US3757890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic suspended speaker
Assignee: Individual
•
Filing: 1972-02-14
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Granted: 1973-09-11
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Expires: 1992-02-14
Abstract
Abstract In a preferred embodiment, an electromagnetic audio speaker device including an electromagnetic vibrator connected functionally to a speaker cone, the vibrator and cone being suspended within an inner enclosure having a first speaker opening circumscribing a membrane means attached at the first inner opening periphery and attached to an outer periphery of the cone, the inner enclosure being encased within and spaced from an outer enclosure having a second speaker opening aligned with the first speaker opening, the inner and outer enclosures at their opening peripheries being joined to the outer periphery of the membrane means, the membrane means being an elastomer foam encased between two taut polyethylene membranes, the enclosures each being of plastic sheet material laminated to fiber-board sheet material.
Inventors
- 👤 W Dunning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:47
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/283; H04R1/2834; H04R1/2869; H04R1/2884; H04R1/2888; H04R7/00; H04R7/02; H04R7/04
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
157 words
A loudspeaker assembly comprising in combination an electromagnetic loudspeaker including an electromagnet and a conical vibratory cone operatively connected to each other, the cone outer periphery abutting a membranous diaphragm means having inner and outer peripheral edges with the abutting being at about the peripheral inner edge, the membranous diaphragm means having an opening therein defined by said inner peripheral edge, a first enclosure structure enclosing said electromagnet and cone and including a speaker-mounting opening defined by first enclosure structure peripherally around said opening, said membranous diaphragm means outer edge being attached to and supported by said first enclosure speaker-opening-defining structure with said diaphragm means mounted in a substantially taut state, the diaphragm means comprising a plurality of supportive membranous sheets each having front and back faces, the sheets being mounted in substantially parallel planes with one another, and an intermediate media sealed between and in contact with each of opposing ones of faces of said plurality.
Claim 2
Dependent Claim
157 words
A loudspeaker assembly comprising in combination an electromagnetic loudspeaker including an electromagnet and a conical vibratory cone operatively connected to each other, the cone outer periphery abutting a membranous diaphragm means having inner and outer peripheral edges with the abutting being at about the peripheral inner edge, the membranous diaphragm means having an opening therein defined by said inner peripheral edge, a first enclosure structure enclosing said electromagnet and cone and including a speaker-mounting opening defined by first enclosure structure peripherally around said opening, said membranous diaphragm means outer edge being attached to and supported by said first enclosure speaker-opening-defining structure with said diaphragm means mounted in a substantially taut state, the diaphragm means comprising a plurality of supportive membranous sheets each having front and back faces, the sheets being mounted in substantially parallel planes with one another, and an intermediate media sealed between and in contact with each of opposing ones of faces of said plurality.
Claim 3
Dependent Claim
15 words
A loudspeaker assembly of claim 1, in which said intermediate media comprises an elastomeric composition.
Claim 4
Dependent Claim
15 words
A loudspeaker assembly of claim 2, in which said elastomeric composition comprises substantially polyurethane foam.
Claim 5
Dependent Claim
31 words
A loudspeaker assembly of claim 3, in which said enclosure structure comprises laminated plastic sheet and cellulosic fiber-board sheet, and sound-absorbing insulation mounted within said enclosure and spaced from said cone.
Claim 6
Dependent Claim
19 words
A loudspeaker assembly of claim 1, in which said plurality comprises two opposing membranes separated by said intermediate media.
Claim 7
Dependent Claim
16 words
A loudspeaker assembly of claim 5, in which said opposing membranes are each flexible polyester membranes.
Claim 8
Dependent Claim
113 words
A loudspeaker assembly of claim 1, including a second enclosure having open-end structure defining a second opening arranged in alignment with said first speaker structure opening, said open-end structure of said second enclosure structure joining said peripheral outer edge and said second enclosure structure being mounted on and within the enclosing structure thereof spaced from the first enclosing structure at substantially all points such that an intermediate space is defined between the first enclosure structure and the second enclosure structure, in which said electromagnetic loudspeaker includes an apertured frame in supporting relationship with said electromagnet with the frame mounted on said diaphragm means inner periphery, and in which said cone is substantially conical.
Claim 9
Dependent Claim
104 words
A loudspeaker assembly of claim 1, including a second enclosure having open-end structure defining a second opening arranged in alignment with said first speaker structure opening, said open-end structure of said second enclosure structure joining said peripheral outer edge and said second enclosure structure being mounted on and within the enclosing structure thereof spaced from the first enclosing structure at substantially points such that an intermediate space is defined between the first enclosure structure and the second enclosure structure, in which said electromagnetic loudspeaker includes an apertured frame in supporting relationship with said electromagnet with the frame mounted on said diaphragm means inner periphery.
Claim 10
Dependent Claim
121 words
A loudspeaker cabinet comprising in combination a laminated enclosure structure defining an opening receivable of and mountable therein of an electromagnetic speaker cone and electromagnet means within an enclosure space defined by the enclosure structure, said laminated enclosure structure including an outer layer of a first sheet structure of first predetermined resonance properties having an inner face, a second layer of a second different sheet structure laminated to said inner face, said second sheet structure having an inner face and having second predetermined resonance properties different from said first sheet structure, a third different and substantially sound-absorbing sheet structure mounted about adjacent an inner side of and extending substantially spaced from said second sheet''s inner face and defining said enclosure space.
Claim 11
Dependent Claim
121 words
A loudspeaker cabinet comprising in combination a laminated enclosure structure defining an opening receivable of and mountable therein of an electromagnetic speaker cone and electromagnet means within an enclosure space defined by the enclosure structure, said laminated enclosure structure including an outer layer of a first sheet structure of first predetermined resonance properties having an inner face, a second layer of a second different sheet structure laminated to said inner face, said second sheet structure having an inner face and having second predetermined resonance properties different from said first sheet structure, a third different and substantially sound-absorbing sheet structure mounted about adjacent an inner side of and extending substantially spaced from said second sheet''s inner face and defining said enclosure space.
Claim 12
Dependent Claim
67 words
A loudspeaker cabinet of claim 9, in which said enclosing structure further includes a substantially sound-absorbing fourth sheet laminated on an outer face of said third sheet circumscribing said enclosure space and spaced from said second sheet structure and in the laminated state substantially enclosable of said cone and said electromagnetic means when mounted in said cabinet up to a periphery of said opening within said space.
Claim 13
Dependent Claim
54 words
The loudspeaker cabinet of claim 10, and further including a fifth sheet structure about the same as said fourth sheet structure, spaced from said second sheet structure and with said third sheet structure located between and attached flushly to said fifth sheet structure and said fourth sheet structure in a face to face relationship.
Claim 14
Dependent Claim
50 words
The loudspeaker cabinet of claim 11, in which said first sheet structure comprises polyester plastic sheet, in which said second sheet structure comprises substantially hard cellulosic fiberboard sheet, in which said fourth and fifth sheet structures each comprise soft cellulosic fiberboard sheet, and in which said third structure comprises fiberglass.
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) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |