Headphone with cord take-up device
US7492917B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 21, 2005 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Apr 28, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/10
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
In a headphone, accidental winding and retracting is prevented from occurring without requiring complicated operations. The headphone includes housings incorporating an electro-acoustic transducer element, an input cord, one end of which is connected to the electro-acoustic transducer element. A take-up mechanism is incorporated in the housings and energized to wind and retract the input cord into the housings. A ratchet interacts with the take-up mechanism to prevent the winding and retracting of the input cord by the take-up mechanism. A cancellation mechanism prevents the winding and retracting of the input cord by the ratchet. An ear-hook having an ear-hook arm hooks the housing on the arm and is energized toward the housings, wherein when the ear-hook arm is away from the housings so the prevention of the winding and retracting of the input cord by the ratchet is not cancelled.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.