US939428A - Pneumatic tire. - Google Patents

Description

J.'L. MAITLAND.

PNEUMATIC TIRE. APPLICATION FILED FEB;6

' PaQtented Nov. 9, 1909.

' Wit" eases arl'fiowne-a L rs r F JAMES I4. MAI'ILAND, OF PASSAIC, NEW JERSEY,ASSIGNOE 0F ONE-TEIBD TO WILLIAM A. CALLAN AN, 0F JERSEY CITY, NEW JERSEY, AND ONE-THIRD T0 CHARLES RIDER,

0F MOUNTAINVILLE, NEW JERSEY.

PNEUMATIC TIRE.

I Specification of Letters Patent.

Patented new. a in.

Application flied Fehry 6, 1908. fierial lto. 414,541.

To all whom it may concern:

Be it known that 1, Lines L. Mar nara, a subject of King Edward VII of Great Britain, residing at Passaic, in the county of Passaic and State of New Jersey, haveiinvented certain new and useful Improvements in Pneumatic Tires, of which the folknowledge of the details of construction and the means for efiecting the result, reference is to be had to the following description and accompanying drawings. While the invention may be adapted to different forms and conditions by changes in the structureandminor details without departin from the spirit or essential features thereo still the preferred embodiment is shown in the accompanying drawings, in which:

Figure 1 is a central longitudinal section,

of a portion of a pneumatic tire embodying the invention. Flg. 2 is a cross section of the tire. Fig. 3 is a detail perspective view of a portion of the protective layer arranged between the inner tube and the shoe. Fig. 4: is a detail perspective view of a portion of the inner tube.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

The shoe or casing 1 may be of any-pattern or make generally employed in the formation of pneumatic tires for automobiles and kindred road machines. The shoe or casing illustrated is of the clencher type,

that is, it is open upon the rim side, the

edge portions bordering upon the opening being constructed to interlock with the rim so as to hold the shoe or casing closed when subjected to internal pressure, as when influted.

The inner tube 2 is provided adjacent its tread portion with a partition 3, which curves outward between its longitudinal edges. A filling 4 is interposed between the partition 3 and the opposingtread portion of the tube 2. This filling isapproximately of crescent formin transverse section, that is, its middle portion is thickened and it tapers uniformly from a middle point toward the outer edges.

The filling 4 consists of .a strip of felt or like fibrous material compressed into the required shape. A protector 5 is embedded centrally within the filling 4 and in outline is of crescent form and consists of a metal strip 6 and a cover 7 enveloping the same.

The metal strip 6 is formed preferably of closely meshed wire fabric and the coverin 7 is ofasbestos or mineral wool. The meta strip 6 is intended to arrest the progress of any object penetratin the shoe and tending to pierce the inner tu e, whereas the covering 7 being of refractory material prevents the heating of the tire by reason of its heat resisting qualities. To further increase the resisting qualities of the tire, both agains the action of heat and of the penetration by sharp ob'ec.ts,tthe protective layer 8 is intel-posed etween the inner tube and the shoe or casing, said protective layer completely envelopin the inner tube and being approximate y of crescent form in transverse section and arranged with its middle or thickest portion adjacent to the tread portion of the tire.

The protective layer 8 is of felt or compressed fibrous material and is provided at a central point with a protecting strip 9 constructed in a manner similar to the-protector 5, that is, it is composed of a metal strip and a covering of asbestos or mineral wool. The protecting strip 9, like the .protector 5 is of crescent form in transverse section. It will be observed that by reason ofthe provision of a multiplicity of layers between the tread surface of tie shoe or casing andthe opposing portion of the inner tube 2, the latter is practically rendered invulnerable because the chances for the same particularly when making a long tour or operating the machine for any great length 0 time. It is further noted that the protective strip 9 is separate from the shoe and the inner tube, hence may be used repeatedly or replaced independently of the parts 1 and 2, thereby enabling repairs to be made at a minimum expense.

Having thus described the invention, What is claimed asnew is:

In a pneumatic tire, an outer split tube of the clencher type having layers of fabric embedded therein and extending around the inner surface thereof, an inner I ibe located Within the outer tube, of smaller external diameter than the internal diameter of the outer tube and therefore spaced therefrom,

said inner tube having double spaced Walls in its tread portion and its sides, which walls merge into each other along the inner circumference of the inner tube and thereby inclose a crescent-shaped space, a crescent-shamed solid filling of felt permanently placed Within said space, contiguous sheets oi wires and asbestos inserted in saidt felt filling and extending across the tread portion of the tire and partially around the side portions of the filling, and a removable, independent, intermediate, protective pad of felt entirely inclosing the inner tube, said pad tapering uniformly from its middle to its edges and being there fore crescent-shaped in section, said, felt pad being provided with an internal heatand puncture-resisting layer embedded therein, consisting of contiguous sheets of asbestos and wire fabric, said protective layer in the felt pad extending' around and inward beyond the protective layer of asbestos and Wire forming the core of the inner tube.

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