Telescopic adjustment mechanism and wearable device

Abstract

The application discloses a telescopic adjusting mechanism and wearable equipment. The telescopic adjusting mechanism comprises a mounting carrier, an adjusting assembly and a clutch assembly. The adjusting assembly comprises a driving gear, two driven racks, a first elastic member and an adjusting knob. The driving gear is rotatably arranged on the mounting carrier. The two driven racks are respectively engaged with the driving gear. The first elastic member is arranged between the mounting carrier and the driving gear. The adjusting knob is rotatably arranged on the mounting carrier. The clutch assembly comprises a worm wheel and a worm. The worm wheel is rotatably arranged on the mounting carrier and can drive the driving gear. The worm is in transmission connection with the adjusting knob. When the adjusting knob rotates in a first direction, the worm can be moved to engage with the worm wheel to conduct the transmission of the adjusting knob to the driving gear. When the adjusting knob rotates in a second direction opposite to the first direction, the worm can be moved to disengage from the worm wheel to block the transmission of the adjusting knob to the driving gear. The technical scheme of the application can improve the user experience.

Description

Technical Field

[0001] The present invention relates to the technical field of wearable 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 adjust the two straps through a telescopic adjustment mechanism. The telescopic adjustment mechanism of the wearable device in the related art usually includes an adjustment knob, a driving gear, a driven rack connected to the two straps or directly set on the strap, 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 limit the contact of the driving gear, 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 convenience of using the telescopic adjustment mechanism and enhance 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] an adjustment assembly, the adjustment assembly comprising a driving gear, a driven rack, a first elastic member, and an adjustment knob, the driving gear being rotatably mounted on the mounting carrier, the two driven racks being respectively engaged with opposite sides of the driving gear, the first elastic member being disposed between the mounting carrier and the driving gear, and the adjustment knob being rotatably mounted on the mounting carrier; and

[0008] a clutch assembly, the clutch assembly comprising a worm wheel and a worm, the worm wheel being rotatably mounted on the mounting carrier and capable of driving the driving gear to rotate therewith, and the worm being in driving connection with the adjusting knob;

[0009] When the adjusting knob is rotated in a first direction, the worm can be moved to engage with the worm wheel to conduct the transmission of the adjusting knob to the driving gear; when the adjusting knob is rotated in a second direction opposite to the first direction, the worm can be moved to separate from the worm wheel to block the transmission of the adjusting knob to the driving gear.

[0010] Optionally, the clutch assembly further comprises a mounting bracket, the mounting bracket is rotatably mounted on the adjusting knob, and the worm is rotatably mounted on the mounting bracket;

[0011] When the adjusting knob is rotated in a first direction, the adjusting knob can drive the mounting bracket to rotate in the first direction, so that the worm is engaged with the worm wheel. When the worm and the worm wheel are engaged, the mounting bracket can be elastically deformed by the adjusting knob, so that the adjusting knob can rotate relative to the mounting bracket in the first direction.

[0012] When the adjusting knob is rotated in the second direction, the adjusting knob can drive the mounting bracket to rotate in the second direction, so as to separate the worm and the worm wheel.

[0013] Optionally, the mounting frame includes:

[0014] a frame body, one end of which is rotatably mounted on the adjusting knob and the other end of which is extended along the rotation axis of the worm; and

[0015] a support arm connected to the frame body and arranged at an angle thereto, the worm being rotatably mounted on the support arm;

[0016] The adjusting knob is provided with an abutment rib, and at least one of the abutment rib and the frame body is provided with a guide surface to guide the frame body to be abutted by the abutment rib and driven toward the worm to undergo elastic deformation when the worm and the worm wheel are engaged.

[0017] Optionally, the frame body and the abutting rib are defined to have a first side and a second side in sequence in the first direction, and the frame body and the abutting rib are both formed with the guide surface on the first side;

[0018] And / or, the guide surface is arranged as an inclined surface;

[0019] And / or, a groove is provided on a side of the frame body facing the worm;

[0020] And / or, the number of the abutment ribs is at least two, and the at least two abutment ribs are sequentially spaced and distributed around the rotation axis of the adjustment knob;

[0021] And / or, the frame body includes a first arm segment, a second arm segment and a third arm segment connected in sequence, the first arm segment and the second arm segment are both extended along the rotation axis of the worm, and the first arm segment is closer to the worm than the second arm segment; the third arm segment is connected between the first arm segment and the second arm segment, the support arm is connected to the first arm segment, and the second arm segment is rotatably provided on the adjustment knob at one end away from the first arm segment; when the worm and the worm wheel are engaged, the first arm segment can be abutted by the abutment rib and driven to undergo elastic deformation toward the worm.

[0022] Optionally, there are two support arms, the two support arms are arranged at a relative interval, and both ends of the worm are rotatably mounted on the two support arms respectively.

[0023] Optionally, a mounting hole is provided at one end of the worm gear away from the transmission connection to the adjusting knob, wherein the mounting hole is a strip-shaped hole structure and is extended along the direction of the worm gear toward the frame body;

[0024] The end of the worm gear away from the transmission connection to the adjusting knob passes through the mounting hole, and the mounting carrier is provided with a limiting cylinder, which extends around the rotation axis of the adjusting knob. The worm gear passing through the mounting hole abuts against the end of the limiting cylinder away from the mounting carrier.

[0025] Optionally, the adjusting knob is a cylindrical structure with an opening at one end, the end of the adjusting knob with the opening is rotatably sleeved on the outer side of the limiting cylinder, and the worm wheel, the worm and the mounting bracket are all arranged inside the adjusting knob;

[0026] The driving gear, the driven rack and the first elastic member are all arranged on a side of the mounting carrier away from the limiting cylinder, and a portion of the driving gear passes through the mounting carrier to engage with the worm gear.

[0027] Optionally, the mounting carrier is provided with a limiting rib, and when the mounting frame is driven by the adjusting knob rotating along the first direction until the worm is engaged with the worm wheel, the limiting rib abuts against the mounting frame to prevent the mounting frame from rotating along the first direction.

[0028] Optionally, the clutch assembly further includes a bevel gear set, wherein the bevel gear set includes a first bevel gear and a second bevel gear;

[0029] The first bevel gear is connected to one end of the worm, and the second bevel gear is connected to the adjusting knob and meshes with the first bevel gear, so that the worm is connected to the adjusting knob in a transmission manner.

[0030] The present invention also provides a wearable device comprising the telescopic adjustment mechanism described above.

[0031] When the telescopic adjustment mechanism of the technical solution of the present invention is applied to a wearable device, before the user needs to wear the device, the worm gear and worm in the clutch assembly are not engaged, so the transmission between the adjustment knob in the adjustment assembly and the driving gear is not connected, which means that the driving gear is in a free state that can rotate in both directions. Therefore, the user can directly adjust the extension of the strap member by pulling the two driven racks or the two strap members connected to the driven racks, so that the size of the wearing space enclosed by the strap member can be larger than the size of the user's wearing part (for example, the user's head), thereby facilitating the user to quickly and preliminarily wear the wearable device on the wearing part. After the pulling force acting on the two driven racks or the strap members is removed, the first elastic member undergoes elastic deformation due to the driving gear rotating with the two driven gears being pulled. Therefore, after the pulling force is removed, the first elastic member resets and drives the driving gear to rotate and reset. At this time, the driving gear drives the two driven racks toward each other during the reset process, achieving a preliminary tightening of the strap to initially adapt it to the human body for wear. To ensure that the wearable device is more stable to wear under a certain tightening force, the adjustment knob can be driven to rotate in a first direction, causing the clutch assembly to move the worm to engage with the worm wheel. The worm wheel is in turn transmission-connected to the driving gear, and the worm is in turn transmission-connected to the adjustment knob. Therefore, the transmission between the adjustment knob and the driving gear is now connected, and when the adjustment knob is driven to rotate in the first direction, the driving gear can also rotate in the first direction. The driving gear rotating in the first direction can further drive the two driven racks toward each other, achieving further tightening of the strap for a more stable wear. Furthermore, after the adjustment knob is stopped from rotating in the first direction, the worm wheel and worm can self-lock, so that the worm wheel will no longer rotate, and the driving gear transmission-connected to it is also fixed, thereby ensuring that the telescopic adjustment mechanism is stably fixed in the tightened state.

[0032] As can be seen from the above, the telescopic adjustment mechanism of this embodiment allows the user to initially adjust the size of the wearable device's wearing space by directly pulling the two driven racks or the straps connected to the driven racks, thereby quickly adjusting the wearable device to a preliminary fit for the user. After completing the preliminary adjustment, the adjustment knob is further rotated, and the clutch assembly transmits the transmission to the driving gear to further adjust the telescopic adjustment mechanism to a certain tightening force, thereby completing the secondary fine-tuning of the telescopic adjustment mechanism. This is compared to the telescopic adjustment mechanism of the prior art, which requires the user to continuously operate the adjustment knob, which is time-consuming and labor-intensive, to complete the entire telescopic adjustment process. During use, the adjustment mechanism of this embodiment has both preliminary adjustment and secondary fine-tuning. After the preliminary adjustment is completed, the telescopic adjustment mechanism is initially adapted to the human body. Therefore, the secondary fine-tuning only requires the user to rotate the adjustment knob for a short time (even less than one turn) to ensure that the telescopic adjustment mechanism has a certain contraction force. At this time, the initial adjustment and secondary fine-tuning processes are relatively simple and quick, and the user does not need to perform time-consuming and labor-intensive adjustment operations, which can improve the convenience of using the telescopic adjustment mechanism and thus enhance the user experience.

[0033] Furthermore, the clutch assembly in this application is also a combination of a worm gear and a worm, and the transmission between the worm gear and the worm gear has the advantages of being stable, reliable, and self-locking. Therefore, it can ensure that during the secondary fine-tuning process, the active gear can be stably and effectively driven by the adjustment knob. At the same time, when the driving force of the adjustment knob is canceled, the worm gear and the worm gear can self-lock in time, thereby ensuring that the telescopic adjustment mechanism is stably adjusted to the required tightening force and limited. Of course, this configuration of the clutch assembly also eliminates the need for an additional locking mechanism to lock the telescopic adjustment mechanism after the secondary fine-tuning.

[0034] In addition, when the wearable device needs to be removed, the adjustment knob can be driven to rotate in a second direction opposite to the first direction, driving the worm and worm wheel of the clutch assembly to separate, thereby blocking the transmission of the adjustment knob to the driving gear. At this time, the driving gear 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. It can be seen that 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 drive the driving gear to rotate in order to achieve the extension of the two driven racks away from each other, which further improves the convenience of using the telescopic adjustment mechanism in this solution and further enhances the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] 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.

[0036] Figure 1 This is a structural diagram of an embodiment of the telescopic adjustment mechanism of the present invention;

[0037] Figure 2 for Figure 1 A structural diagram of the telescopic adjustment mechanism from another perspective;

[0038] Figure 3 This is a schematic diagram of a state where the worm and worm wheel of the clutch assembly of the telescopic adjustment mechanism of the present invention are not engaged;

[0039] Figure 4 This is a schematic diagram of the worm and worm wheel of the clutch assembly of the telescopic adjustment mechanism of the present invention in a meshing state;

[0040] Figure 5 for Figure 1 A schematic diagram of an exploded structure of the telescopic adjustment mechanism from one perspective;

[0041] Figure 6 for Figure 5 Another perspective diagram of the explosion structure;

[0042] Figure 7 for Figure 6 A schematic diagram of a partial structure of the telescopic adjustment structure;

[0043] Figure 8 for Figure 7 An exploded structural diagram of a local structure of the telescopic adjustment structure;

[0044] Figure 9 for Figure 8 A schematic diagram of the structure of the clutch assembly of the telescopic adjustment mechanism;

[0045] Figure 10 for Figure 5 A schematic diagram of a partial structure of the telescopic adjustment mechanism;

[0046] Figure 11 for Figure 10 Another partial structural diagram of the telescopic adjustment mechanism.

[0047] Description of Figure Numbers:

[0048] Label name Label name 100 Telescopic adjustment mechanism 51 worm gear 10 Installation carrier 53 worm 11 Limiting cylinder 55 Mounting bracket 13 Limiting ribs 551 Frame body 30 Adjustment components 552 groove 31 driving gear 553 First arm section 33 Driven rack 554 Second arm section 35 first elastic member 555 The third arm section 37 Adjustment knob 556 Support arm 371 Abutment ribs 557 Mounting holes 373 Guide surface 57 Bevel gear set 375 Install the shaft 571 First bevel gear 50 Clutch components 573 Second bevel gear

[0049] 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

[0050] 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.

[0051] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) 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.

[0052] 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.

[0053] 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.

[0054] Please refer to Figures 1 to 4The 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, an adjustment assembly 30, and a clutch assembly 50. The adjustment assembly 30 includes a driving gear 31, a driven rack 33, a first elastic member 35, and an adjustment knob 37. The driving gear 31 is rotatably mounted 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 disposed between the mounting carrier 10 and the driving gear 31. The adjustment knob 37 is rotatably mounted on the mounting carrier 10. The clutch assembly 50 includes a worm gear 51 and a worm 53. The worm gear 51 is rotatably mounted on the mounting carrier 10 and can drive the driving gear 31. As the adjusting knob 37 rotates, the worm 53 is in transmission connection with the adjusting knob 37. When the adjusting knob 37 rotates in a first direction (which may be either clockwise or counterclockwise), the worm 53 can move to engage with the worm wheel 51, thereby conducting transmission of the adjusting knob 37 to the driving gear 31. When the adjusting knob 37 rotates in a second direction (which may be either clockwise or counterclockwise) opposite to the first direction, the worm 53 can move to separate from the worm wheel 51, thereby blocking transmission of the adjusting knob 37 to the driving gear 31.

[0055] The telescopic adjusting mechanism 100 described above can be used in a wearable device, which can be a head-mounted display device. The head-mounted display device can include a display host, a rear shell, and two strap members. The display host can be used to display an augmented display or a virtual display. The rear shell and the display host are arranged in a relative spaced manner. One end of each of the two strap members can be connected to opposite ends of the display host, and the other end of each of the two strap members can be slidably inserted into the two ends of the rear shell. At this time, the mounting carrier 10 in the telescopic adjusting mechanism 100 can be directly formed by a part of structure on the rear shell, or can be an additional mounting carrier 10 independent of the rear shell, which can be used to provide mounting positions for the adjusting assembly 30 and the clutch assembly 50, etc. Similarly, the two driven racks 33 in the telescopic adjusting mechanism 100 can also be directly formed by a part of structure on the two strap members, or can be two additional driven racks 33 independent of the two strap members, which can drive the two strap members to be tightened or elongated in the process of approaching each other. In some embodiments, the wearable device can also be a waist-mounted device. The waist-mounted device can include a main body (for example, a component for physical therapy or body shaping, etc.) and two strap members connected to the main body. At this time, the mounting carrier 10 and the main body can be arranged in a relative spaced manner, and the two strap members can be directly connected to the two driven racks 33. Therefore, the specific type of the device to which the telescopic adjusting mechanism 100 is applied is not limited in the present application, and any device that can be adjusted in a telescopic manner by similar two strap members can use the telescopic adjusting mechanism 100 in the present application. Further, the mounting carrier 10 in the telescopic adjusting mechanism 100 can be used to provide mounting positions, so that the components in the telescopic adjusting mechanism 100 can be assembled to form a whole. As described above, the mounting carrier 10 can be directly formed by a part of structure on the upper shell of the device to which the telescopic adjusting mechanism 100 is applied (for example, the rear shell of the head-mounted device); or can be a component independent of the shell, at this time, the mounting carrier 10 can be formed by a plurality of plates, or a plurality of columns, or a combination of a plurality of plates and a plurality of columns. The driving gear 31 in the adjusting assembly 30 can be used to mesh and drive the two driven racks 33, so that the two driven racks 33 can approach or move away synchronously, thereby ensuring the uniformity of the telescopic adjustment of the telescopic adjusting mechanism 100. The first elastic member 35 (which can be a spring or other elastic plastic member, etc., and can be a volute spring for easy installation) can drive the driving gear 31 to remain in a state where the two driven racks 33 are not stretched and adjusted. When the two driven racks 33 are not pulled for telescopic adjustment, the driving gear 31 is in a bidirectional free rotation state, so that the corresponding two driven racks 33 can approach each other and move away from each other.Therefore, the driving gear 31, the two driven racks 33, and the first elastic member 35 can be said to constitute a preliminary adjustment structure for adjusting the extension and contraction of the wearable device's strap. That is, at this time, the user can directly pull the two driven racks 33 or the strap connected to the driven racks 33 to make the two straps enclosed to form a wearing size larger than the wearing portion, making it easier to wear the wearable device. After wearing, the first elastic member 35 can drive the driving gear 31 to rotate and reset, thereby driving the two driven racks 33 to move closer to each other and reset, so that the two straps are initially tightened. The adjustment knob 37 can be used to provide an operating position for the user to perform a relatively simple rotation operation. That is, the clutch assembly 50 can be used to conduct the transmission of the adjustment knob 37. After the preliminary adjustment structure formed by the driving gear 31, the two driven racks 33, and the first elastic member 35 is adjusted, the adjustment knob 37 can be driven to rotate in the first direction for secondary fine-tuning. Specifically, the worm wheel 51 in the clutch assembly 50 can be used for transmission connection with the driving gear 31, and the worm 53 can be used for transmission connection with the adjustment knob 37. In this way, when the adjustment knob 37 is rotated in the first direction to drive the worm 53 to move to engage with the worm wheel 51, as shown. Figure 4The worm 53 is meshed with the worm wheel 51, allowing the adjusting knob 37 to drive the worm 53 to rotate, which in turn drives the worm wheel 51 to rotate, which in turn drives the driving gear 31 to rotate. This indirectly drives the driving gear 31, thereby causing the adjusting knob 37 to rotate in a first direction and thereby causing the two driven racks 33 to move closer together. The transmission connection between the worm wheel 51 and the driving gear 31 can be achieved by having the worm wheel 51 and the driving gear 31 coaxially or meshing with each other. The transmission connection between the worm 53 and the adjusting knob 37 can be achieved through a bevel gear set 57. For example, the bevel gear set 57 includes a first bevel gear 571 and a second bevel gear 573. The first bevel gear 571 is connected to one end of the worm 53, and the second bevel gear 573 is connected to the adjusting knob 37 and meshes with the first bevel gear 571, thereby providing a transmission connection between the worm 53 and the adjusting knob 37. At this time, the axes of the adjusting knob 37, the driving gear 31 and the worm wheel 51 can be arranged in a colinear manner, and the axis of the worm 53 can be arranged perpendicular to the axes of the adjusting knob 37, the driving gear 31 and the worm wheel 51, so that they can be distributed very compactly. Moreover, the transmission connection structure between the worm 53 and the adjusting knob 37 is not simple, which is conducive to improving the convenience of processing and manufacturing the telescopic adjustment mechanism 100. Of course, it should be noted that the present application is not limited to this. In other embodiments, the worm 53 and the adjusting knob 37 can also be connected by a coupling with dual output shafts. At this time, the coupling can have two vertically arranged output shafts, and one end of the two output shafts can be used to connect the worm 53 and the adjusting knob 37 respectively, and the other end can be connected by a similar bevel gear set 57.

[0056] When the telescopic adjustment mechanism 100 of the technical solution of the present invention is applied to a wearable device, before the user needs to wear the device, the worm wheel 51 and the worm 53 in the clutch assembly 50 are not engaged, so the transmission between the adjustment knob 37 in the adjustment assembly 30 and the driving gear 31 is not connected, which makes the driving gear 31 in a free state that can rotate in both directions. Therefore, at this time, the user can directly adjust the extension of the strap by pulling the two driven racks 33 or the two straps connected to the driven racks 33, so that the size of the wearing space enclosed by the straps can be larger than the size of the user's wearing part (e.g., the user's head), thereby facilitating the user to quickly and preliminarily wear the wearable device on the wearing part. After the pulling force acting on the two driven racks 33 or the straps is removed, the first elastic member 35 will elastically deform due to the driving gear 31 rotating with the two driven gears being pulled. Therefore, after the pulling force is removed, the first elastic member 35 will reset and drive the driving gear 31 to rotate and reset. At this time, the driving gear 31 will drive the two driven racks 33 to move closer to each other during the reset process, so that the strap is initially tightened to initially fit the wearer. In order to make the wearable device more stable under a certain tightening force, the adjustment knob 37 can be driven to rotate in the first direction so that the clutch assembly 50 moves to mesh with the worm gear 51 when the worm 53 is engaged. Figure 4 As shown, the worm wheel 51 is in transmission connection with the driving gear 31, and the worm 53 is in transmission connection with the adjusting knob 37. Therefore, the transmission between the adjusting knob 37 and the driving gear 31 is conducted at this time, and then when the adjusting knob 37 is driven to rotate in the first direction, the driving gear 31 can be driven to rotate in the first direction. The driving gear 31 rotating in the first direction can drive the two driven racks 33 closer to each other, so that the straps can be further tightened and worn more stably. Moreover, after the adjusting knob 37 is stopped from rotating in the first direction, the worm wheel 51 and the worm 53 can be self-locked, so that the worm wheel 51 will no longer rotate, and the driving gear 31 in transmission connection therewith is also limited and fixed, thereby ensuring that the telescopic adjustment mechanism 100 is stably limited in the tightened state.

[0057] As can be seen from the above, the telescopic adjustment mechanism 100 in this solution allows the user to first directly pull the two driven racks 33 or the straps connected to the driven racks 33 to achieve preliminary adjustment of the size of the wearing space of the wearable device during use, so as to quickly adjust the wearable device to a preliminary fit for the user. After completing the preliminary adjustment, the adjustment knob 37 is driven to rotate further, and the clutch assembly 50 is used to transmit the transmission to the driving gear 31 to further adjust the telescopic adjustment mechanism 100 to a certain tightening force, thereby completing the secondary fine-tuning of the telescopic adjustment mechanism 100. Compared with the telescopic adjustment mechanism 100 in the prior art, the user needs to continuously operate the adjustment knob 37, which is more time-consuming and labor-intensive, to complete the entire telescopic adjustment process. During use, the adjustment mechanism of this embodiment has both initial adjustment and secondary fine-tuning. After the initial adjustment is completed, the telescopic adjustment mechanism 100 is initially adapted to the human body. Therefore, during the secondary fine-tuning, the user only needs to rotate the adjustment knob 37 for a short time (even less than one turn) to ensure that the telescopic adjustment mechanism 100 can further exert a certain contraction force. In this case, both the initial adjustment and secondary fine-tuning processes are relatively simple and quick, eliminating the need for the user to perform time-consuming and laborious adjustment operations. This improves the convenience of using the telescopic adjustment mechanism 100 and enhances the user experience.

[0058] Furthermore, the clutch assembly 50 of the present application is also a combination of a worm gear 51 and a worm 53. The transmission between the worm gear 51 and the worm 53 is stable, reliable, and self-locking. Therefore, during the secondary fine-tuning process, the adjustment knob 37 can be used to stably and effectively drive the driving gear 31. At the same time, when the driving force of the adjustment knob 37 is removed, the worm gear 51 and the worm 53 can immediately self-lock, thereby ensuring that the telescopic adjustment mechanism 100 is stably adjusted to the desired tightening force and is limited in position. Of course, this configuration of the clutch assembly 50 also eliminates the need for an additional locking mechanism to lock the telescopic adjustment mechanism 100 after the secondary fine-tuning.

[0059] In addition, when the wearable device needs to be removed, the adjusting knob 37 can be driven to rotate in a second direction opposite to the first direction to drive the worm 53 and the worm wheel 51 of the clutch assembly 50 to separate. Figure 3When the adjusting knob 37 is rotated to the position shown in the figure, the transmission of the adjusting knob 37 to the driving gear 31 is blocked. At this time, the driving gear 31 is also unlocked again and can rotate freely in both directions, so that the user can directly pull the two driven racks 33 or the belt connected to the driven racks 33 to elongate the telescopic adjusting mechanism 100, thereby quickly achieving the removal of the wearable device. It can be seen that 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 the operation of rotating the driving adjusting knob 37 to drive the rotation of the driving gear 31 to achieve the elongation of the two driven racks 33 away from each other, thereby further improving the convenience of using the telescopic adjusting mechanism 100 in the present application, and further improving the user experience.

[0060] Please refer to Figure 3 , and Figures 5 to 9 In an embodiment of the present application, the clutch assembly 50 further comprises a mounting frame 55, the mounting frame 55 is rotatably arranged on the adjusting knob 37, and the worm 53 is rotatably mounted on the mounting frame 55; when the adjusting knob 37 is rotated in the first direction, the adjusting knob 37 can drive the mounting frame 55 to rotate in the first direction, so that the worm 53 is engaged with the worm gear 51, and when the worm 53 and the worm gear 51 are engaged, the mounting frame 55 can be elastically deformed by the adjusting knob 37 to drive the mounting frame 55 to rotate in the first direction. The adjusting knob 37 can rotate relative to the mounting frame 55 in the first direction; when the adjusting knob 37 is rotated in the second direction, the adjusting knob 37 can drive the mounting frame 55 to rotate in the second direction, so that the worm 53 and the worm gear 51 are separated.

[0061] In the embodiment, the worm 53 is installed on the mounting frame 55 rotatably connected to the adjusting knob 37, so that when the adjusting knob 37 is driven to rotate in the first direction, the mounting frame 55 can be driven to rotate, and the worm 53 installed on the mounting frame 55 can also be moved to engage with the worm gear 51. At this time, the driving between the adjusting knob 37 and the driving gear 31 is turned on. During the process of continuously driving the adjusting knob 37 to rotate in the first direction, the mounting frame 55 can be elastically deformed by the adjusting knob 37, so that the rotation of the adjusting knob 37 passes, and the adjusting knob 37 drives the driving gear 31 to rotate in the first direction through the worm 53 and the worm gear 51, so as to drive the two driven gears to further approach and tighten. It can be seen that during the adjustment process, the user only needs to rotate the adjusting knob 37, and the operation process is relatively simple, which is beneficial to further improve the convenience of the telescopic adjustment mechanism 100, and further improve the user experience. When the wearable device needs to be removed, the adjusting knob 37 is rotated in the second direction, and at this time the mounting frame 55 will not be elastically deformed by the adjusting knob 37, so that the mounting frame 55 can rotate with the adjusting knob 37, and the worm 53 and the worm gear 51 installed on the mounting frame 55 are separated. It can be seen that the operation of unlocking the wearable device at this time is also very simple, and only needs to drive the adjusting knob 37 to rotate in the second direction opposite to the first direction. In addition, it should be noted that the present application is not limited to this, and in other embodiments, the adjusting knob 37 can also include an outer knob and an inner rotating shaft rotatably arranged in the outer knob, and the worm 53 can be installed on the outer knob and connected to the inner rotating shaft through the combination of the first bevel gear 571 and the second bevel gear 573. At this time, the worm 53 can be moved to engage with the worm gear 51 by driving the outer knob to rotate, and then the worm 53 can be driven to rotate by driving the inner rotating shaft, so that the driving of the driving gear 31 is also possible.

[0062] Further, please refer to Figures 7 to 9 , the mounting frame 55 includes a frame body 551 and a support arm 556, one end of the frame body 551 is rotatably arranged on the adjusting knob 37, and the other end extends along the rotation axis of the worm 53; the support arm 556 is connected to the frame body 551 and is arranged at an angle with the frame body 551, and the worm 53 is rotatably installed on the support arm 556; the adjusting knob 37 is provided with an abutting rib 371, and at least one of the abutting rib 371 and the frame body 551 is provided with a guide surface 373, so that when the worm 53 and the worm gear 51 are engaged, the frame body 551 is driven to elastically deform towards the worm 53 by the abutting rib 371.

[0063] In this embodiment, since the mounting bracket 55 is rotatably mounted to the adjustment knob 37 via the bracket body 551 and the worm 53 is mounted via the support arm 556, different functions can be achieved through different locations of the mounting bracket 55. At this time, the abutment rib 371 of the adjustment knob 37, in cooperation with the guide surface 373, drives the bracket body 551 toward the worm 53 to undergo elastic deformation. This facilitates the adjustment knob 37 to rotate until the worm 53 and the worm wheel 51 mesh and further rotate relative to the mounting bracket 55 in the first direction. Since the worm 53 is mounted on the support arm 556, the elastic deformation of the mounting bracket 55 is less likely to affect the installation of the worm 53, thereby ensuring the normal and stable operation of the worm 53. Furthermore, since the axes of the driving gear 31, the worm wheel 51, and the adjustment knob 37 are parallel, if their axes are defined as vertical, the axis of the worm 53 can be horizontal. When the frame body 551 is abutted by the abutment rib 371, it is driven to undergo elastic deformation toward the worm 53, resulting in both the deformation direction of the frame body 551 and the extension direction of the abutment rib being vertical. This fully utilizes the space between the adjustment knob 37 and the worm 53, thereby improving space utilization efficiency. The guide surface 373 can be configured as an inclined surface to provide a very regular shape and facilitate molding. Of course, the guide surface 373 can also be configured as an arc. The guide surface 373 can be provided only on the abutment rib 371, or alternatively, only on the frame body 551. Alternatively, to enhance the convenience of the abutment rib 371 in driving the frame body 551 to undergo elastic deformation, the frame body 551 and the abutment rib 371 can be defined as having a first side and a second side, respectively, in a first direction. The frame body 551 and the abutment rib 371 can each be formed with a guide surface 373 on the first side. Of course, the frame body 551 can also be modified to force it to elastically deform toward the worm 53. For example, a groove 552 can be provided on the side of the frame body 551 facing the worm 53. In this case, the groove 552 can weaken the strength of the frame body 551 at this location compared to other locations. Consequently, when subjected to the compressive force applied by the abutment rib 371, the frame body 551 can be better forced to bend and deform at the groove 552. Furthermore, to improve the stability of the adjustment knob 37 during continued rotation after the worm 53 and worm wheel 51 are engaged, the number of abutment ribs 371 is at least two, and the at least two abutment ribs 371 are spaced apart around the rotation axis of the adjustment knob 37. In this case, each abutment rib 371 can be provided with a guide surface 373 on its first side to facilitate smooth passage of the abutment rib 371 through the frame body 551 during continued rotation of the adjustment knob 37 after the worm 53 and worm wheel 51 are engaged.Each abutment rib 371 can be set as a plane on the second side away from the first side, so that when the adjustment knob 37 is rotated along the second direction, it cannot drive the frame body 551 to undergo elastic deformation, and can drive the mounting frame 55 to rotate accordingly, thereby realizing the separation of the worm 53 and the worm wheel 51 installed on the mounting frame 55.

[0064] Further, please refer to Figure 3 、 Figure 8 as well as Figure 9 The frame body 551 includes a first arm segment 553, a second arm segment 554 and a third arm segment 555 connected in sequence. The first arm segment 553 and the second arm segment 554 are both extended along the rotation axis of the worm 53, and the first arm segment 553 is closer to the worm 53 than the second arm segment 554; the third arm segment 555 is connected between the first arm segment 553 and the second arm segment 554, the support arm 556 is connected to the first arm segment 553, and the end of the second arm segment 554 away from the first arm segment 553 is rotatably provided on the adjusting knob 37; when the worm 53 and the worm wheel 51 are engaged, the first arm segment 553 can be abutted by the abutting rib 371 and driven to elastically deform toward the worm 53.

[0065] In this embodiment, the frame body 551 is composed of a first arm segment 553, a second arm segment 554, and a third arm segment 555, which are connected in sequence to form a roughly "Z" shape. This allows the frame body 551 to be very close to the worm 53 via the first arm segment 553 and very close to the knob via the second arm segment 554, thereby facilitating the connection between the mounting frame 55, the worm 53, and the adjustment knob 37. This arrangement also allows for a more compact distribution of the components, thereby reducing the overall volume of the telescopic adjustment mechanism 100. The first arm segment 553 may be provided with the aforementioned groove 552 and guide surface 373 to facilitate elastic deformation of the first arm segment 553 by being abutted by the abutment rib 371 toward the worm 53. It should be noted that the present application is not limited to this embodiment; in other embodiments, the frame body 551 may also be a linear segment along the axis of the worm 53.

[0066] Please refer to Figures 7 to 9 In one embodiment of the present invention, there are two support arms 556 , which are arranged at a relative interval, and both ends of the worm 53 are rotatably mounted on the two support arms 556 .

[0067] In this embodiment, the number of support arms 556 is set to two, and the two support arms 556 can support the opposite ends of the worm 53, thereby improving the stability of the installation of the worm 53. At the same time, the number of support arms 556 is not excessive, so that the structure of the mounting frame 55 is greatly simplified.

[0068] Further, please refer to Figure 3 as well as Figures 7 to 10 A mounting hole 557 is provided at the end of the worm 53 away from the transmission connection to the adjusting knob 37. The mounting hole 557 is a strip-shaped hole structure and extends along the direction of the worm 53 toward the frame main body 551; the end of the worm 53 away from the transmission connection to the adjusting knob 37 passes through the mounting hole 557, and the mounting carrier 10 is provided with a limiting cylinder 11. The limiting cylinder 11 extends around the rotation axis of the adjusting knob 37, and the worm 53 passing through the mounting hole 557 abuts against the end of the limiting cylinder 11 away from the mounting carrier 10.

[0069] When the frame body 551 is squeezed and deformed by the abutment rib 371 of the adjustment knob 37, the elastic deformation can drive the support arm 556, located at the end of the frame body 551 that is connected to the adjustment knob 37 and away from the worm 53, to move toward the worm 53. Therefore, in this embodiment, the mounting hole 557 is configured as a strip-shaped hole. This allows the support arm 556, located at the end of the frame body 551 that is connected to the adjustment knob 37 and away from the worm 53, to move in response to the deformation of the frame body 551, thereby avoiding the worm 53. At this point, the support arm 556 with the mounting hole 557 is not supporting the worm 53. Therefore, to ensure the stability of the worm 53 during installation, the stopper 11 can be used to abut and support the end of the worm 53 that is connected to the adjustment knob 37.

[0070] Further, please refer to Figures 1 to 3 ,as well as Figure 10 and Figure 11 The adjusting knob 37 is a cylindrical structure with an opening at one end. The end of the adjusting knob 37 with the opening is rotatably sleeved on the outside of the limiting cylinder 11. The worm gear 51, the worm 53 and the mounting bracket 55 are all arranged inside the adjusting knob 37; the driving gear 31, the driven rack 33 and the first elastic member 35 are all arranged on the side of the mounting carrier 10 away from the limiting cylinder 11, and part of the structure of the driving gear 31 passes through the mounting carrier 10 to engage with the worm gear 51.

[0071] In this embodiment, the adjustment knob 37 is a cylindrical structure with an opening at one end. This allows the adjustment knob 37 to house and cover the worm gear 51, worm 53, mounting bracket 55, and bevel gear assembly 57, preventing them from being exposed and susceptible to damage, thereby improving the service life of the telescopic adjustment mechanism 100. By directly mounting the adjustment knob 37 on the retaining cylinder 11, the retaining bracket not only serves to abut and support the worm 53 but also serves to mount the adjustment knob 37, enabling the same structure to achieve multiple functions. This eliminates the need for different structures to achieve different functions, thereby simplifying the structure of the telescopic adjustment mechanism 100. By locating the driving gear 31, the driven rack 33, and the first elastic member 35 on the side of the mounting carrier 10 facing away from the retaining cylinder 11, the movement of the driven gear is not affected by the cover of the adjustment knob 37. At the same time, this arrangement also allows the components to fully utilize the space on opposite sides of the mounting carrier 10, thereby improving the compactness of the distribution of the various components in the telescopic adjustment mechanism 100. Furthermore, the wall surface of the adjustment knob 37 opposite its opening can be provided with a mounting shaft 375, and the frame body 551 of the mounting frame 55, the second arm section 554, and the second bevel gear 573 can be sequentially mounted on the mounting shaft 375 to further enhance the compactness of the installation.

[0072] Please refer to Figure 3 and Figure 4 In one embodiment of the present invention, the mounting carrier 10 is provided with a limiting rib 13. When the mounting frame 55 is driven by the adjusting knob 37 rotating along the first direction until the worm 53 engages with the worm wheel 51, the limiting rib 13 abuts against the mounting frame 55 to prevent the mounting frame 55 from rotating along the first direction.

[0073] In this embodiment, a limiting rib 13 is provided on the mounting carrier 10. When the mounting frame 55 follows the adjustment knob 37 and moves until the worm 53 engages the turbine, the limiting rib 13 abuts and limits the mounting frame 55, preventing it from continuing to rotate in the first direction following the adjustment knob 37. Thus, the mounting frame 55 is completely abutted, blocked, and limited by the limiting rib 13. This ensures that the worm 53 mounted on the mounting frame 55 is not affected by the driving force applied in the first direction by the adjustment knob 37 when engaging the turbine, thereby ensuring stable engagement between the worm 53 and the turbine. The abutting rib 371 can be used to abut and block the support arm 556, which is provided with the mounting hole 557.

[0074] In an embodiment of the present application, the use of the telescopic adjusting mechanism 100 in the present application can be as follows: when it is needed to wear the wearing device, the worm 53 and the worm wheel 51 in the clutch assembly 50 are not engaged, so that the worm wheel 51 and the driving gear 31 are in a state of bidirectional free rotation. At this time, the user can directly pull the two driven racks 33 or the strap connected to the driven racks 33, so that the strap can be elongated to enclose a wearing space with a larger size of the wearing part of the user, thereby facilitating the quick wearing. Then after the pulling force is removed, the first elastic member 35 will drive the driving gear 31 to rotate and reset under the action of the deformation elastic force, driving the two driven racks 33 to move closer to each other, thereby realizing that the strap can automatically and quickly complete the preliminary tightening. Then in order to improve the stability of the wearing device, the adjusting knob 37 can be driven to rotate in the first direction. The adjusting knob 37 can drive the mounting bracket 55 to rotate, so that the worm 53 mounted on the mounting bracket 55 can move to engage with the worm wheel 51. At this time, the transmission between the adjusting knob 37 and the driving gear is conducted. Moreover, after the worm 53 and the worm wheel 51 are engaged, the limiting rib 13 on the mounting carrier 10 abuts against the mounting bracket 55 to block the continuous rotation of the mounting bracket 55 in the first direction. At the same time, when the adjusting knob 37 continues to rotate in the first direction, the adjusting knob 37 can drive the first arm segment 553 of the bracket main body 551 of the mounting bracket 55 to elastically deform towards the worm 53 under the guidance of the guiding surface 373 of the abutting rib 371, so that the adjusting knob 37 can continue to rotate in the first direction relative to the mounting bracket 55, and drive the driving gear 31 to rotate in the first direction through the bevel gear set 57, the worm 53 and the worm wheel 51, realizing the further closing and tightening of the driven racks 33. Then when the tightening force required by the user is adjusted, the driving of the adjusting knob 37 is stopped, and the worm wheel 51 and the worm 53 can be self-locked, so that the telescopic adjusting mechanism 100 is limited and locked in the tightened state. Then when the wearing device needs to be removed, the adjusting knob 37 can be driven to rotate in the second direction. At this time, the adjusting knob 37 cannot drive the mounting bracket 55 to elastically deform through the abutting rib 371, so that the mounting bracket 55 can be driven by the abutting rib 371, thereby separating the worm 53 and the worm wheel 51. At this time, the worm wheel 51 and the driving gear 31 can again be bidirectionally freely rotated, so that the user can directly pull the two driven racks 33 or the strap to quickly remove the wearing device.

[0075] The present invention also provides a wearable device, which includes a telescopic adjustment mechanism 100. The specific structure of the telescopic adjustment mechanism 100 is referred to the above embodiments. Since the wearable device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described in detail 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 display host can be used to display an enhanced display image or a virtual display image, and the rear shell and the display host are arranged relative to each other. One end of the two straps can be connected to the opposite ends of the display host, and the other end can be slidably inserted into the ends of the rear shell. In this case, the mounting carrier 10 in the telescopic adjustment mechanism 100 can be directly formed by a part of the structure on the rear shell, or it can be an additional mounting carrier 10 provided independently of the rear shell, which can be used to provide a mounting position for the adjustment component 30 and the clutch component 50 to be installed. Similarly, the two driven racks 33 in the telescopic adjustment mechanism 100 can also be directly formed by a part of the structure on the two strap parts. Of course, they can also be two independent driven racks 33 additionally provided on the two strap parts, and drive the two strap parts to tighten or extend in the process of approaching each other. 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 shaping of the human body) and two strap parts connected to the main body. In this case, the mounting carrier 10 and the main body can be arranged at a relative interval, and the two strap parts can also be directly connected to the two driven racks 33.

[0076] 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; An adjustment assembly, the adjustment assembly comprising a driving gear, a driven rack, a first elastic member, and an adjustment knob, the driving gear being rotatably mounted on the mounting carrier, the two driven racks being respectively engaged with opposite sides of the driving gear, the first elastic member being disposed between the mounting carrier and the driving gear, and the adjustment knob being rotatably mounted on the mounting carrier; as well as a clutch assembly, the clutch assembly comprising a worm wheel and a worm, the worm wheel being rotatably mounted on the mounting carrier and capable of driving the driving gear to rotate therewith, and the worm being in driving connection with the adjusting knob; The axes of the adjusting knob, the driving gear and the worm wheel are arranged in parallel, and the axis of the worm is arranged perpendicular to the axis of the adjusting knob. When the adjusting knob is rotated in a first direction, the worm can be moved to engage with the worm wheel to conduct the transmission of the adjusting knob to the driving gear; when the adjusting knob is rotated in a second direction opposite to the first direction, the worm can be moved to separate from the worm wheel to block the transmission of the adjusting knob to the driving gear; The clutch assembly further includes a mounting bracket, the mounting bracket being rotatably mounted on the adjusting knob, and the worm being rotatably mounted on the mounting bracket; When the adjusting knob is rotated in a first direction, the adjusting knob can drive the mounting bracket to rotate in the first direction, so that the worm is engaged with the worm wheel. When the worm and the worm wheel are engaged, the mounting bracket can be elastically deformed by the adjusting knob, so that the adjusting knob can rotate relative to the mounting bracket in the first direction. When the adjusting knob is rotated in the second direction, the adjusting knob can drive the mounting bracket to rotate in the second direction, so as to separate the worm and the worm wheel; The mounting frame includes a frame body and a support arm, one end of the frame body is rotatably mounted on the adjustment knob, and the other end is extended along the rotation axis of the worm; the support arm is connected to the frame body and is arranged at an angle to the frame body, and the worm is rotatably mounted on the support arm; The adjusting knob is provided with an abutment rib, and at least one of the abutment rib and the frame body is provided with a guide surface to guide the frame body to be abutted by the abutment rib and driven toward the worm to undergo elastic deformation when the worm and the worm wheel are engaged.

2. The telescopic adjustment mechanism according to claim 1, wherein: It is defined that the frame body and the abutting rib have a first side and a second side in the first direction, and the frame body and the abutting rib are both formed with the guide surface on the first side; And / or, the guide surface is arranged as an inclined surface; And / or, a groove is provided on a side of the frame body facing the worm; And / or, the number of the abutment ribs is at least two, and the at least two abutment ribs are sequentially spaced and distributed around the rotation axis of the adjustment knob; And / or, the frame body includes a first arm segment, a second arm segment and a third arm segment connected in sequence, the first arm segment and the second arm segment are both extended along the rotation axis of the worm, and the first arm segment is closer to the worm than the second arm segment; the third arm segment is connected between the first arm segment and the second arm segment, the support arm is connected to the first arm segment, and the second arm segment is rotatably provided on the adjustment knob at one end away from the first arm segment; when the worm and the worm wheel are engaged, the first arm segment can be abutted by the abutment rib and driven to undergo elastic deformation toward the worm.

3. The telescopic adjustment mechanism according to claim 1, wherein: There are two support arms, which are arranged at a relative interval. Both ends of the worm are rotatably mounted on the two support arms.

4. The telescopic adjustment mechanism according to claim 3, wherein: A mounting hole is provided at one end of the worm gear away from the transmission connection to the adjusting knob, wherein the mounting hole is a strip-shaped hole structure and is extended along the direction of the worm gear toward the frame body; The end of the worm gear away from the transmission connection to the adjusting knob passes through the mounting hole, and the mounting carrier is provided with a limiting cylinder, which extends around the rotation axis of the adjusting knob. The worm gear passing through the mounting hole abuts against the end of the limiting cylinder away from the mounting carrier.

5. The telescopic adjustment mechanism according to claim 4, wherein: The adjusting knob is a cylindrical structure with an opening at one end. The end of the adjusting knob with the opening is rotatably sleeved on the outer side of the limiting cylinder. The worm wheel, the worm and the mounting bracket are all arranged inside the adjusting knob. The driving gear, the driven rack and the first elastic member are all arranged on a side of the mounting carrier away from the limiting cylinder, and a portion of the driving gear passes through the mounting carrier to engage with the worm gear.

6. The telescopic adjustment mechanism according to claim 1, wherein: The mounting carrier is provided with a limiting rib, and when the mounting frame is driven by the adjusting knob rotating in the first direction until the worm is engaged with the worm wheel, the limiting rib abuts against the mounting frame to prevent the mounting frame from rotating in the first direction.

7. The telescopic adjustment mechanism according to any one of claims 1 to 6, characterized in that: The clutch assembly further includes a bevel gear set, and the bevel gear set includes a first bevel gear and a second bevel gear; The first bevel gear is connected to one end of the worm, and the second bevel gear is connected to the adjusting knob and meshes with the first bevel gear, so that the worm is connected to the adjusting knob in a transmission manner.

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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