Semi-Insert Hearing Protector Having a Helmholtz-Type Resonator

Jozef J. Zwislocki (Inventor)

Research output: Patent

Abstract

A semi-insert hearing protector includes a thin-walled enclosure sized substantially to that of the outer ear of a wearer, the enclosure being made from a rigid or semi-rigid material and secured to the head of said wearer by means of an adjustable headband. A short tube extends from the enclosure for communication with the ear canal, the short tube being made from a rigid or semi-rigid material and including a flexible cuff disposed over the tube made from a resilient material. The enclosure contains sound absorbing material configured to vary the frequency characteristic of sound attenuation by the semi-insert.
Original languageEnglish (US)
Patent number8,107,638
StatePublished - Sep 17 2009

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  • Cite this

    Zwislocki, J. J. (2009). Semi-Insert Hearing Protector Having a Helmholtz-Type Resonator. (Patent No. 8,107,638).