Apparel – Head coverings – Convertible
Patent
1997-11-17
1999-07-13
Calvert, John J.
Apparel
Head coverings
Convertible
2423, 181129, A42B 106
Patent
active
059209119
ABSTRACT:
A high performance hearing protection or communications earcup and seal is disclosed that takes advantage of the facts that a characteristic acoustic impedance mismatch at a boundary will reflect a large portion of impinging energy rather than absorb it, and the "pumping" action on an elastomeric boundary from cyclic acoustic pressure can be damped by placing damping materials adjacent to that boundary. The preferred embodiment of the hearing protection earcup seal of the instant invention interleaves damping materials between the plurality of concentric ring structures of the instant invention and places thinned edges on individual concentric ring structures to enhance seal conformation with obstacles such as eyeglass temple pieces. An elastomeric semi-annular tensile plate supports the concentric ring structures of the instant invention. Both the earcup and earcup seal of the instant invention are readily manufacturable with conventional tooling.
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Physical & Applied Acoustics an Introduction by Erwin Meyer & Ernst-Georg Neumann Section 1.4.
Calvert John J.
Patel Tejash D
Poiesis Research, Inc.
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