Communications: electrical – Selective – Having indication or alarm
Patent
1974-04-08
1976-02-17
Bentley, Stephen C.
Communications: electrical
Selective
Having indication or alarm
310 9, 310 6, 340 10, H04B 1300
Patent
active
039394670
ABSTRACT:
An electroacoustical transducer is disclosed as incorporating a metallic sing having an aperture located in the wall thereof. A plurality of shutters are rotatably mounted on said housing for effectively and timely opening and closing predetermined portions of said aperture. A plastic support member is disposed within said housing, and a slot is located therein in alignment with said aperture. A wooden frame is disposed in said slot in such manner as to effect a semi-resilient lining therefor, and an electroacoustical energy converter element is disposed within said frame lining. A shutter actuator, either programmed or manually operated, is connected to said plurality of shutters for respectively moving them in such manner as to effect predetermined openings and closings of the aforesaid aperture. A utilization apparatus, such as for example, a sonar transceiver, is connected to the aforesaid energy converter element for energization thereof and for response thereto during transmit and receive modes of operation, respectively.
REFERENCES:
patent: 2520938 (1950-09-01), Klein
patent: 2689947 (1954-09-01), Fry
patent: 2716708 (1955-08-01), Bradfield
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patent: 3359537 (1967-12-01), Geil et al.
patent: 3603921 (1971-09-01), Dreisback
patent: 3833825 (1974-09-01), Haan
patent: 3854060 (1974-12-01), Cook
Cook Rufus L.
Warner Henry L.
Bentley Stephen C.
David Harvey A.
Doty Don D.
Sciascia Richard S.
The United States of America as represented by the Secretary of
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