US2580202A - Reinforced fibrous porous cushioning material - Google Patents

Description

Dec. 25, 1951 A TALALAY ET AL REINFORCED FIBROUS POROUS CUSHIONING MATERIAL Filed .Nov. 17, 1949 2 SHEETS-SHEET l INVENTORS ATTORN" Dec. 25, 1951 A. TALALAY ETAL REINFORCED FIBROUS POROUS CUSHIONING MATERIAL Filed Nov. 17, 1949 2 SHEETSSHEET 2 INVENTORS cflnbe mn was ATTORNEY Patented Dec. 25, 1951 REINFORCED FIBROUS POROUS CUSHIONING MATERIAL Anselm Talalay, New Haven, and Alfred P. Barton, Hamden, Conn., assignors to The Sponge Rubber Products Company, Shelton, Conn., a corporation of Connecticut Application November 17, 1949, Serial No. 127,982

1 This invention'relates to openly porous fibrous resilient materials, particularly of the type comprising a spot bonded network of upholstery fibers suitable for use as cushioning bodies in upholstered furniture or related articles such as mattresses, as distinguished from loose fibrous stufiing materials requiring to be confined within a flexible jacket in order to preserve cohesion of the fibers in performing a cushioning function.

Methods and processes that may be resorted to for making the' improved composite resilient cushioning slab herein claimed are disclosed and claimed in our application divisional herefrom filed in the United States Patent Ofilce November 23,- 1951, Serial No. 257,878.

Reference may be had to ,U. S. Patent No. 1,906,028. granted April 25, '1933, for disclosure of a resilient upholstery material comprising curly intermingled long resilient upholstery fibers such as horse hair, pigs hair, or cattle hair, spot bonded together by a vulcanized flexible adhesive at only their extraplanar points of mutual crossing or close proximity, such coating of adhesive only thinly covering the surfaces of the individual fibers. Such adhesive, which may be latex, is sprayed so sparsely into and through the interstices of the material before vulcanization that it does not fill or to any appreciable extent clog the same. Upholstery material of this kind is commonly called rubberized hair, one trade name for same being "Hairlock." The adhesive coating is commonly appliedin liquid form and then set by heat. In the case of latex it is vulcanized by heat.

Materials heretofore proposed to be combined with rubberized hair as a reinforcing stratum or otherwise have blocked its facial porosity and its self ventilating or respiratory properties which make it durable and cool to bodily contact. Former attempts at reinforcing rubberized hair have objectionably altered the uniformity of its resilient resistance to compression in one or more directions. Nevertheless successful reinforcement is in great need for overcoming the tendency of unreinforced rubberized hair to bottom out" or mushroom sidewise at or near the support surface against which it rests when the material is squeezed against such support by localized pressure, and to guard against surface disintegration or break down of the material at the points of bonding together of its component fibers. -Also multiple plies or blocks of material of unreinforced rubberized hair are difiicult to secure together dependably in broadside surface contact or edsewise contact by the use of conventional 8 Claims. (Cl. 154-54) clips, staples, stitches or other mechanical fastening means because lacking tear strength and having little or no coherence other than that afforded by the weak spot bonds formed by the adhesive coating between individual hairs. Also such material is not sufilciently tough in the absence of jacketed confinement to stand pulling and hauling in sheet form when it is thrown about in piling or packing it at the place of manufacture. Neither does it stand handling well in the necessary processes of fabricating it into combination with conventional structure of upholstered furniture for use as a cushioning pad, as in covering the top ends of a bed work upholstery springs or the like which will wear and gouge it in use.

It is an object of this invention to make rubberized hair materials such as Hairlock" more useful as well as. more versatile and more durable for handling and fabricating into finished articles.

Other objects are to reenforce a thick sheet of rubberized hair on at least one of its broadside surfaces by means of a facing that will greatly increase its tear strength and inhibit its stretching without in any way impairing the desirable porosity of its open stereoreticulate mesh or its resilient flexibility and compressibility or seriously increasing its cost in comparison with ordinary rubberized hair.

A further objective is to attach permanently to a thick sheeting of rubberibed hair by the same latex spraying operation that bonds together its component hairs, a reinforcing medium which during the spraying process is capable, unaided, of supporting and conveying an unlimited continuous length of the loose dry hair fibers in the form of a thick traveling bat.

A particular object of these improvements is to provide a cushion or pad of rubberized hair for covering the ends of a bed-work of upholstery spring coils, which pad shall be of such integral toughness and tearproof strength that it does not become fragmented or upbraided by direct contact with the wires of the upholstery springs even though the burlap usually employed as a protective interlay or covering for the spring ends is omitted. Elimination of such burlap spring covering'z avoids a source of much labor and expense heretofore encountered in the building of upholstered furniture.

The foregoing and other objectives of the invention will appear in greater particular from the following description of a successful em bodiment of the invention having reference to the accompanying drawings wherein:

Fig. 1 is a perspective view of a fairly thick swatch of rubberized hair showing partially pulled away from its top surface a facing that has been bonded thereto in accordance with this invention.

Fig. 2 is a perspective view looking at the reverse or bare side of the same swatch of rubberized hair showing a portion of its corner cut away to expose the underlying facing that has been bonded thereto.

Fig. 3 is an enlarged plan view showing the open-mesh woven structure of a textile herein termed cottonet.

Fig. 4 is a fragmentary perspective .view of a chair with an upholstered seat incorporating a pad of ordinary bare rubberized hair lifted to expose the burlap interlay heretofore found necessary for protecting the rubberized hair from fragmentation by the ends of the underlying bed of springs.

Fig. 5 is a view corresponding to Fig. 4 showing rubberized hair incorporating the invention as it can be used successfully without: an interlay of spring covering burlap.

- Fig. 6 is a plan view of apparatus suitable for making in continuous unlimited length a single ply of rubberized hair reenforced in accordance with the invention.

Fig. 7 is a partly diagrammatical view taken in section on the plane 1-1 in Fig. 6, looking in the direction of the arrows.

Fig. 8 is a view looking toward the left end of the apparatus in Fig. 6.

Fig. 9 is an enlarged fragmentary view taken on the plane 9-9 in Fig. 6 looking in the directicn of the arrows.

10 is an enlarged fragmentary perspective view of the bat of filaments riding on a coarse mesh net to which the bat becomes bonded while borne by the net.

In Figs. 6 to 10, suitable-apparatus is pictured in part diagrammatically for practicing'methods and making a product incorporating: the invention. Most of such apparatus is familiar to tex- There is a feeding hopper l3 suptile workers. plied with preferably curled animal hair or with comparable dry and loose coarse upholstery fibers I2 which may be of vegetable or mineral derivation, and which delivers such fibers continually in automatically determined amounts onto an endless conveyer belt ll which carries them into the garnett machine l5. Here the fibers are carded and finally doffered onto an uphill endless conveyer belt l6 which leads to the top end of the oscillating camel-back lapper l1. The downwardly extending double conveyer of lapper i1 swings automatically back and forth across the path of advance of a continually traveling endless conveyer belt l9 which precedes in series two neighboring endless conveyer belts and 2|, the latter of which passes through the heat zone of a vulcanizing and drying oven 22.

As an illustrative way to provide in one form an open stratum of strands to serve as a porous facing in the finished product, therev is fed from a roll 26 01: preferably coarse mesh textile netting 21, known to some trades as cottonet," 'a continuous length of said netting having a width about equal to that-of the conveyer belts i9, 20 and 2|. In some instances the weft strands might be eliminated from netting- 21 leaving merely a stratum of laterally spaced apart warp strands 3| or vice versa. Continuous netting 21 rides on these conveyer belts serially and travels in unison with the top stretches thereof while a crosslapped depositing of bare filaments from the lapper l8 onto netting 21 continually takes place while the latter is being conveyed atop conveyer belt I. The bare filaments are deposited at a proper rate to form a continuous dry bat 29 of uniform weight density, say between one and two inches thick, consisting of an entanglement of bare and preferably curly hair or upholstery filaments loosely associated in dry, fiufiy intermingled condition so as to form extraplanar intercommunicating interstices throughout the bat between the fibers thereof. In this condition the dry bat 29 is borne by the netting 21 and is thus continually carried upward on the inclined conveyer belt 20 and then transferred to the horizontal conveyer belt 2| somewhat in advance of the entrance of belt 2| into oven 22.

. With the traveling dry bat of fibers 29 borne by and carried in unison with the netting 21, all of these parts progress in unison toward the right in Figs. 6 and '1 and before entering oven 22 advance to a wetting station where is located a downwardly directed spray nozzle 32. While netting 21 is preferably strong enough to serve as the sole traveling support for bat 20, both bat and netting are herein illustrated as resting on and traveling in unison with the porous mechanical conveyer belts i9, 20 and 2|.

In practice, the spraying station which includes nozzle 32 may have a plurality of like stationary spray nozzles distributed crosswise the path of conveyer travel, or one or more spray nozzles such as 32 may be mechanically arranged to traverse'the traveling bat automatically and constantly while projecting a Jet of liquid agglutinant or adhesive such as latex or some other dispersion of an elastomer or substance having substantially the resilient deformability of soft rubber downward so as first to encounter the bat 29 and then penetrate the same far enough to reach the netting 21 or any other open stratum of strands that may be employed in the place thereof. Such bonding liquid is kept from accumulating and matting or gumming up the bottom interstices of the bat or the meshes of the net because of the coarseness of the meshes of, both the net 21 and of the flexible crosswire construction 23 of metallic conveyer belt 2|. In whatever form the stratum of strands such as 3| may assume, the openings between the strands in such strata should be at least as spacious as the smallest of the interstices between the fibers of the sprayed bat in order not to clog the otherwise porous face of the bat of fibers and impair its ability to pass respiratoryv air freely therethrough. A stratum of strands for the purpose of this invention should be separated by openings sufilciently spacious to prevent individual strands from hampering the flexibility of their neighboring strands so that the entire stratum of strands shall offer substantially no greater resistance to fiexure and crumpling than do the individual strands of the stratum. Thus said stratum of strands effectively reeni'orces the tear and stretch resistant strength of the said network of fibers without adding appreciable resistance to compression thereof in any direction.

The sparsity of the liquid latex or other bonding material sprayed from the jet or Jets 24 is such that it .fails to fill or clog the voids or interstices in the open structure of bat 29. It merely coats the surfaces of the individual filaments or hairs thinly but sufflciently to cause tiny globules or fillets of the sprayed liquid to collect at the coplanar crossing spots of the mutually contacting or closely adjacent filaments throughout the bat. vulcanization of the liquid coating in oven 22 causes a permanent flexible and stretchable spot bonding at these coplanar crossing points of the individual filaments and at the same time causes a dependable permanent bond of the same spot confined nature in a commonplane between the strands of netting 21 and only those fibers of the bat which lie close to or in contact with such strands. Thus, this latter bonding takes place at coplanar spots where individual fibers |2 touch or nearly touch the spaced apart stout woven weft or warp strands 30, 3| of the net 21 and may, therefore, also be referred to as spot bonding in a sense that distinguishes from a more solid or clogging type of bonding that would result if a continuous layer of the liquid adhesive were caused to build up in the interstices of the sprayed bat at the level of surface contact between the bat and some nonporous fabric facing therefor through inability of excess liquid adhesive to pass or drain through such nonporous fabric. The fact that the openings between strands in netting 21 are at least as large as the smallest of interstices in the sprayed bat enables all excess spray of latex to pass through the netting and drain out of the bat.

When the thus sprayed and vulcanized netting and bat leaves the right end of oven 22 in Figs. 6 and '7, they cohere tenaciously and form to all intents and purposes an integral structure capable of traveling without disruption around the idler pulley 33 as shown in Fig. 9.- They are then immediately received onto a second horizontal conveyer belt 34 spaced below belt 2| and traveling in the opposite direction through oven 22 at the same linear speed.

On belt 34, however, the combined bat and netting have become turned upside down so the netting is now on top. In this condition the traveling material is subjected to another downward spraying of latex or vulcanizable bonding liquid by the nozzle or nozzles 35 at a second wetting station which causes the direction of the spraying to be opposite to that of the first spraying with respect to the bat and netting so that this time the spray jet first encounters the netting and easily passes therethrough before it enters the bat of previously bonded filaments 29'. The second coating of bonding liquid does not fill nor clog any interstices of the already rubberized hair or its reenforcing net but does increase the strength of bonding of the net to the bat. Mechanical belt 34 is porous at least to the extent of netting 21 as also is belt 2|.

After this second spraying operation, the material again passes through oven 22 then around a second idler pulley 36 and back through the oven a third time on the conveyer belt 31 which may be porous like belts 2| and 34 permitting a continued application of heat to more thoroughly vulcanize and dry the product so that it becomes conditioned to be ready for use as it continually passes out of the oven and off from the conveyer belt 31. 1

The various driving and idler pulleys which support the belt conveyers hereinbefore referred to are not individually mentioned herein but are shown diagrammatically in the drawings. Their construction may be conventional and is well understood to workers in the art.

After the continuous length of finished product finally leaves the vulcanizing oven it is severed by suitable shears into desired sizes of sheet,

slab, or block-like shapes for whatever particular purpose the material is to be used. Figs. 1, 2 and 3 illustrate in enlarged detail the nature of the finished product, Fig. 3 showing details of a preferred distribution of the widely spaced apart weft threads 30 which may suitably be of stout cotton and which cross the widely spaced apart pairs of iwarp threads 3| of the same size and material. They are arranged more closely together near the lengthwise border of the textile than elsewhere and are amassed very closely together at the edge of same to form a strong selvage enabling the net to be more resistive to skewing in this border portion of its weave as well as stronger and more stable as a carrier for the bat as well as adding considerable tear strength to the border of the product shown in Fig. 2. In fact, net 21 is thereby constructed so strongly that it alone may serve as conveyer for the bat 29 and 29' without depending on underlyingmechanical conveyer belts such as I9, 20, 2|, 34, 31, etc. Strength of this degree is highly desirable. in handling vulcanized product as for instance'where the weight of a sheet of the completed web material as large, say, as a mattress subjects the edge of the sheetto severe tearing strain when the sheets are picked up and piled or thrown about in factory processes.

When it is desired to combine the thicknesses of several sheets of the material shown in Fig. 2, one ply may be placed upon another in the manner of laminae with an adhesive first applied therebetween andthe composite layers can then be vulcanized to produce a permanent allover surface bonding from which results an integral cushioning body of any desired thickness and proportions. In a material so constituted there will be a layer of the netting against both faces of each layer of rubberized hair. This serves greatly to reenforce the finished body as a whole. If it is desired to fasten together single layers of the product by sewing or stapling them face to face or edge to edge, the close woven selvage of the textile net will take the strain of all pulling that might otherwise tear the layers apart. As shown in Fig. 2 cutting away the rubberized hair from the net can leave exposed a bare area of the net which may be overlapped by the rubberized hair of an edgewise adjoining sheet, slab or block so that a continuous extent of the stout net overlaps the adjacent borders of edgewise adjoining sheets of the rubberized hair thus forming a very tough bond therebetween when the overlapping rubberized hair is bonded to the overlapping border of the bared net by merely a vulcanized adhesive.

Figs. 4 and 5 illustrate one important practical advantage of the improved material in the upholstering of chairs. Where ordinary bare rubberized hair 40 is used as a surface pad between the tapestry outer covering 39 and the springs of a cushioning seat it has for years been the practice to apply an insulating layer of burlap 4| between the rubberized hair and the tops of the metal springs 42 to prevent the springs from wearing into and fragmenting the bonded filaments of, rubberized hair. Fig. 5 illustrates the elimination of the burlap 4 I- that is made possible by the superior toughness of the rubberized hair pad 43 incorporating this invention. This not only saves the expense of the burlap but also the greater amount of work involved in uphol- 7. from the superior coherencer toughness-and strength of this improved cushioning material lead to an increased usefulness greatly in excess of any small increase of cost occasioned by the net. The appended claims are directed to and intended to cover all substitutes and equivalents for the illustrated processes and structures that fairly come within the broadest interpretation of the claim-language. I

We claim:

l. A composite resilient spaciously intersticed cushioning slab compressible in all directions with substantially equal ease, embodying in a major portion of its thickness acomp'ressible and stretchable bat comprising a stereoreticulate open assemblage of mutually entangled resilient fibers each having a thin all-over coating of a vulcanized dispersion of elastomer bonding said fibers together only at spots "of mutual contact or close proximity, said coating being sufiiciently sparse to leave vacant between said bonded to-' gether fibers spacious communicating interstices,

a minor portion of the thickness of said slab at a face of said bat comprising an open stratum of laterally spaced apart flexible reinforcing strands each continuous in length and lying along and against said face and covered substantially all over their exposed surfaces and on both sides of said stratum by a continuous coating of a vulcanized dispersion of elastomer sufilciently sparse to leave vacant between said strands sufficiently broad spaces to prevent individual strands from opposing the free ability of strands on opposite sides of said spaces to flex individually, each of said strands being bonded individually to separate fibers by connecting extensions of their said coatings of vulcanized dispersion of elastomer confined to spots of mutual contact or close prox imity of each said fiber and strand, whereby the presence of said strands reinforces the stretching and tear-strength of said bat while leaving the slab compressible with equal ease in all directions and whereby said interstices and said spaces are unclogged by said vulcanized dispersion of elastomer leaving said interstices in open communication with said spaces so that said face of the bat is freely penetrable by respiratory air when said slab is squeezed and released.

with substantially equal ease embodying" in a major. portion of its thickness a compressible and stretchable bat comprising a stereoreticulate open assemblage of mutually entangled resilient fibers each having a thin all-over coating of a vulcanized dispersion of rubber bonding said fibers together only at spots of mutual contact or close proximity, said coating being sufficiently sparse to leave vacant between said bonded together fibers spacious communicating interstices, a' minor portion of the thickness of said slab at a face of said bat comprising an open stratum of laterally spaced apart flexible reinforcing strands each continuous in length and lying along and against said face and covered substantially all over their exposed surfaces and on both sides of said stratum by a continuous coating of a vulcanized dispersion of rubber sulficiently sparse to leave vacant between said strands sumciently broad spaces to prevent individual strands from opposing the free ability of strands on opposite sides of said spaces to fiex individually, each of said strands being bonded individually to separate fibers by connecting extensions of their said coatings of a vulcanized dispersion of rubber confined to spots of mutual contact or close proximity of each said fiber and strand,- whereby the presence of said strands reinforces the stretching and tear strength of said bat 'while leaving the slab compressible with equal ease in all directions and whereby said interstices and said spaces are unclogged by said vulcanized dispersion of rubber leaving said interstices in open communication with said spaces so that said face of the bat is freely penetrable by respiratory air when said slab is squeezed and 2. A composite spaciously intersticed resilient I cushioning slab as defined in claim .1, in which the said strands comprise widely separated warp threads interwoven with widely separated weft threads to form an open mesh netting.

' 3. A composite spaciously intersticed resilient cushioning slab as defined in claim 1, in which the said strands are stout cotton threads woven together to form an open mesh net of continuous length having warp threads of graded proximity forming a selvage at the longitudinal margin thereof, thereby to increase the tear strength of the web both in use and for service as a travelling conveyer for the said fibers during the fabrication of said slab. 4

4. A composite spaciously intersticed resilient cushioning slab as defined in claim 1, in which the said strands comprise a plurality of widely separated pairs of closely adjacent warp threads interwoven with widely separated single weft threads to form a netting. v

5. A composite resilientspaciously intersticed cushioning slab as defined in claim 1, in which the said spaces between the said strands are at released.

7. A resilient compressible spaciously intersticed cushioning body reinforced against stretching along at least one surface thereof without clogging the interstices of said body at said surface, comprising, a bat of openly entangled fibers containing spacious intervening freely communicating voids opening through the surface of said bat, a stratum of relatively long flexible strands of greater tensile strength than said fibers lying against said surface of the bat separated, by spaces at least as broad as said voids, thin coatings of a vulcanized dispersion of rubber completely sheathing all surfaces of the respective fibers and completely sheathing all exposed surfaces of the respective strands on both sides of said stratum, and separate fillets of the same vulcanized dispersion connecting said fiber sheathing coatings to said strand sheathing coatings only at separated spots of contiguity of said strands to said fibers-said strands being sumciently sparse and widely spaced apart to prevent individual strands from opposing the free ability of the nearest neighboring strands to flex individually, and said fillets being sufficiently more narrow than said voids and sufilciently more narrow than said spaces to avoid clogging the same, whereby said voids are maintained in sufliciently open communication with said spaces to permit the free passing of air into and out of said voids between said strands occasioned by compressing and releasing said cushioning body.

8. A resilient compressible spaciously intersticed cushioning body reinforced against stretching along atv least one surface thereof without clogging the interstices of said body at said surface, comprising, a bat of openly entangled fibers containing spacious intervening freely communi- 9 eating voids opening through a surface of the bat, a stratum of relatively long flexible strands of greater tensile strength than said fibers interwoven to form an open mesh net and lying against said surface of the bat separated by meshes at least as broad as said voids, thin coatings of a vulcanized dispersion of rubber completely sheathing all surfaces of the respective fibers and completely sheathing all exposed surfaces of the respective strands on both sides of said stratum, and separate fillets of the same vulcanized dispersion connecting together said fiber sheathing coatings and connecting said fiber sheathing coatings to said strand sheathing coatings only at separated spots of contiguity of said strands and of contiguity of said strands to said fibers, said fillets being sufilciently more narrow than said voids and sufliciently more narrow than said meshes to avoid clogging the same, whereby said voids are maintained in sufficiently open communication with said meshes to permit 10 free passing of air into and out of said voids through saidmeshes occasioned by compressing and releasing said cushioning body.

ANSEIM TALALAY. ALFRED P. BARTON.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Numer Name Date 1,593,956 Sill July 2'7, 1926 2,003,935 Howard June 4, 1935 2,054,131 Kollek Sept. 15, 1936 2,080,886 Fowler May 18, 1937 2,282,170 Cunnington May 5, 1942 2,341,130 Unsworth Feb. 8, 1944 2,374,540 Hall Apr. 24, 1945 2,455,534 Talalay Dec. 7, 1948

Claims (1)

1. 6. A COMPOSITE RESILIENT SPACIOUSLY INTERSTCED CUSHIONING SLAB COMPRESSIBLE IN ALL DIRECTIONS WITH SUBSTANTIALLY EQUAL EASE EMBOAYING IN A MAJOR PORTION OF ITS THICKNESS A COMPRESSIBLE AND STRETCHABLE BAT COMPRISING A STEREORETICULATE OPEN ASSEMBLAGE OF MUTALLY ENTANGLED RESILIENT FIBERS EACH HAVING A THIN ALL-OVER COATING OF A VULCANIZED DISPERSION OF RUBBER BONDING SAID FIBERS TOGETHER ONLY AT SPOTS OF MUTUAL CONTACT OF CLOSE PROXIMITY, SAID COATING BEING SUFFCIENTLY SPARSE TO LEAVE VACANT BETWEEN SAID BONDED TOGETHER FIBERS SPACIOUS COMMUMICATING INTERSTICES, A MINOR PORTIONS OF THE THICKNESS OF SAID SLAB AT A FACE OF SAID BAT COMPRISING AN OPEN STRATUM OF LATERALLY SPACED APART FLEXIBLE REINFORCING STRANDS EACH CONTINUOUS IN LENGTH AND LYING ALONG AND AGAINST SAID FACE AND COVERED SUBSTANTIALLY ALL OVER THEIR EXPOSED SURFACES AND ON BOTH SIDES OF SAID STRATUM BY A CONTINUOUS COATING OF A VULCANIZED DISPERSION OF RUBBER SUFFI-

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