US1379314A - Inner liner for tires - Google Patents

Description

A. L. SEWELL.

INNER LINER FOR TIRES.

APPLICATlOh HLED JUNE :6, 1920.

1,379,.3 1 4. Pasented May 24, 1921.

UNITED STATES PATENT OFFICE.

ARTHUR L. SEWELIi, OF CHICAGO, ILLINOIS, ASSIGNOR OF ON E-TI'IIRD TO EDWARD J. MORAN AND ONE-THIRD TO JAMES A. GBEELEY, BOTH OF CHIGAGQILLINOIS.

INNER LINER FOR TIRES.

Specification of Letters Patent.

Application filed June is, 1920. Serial no. 389,373. 1

T 0 all whom it may concern:

Be it known that I, ARTHUR L. SEWELL, a citizen of the United States, resident of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Inner Liners for Tires, of which the following is a specification.

The invention relates to an inner liner for pneumatic tire casings.

It is an object of the invention to provide an inner liner for outer casings of pneumatic tires adapted to be interposed between the inner inflatable tire tube and the outer casing for the purpose of protecting the former against puncture and reinforcing the latter against blow-outs, and which will also serve to increase the wearing quality of the outer casinguwithout, however, destroying its resiliency.

It is also an object of the invention to provide an inner liner capable of adapting itself to the exact size of difierent makes of tires so that the liner in operative position will not be normally under undesired stresses.

A further object of the invention aims at the provision of an inner liner which is c provided with reinforcing elements arranged in such manner that the flexibility of the liner and its resiliency is thereby not diminished.

It is a further object of the invention to provide reinforcing elements of pliable material such as brass, which may be insistently bent without breaking.

A further object of the invention aims at the provision of an inner liner which is produced in straight lengths capable of being arranged in annular form with the ends overlapping and said overlapping ends beveled so that the liner throughout the circumference has the same cross-section which decreases from a central thickened portion in both directions.

A further object of the invention aims at the provision of an inner liner which is made of the identical material as the outer casing or inner tube, and which is devoid of fabric.

Another object of the invention aims at the provision of an inner liner which has its reinforcing elements extending transversely to the longitudinal axis of the liner when in fiat condition and which elements are arranged in the thickened or tread port1on of the liner.

Patented May 24,1921.

A still furtherobject' aims at the formation of such elements to the effect of providlng anchoring engagement between said elements and the liner. 7 a 1 r It is a stillfurther object to arrange the reinforcing elements in staggered relation with respect to one another, so that flexibility of the liner is preserved to a high degree.

To the accomplishment of the objects stated and others that Will'bGCOIl'lG apparent as the description of the invention proceeds, a preferred embodiment of the invention is described in the following specification, particularly pointed out in the claim and illus trated inthe accompanying drawing, in which:

Figure 1 is a detailed View in perspective and section illustrating the inner liner as applied;

Fig. 2 is a top plan view of the innerliner in fiat condition, as originally manufactured; a V a Fig. 3 is a sectional view, the section being taken on line 3-3 ofFig.2;"

Fig. 4 is afragmentary portion of the liner with upper layers of rubber cushion gum removed to expose theembedded reinforcing element;

Fig. 5 is an enlarged view to disclosethe 7 form and arrangement of the reinforcing elements; I

Referring to the several vlews of the drawing, 10 designates a wheel body whlch is provided with a clencher rim 11, capable of holding in position the outer casing 12 of a pneumatic tire. The inflatable tube 13 is arranged within the outer casing 12 and in terposed between the outer casing and the inflatable tube is a liner generally indicated by 14. The liner 14 is manufactured in straight lengths provided with beveled ends 15 and 16 which, when the length 14 is arranged in annular form, overlap, thereby enabling the liner to adapt itself to various sizes and types of tires. In accordance with the standard sizes of tires, different lengths will be manufactured, but, as slight variations occur between various types of tires, these variations are taken care of by auto= matic adjustment of the liner, upon being arranged in annular form with the beveled ends in overlapping relation.

1n constructing the liner, two plies of material 17, known the art as compound rubber cushion gum, are cut to the required size of a thickness approximating one-eighth of an inch gage. It is to be understood that the invention is not limited to the exact materials as described, nor to the dimensions as given which are merely indicated as pree ferred embodiments thereof by way of example. Upon thelayer 17 a plurality of reinforcing elements 18 and 19 are arranged which are made from pliable metal such as brass with any other material meeting the particular requirements of reinforcingelements. "The reinforcing element 18 comprises circular end portions 19 and the body portion; of theelement hasside edges which "form a plurality of arcs 20. Due to this constructionthe meeting'points of the circular end portions'and the arcs at the side edges define corners 21 for a purpose hereinafter further specified.

The reinforcing elements 19 are slightly different fromthe elements 18, but, in gen- "eral, have the same form. They also comprisecircularend portions 22, but the side "edgesgo'f the body portion merely constitute one a'rc23. 'The meeting points of the circular portions and the arc define corners 2 As particularly indicated inFig. 5, the reinforcing elements 18 when placed on the material 17, are arranged in spaced relation too'n'e another. The elements 19 are placed in which the reinforcing elements are immovably held without, however, diminishing resiliency of the liner in longitudinal or transverse direction. In the completion'of the lines, the material 25 penetrates between the reinforcing elements 19 and 18, slightly lifting the former so that the two types of as a) ears more clearl in Fi 3.

vent creeping.

reinforcing'elements are arranged in staggered relation, with respect to one another, This staggered arrangement 7 of the -reinfor.cing elements in the liner. aids; to preserve the original resiliency of the liner which would otherwise be slightly diminished by the incorporation of the reinforcing elements. As shown in Fig. 1, the reinforcing members are arranged in the thickened portion 26 of the liner, constituting the tread portion thereof. The liner then mer es into side portions 27 01"Cl1IIl1ll1Sll8d thickness as is common in the construction of inner liners.

Attention is called to the fact that the liner is composed ofcompound rubber cushion gum only; 21s., is devoid? of any fabric and that the reinforcing element, while leaving the flexibility and resiliency of the liner practically unaltered, nevertheless, is

iinmovably held within the liner. This is accomplished by 'the' provision of the plurality of corners 21 and 24, respectively, whereby a good anchoring engagement is effected between the reinforcing elements and the liner. 7 I

In first applying the liner'to a pneumatic tire, the inner surface of the outer casing is powdered w th soap stone, talcum powdeigor the like. The liner after being arranged in functional position, enters into a 'good engagement with the outer casing and the" tube and, being of the same material, no friction exists between these parts.

While the drawing discloses'apreferred embodiment of the invention, various changes and alterations areincluded which fall within the purview of the invention,-as

defined the appended claim.

I'claimj: I

I An inner liner for 'tires comprising a substantially ci'escent shaped member jhaving embedded therein a series of overlapping, spaced and elongated reinforcing elements disposed in sequence throughout the entire "length of said member, each of said reinforcing elements being transversely arranged 'with reference to the said member and provided withcorrugated edges to pre- In witness whereof I tLffiX my signature. ARTHUR L. SEWELL.

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