US2001916A - Sound absorbing material - Google Patents
Sound absorbing material Download PDFInfo
- Publication number
- US2001916A US2001916A US380328A US38032829A US2001916A US 2001916 A US2001916 A US 2001916A US 380328 A US380328 A US 380328A US 38032829 A US38032829 A US 38032829A US 2001916 A US2001916 A US 2001916A
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- US
- United States
- Prior art keywords
- sound
- cells
- absorbing
- rubber
- absorbing material
- 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
- 239000011358 absorbing material Substances 0.000 title description 3
- 239000000463 material Substances 0.000 description 19
- 210000004027 cell Anatomy 0.000 description 14
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 6
- 239000011295 pitch Substances 0.000 description 6
- 230000001413 cellular effect Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 239000007789 gas Substances 0.000 description 4
- 239000011148 porous material Substances 0.000 description 4
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000008103 glucose Substances 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 235000011187 glycerol Nutrition 0.000 description 3
- 235000013311 vegetables Nutrition 0.000 description 3
- 238000004073 vulcanization Methods 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 2
- 210000003850 cellular structure Anatomy 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 210000004209 hair Anatomy 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000005864 Sulphur Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B25/00—Layered products comprising a layer of natural or synthetic rubber
- B32B25/12—Layered products comprising a layer of natural or synthetic rubber comprising natural rubber
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- C—CHEMISTRY; METALLURGY
- C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
- C10L—FUELS NOT OTHERWISE PROVIDED FOR; NATURAL GAS; SYNTHETIC NATURAL GAS OBTAINED BY PROCESSES NOT COVERED BY SUBCLASSES C10G, C10K; LIQUEFIED PETROLEUM GAS; ADDING MATERIALS TO FUELS OR FIRES TO REDUCE SMOKE OR UNDESIRABLE DEPOSITS OR TO FACILITATE SOOT REMOVAL; FIRELIGHTERS
- C10L1/00—Liquid carbonaceous fuels
- C10L1/04—Liquid carbonaceous fuels essentially based on blends of hydrocarbons
- C10L1/06—Liquid carbonaceous fuels essentially based on blends of hydrocarbons for spark ignition
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/82—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to sound only
- E04B1/84—Sound-absorbing elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/001—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation characterised by provisions for heat or sound insulation
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B9/00—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation
- E04B9/04—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like
- E04B9/045—Ceilings; Construction of ceilings, e.g. false ceilings; Ceiling construction with regard to insulation comprising slabs, panels, sheets or the like being laminated
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/0215—Bearing, supporting or connecting constructions specially adapted for such buildings involving active or passive dynamic mass damping systems
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
- Y10S264/63—Processes of molding porous blocks
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24058—Structurally defined web or sheet [e.g., overall dimension, etc.] including grain, strips, or filamentary elements in respective layers or components in angular relation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/249921—Web or sheet containing structurally defined element or component
- Y10T428/249953—Composite having voids in a component [e.g., porous, cellular, etc.]
- Y10T428/249981—Plural void-containing components
Definitions
- My invention relates to sound-absorbing material and a method of making the same, and more particularly to materials such as are emceilings of auditoriums,
- One object of my invention is to providey soundabsorbing material which is highly elastic and flexible, so that it will yield under slight impacts such as those or" sound waves, and which can be handled Without damage and readily compressed K or expanded to snugly fill designated wall spaces.
- Another object of my invention is to provide a porous sound-absorbing body or unit having intercommunicating pores of desired sizes and wherein the walls of the pores are elastic.
- Still another object of my invention is to pro-v vide a sound-absorbing unit whose exposed surface may be given a decorative or protective facing.
- a further object of my invention is to provide a sound-absorbing body that is of generally improvedv characteristics in the way not only of sound-absorption, but which is simple of manufacture and conveniently handled and installed.
- Figure 1 represents a face view of a portion of a sound-absorbing unit constructed according to my invention
- Fig. 2 is a sectional view thereof
- Fig. 3 shows a modification of the structure of Fig. 2
- Fig. 4 shows still another modification thereof
- Fig. 5 is a view, on a greatly enlarged scale, showing more clearly the cellular structure of the units
- Figs. 6 and '7 are face and edge views, respectively, showing a further modicatii.
- MaterialI which I employ is of a sponge-like nature containing throughout the mass cells of desired sizes, depending upon the prevailing pitches o! sounds to be absorbed at a given loca- (Cl. 15d-4A) tion.
- sounds of comparatively low pitch such as those in the neighborhood ofthe first octave of the musical scale (64 vibrations per second)
- cells. of a given size will be effective in the absorption of those sounds, while in the neighborhood of the higheroctaves of the musical scale, the fifth, sixth and seventh.(1024, 2048 and 4096 vibrations per second, respectively), for example, cells of smaller size will be employed.
- composition of which my sound units may be formed consists of .an ordinary rubber compound containing sullcient sulphur to. effect vulcanizaton thereof in the usual manner.
- I incorporate materials which may form cells in the rubber either by dissolving away portions of the rubber or by forming gases therein which will expand under heat and about which the rubber will become set upon vulcanization of the mass.
- I may employ vegetable matter which contains moisture or which will form gases upon the application of heat below temperatures at which vulcanization' is effected.
- wet sawdust or charcoal particles may be incorporated with the rubber.
- The-size of the cells will be determined by the size of the gas-forming or steam-forming particles.
- sawdust and vegetable matter which is passed through a 20mesh screen will form larger cells than those., particles of sufficient lineness to pass through a mesh screen.
- I will monium carbonate, soda, etc., these substances forming gases when heated to comparatively low temperatures.
- the unit may have a smooth facing I of rubber, paint, or other plastic material.
- this facing could be either glued to the cellular body or vulcanized thereto. Again, .if the'body is vulcanized in a close-tting mold,y there will be a tendency for a skin to be formed on the surface of the article where the rubber contacts with the mold sides, thus producing a smooth exterior.
- Another mixture which may be employed instead of rubber may consist of glue,Y glycerine, and glucose, as a base, and containing gas-generating material such as soda or son'le .of the other materials above-enumerated.
- 'Ihis mixture may contain from 50 to '70 pounds of softened glue, 20 to 30 pounds of 'glycerine, and 15 to 25 pounds of glucose, fthe amount of gas-generating material. being of coursev dependent upon the extent of porosity desired in the completed
- the body is preparedby mixing l thev glue, glycerine and glucose at temperatures preferably not much in excess of 100 centigrade and then adding the soda. lThe mixture is stirred until la. foamy condition occurs, and may then be placed in molds and permitted to cool. When cooled it will be of a permanently elastic spongelike nature.
- a .body having the cellular end elastic eheracteristics of those above-described will, of course, absorb a considerable quantity of sound waves by reason .of its porous or cellular structure and by reason of its elasticity and the ilexibility of the mass as a whole, as well as of the walls of the cells, the sound waves being transformed into heat energy through the heating of the mass and the friction within the pores..
- Figs. 6 and '1 I show/a structurecomposed of crossed strands III and Il which may extend along substantially straight lines in various directions, or .may be heterogeneously assembled.
- These strands l0 and Il may be formed of rubber, in which case they can be vulcanized t0- gether at their points of intersection to form a homogeneous mass'.
- the vulcanization could be effected in a mold, with the application of heat, in a manner common in the rubber industry.
- the strands can also be formed of other material such as asbestos, in case a re proof body is desired and one which is not subject to decay.
- Theasbestos or other strands of thread-like or ribbon-lilieform may be glued or cemented together to maintain them in unitary relation.
- the fibers of Figsdand '7 are preferably manufactured in such forni end of such materials asto possess predeterminedrphysical characteristics and they may be of sucliL diameter and spaced Such distances apart as will-produce a body having pores of a desired size andy number.
- the material may be made up in the form of units ⁇ or slabsy of convenient size which ymay be applied to Walls, ceilings, or the like, by gluing,
- the material is compressible and 'if a piece is slightly too large for a given piece, it can be compressed therein. Again, it may be stretched somewhat in order to fill a larger space.
- the units being elastic can be placed in slightly-compressed abutting relation with one another, thus substantially eliminating marked visible lines of division which are usually present between sound-absorbing units of a more rigid nature.
- the elastic bodies will be largely cellular, that is, they will be composed almost entirely of cells divided' only by thin-walls, instead of being largely solid and containing cells spaced considerable distances apart.
Description
May 2l, 1935. J. MAzER y SOUND ABSORBING MATERIAL Filed July 25,
lNVENTOR ployed in the walls and 6 studios, etc., for definitely absorbing and Patented May 21., 1935 UNITI-:D STATES PATENT' omer.V
2,001,916y SOUND ABSOBBING MATERIAL Jacob Mazer, Stonehurst,1a. Applicationjuly 23, 1929, Serial No. 380k328 s claims.
My invention relates to sound-absorbing material and a method of making the same, and more particularly to materials such as are emceilings of auditoriums,
controlling reverberation of sound waves.
Various plans have' heretofore been adopted for controlling and absorbing sound waves, such as porous masonry materials, iibrous bodies, rigid cellular panels, etc.
These various materials have been open to objections such as the necessity of forming them at the place of installation, and in conjunction-with the walls or ceilings to be covered, as in the case of plastic or masonry materials; the fragile na.- ture of the fibrous bodies which are readily subject to damage through handling and which are subject to natural limitations by reason of the elasticity, size, etc., of various vegetable fibers, hair, etc., and the difficulty of applying preformed cellular units to spaces of various areas and contours.
One object of my invention is to providey soundabsorbing material which is highly elastic and flexible, so that it will yield under slight impacts such as those or" sound waves, and which can be handled Without damage and readily compressed K or expanded to snugly fill designated wall spaces. Another object of my invention is to provide a porous sound-absorbing body or unit having intercommunicating pores of desired sizes and wherein the walls of the pores are elastic.
Still another object of my invention is to pro-v vide a sound-absorbing unit whose exposed surface may be given a decorative or protective facing.
A further object of my invention is to provide a sound-absorbing body that is of generally improvedv characteristics in the way not only of sound-absorption, but which is simple of manufacture and conveniently handled and installed.
In the accompanying drawing, Figure 1 represents a face view of a portion of a sound-absorbing unit constructed according to my invention; Fig. 2 is a sectional view thereof; Fig. 3 shows a modification of the structure of Fig. 2; Fig. 4 shows still another modification thereof; Fig. 5 is a view, on a greatly enlarged scale, showing more clearly the cellular structure of the units, and Figs. 6 and '7 are face and edge views, respectively, showing a further modicatii.
MaterialI which I employ is of a sponge-like nature containing throughout the mass cells of desired sizes, depending upon the prevailing pitches o! sounds to be absorbed at a given loca- (Cl. 15d-4A) tion. Thus, for sounds of comparatively low pitch, such as those in the neighborhood ofthe first octave of the musical scale (64 vibrations per second), cells. of a given size will be effective in the absorption of those sounds, while in the neighborhood of the higheroctaves of the musical scale, the fifth, sixth and seventh.(1024, 2048 and 4096 vibrations per second, respectively), for example, cells of smaller size will be employed.
One composition of which my sound units may be formed consists of .an ordinary rubber compound containing sullcient sulphur to. effect vulcanizaton thereof in the usual manner. With this compound, I incorporate materials which may form cells in the rubber either by dissolving away portions of the rubber or by forming gases therein which will expand under heat and about which the rubber will become set upon vulcanization of the mass.
As one example of pore-forming ingredients,
I may employ vegetable matter which contains moisture or which will form gases upon the application of heat below temperatures at which vulcanization' is effected. For instance, wet sawdust or charcoal particles may be incorporated with the rubber. The-size of the cells will be determined by the size of the gas-forming or steam-forming particles. For example, sawdust and vegetable matter which is passed through a 20mesh screen will form larger cells than those., particles of sufficient lineness to pass through a mesh screen. In those cases wherein a generally inclusive sound-absorbing quality is desired, without special consideration of either the low pitch sounds or the high pitch sounds, I will monium carbonate, soda, etc., these substances forming gases when heated to comparatively low temperatures. When the mixture ,containing the gas-forming particles has been brought to a temperature at which the gases are produced, it is vulcanized, thus resulting in-a unit of sponge texture having the sound-absorbing and general physical characteristics aboveset forth, and may have the appearance of the structure shown in Figs. 1 and 2. Hydrocarbon substances, such as paraffin may also be employed.
Instead of producing a body having only-cells of a given size, or having cells of large andsmall be placed on a wall or ceiling with the smaller cells outermost, so that the sounds of higher pitch will be more readily absorbed by the body, while the sounds of lower pitch will be absorbed more completely within the portion 6 of the unit than would be possible by a unit containing only the small cells. f, g
Again. the unit may have a smooth facing I of rubber, paint, or other plastic material. In the case of a rubber facing, this facing could be either glued to the cellular body or vulcanized thereto. Again, .if the'body is vulcanized in a close-tting mold,y there will be a tendency for a skin to be formed on the surface of the article where the rubber contacts with the mold sides, thus producing a smooth exterior.
Another mixture which may be employed instead of rubber may consist of glue,Y glycerine, and glucose, as a base, and containing gas-generating material such as soda or son'le .of the other materials above-enumerated. 'Ihis mixture may contain from 50 to '70 pounds of softened glue, 20 to 30 pounds of 'glycerine, and 15 to 25 pounds of glucose, fthe amount of gas-generating material. being of coursev dependent upon the extent of porosity desired in the completed The body is preparedby mixing l thev glue, glycerine and glucose at temperatures preferably not much in excess of 100 centigrade and then adding the soda. lThe mixture is stirred until la. foamy condition occurs, and may then be placed in molds and permitted to cool. When cooled it will be of a permanently elastic spongelike nature.
A .body having the cellular end elastic eheracteristics of those above-described will, of course, absorb a considerable quantity of sound waves by reason .of its porous or cellular structure and by reason of its elasticity and the ilexibility of the mass as a whole, as well as of the walls of the cells, the sound waves being transformed into heat energy through the heating of the mass and the friction within the pores..
Other materials, such as felt which is made up v y of the fibers or hairs found in nature,r or on aniare very definitely limited because of theV -limitations of the raw material, as to size, length,
absorbing power, strength, durability, etc. 'I'hese have porosity, but the amount of porosity can be controlled only through a very limited extent; lt iseasily changedthrough handling and'pressure, and does not have the yielding quality of the material which I produce. Another very distinct feature and quality is thatv my material whileihighly porous, is a homogeneous mass of one piece, and not merely loosely associated ilbers or small particles.
In Figs. 6 and '1, I show/a structurecomposed of crossed strands III and Il which may extend along substantially straight lines in various directions, or .may be heterogeneously assembled.
These strands l0 and Il may be formed of rubber, in which case they can be vulcanized t0- gether at their points of intersection to form a homogeneous mass'. The vulcanization could be effected in a mold, with the application of heat, in a manner common in the rubber industry.
The strands can also be formed of other material such as asbestos, in case a re proof body is desired and one which is not subject to decay. Theasbestos or other strands of thread-like or ribbon-lilieform may be glued or cemented together to maintain them in unitary relation. The fibers of Figsdand '7 are preferably manufactured in such forni end of such materials asto possess predeterminedrphysical characteristics and they may be of sucliL diameter and spaced Such distances apart as will-produce a body having pores of a desired size andy number.
-The material may be made up in the form of units` or slabsy of convenient size which ymay be applied to Walls, ceilings, or the like, by gluing,
'nailing or the like, and its nexibiuty permits lt to be closely and accurately applied to curved surfaces, corners, etc., by unskilled workmen, with the assurance that the sound-absorbing capacity of the material when applied will be definitely known in advance, according tothe structure oi' the units. Again, the material is compressible and 'if a piece is slightly too large for a given piece, it can be compressed therein. Again, it may be stretched somewhat in order to fill a larger space.
when a unit ls stretched, te' e desired extent',
it can be either glued or fastened in such posi'- tion or, in the case of the porous rubber, it can be stretched by the workmen and held in such position until the heat generated by the stretching action has been dissipated, whereupon the unit will become set in an expanded position.
Also, the units being elastic can be placed in slightly-compressed abutting relation with one another, thus substantially eliminating marked visible lines of division which are usually present between sound-absorbing units of a more rigid nature.
Ordinarily, the elastic bodies will be largely cellular, that is, they will be composed almost entirely of cells divided' only by thin-walls, instead of being largely solid and containing cells spaced considerable distances apart.
I claim as my invention:-
1. A sound-absorbing body containing cells whose walls are flexible and highly elastic, and
of such thinness that they will vibrate under the influence of sound waves, the cells in one portion JACOB
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US380328A US2001916A (en) | 1929-07-23 | 1929-07-23 | Sound absorbing material |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US380328A US2001916A (en) | 1929-07-23 | 1929-07-23 | Sound absorbing material |
Publications (1)
Publication Number | Publication Date |
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US2001916A true US2001916A (en) | 1935-05-21 |
Family
ID=23500765
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US380328A Expired - Lifetime US2001916A (en) | 1929-07-23 | 1929-07-23 | Sound absorbing material |
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US (1) | US2001916A (en) |
Cited By (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2580076A (en) * | 1948-04-29 | 1951-12-25 | Sarah Lucas | Composition for making acousting material |
US3059564A (en) * | 1959-10-30 | 1962-10-23 | Robertson Co H H | Low noise air distributor |
US3124212A (en) * | 1964-03-10 | stephens | ||
US3126978A (en) * | 1964-03-31 | Acoustical and thermal insulation | ||
US3132714A (en) * | 1962-01-02 | 1964-05-12 | Aerojet General Co | Acoustic panel |
US3193437A (en) * | 1961-07-19 | 1965-07-06 | Freeman Chemical Corp | Laminated articles containing sheets of flexible foamed plastics and method for makin the same |
US3196975A (en) * | 1962-12-13 | 1965-07-27 | Allied Chem | Acoustic foam |
US3621934A (en) * | 1970-05-18 | 1971-11-23 | Goodrich Co B F | Acoustic wall coverings |
US5093394A (en) * | 1988-09-27 | 1992-03-03 | Sheller-Globe Corporation | Thermoformable acoustical mat composition and method |
US5444668A (en) * | 1979-04-30 | 1995-08-22 | The United States Of America As Represented By The Secretary Of The Navy | Anechoic and decoupling coating |
US6920723B2 (en) * | 2001-08-16 | 2005-07-26 | Dodge-Regupol, Incorporated | Impact sound insulation |
US20060111512A1 (en) * | 2004-11-24 | 2006-05-25 | Dunham John D | Energy-absorbent material and method of making |
US20090072457A1 (en) * | 2005-05-02 | 2009-03-19 | Downey Paul C | Vibration damper |
US8240430B2 (en) | 2002-10-01 | 2012-08-14 | Downey Paul C | Noise and vibration mitigating mat |
US9914011B2 (en) | 2015-06-25 | 2018-03-13 | Pliteq Inc. | Impact damping mat, equipment accessory and flooring system |
US10676920B2 (en) | 2015-06-25 | 2020-06-09 | Pliteq Inc | Impact damping mat, equipment accessory and flooring system |
-
1929
- 1929-07-23 US US380328A patent/US2001916A/en not_active Expired - Lifetime
Cited By (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3124212A (en) * | 1964-03-10 | stephens | ||
US3126978A (en) * | 1964-03-31 | Acoustical and thermal insulation | ||
US2580076A (en) * | 1948-04-29 | 1951-12-25 | Sarah Lucas | Composition for making acousting material |
US3059564A (en) * | 1959-10-30 | 1962-10-23 | Robertson Co H H | Low noise air distributor |
US3193437A (en) * | 1961-07-19 | 1965-07-06 | Freeman Chemical Corp | Laminated articles containing sheets of flexible foamed plastics and method for makin the same |
US3132714A (en) * | 1962-01-02 | 1964-05-12 | Aerojet General Co | Acoustic panel |
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