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US3978941A Expired / Lapsed US ⏱️ 0.0 years remaining

Speaker enclosure

Assignee: Individual
•
Filing: 1975-06-06
•
Granted: 1976-09-07
•
Expires: 1995-06-06
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Abstract

Abstract An improved speaker enclosure for providing an acoustical balanced output with improved audio quality at low level reproduction. The enclosure includes a low sonic frequency pressure induced sonic wave amplification resulting from in phase reflection mechanically of re-induced resonant pressure waves. The invention comprises a speaker chamber of improved construction, the speaker being placed across one end, with the opposite end of the chamber being closed by an elastic diaphragm having an acoustic non-resonant tube centrally disposed protruding into the chamber, allowing the flow of air from inside the chamber enclosure to the outside atmosphere. The elastic diaphragm which is mounted at the chamber end opposite from the speaker mounting provides for mechanical reflection of low frequency acoustical waves, the dimensions of the speaker enclosure and the resonant tube being sized to produce an additive effect on low frequency acoustic waves which increases the dynamic amplitude of the low frequency response of the device. The non-resonant tube is disposed on the center axis of the chamber and is sized to allow a certain amount of air emission from the chamber itself.

Inventors

  • 👤 Curt August Siebert

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 06:15
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/28; H04R1/2807; H04R1/283; H04R1/2834; H04R1/2815; H04R1/2819

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 89 words
An improved speaker enclosure comprising: a tubular shaped enclosure body, insulating means disposed within said enclosure, conventional speaker coupled across and adjacent one end of said enclosure body; a flexible diaphragm said diaphragm being flexibly, dynamically responsive to acoustical wave energy of a predetermined frequency and being disposed opposite said speaker enclosing said outer tubular body at one end, said diaphragm having an aperture disposed therethrough; and an elongated venting tube connected across said diaphragm aperture and disposed axially in the direction of said speaker within said enclosure chamber.
Claim 2
Dependent Claim 89 words
An improved speaker enclosure comprising: a tubular shaped enclosure body, insulating means disposed within said enclosure, conventional speaker coupled across and adjacent one end of said enclosure body; a flexible diaphragm said diaphragm being flexibly, dynamically responsive to acoustical wave energy of a predetermined frequency and being disposed opposite said speaker enclosing said outer tubular body at one end, said diaphragm having an aperture disposed therethrough; and an elongated venting tube connected across said diaphragm aperture and disposed axially in the direction of said speaker within said enclosure chamber.
Claim 3
Dependent Claim 124 words
An improved sonic speaker housing comprising: an elongated tubular enclosure having first and second open ends: high frequency sonic energy insulating means disposed about the interior of said enclosure covering the interior walls of the enclosure completely; a means coupled near said first open end of said enclosure for mounting an audio speaker across the first open end; a flexible, acoustical energy responsive diaphragm elastically coupled to the second open end, covering said second open end of said enclosure, said diaphragm having a center aperture disposed therethrough, said diaphragm having a predetermined resonant vibrational acoustical characteristic frequency; an elongated tube connected inside the said flexible diaphragm across said diaphragm aperture, said tube having a longitudinal axis disposed along the longitudinal axis of said enclosure.
Claim 4
Dependent Claim 124 words
An improved sonic speaker housing comprising: an elongated tubular enclosure having first and second open ends: high frequency sonic energy insulating means disposed about the interior of said enclosure covering the interior walls of the enclosure completely; a means coupled near said first open end of said enclosure for mounting an audio speaker across the first open end; a flexible, acoustical energy responsive diaphragm elastically coupled to the second open end, covering said second open end of said enclosure, said diaphragm having a center aperture disposed therethrough, said diaphragm having a predetermined resonant vibrational acoustical characteristic frequency; an elongated tube connected inside the said flexible diaphragm across said diaphragm aperture, said tube having a longitudinal axis disposed along the longitudinal axis of said enclosure.
Claim 5
Dependent Claim 18 words
An audio speaker enclosure, as in claim 2, wherein: said flexible diaphragm consists of 28 gage galvanized metal.
Claim 6
Dependent Claim 18 words
An improved speaker enclosure, as in claim 2, wherein: said flexible diaphragm consists of 16 gage stainless steel.
Claim 7
Dependent Claim 23 words
An improved speaker enclosure as in claim 2, wherein: said elongated tube length is substantially four times longer than said diaphragm aperture diameter.

References Cited (Backward Citations)

US1869178A Cited
US2713396A Cited
US3037081A Cited
US2834423A Cited
GB1032774A Cited
US3371742A Cited
US3727719A Cited
US3667568A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1979-09-07 1980-03-08 1980-09-07 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1983-09-07 1984-03-08 1984-09-07 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1987-09-07 1988-03-08 1988-09-07 $7700.00 Window Closed / Lapsed

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