US1585111A - Floor covering and method of making the same - Google Patents

Description

May 18 1926. 1,585,111

s. REICHERT FLOOR COVERING AND METHOD OF MAKING THE SAME Filed Feb. 27, 1924 Patented May 18, 1926.

UNITED STATES I FLOOR COVERING AND METHOD OF MAKING THE SAME.

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Application filed February 27, 1924. Serial- No. 695,559.

The object of this invention is to reclaim, into a useful product, or products, the discarded outer casings of pneumatic tires, and it is an especial obj eat to convert this hither to waste material into floor coverings such as mats, rugs and running board and foot board coverings.

It is well known that these outer casings are made up of rubber and cord or fabric reinforcement which are cemented and vulcanized into a unitary structure, The presence of-cordor fabric, and in addition, the cement, renders this waste materialva'luable in the formation of my improved product where clear rubber, such as is found in inner tubes would be useless unless some form of binder was added. It is well known that when an .outer casing is discarded, or worn out, the cord or fabric is usually intact, or in good condition, and likewise'the rubber, the

- latter being of an unusually good grade. It

' is also obvious that a worn outcasing is not discarded because the bond between the cord or fabric, and the rubber, is broken or impaired. :Therefore, for the purposes of my invention, "I find in this usually waste material, not only all the qualities, but also, all the'requisites for the manufacture of my improved products.

\ In accordance with my improved method, a plurality of these discarded casings are reduced to preferably a comminuted fineness,

such. for instance as that of granulated sugar. I then thoroughly mix and intermingle the particles with a view of distributing the cord. or fabric particles substantially uniformly throughout the rubber particles. These mixed and ground or macerated particles are then placed in a mold, and in the presence of both heat and pressure, are vu1- canized i-ntoan integral or unitary body of a dimension in accordance with the mold employed. 1 In orderto retain the form to which the material has been: compressed, I preferably subject thebody to a sudden-lowering of temperature before pressure. is released.- a I V My-invention also-resides-inthe product, and'ihas other; features which willbe more more particularly appended claims.

In the drawing 1g. 1 is an edge view of a small size mat made in accordance with my invention.

2 is a plan view thereof. Fig. 3 1s a vertical sectional view of on PATENT oFF caW-f smUEL nnrcnnnr, or SPOKANE, WASHINGTON, assrenon T0 INDIOLEUM UCTS 00., A CORPORATION or WASHINGTON.

form of vulcanizing press for carryingoutmy improved process, the press being shown material.

Fig. 4 is a view similar to Fig. 3, showing the n 1aterial vulcanized and the press in the position which it would occupy' n before pressure 1s exerted to compress the Fig. 5 is an edge view of modified form of mat, hav mg a tread layer incorporated therewith.

Like characters of reference designate similar parts throughout the different figures of the drawing.

As shown, 1 designates a small size floor,

mat which may have impartedrto it any form of design on the face-up side, although I'have shown the same plain, as the design does not form a feature of-my invention.

The main characteristics of this product be- 1 ing its relative thinness, its pliability to fold or be rolled, and its resilience to walking tread. Further, the rubber, of which it is mainly formed, is bonded by an infinitude' of minute fibers distributed substantially uniforml throughout thelength and thickness of tie product, and disposed in an infinitu'de of directions. Thus, it will'be clear that the rubber is reinforced against all the multitude of stresses that any floor coveringcould be sub ected. It is well known that the stresses to which a floor covering is subected, are, to a major extent, compression stresses. Such stresses in tension, to which a floor covering is subjected, are relatively a light, and hence, a product to efficiently perform the functions of a floor covering must be fortified primarilynot only to takecompressive stresses, but in addition, to afford the requisite resilie'n'cy. i

r .Before further developing the novelty and structure of my improved product, I will next describe my improved method of making the same.

For the purposes of illustration of my method, I have shown a vulcanizing structure which is so cbnventional that it is almost diagrammatic in its simplicity for the reason that the claims hereto annexed do not involve or are not addressed to the apparatus.

I take a number of worn-out or discarded outer tire casings and remove any metal in, or entirely remove the stiffened clincher or wheel engaging rims. The casings are then macerated or otherwise reduced in a suitable machine (not shown) to practically the fineness of. granulated sugar, the particles being in what might, in deference to the greatest accuracy, be termed a comminuted condition. Now some of these casings are rc-inforced by cord, and some by fabric, but in practice, this difference is immaterial to my invention. It is also known that rubber cement is employed in the initial construction. Therefore, the resulting prod- 5 uct coming from the reducing machine or grinder consists of a mass of comminuted material composed of fibers of cord or fabric, rubber cement and rubber. 'Some of these particles may consist of all three of these substances, and some may consist of any two and some of any one of these three substances.

In practice, and by reasons of the obvious fact that there is a preponderance of rubber particles, I find it advantageous to thoroughly mix the mass of particles with a v View of substantially uniformly distributing the bonding fibres throughout the mass of rubber particles, and this step may be performed by hand, or any suitable type of machine, dependent upon the scale on which the manufacture is carried on.

The mixed material is now ready for the vulcanizingmold which I will now describe in detail.

The mold portion, as shown, has a flat formed to receive the material. A pressure plung er may be operated from a stem 5,

by any suitable means (not shown) to be lifted out of range with walls 3,'to permit the mold to be charged, and then caused to descend against the material to compress the same in the mold. It will thus be seen that the mold is filled from the top thereof,

and inthis specific embodiment, no means is meant and then the steam may be shut off and cold water admitted to quickly lower the temperature of wall 2, the purpose of which will later appear.

Now assume that the mold chamber has been filled with this comminuted material to a'depth dependent on the desired thickness of the product to be formed, and the pressure to be exerted, as indicated at 13, the plunger 4, will be caused to descend and compress the material 13. At the same time, one or both valves 10, will be opened to supply steam and afford heat necessary to vulcanize the material. may be found desirable to have one pipe 9, connected with a source of supply of steam, the other pipe being a discharge pipe to carry off condensation and afford circulation to quickly heat walls 2 and 3. In any event, heat is applied and as the heat is applied the plunge-r is caused to descend to substantially the position shown in Fig. 4. Preferably, this position is reached before actual vulcanization starts and desirably, the heat application is continued after this position of the plunger has been reached. In fact, a very considerable application of heat will be applied subsequent to the attainment by the plunger 4, of the final position shown in Fig. 4. It is well known that the extent of hardness of the final product, is dependent on the In practice, it

the prolongation of the latter. This is all within the skill of a mechanic skilled in this art, and-need not be detailed herewith- It is suflicient to say that I desire to obtain the plia-bility equal to the average rubber door mat, and hence, the vulcanizing treatment would be gauged accordingly.

After the material has been vulcanized, the valves 10 will be shut off and the valves 12, opened. By suddenly admitting cold water to chamber 8, before releasing the plunger 4, I lowerthe temperature of the product and cause the latter to retain the form to which it has been compressed. Further, by cooling the mold body, the finished product is easily released and does not adhere to the mold and can readily be removed. I find that if I use a thin layer of rubber, not mixed with fibers, and spread the rubber over the bottom 2, and then on top of this layer disposed the mixed material heretofore described, the surface '17 of the finished product will not only be ,continuously smooth but actually polished, or like a polished surface. This thin layer of rubber prevents the fibers from reaching the surface of the product although the fibers can be seen through this finished Therefore, that surface which is next to surface,

the, bottom 2, will be the usable surface of the finished product.

It will be noted that the process, throughout, is entirely a dry process.

By reason of the fact that heat is only applied to the usable face, which is designated at 14, and which is the tread surface, it will be seen that the density is not uniform throughout the cross section. For instance, the tread zone, which 1 indicate at 15, will be a harder and more dense zone than the next zone closer to the plunger l. In other words, the density decreases from the tread surface 14: toward the bottom 16. Now therefore, it will be clear that the less dense area nearer 16, will afford a cushioning area affording the requisite resiliency notwithstanding the relative hardness of the tread area. Hence, I have the advantage of a dense wearing surface without reducing resiliency, which is a feature of great importance in a floor covering for houses and offices.

In tire casings that are worn only slightly and are discarded on account of a" blowout, for instance, there will be a preponderance of rubber with respect to the fibers, but in nearly completely worn out'casings where the tread is almost-gone, the fabric or cord may be equal to the rubber, in volume. Therefore, in making some products, care may be exercised in selecting the casings to be ground or reduced to get approximately the desired relative quantity of fibers with respect to the rubber.

, At any rate, there will be present such a multitude of fine short fibers, extending in every direction, that the bond and re iiiforcement of the rubber content will not only be greater but distinctly different from any other article now known, of this character.

While I have herein before referred totire casings, it will be clear that any fabricre-enforced rubbed will answer my puring a floor covering, which consists, in,

grinding fabric-rubber to a comminuted fineness, in thoroughly mixing the ground mass to substantially completely distribute the fabric throughout the rubber content, in spreading the mixed mass over a mold bottom, in compressing the mass in the presence of heat on one side only to vulcanize the mass into an integral body of the desired thickness, and in suddenly cooling the heated side of said body to retain the form of the latter. a

2. The herein-described method of making a floor covering, which consists, in shredding or comminuting waste fabricrubber, in compressing the reduced mass, and in vulcanizing the compressed mass with heat applied only to the tread portion of the product, whereby the resulting product will have a relatively dense tread por-. tion and a less dense resilient subjacent portion.

3. The herein-described method of making a floor covering, which consists, in comminuting a re-enforced rubber, in compressing the comminuted mass against a thin layer of tread surface forming rubber and vulcanizing the whole into an integral sheetlike floor covering.

4. A floor covering of sheet-like form composed of fabric-rubber comminuted and vulcanized into an integral body and having a relatively hard and dense tread portion and a relatively less dense subjacent cushioning portion.

5. A floor covering of sheet-like form composed of fiber reinforced rubber comminuted and vulcanized into a sheet-like body of varying density and hardness.

In testimony that I claim the foregoing as my own, ll hereby afiix my signature,

SAMUEL summer.

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