Head-mounted structure and head-mounted device

Abstract

The application discloses a head-mounted structure and a head-mounted device, wherein the head-mounted structure comprises a mounting shell, an unfolding and folding assembly, a pushing assembly and two binding belts, the mounting shell is provided with an inner ring gear; the unfolding and folding assembly comprises a driving wheel, a driven wheel and elastic arms arranged on the outer circumferential surface of the driven wheel, a driving gap is arranged between the driven wheel and the driving wheel, the driven wheel is connected with the first ends of the two binding belts to adjust the extension length of the binding belts; the driving wheel is drivingly connected with the pushing assembly; the driving wheel rotates to drive the pushing assembly to push the elastic arms, so that the elastic arms are separated from the inner ring gear, and when the driving wheel rotates through the driving gap, the driving wheel drives the driven wheel to rotate. The technical scheme of the application can reduce the noise in the length adjustment process of the head-mounted structure.

Description

Technical Field

[0001] This invention relates to the field of head-mounted device technology, and particularly to a head-mounted structure and head-mounted device. Background Technology

[0002] Virtual Reality (VR) technology is a hot topic in today's society. With the development of social productivity and science and technology, the demand for VR technology is growing rapidly across all industries. VR technology relies on head-mounted devices, which are therefore becoming increasingly widespread in daily life.

[0003] Traditional head-mounted devices typically require elastic mechanisms and ratchet-like abrupt changes in the strap length adjustment mechanism to achieve tightness adjustment and locking functions. This process generates significant noise, impacting the user experience. Summary of the Invention

[0004] The main objective of this invention is to provide a headband structure designed to reduce noise during the adjustment of the straps.

[0005] To achieve the above objectives, the present invention proposes a head-mounted structure comprising:

[0006] Two straps;

[0007] Mounting housing, wherein the mounting housing is provided with an internal gear ring;

[0008] An extension and retraction assembly, comprising a drive wheel, a driven wheel, and an elastic arm disposed on the outer circumference of the driven wheel, wherein a driving gap is provided between the driven wheel and the drive wheel, and the driven wheel is connected to the first ends of the two straps to adjust the extension length of the straps; and

[0009] A pushing assembly, wherein the driving wheel is drivenly connected to the pushing assembly;

[0010] The drive wheel rotates to drive the pushing assembly to push against the elastic arm, so that the elastic arm disengages from the internal gear ring. When the drive wheel rotates through the drive gap, the drive wheel drives the driven wheel to rotate.

[0011] Optionally, the pushing assembly includes a first pushing protrusion and a transmission member. The first pushing protrusion is disposed on a first side of the driving wheel, and the outer peripheral surface of the driven wheel is provided with a laterally protruding mounting portion. The transmission member is rotatably disposed at the free end of the mounting portion. The transmission member includes a first segment and a second segment disposed on opposite sides of the rotation position. The driving wheel rotates in a first direction to drive the first pushing protrusion to push against the first segment, thereby driving the second segment to push against the elastic arm.

[0012] Optionally, the pushing surface of the second segment is curved.

[0013] Optionally, the pushing assembly further includes a reset member disposed between the mounting portion and the transmission member, so that the transmission member can be restored to its original state.

[0014] Optionally, the pushing assembly further includes a second pushing protrusion disposed on a first side of the drive wheel, the second pushing protrusion contacting the front sidewall of the elastic arm in the first direction, and the drive wheel rotating in the second direction to drive the second pushing protrusion to push the elastic arm.

[0015] Optionally, the elastic arm includes an arm body connected to the driven wheel and a pushing protrusion protruding from the side of the arm body away from the driving wheel, the second pushing protrusion pushing against the arm body, and the second section of the transmission member pushing against the pushing protrusion.

[0016] Optionally, the first side of the driving wheel is provided with a trigger groove, the outer peripheral surface of the driven wheel is provided with a driven protrusion, the driven protrusion extends into the trigger groove, and the driving gap is provided between the side wall of the trigger groove in the rotation direction of the driven protrusion and the driven protrusion.

[0017] Optionally, the first side of the drive wheel is provided with two trigger ribs spaced apart, and the two trigger ribs are located in the rotation direction of the driven protrusion to form the trigger groove between the two trigger ribs.

[0018] Optionally, the free end of the elastic arm is set at a sharp angle, and the free end of the elastic arm engages with the tooth groove of the internal gear ring.

[0019] Optionally, the outer peripheral surface of the driven wheel away from the driving wheel is provided with a transmission tooth, and the extension and retraction assembly further includes two racks provided at the first ends of the two straps. The two racks respectively mesh with the opposite sides of the transmission tooth. The racks are slidably connected to the mounting shell, and the sliding direction of the racks is parallel to the extension direction of the straps.

[0020] Optionally, the mounting housing has an opening through which the drive wheel passes and protrudes from the side wall of the mounting housing.

[0021] The present invention also proposes a head-mounted device, including the head-mounted structure described above.

[0022] The aforementioned headgear structure includes at least the following beneficial effects:

[0023] The technical solution of this invention employs a head-mounted structure including a mounting shell, an extension / retraction assembly, a push-off assembly, and two straps. The mounting shell is provided with an internal gear ring. The extension / retraction assembly includes a drive wheel, a driven wheel, and an elastic arm disposed on the outer circumference of the driven wheel. A drive gap is provided between the driven wheel and the drive wheel. The driven wheel is connected to the first end of the two straps to adjust the extension length of the straps. The drive wheel is driven to the push-off assembly to push the elastic arm. The drive wheel rotates to drive the push-off assembly to push the elastic arm, so that the elastic arm disengages from the internal gear ring. When the drive wheel rotates past the drive gap, the drive wheel drives the driven wheel to rotate. Specifically, when the extension length of the strap needs to be adjusted, the user drives the drive wheel to rotate. This rotation causes the pusher component to push against the elastic arm, resulting in elastic deformation and disengagement from the inner gear ring. The drive wheel continues to rotate, and the pusher component continues to push against the elastic arm, keeping it disengaged from the inner gear ring. When the drive wheel passes the drive gap, it drives the driven wheel to rotate, thereby moving the strap connected to the driven wheel and adjusting its length. Because the elastic arm remains disengaged from the inner gear ring during this process, it does not repeatedly collide with the teeth of the inner gear ring during the strap length adjustment operation, thus avoiding impact noise and reducing noise during headband length adjustment. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of one embodiment of the head-mounted structure of the present invention;

[0026] Figure 2 for Figure 1 A magnified view of a section at point A in the middle;

[0027] Figure 3 This is an exploded structural diagram of the headgear structure of the present invention;

[0028] Figure 4 for Figure 3 A magnified view of a section at point B in the middle;

[0029] Figure 5 This is a cross-sectional view of the headgear structure of the present invention.

[0030] Explanation of icon numbers:

[0031]

[0032]

[0033] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0035] 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 positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indication will also change accordingly.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] This invention proposes a head-mounted structure.

[0039] Reference Figure 1 and Figure 2In one embodiment of the present invention, the headband structure includes a mounting shell 100, an extension / retraction assembly 200, a push-off assembly 300, and two straps. The mounting shell 100 is provided with an internal gear ring 110. The extension / retraction assembly 200 includes a drive wheel 210, a driven wheel 220, and an elastic arm 230 disposed on the outer peripheral surface of the driven wheel 220. A drive gap 240 is provided between the driven wheel 220 and the drive wheel 210. The driven wheel 220 is connected to the first end of the two straps to adjust the extension length of the straps. The drive wheel 210 is driven to the push-off assembly 300 to push the elastic arm 230. The drive wheel 210 rotates to drive the push-off assembly 300 to push the elastic arm 230, so that the elastic arm 230 disengages from the internal gear ring 110. When the drive wheel 210 rotates through the drive gap 240, the drive wheel 210 drives the driven wheel 220 to rotate.

[0040] Specifically, when the extension length of the strap needs to be adjusted, the user drives the drive wheel 210 to rotate. This rotation causes the push component 300 to push against the elastic arm 230, resulting in elastic deformation of the elastic arm 230 and disengaging it from the inner gear ring 110. The drive wheel 210 continues to rotate, and the push component 300 continues to push against the elastic arm 230, keeping it disengaged from the inner gear ring 110. When the drive wheel 210 passes the drive gap 240, it drives the driven wheel 220 to rotate, thereby moving the strap connected to the driven wheel 220 and adjusting its length. Because the elastic arm 230 remains disengaged from the inner gear ring 110 during this process, it does not repeatedly collide with the teeth of the inner gear ring 110 during the strap length adjustment movement of the drive wheel 210, thus avoiding impact noise from the elastic arm 230 and reducing noise during the headband length adjustment process.

[0041] It should be noted that when the strap is adjusted to the required length, the user's force is removed from the drive wheel 210, and the pushing force of the pushing component 300 on the elastic arm 230 is also removed. Therefore, the elastic arm 230 returns to its original state under the action of its own elastic restoring force, thereby locking into the corresponding tooth groove of the inner tooth ring 110, realizing the locking of the extension and retraction component 200, and thus locking the length of the strap, increasing the stability of the strap length.

[0042] Secondly, in the process of adjusting the strap, this solution only requires continuously rotating the drive wheel 210 to adjust the length of the strap, without any other steps, making it simple and convenient for users.

[0043] Reference Figures 2 to 4Optionally, the pushing assembly 300 includes a first pushing protrusion 310 and a transmission member 320. The first pushing protrusion 310 is disposed on the first side of the driving wheel 210, and the outer peripheral surface of the driven wheel 220 is provided with a laterally protruding mounting portion 221. The transmission member 320 is rotatably disposed at the free end of the mounting portion 221. The transmission member 320 includes a first segment 321 and a second segment 322 disposed on opposite sides of the rotational position. The driving wheel 210 rotates in a first direction to drive the first pushing protrusion 310 to push against the first segment 321 of the transmission member 320, thereby driving the second segment 322 of the transmission member 320 to push against the elastic arm 230. Specifically, the first segment 321 of the transmission member 320 is located in the direction in which the first pushing protrusion 310 moves in the first direction. The drive wheel 210 rotates in the first direction, and the first abutting protrusion 310 on the first side of the drive wheel 210 also rotates in the first direction, thereby abutting the first section 321 of the transmission member 320, causing the transmission member 320 to rotate. At this time, the second section 322 of the transmission member 320 abuts the elastic arm 230, thereby causing the elastic arm 230 to undergo elastic deformation, so that the elastic arm 230 disengages from the internal gear ring 110. Then, the drive wheel 210 continues to rotate in the first direction. When the drive wheel 210 rotates through the drive gap 240, the drive wheel 210 will drive the driven wheel 220 to rotate, thereby driving the strap to run, thereby adjusting the length of the strap. It can be seen that such a pusher assembly 300 has a simple structure and is easy to transmit.

[0044] Of course, the present invention is not limited to this. In other embodiments, the pushing assembly 300 includes a pushing rod and a linkage. The outer peripheral surface of the driven wheel 220 is provided with a laterally protruding mounting arm. The linkage is rotatably disposed at the free end of the mounting arm. The linkage includes a first end and a second end disposed on opposite sides of the rotation position. The first end of the linkage is provided with a guide groove. The length direction of the guide groove extends radially toward the driving wheel 210. The pushing rod is disposed on the first side of the driving wheel 210 and movably passes through the guide groove. The driving wheel 210 rotates in the first direction to drive the pushing rod to slide along the guide groove. At this time, the groove wall of the guide groove will be pushed by the pushing rod to drive the second end of the linkage to push the elastic arm 230.

[0045] In this design, the abutting surface of the second segment 322 is arc-shaped. This reduces the hard friction between the second segment 322 of the transmission member 320 and the elastic arm 230, thereby reducing wear on both. Since wear can shorten the length of the second segment 322 or cause the contact area between the elastic arm 230 and the abutting surface of the second segment 322 to become concave, making the abutting surface of the second segment 322 arc-shaped ensures a sufficient distance for the second segment 322 to abut the elastic arm 230. This reduces the likelihood of the second segment 322 failing to abut the elastic arm 230 and becoming dislodged from the tooth groove of the internal gear ring 110 after long-term use, thus increasing the service life of the headgear structure. However, this invention is not limited to this; in other embodiments, the abutting surface of the second segment 322 is planar.

[0046] Reference Figure 4 and Figure 5 Optionally, the pushing assembly 300 further includes a reset member 330, which is disposed between the mounting portion 221 and the transmission member 320 to allow the transmission member 320 to return to its original state. The reset member 330 facilitates the transmission member 320's return to its original state before it pushes against the elastic arm 230, preventing the elastic arm 230 from failing to push against the second segment 322 of the transmission member 320 due to its own elastic restoring force when the user's driving force is removed, thus reducing the likelihood that the elastic arm 230 will not be able to return to the state of engagement with the internal gear ring 110. Of course, the present invention is not limited to this. In other embodiments, the pushing assembly 300 may not include a reset member 330. When the user's driving force is removed, the elastic arm 230 uses its own elastic restoring force to drive the second segment 322 of the transmission member 320 in the opposite direction, thereby restoring the state of engagement with the internal gear ring 110.

[0047] Furthermore, in this embodiment, the reset member 330 is configured as a torsion spring. This is because the torsion spring is made of a high-strength alloy material, which has high durability and stability, and can increase the service life of the reset member 330. In the second embodiment, the reset member 330 can also be configured as a spring or an elastic sheet.

[0048] Furthermore, the push assembly 300 also includes a second push protrusion 340 disposed on the first side of the drive wheel 210. The second push protrusion 340 contacts the front sidewall of the elastic arm 230 in the first direction. The drive wheel 210 rotates in the second direction to drive the second push protrusion 340 to push the elastic arm 230. Specifically, when the user drives the drive wheel 210 to rotate in the second direction, the second push protrusion 340 disposed on the first side of the drive wheel 210 will also rotate in the second direction, thereby pushing the elastic arm 230 located in the second direction of the second push protrusion 340, causing the elastic arm 230 to elastically avoid, thereby causing the elastic arm 230 to disengage from the internal gear ring 110. Then, the drive wheel 210 continues to rotate in the second direction. When the drive wheel 210 rotates through the drive gap 240, the drive wheel 210 will drive the driven wheel 220 to rotate, thereby driving the strap to run, thereby adjusting the length of the strap.

[0049] It should be noted that the two directions are opposite to each other. In this embodiment, the first direction is clockwise and the second direction is counterclockwise. Of course, the invention is not limited to this; in other embodiments, the first direction may also be counterclockwise and the second direction may be clockwise.

[0050] Furthermore, the elastic arm 230 includes an arm body 231 connected to the driven wheel 220, and a pushing protrusion 232 protruding from the side of the arm body 231 away from the driving wheel 210. The second pushing protrusion 340 pushes against the arm body 231, and the second section 322 of the transmission member 320 pushes against the pushing protrusion 232. This not only ensures the elasticity of the elastic arm 230, but also makes the structure of the elastic arm 230 more compact and reduces the weight of the strap structure. Of course, the present invention is not limited to this. In other embodiments, the overall height of the elastic arm 230 can be increased, the second pushing protrusion 340 pushes against the side of the elastic arm 230 close to the first side of the driving wheel 210, and the second section 322 of the transmission member 320 pushes against the side of the elastic arm 230 away from the first side of the driving wheel 210.

[0051] Optionally, the first side of the driving wheel 210 is provided with a trigger groove, and the outer peripheral surface of the driven wheel 220 is provided with a driven protrusion 223. The driven protrusion 223 extends into the trigger groove, and the driving gap 240 is provided between the side wall of the trigger groove in the rotation direction of the driven protrusion 223 and the driven protrusion 223. Such a driving gap 240 is simple to form and easy to process.

[0052] It should be noted that when the drive wheel 210 rotates, the wall of the trigger groove also rotates, causing the driven protrusion 223 to rotate within the drive gap 240. During the rotation of the driven protrusion 223 before it contacts the wall of the trigger groove, the pushing component 300 pushes the elastic arm 230 to deform, thereby disengaging from the internal gear ring 110. When the driven protrusion 223 rotates to the end of the drive gap 240, that is, after the driven protrusion 223 contacts the wall of the trigger groove, the drive wheel 210 continues to rotate in the original direction. The wall of the trigger groove pushes against the driven protrusion 223, thereby driving the driven wheel 220 to rotate, thus achieving the adjustment of the strap length.

[0053] Of course, the present invention is not limited to this. In other embodiments, a sector-shaped groove can be provided on the wheel body of the driven wheel 220. The length direction of the sector-shaped groove extends along the circumference of the driven wheel 220. The driving wheel 210 is provided with a driving protrusion corresponding to the sector-shaped groove. The driving protrusion passes through the sector-shaped groove. The driving gap 240 is formed between the driving protrusion and the groove wall of the sector-shaped groove in the first and second directions. When the driving wheel 210 rotates, it drives the driving protrusion to rotate in the sector-shaped groove. At this time, the pushing component 300 will push the elastic arm 230 to deform, thereby disengaging from the internal gear ring 110. After the driving protrusion contacts the groove wall of the sector-shaped groove, the driving wheel 210 continues to rotate in the original direction. The driving protrusion will push the groove wall of the sector-shaped groove, thereby driving the driven wheel 220 to rotate, so as to realize the adjustment of the strap length.

[0054] Furthermore, the first side of the drive wheel 210 is provided with two phase-spaced trigger ribs 211, which are located in the rotation direction of the driven protrusion 223, so as to form a trigger groove between the two trigger ribs 211. Such a trigger groove is simple to form and easy to process.

[0055] Specifically, in this embodiment, the free end of the elastic arm 230 is set with a sharp angle, and the free end of the elastic arm 230 engages with the tooth groove of the internal gear ring 110. It can be understood that setting the free end of the elastic arm 230 with a sharp angle makes it easier for the two side walls of the free end to form guiding slopes, guiding the free end of the elastic arm 230 into the tooth groove of the internal gear ring 110. Of course, the present invention is not limited to this. In other embodiments, the free end of the elastic arm 230 may also be provided with multiple locking teeth, which engage with the tooth groove of the internal gear ring 110.

[0056] Optionally, the outer peripheral surface of the driven wheel 220 away from the driving wheel 210 is provided with a transmission tooth 222. The unfolding and retracting assembly 200 also includes two racks 250 disposed at the first ends of the two straps. The two racks 250 respectively mesh with the opposite sides of the transmission tooth 222. The racks 250 are slidably connected to the mounting housing 100, and the sliding direction of the racks 250 is parallel to the extension direction of the straps. Such an unfolding and retracting assembly 200 has a simple structure, runs smoothly, and can increase the stability of the strap operation. Of course, the present invention is not limited to this. In some other embodiments, the driven wheel 220 can also be configured as a synchronous wheel, and the first ends of the two straps are wound onto the synchronous wheel in the same direction. When the synchronous wheel rotates, synchronous winding or retracting can be achieved, thereby realizing the length adjustment of the two straps.

[0057] Specifically, in this embodiment, when the user needs to increase the wearing length of the strap, the drive wheel 210 can be rotated clockwise. The drive wheel 210 drives the first abutting protrusion 310 to push against the first section 321 of the transmission member 320, thereby causing the second section 322 of the transmission member 320 to push against the elastic arm 230, causing the elastic arm 230 to undergo elastic deformation and disengage from the internal gear ring 110, continuing to drive the drive wheel 210 to rotate clockwise until the groove wall of the drive groove and the driven protrusion 22... After contact, the drive wheel 210 continues to rotate clockwise. At this time, the groove wall of the drive groove will push against the driven protrusion 223, thereby enabling the drive wheel 210 to drive the driven wheel 220 to rotate clockwise. Since the two racks 250 mesh with the opposite sides of the transmission teeth 222 on the driven wheel 220, while the driven wheel 220 rotates clockwise, it will also drive the two racks 250 to run in a direction away from each other, ultimately achieving the increase in the wearing length of the strap.

[0058] Similarly, when the user needs to shorten the wearing length of the strap, the drive wheel 210 can be rotated counterclockwise. The drive wheel 210 drives the second abutting protrusion 340 to push against the elastic arm 230, causing the elastic arm 230 to undergo elastic deformation and disengage from the inner gear ring 110. The drive wheel 210 continues to be driven to rotate counterclockwise until the groove wall of the drive groove contacts the driven protrusion 223. Then the drive wheel 210 continues to be driven to rotate counterclockwise. At this time, the groove wall of the drive groove will push against the driven protrusion 223, thereby realizing that the drive wheel 210 drives the driven wheel 220 to rotate counterclockwise. Since the two racks 250 are respectively engaged with the opposite sides of the transmission teeth 222 on the driven wheel 220, when the driven wheel 220 rotates counterclockwise, it will also drive the two racks 250 to move towards each other, ultimately shortening the wearing length of the strap.

[0059] In other embodiments, the driving wheel 210 can be rotated clockwise, thereby driving the driven wheel 220, which in turn drives the two racks 250 to move closer to each other, ultimately shortening the strap length. Conversely, rotating the driving wheel 210 counterclockwise drives the driven wheel 220, which in turn drives the two racks 250 to move further apart, ultimately increasing the strap length.

[0060] Reference Figure 1 and Figure 3 Optionally, the mounting housing 100 is provided with an opening through which the drive wheel 210 partially passes and protrudes from the side wall of the mounting housing 100. This allows the user to directly drive the drive wheel 210 through the part of the drive wheel 210 protruding from the side wall of the mounting housing 100. This driving method has a simple structure and is easy to drive.

[0061] It should be noted that the insertion opening is located on the side wall of the mounting housing 100, perpendicular to the direction from the user's head to the mounting housing 100. That is, by placing the trigger portion of the drive wheel 210 on the side of the mounting housing 100, the overall thickness of the mounting housing 100 and the extension / retraction assembly 200 is reduced, increasing the user's comfort when using the head-mounted device while lying down. Of course, the invention is not limited to this. In other embodiments, a knob can also be provided, located on the side of the drive wheel 210 opposite to the driven wheel 220. The user can rotate the knob to drive the driven wheel 220 to rotate in a first or second direction.

[0062] The present invention also proposes a head-mounted device, which includes a head-mounted structure. The specific structure of the head-mounted structure is as described in the above embodiments. Since the head-mounted device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0063] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A head-mounted structure, characterized in that, include: Two straps; Mounting housing, wherein the mounting housing is provided with an internal gear ring; The retractable assembly includes a drive wheel, a driven wheel, and an elastic arm disposed on the outer circumferential surface of the driven wheel. A drive gap is provided between the driven wheel and the drive wheel. The driven wheel is connected to the first end of the two straps to adjust the extension length of the straps. as well as A pushing assembly, wherein the driving wheel is drivenly connected to the pushing assembly; The drive wheel rotates to drive the pushing assembly to push against the elastic arm, so that the elastic arm disengages from the internal gear ring. When the drive wheel rotates through the drive gap, the drive wheel drives the driven wheel to rotate. The driving wheel has a trigger groove on its first side, and the driven wheel has a driven protrusion on its outer circumferential surface. The driven protrusion extends into the trigger groove, and the driving gap is located between the side wall of the trigger groove in the rotation direction of the driven protrusion and the driven protrusion. Alternatively, the driven wheel has a fan-shaped groove on its body, the length of which extends along the circumference of the driven wheel. The driving wheel has a driving protrusion corresponding to the fan-shaped groove, the driving protrusion passing through the fan-shaped groove, and the driving gap is formed between the side wall of the fan-shaped groove in the rotation direction of the driving protrusion and the driving protrusion.

2. The head-mounted structure as described in claim 1, characterized in that, The pushing assembly includes a first pushing protrusion and a transmission member. The first pushing protrusion is disposed on a first side of the driving wheel. The outer peripheral surface of the driven wheel is provided with a laterally protruding mounting portion. The transmission member is rotatably disposed at the free end of the mounting portion. The transmission member includes a first segment and a second segment disposed on opposite sides of the rotation position. The driving wheel rotates in a first direction to drive the first pushing protrusion to push against the first segment, thereby driving the second segment to push against the elastic arm.

3. The head-mounted structure as described in claim 2, characterized in that, The second segment's pushing surface is curved; and / or The pushing assembly also includes a reset member, which is disposed between the mounting part and the transmission member to restore the transmission member to its original state.

4. The head-mounted structure as described in claim 2, characterized in that, The pushing assembly further includes a second pushing protrusion disposed on a first side of the drive wheel. The second pushing protrusion contacts the front sidewall of the elastic arm in the first direction. The drive wheel rotates in the second direction to drive the second pushing protrusion to push the elastic arm.

5. The head-mounted structure as described in claim 4, characterized in that, The elastic arm includes an arm body connected to the driven wheel and a pushing protrusion protruding from the side of the arm body away from the driving wheel. The second pushing protrusion pushes against the arm body, and the second section of the transmission member pushes against the pushing protrusion.

6. The head-mounted structure as described in claim 1, characterized in that, The first side of the drive wheel is provided with two trigger ribs spaced apart, and the two trigger ribs are located in the rotation direction of the driven protrusion to form the trigger groove between the two trigger ribs.

7. The head-mounted structure as described in claim 1, characterized in that, The free end of the elastic arm is set at a sharp angle, and the free end of the elastic arm engages with the tooth groove of the internal gear ring.

8. The head-mounted structure as described in any one of claims 1 to 7, characterized in that, The driven wheel has a transmission tooth on its outer peripheral surface at the end furthest from the driving wheel. The extension / retraction assembly also includes two racks located at the first ends of the two straps. The two racks mesh with opposite sides of the transmission tooth. The racks are slidably connected to the mounting housing, and the sliding direction of the racks is parallel to the extension direction of the straps; and / or The mounting housing has an opening, through which the drive wheel portion passes and protrudes from the side wall of the mounting housing.

9. A head-mounted device, characterized in that, Includes the head-mounted structure as described in any one of claims 1 to 8.

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