Device for emitting acoustic waves in a liquid medium

Details Device for emitting acoustic waves in a liquid medium Device for emitting acoustic waves in a liquid medium

1973-11-20

1978-07-25

Schwadron, Martin P.

Communications: electrical

Selective

Pulse responsive actuation

92 20, 92 84, 92129, 91 44, 181119, 340 8R, H04R 2302

Patent

active

041032802

ABSTRACT:
This device comprises two movable elements of rigid material tightly interconnected by means of a deformable membrane forming therewith a tight internal enclosure, means for varying abruptly the volume of said enclosure by successively moving the two elements away from each other, maintaining them in spaced relationship and allowing them to be urged toward each other by the effect of the external hydrostatic pressure, in which the means for moving the two elements away from each other includes two cylinders and at least one piston slidable in one of said cylinders, associated to one of said movable elements and also to a push-member slidable in one of the cylinders and bearing on the other movable element and means for feeding said cylinder with pressurized fluid so as to maintain the elements in spaced relationship or to release them.

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patent: 3642089 (1972-02-01), Parker et al.
patent: 3642089 (1972-02-01), Parker et al.
patent: 3676840 (1972-07-01), Bays
patent: 3792425 (1974-02-01), Magneville et al.
patent: 3858485 (1975-01-01), Rosaen

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