A bluetooth cassette hearing aid

Abstract

The present application relates to the field of hearing aids, in particular to a Bluetooth box-type hearing aid, comprising a fixing structure, a box-type hearing aid and a protective shell, the box-type hearing aid is installed in the protective shell, and the protective shell is fixed on the shoulder of the human body through the fixing structure, the present application fixes the box-type hearing aid on the shoulder of the human body through the fixing structure, avoiding the problem that the traditional box-type hearing aid is placed in the pocket of the chest or the thigh, and the wire is frequently rubbed with clothes to produce "rustling" sound. The fixing structure is an S-shaped structure, the clamping part of which is bent towards the fixing structure, and can be stably clamped on the clothes on the shoulder, since the position of the hearing aid host is fixed on the shoulder, away from the frequently moving area of the clothes, the wire rubbing interference is significantly reduced. At the same time, when the user needs to adjust the volume in a noisy environment, the hearing aid does not need to be taken out frequently, and can be adjusted remotely through external operation or Bluetooth connection, avoiding repeated taking and placing, and improving the convenience of use.

Description

Technical Field

[0001] This invention relates to the field of hearing aids, specifically a Bluetooth box-type hearing aid. Background Technology

[0002] A box-type hearing aid (also known as a body-worn or pocket-type hearing aid) is a traditional hearing aid device. It resembles a small radio and usually consists of a microphone, amplifier, and battery. It is connected to the earpiece or earmold via a wire. The main unit of this type of hearing aid is usually placed in a chest pocket or thigh pocket. The wire is very easy to rub against clothing, thus producing interference noise such as "rustling" sound. Secondly, since the hearing aid unit can only be placed in a pocket, in noisy environments, if the user needs to turn down the sound received by the unit, they need to take it out and adjust it. A single adjustment does not affect its practicality, but if the sound in the environment fluctuates, it is necessary to take it out and adjust it frequently and put it back in the pocket, which is too inconvenient. Summary of the Invention

[0003] The present invention provides a Bluetooth box-type hearing aid that overcomes the shortcomings described in the background art.

[0004] The technical solution adopted by this invention to solve its technical problem is: A Bluetooth box-type hearing aid includes a fixing structure, a box-type hearing aid, and a protective shell. The box-type hearing aid is installed inside the protective shell, and the protective shell is fixed to the human shoulder by the fixing structure. The fixing structure is an S-shaped structure, which includes an airbag and a clamping part. The airbag is located at the end of the fixing structure near the protective shell, and the clamping part is located at the end of the fixing structure away from the protective shell. The clamping part is bent toward the fixing structure. The protective shell has an opening on one of its left or right sides. A sound transmission window is provided on the surface of the protective shell near the receiver of the box-type hearing aid. The port of the sound transmission window is covered with a sponge sheet. A closing window is provided on the protective shell near the sound transmission window. The closing window is fixed to the side of the protective shell by a hinge. There is a gap between the upper and lower ends of the closing window and the edge of the protective shell. When the box-type hearing aid is installed in the protective shell, the closing window covers the opening on the side of the protective shell and abuts against the surface of the box-type hearing aid.

[0005] In a preferred embodiment, the side of the box-type hearing aid is also provided with an adjustment button for controlling the volume of the receiver. The closed window surface near the adjustment button is provided with a button opening corresponding to the adjustment button. When the closed window is covered on the opening, the adjustment button protrudes outward from the closed window surface through the button opening. The protective outer shell surface is provided with inwardly recessed stepped edges at both the upper and lower ends near the sound transmission window. Magnetic strips are provided on the surface of the closed window at the corresponding positions of the two stepped edges. When the closed window is placed on the opening, the two magnetic strips are attracted to the two corresponding stepped edges respectively.

[0006] In a preferred embodiment, the width of the middle part of the fixing structure is smaller than the width of its two sides, the clamping part is located close to the human shoulder blade, and the clamping part is divided into multiple fitting parts by a cross groove in its middle part, and the multiple fitting parts are arranged in a rectangular array. The two adjacent mating parts on the bottom left and right sides are provided with mounting grooves. The mounting grooves are equipped with linkage triggers. Each linkage trigger is connected to a pull rope. The pull rope is set in the fixed structure, and the end of the pull rope away from the linkage trigger extends out of the fixed structure. When the pull rope is pulled, the linkage trigger protrudes out of the mating part surface.

[0007] In a preferred embodiment, the back of the box-type hearing aid is provided with a protrusion, the surface of the protrusion is provided with an adjustment groove, and the side of the adjustment groove is provided with a notch extending to the edge of the protrusion. The surface of the pull cord is fixed with an adjustment block that protrudes toward the adjustment groove. The adjustment block is located inside the protective shell, while the pull cord is located outside the adjustment button. When the box-type hearing aid is pushed in from the opening on the side of the protective shell and fixed inside the protective shell, the adjustment block slides into the adjustment groove through the notch. The lower part of the adjustment groove is provided with a trigger part. When the pull rope is pulled down to adjust the position of the adjustment block, the adjustment block squeezes the trigger part and controls the volume of the radio.

[0008] In a preferred embodiment, the triggering part includes a movable block, a spring, and a micro switch. The movable block is fixed to the lower surface of the adjustment groove by symmetrically arranged springs. The micro switch is disposed on the surface of the adjustment groove and corresponds to the pressing rod disposed at the lower end of the movable block. There is a gap between the micro switch and the pressing rod. When the pull rope is pulled down, the adjusting block squeezes the movable block, causing the pressing rod to press the micro switch to trigger and control the volume of the microphone.

[0009] In a preferred embodiment, the linkage trigger includes an inclined plate, a counterweight, and a fixed shaft. A groove is provided on the surface of the inclined plate near the fixed shaft, through which the fixed shaft passes. The counterweight is located at the end of the inclined plate away from the fixed shaft. The counterweight is inclined at one end near the fixed shaft. When the pull rope is pulled, the inclined plate swings counterclockwise around the fixed shaft, and the end of the inclined plate protrudes from the surface of the mating part. When the pull rope is not pulled, the inclined plate swings clockwise around the fixed shaft through the gravity generated by the counterweight at its end, and the end of the inclined plate retracts into the mounting groove.

[0010] Compared with existing technologies, this technical solution has the following advantages: This invention uses a fixing structure to secure the box-type hearing aid to the user's shoulder, avoiding the "rustling" sound caused by frequent friction between the wires and clothing when the hearing aid is placed in the chest or thigh pocket. The fixing structure is S-shaped, with its clamping part bent towards the fixing structure, allowing it to be securely held to shoulder clothing. The airbag conforms to the shoulder, enhancing wearing comfort and stability. Because the hearing aid unit is fixed to the shoulder, away from areas of frequent clothing movement, wire friction interference is significantly reduced. Furthermore, when users need to adjust the volume in noisy environments, they do not need to frequently remove the hearing aid; adjustments can be made remotely via external operation or Bluetooth connection, avoiding repeated removal and improving ease of use. This structure effectively solves the noise interference and operational inconvenience problems caused by improper placement in the prior art.

[0011] In this invention, users only need to lightly pull the cord attached to the collar or shoulder strap to remotely drive the adjustment block inside the hearing aid to move down, pressing the trigger part composed of a movable block, spring, and microswitch. This design completely solves the embarrassment and inconvenience of traditional methods that require touching the ear, significantly improving concealment and operational accessibility, especially meeting the actual needs of elderly and disabled users. Through the microswitch combined with timing recognition logic, such as single / double triggers corresponding to volume increase / decrease, bidirectional volume control is achieved without the need for additional sensors or wireless modules. The movable block is guided by symmetrical springs to ensure accurate pressing trajectory and avoid false triggering; while the microswitch itself has a clear action threshold and long lifespan, effectively overcoming the contact failure problem caused by moisture and oxidation of traditional potentiometers. The inclined plate and counterweight in the linkage trigger part form a lever system: the pull of the cord causes its end to bulge momentarily, providing clear tactile confirmation; after release, it automatically returns to its original position by gravity, eliminating continuous pressure. This zero-power, purely mechanical feedback method not only enhances operational confidence but also avoids the energy consumption and failure risks associated with electronic feedback components such as vibration motors. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0013] Figure 1 This is an overall diagram of the present invention.

[0014] Figure 2 This is a schematic diagram of a box-type hearing aid.

[0015] Figure 3 A structural diagram to protect the outer shell and the fixed structure.

[0016] Figure 4 A schematic diagram for protecting the outer casing.

[0017] Figure 5 This is a schematic diagram of a fixed structure.

[0018] Figure 6 This is a schematic diagram of a box-type hearing aid and its pull cord.

[0019] Figure 7 This is a schematic diagram showing the separation of the pull rope 13 from the adjustment groove.

[0020] Figure 8 This is a schematic diagram of the linkage trigger.

[0021] Figure 9 This is a schematic diagram of the tilted state of the linkage trigger.

[0022] In the diagram: 1. Fixed structure; 2. Box-type hearing aid; 3. Protective shell. 11. Airbag; 12. Clamping part; 13. Pull rope; 121 cross groove, 122 linkage trigger, 1221 mounting groove, 1222 inclined plate, 1223 counterweight, 1224 fixed shaft; Adjusting block 131; Adjustment button 21, microphone 22, adjustment groove 23, movable block 24, pressing rod 241, spring 25, micro switch 26; Closed window 31, button opening 311, magnetic strip 312, step edge 32, sponge sheet 33. Detailed Implementation

[0023] like Figures 1 to 9 As shown, the present invention proposes a Bluetooth box-type hearing aid, including a fixing structure 1, a box-type hearing aid 2, and a protective shell 3. The box-type hearing aid 2 is installed inside the protective shell 3, and the protective shell 3 is fixed to the human shoulder by the fixing structure 1. The fixing structure 1 is an S-shaped structure. The fixing structure 1 includes an airbag 11 and a clamping part 12. The airbag 11 is disposed at the end of the fixing structure 1 close to the protective shell 3, and the clamping part 12 is disposed at the end of the fixing structure 1 away from the protective shell 3. The clamping part 12 is bent toward the fixing structure 1. This invention uses a fixing structure 1 to secure the box-type hearing aid 2 to the user's shoulder, avoiding the "rustling" sound caused by frequent friction between the wires and clothing when the traditional box-type hearing aid is placed in the chest or thigh pocket. The fixing structure 1 is S-shaped, with its clamping part 12 bent towards the fixing structure, which can securely hold it to the shoulder clothing. The airbag 11 conforms to the user's shoulder, enhancing wearing comfort and stability. Because the hearing aid unit is fixed to the shoulder, away from areas of frequent clothing movement, wire friction interference is significantly reduced. Furthermore, when users need to adjust the volume in noisy environments, they do not need to frequently remove the hearing aid; they can adjust it remotely via external operation or Bluetooth connection, avoiding repeated removal and improving ease of use. This structure effectively solves the noise interference and operational inconvenience problems caused by improper placement in the prior art.

[0024] The protective shell 3 has an opening on one of its left or right sides. A sound transmission window is located on the surface of the protective shell 3 near the receiver 22 of the box-type hearing aid 2. A sponge sheet 33 covers the port of this sound transmission window. A closing window 31 is located near the sound transmission window on the protective shell 3. The closing window 31 is fixed to the side of the protective shell 3 by hinges. Spacing is provided between the upper and lower ends of the closing window 31 and the edge of the protective shell 3. When the box-type hearing aid 2 is installed inside the protective shell 3, the closing window 31 covers the opening on the side of the protective shell 3 and abuts against the surface of the box-type hearing aid 2. The closing window 31 can fix and limit the position of the box-type hearing aid 2, preventing it from loosening or falling off during use. Furthermore, the sponge sheet 33 can filter out some ambient noise while allowing effective sound to enter.

[0025] Furthermore, the side of the box-type hearing aid 2 is also provided with an adjustment button 21 for controlling the volume of the receiver 22. The surface of the closed window 31 near the adjustment button 21 is provided with a button opening 311 corresponding to the adjustment button 21. When the closed window 31 covers the opening, the adjustment button 21 protrudes outward from the surface of the closed window 31 through the button opening 311. The surface of the protective shell 3 is provided with inwardly recessed step edges 32 at both the upper and lower ends near the sound transmission window. Magnetic strips 312 are provided on the surface of the closed window 31 at the corresponding positions of the two step edges 32. When the closed window 31 covers the opening, the two magnetic strips 312 are attracted to the two corresponding step edges 32 respectively. A magnetic strip 312 is disposed on the surface of the closing window 31, matching the corresponding step edge 32 on the protective shell 3. When the closing window 31 covers the opening of the protective shell 3, the magnetic strip 312 and the step edge 32 are tightly adhered by magnetic attraction, making the closing window 31 securely closed. Since the box-type hearing aid 2 is housed inside the protective shell 3, the closing window 31 is pressed inward under the magnetic attraction, and its inner surface abuts against the side of the box-type hearing aid 2, thereby forming a lateral limit for the box-type hearing aid 2. This structure, while ensuring the reliable closure of the closing window 31, uses the clamping force generated by magnetic attraction to press the box-type hearing aid 2 firmly against the inner wall of the protective shell 3, preventing it from shaking or shifting during use, achieving a stable fixation and limiting effect.

[0026] Furthermore, the width of the middle section of the fixing structure 1 is smaller than the width of its two sides. The clamping part 12 is positioned close to the human shoulder blade, and the clamping part 12 is divided into multiple fitting parts by a cross groove 121 in its middle section. These multiple fitting parts are arranged in a rectangular array. Because the width of the middle section of the fixing structure 1 is smaller than that of its two sides, a narrow waist structure is formed, which can effectively reduce the contact area with non-critical areas of the shoulder, reduce the feeling of pressure, and at the same time concentrate the weight distribution on the area of ​​the shoulder with strong load-bearing capacity. The clamping part 12 is positioned close to the shoulder blade and is divided into multiple rectangular fitting parts by a cross groove 121 in the middle section. Each fitting part can deform slightly with the contour of the shoulder, improving the fit with the skin or clothing, enhancing the wearing stability, and dispersing local pressure, thereby reducing the burden on the shoulder.

[0027] Furthermore, each of the two adjacent mating surfaces on the bottom left and right sides is provided with a mounting groove 1221. A linkage trigger 122 is installed within the mounting groove 1221, and each linkage trigger 122 is connected to a pull cord 13. The pull cord 13 is located within the fixing structure 1, with one end of the pull cord 13 extending out of the fixing structure 1 away from the linkage trigger 122. When the pull cord 13 is pulled, the linkage trigger 122 protrudes from the mating surface. Additionally, the back of the box-type hearing aid 2 is provided with a protrusion, the surface of which is provided with an adjustment groove 23. The side of the adjustment groove 23 is provided with… There is a notch extending to the edge of the protrusion; the surface of the pull cord 13 is fixed with an adjustment block 131 protruding toward the adjustment groove 23. The adjustment block 131 is located inside the protective shell 3, while the pull cord 13 is located outside the adjustment button 21. When the box-type hearing aid 2 is pushed into the protective shell 3 through the opening on the side and fixed inside the protective shell 3, the adjustment block 131 slides into the adjustment groove 23 through the notch; a trigger part is provided at the lower part of the adjustment groove 23. When the pull cord 13 is pulled down to adjust the position of the adjustment block 131, the adjustment block 131 squeezes the trigger part and controls the volume of the receiver 22.

[0028] When the box-type hearing aid 2 is installed into the protective shell 3 of the fixing structure 1, the adjustment block 131 at the end of the pull cord 13 will automatically align and slide into the adjustment slot 23 on the back of the hearing aid, forming a precise mechanical linkage. This assembly process not only completes the physical fixation, but more importantly, it establishes a volume control path: the adjustment block 131 can slide vertically in the adjustment slot 23 and directly act on the elastic trigger part set at the bottom of the slot.

[0029] Based on the above, it can be seen that the user can pull the pull cord 13 on the outside of the shoulder to drive the adjustment block 131 to move downward, thereby squeezing the trigger part. The user can also send an electrical signal to the microphone 22 by squeezing the trigger part to control the volume of the microphone. The phrase "the trigger part sends an electrical signal to the microphone 22" is just a general term for the triggering method. The triggering method can be understood as converting the number of triggers into a volume adjustment command. For example, a single trigger in a short period of time is for increasing the volume, and two triggers in a short period of time are for decreasing the volume.

[0030] Furthermore, the triggering part includes a movable block 24, a spring 25, and a micro switch 26. The movable block 24 is fixed to the lower surface of the adjustment groove 23 by symmetrically arranged springs 25. The micro switch 26 is disposed on the surface of the adjustment groove 23 and corresponds to the pressing rod 241 disposed at the lower end of the movable block 24. There is a gap between the micro switch 26 and the pressing rod 241. When the pull rope 13 is pulled, the adjusting block 131 squeezes the movable block 24, causing the pressing rod 241 to press the micro switch 26 to trigger and control the volume of the microphone 22. When the user pulls the pull rope 13, the adjusting block 131 presses down the movable block 24, causing the pressing rod 241 at its lower protrusion to overcome the spring preload and accurately press the micro switch 26. Since the micro switch itself has a clear "on / off" threshold and fast response characteristics, it can effectively avoid false triggering caused by slight shaking or accidental touch, ensuring a clear signal output for each operation.

[0031] Furthermore, the linkage trigger 122 includes an inclined plate 1222, a counterweight 1223, and a fixed shaft 1224. The surface of the inclined plate 1222 is provided with a groove near the fixed shaft 1224, through which the fixed shaft 1224 passes. The counterweight 1223 is located at the end of the inclined plate 1222 away from the fixed shaft 1224. The end of the counterweight 1223 near the fixed shaft 1224 is inclined. When the pull rope 13 is pulled, the inclined plate 1222 swings counterclockwise with the fixed shaft 1224 as the fulcrum, and the end of the inclined plate 1222 protrudes from the surface of the mating part. When the pull rope 13 is not pulled, the inclined plate 1222 swings clockwise with the fixed shaft 1224 as the fulcrum due to the gravity generated by the counterweight 1223 at its end, and the end of the inclined plate 1222 retracts into the mounting groove 1221.

[0032] As can be seen from the above, in traditional box-type hearing aids, volume adjustment generally relies on physical knobs or buttons on the surface of the device. However, this design has obvious technical drawbacks: the operation position is close to the ear, requiring users to raise their hands to the side of their heads to adjust, which is easily noticed in public places and is extremely unfriendly to people with mobility impairments, hand tremors, or visual impairments; at the same time, the exposed mechanical structure is susceptible to corrosion from sweat and dust, leading to poor contact or jamming, affecting long-term reliability.

[0033] In this invention, the user only needs to gently pull the cord 13 that fits against the collar or shoulder strap to remotely drive the adjustment block 131 inside the hearing aid to move down, squeezing the trigger part composed of the movable block 24, spring 25 and micro switch 26. This design completely solves the embarrassment and inconvenience of having to touch the ear with the hand in the traditional method, significantly improving concealment and accessibility, especially meeting the actual needs of elderly and disabled users; By using a microswitch 26 in conjunction with timing recognition logic, such as single / double triggers corresponding to volume increase / decrease, bidirectional volume control is achieved without the need for additional sensors or wireless modules. The movable block 24 is guided by symmetrical springs 25, ensuring precise pressing trajectory and preventing false triggering. The microswitch itself possesses a clear action threshold and long lifespan, effectively overcoming the contact failure problem caused by moisture and oxidation in traditional potentiometers. The inclined plate 1222 and counterweight 1223 in the linkage trigger 122 form a lever system: pulling the rope causes its end to bulge momentarily, providing clear tactile confirmation; after release, it automatically returns to its original position by gravity, eliminating continuous pressure. This zero-power, purely mechanical feedback method not only enhances operational confidence but also avoids the energy consumption and failure risks associated with electronic feedback components such as vibration motors.

[0034] Specifically, the box-type hearing aid 2 is not permanently embedded in the protective shell 3 of the fixed structure 1, but is securely installed through a pluggable mechanical fit. When the user needs to wear it regularly, the box-type hearing aid 2 is inserted into the protective shell 3, and the adjustment clip 131 at the end of the pull cord 13 automatically aligns with and inserts into the adjustment slot 23 on the back of the hearing aid. At the same time, the linkage trigger 122 is in standby mode, and the entire set of remote volume adjustment and tactile feedback functions are activated. This is suitable for occasions where it is worn for a long time, requires frequent adjustments, or where discreet operation is desired.

[0035] When users are in situations such as temporary use, resting at home, or cleaning and maintaining the device, the hearing aid 2 can be easily removed from the protective casing 3. At this time, the hearing aid reverts to a standard independent device, retaining traditional physical volume buttons or knobs (not shown) on its main body, which users can adjust manually without relying on the cord system. This "dual-use" mode retains the compatibility of traditional operation while giving users the right to freely switch between usage methods according to actual needs.

[0036] The above description is merely a preferred embodiment of the present invention, and therefore should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made in accordance with the scope of the patent and the contents of the specification should still fall within the scope of the present invention.

Claims

1. A Bluetooth box-type hearing aid, characterized in that, It includes a fixing structure (1), a box-type hearing aid (2) and a protective shell (3), wherein the box-type hearing aid (2) is installed inside the protective shell (3), and the protective shell (3) is fixed to the human shoulder by the fixing structure (1); The fixing structure (1) is an S-shaped structure. The fixing structure (1) includes an airbag (11) and a clamping part (12). The airbag (11) is located at one end of the fixing structure (1) near the protective shell (3). The clamping part (12) is located at one end of the fixing structure (1) away from the protective shell (3). The clamping part (12) is bent toward the fixing structure (1). The protective shell (3) has an opening on one side of its left and right sides. A sound transmission window is provided on the surface of the protective shell (3) near the receiver (22) of the box-type hearing aid (2). The port of the sound transmission window is covered with a sponge sheet (33). A closed window (31) is provided on the protective shell (3) near the sound transmission window. The closed window (31) is fixed to the side of the protective shell (3) by a hinge. There is a gap between the upper and lower ends of the closed window (31) and the edge of the protective shell (3). When the box-type hearing aid (2) is installed in the protective shell (3), the closed window (31) covers the opening on the side of the protective shell (3) and abuts against the surface of the box-type hearing aid (2).

2. A Bluetooth cassette hearing aid according to claim 1, characterized in that The side of the box-type hearing aid (2) is also provided with an adjustment button (21) for controlling the volume of the receiver (22). The closed window (31) on the side near the adjustment button (21) is provided with a button opening (311) corresponding to the adjustment button (21). When the closed window (31) covers the opening, the adjustment button (21) protrudes outward from the surface of the closed window (31) through the button opening (311). The protective shell (3) has inwardly recessed step edges (32) at both ends near the sound transmission window. The closed window (31) has magnetic strips (312) at the corresponding positions of the two step edges (32). When the closed window (31) covers the opening, the two magnetic strips (312) are attracted to the two corresponding step edges (32).

3. A Bluetooth box-type hearing aid according to claim 2, characterized in that, The width of the middle part of the fixing structure (1) is smaller than the width of its two sides. The clamping part (12) is located close to the human shoulder blade. The clamping part (12) is divided into multiple fitting parts by the cross groove (121) in its middle part. The multiple fitting parts are arranged in a rectangular array. The two adjacent mating parts located at the bottom are provided with mounting grooves (1221). The mounting grooves (1221) are provided with linkage triggers (122). Each linkage trigger (122) is connected to a pull rope (13). The pull rope (13) is located in the fixed structure (1), and the end of the pull rope (13) away from the linkage trigger (122) extends out of the fixed structure (1). When the pull rope (13) is pulled, the linkage trigger (122) protrudes from the mating part surface.

4. A Bluetooth box-type hearing aid according to claim 3, characterized in that, The back of the box-type hearing aid (2) is provided with a protrusion, and the surface of the protrusion is provided with an adjustment groove (23). The side of the adjustment groove (23) is provided with a notch extending to the edge of the protrusion. The surface of the pull cord (13) is fixed with an adjustment block (131) that protrudes toward the adjustment groove (23). The adjustment block (131) is located inside the protective shell (3), while the pull cord (13) is located outside the adjustment button (21). When the box-type hearing aid (2) is pushed into the protective shell (3) from the opening on the side and fixed inside the protective shell (3), the adjustment block (131) slides into the adjustment groove (23) through the notch. The lower part of the adjustment groove (23) is provided with a trigger part. When the pull rope (13) is pulled down to adjust the position of the adjustment block (131), the adjustment block (131) squeezes the trigger part and controls the volume of the microphone (22).

5. A Bluetooth box-type hearing aid according to claim 4, characterized in that, The triggering part includes a movable block (24), a spring (25) and a micro switch (26). The movable block (24) is fixed to the lower surface of the adjustment groove (23) by the symmetrically arranged springs (25). The micro switch (26) is set on the surface of the adjustment groove (23) and corresponds to the pressing rod (241) set at the lower end of the movable block (24). There is a gap between the micro switch (26) and the pressing rod (241). When the pull rope (13) is pulled down, the adjusting block (131) squeezes the movable block (24), causing the pressing rod (241) to press the micro switch (26) to trigger and control the volume of the microphone (22).

6. A Bluetooth box-type hearing aid according to claim 5, characterized in that, The linkage trigger (122) includes an inclined plate (1222), a counterweight (1223), and a fixed shaft (1224). A groove is provided on the surface of the inclined plate (1222) near the fixed shaft (1224). The fixed shaft (1224) passes through the inclined plate (1222) through the groove. The counterweight (1223) is located at the end of the inclined plate (1222) away from the fixed shaft (1224). The counterweight (1223) is inclined at one end near the fixed shaft (1224). When the pull rope (13) is pulled, the inclined plate (1222) swings counterclockwise with the fixed shaft (1224) as the fulcrum, and the end of the inclined plate (1222) protrudes from the surface of the mating part. When the pull rope (13) is not pulled, the inclined plate (1222) swings clockwise with the fixed shaft (1224) as the fulcrum due to the gravity generated by the counterweight (1223) at its end, and the end of the inclined plate (1222) retracts into the mounting groove (1221).

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