US1804884A - Acoustic slab - Google Patents

Acoustic slab Download PDF

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Publication number
US1804884A
US1804884A US392316A US39231629A US1804884A US 1804884 A US1804884 A US 1804884A US 392316 A US392316 A US 392316A US 39231629 A US39231629 A US 39231629A US 1804884 A US1804884 A US 1804884A
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Prior art keywords
slab
absorption
acoustic
indentations
depth
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Expired - Lifetime
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US392316A
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Mazer Marcus
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    • 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
    • E04B1/86—Sound-absorbing elements slab-shaped
    • 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
    • E04B2001/8457—Solid slabs or blocks
    • E04B2001/8476—Solid slabs or blocks with acoustical cavities, with or without acoustical filling
    • E04B2001/848—Solid slabs or blocks with acoustical cavities, with or without acoustical filling the cavities opening onto the face of the element

Definitions

  • the present invention relates to the art of acoustics, and has for an object to provide a building element of stone, stone composition or other suitable hard substance or composition providing a permanent depressed or indented surface structure incapable of being deformed, the depressions or indentations having a definite predetermined co-eflicient of absorption.
  • Another object of the present invention is to provide a slab or the like adaptable to any desired color or design, with an exposed surface in which are formed depressions or indentations to the desired number per square foot and which may be varied in size so as to give each square foot of the slab a predetermined acoustic value.
  • the purpose desired is to enable the manufacture of slabs 3" which may be of the same size but which may have greater or lesser absorbing value. Also,
  • the purpose is to enable the manufacture of these slabs where the indentations or depressions will present certain designs or configu- 7 rations.
  • Another object of the invention is to provide an acoustic surface which may be incorporated in a building unit of any configuration and adapted for incorporation in a wall or the like of practically any construction where units are employed, and wherein the units may be of any desired size so as to conform with regulation or standard require ments of slabs, blocks or the like.
  • Figure 1 is a perspective view of an acoustic slabconstructed according to the resent invention and showing a relatively arge number of indentations or depressions to the square foot to impart a certain predetermined acoustic value to the slab.
  • Figure 2 is a-vertical section taken through the same, showing the depressions in the'exposed surface of the slab.
  • Figure 3 is a perspective view of a modified form of the acoustic slab wherein a relatively large number of depressions or indentations are formed in the outer or exposed surface of the slab for imparting an acoustic value to the slab differing from that of the slab of Figure 1, and
  • Figure 4. is a fragmentary enlarged face view of one corner of the. slab, showing a modification in the shape of the depressions or indentations which are formed in the face thereof.
  • 10 designates the body portion of an acoustic slab which may be of suitable dimensions, and which preferably is about 1" in thickness.
  • the acoustic slab may be made of any suitable material; one form being a suitable mineral plastic material, precast and dried or baked with certain depressions or indentations 11 in its outer or exposed face 12 which have a definite predetermined coeflicient of absorption.
  • these depressions or indentations 11 may be of any desired number and depth within a given surface area, such as per square foot, and such depth and number of the openings 11 may be standardized so that the degree of absorption of these slabs may be known and they may be installed accordingly.
  • the openings 11 are of sufiicient depth only to provide the necessary air cushioning pockets, the depth being varied according to the diameter and number of openings 11 used to maintain a predetermined co-eflicient of absorption, and from Figure 4 it will be noted that the shape of the openings may be varied at will for the purpose of ornamentation or to otherwise produce different results.
  • Another feature of the openings 11 in the face 12 of the slab is that the openings, indentations or other surface depressions or interruptions of the slab may vary in shape, width, length, depth or diameter, according to the general configuration desired, in the same block or slab, or the opening 11 in each slab may be all of-the same diameter and depth.
  • the openings 11 may also be arranged as desired relatively to one another so as to produce various designs or configurations on the face 12 of the slab to properly absorb sound.
  • the body portion of the slab of adense and rigid material By having the body portion of the slab of adense and rigid material it has a very low and practically negligible sound absorbing quality and is rigid and permanent as to shape and density.
  • the provision of the indentations 11 in the face 12 of the slab 10 effects a mechanical means of absorption which is positive and permanent and which, when once ascertained with a certain number and size of indentations for a given surface area of slab, may be definitely used to various degrees for obtaining a desired co-efiicient of absorption.
  • the co-efiicient of absorption of each slab 10 is determined by the number, depth and diameter of the indentations or openings in the face 12 of the slab. By changing the number, depth and diameter of the indentations 11 in any given area, the co-eflicient of absorption is naturally changed.
  • This change in the co-efiicient of absorption may also be effected by changin the relative depth or diameter or shapes of the indentations without changing the number thereof.
  • any number of slabs may be constructed accordingly, and all of theseslabs will have the identical coefficient of absorption.
  • acoustic slab 13 has in its outer face 14 a rela- I .tively large number of openings or indentaard slabs may be manufactured and the same may be used as selected in a wall structure as necessity demands for establishing desired, and correcting any defects, in the acoustic properties of the building.
  • the openings 16 in the face of the sla l7 arerelatively lar e and are of polygonal form, and it is understood that the openings 16 may be of any desired shape or configuration for ornamental or other purposes.
  • this fire-proof, non-deformable, hard and unyielding slab is such that the depressions 11 cannot be altered as to size or shape by pressure on or against the slab, nor by rubbin over the surface of the slab; the slab there ore possessing a permanent predetermined and definite co-eflicient of absorption I
  • definite and permanent results are obtainable for desirable hearing conditions in a room.
  • the slabs 10, 13 and 17 may be of any suitable configuration at their inner or rear sides for securing the slabs to the inner sides of concrete walls or the like, and that in other respects the slabs may be of standard materials, shapes or construction.
  • An-acoustic slab comprising a dense, rigid body portion of fire-proof material having substantially a minimum inherent co-efficie'nt of scan absorption, said body portion having in its exposed face a predetermined number of indentations of a depth and size proportioned to the absorptive qualit desired, whereby to produce an acoustic sla having a permanent and fixed co-eflicient of absorption and which is unalterable in handling and use.
  • An acoustic slab comprisin a tile body portion presenting a sound re ecting outer face, and predetermined and permanent means for imparting a desired co-eflicient of absorption to the slab, said means consisting of a rigid and dense outer face portion on the tile body having indentations therein selected as to depth, diameter and number to impart the desired co-efiicient of absorption to the slab.

Description

May 12, 1931 M, MAZER I 1,804,884
ACOUSTIC SLAB Filed Sept. 13. 1929 Zmventor Jlhraw Jfazer,
Patented May 12, 1931 PATENT OFFICE MARCUS MAZER, OF PHILADELPHIA, PENNSYLVANIA ACOUSTIC SLAB Application filed September 13, 1929. Serial No. 382,318.
The present invention relates to the art of acoustics, and has for an object to provide a building element of stone, stone composition or other suitable hard substance or composition providing a permanent depressed or indented surface structure incapable of being deformed, the depressions or indentations having a definite predetermined co-eflicient of absorption.
It is well known that architects, builders and owners often require stone slabs as a veneer on the inside of their concrete walls. and since these stone slabs are very great reflectors of sound, it is an object of this 1 invention to provide a slab embodying the above characteristics which will enable the architects, buildersor owners to carry out their desires of stone slab construction and at the same time to secure perfect acoustic properties in their building.
Another object of the present invention is to provide a slab or the like adaptable to any desired color or design, with an exposed surface in which are formed depressions or indentations to the desired number per square foot and which may be varied in size so as to give each square foot of the slab a predetermined acoustic value. The purpose desired is to enable the manufacture of slabs 3" which may be of the same size but which may have greater or lesser absorbing value. Also,
, the purpose is to enable the manufacture of these slabs where the indentations or depressions will present certain designs or configu- 7 rations.
Another object of the invention is to provide an acoustic surface which may be incorporated in a building unit of any configuration and adapted for incorporation in a wall or the like of practically any construction where units are employed, and wherein the units may be of any desired size so as to conform with regulation or standard require ments of slabs, blocks or the like.
47 Various other objects and advantages of this invention will appear from the follow ing detailed description of the present shown embodiment, the same being illustrated in the accompanying drawings, wherein 5 Figure 1 is a perspective view of an acoustic slabconstructed according to the resent invention and showing a relatively arge number of indentations or depressions to the square foot to impart a certain predetermined acoustic value to the slab.
Figure 2 is a-vertical section taken through the same, showing the depressions in the'exposed surface of the slab.
Figure 3 is a perspective view of a modified form of the acoustic slab wherein a relatively large number of depressions or indentations are formed in the outer or exposed surface of the slab for imparting an acoustic value to the slab differing from that of the slab of Figure 1, and
Figure 4. is a fragmentary enlarged face view of one corner of the. slab, showing a modification in the shape of the depressions or indentations which are formed in the face thereof.
Referring now to the drawings, and first to the form of the invention shown in Figures 1 and 2, 10 designates the body portion of an acoustic slab which may be of suitable dimensions, and which preferably is about 1" in thickness. The acoustic slab may be made of any suitable material; one form being a suitable mineral plastic material, precast and dried or baked with certain depressions or indentations 11 in its outer or exposed face 12 which have a definite predetermined coeflicient of absorption. As shown in Figures 1 and 2 these depressions or indentations 11 may be of any desired number and depth within a given surface area, such as per square foot, and such depth and number of the openings 11 may be standardized so that the degree of absorption of these slabs may be known and they may be installed accordingly.
From Figure 2 it will be noted that the openings 11 are of sufiicient depth only to provide the necessary air cushioning pockets, the depth being varied according to the diameter and number of openings 11 used to maintain a predetermined co-eflicient of absorption, and from Figure 4 it will be noted that the shape of the openings may be varied at will for the purpose of ornamentation or to otherwise produce different results. Another feature of the openings 11 in the face 12 of the slab, is that the openings, indentations or other surface depressions or interruptions of the slab may vary in shape, width, length, depth or diameter, according to the general configuration desired, in the same block or slab, or the opening 11 in each slab may be all of-the same diameter and depth. The openings 11 may also be arranged as desired relatively to one another so as to produce various designs or configurations on the face 12 of the slab to properly absorb sound.
' By having the body portion of the slab of adense and rigid material it has a very low and practically negligible sound absorbing quality and is rigid and permanent as to shape and density. -The provision of the indentations 11 in the face 12 of the slab 10 effects a mechanical means of absorption which is positive and permanent and which, when once ascertained with a certain number and size of indentations for a given surface area of slab, may be definitely used to various degrees for obtaining a desired co-efiicient of absorption.
It is a well known fact that co-eflicients of absorption of materials are at the present time being scientifically ascertained by means of instruments made for that purpose.
The co-efiicient of absorption of each slab 10 is determined by the number, depth and diameter of the indentations or openings in the face 12 of the slab. By changing the number, depth and diameter of the indentations 11 in any given area, the co-eflicient of absorption is naturally changed.
When, by experiment, it is found that avcertain number of indentations of a known depth and diameter produce a definite co-efiicient of absorption in one slab, for example; percent absorption, other slabs with higher and lower coeflicients of absorption, for example; or 30 percent absorption, may be constructed with a proportionately greater or lesser number of the openings of the first slab.
This change in the co-efiicient of absorption may also be effected by changin the relative depth or diameter or shapes of the indentations without changing the number thereof.
When the number of indentations of a given diameter and depth is determined for a given surface area of slab, any number of slabs may be constructed accordingly, and all of theseslabs will have the identical coefficient of absorption.
In Figure 3 the modified construction of acoustic slab 13 has in its outer face 14 a rela- I .tively large number of openings or indentaard slabs may be manufactured and the same may be used as selected in a wall structure as necessity demands for establishing desired, and correcting any defects, in the acoustic properties of the building.
In the enlarged fragmentary view, Fi ure 4, the openings 16 in the face of the sla l7 arerelatively lar e and are of polygonal form, and it is understood that the openings 16 may be of any desired shape or configuration for ornamental or other purposes.
The structure of this fire-proof, non-deformable, hard and unyielding slab is such that the depressions 11 cannot be altered as to size or shape by pressure on or against the slab, nor by rubbin over the surface of the slab; the slab there ore possessing a permanent predetermined and definite co-eflicient of absorption I By means of this invention definite and permanent results are obtainable for desirable hearing conditions in a room.
The slabs 10, 13 and 17 may be of any suitable configuration at their inner or rear sides for securing the slabs to the inner sides of concrete walls or the like, and that in other respects the slabs may be of standard materials, shapes or construction.
What is claimed is:
1. An-acoustic slab, comprising a dense, rigid body portion of fire-proof material having substantially a minimum inherent co-efficie'nt of scan absorption, said body portion having in its exposed face a predetermined number of indentations of a depth and size proportioned to the absorptive qualit desired, whereby to produce an acoustic sla having a permanent and fixed co-eflicient of absorption and which is unalterable in handling and use.
2. An acoustic slab comprisin a tile body portion presenting a sound re ecting outer face, and predetermined and permanent means for imparting a desired co-eflicient of absorption to the slab, said means consisting of a rigid and dense outer face portion on the tile body having indentations therein selected as to depth, diameter and number to impart the desired co-efiicient of absorption to the slab.
In testimony whereof I afiix my signature.
. MARCUS MAZER.
US392316A 1929-09-13 1929-09-13 Acoustic slab Expired - Lifetime US1804884A (en)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615525A (en) * 1942-11-13 1952-10-28 Berner Erling Sound-absorbing board with holes containing debris material
US2747184A (en) * 1950-06-23 1956-05-22 Bell Telephone Labor Inc Wave refracting devices
US2755882A (en) * 1952-04-22 1956-07-24 Maccaferri Mario Acoustic tiles
US2796946A (en) * 1954-07-15 1957-06-25 Ind Res Lab Inc Sound absorbing and correcting material and method of making same
US3080938A (en) * 1961-04-11 1963-03-12 Grohmann Emil Plate-shaped sound-absorbing element
US4160491A (en) * 1978-07-25 1979-07-10 Bridgestone Tire Co., Ltd. Perlite sound absorbing plate and sound insulating wall composed of the same
US4860506A (en) * 1987-03-06 1989-08-29 Daiken Trade & Industry Co., Ltd. Floor panel for floating floor
USD379680S (en) * 1995-09-08 1997-06-03 Fabry Glove & Mitten Co. Palm pad for a glove for prevention of carpal tunnel syndrome
USD381132S (en) * 1995-09-08 1997-07-15 Fabry Glove & Mitten Co. Palm pad for a glove for prevention of carpal tunnel syndrome
US20080000717A1 (en) * 2006-06-29 2008-01-03 Patrick William P Anechoic visco-thermal liner
US20080289901A1 (en) * 2007-03-27 2008-11-27 Coury Charles C Acoustic panel
USD904397S1 (en) * 2019-09-18 2020-12-08 Asustek Computer Inc. Notebook computer
US20220341107A1 (en) * 2019-10-01 2022-10-27 Sealed Air Verpackungen Gmbh Sound absorber
USD1013214S1 (en) * 2021-01-12 2024-01-30 Durlum Group Gmbh Cladding element for building

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2615525A (en) * 1942-11-13 1952-10-28 Berner Erling Sound-absorbing board with holes containing debris material
US2747184A (en) * 1950-06-23 1956-05-22 Bell Telephone Labor Inc Wave refracting devices
US2755882A (en) * 1952-04-22 1956-07-24 Maccaferri Mario Acoustic tiles
US2796946A (en) * 1954-07-15 1957-06-25 Ind Res Lab Inc Sound absorbing and correcting material and method of making same
US3080938A (en) * 1961-04-11 1963-03-12 Grohmann Emil Plate-shaped sound-absorbing element
US4160491A (en) * 1978-07-25 1979-07-10 Bridgestone Tire Co., Ltd. Perlite sound absorbing plate and sound insulating wall composed of the same
US4860506A (en) * 1987-03-06 1989-08-29 Daiken Trade & Industry Co., Ltd. Floor panel for floating floor
USD381132S (en) * 1995-09-08 1997-07-15 Fabry Glove & Mitten Co. Palm pad for a glove for prevention of carpal tunnel syndrome
USD379680S (en) * 1995-09-08 1997-06-03 Fabry Glove & Mitten Co. Palm pad for a glove for prevention of carpal tunnel syndrome
US20080000717A1 (en) * 2006-06-29 2008-01-03 Patrick William P Anechoic visco-thermal liner
US7469770B2 (en) * 2006-06-29 2008-12-30 United Technologies Corporation Anechoic visco-thermal liner
US20080289901A1 (en) * 2007-03-27 2008-11-27 Coury Charles C Acoustic panel
US7721847B2 (en) * 2007-03-27 2010-05-25 9 Wood, Inc. Acoustic panel
USD904397S1 (en) * 2019-09-18 2020-12-08 Asustek Computer Inc. Notebook computer
US20220341107A1 (en) * 2019-10-01 2022-10-27 Sealed Air Verpackungen Gmbh Sound absorber
USD1013214S1 (en) * 2021-01-12 2024-01-30 Durlum Group Gmbh Cladding element for building

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