Patent ID: 8931489
Filing Date: 2015-01-13
Classification: A61F

Abstract:
1. A hearing protection device comprising: an earplug body; and an adjustable sound attenuation assembly, wherein: the earplug body comprises: the adjustable sound attenuation assembly comprises: the attenuator case comprises: 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; and the thickness of the attenuator insert along the soundpath axis is defined by a distance from a flat proximal end of the attenuator insert to a sloped distal surface of the attenuator insert, the sloped distal surface having a gradual slope from a zero-attenuation groove of the attenuator insert to a maximum attenuation portion of the attenuator insert.