CN210807590U

CN210807590U - Bone conduction earphone

Info

Publication number: CN210807590U
Application number: CN201921310954.7U
Authority: CN
Inventors: 何浙东
Original assignee: Shenzhen Ainuoshi Technology Co ltd
Current assignee: Shenzhen Ainuoshi Technology Co ltd
Priority date: 2019-08-12
Filing date: 2019-08-12
Publication date: 2020-06-19
Anticipated expiration: 2029-08-12

Abstract

The utility model provides a bone conduction earphone, which comprises an ear hook and a rear hook, and also comprises a connecting casing shell for assembling a control circuit board, wherein the connecting casing shell is provided with an assembling hole site and two assembling holes which are arranged in a back direction, and the assembling hole site extends to the assembling holes along an axial direction which is perpendicular to the assembling holes; the end part of the ear hanger is provided with a first connector, the first connector is provided with a first mounting hole, the end part of the rear hanger is provided with a second connector, and the second connector is provided with a second mounting hole; the first connector is inserted into one of the assembly holes, the second connector is inserted into the other assembly hole, and the first connector and the second connector are respectively locked and fixed in the corresponding assembly holes through screws penetrating through the assembly hole positions. The utility model discloses an use the screw to fix first connector and second connector locking, simple structure is reasonable, and maneuverability is strong, can improve work efficiency.

Description

Bone conduction earphone

Technical Field

The embodiment of the utility model provides a relate to earphone equipment field, more specifically say, relate to a bone conduction earphone.

Background

Bone conduction is a sound conduction mode, namely, sound is converted into mechanical vibration with different frequencies, and sound waves are transmitted through the skull, the bone labyrinth, the lymph fluid transmission of the inner ear, the spiral organ, the auditory nerve and the auditory center of a human body. The bone conduction earphone receives the sound by using a bone conduction technology and is tightly attached to the bone, and the sound wave can be directly transmitted to the auditory nerve through the bone, so that the ears can be opened, the eardrum is not damaged, and the bone conduction earphone is widely loved by consumers.

However, the connection mode of the ear hook and the rear hook of the bone conduction headset on the market is relatively independent, so that the processing is complicated, and the production and the manufacture are not facilitated. In addition, the connecting structure of the existing bone conduction earphone has poor detachability, is inconvenient for maintenance and operation, and has seriously limited practicability.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides a connection mode to the ear-hang of above-mentioned current bone conduction earphone and back-hang is relatively more independent to cause processing to complicate, it is poor to be unfavorable for the detachability of manufacturing and connection structure, and the maintenance operation of being not convenient for has restricted the problem of the practicality of using, provides a new bone conduction earphone.

The embodiment of the present invention provides a bone conduction earphone, which comprises an ear hook and a rear hook, and further comprises a connecting casing for assembling a control circuit board, wherein the connecting casing is provided with an assembling hole site and two assembling holes arranged in a back direction, and the assembling hole site extends to the assembling holes along an axial direction perpendicular to the assembling holes; the end part of the ear hanger is provided with a first connector, the first connector is provided with a first mounting hole, the end part of the rear hanger is provided with a second connector, and the second connector is provided with a second mounting hole; the first connector is inserted into one of the assembly holes, the second connector is inserted into the other assembly hole, and the first connector and the second connector are respectively locked and fixed in the corresponding assembly holes through screws penetrating through the assembly hole positions.

Preferably, the end surface of the free end of the first connecting head is provided with a first mounting plate protruding along the axial direction, and the first mounting hole is positioned on the first mounting plate; the terminal surface of the free end of second connector has along the second mounting panel of axial projection, the second mounting hole is located on the second mounting panel, just first mounting hole and second mounting hole are through hole.

Preferably, the two assembling holes are respectively formed by openings at two ends of a through hole penetrating through the connecting casing, and the first mounting plate of the first connector and the second mounting plate of the second connector are overlapped in the through hole; and the first connector and the second connector are locked and fixed with the connecting sleeve shell through screws penetrating through the assembling hole position, the first mounting hole and the second mounting hole.

Preferably, the connection sleeve comprises a shell main body and a shell cover assembled to the top of the shell main body, the assembling holes and the assembling hole sites are both positioned on the shell cover, and the assembling hole sites extend to the bottom surface of the shell cover; and the screws penetrate into the assembling hole positions from the bottom surface of the shell cover to lock and fix the first connector and the second connector with the shell cover.

Preferably, the housing main body has a mounting cavity for mounting a control circuit board therein, the first connector includes a first cable led out from the ear hook, the second connector includes a second cable led out from the rear hook, and when the first connector and the second connector are mounted in the mounting hole, the first cable and the second cable are respectively inserted into and extended into the mounting cavity of the housing main body through the mounting hole;

the inner wall of the through hole is provided with a convex block, and the convex block is provided with a fixing hole coaxial with the assembling hole; the screws are screwed to the fixing holes by passing through the assembling hole sites, and lockingly fix the first and second coupling heads to the case cover.

Preferably, the ear hook further comprises a first metal wire and a first elastic protection layer wrapped on the outer layer of the first metal wire and the outer layer of the first cable, and the end part of the first metal wire is bent in the first connector;

the rear hanger further comprises a second metal wire and a second elastic protection layer wrapping the second metal wire and the outer layer of the second cable, and the end portion of the second metal wire is bent in the second connector.

Preferably, the first connector has a first groove corresponding to an end of the first elastic protection layer, and a first wire passing through hole penetrating through the first connector, and an inlet of the first wire passing through hole is located at a bottom surface of the first groove, and an outlet of the first wire passing through hole faces an axial direction perpendicular to the inlet of the first wire passing through hole; when the end part of the first elastic protection layer is embedded and fixed to the first groove, the first cable passes through the first wire passing through hole and extends to the outside of the ear hook;

the second connector is provided with a second groove corresponding to the end part of the second elastic protection layer and a second wire passing through hole penetrating through the second connector, and the inlet of the second wire passing through hole is positioned on the bottom surface of the second groove, and the direction of the outlet of the second wire passing through hole is vertical to the axial direction of the inlet of the second wire passing through hole; and when the end part of the second elastic protection layer is embedded and fixed to the second groove, the second cable passes through the second wire passing through hole and extends to the outside of the rear hanger.

Preferably, the bottom of the housing cover is provided with one or more elastic hooks, the top of the housing main body is provided with one or more buckles, and the housing cover is fixedly mounted on the housing main body by combining the elastic hooks and the buckles.

Preferably, the bottom of the housing cover is further provided with a plurality of positioning columns, the top of the housing main body is provided with a plurality of positioning holes corresponding to the plurality of positioning columns, and when the housing cover is assembled to the housing main body, each positioning column is embedded into one positioning hole.

Preferably, the two assembling holes are independent from each other, the assembling hole site comprises a first assembling hole and a second assembling hole which are independent from each other, the first assembling hole extends to one of the assembling holes, and the second assembling hole extends to the other assembling hole; the first connecting head is locked and fixed with the connecting sleeve shell through a screw passing through the first assembling hole and the first installing hole; and the second connector is locked and fixed with the connecting sleeve shell through screws penetrating through the second assembling hole and the second mounting hole.

The utility model discloses bone conduction earphone has following beneficial effect: through the first mounting hole that sets up first connector and the second mounting hole of second connector, can directly fix first connector and second connector locking through the screw, simple structure is reasonable, and the connected mode through the fix with screw is firm reliable, and maneuverability is strong, is convenient for maintain the operation to the equipment is convenient, can effectively improve work efficiency.

Drawings

Fig. 1 is a schematic structural diagram of a partial section of a bone conduction earphone according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an end portion of an ear hook of a bone conduction earphone according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of an end portion of a rear suspension of a bone conduction earphone according to an embodiment of the present invention;

fig. 4 is a schematic overall structure diagram of a bone conduction earphone according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1, it is a schematic structural diagram of the bone conduction earphone provided by the embodiment of the present invention, and the bone conduction earphone can be applied to the field of earphone devices, especially in the bone conduction earphone that realizes reliable connection between the ear hook 1 and the rear hook 2. The bone conduction headset in the present embodiment includes an ear hook 1 and a rear hook 2 for wearing, and the ear hook 1 has a speaker portion for emitting sound. Specifically, the bone conduction headset further comprises a connection sleeve 3, and the connection sleeve 3 can be used for mounting a control circuit board and related functional components (such as an energy storage battery), so that the structural layout design is facilitated; moreover, the connecting casing 3 is provided with an assembling hole site 301 (which may be a channel structure for avoiding assembling operations) and two assembling holes arranged in a back direction, and the assembling hole site 301 extends to the assembling holes along an axial direction perpendicular to the assembling holes, so that the assembling operations in the assembling holes are conveniently performed through the assembling hole site 301.

Referring to fig. 2 and 3, the end of the ear-hook 1 has a first connector 11, and the first connector 11 has a first mounting hole 111; similarly, the end of the rear hanger 2 has a second connector 21, and the second connector 21 has a second mounting hole 211; in practical applications, the first mounting hole 111 and the second mounting hole 211 may be threaded holes or through holes, and may be determined according to practical requirements.

During assembly, the first connector 11 is inserted into one assembly hole, the second connector 21 is inserted into the other assembly hole, and then the first connector 11 and the second connector 21 are respectively locked and fixed in the corresponding assembly holes by using the screws 4 to pass through the assembly hole sites 301 and enter the assembly holes.

In particular, when the first mounting hole 111 is a threaded hole and the second mounting hole 211 is a through hole, the screw 4 may be threaded and fixed to the first mounting hole 111 after sequentially passing through the assembling hole 301 and the second mounting hole 211 (specifically, the first connector 11 and the second connector 21 may be respectively limited by matching with the corresponding assembling holes), so as to directly lock and fix the first connector 11 and the second connector 21. Correspondingly, when the first mounting hole 111 is a through hole and the second mounting hole 211 is a threaded hole, the screw 4 may be threaded and fixed to the second mounting hole 211 after sequentially passing through the assembling hole 301 and the first mounting hole 111 (specifically, the first connector 11 and the second connector 21 may be respectively limited by matching with the corresponding assembling holes), so as to directly lock and fix the first connector 11 and the second connector 21.

Alternatively, when the first mounting hole 111 and the second mounting hole 211 are through holes, threaded holes corresponding to the first mounting hole 111 and the second mounting hole 211 may be provided in the mounting holes, and then the screws 4 may be screwed into the threaded holes after passing through the first mounting hole 111 and/or the second mounting hole 211, so as to lock and fix the first connector 11 and/or the second connector 21 (i.e., fixed integrally with each other or fixed separately) to the connection housing 3.

Above-mentioned bone conduction earphone can realize directly locking first connector 11 and second connector 21 fixedly through screw 4 through setting up in first mounting hole 111 of first connector 11 and the second mounting hole 211 of second connector 21, and this connection structure is simple reasonable, and firm reliable through the fixed connected mode of screw 4, and maneuverability is strong, is convenient for maintain the operation to the equipment is convenient, can effectively improve work efficiency.

Specifically, the first mounting hole 111 and the second mounting hole 211 of the present embodiment are through holes, which is beneficial to improving the structural connection strength, and the first mounting hole 111 and/or the second mounting hole 211 are locked and fixed with the connection sleeve 3, so that the play between the first connector 11 and the second connector 21 can be avoided, and the connection stability can be improved.

Further, the end surface of the free end of the first connector 11 has a first mounting plate 112 projecting in the axial direction, and the first mounting hole 111 is located on the first mounting plate 112. It is also provided that the end face of the free end of the second connection head 21 has a second mounting plate 212 projecting in the axial direction, and that the second mounting hole 211 is located on the second mounting plate 112. The bone conduction headset of the embodiment can make the structure simple and practical by arranging the first mounting plate 112 at the first connector 11 and the second connecting plate 212 at the second connector 21, facilitates the structural design and the assembly, can effectively utilize the flat structure to carry out the matching connection of parts, reduces the connection gap between the parts, and makes the structural connection more compact and firm.

In one embodiment of the invention, the two assembly holes are each formed by a two-end opening through the through-hole of the connecting shell 3, and the first mounting plate 112 of the first connecting head 11 and the second mounting plate 212 of the second connecting head 21 overlap in the through-hole. During assembly, the first connector 11 and the second connector 21 can be locked and fixed to the connection housing 3 by screws 4 passing through the assembly holes 301, the first mounting holes 111 and the second mounting holes 211. That is, the first mounting plate 112 and the second mounting plate 212 are locked and fixed to the connecting casing 3 by the same screw 4 in an overlapping manner, which is beneficial to improving the convenience of operation, is convenient for assembly and can effectively improve the working efficiency. In practical applications, the relative positions of the first connecting plate 112 of the first connecting head 11 and the second connecting plate 212 of the second connecting head 21 when they are overlapped (the front and rear positions of the nut relative to the screw 4) can be adjusted according to practical situations.

As shown in fig. 4, the connection housing 3 includes a housing main body 32 and a housing cover 31 fitted to the top of the housing main body 32, and the fitting holes and the assembling hole sites 301 are provided in the housing cover 31; specifically, the assembling hole 301 extends to the bottom surface of the case cover 31, and the screws 4 pass through the assembling hole 301 from the bottom surface of the case cover 31 to fasten and lock the first and

second connection terminals

11 and 21 to the case cover 31, thereby facilitating assembly and maintenance operations by modularizing the connection housings 3.

Specifically, the housing main body 32 has a mounting cavity 321 for mounting the control circuit board, i.e., related functional components, therein, and during maintenance, the housing main body 32 can be detached alone for maintenance operation, so that the working efficiency is high. In addition, the first connector 11 includes the first cable 12 that is drawn by the ear-hook 1, the second connector 21 includes the second cable 22 that is drawn by the back-hook 2, and when the first connector 11 and the second connector 21 are assembled in the mounting hole, the first cable 12 and the second cable 22 are inserted respectively through the assembly hole site 301 and are extended to the mounting cavity 321 of the shell main body 32, thereby realize and assemble the control circuit board conductive connection in the mounting cavity 321, guarantee that the functional use mode of bone conduction earphone can be stably realized.

Preferably, the inner wall of the through hole in the cover 31 has a projection 311, and the projection 311 is provided with a fixing hole 312 coaxial with the assembling hole site 301, by being arranged coaxially, the mounting operation of the screw 4 can be facilitated. Specifically, the screws 4 are screwed into the fixing holes 312 through the assembling hole sites 301, whereby the first and

second connection heads

11 and 21 can be lockingly fixed to the case cover 31, improving the realizability of the structural design.

In practical application, when the first connector 11 and the second connector 21 are assembled in the assembly holes, the end surface of the free end of the first connector 11 can be attached to the surface of the side wall of the connection bump 311, and the end surface of the free end of the second connector 21 can be attached to the surface of the other side wall of the connection bump 311, so that the structure can be more closed and compact, and the connection strength and the stability of the structure can be improved. Of course, in order to further improve the structural stability, the end surface of the first connecting plate 112 of the first connector 11 facing away from the first connector 11 may be attached to the end surface of the free end of the second connector 21, and the end surface of the second connecting plate 212 of the second connector 21 facing away from the second connector 21 may be attached to the end surface of the free end of the first connector 11.

In order to improve the strength of the ear hook 1 and make the ear hook 1 have elasticity, the ear hook 1 comprises a first metal wire 13 and a first elastic protection layer 14 wrapped on the outer layer of the first metal wire 13 and the first cable 12, so that the first metal wire 13 and the first cable 12 can be protected by the first elastic protection layer 14, and the service life of the first metal wire 13 and the first cable 12 is prolonged. Moreover, the end of the first wire 13 is bent in the first connector 11, so that the stable connection between the first wire 13 and the first connector 11 can be ensured, the first connector 11 is prevented from being separated from the end of the ear-hook 1, and the connection reliability and the connection strength of the first connector 11 are improved.

In the same design, in order to improve the strength of the rear hanger 2 and enable the rear hanger 2 to have elasticity, the rear hanger 2 comprises a second metal wire 23 and a second elastic protection layer 24 wrapped on the outer layer of the second metal wire 23 and the outer layer of the second cable 22, the second metal wire 23 and the second cable 22 can be protected by the second elastic protection layer 24, and the service life of the second metal wire 23 and the service life of the second cable 22 are prolonged. Moreover, the end of the second wire 23 is bent in the second connector 21, so that the stable connection between the second wire 23 and the second connector 21 can be ensured, the end of the second connector 21 is prevented from being hung after being separated, and the connection reliability and the connection strength of the second connector 21 are improved.

The first connector 11 has a first groove corresponding to the end of the first elastic protection layer 14, so that the end of the first elastic protection layer 14 can be embedded and fixed in the first groove, thereby protecting the end of the first elastic protection layer 14, avoiding deformation or aging damage due to long-term touch, and prolonging the service life of the first elastic protection layer 14.

In particular, the first connection head 11 further has a first wire passing through hole penetrating through the first connection head 11, an inlet of the first wire passing through hole is located on a bottom surface of the first groove, and an outlet of the first wire passing through hole faces an axial direction perpendicular to the inlet (i.e., the first wire passing through hole includes two sections of mutually perpendicular wire passing channels); namely, when the end of the first elastic protection layer 14 is embedded and fixed to the first groove, the first cable 12 extends to the outside of the ear-hook 1 through the first wire passing through hole. Therefore, the routing convenience of the first cable 12 can be improved, the first cable 12 can be protected, the first cable 12 is directly turned at the first wire passing through hole and directly enters the installation cavity 301 from the assembling hole position 301, and the first cable 12 can be prevented from being scratched and extruded when the screw 4 is assembled.

Similarly, the second connector 21 has a second groove corresponding to the end of the second elastic protection layer 24, and the end of the second elastic protection layer 24 can be embedded and fixed in the second groove, so as to protect the end of the second elastic protection layer 24, prevent deformation or aging damage due to long-term touch, and prolong the service life of the second elastic protection layer 24.

Moreover, the first connector 11 is also provided with a second wire passing through hole penetrating through the second connector 21, an inlet of the second wire passing through hole is located at the bottom surface of the second groove, and the direction of an outlet of the second wire passing through hole is perpendicular to the axial direction of the inlet (and the second wire passing through hole comprises two sections of mutually perpendicular wire passing channels); namely, when the end of the second elastic protection layer 24 is embedded and fixed to the second groove, the second cable 22 passes through the second wire passing through hole and extends to the outside of the rear hanger 2. Therefore, the second cable 22 can be protected while the routing convenience of the second cable 22 is improved, and the second cable 22 can be prevented from being scratched and extruded when the screw 4 is assembled by directly turning the second cable 22 at the first wire passing through hole and directly entering the installation cavity 301 from the assembling hole site 301.

In order to facilitate the connection and fixation of the shell main body 32 and the shell cover 31, the bottom of the shell cover 31 is provided with one or more elastic hooks 313, the top of the shell main body 32 is provided with one or more buckles, the shell cover 31 is combined with the buckles through the elastic hooks 313 and is installed and fixed on the shell main body 32, the installation and the disassembly are convenient, the assembly efficiency can be effectively improved, and when the shell cover 31 is installed and fixed on the shell main body 32, the assembly hole site 301 is positioned in the shell main body 32, namely, the assembly hole site 301 can be covered and hidden, and the appearance can be more attractive.

Of course, in practical applications, the housing main body 32 and the housing cover 31 may be fixed by other connection methods, such as by screwing.

Preferably, the bottom of the housing cover 31 is further provided with a plurality of positioning posts 314, the top of the housing main body 32 is provided with a plurality of positioning holes corresponding to the plurality of positioning posts 314, and when the housing cover 31 is assembled to the housing main body 32, each positioning post 314 is embedded into one positioning hole. Therefore, the circumferential rotation of the shell main body 32 around the shell cover 31 can be avoided, the connection stability can be ensured, the burden of the connection combination structure of the elastic hook 313 and the buckle structure can be reduced, the service life of the elastic hook 313 and the buckle can be prolonged, and the structure is more reasonable and reliable.

In another embodiment of the present invention, the two assembling holes may be disposed independently (i.e. separately or not directly connected), and the assembling hole site 301 includes a first assembling hole and a second assembling hole which are independent from each other; specifically, the first assembly hole extends to one of the assembly holes, and the second assembly hole extends to the other assembly hole; and, the first connector 11 is locked and fixed with the connection housing 3 by the screw 4 passing through the first assembling hole and the first mounting hole 111; the second connector 21 is locked and fixed to the connection housing 3 by screws 4 passing through the second assembling holes and the second mounting holes 211. Namely, the first connector 11 and the second connector 21 are separately and independently locked and fixed with the connecting sleeve 3. Therefore, the connecting structure can meet different application occasions, and the design of the connecting structure is more flexible and practical.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. The bone conduction earphone comprises an ear hook and a rear hook and is characterized by further comprising a connecting casing for assembling a control circuit board, wherein the connecting casing is provided with an assembling hole site and two assembling holes which are arranged in a back direction, and the assembling hole site extends to the assembling holes along an axial direction which is perpendicular to the assembling holes; the end part of the ear hanger is provided with a first connector, the first connector is provided with a first mounting hole, the end part of the rear hanger is provided with a second connector, and the second connector is provided with a second mounting hole; the first connector is inserted into one of the assembly holes, the second connector is inserted into the other assembly hole, and the first connector and the second connector are respectively locked and fixed in the corresponding assembly holes through screws penetrating through the assembly hole positions.

2. The bone conduction headset of claim 1, wherein an end surface of the free end of the first connector has a first mounting plate protruding in an axial direction, and the first mounting hole is located on the first mounting plate; the terminal surface of the free end of second connector has along the second mounting panel of axial projection, the second mounting hole is located on the second mounting panel, just first mounting hole and second mounting hole are through hole.

3. The bone conduction earphone according to claim 2, wherein the two fitting holes are respectively formed by openings at both ends of a through hole penetrating the connection housing, and the first mounting plate of the first connector and the second mounting plate of the second connector are overlapped in the through hole; and the first connector and the second connector are locked and fixed with the connecting sleeve shell through screws penetrating through the assembling hole position, the first mounting hole and the second mounting hole.

4. The bone conduction headset of claim 3, wherein the connection housing includes a housing body and a housing cover mounted to a top of the housing body, the mounting and assembly holes being located in the housing cover, and the assembly holes extending to a bottom surface of the housing cover; and the screws penetrate into the assembling hole positions from the bottom surface of the shell cover to lock and fix the first connector and the second connector with the shell cover.

5. The bone conduction headset of claim 4, wherein the housing body has a mounting cavity therein for mounting a control circuit board, and the first connector comprises a first cable led out from the ear hook, and the second connector comprises a second cable led out from the rear hook, and when the first connector and the second connector are mounted in the mounting hole, the first cable and the second cable are respectively inserted and extended into the mounting cavity of the housing body through the mounting hole;

6. The bone conduction headset of claim 5, wherein the earhook further comprises a first wire and a first elastic protection layer wrapped around the first wire and an outer layer of the first cable, and an end of the first wire is bent inside the first connector;

7. The bone conduction headset of claim 6, wherein the first connector has a first groove corresponding to an end of the first elastic protection layer, and a first wire through hole penetrating through the first connector, and an inlet of the first wire through hole is located at a bottom surface of the first groove, and an outlet of the first wire through hole faces an axial direction perpendicular to the inlet of the first wire through hole; when the end part of the first elastic protection layer is embedded and fixed to the first groove, the first cable passes through the first wire passing through hole and extends to the outside of the ear hook;

8. The bone conduction headset of claim 4, wherein the bottom of the housing cover has one or more resilient hooks, the top of the housing body has one or more snaps, and the housing cover is fixedly mounted to the housing body by the resilient hooks engaging the snaps.

9. The bone conduction earphone according to claim 8, wherein the bottom of the housing cover is further provided with a plurality of positioning posts, the top of the housing main body is provided with a plurality of positioning holes corresponding to the plurality of positioning posts, and each positioning post is embedded in one of the positioning holes when the housing cover is assembled to the housing main body.

10. The bone conduction headset of claim 1 or 2, wherein the two assembly holes are independent of each other, the assembly hole locations include a first assembly hole and a second assembly hole that are independent of each other, and the first assembly hole extends to one of the assembly holes, and the second assembly hole extends to the other assembly hole; the first connecting head is locked and fixed with the connecting sleeve shell through a screw passing through the first assembling hole and the first installing hole; and the second connector is locked and fixed with the connecting sleeve shell through screws penetrating through the second assembling hole and the second mounting hole.