Protective cover for sound transducers located in face masks of

Details Protective cover for sound transducers located in face masks of Protective cover for sound transducers located in face masks of

1977-04-14

1978-10-31

Claffy, Kathleen H.

Communications: electrical

Land vehicle alarms or indicators

Internal alarm or indicator responsive to a condition of the...

340 8PC, 181149, H04R 102

Patent

active

041236220

ABSTRACT:
A moisture protective housing for a sound transducer located inside the face mask of a diver which face mask is vented to a breathing apparatus, such as a scuba tank with regulator, to maintain the air breathed by the diver at substantially the same pressure as the water surrounding the diver. The housing includes a deformable portion having pin prick perforations or pores therethrough to make that portion porous when formed. The number of perforations or pores, as well as their size, are selected such that the porous portion becomes permeable to air and/or water only if the pressure differential across it exceeds a preselected value.

REFERENCES:
patent: 3789166 (1974-01-01), Sebesta
patent: 3987258 (1976-10-01), Tsutsui

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