the rear shell; of course, it can also be an additional mounting carrier 10 set independently of the rear shell, which can be used to provide a mounting position for the first adjustment component 30 and the second adjustment, etc. to be installed. Similarly, the two driven racks 33 in the telescopic adjustment mechanism 100 can also be directly formed by a portion of the structure on the two strap members; of course, the two driven racks 33 can also be provided separately from the two strap members. The two driven racks 33 can be connected to the two strap members respectively, so that when the two driven racks 33 are driven closer to each other or farther away from each other, the two driven racks 33 can be correspondingly tightened or extended. In some embodiments, the wearable device can also be a waist-worn device. The waist-worn device can include a main body (such as a component for physical therapy or body shaping) and two strap members connected to the main body. In this case, the mounting carrier 10 and the active part can be arranged with a relative spacing, and the two strap members can also be directly connected to the two driven racks 33.

[0087] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A telescopic adjustment mechanism, characterized in that: include: Install the carrier; a first adjustment assembly, the first adjustment assembly comprising a driving gear, two driven racks, and a first elastic member, the driving gear being rotatably mounted on the mounting carrier, the two driven racks being respectively engaged with opposite sides of the driving gear, and the first elastic member being disposed between the mounting carrier and the driving gear; as well as a second adjustment assembly, the second adjustment assembly comprising an adjustment knob and a transmission structure, the adjustment knob being rotatably mounted on the mounting carrier, and when the adjustment knob is rotated in a first direction, the adjustment knob can drive the transmission structure to conduct transmission to the driving gear and lock the driving gear from rotating in a second direction opposite to the first direction; When the adjusting knob is rotated in the second direction, the adjusting knob can drive the transmission structure to block the transmission to the driving gear and release the locking of the driving gear's rotation in the second direction; The driving gear includes a first gear portion and a second gear portion connected to each other on its rotation axis, opposite sides of the first gear portion are engaged with the two driven racks, and the first elastic member is provided between the mounting carrier and the first gear portion; The transmission structure includes a supporting plate, a piston member, and a first pawl. The supporting plate is slidably provided with the mounting carrier and is located between the adjusting knob and the second gear portion. The piston member is rotatably provided on the supporting plate. The rotation axis of the piston member is collinear with the rotation axes of the adjusting knob and the second gear portion, and the end of the piston member close to the adjusting knob can be abutted by the adjusting knob to be driven for rotation. The first pawl is provided on a side of the supporting plate facing the second gear portion. When the adjusting knob is rotated in a first direction, the adjusting knob can drive the supporting plate to slide in a direction close to the second gear portion, so that the piston member conducts the transmission to the second gear portion, and the first pawl locks the rotation of the second gear portion in the second direction; when the adjusting knob is rotated in the second direction, the adjusting knob can drive the supporting plate to slide and reset in a direction close to the adjusting knob; the adjusting knob includes an inner knob and an outer knob which are arranged in a nested manner, and when the outer knob drives the inner knob to rotate in the first direction, the inner knob can abut to drive the piston member to rotate and drive the supporting plate to slide in a direction close to the second gear portion; when the outer knob rotates in the second direction relative to the inner knob, the outer knob can drive the supporting plate to slide and reset in a direction close to the adjusting knob.

2. The telescopic adjustment mechanism according to claim 1, wherein: When the adjusting knob is rotated in the first direction, the transmission structure can conduct transmission to the second gear part and lock the rotation of the second gear part in the second direction; When the adjusting knob is rotated in the second direction, the transmission structure can block the transmission to the second gear part and release the locking of the second gear part from rotating in the second direction.

3. The telescopic adjustment mechanism according to claim 1, wherein: The piston is provided with a first meshing tooth at one end close to the inner knob, and a second meshing tooth at one end close to the second gear portion; The inner knob is provided with a first driving tooth at a position corresponding to the piston member, and the first driving tooth meshes with the first engaging tooth, so that the inner knob can abut against and drive the piston member to rotate; The second gear portion is provided with a second driving tooth at a position corresponding to the second meshing tooth. When the carrier plate is abutted and driven by the inner knob, the second meshing tooth can mesh with the second driving tooth to conduct transmission to the second gear portion.

4. The telescopic adjustment mechanism according to claim 3, wherein: The piston is an annular structure, and the first meshing teeth are provided on the inner side of one end of the piston close to the inner knob, and the second meshing teeth are provided on the outer side of one end of the piston close to the second gear portion; The inner knob is provided with a connecting post at a position corresponding to the piston member, the connecting post is inserted into the piston member, and the side wall surface of the connecting post is provided with the first driving tooth; A connecting groove is provided on the side of the second gear portion facing the inner knob, and the groove wall of the connecting groove is used to enclose and form its groove opening and is provided with the second driving tooth. When the supporting plate is abutted and driven by the inner knob, the piston member can be inserted into the connecting groove so that the second meshing tooth engages with the second driving tooth.

5. The telescopic adjustment mechanism according to claim 1, wherein: The inner knob is further provided with a third driving tooth, and the bearing plate is provided with a third meshing tooth at a position opposite to the third driving tooth for meshing with the third driving tooth; When the outer knob drives the inner knob to rotate in the first direction, the inner knob drives the carrying plate to slide in a direction close to the second gear portion through the cooperation between the third driving teeth and the third engaging teeth.

6. The telescopic adjustment mechanism according to any one of claims 1 to 5, characterized in that: The transmission structure further includes a sliding plate, a second elastic member and a third elastic member; The sliding plate is slidably disposed on the mounting carrier, and the second elastic member is disposed between the mounting carrier and the sliding plate. When the supporting plate is abutted and driven to slide by the inner knob, the second elastic member can drive the sliding plate to abut against the supporting plate, so as to prevent the supporting plate from sliding back in a direction close to the adjusting knob. When the outer knob rotates relative to the inner knob in a second direction, the outer knob can drive the sliding plate to slide, and the direction in which the sliding plate is driven to slide by the outer knob is opposite to the direction in which the sliding plate is driven to slide by the second elastic member; The third elastic member is disposed between the second gear portion and the piston member to drive the piston member, the first pawl, and the supporting plate to slide and reset in a direction close to the adjusting knob.

7. The telescopic adjustment mechanism according to claim 6, wherein: The transmission structure further includes a second pawl rotatably disposed on the sliding plate; A fourth meshing tooth is provided on the outer side of the outer knob, and one end of the second pawl can abut against the fourth meshing tooth to prevent the outer knob from rotating in the second direction; When the outer knob rotates along the second direction, the outer knob drives the sliding plate to slide by abutting against the second pawl.

8. A wearable device, characterized in that: It comprises the telescopic adjustment mechanism according to any one of claims 1 to 7.

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