# US 11,115,744 B2 · Audio device with conduit connector > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,115,744 B2 - Document ID: US11115744B2 - Status: Granted - Kind: B2 - Application number: 16/371,484 - Filed: 2019-04-01 - Published: 2019-10-03 - Granted: 2021-09-07 - Earliest claimed: 2018-04-02 - Assignees: Knowles Electronics, LLC - Applicants: Knowles Electronics, LLC - Inventors: Brenno Varanda; Shehab Albahri - Web page: https://patentgrep.com/patent/US11115744B2 ## CPC - H04R 1/1016: {Earpieces of the intra-aural type} - H04R 25/609: {of circuitry (of electronic switches or control elements H04R25/603)} - H04R 1/1033: {Cables or cables storage, e.g. cable reels (cord reels per se H02G11/02; arrangements for storing and repeatedly paying-out and re-storing lengths of conductors or cables B65H75/34; extensible conductors or cables, e.g. self-coiling cords H01B7/06)} - H04R 1/1066: {Constructional aspects of the interconnection between earpiece and earpiece support (earpiece support for monophonic headphones H04R1/105; earpiece support for stereophonic headphones H04R5/0335)} - H04R 25/45: {Prevention of acoustic reaction, i.e. acoustic oscillatory feedback} - H04R 25/604: {of acoustic or vibrational transducers} - H04R 2225/0216: BTE hearing aids having a receiver in the ear mould - H04R 2225/57: Aspects of electrical interconnection between hearing aid parts - H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K) ## Abstract A hearing device includes a housing with a retention flange defining a retention space. A conduit is disposed about an electrical wire electrically coupled to a transducer and a ferrule is disposed about an end portion of the conduit and fixed along an axial dimension of the conduit, the ferrule having a portion disposable in the retention space. A bushing has a portion disposed at least partially about the portion of the ferrule disposable in the retention space, the bushing formed of a soft material relative to a hardness of the ferrule and the housing, wherein the bushing is located between the retention flange and the ferrule and the retention flange captures the conduit relative to the housing when the portion of the bushing is disposed in the retention space. ## Claims ### Claim 1 A hearing device comprising: a housing having a sound opening disposed in a portion configured to contact a user's ear; a sound-producing electro-acoustic transducer disposed in the housing, the transducer configured to generate an acoustic signal in response to an electrical excitation signal applied thereto, wherein the acoustic signal generated by the transducer emanates into the user's ear via the sound opening; a retention flange coupled to the housing, the retention flange defining a retention space; a conduit disposed about an electrical wire electrically coupled to the transducer; a ferrule disposed about an end portion of the conduit, and the ferrule fixed along an axial dimension of the conduit; a bushing having a portion disposed at least partially about at least a portion of the ferrule, the bushing formed of a soft material relative to a hardness of a material of the ferrule, at least the portion of the bushing disposed in the retention space and captured by the retention flange, wherein at least a portion of the bushing is located between the retention flange and at least the portion of the ferrule, and wherein the conduit is fixed relative to the housing. ### Claim 2 (depends on 1) The hearing device of claim 1, the ferrule includes a first flange portion and a second flange portion separated by a recess, the bushing is at least partially disposed in the recess of the ferrule, wherein the bushing is located between the retention flange and the first and second flange portions of the ferrule, and wherein the retention flange includes a flange portion disposed between the first and second flange portions of the ferrule when the portion of the bushing is disposed in the retention space. ### Claim 3 (depends on 2) The hearing device of claim 2, the end portion of the conduit about which the ferrule is disposed is located at least partially in the retention space, wherein an axial dimension of the ferrule is aligned with an axial dimension of the conduit. ### Claim 4 (depends on 2) The hearing device of claim 2, the bushing comprises a first annular member disposed about the ferrule in the recess and a second annular member disposed about the ferrule in the recess, the first annular member disposed between the first flange portion of the ferrule and the flange portion of the retention flange and the second annular member disposed between the second flange portion of the ferrule and the flange portion of the retention flange. ### Claim 5 (depends on 4) The hearing device of claim 4, the end portion of the conduit about which the ferrule is disposed is located at least partially in the retention space, wherein an axial dimension of the ferrule is aligned with an axial dimension of the conduit. ### Claim 6 (depends on 4) The hearing device of claim 4, the flange portion of the retention flange includes a generally convex surface, wherein the first annular member is disposed between the first flange portion of ferrule and a first surface portion of the retention flange and the second annular member is disposed between the second flange portion of the ferrule and a second surface portion of the retention flange. ### Claim 7 (depends on 2) The hearing device of claim 2, the end portion of the conduit about which the ferrule is disposed is not disposed in the retention space. ### Claim 8 (depends on 2) The hearing device of claim 2, wherein the conduit is rotationally fixed in the retention space of the hearing device. ### Claim 9 (depends on 1) The hearing device of claim 1, the retention flange includes a first flange portion and a second flange portion separated by a recess, the bushing is disposed at least partially in the recess of the retention member, wherein the bushing is located between the ferrule and the first and second flange portions of the retention flange, and wherein the ferrule is captured between the first and second flange portions of the retention flange when the portion of the bushing is disposed in the retention space. ### Claim 10 (depends on 9) The hearing device of claim 9, the end portion of the conduit about which the ferrule is disposed is located at least partially in the retention space, wherein an axial dimension of the ferrule is aligned with an axial dimension of the conduit. ### Claim 11 (depends on 9) The hearing device of claim 9, the bushing comprises a first annular member seated in a first recess of the ferrule and a second annular member seated in a second recess of the ferrule, the first recess spaced apart from the second recess, the first annular member disposed between the first flange portion of the retention flange and the ferrule and the second annular member disposed between the second flange portion of the retention flange and the ferrule. ### Claim 12 (depends on 11) The hearing device of claim 11, the end portion of the conduit about which the ferrule is disposed is located at least partially in the retention space, wherein an axial dimension of the ferrule is aligned with an axial dimension of the conduit. ### Claim 13 (depends on 1) The hearing device of claim 1 further comprising anti-rotation structure that prevents rotation of the conduit relative to the housing. ### Claim 14 (depends on 1) The hearing device of claim 1, the ferrule has a non-circular shape when the ferrule is viewed along the axial dimension of the conduit, the ferrule rotationally fixed to the conduit, wherein the non-circular shape prevents rotation of the ferrule relative to the housing. ### Claim 15 (depends on 1) The hearing device of claim 1, the ferrule rotationally fixed to the conduit, the retention flange and the ferrule having complementary shapes that limit rotation of the conduit relative to housing. ### Claim 16 (depends on 1) The hearing device of claim 1 further comprising an external bushing sleeve bonded to the conduit and to a portion of the housing defining the retention space. ### Claim 17 (depends on 1) The hearing device of claim 1, wherein the portion configured to contact the user's ear is an ear tip configured for insertion at least partially into the user's ear canal. ### Claim 18 (depends on 15) The hearing device of claim 15, the housing is a transducer housing including a cup and a cover, wherein the retention flange extends from the transducer housing. ### Claim 19 (depends on 15) The hearing device of claim 15, the transducer includes a transducer housing disposed within the housing, wherein the retention flange extends from the housing. ### Claim 20 An electrical conduit strain relief structure for a hearing device having a retention flange defining a retention space, the strain relief structure comprising: a conduit connectable to the hearing device; a ferrule disposed about an end portion of the conduit, the ferrule fixed rotationally relative to the conduit, and the ferrule fixed along an axial dimension of the conduit; a bushing having a portion disposed at least partially about at least a portion of the ferrule, the bushing formed of a soft material relative to a hardness of a material of the ferrule, at least the portion of the bushing, disposed about at least the portion of the ferrule, disposable and retainable in the retention space, wherein, when the bushing is disposed in the retention space, at least a portion of the bushing is located between the retention flange and at least the portion of the ferrule and the conduit is fixed relative to the hearing device.