US1451304A - Inner tube - Google Patents

Description

Apr. 10, 1923.

, M. P. MITCHELL INNER TUBE Filed Mar. 25, 1920 04, I di SMQ,

Patented Apr. 10, 1923.

MARY PIERSON MITCHELL,A OF EATON, OHIO.

PATENT OFFICE.

INNER TUBE.

Application led March 25, 1920. Serial No. 368,590.

To l u1/10m. it may concern Be it known that I, MARY IIEnsoN MlToH- nm., a citizen of' the United States, residing at Eaton, in the county of lreble and State ot' Ohio. have invented a new and useful Inner Tube, of' which the following is a specification.

to improve generally and to enhan'ce thev utility7 of devices ofthat type to which the invention appertains. I

ll'ith the above and other. objects in view, which will appear as the description proceeds` the invention resides in the combination and arrangement of parts and in the details of construction hereinafter described and claimed, it being understood that, within the scope of what is claimed, changes in the precise embodiment of lthe invention shown can be made without departing from the spirit of the invention.

In the accompanying drawings:

Figure l shows in transverse section, an

inner tube equipped with the reinforcement,

forming the subject matter of this application: Figure 2 is a detail enlarged from Figure 1; Figure 3 is a plan of the reinforcement, the same being laid fiat; and Figure 4 is a diagrammatic cross section showing a modified form of the invention.

In carrying outl the present invention, there is provided a reinforcement including a piece of netting denoted by the numeral 1. .\lthough any desired material may be used in the making of the netting, wire is pre- 'l'erred. and any kind of metal having the necessary characteristics. such as flexibility, resiliency or strength may be employed. 'l`he netting preferably but not necessarily is cleaned in `any desired way'. such as by the application o'f benzine, gasoline, naphtha or the like. although` in practice. it may be found possible to clean the netting mechanically. The cleaning step may be dispensed with, sometimes. but when the best possible results are desired, the cleaning step is resorted to.

After the wire netting 1 has been cleaned, if it is considered desirable to clean the netting, cords 2 may or may not be incorporated in the netting. The cordsmay bemade of cotton. linen or any other suitable substance, and are incorporated with the netting by threading them through the netting or by weaving them into the netting along -With the wires of the netting. It is to be understood distinctly that the cords 2` may be omitted if desired, but when they are used, they aid -in holding the rubber on the netting, as will be explained'hereinafter.

The netting l and the cord 2, if the. cords are used, are treated with a. vulcanizable cement. The cement may be worked into the meshes of the netting by means of a brush or swab, or by hand, or the netting may be dipped into the cement. It may bey desirable to dip the netting into the cement repeatedly. After the netting has been treated .with cement, the cement is dried partially or is permitted to dry. l

This drying operation may be carried out in any desired way. In some instances, the netting is merely hung up and permitted to dry until the cement is tacky enough to' exercise its function Without running or dripping. The netting is incorporated with one or more layers of rubber in any desired way. In `some instances, the netting, covered with the partially dried cement, is rolled into or upon the layer of rubber and the rubber may be coated with cement if desired. Again, as shown in the drawings,

the netting is placed between layers 3 of rubber, before the vulcanizable cement has dried completely, the rubber then being vulcanized, to form, vwith the netting, aI unitary reinforcement.

The reinforcement, constructed as set` forth, is introduced into the tread portion of an inner tube 5, or is placed otherwise therein, as hereinafter explained. As indicated at 6, the reinforcement, in one form of the invention, does not extend entirely around the tube 5, transversely, one half of the tube, more or less, considered trans'- versely being devoid of the reinforcement. In any event, however, the tread portion of the tube is reinforced throughout such an area as is likely to be subjected to puncture. The reinforcement is iexible enough so that it will not interfere materially with ment v is placed inte well adapted to withstand the bending of the tube and since the reinforcement does not extend entirely around the tube, transversely the tube, obviously may expand. The reinforcement extends throughout the M of the tube considered circumferentially. Y

As depicted in F 4L, one reinforcetread of the tube l1, another reinforcement 12 being placed in the inner portion of the tube. The reinforce'ments are spaced apart, along their longitudinal edges, ciently so that the tube may expand.

Refractory material, such as soa-pstone, or asbestos is applied to the outer surface of the tube in any desired way. According to one method of procedure, the outer surface of the tube may be covered thinly Ywith cement and upon this cement, the asbestos 4 is placed. In allu to asbestos, it'is to be understood that an impalpable powder is not employed, the asbestos being the commercial bulk powdered asbestos which falls far short ot being an impalpable powder. Asbestos need not be used, but if it is employed, it serves to prevent the tube from hea, when the tube. frictional contact. with ect to the tlre casing.

It will be obvious that an inner tub-e for tires, constructed as above set forth, will be pinching, and will be strehened and reinforced. It is'well own that, if the inside of a tire casing is cracked slightly, or if the fabric fails, to a slight extent, not enough to produce a blowout, the inner tube, nevertheless, is we pinched and, after a short period -u tears or puncpuneture and v Merece tures. Since the tube forming the subject matter of this application isrreinforced, the tube will not enter readily into small fissures in the inner surface o the casing and be- I come pinched or damaged as aforesaid.'

Having thus described the invention, what l claim as new and desire to protect by Letters Patent of the United States is I-f 1. An inner tube for'vehicle tires, em-

`bodying a layer of yWire netting coated with 3. An inner tube fory vehicle tires em-.

bodying layers of material which are treated with vulcanizable cement; and .9.a layer of wire netting located between the aforesaid layers, the layer of wire netting being coated with adhesive material VVWhich is dried to a point of tacky adhesion. prior to the assembly of the-tube.

4. An inner tube for vehicle tires, em!

bodying a netting composed in part of '-lnetal and in part of cords, the netting being coated withadhesive material which is dried to a point of tacky adhesion prior to the assembly oithe tube.

In testimony that I claim the foregoing as my own, l have hereto affixed my signature in the presence of two witnesses.

nv PiERsoN MITCHELL.

Witnesses: i

CLIFFORD H. STROH, R. A. SAYLOR.

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