Sound-attenuating earmuff having isolated double-shell structure
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United States of America Patent
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Dec 21, 2010
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app pub date -
Jan 22, 2010
filing date -
Dec 4, 2006
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Abstract
An earmuff assembly with a double-shell structure is disclosed for use with a sound-attenuating circumaural headset. The earmuff assembly comprises a cup-shaped outer shell mounted on a resilient outer sealing ring and a cup-shaped inner shell mounted on a resilient inner sealing ring. By means of the two sealing rings the outer and the inner shells are brought into abutment with the head surface around an ear of a wearer. Both shells are structurally rigid. The sound attenuation performance is maximized by isolating the inner shell from the outer shell.
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