Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1991-04-19
1992-02-25
Tudor, Harold J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367149, 367173, 310337, H04R 1700
Patent
active
050918923
ABSTRACT:
An expandable sonar array structure includes a central body with a plurality of radially extendable hydrophone support arm assemblies attached to said body and including a motor-driven drive member to which all the arm assemblies are attached through pushrods. Each arm assembly includes three substantially vertically aligned, radially extending arms carrying hydrophones with top and bottom arms attached to the pushrods through short arms with pivots chosen so that the arms move in opposite directions. The center arm is attached to the lower arm by means of a link which closes a parallelogram arrangement such that the center arm moves essentially in parallel with the lower arm. An additional arm is pivotally attached to the outboard end of the center arm and extends the center arm to essentially the diameter of the upper and lower arms, and its outboard end is attached through a link to the outside end of the upper arm.
REFERENCES:
patent: 3566346 (1971-02-01), Scopatz
patent: 3886491 (1975-05-01), Jonkey et al.
Allied-Signal Inc.
Miller Terry L.
Tudor Harold J.
Walsh Robert A.
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