Acoustics – Anatomic or prosthetic relation – Ear and mouth
Patent
1999-08-10
2000-07-04
Dang, Khanh
Acoustics
Anatomic or prosthetic relation
Ear and mouth
128868, A61B 702
Patent
active
060824859
ABSTRACT:
An earplug has a rotationally adjustable gating mechanism for adjustable attenuation of treble sounds. The plug includes a conventional earplug foam body for conforming to and wedging in the ear canal. This earplug foam body includes at least a partial aperture axially of the plug leading from the exterior of the ear canal toward the interior of the car canal with its hearing sense. A two-part counter rotating gating member fits to the aperture of the earplug. One part of the two part counter rotating gating member has a conical through aperture concentric to the earplug and ear canal. This conical through aperture is partially obstructed by an eccentrically mounted gate. The remaining part of the two part counter rotating gating member defines a rotating cover over the conical aperture and defines at least one and preferably a plurality of sound apertures enabling sound to pass from the exterior of the earplug into the conical aperture. These sound apertures are eccentrically mounted with respect to the conical aperture and the relative rotation to come into and out of registry with the eccentrically mounted gate. The two-part counter rotating gating member has an interference fit into the aperture of the earplug. When the earplug foam body is wedged into the ear, upon relative rotation of the cover with respect to the seat, the sound apertures rotate into and out of registry with the gate. There results an earplug assembly, which can selectively attenuate the treble sounds causing ear discomfort.
REFERENCES:
patent: 3702123 (1972-11-01), Macken
patent: 3934100 (1976-01-01), Harada
patent: 5332871 (1994-07-01), Carrigan
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