CN219799893U - Bandage adjustment mechanism and head-mounted equipment - Google Patents

Abstract

The utility model belongs to the technical field of head-mounted display, and particularly relates to a binding band adjusting mechanism and head-mounted equipment; the binding band adjusting mechanism comprises a shell, a gear structure, a first clamping tooth and a second clamping tooth, an elastic structure, a pressing block structure, a key and a driving rack, wherein the first clamping tooth and the second clamping tooth are respectively arranged at two opposite sides of the gear structure in a sliding mode, the elastic structure is used for enabling the first clamping tooth and the second clamping tooth to be meshed with the gear structure, the pressing block structure is arranged in a cavity in a sliding mode along the radial direction of the gear structure, a sliding surface perpendicular to the radial direction of the gear structure is arranged on the pressing block structure, a long through hole is correspondingly formed in the shell, and the driving rack is arranged between the sliding surface and the long through hole and extends to the outer side of the shell; the head-wearing equipment comprises a host machine, a left binding belt, a left rack, a right binding belt, a right rack and a binding belt adjusting mechanism, wherein the left rack and the right rack are respectively inserted into the cavity to be meshed with the upper side and the lower side of the gear structure for transmission. The problem of current head-mounted equipment's bandage adjustment mechanism's structure complicacy and adjust inconvenient is solved.

Description

Bandage adjustment mechanism and head-mounted equipment

Technical Field

The utility model belongs to the technical field of head-mounted display, and particularly relates to a binding band adjusting mechanism and head-mounted equipment.

Background

With the development of technology, VR headsets, AR headsets, and the like are increasingly appearing in daily life. The head-mounted device is fixed on the head of the user through a strap structure, and in general, the length of the strap structure can be adjusted according to needs so as to adapt to the head circumference of different users.

At present, the bandage structure of the head-mounted device is mainly characterized in that the length of the bandage structure is adjusted by matching a gear, a rack and an adjusting wheel, one-way locking is realized through a ratchet pawl mechanism, the bandage structure is limited at the position to be adjusted, and the corresponding adjustment can be performed only by separating a pawl from a ratchet when the bandage is loosened, so that the structure is complex and the adjustment is very inconvenient.

Disclosure of Invention

The utility model aims to provide a binding band adjusting mechanism and head-mounted equipment, and aims to solve the problems that the structure of the binding band adjusting mechanism of the existing head-mounted equipment is complex and the adjustment is inconvenient.

The utility model discloses a binding band adjusting mechanism, which comprises a shell, a gear structure rotatably arranged in a cavity surrounded by the shell, a first latch and a second latch respectively arranged at two opposite sides of the gear structure in a sliding way, an elastic structure used for enabling the first latch and the second latch to be meshed with the corresponding sides of the gear structure, and a pressing block structure arranged in the cavity in a sliding way along the radial direction of the gear structure and used for pushing the first latch and the second latch to be separated from the gear structure, wherein a sliding surface perpendicular to the radial direction of the gear structure is arranged at one side of the pressing block structure far away from the gear structure, and a long through hole is arranged at the position corresponding to the sliding surface on the shell; the sliding surface is arranged between the sliding surface and the long through hole, the sliding surface can penetrate through the long through hole to extend to the outer side of the shell, the sliding surface is fixedly connected with the key, and the driving rack is meshed with the gear structure after the key is pressed.

As an improvement, the sliding directions of the first latch and the second latch are parallel to the sliding surface, and latch sliding connection structures are respectively arranged between the first latch, the second latch and the inner side wall of the shell; the sliding direction of the pressing block structure is perpendicular to the sliding direction of the first clamping tooth and the second clamping tooth, and a pressing block sliding connection structure is arranged between the pressing block structure and the inner side wall of the shell.

As an improvement, the first latch and the second latch respectively comprise a body part and a tooth part arranged at one side of the body part close to the gear structure; the latch sliding connection structure comprises a latch chute arranged on the body part along the sliding direction of the first latch and the second latch, and a latch plug connector which is fixed on the inner side wall of the shell and inserted into the latch chute, and two ends of the latch chute are closed.

As an improvement, the briquetting sliding connection structure comprises a briquetting chute arranged on the briquetting structure along the sliding direction of the briquetting structure, and a briquetting plug connector fixed on the inner side wall of the shell and inserted into the briquetting chute, wherein two ends of the briquetting chute are closed.

As an improvement, the pressing block structure is provided with a pushing part between the first latch and the second latch, and two sides of the pushing part corresponding to the first latch and the second latch are respectively provided with a first pushing inclined plane and a second pushing inclined plane.

As an improvement, a first retaining wall and a second retaining wall are respectively formed on the side edges of the pushing part corresponding to the first pushing inclined surface and the second pushing inclined surface, the first clamping teeth are clamped between the first retaining wall and the inner side wall of the shell on the corresponding side, and the second clamping teeth are clamped between the second retaining wall and the inner side wall of the shell on the corresponding side.

As an improvement, the elastic structure is an elastic telescopic piece connected between the first latch and the second latch.

As an improvement, a carrier plate is arranged between the sliding surface and the long through hole, and the key is fixedly connected with the carrier plate; one side of the carrier plate, which is close to the gear structure, is fixed with a mounting plate, and the driving rack is arranged on the side edge of the mounting plate, which is far away from the carrier plate.

As an improvement, the gear structure comprises a transmission gear and a driving gear coaxially arranged with the transmission gear, wherein the diameter of the addendum circle of the transmission gear is larger than that of the driving gear.

As an improvement, the shell comprises a front shell and a rear shell which are buckled together, a first installation space is formed between the front shell and the rear shell, an installation hole communicated with the first installation space is formed in the rear shell, the shell further comprises an outer cover covered on the installation hole, and a second installation space is formed between the outer cover and the rear shell; the transmission gear is inserted between the first installation space and the second installation space, and the driving gear is arranged in the second installation space; the first latch, the second latch, the elastic structure, the pressing block structure and the driving rack are respectively arranged in the second installation space, the long through holes are correspondingly arranged on the peripheral side wall of the outer cover, and the first latch and the second latch are respectively clamped with the part of the transmission gear, which is positioned in the second installation space.

The utility model also discloses a head-mounted device, which comprises a host, a left binding belt and a right binding belt which are respectively and fixedly connected to two opposite sides of the host, wherein a left rack is arranged at one end of the left binding belt, which is far away from the host, a right rack is arranged at one end of the right binding belt, which is far away from the host, and the head-mounted device further comprises a binding belt adjusting mechanism, and the left rack and the right rack are respectively inserted into the cavity to be meshed and transmitted with the upper side and the lower side of the gear structure.

Due to the adoption of the technical scheme, the binding band adjusting mechanism comprises a shell, a gear structure rotationally arranged in a cavity surrounded by the shell, a first latch and a second latch which are respectively and slidably arranged at two opposite sides of the gear structure, an elastic structure used for enabling the first latch and the second latch to be meshed with corresponding sides of the gear structure, a pressing block structure which is slidably arranged in the cavity along the radial direction of the gear structure and used for pushing the first latch and the second latch to be separated from the gear structure, a sliding surface which is perpendicular to the radial direction of the gear structure and is arranged at one side of the pressing block structure far away from the gear structure, a long through hole is arranged at the position corresponding to the sliding surface on the shell, a key which is arranged between the sliding surface and the long through hole and can extend to the outer side of the shell, and a driving rack which is fixedly connected with the key are arranged, wherein the driving rack is meshed with the gear structure after the key is pressed; the head-mounted device comprises a host machine, a left binding belt and a right binding belt which are respectively and fixedly connected to the two opposite sides of the host machine, a left rack is arranged at one end, far away from the host machine, of the left binding belt, a right rack is arranged at one end, far away from the host machine, of the right binding belt, and the head-mounted device further comprises a binding belt adjusting mechanism, wherein the left rack and the right rack are respectively inserted into a cavity to be in meshed transmission with the upper side and the lower side of a gear structure. When the belt adjusting mechanism is adjusted, the press key is pressed, the press block structure can be pushed to slide to one side close to the gear structure, the press block structure can push the first clamping tooth and the second clamping tooth to slide to the direction far away from the gear structure and separate from the gear structure, meanwhile, the driving rack moves synchronously along with the press key and is meshed with the gear structure, the press key is pushed to slide along the sliding surface under the action of external force, the driving rack can drive the gear structure to rotate along with the synchronous sliding of the press key, the left rack and the right rack can be driven to slide in opposite directions or slide far away from the direction through the meshing of the gear structure and the left rack and the right rack so as to realize length adjustment, after adjustment is finished, the press key is released, the elastic structure can drive the first clamping tooth and the second clamping tooth to slide to the direction close to the gear structure and be meshed with the corresponding side of the gear structure, locking can be realized, rotation of the gear structure can be avoided, the opposite sides of the gear structure can be simultaneously locked, and the reliability of the belt adjusting mechanism can be improved; the strap adjusting mechanism is simple in structure and very convenient to adjust, and solves the problems that the structure of the strap adjusting mechanism of the existing head-mounted equipment is complex and the adjustment is inconvenient.

Drawings

FIG. 1 is a schematic perspective view of a strap adjustment mechanism of the present utility model;

FIG. 2 is a schematic front view of the strap adjustment mechanism of the present utility model;

FIG. 3 is a schematic top view of the strap adjustment mechanism of the present utility model;

FIG. 4 is a schematic cross-sectional view taken along line A-A of FIG. 2;

FIG. 5 is a schematic view (enlarged state) of a sectional structure taken along the line B-B in FIG. 3;

FIG. 6 is an exploded view of the strap adjustment mechanism of the present utility model;

FIG. 7 is a schematic perspective view of the strap adjustment mechanism of the present utility model with the outer cover removed;

FIG. 8 is a schematic perspective view of a push block of the strap adjustment mechanism of the present utility model;

wherein, 11, front shell; 12. a rear case; 13. an outer cover; 131. a limiting plate; 14. an elongated through hole; 15. a mounting hole; 16. a briquetting mounting column; 17. a latch mounting post; 20. a gear structure; 21. a transmission gear; 22. a drive gear; 31. a left strap; 32. a left rack; 41. a right strap; 42. a right rack; 51. a first latch; 52. a second latch; 53. an elastic expansion piece; 54. a latch chute; 55. a first latch bevel; 56. a second latch inclined surface; 60. a briquetting structure; 61. a sliding surface; 62. a pushing part; 63. a first pushing inclined surface; 64. a second pushing inclined plane; 65. pressing a block chute; 66. a first retaining wall; 67. a second retaining wall; 70. a key; 71. a carrier plate; 72. a mounting plate; 80. and driving the rack.

Detailed Description

The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

Fig. 1 to 8 are schematic structural views of a band adjusting mechanism of the present utility model, in which fig. 1 shows a schematic perspective view of the band adjusting mechanism of the present utility model, fig. 2 shows a schematic front view of the band adjusting mechanism of the present utility model, fig. 3 shows a schematic plan view of the band adjusting mechanism of the present utility model, fig. 4 shows a schematic sectional view along the line A-A in fig. 2, fig. 5 shows a schematic sectional view (enlarged state) along the line B-B in fig. 3, fig. 6 shows a schematic exploded structural view of the band adjusting mechanism of the present utility model, fig. 7 shows a schematic perspective view of a push block of the band adjusting mechanism of the present utility model after removing a cover, and fig. 8 shows a schematic perspective view of the push block of the band adjusting mechanism of the present utility model. For convenience of description, only the parts related to the present utility model are shown in the drawings.

It should be noted that, if directional indications are referred to in the present utility model, such as up, down, front, back, left, right, etc., the directional indications are merely used to explain the relative positional relationship between the components in a certain specific posture, and if the specific posture is changed, the directional indications are correspondingly changed; if the description of "first", "second", etc. is referred to in this disclosure, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated.

The head-mounted device of the present utility model includes a main body (not shown in the drawings), left and right straps 31 and 41 fixedly connected at opposite sides of the main body, respectively, and a strap adjustment mechanism connected between the left and right straps 31 and 41. As can be seen from fig. 1 to 8, the strap adjusting mechanism comprises a housing, a gear structure 20 rotatably mounted in a cavity enclosed by the housing, a first latch 51 and a second latch 52 slidably mounted on opposite sides of the gear structure 20, an elastic structure for engaging the first latch 51 and the second latch 52 with corresponding sides of the gear structure 20, a pressing block structure 60 slidably mounted in the cavity along a radial direction of the gear structure 20 for pushing the first latch 51 and the second latch 52 to separate from the gear structure 20, a sliding surface 61 perpendicular to the radial direction of the gear structure 20 arranged on one side of the pressing block structure 60 away from the gear structure 20, an elongated through hole 14 arranged on the housing corresponding to the sliding surface 61, a key 70 arranged between the sliding surface 61 and the elongated through hole 14 and capable of extending to the outer side of the housing through the elongated through hole 14, and a driving rack 80 fixedly connected with the key 70, wherein the driving rack 80 is engaged with the gear structure 20 after the key 70 is pressed; the left rack 32 is arranged at one end of the left binding belt 31 far away from the host machine, the right rack 42 is arranged at one end of the right binding belt 41 far away from the host machine, and the left rack 32 and the right rack 42 are respectively inserted into the cavity to be meshed with the upper side and the lower side of the gear structure 20 for transmission.

After wearing the headgear, the host computer is positioned in front of the user, and the left strap 31, the strap adjustment mechanism, and the right strap 41 are looped over the head of the user. During adjustment, the press key 70 is pressed, the press block structure 60 can be pushed to slide towards one side close to the gear structure 20, the press block structure 60 can push the first clamping tooth 51 and the second clamping tooth 52 to slide towards the direction far away from the gear structure 20 and separate from the gear structure 20, meanwhile, the driving rack 80 moves synchronously along with the press key 70 and is meshed with the gear structure 20, the press key 70 is pushed to slide along the sliding surface 61 under the action of external force, the driving rack 80 can drive the gear structure 20 to rotate along with synchronous sliding of the press key 70, the left clamping tooth 32 and the right clamping tooth 42 can be driven to slide oppositely or slide in the direction far away from the right clamping tooth 42 through the meshing of the gear structure 20 and the left clamping tooth 32, the right clamping tooth 42, so that length adjustment is achieved, the adjustment is simple in structure and very convenient, after adjustment is finished, the press key 70 is released, the elastic structure can drive the first clamping tooth 51 and the second clamping tooth 52 to slide towards the direction close to the gear structure 20 and mesh with the corresponding side of the gear structure 20, locking can be achieved, rotation of the gear structure 20 can be avoided, the opposite sides of the gear structure 20 can be locked simultaneously through the first clamping tooth 51 and the second clamping tooth 52, and reliability of the adjustment mechanism can be improved; the strap adjusting mechanism is simple in structure and very convenient to adjust, and solves the problems that the structure of the strap adjusting mechanism of the existing head-mounted equipment is complex and the adjustment is inconvenient.

In the present utility model, for convenience of adjustment, the gear structure 20 includes a transmission gear 21, a driving gear 22 coaxially disposed with the transmission gear 21, the diameter of the addendum circle of the transmission gear 21 being larger than the diameter of the addendum circle of the driving gear 22; the left rack 32 and the right rack 42 are respectively meshed with the upper side and the lower side of the transmission gear 21 for transmission, and the driving rack 80 is arranged corresponding to the driving gear 22, so that quick adjustment can be realized.

In particular, the transmission gear 21 and the driving gear 22 are connected into an integral structure, which can facilitate installation, and are generally formed integrally by machining or injection molding.

In the utility model, the sliding direction of the first latch 51 and the second latch 52 is parallel to the sliding surface 61, and latch sliding connection structures are respectively arranged between the first latch 51, the second latch 52 and the inner side wall of the shell; the sliding direction of the pressing block structure 60 is perpendicular to the sliding direction of the first latch 51 and the second latch 52, and a pressing block sliding connection structure is arranged between the pressing block structure 60 and the inner side wall of the housing.

Specifically, the first latch 51 and the second latch 52 respectively include a body portion and a tooth portion disposed at a side of the body portion near the gear structure 20; the latch sliding connection structure includes a latch chute 54 provided on the body portion in a sliding direction of the first latch 51, the second latch 52, and a latch plug fixed on an inner side wall of the housing and inserted into the latch chute 54, the latch chute 54 being closed at both ends. Normally, the latch chute 54 is in a through hole shape, however, the latch chute 54 may be provided in a groove shape; the latch connector includes two latch mounting posts 17 disposed at intervals along the sliding direction of the first latch 51 and the second latch 52, and may be a plug board. The latch sliding connection structure is used for limiting the sliding travel of the first latch 51 and the second latch 52, so that the overlarge pressure between the first latch 51, the second latch 52 and the gear structure 20 can be avoided, and the service life can be prolonged.

The press block sliding connection structure comprises a press block chute 65 arranged on the press block structure 60 along the sliding direction of the press block structure 60, and press block connectors fixed on the inner side wall of the shell and inserted into the press block chute 65, wherein two ends of the press block chute 65 are closed. Normally, the pressing block chute 65 is in a through hole shape, however, the pressing block chute 65 may be provided in a groove shape; the briquetting plug comprises two briquetting mounting posts 16 spaced along the sliding direction of the briquetting structure 60, although it could be provided as a plug board. The briquetting limit structure is used for limiting the sliding travel of the briquetting structure 60, so that the briquetting structure 60 can be prevented from being pressed onto the gear structure 20 when the key 70 is pressed, and damage to the gear structure 20 is avoided.

In the present utility model, for convenience of installation, the elastic structure is an elastic expansion member 53 connected between the first latch 51 and the second latch 52, and specifically, the elastic expansion member 53 is a spring, and may be an elastic pull cord.

In other embodiments, the elastic structure may be provided in a form that elastic telescopic members 53 are respectively provided corresponding to the first latch 51 and the second latch 52.

In the present utility model, the pressing block structure 60 is provided with a pushing portion 62 located between the first latch 51 and the second latch 52, and two sides of the pushing portion 62 corresponding to the first latch 51 and the second latch 52 are respectively provided with a first pushing inclined plane 63 and a second pushing inclined plane 64, so as to facilitate pushing the first latch 51 and the second latch 52 to slide in a direction away from the gear structure 20 and separate from the gear structure 20.

Specifically, a first retaining wall 66 and a second retaining wall 67 are respectively disposed at one side of the first pushing inclined plane 63 and the second pushing inclined plane 64 away from the inner side wall of the housing, so that the first latch 51 is clamped between the first retaining wall 66 and the inner side wall of the housing on the corresponding side, and the second latch 52 is clamped between the second retaining wall 67 and the inner side wall of the housing on the corresponding side, so as to prevent the first latch 51 and the second latch 52 from falling off.

Typically, a first latch bevel 55 is provided on a side of the first latch 51 corresponding to the first push bevel 63 and a second latch bevel 56 is provided on a side of the second latch 52 corresponding to the second push bevel 64.

In the present utility model, in order to facilitate the installation of the key 70 and the sliding along the sliding surface 61, a carrier 71 is disposed between the sliding surface 61 and the elongated through hole 14, and the key 70 is fixedly connected to the carrier 71; a mounting plate 72 is fixed to a side of the carrier plate 71 close to the gear structure 20, and a driving rack 80 is provided on a side of the mounting plate 72 away from the carrier plate 71.

Specifically, in order to facilitate sliding of the carrier 71, a slide way disposed along an extending direction of the elongated through hole 14 is disposed on an inner side wall of the housing corresponding to one side edge of the elongated through hole 14 in a cavity enclosed by the housing, the side edge of the carrier 71 is inserted into the slide way, and a space is disposed between the carrier 71 and a side wall of the slide way, which is close to the gear structure 20, of the slide way. After the key 70 is pressed, the carrier plate 71 contacts with the side wall of the slideway, which is close to the gear structure 20, so that a support can be formed, and the key 70 is pushed to slide more stably.

In the utility model, the shell comprises a front shell 11 and a rear shell 12 which are buckled together, a first installation space is formed between the front shell 11 and the rear shell 12, an installation hole 15 communicated with the first installation space is arranged on the rear shell 12, the shell also comprises a housing 13 covered on the installation hole 15, and a second installation space is formed between the housing 13 and the rear shell 12; the gear structure is rotatably installed between the front shell 11 corresponding to the position of the mounting hole 15 and the top of the outer cover 13, and the first latch 51, the second latch 52, the elastic structure, the pressing block structure 60 and the driving rack 80 are respectively arranged in the second mounting space, and the elongated through hole 14 is correspondingly arranged on the peripheral side wall of the outer cover 13.

Specifically, the transmission gear 21 of the gear structure 20 is inserted between the first installation space and the second installation space, and the driving gear 22 of the gear structure 20 is disposed in the second installation space; the left rack 32 and the right rack 42 are respectively inserted into the first installation space and meshed with the part of the transmission gear 21 located in the first installation space for transmission, and the first latch 51 and the second latch 52 are respectively engaged with the part of the transmission gear 21 located in the second installation space.

In general, a stopper plate 131 is provided on the inner side wall of the ceiling of the housing 13, and a slide is formed between the stopper plate 131 and the peripheral side wall of the housing 13 provided with the elongated through hole 14. Of course, grooves may be provided directly on the inner side wall of the top of the housing 13 to form a slideway.

In other embodiments, the housing may just comprise a front housing 11 and a rear housing 12 that are fastened together, and the cavity is defined between the front housing 11 and the rear housing 12.

The foregoing description of the embodiments of the utility model is not intended to limit the utility model to the particular embodiments disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model.

Claims (11)

1. The binding band adjusting mechanism comprises a shell and is characterized by further comprising a gear structure which is rotatably arranged in a cavity enclosed by the shell, a first latch and a second latch which are respectively and slidably arranged at two opposite sides of the gear structure, an elastic structure which is used for enabling the first latch and the second latch to be meshed with the corresponding sides of the gear structure, a pressing block structure which is slidably arranged in the cavity along the radial direction of the gear structure and is used for pushing the first latch and the second latch to be separated from the gear structure, a sliding surface which is perpendicular to the radial direction of the gear structure and is arranged at one side of the pressing block structure far away from the gear structure, and a long through hole which is arranged at the position corresponding to the sliding surface on the shell; the sliding surface is arranged between the sliding surface and the long through hole, the sliding surface can penetrate through the long through hole to extend to the outer side of the shell, the sliding surface is fixedly connected with the key, and the driving rack is meshed with the gear structure after the key is pressed.

2. The strap adjustment mechanism of claim 1 wherein the sliding direction of the first latch and the second latch is parallel to the sliding surface, and wherein latch sliding connection structures are provided between the first latch, the second latch, and the housing inner side wall, respectively; the sliding direction of the pressing block structure is perpendicular to the sliding direction of the first clamping tooth and the second clamping tooth, and a pressing block sliding connection structure is arranged between the pressing block structure and the inner side wall of the shell.

3. The strap adjustment mechanism of claim 2, wherein the first and second latches each include a body portion, a tooth portion disposed on a side of the body portion adjacent the gear structure; the latch sliding connection structure comprises a latch chute arranged on the body part along the sliding direction of the first latch and the second latch, and a latch plug connector which is fixed on the inner side wall of the shell and inserted into the latch chute, and two ends of the latch chute are closed.

4. The strap adjustment mechanism of claim 2 wherein the press block sliding connection structure comprises a press block chute provided on the press block structure along a sliding direction of the press block structure, a press block plug connector fixed on an inner side wall of the housing and inserted into the press block chute, and both ends of the press block chute are closed.

5. The binding band adjusting mechanism according to claim 2, wherein a pushing portion between the first latch and the second latch is provided on the pressing block structure, and a first pushing inclined plane and a second pushing inclined plane are provided on the pushing portion at two sides corresponding to the first latch and the second latch, respectively.

6. The strap adjustment mechanism of claim 5, wherein first and second retaining walls are formed on the pushing portion at sides corresponding to the first and second pushing inclined surfaces, respectively, the first latch being clamped between the first retaining wall and the housing inner side wall at the corresponding side, and the second latch being clamped between the second retaining wall and the housing inner side wall at the corresponding side.

7. The strap adjustment mechanism of claim 1 wherein the resilient structure is a resilient telescoping member connected between the first latch and the second latch.

8. The strap adjustment mechanism of claim 1 wherein a carrier plate is disposed between the sliding surface and the elongated through hole, the key being fixedly connected to the carrier plate; one side of the carrier plate, which is close to the gear structure, is fixed with a mounting plate, and the driving rack is arranged on the side edge of the mounting plate, which is far away from the carrier plate.

9. The strap adjustment mechanism according to any one of claims 1 to 8 wherein the gear arrangement includes a drive gear, a drive gear coaxially disposed with the drive gear, the diameter of the tip circle of the drive gear being greater than the diameter of the tip circle of the drive gear.

10. The strap adjustment mechanism of claim 9 wherein the housing includes a front shell and a rear shell that snap together forming a first mounting space therebetween, a mounting hole provided in the rear shell that communicates with the first mounting space, and a cover that covers the mounting hole forming a second mounting space between the cover and the rear shell; the transmission gear is inserted between the first installation space and the second installation space, and the driving gear is arranged in the second installation space; the first latch, the second latch, the elastic structure, the pressing block structure and the driving rack are respectively arranged in the second installation space, the long through holes are correspondingly arranged on the peripheral side wall of the outer cover, and the first latch and the second latch are respectively clamped with the part of the transmission gear, which is positioned in the second installation space.

11. The utility model provides a head-mounted device, includes host computer, respectively fixed connection be in left bandage and the right bandage of the relative both sides department of host computer left bandage is kept away from and is equipped with left rack on the one end of host computer right bandage is kept away from be equipped with right rack on the one end of host computer, its characterized in that still includes the bandage adjustment mechanism of any one of claims 1 through 10, left rack right rack insert respectively in the cavity with gear structure's upper and lower both sides meshing transmission.