Patent US3642091A successfully refreshed from Google Patents.
US3642091A
Expired / Lapsed
US
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Underground acoustic device
Assignee: Pioneer Corp
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Filing: 1969-10-09
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Granted: 1972-02-15
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Expires: 1989-10-09
Abstract
Abstract An underground acoustic device for radiating sound into the atmosphere has a casing with a folded horn within the same, the casing constituting a tubular member, for example, a cylinder, an inverse truncated cone, a prism, or an inverse truncated pyramid. The hollow tubular casing defines a cavity with a speaker and a folded horn integral therewith supported at the center of the casing bottom to radiate sound upwardly towards the atmosphere. The bottom of the casing is configured to radiate sound upwardly and outwardly through a series of holes in a cover overlying the casing opening. In turn, the center of the cover is provided with a cover with a conical projection facing the speaker hole and acting in conjunction with a cup or cylindrical extension larger in diameter than the speaker horn for reflecting sound downwardly toward the curved reflecting surface of the bottom of the cavity. A drain pipe extends from the inside of the casing to the underground and a net lies intermediate the ends thereof for preventing rats from entering the casing.
Inventors
- 👤 Shunji Nohara
- 👤 Hideo Watanabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:01
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/32; H04R1/34; H04R1/345; H04R1/02; H04R1/028
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
154 words
An underground acoustic device for radiating sound from the ground into the atmosphere comprising: a hollow tubular member positioned within the ground, means including said hollow tubular member defining a cavity with an upper opening, a speaker including a horn coaxially positioned within and fixed to the bottom of said means defining said cavity with the speaker horn facing upwardly towards said opening of said hollow tubular member, the bottom of said cavity being curved to form a path for the sound, a cover overlying the open upper end of said hollow tubular member and carrying multiple holes for passing the sound therethrough except at the center portion thereof, a conical projection beneath and at the center of the cover, a cup-shaped generally cylindrical, sound-reflecting horn concentrically surrounding said conical projection for reflecting the sound radiated from said speaker toward the sound-reflecting curved surface of the cavity bottom, theNce outwardly through said multiple holes.
Claim 2
Dependent Claim
154 words
An underground acoustic device for radiating sound from the ground into the atmosphere comprising: a hollow tubular member positioned within the ground, means including said hollow tubular member defining a cavity with an upper opening, a speaker including a horn coaxially positioned within and fixed to the bottom of said means defining said cavity with the speaker horn facing upwardly towards said opening of said hollow tubular member, the bottom of said cavity being curved to form a path for the sound, a cover overlying the open upper end of said hollow tubular member and carrying multiple holes for passing the sound therethrough except at the center portion thereof, a conical projection beneath and at the center of the cover, a cup-shaped generally cylindrical, sound-reflecting horn concentrically surrounding said conical projection for reflecting the sound radiated from said speaker toward the sound-reflecting curved surface of the cavity bottom, theNce outwardly through said multiple holes.
Claim 3
Dependent Claim
20 words
An underground acoustic device as set forth in claim 1, wherein said hollow tubular member is of cylindrical prism shape.
Claim 4
Dependent Claim
23 words
An underground acoustic device as set forth in claim 1, further comprising a drain channel formed around said cover at the edge thereof.
Claim 5
Dependent Claim
39 words
An underground acoustic device as set forth in claim 1, wherein the bottom of said cavity is formed by the ground and said ground includes salt as a component thereof for varying the quality of the sound reflected therefrom.
Claim 6
Dependent Claim
35 words
An underground acoustic device as set forth in claim 1, wherein said multiple holes are inclined radially outwards towards the periphery of the cover to control the direction of sound radiated from the acoustic device.
Claim 7
Dependent Claim
16 words
An underground acoustic device as set forth in claim 1, wherein said speaker is a woofer.
Claim 8
Dependent Claim
54 words
An underground acoustic device as set forth in claim 6, further comprising an illumination lamp standing on the center portion of said cover and having a base formed with a reflecting surface or reflecting the woofer sound radiated from said woofer speaker and a plurality of waterproof tweeter speakers provided on said reflecting surface.
Claim 9
Dependent Claim
28 words
An underground acoustic device as set forth in claim 7, wherein said illumination lamp comprises a mercury-arc lamp having a cover formed by acryl resin overlying the same.
Claim 10
Dependent Claim
33 words
An underground acoustic device as set forth in claim 7, wherein the holes within said cover are inclined in the direction of the cover periphery to direct the sound as individual acoustic reflectors.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-14 | 1975-08-16 | 1976-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-14 | 1979-08-16 | 1980-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-14 | 1983-08-16 | 1984-02-15 | $7700.00 | Window Closed / Lapsed |