US2315896A - Radio speaker unit support - Google Patents
Radio speaker unit support Download PDFInfo
- Publication number
- US2315896A US2315896A US401251A US40125141A US2315896A US 2315896 A US2315896 A US 2315896A US 401251 A US401251 A US 401251A US 40125141 A US40125141 A US 40125141A US 2315896 A US2315896 A US 2315896A
- Authority
- US
- United States
- Prior art keywords
- board
- baille
- layer
- housing
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000002023 wood Substances 0.000 description 16
- 238000003475 lamination Methods 0.000 description 6
- 239000011358 absorbing material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 239000011490 mineral wool Substances 0.000 description 3
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 240000000491 Corchorus aestuans Species 0.000 description 1
- 235000011777 Corchorus aestuans Nutrition 0.000 description 1
- 235000010862 Corchorus capsularis Nutrition 0.000 description 1
- 241000698776 Duma Species 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
- H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
- H04R1/2876—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding
- H04R1/288—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself by means of damping material, e.g. as cladding for loudspeaker transducers
Definitions
- This invention relates to the class of yrecordingand reproducing, and pertains particularly to improvements in mountings for loud speakers.
- the principal object of the present invention is to provide an improved radio loud speaker mounting board or baille board by means of which battle board and cabinet resonance is reduced to a minimum.
- Another object of the invention is to provide an improved radio loud speaker support which is So designed that the air pressure upon the back of the loud speaker cone is maintained atall times at substantially the same pressure whereby there is obtained elimination of cabinet boom and hollowness or barrel effect which is so common to structures in which the reproducer unit is mounted in an ordinary wooden cabinet.
- Another object of the invention is to provide a support and housing for a loud speaker unit in which the unit is enclosed within a sound absorbing chamber and in which a wall ofthe chamber is provided with an opening over which the speaker cone of the unit is secured, the said wall being of novel construction to absorb vibration and thereby reduce resonance produced noises.
- Figure 1 shows a vertical longitudinal section through a loud speaker baille board support and housing constructed in accordance with the present invention
- Figure 2 is a fragmentary section on an enlarged scale through a portion of the center of the baffle board; and Figure 3 is a fragmentary section taken on the line 3 3 of Figure 1, and on an enlarged scale.
- the radio loud speaker unit is indicated generally by the reference character S.
- This unit includes the usual frame I of open form and conical design, having at the larger end thereof the annular mounting ange II.
- the speaker unit S is enclosed within a sound absorbing box or housing H.
- This housing comprises a front wall or baille board H1 upon which the speaker unit is mounted as hereinafter de- Cil scribed, a back wall H2 and top, bottom and side walls designated respectively H3, H4 and H5.
- the front wall of the housing or baille board is made up in laminated form and has outer layers of veneer wood I2.
- the inner face of each of these veneer wood layers has placed thereagainst a sheet or layer I3 of heavy felt paper and interposed between the felt paper sheet or layer is a sheet I4 of lead preferably of 16 gauge or heavier thickness.
- the several laminations making up the baille board H1 are secured together by bolts I5 which, as clearly shown in ⁇ Figure 2, do not extend entirely through the board but ⁇ secure the inner and outer veneer wood layers and felt paper to the central lead sheet. In other words, some of the bolts pass through the lead sheet inwardly through the inner paper layer and inner veneer wood board while others pass through the lead sheet ⁇ and outwardly through the outer paper layer and outer veneer wood board.
- the opening I and the annular frame portion I lof the speaker is secured to the inner side of the baffle board concentric with this opening.
- the inner side of the baffle board is also covered with a relatively thick layer of rock wool or other suitable sound absorbing materal such as jute and the like.
- This layer of sound absorbing material which overlies the inner side of the lbaiile board is indicated by the numeral I1.
- top, bottom, side and back walls of the housing are also of laminated construction and are made up of an outer section or layer of wood veneer I8, the inner face of which is covered with a sheet of heavy felt paper I9.
- a sheet of heavy felt paper I9 Overlying each sheet of paper I9 and thus covering each of the top, bottom, back and side walls is a sheet of lead 20 of the same weight as the lead sheet I4 which is used in the baille wall.
- Each of these walls is also covered with the relatively thick layer or bat of rock wool or other suitable sound absorbing material, these layers being indicated by the numeral 2'I.
- a rubber shock absorbing band or strip 22 which may be secured in any suitable manner to the edge of the baffle wall and it is also secured to the adjacent edges of the top, t
- the face of the baille wall is also outlined by the rubber gasket 23 which engages the inner side wall of the cabinet, not shown, in which the present speaker housing structure may be mounted.
- the tone quality of the speaker is very greatly improved over speakers mounted in the customary manner directly to a radio cabinet wall and not having an enclosing sound absorbing casing or housing.
- the speaker efciency is greatly improved and the power handling ability is greatly increased.
- the dimensions of the sheet or walls .of wood veneer and of the other materials may be varied as desired, it is preferred that the veneer be of approximately one-quarter inchthickness and that the inner wall layers of rock wool be approximately two inches thick.
- a radio loud speaker support comprising a baille board of laminated constructionand having Aat least three laminations, the board having a central lamination of exchange metal, said vboard having an opening over which a loud speaker cone is positioned, and a sound absorbing housing connected with one side .of the baille board and enclosing the speaker unitl 2.
- a radio loud speaker unit support comprising a housing having one wall provided with an opening .and constituting a baille board, said opening being designed to have a speaker unit secured thereover upon the inner side of the board, said baille board being of laminated constructionand having at least three laminations and including a central lamination of sheet lead,
- a radio loud speaker unit support comprising a housing, one wall of said housing constituting a baille board and having an opening over which a speaker unit may be secured, said baille board comprising a central layer of sheet lead and inner and outer layers of wood, securing members connecting said lead layer with the outer wood layer, each of said'securing members extending only from and through the lead layer toward and through one wood layer, and a rela tively thick layer of brous sound absorbing ma- Aterial.overlying'the inner surfaces of the housing.
- a radio loud speaker unit support comprising a housing, one wall of which constitutes a baille board having a central opening over which the unit is secured, said baille wall being of laminated construction and including a central layer of sheet lead and inner and outer layers oi wood, securing elements extending from said lead ⁇ layer inwardly to andfconnected with the inner wood layer, securing elements extending from lthe Ylead layer outwardly to andsecured to the outer wood layer, .the housing having top, bottom, sideV and back walls, .a sheet of lead covering each of said last mentioned walls, and a relatively thick vlayer of fibrous ysound absorbing material covering the inner wall surfaces of the housing.
- a 'radio Aloud speaker unit support as set forth in claim-4 -in whichsaidtop, bottom, side and back walls are exteriorly formed of wood veneer, and -a-covering over the inner faces of said last -mentioned wallsrof felt-paper which is interposed between the .wood veneer and the lead sheet.
- Ara'dio vloud speakerunit support comprising a laminated board havinga central opening over which the unit .-is secured, said boardcomprisingiav central lamination of sheet lead, a layer of felt paper disposed over eachface' of the lead sheet; and a' relatlve'lytliin Woo'd sheet covering eachgpap'erlayer, and aplurality of 'securing elements, certainof which arel connected with and extendrfromfth'el'eadsheet in one'dlrection therefrom 'to the 'adjacent wood layer andthe 'others of ⁇ which' extend fromand are connectedwith 4the lead islreet to and-have connection 'with' the other wood-layer.
Description
April.6, 1943. E. o. DUMAS n y RADIO SPEAKER UNIT SUPPORT gmc/Wto@ Patented Apr. 6, 1943 UNITED STATES PATIENT OFFICE RADIO SPEAKER UNITASUPPORT' Ellsworth 0. Dumas, Scottville, Mich.
Application July 5, 1941, Serial No. 401,251
6 Claims.
This invention relates to the class of yrecordingand reproducing, and pertains particularly to improvements in mountings for loud speakers.
The principal object of the present invention is to provide an improved radio loud speaker mounting board or baille board by means of which baiile board and cabinet resonance is reduced to a minimum.
Another object of the invention is to provide an improved radio loud speaker support which is So designed that the air pressure upon the back of the loud speaker cone is maintained atall times at substantially the same pressure whereby there is obtained elimination of cabinet boom and hollowness or barrel effect which is so common to structures in which the reproducer unit is mounted in an ordinary wooden cabinet.
Another object of the invention is to provide a support and housing for a loud speaker unit in which the unit is enclosed within a sound absorbing chamber and in which a wall ofthe chamber is provided with an opening over which the speaker cone of the unit is secured, the said wall being of novel construction to absorb vibration and thereby reduce resonance produced noises.
The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying drawing, it being understood, however, that the invention is not to be considered as limitedby the specific illustration or description but that such illustration and description constitutes a. preferred embodiment of the invention.
In the drawing:
Figure 1 shows a vertical longitudinal section through a loud speaker baille board support and housing constructed in accordance with the present invention;
Figure 2 is a fragmentary section on an enlarged scale through a portion of the center of the baffle board; and Figure 3 is a fragmentary section taken on the line 3 3 of Figure 1, and on an enlarged scale.
Referring now more particularly to the drawing, the radio loud speaker unit is indicated generally by the reference character S. This unit includes the usual frame I of open form and conical design, having at the larger end thereof the annular mounting ange II.
In accordance with the present invention the speaker unit S is enclosed within a sound absorbing box or housing H. This housing comprises a front wall or baille board H1 upon which the speaker unit is mounted as hereinafter de- Cil scribed, a back wall H2 and top, bottom and side walls designated respectively H3, H4 and H5.
f The front wall of the housing or baille board is made up in laminated form and has outer layers of veneer wood I2. The inner face of each of these veneer wood layers has placed thereagainst a sheet or layer I3 of heavy felt paper and interposed between the felt paper sheet or layer is a sheet I4 of lead preferably of 16 gauge or heavier thickness.
The several laminations making up the baille board H1 are secured together by bolts I5 which, as clearly shown in` Figure 2, do not extend entirely through the board but `secure the inner and outer veneer wood layers and felt paper to the central lead sheet. In other words, some of the bolts pass through the lead sheet inwardly through the inner paper layer and inner veneer wood board while others pass through the lead sheet `and outwardly through the outer paper layer and outer veneer wood board.
At the center of the baffle board there is formed the opening I and the annular frame portion I lof the speaker is secured to the inner side of the baffle board concentric with this opening.
The inner side of the baffle board is also covered with a relatively thick layer of rock wool or other suitable sound absorbing materal such as jute and the like. This layer of sound absorbing material which overlies the inner side of the lbaiile board is indicated by the numeral I1.
vThe top, bottom, side and back walls of the housing are also of laminated construction and are made up of an outer section or layer of wood veneer I8, the inner face of which is covered with a sheet of heavy felt paper I9. Overlying each sheet of paper I9 and thus covering each of the top, bottom, back and side walls is a sheet of lead 20 of the same weight as the lead sheet I4 which is used in the baille wall. Each of these walls is also covered with the relatively thick layer or bat of rock wool or other suitable sound absorbing material, these layers being indicated by the numeral 2'I.
Extending around the edge or periphery of the baiiie wall is a rubber shock absorbing band or strip 22 which may be secured in any suitable manner to the edge of the baffle wall and it is also secured to the adjacent edges of the top, t
bottom and side walls so that the baffle wall is integrally connected in the housing structure. The face of the baille wall is also outlined by the rubber gasket 23 which engages the inner side wall of the cabinet, not shown, in which the present speaker housing structure may be mounted.
With the present speaker housing structure the tone quality of the speaker is very greatly improved over speakers mounted in the customary manner directly to a radio cabinet wall and not having an enclosing sound absorbing casing or housing. The speaker efciency is greatly improved and the power handling ability is greatly increased.
By arranging the securing bolts in the baille wall structure in the manner shown and described there is obtained a neutralizing effect on any motion set up by the movement of the speaker cone and, therefore, there is obtained a complete elimination of baille resonance.
While the dimensions of the sheet or walls .of wood veneer and of the other materials may be varied as desired, it is preferred that the veneer be of approximately one-quarter inchthickness and that the inner wall layers of rock wool be approximately two inches thick.
By the provision of the rubber strips around the baille board, there is provided for the baille boarda floating connection with the rest of the speaker unit enclosing structure.
With this radio speakerunit support or nonresonant speaker baille the air pressure or loading of the 'speaker is kept directly on the front of the speaker cone instead of the cabinet or baille, since any motion of the speaker baille or cabinet sets up air movements that are not in accord with the movements of the yspeaker cone, and these extraneous cabinet or baille Inovements or vibrations cause serious distortion in the original reproduced speech or music. The
present type of baille eliminates this source of distortion almost entirely.
I claim:
l. A radio loud speaker support comprising a baille board of laminated constructionand having Aat least three laminations, the board having a central lamination of soit metal, said vboard having an opening over which a loud speaker cone is positioned, and a sound absorbing housing connected with one side .of the baille board and enclosing the speaker unitl 2. A radio loud speaker unit support .comprising a housing having one wall provided with an opening .and constituting a baille board, said opening being designed to have a speaker unit secured thereover upon the inner side of the board, said baille board being of laminated constructionand having at least three laminations and including a central lamination of sheet lead,
and a relatively thick layer of a fibrous sound absorbing material overlying the interior surface of the housing.
3. A radio loud speaker unit support comprising a housing, one wall of said housing constituting a baille board and having an opening over which a speaker unit may be secured, said baille board comprising a central layer of sheet lead and inner and outer layers of wood, securing members connecting said lead layer with the outer wood layer, each of said'securing members extending only from and through the lead layer toward and through one wood layer, and a rela tively thick layer of brous sound absorbing ma- Aterial.overlying'the inner surfaces of the housing.
4. A radio loud speaker unit support comprising a housing, one wall of which constitutes a baille board having a central opening over which the unit is secured, said baille wall being of laminated construction and including a central layer of sheet lead and inner and outer layers oi wood, securing elements extending from said lead` layer inwardly to andfconnected with the inner wood layer, securing elements extending from lthe Ylead layer outwardly to andsecured to the outer wood layer, .the housing having top, bottom, sideV and back walls, .a sheet of lead covering each of said last mentioned walls, and a relatively thick vlayer of fibrous ysound absorbing material covering the inner wall surfaces of the housing.
5. A 'radio Aloud speaker unit support as set forth in claim-4 -in whichsaidtop, bottom, side and back walls are exteriorly formed of wood veneer, and -a-covering over the inner faces of said last -mentioned wallsrof felt-paper which is interposed between the .wood veneer and the lead sheet.
`6. Ara'dio vloud speakerunit support comprising a laminated board havinga central opening over which the unit .-is secured, said boardcomprisingiav central lamination of sheet lead, a layer of felt paper disposed over eachface' of the lead sheet; and a' relatlve'lytliin Woo'd sheet covering eachgpap'erlayer, and aplurality of 'securing elements, certainof which arel connected with and extendrfromfth'el'eadsheet in one'dlrection therefrom 'to the 'adjacent wood layer andthe 'others of `which' extend fromand are connectedwith 4the lead islreet to and-have connection 'with' the other wood-layer.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US401251A US2315896A (en) | 1941-07-05 | 1941-07-05 | Radio speaker unit support |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US401251A US2315896A (en) | 1941-07-05 | 1941-07-05 | Radio speaker unit support |
Publications (1)
Publication Number | Publication Date |
---|---|
US2315896A true US2315896A (en) | 1943-04-06 |
Family
ID=23586990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US401251A Expired - Lifetime US2315896A (en) | 1941-07-05 | 1941-07-05 | Radio speaker unit support |
Country Status (1)
Country | Link |
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US (1) | US2315896A (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2475782A (en) * | 1942-12-03 | 1949-07-12 | Automatic Elect Lab | Cellular support for loudspeakers, including acoustic chambers |
US2552309A (en) * | 1947-10-10 | 1951-05-08 | Rca Corp | Acoustic diaphragm and baffle |
US2839150A (en) * | 1954-02-02 | 1958-06-17 | Perlman Robert Ruben | Loud speaker having means for utilizing the back wave |
US2840181A (en) * | 1956-08-07 | 1958-06-24 | Benjamin H Wildman | Loudspeaker cabinet |
US2852087A (en) * | 1955-02-15 | 1958-09-16 | Dolph W Ruschhaupt | Sound reproducing devices |
US3072212A (en) * | 1961-01-23 | 1963-01-08 | Chapman Robert York | Acoustic resonant cabinet |
US3115947A (en) * | 1962-02-23 | 1963-12-31 | Warren R Wood | High fidelity sound reproducer |
US3712411A (en) * | 1972-03-17 | 1973-01-23 | D Monroe | Loud speaker cabinet |
US3757890A (en) * | 1972-02-14 | 1973-09-11 | W Dunning | Electromagnetic suspended speaker |
US4167985A (en) * | 1976-05-13 | 1979-09-18 | Dunlavy John H | Speaker system |
US4624338A (en) * | 1985-02-01 | 1986-11-25 | Electro-Voice, Incorporated | Loudspeaker enclosure for a vibrating diaphragm loudspeaker |
US5115884A (en) * | 1989-10-04 | 1992-05-26 | James Falco | Low distortion audio speaker cabinet |
US5194701A (en) * | 1991-09-11 | 1993-03-16 | N.P.L. Ltd. | Speaker structure |
USD775107S1 (en) * | 2015-10-09 | 2016-12-27 | Bose Corporation | Low profile speaker |
-
1941
- 1941-07-05 US US401251A patent/US2315896A/en not_active Expired - Lifetime
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2475782A (en) * | 1942-12-03 | 1949-07-12 | Automatic Elect Lab | Cellular support for loudspeakers, including acoustic chambers |
US2552309A (en) * | 1947-10-10 | 1951-05-08 | Rca Corp | Acoustic diaphragm and baffle |
US2839150A (en) * | 1954-02-02 | 1958-06-17 | Perlman Robert Ruben | Loud speaker having means for utilizing the back wave |
US2852087A (en) * | 1955-02-15 | 1958-09-16 | Dolph W Ruschhaupt | Sound reproducing devices |
US2840181A (en) * | 1956-08-07 | 1958-06-24 | Benjamin H Wildman | Loudspeaker cabinet |
US3072212A (en) * | 1961-01-23 | 1963-01-08 | Chapman Robert York | Acoustic resonant cabinet |
US3115947A (en) * | 1962-02-23 | 1963-12-31 | Warren R Wood | High fidelity sound reproducer |
US3757890A (en) * | 1972-02-14 | 1973-09-11 | W Dunning | Electromagnetic suspended speaker |
US3712411A (en) * | 1972-03-17 | 1973-01-23 | D Monroe | Loud speaker cabinet |
US4167985A (en) * | 1976-05-13 | 1979-09-18 | Dunlavy John H | Speaker system |
US4624338A (en) * | 1985-02-01 | 1986-11-25 | Electro-Voice, Incorporated | Loudspeaker enclosure for a vibrating diaphragm loudspeaker |
US5115884A (en) * | 1989-10-04 | 1992-05-26 | James Falco | Low distortion audio speaker cabinet |
US5194701A (en) * | 1991-09-11 | 1993-03-16 | N.P.L. Ltd. | Speaker structure |
USD775107S1 (en) * | 2015-10-09 | 2016-12-27 | Bose Corporation | Low profile speaker |
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