| 主权项 |
1. A hearing protection device comprising:
an earplug body; and an adjustable sound attenuation assembly,wherein:
the earplug body comprises:
a canal portion that is insertable into an ear canal of an ear;a canal opening at a proximal end of the canal portion that opens into the ear canal when the canal portion is inserted into the ear canal; andan outer portion that is disposed in the concha bowl of the ear when the canal portion is inserted into the ear canal; the adjustable sound attenuation assembly comprises:
an attenuator case disposed in the earplug body; andan attenuator insert that is removably insertable into the attenuator case; the attenuator case comprises:
a hollow barrel portion that accommodates the attenuator insert therein; anda hollow extension portion connected to the hollow barrel portion, the hollow extension portion of the attenuator case being disposed in the canal portion of the earplug body; the hollow extension portion has a soundpath channel defined therethrough, the soundpath channel having a distal opening into the hollow barrel portion and a proximal opening opposite the distal opening, the soundpath channel defining a soundpath axis; the attenuator insert is rotatable within the hollow barrel portion of the attenuator case about an insert rotation axis, the insert rotation axis being noncollinear with the soundpath axis; the attenuator insert has a thickness along the soundpath axis that varies with respect to a rotation angle of the attenuator insert within the attenuator case; sound waves that enter the soundpath channel through the distal opening are attenuated proportionally to the thickness of the attenuator insert along the soundpath axis. |
