Nonlinear ear protecting device

Details Nonlinear ear protecting device Nonlinear ear protecting device

1983-03-11

1984-08-14

Hix, L. T.

Acoustics

Anatomic or prosthetic relation

Ear and mouth

179182R, N04R 2500

Patent

active

044651597

ABSTRACT:
An ear protecting device for protecting a wearer from annoying and/or damaging noise levels. The device is comprised of a connecting member and a pair of muffs suitable for covering a wearer's ears. The muffs are suspended from opposite portions of the connecting member. The muffs are each comprised of a cup and an earseal cushion. The muffs are characterized by greater attenuation in high intensity environments than in low intensity environments. Each muff has a cup which is at least partially porous. Each muff has a specific airflow resistance of from between 3,000 and 105,000 SI rayls. At least one porous portion of each cup defines a tortuous path. The mean pore size of this porous portion is at least 160 micrometers.

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M. R. Forrest, Laboratory Dev. of an Amplitude-Sensitive Ear Plug, Oct. 1969.
M. R. Forrest, R. R. A. Coles, Problems of Communication and Ear Protection in the Royal Marines, (1970).
J. Zwislocki, New Types of Ear Protectors, (1952).
A. M. Martin, Dependence of Acoustic Attenuation of Hearing Protectors on Incident Sound Level, (1979).

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