US3703793A - Decreasing flexibility aperiodic resilient device for floors, partition walls and like building members - Google Patents

Abstract

The device relates to the construction of buildings and prevents the transmission of any vibrations between the constitutive parts of said buildings. The device comprises an elastic corrugated band to form opposed loops filled with plastic foam, and is placed between a floor and any other part of a building where it is desirable to prevent the transmission of vibrations.

Description

United States Fateni Barrat 51 Nov. 28, 1972 DECREASING FLEXIBILITY APERIODIC RESILIENT DEVICE FOR FLOORS, PARTITION WALLS AND LIKE BUILDING MEMBERS [72] Inventor: Bernard Barrat, Neuilly-sur-Seine,

France [73] Assignee: Productions FAsemes S.A., Pierrefitte, Seine Saint-Denis, France [22] Filed: April 21, 1970 [21] Appl. No.: 30,464

[52] US. Cl. ..52/403, 52/573, 161/137, 161/159, 267/152 [51] Int. Cl ..E04b 1/62, EO4f 15/22 [58] Field of Search ..52/393, 403, 573, 402, 309; 248/21, 22; 161/39, 137, 160, 159; 267/83, 143, 81, 84, 30,152

[56] References Cited UNITED STATES PATENTS 2,576,071 11/19 5 1 Kropa et a1. ..sz/ggg 1,238,668 8/1917 Hinde ..161/137 2,622,051 12/1952 Hermanson et al....161/160 X 1,778,412 10/1930 Balduf ..52/402 2,270,902 l/ 1942 Rubissow ..52/403 X FORElGN PATENTS OR APPLICATIONS 1,156,633 10/1963 Germany ..161/137 Primary ExaminerAlfred C. Perham Attomey-lrnirie and Smiley [57] ABSTRACT The device relates to the construction of buildings and prevents the transmission of any vibrations between the constitutive parts of said buildings.

The device comprises an elastic corrugated band to form opposed loops filled with plastic foam, and is placed between a floor and any other part of a building where it is desirable to prevent the transmission of vibrations.

7 Claims, 4 Drawing Figures 7 DECREASING FLEXIBILITY APERIODIC RESILIENT DEVICE FOR FLOORS, PARTITION WALLS AND LIKE BUILDING MEMBERS his well known that in the constructions of modern buildings, particularly buildings with reinforced concrete ossature, the isolations against the noises and the vibrations are one of the more difficult points.

In an attempt to limit the transmission of the noises between the successive stories of a building, it is known to make floating floors, i.e., that between the floor itself and the concrete floor-plate provided to receive a ground lining, it is interposed either some sand, or synthetic resin plates, or else glass or rock fibers. The handling of glass fibers is not very pleasant for the workers, moreover, the glass fiber is not very strong and may break during its working and, when said glass fibers are used, acoustic bridges are frequently occurring. The same results occurs when one uses plates made of foamed synthetic resins incidentally, the felt isolation is satisfactory only if many layers of felt are placed which highly increases the construction cost. The sand isolation is not very efficacious because the sand is very often impregnated with concrete.

Another transmission of the noises'is causedthrough partition walls which are generally directly anchored either to concrete posts, or to bearing walls also made of concrete, so that even in the buildings comprising floating floors, the noises are transmitted by the ossature and the partition walls.

The present invention obviates to the above mentioned disadvantages by making possible to make resilient aperiodic linkages of all the constitutive parts of a building while always using the same device which may carry important loads and which prevents the transmission of the vibrations whatever be their frequency. Moreover, the device of the invention is of a low cost' and is strong which is very important on a building yard wherein many handlings are made.

According to the invention, the device comprises a band of resilient material shaped to delimit loops having all the same width and which are substantially formed in a mushroom shape the head of the mushrooms being flat and alternately directed upwards and downwards, said loops being further completely filled with a cellular material delimiting two parallel flat areas flush with said flat head of said mushrooms.

Various other characteristics of the invention are moreover revealed from the description which follows.

Embodiments of the invention are shown, by way of non-restrictive examples, in the accompanying drawmg.

FIG. 1 is a broken-away perspective view an embodiment of the flexible isolating device of the invention.

FIG. 2 is an elevation-section view, similar to FIG. 1, of a variant of embodiment.

FIG. 3 is a diagrammatic elevation-section view showing one of the applications of the device.

FIG. 4 is a diagrammatic elevation view partly broken-away showing another embodiment of the invention.

The device of the invention is shown on the drawings under the shape of a corrugated band whose thickness is, for example, of about 3cm, and whose width may vary but which, in most of the building applications is comprised for example between 8 and cm. Said device may be of any length with many devices being placed end to end without being connected together or,

on the contrary, a device may be divided, for example by cutting it with a saw or shears.

The basic element of the device is made by a band 1 made of a resilient material, preferably of steel. This band is corrugated to delimit successive opposed loops which are designated generally by 2, 2a, 2b for the upper loops, and by 3, 3a, 3b. for the lower loops.

With respect to the upper loops, it has been found advantageous to form said loops in order that they have a' plane upperside 2,, transversally extending with respect to the device level with its upper face, this plane upper-side being extended by two corrugations 2 2, having a radius of curvature relatively small, for example of about 0.5 to lcm and extending on an angle of about 60, those curved corrugations being then extended by bellies 2 2,, identical each other, and of which the radius of curvature is substantially bigger than the radius of the corrugations 2 2 The curve of the bellies 2,, 2,, may not be circular, this curve being calculated or chosen as a function of the general characteristics whichare provided to the device and may, for example, be approximately a segment of paraboL' The lower loops 3 are limited by a plane bottomside 3, level with the lower face of the device, said plane bottom-side being connected to the bellies of two successive upper loops by means of curved corrugations 3 3 for example of a semi-annular shape and extending according an angle of about All the space delimited by the successive loops is filled with a cellular material, for example foamed polyurethane resin, this material being flush with the plane parts 2, and 3, of the loops or, at the most, covering said plane parts on a very low thickness and only to protect the metal or other resilient material of the band against oxidation if this is found necessary.

Practically, it has been found advantageous for mak-' ing the loops to use an iron band having a thickness of about 1 mm and to form the loops so that the width or distance d between the axis of an upper loop and the axis of an adjacent lower loop be of about 50 to 60 mm while considering as above explained that'said loops have'a height of about 30 mm.

In the preceding, and to correspond to the embodiment shown on the drawings, it has been used the term of upper loops and lower loops but it is obvious that the device may be placed indifferently on either face, the result being not modified because said device is essentially provided for supporting stresses perpendicular to the plane parts 2, and 3, therefore stresses towards the direction of the arrows of FIG. 1.

Obviously, when the stresses according to the arrows are low, it first results therefrom a distortion of the parts 2,, and 2 because of the shape of said bent parts. At any distortion of said parts corresponds a variable compression of the cellular material placed between the plane parts 3, and 2, and also an absorption of the stress by the distortion itself of said parts acting as springs. I

One sees by the preceding disclosure that a stress causes an elastic distortion of some at least of the loops of the band 1 and that this elastic distortion is deadened or damped in every direction by the filling material of the loops. The device makes thus a kind of selfdeadened or damped spring which is aperiodic i.e., which does not have a natural frequency, and which makes it to be particularly proper to absorb vibrations whatever be frequency of said vibrations.

FIG. 2 shows a variant which essentially relates to embodiment for easily making the spring of the device. As shown by said figure, the upper loops 2 as well as the lower loops 3 are separately made and are connected each other, level with the parts 2 and 2,, by weld spots 4. This embodiment is advantageous because the loops may be easily made by wheel-pleating, then connected together with a spot welding apparatus,.

FIGS. 3 and 4 show two important applications of the device of the preceding figures.

In FIG. 3, reference numeral 5 is a compression floor-plate, for example a floor-plate of a building on which are placed, several spaced devices A according to the invention and extending on all the length or the width of a room. Those devices directly bear on the floor-plate 5 and are covered by a floating floor-plate 6 made of concrete or other material. The distance between each device A depends on the expected load which has tobe carried by the floating floor-plate,

Devices having. the above magnitudes given by way of examples, may carry loads of about'350 to 1,000 g/cm2 and it is from this data that the distance separating each successive spaced devices is determined by computation;

Through the explanation given by the preceding, one founds that the more a device is loaded perpendicularly to its surface, the less it is proportionally distorted, since obviously this device works as a spring, the distortion magnitude of which decreases with the load.

FIG. 4 shows another application of the device of the invention according to which a device 7 is placed beneath a partition wall 8 which may be made of bricks, plaster tiles or any other prefabricated panels, with other devices designated by reference numerals 9 and 10 being interposed between the partition wall 8 and posts 11 and 12. In order to ensure a satisfactory anchoring of the partition wall to the posts, it is advantageous when are used devices used as shown by reference numerals 9 and 10, to fix them firstly to said posts 11 and 12 for example by means of gudgeons l3 and to provide also other gudgeons 14 protruding towards the partition wall, said gudgeons being provided to be embedded in said partition wall, when erected.

One sees on said FIG. 4 that the partition wall is thus resiliently connected to the floor 5 which may be directly constituted by the compression floor-plate hereinbefore described, and also to the posts or to internal walls, so that vibrations which might be transmitted by said posts or internal walls to the partition wall are deadened by the devices of the invention and reciprocally the vibrations which may be produced in a closed room by the partition 8 are nor transmitted to said posts nor to the floor.

Another embodiment which is not shown on the drawings provides to use the device of the invention between a levelling floor-plate and an anchoring and supporting bed-plate of a machine tool. This embodiment makes possible to cancel the transmission of the vibrations or impacts produced when said machine is working.

ICLAIMI l. Apenodlc resilient device, with a decreasing flexibility, comprising a band of resilient material shaped to delimit loops having all the same width and which are substantially shaped as mushrooms, the heads of the mushrooms being flat and alternately directed upwards and downwards, the upwardly and downwardly directed heads of alternating adjacent mushrooms partially overlying one another, said loops being further completely filled with a cellular material delimiting two parallel flat areas respectively flush with said flat heads of said mushrooms.

2. Device as set forth in claim 10, wherein two adjacent loops are connected one to the other by a curved part making a very acute angle with respect to the flat parts of said two adjacent loops.

3. Device as set forth in claim 2, wherein the curved part connecting two adjacent loops is joined to the plane parts of said loops by two opposed arcuate segments.

4. Device as set forth in claim 3, wherein the two opposed arcuate segments are of different radii.

5. Device as set forth in claim 1, wherein the resilient material is a metal.

6. Device as set forth in claim 5, wherein each loop is formed by a portion of corrugated iron, the loops being connected by welding, brazing, sticking and the like, substantially level with the curved part connecting two opposed continuous loops.

7. Device as set forth in claim 1, wherein the band forming the loops is continuously extending along the device.

Claims (7)

1. Aperiodic resilient device with a decreasing flexibility, comprising a band of resilient material shaped to delimit loops having all the same width and which are substantially shaped as mushrooms, the heads of the mushrooms being flat and alternately directed upwards and downwards, the upwardly and downwardly directed heads of alternating adjacent mushrooms partially overlying one another, said loops being further completely filled with a cellular material delimiting two parallel flat areas respectively flush with said flat heads of said mushrooms.

2. Device as set forth in claim 10, wherein two adjacent loops are connected one to the other by a curved part making a very acute angle with respect to the flat parts of said two adjacEnt loops.

3. Device as set forth in claim 2, wherein the curved part connecting two adjacent loops is joined to the plane parts of said loops by two opposed arcuate segments.

4. Device as set forth in claim 3, wherein the two opposed arcuate segments are of different radii.

5. Device as set forth in claim 1, wherein the resilient material is a metal.

6. Device as set forth in claim 5, wherein each loop is formed by a portion of corrugated iron, the loops being connected by welding, brazing, sticking and the like, substantially level with the curved part connecting two opposed continuous loops.

7. Device as set forth in claim 1, wherein the band forming the loops is continuously extending along the device.

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