US3833880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Very low frequency sonar projector
Assignee: United States Department of the Navy
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Filing: 1973-02-26
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Granted: 1974-09-03
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Expires: 1993-02-26
Abstract
Abstract A low-cost projector of acoustic energy is fabricated from an elongate block of wood provided with a cavity. A cover, also made of wood, is fitted over the cavity and a motor-driven rotary electric vibrator is secured to the elongate block via a plurality of bolts. The wooden cover is coupled to the vibrator by several resilient vibration isolation mounts and the block and cover are encased in a resilient sleeve clamped at opposite ends. Thusly constructed and additionally provided with a coaxial duct through which the towing and power cables reach, a low-cost, high-energy projector of acoustic energy is provided which is capable of being operated at very low frequencies due to the selectivity of vibrator driving speeds and of the stiffness of the resilient vibration mounts.
Inventors
- 👤 F Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:54
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/004; G10K11/006; G01; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
205 words
A projector transducer of acoustic energy comprising: means for providing a radiating surface for said acoustic energy including an elongate first member having a cavity therein, having its opposite ends shaped to reduce hydrodynamic interaction, and shaped with a coaxial duct extending from said cavity to one of the ends and a second member sized to cover said cavity and shaped to further reduce hydrodynamic interaction, said second member is adapted for independent opposite vibratory motion with respect to said first member; a resilient sleeve enclosing a portion of the elongate first member and all of said second member; means for bearing the tensile load created as said transducer is pulled through the water disposed in said coaxial duct; a motor-driven rotary electric vibrator having two sets of parallel mounting bores disposed at opposite ends for producing vibratory motion disposed in said cavity, said first member and said second member are selected from materials and said cavity is dimensioned to render said transducer neutrally buoyant; means for rigidly securing the motor-driven rotary electric vibrator to said first member; and means for resiliently mounting the motor-driven rotary electric vibrator onto said second member to ensure the projection of said acoustic energy responsively to said vibratory motion.
Claim 2
Dependent Claim
205 words
A projector transducer of acoustic energy comprising: means for providing a radiating surface for said acoustic energy including an elongate first member having a cavity therein, having its opposite ends shaped to reduce hydrodynamic interaction, and shaped with a coaxial duct extending from said cavity to one of the ends and a second member sized to cover said cavity and shaped to further reduce hydrodynamic interaction, said second member is adapted for independent opposite vibratory motion with respect to said first member; a resilient sleeve enclosing a portion of the elongate first member and all of said second member; means for bearing the tensile load created as said transducer is pulled through the water disposed in said coaxial duct; a motor-driven rotary electric vibrator having two sets of parallel mounting bores disposed at opposite ends for producing vibratory motion disposed in said cavity, said first member and said second member are selected from materials and said cavity is dimensioned to render said transducer neutrally buoyant; means for rigidly securing the motor-driven rotary electric vibrator to said first member; and means for resiliently mounting the motor-driven rotary electric vibrator onto said second member to ensure the projection of said acoustic energy responsively to said vibratory motion.
Claim 3
Dependent Claim
37 words
A transducer according to claim 1 in which the bearing means is a sealed fitting carried in said coaxial duct coupled to a towing cable having the capability for feeding electric power to the vibratory motion means.
Claim 4
Dependent Claim
139 words
A transducer according to claim 2 in which the first member is cigar-shaped and is provided with a pair of circumferentially disposed recesses each having holes reaching into said cavity and aligned with said two sets of parallel mounting bores and the rigidly securing means is a center portion of a vibration isolation mount and a pair of U-shaped elements, the curved portions of which are formed to fit into the circumferentially disposed recesses and the legs of which are threaded and formed to extend through said holes into said cavity and through said mounting bores in the motor-driven rotary electric vibrator, upon being so extended and disposed a separate securing nut is threaded onto each leg and brought to bear on each said rigid center portion to rigidly secure said motor-driven rotary electric vibrator to said first member.
Claim 5
Dependent Claim
72 words
A transducer according to claim 3 in which the resiliently securing means is an annular resilient portion and a rigid outer portion of said vibration isolation mount, said annular resilient portion is bonded between said rigid center portion and said rigid outer portion and a plurality oF mounting bolts interconnect the rigid outer portion to the rectangular second member thereby resiliently coupling said motor-driven rotary electric vibrator to the rectangular second member.
Claim 6
Dependent Claim
36 words
A transducer according to claim 4 in which there are four vibration isolation mounts each coupled as aforedescribed to rigidly and resiliently couple the motor-driven rotary electric vibrator to the first member and second member, respectively.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |