US 1925453 A
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Sept. 5, 1933. J. MAZER 1,925,453
SOUND ABSORBING STRUCTURE Filed Dec. 22, 1928 Patented Sept. 5, 1933 UNITED STATES PATENT OFFICE Application December 22, 1928 Serial No. 327,968
My invention relates to sound-absorbing materials and a method of making the same, and more particularly to materials for facing the interiors of buildings, and materials which not only possess desirable acoustical or sound-absorb- .ing properties, but which may also be utilized in the Walls of buildings as sound and heat insulation.
One object of my invention is to provide a material of the character referred to, which is of -simple and cheap construction, but which is nevertheless highly eicient.
Another object of my invention is to provide a sound-absorbing material of such form that it may be readily applied to Walls, iloors, ceilings and the like, which presents a smooth exposed surface and which may be conveniently painted or otherwise finished in a decorative manner.
Some of the forms which the invention may take are shown in the accompanying drawing, wherein Figure 1 is a horizontal sectional view of one form of wall structure in which my soundabsorbing units are employed; Fig. 2 is a perspective view of a portion of a Wall to which the units are applied as in Fig. 1; Fig. 3 is a view, on an enlarged scale, of one of the units of Figs. 1 and 2, in a preliminary stage of formation; Fig. 4 is a view showing the unit of Fig. 3, crushed or deformed to produce a desired acoustical or heat-insulating property; Fig. 5 is a composite structure involving a plurality of the units of Fig. 4 in laminated relation; Fig. 6 is a face view of the structure of Fig. 5; Fig. l shows a structure similar to Fig. l, but illustrating another manner in which the units may be applied to a wall; and Figs. 8 and 9 are modifications of the structure of Fig. 3, showing still other forms of corrugated board from which the sound-absorbing units may be formed.
Referring more particularly to Figs. 1 to 4, 1 show a wall structure having an outer facing 10, studding 11, an'd sound-absorbing units 12. The units or panels 12 are nailed or otherwise suitably fastened to the studding and have the appearance more clearly shown in Fig. 4. These units are formed of what is generally designated as corrugated board which may be of paper, asbestos sheets, or the like. The boards initially, and in their commercial form, have the appearance shown in Fig. 3. A crimped or corrugated sheet 13 is suitably glued or otherwise secured to face sheets 14 and 15. Due to the fact that only the crimps or corrugations of sheet 13 abut the facing sheets, these are the only points which are glued to the facing sheets, thereby rendering the material free to flex under the influence of sound waves.
I have found that by crushing the board, through pressing of the sheets 14 and 15 toward one another, a very efficient sound-absorbing or c() heat-insulating unit is produced. The crushing of the board results in the formation of a great number of grooves or recesses in the crimped sheet 13, as compared to the fewer number of larger recesses or grooves, present in the board of Fig. 3, and also results in the elimination of the stiffness and comparative rigidity of the board, by reason of the fact that the truss-like effect of the corrugations is destroyed, rendering them yieldable, and the lms of glue employed for securing the sheets 13, 14 and 15 together are broken up, thus permitting the sheets 14 and 15 to bend or yield under the influence of sound waves.
The yieldability of the structure after crushing results in a greater coeicient of sound absorption. Furthermore, it can be readily handled and cut to t desired locations without affecting its acoustical properties.
Where greater sound-absorbing capacity is desired than is possible through the employment of single-layer panels, as shown in Figs. 1 and 2, I will arrange a plurality of the units of Fig. 4 in laminated relation, as shown in Fig. 5, such laminations being held together by wire stitching 16, if desired, or they can be simply fastened to a wall structure without being Iirst assembled as a unit.
1t will be apparent that the corrugations of adjacent composite sheets entering into the con struction of Fig. 5 may be disposed at right angles to one another instead of having the grooves in the sheet of each layer extendingparallel to the l groovesof the adjacent corrugated sheet, thus producing a panel of greater strength and different acoustical properties than possessed by that shown in Fig. 5.
1n Fig. 7, 1 show a structure wherein the units l2, instead of being fastened directly to the studding, may be fastened to the faces of a partition or wall, by gluing at various points, as indicated at 17.
1n order to prevent absorption of moisture by the panel from within the wall structure, l contemplate the water-proong of either the at sheet lying next to the framework or studding, or the corrugated sheet. It will be understood that the inner flat sheet of paper may be omitted, if desired, and the corrugations bear directly against ther supporting framework. The Waterproofing may be effected by coating or impregnating the sheet with material having an asphalt base or other suitable water-proofing material.
Instead of crushing the units before placing them in position upon a wall, I may rst fasten the unit of the corrugated board of Fig. 3 to the wall and then crush it. This procedure results in the edges of adjacent units being brought into snugly abutting engagement. Furthermore, the units may be marketed as shown in Fig. 3 and may be crushed by a desired pressure, to suit acoustical conditions or requirements at the particular places Where they are to be employed, it being understood that the acoustical properties of a board crushed by a given force will be different than if the board were crushed with a much greater force.
The degree of yieldability of the material will depend to some extent upon the sizes of the units. If a, given area is substantially coextensive with the exposed surface of a unit, such surface will yield more readily than if it merely constituted a portion of a larger unit.
In Figs. 8 and 9, I show still other forms which the corrugated board, similar to that of Fig. 3, may take. Various other modifications can obviously be made, if desired, including the omission of one sheet of the facing 14-15, for example.
The type of sound-absorbing structure abovedescribed lends itself readily to almost unlimited forms of decorativeness, either before or after being put into place, thus making it more desirable than those sound-absorbing materials which cannot be decorated or which can at most be decorated only to a, very limited extent.
recente While the term wall is employed in the appended claims, it will be understood that the term is used in its broad sense to include ceilings, floors, columns, beams, and any other structure to which the units may be applied.
I claim as my invention:--
l. A sound-absorbing unit having a base and a crimped sheet of yielding material carried by the base, the crimps extending laterally and irregularly from the plane of the base, at various separated points.
2. A. sound-absorbing unit comprising facing sheets and an interposed corrugated sheet, the corrugated sheet having a major corrugated contour and being also crimped along the length of the corrugations.
3. A sound-absorbing unit comprising a body of yieldable material that has been preformed with convex contours, and thereafter permanently deformed in directions toward a given plane of the body, to produce creases and crimps.
4. A sound-absorbing unit comprising a body of yieldable material that has been preformed with convex contours, and thereafter permanently deformed in directions toward a given plane of the body, to produce creases and crimps, the deformed areas constituting the major portion of one face of the unit.
5. A sound-absorbing unit comprising a plurality of layers of yieldable material, each layer containing creases and crimps produced by permanently deforming preformed convex contours in directions toward a given plane of the layer, and means for maintaining the layers in unitary relation.