US1513900A - Method of reenforcing inner tubes for pneumatic tires - Google Patents

Description

"NW 49 15924. v 1,5139% S'. D. FLOOD METHOD OF REENFORCING INNER TUBES FOR PNEUMATIC TIRES Filed Dec..23 1920 Patented Nov. 4, 1924.

UNITED STATES SAMUEL D. FLOOD, OF KENILWORTH, ILLINOIS.

METHOD OF BEENFORCING INNER TUBES FOR PNEUMATIC TIRES Application filed December23. 1920. Serial No. 432,643.

To all whom it may concern:

Be it known that I, SAMUEL D. From), a citizen of the United States, residing at Kenilworth, county of Cook, State of Illinois,

have invented a certain new and useful Improvement in Methods of -Reenforcing Inner Tubes for Pneumatic Tires, and de clare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

Many attempts have been made to produce inner tubes for pneumatic tires which shall have reenforcing tread portions more or less undercompression so that the tendency thereof will be to close a puncture rather than to make it larger as is the case with theordinary inner tube in which the rubber is at all points under tension when the tire is inflated; but, so far as I know, there has been no method devised for effectively reenforcing an inner tube while the latter is in the form of a complete undivided ring as distinguished from a mere double ended tube. Where the reenforcing is applied to a mere tube it necessitates the forming of a lap joint between the ends of the tube after it has been reinforced, for the purpose of fashioning it into a complete ring, an expedient which is objectionable for many reasons.

The object of the present invention is to 7 produce a simple and novel method for effectively reenforcing a completed inner tube in the form of an annulus, in such a manner that the tread portion thereof will contain materialwhich, when the tube is inflated,

will be under compression.

The various features of novelty whereb my invention is characterized will hereina terbe pointed out with particularity in the claims; but, for a full understanding of my invention and of its objects and advantages,

reference may be had to the following detailed description taken in connection with the accompanying drawing, wherein:

Figure 1 is a side elevation of an annular reenforcing element for an inner tubein the form in which it is originally made;

Fig. 2 is a section on an enlarged scale taken approximately on line 2-2 of Fig. 1; Fig. 3 is a View similar to Fig. 2, showing the reenforcing element turned inside-out and ready to be applied to an inner tube;

Fig. 4 is a iew of an ordinary inner tube partly in cross section and partly in elevation;

Fig. 5 is a view similar to Fig. 4 showing the reenforcing element assembled upon the inner tube; and

Fig. 6 is a view similar to Fig. 2 showing a slight modification.

In accordance with my invention I form a rubber ring or annulus, 1, U-shaped in cross section, as illustrated in Fig. 2, the same being then turned inside-out as shown in Fig. 3, so as to bring the trough of the.

ring on the inside. This manipulation of the ring places the material near the inner surface thereof under compression. The

ring is then cemented or otherwise secured upon an inner tube, 2, of any usual or suitable-construction. The parts may be so designed that the inner tube with its reenforcing annulus will fit into the cooperating casing in such a manner that there will be no considerable amount of stretching of the inner tube and therefore no appreciable reduction of the compression in the reenforcing element. Because the inner tube and its reenforcing element are both initially made in the form of rings, there will be no tendency to form wrinkles as is the case where a straight tubular element has been rein forced and is then shaped into a ring-like structure; and'therefore a frequent cause for damage to the inner tube, which has heretofore resulted from the wearing of the same at points where wrinkles have occurred, is obviated.

In the event that a nail or other sharp device penetrates the tread portion of the inner tube, it passes through a zone of com pression in the reenforcing element and the rubber in this element is pressed tightly against the same so as to prevent the discharge of air. Furthermore, upon the withdrawal of the device which has'caused the puncture, the opening made thereby will instantly be closed.

If desired, the reenforcing annulus may be provided with strengthening means. Thus I have shown in Fig. 3 a reenforcing element, 3, containing within the same a layer of fabric, 4.

- I claim:

1. The method of manufacturing a reinforced inner tube for pneumatic tires which consists in making a trough in the form of a ring, turning the ring inside-out, and securing the ring about an inner tube.

2. The method of manufacturing a reinforced inner tube for pneumatic tires which 1 consists in making a rubber ring U-shaped in cross section turning the ring inside-out so as to bring the trough thereof on the inner side, andthen fitting the ring over an inner tube and securing it thereto.

tion.

SAMUEL D. FLOOD.

In testimony whereof I sign this specifica

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