Patent US3680936A successfully refreshed from Google Patents.
US3680936A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stereo sound reproduction system
Assignee: Individual
•
Filing: 1970-03-05
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Granted: 1972-08-01
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Expires: 1990-03-05
Abstract
Abstract This specification describes a stereo sound reproduction system in which the speakers are mounted separately from the main cabinet, the cabinet being provided with recesses for storage of the speakers when not in use, and being further provided with linkage means connected between the cabinet and the speakers which is extendable and retractable by means of which the speakers may be moved away from the cabinet, while remaining supported on the linkage, and further describes such a system in which the while remaining supported on the linkage, and further describes such a system linkage is power operated and may be provided with movement limiting means whereby a predetermined amount of speaker movement may be preselected, and the speakers moved out to such a position by merely pressing a switch.
Inventors
- 👤 Peter Heinz Backhaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:25
CPC Classifications
A; A47; A47B; A47B81/00; A47B81/06; A47B81/061; A47B81/062; A47B46/00; A47B81/065
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
256 words
Stereo sound reproduction apparatus of the type having at least two speakers and sound reproduction channel means connected thereto, said apparatus comprising; main cabinet means having symmetrical front and back panel means of equal length, and two ends; speaker unit recesses formed within the interior of said main cabinet means at each end thereof between said front and back panel means; openings in said ends of said cabinet means giving access to said speaker unit recesses, said openings being concealed from the front of said main cabinet means by said front panel means; two speaker units having outer and inner ends shaped and dimensioned to fit within the interior of said main cabinet means between said front and back panel means in respective said recesses and being movable relative to said main cabinet means between at least partially extended and retracted positions without disturbing said front panel means, said speaker units when in said retracted position being substantially concealed by said front panel means with said outer ends of said speaker units closing said end openings, and said two speaker units being connected tO said sound reproduction channel means, and, movable speaker unit support means connected between said main cabinet means and said speaker units, said support means being adapted to permit at least partial extension and retraction of said speaker units as aforesaid with respect to said main cabinet means whereby to permit movement of said speaker units out of and into respective recesses in said main cabinet means, without disturbing said front panel means.
Claim 2
Dependent Claim
256 words
Stereo sound reproduction apparatus of the type having at least two speakers and sound reproduction channel means connected thereto, said apparatus comprising; main cabinet means having symmetrical front and back panel means of equal length, and two ends; speaker unit recesses formed within the interior of said main cabinet means at each end thereof between said front and back panel means; openings in said ends of said cabinet means giving access to said speaker unit recesses, said openings being concealed from the front of said main cabinet means by said front panel means; two speaker units having outer and inner ends shaped and dimensioned to fit within the interior of said main cabinet means between said front and back panel means in respective said recesses and being movable relative to said main cabinet means between at least partially extended and retracted positions without disturbing said front panel means, said speaker units when in said retracted position being substantially concealed by said front panel means with said outer ends of said speaker units closing said end openings, and said two speaker units being connected tO said sound reproduction channel means, and, movable speaker unit support means connected between said main cabinet means and said speaker units, said support means being adapted to permit at least partial extension and retraction of said speaker units as aforesaid with respect to said main cabinet means whereby to permit movement of said speaker units out of and into respective recesses in said main cabinet means, without disturbing said front panel means.
Claim 3
Dependent Claim
30 words
Stereo sound reproduction apparatus as claimed in claim 1 including motion transmission means connected to respective said speaker units and power operated drive means for driving said motion transmission means.
Claim 4
Dependent Claim
28 words
Stereo sound reproduction apparatus as claimed in claim 1 including movement limiting means associated with said support means, said limiting means controlling the extension of said speaker units.
Claim 5
Dependent Claim
49 words
Stereo sound reproduction apparatus as claimed in claim 1 wherein said speaker units are dimensioned to fit snugly within said recesses, and said support means is offset relative to said units within said recesses thereby leaving same clear for substantially complete retraction of said speaker units into said recesses.
Claim 6
Dependent Claim
104 words
Stereo sound reproduction apparatus as claimed in claim 1 wherein said main cabinet means is of generally rectangular box-like construction having top and bottom wall means, and back and front wall means; and including inner wall means extending at least partially between said top and bottom walls spaced inwardly from said ends and defining said speaker unit recesses between said inner wall means and portions of said front and back wall means and said top and bottom wall means, and shelf means located in said main cabinet means between said inner wall means for supporting at least in part said sound reproduction means therein.
Claim 7
Dependent Claim
178 words
Stereo sound reproduction apparatus as claimed in claim 1 wherein said main cabinet is of generally rectangular box construction having top and bottom wall means, and a front and back wall means; partition means extending at least partially between said top and bottom wall means spaced between said front and back wall means and defining speaker recesses on one side thereof corresponding substantially in height and width to the dimensions of said speaker units; said openings in said ends of said main cabinet giving access to said speaker recesses and dimensioned to receive said speaker units therethrough, thereby permitting extension and retraction of said speaker units therethrough, thereby permitting extension and retraction of said speaker units with respect to said speaker unit recesses; intermediate wall members defining a spacing therebetween extending at least partially between said top and bottom walls lying in planes parallel to but spaced inwardly from said ends and forming inner walls of said recesses; and, shelf means located in said main cabinet means for supporting at least part of said sound reproduction means therein.
Claim 8
Dependent Claim
44 words
Stereo sound reproduction apparatus as claimed in claim 1 including end wall means on each said speaker unit shaped and dimensioned to close its respective said openings in respective said ends of said main cabinet when said speaker units are in their retracted position.
Claim 9
Dependent Claim
48 words
Stereo sound reproduction apparatus as claimed in claim 1 including hinge means mounted between a corner of each said speaker unit, and said main cabinet pivotally mounting said speaker units for pivotal movement about vertical axes relative to said main cabinet into and out of said speaker recesses.
Claim 10
Dependent Claim
39 words
Stereo sound reproduction apparatus as claimed in claim 1 including linkage means pivotally mounted on said speaker units, and electrical drive means operatively connected to said linkage means to swing said speaker units between said extended and retracted position.
Claim 11
Dependent Claim
28 words
Stereo sound reproduction apparatus as claimed in claim 1 wherein said speaker units are swingably mounted on said main cabinet for swingiNg into and out of said recess.
References Cited (Backward Citations)
US2547447A
Cited
US2565304A
Cited
US2677751A
Cited
GB871574A
Cited
US3090462A
Cited
US3533669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |