Patent US4235301A successfully refreshed from Google Patents.
US4235301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folded column speaker enclosure
Assignee: Individual
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Filing: 1979-06-04
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Granted: 1980-11-25
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Expires: 1999-06-04
Abstract
Abstract A loudspeaker enclosure for housing a basic speaker and providing a conduit for channeling the sound waves emitted from the back surface of the basic speaker so that the sound waves are shifted in phase and emerge from a port in the enclosure and add to, rather than acoustically cancel, the sound waves emitted from the front surface of the basic speaker. The sound waves from the back surface of the speaker travel through the length of the conduit which is folded through several 45° angles upon itself. These sound waves are directed through the conduit by striking and reflecting from a plurality of at least six reflector panels which are mounted at 45° angles. In this manner, due to the nature of reflections at 45° angles, each portion of a sound wave impulse travels the same distance as each other portion and the impulse emerges from the port basically intact. The enclosure has a unique shape because of the several foldings of the conduit through 45° angles. This unique shape enables the enclosure to comprise significantly less volume than a comparable conventional column enclosure necessary to obtain the same degree of sound wave phase shifting. This shape also enables the listener to position one or more such enclosures in numerous attitudes and configurations according to the listener's preferences in room decor and in sound blend and coverage.
Inventors
- 👤 Robert W. Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:51
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/2815; H04R1/2819
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
286 words
A loudspeaker enclosure device for reducing acoustical cancellation and enhancing the audible sound output connected to a source of audio signal and comprising: a basic speaker responsive to said audio signal for emitting sound waves from the front surface of said speaker into a listening area and from the back surface of said speaker into said enclosure; a substantially enclosed structure for defining a sound wave conduit, said structure comprising: a bottom panel extending in a horizontal plane substantially parallel to the floor; an end panel connected to said bottom panel and extending in a vertical plane substantially perpendicular to said bottom panel; said end panel having a speaker portion with a speaker opening for receiving said basic speaker and a port portion with a port opening for allowing sound waves emitted from said basic speaker into said structure to emerge from said structure; a top panel extending in a horizontal plane in parallel spaced relation to said bottom panel; a shelf extending in a horizontal plane between and in parallel spaced relation to said bottom and top panels and connected to said end panel; a pair of side panels extending in a vertical plane perpendicular to the plane of said end panel and connected to said bottom, top and end panels and said shelf; and, a plurality of at least six reflector panels connected to said structure for reflecting and directing the sound waves emitted into said structure from said basic speaker along a wave path through said conduit from said basic speaker to said port opening so that the sound wave emitted from said port opening is phase shifted and additive to the sound wave emitted from the basic speaker into the listening area.
Claim 2
Dependent Claim
286 words
A loudspeaker enclosure device for reducing acoustical cancellation and enhancing the audible sound output connected to a source of audio signal and comprising: a basic speaker responsive to said audio signal for emitting sound waves from the front surface of said speaker into a listening area and from the back surface of said speaker into said enclosure; a substantially enclosed structure for defining a sound wave conduit, said structure comprising: a bottom panel extending in a horizontal plane substantially parallel to the floor; an end panel connected to said bottom panel and extending in a vertical plane substantially perpendicular to said bottom panel; said end panel having a speaker portion with a speaker opening for receiving said basic speaker and a port portion with a port opening for allowing sound waves emitted from said basic speaker into said structure to emerge from said structure; a top panel extending in a horizontal plane in parallel spaced relation to said bottom panel; a shelf extending in a horizontal plane between and in parallel spaced relation to said bottom and top panels and connected to said end panel; a pair of side panels extending in a vertical plane perpendicular to the plane of said end panel and connected to said bottom, top and end panels and said shelf; and, a plurality of at least six reflector panels connected to said structure for reflecting and directing the sound waves emitted into said structure from said basic speaker along a wave path through said conduit from said basic speaker to said port opening so that the sound wave emitted from said port opening is phase shifted and additive to the sound wave emitted from the basic speaker into the listening area.
Claim 3
Dependent Claim
254 words
A loudspeaker enclosure as set forth in claim 1 further comprising: a first reflector panel adjacent said bottom panel and rotated 45° from the plane of said end panel about an axis of rotation defined as the line of intersection of said first reflector panel and said bottom panel; a second reflector panel adjacent and normal to said first reflector panel and rotated 45° from the plane of said end panel about an axis of rotation defined as the line of intersection of said second reflector panel and said top panel; a third reflector panel adjacent said top panel and lying in a plane normal to said bottom panel, said third reflector panel being rotated 45° from the plane of said end panel about an axis of rotation defined as the line of intersection of said third reflector panel and one of said side panels; a fourth reflector panel adjacent and normal to said third reflector panel, said fourth reflector panel is adjacent to said top panel and lying in a plane normal to said bottom panel which is rotated 45° from the plane of said end panel about an axis of rotation defined as the line of intersection of said third and fourth reflector panels; a fifth reflector panel adjacent said top and second reflector panels and lying in the same plane as said second reflector panel; and a sixth reflector panel adjacent and normal to said fifth reflector panel and adjacent and lying in the same plane as said first reflector panel.
Claim 4
Dependent Claim
50 words
A loudspeaker enclosure as set forth in claim 2 further comprising a mid-range speaker responsive to said audio signal for emitting sound waves, said mid-range speaker disposed adjacent one of said reflector panels at a position substantially midway on said wave path between said basic speaker and said port opening.
Claim 5
Dependent Claim
47 words
A loudspeaker enclosure as set forth in claim 3 wherein said structure further comprises a hollow member connected to one of said reflector panels for receiving said mid-range speaker and for channeling the sound waves emitted from the back surface of said mid-range speaker into said structure.
Claim 6
Dependent Claim
35 words
A loudspeaker enclosure as set forth in claim 4 wherein an end of said hollow member lies in a plane parallel to the plane of said end panel, said end for receiving said mid-range speaker.
Claim 7
Dependent Claim
39 words
A loudspeaker enclosure as set forth in claim 2 wherein said structure further comprises a partition extending in a plane between and in parallel spaced relation to said side panels for supporting said shelf and further defining said conduit.
Claim 8
Dependent Claim
22 words
A device as set forth in claim 2 or 6 wherein said structure is formed of a first and second molded members.
Claim 9
Dependent Claim
48 words
A loudspeaker enclosure as set forth in claim 7 wherein said first member comprises at least said side and bottom panels, and said first, second, fifth, and sixth reflector panels, and said second member comprises at least said end and top panels, shelf, third, and fourth reflector panels.
Claim 10
Dependent Claim
39 words
A loudspeaker enclosure as set forth in claim 2 further comprising a frontal portion of said structure defined as comprising the end panel, and said third and fourth reflector panels, and a high-frequency speaker connected to said frontal portion.
References Cited (Backward Citations)
US2476572A
Cited
US2491982A
Cited
US2646852A
Cited
US2822884A
Cited
US3186509A
Cited
US3241631A
Cited
US3235028A
Cited
US3627948A
Cited
US3608665A
Cited
US3816672A
Cited
US4168761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |