US784738A - Pneumatic tire. - Google Patents

Description

I PATENTED MAR. 14, 1905.

T. GIARA. PNEUMATIC TIRE.

APPLICATION FILED APE.19.1904.

Patented March 14, 1905.

TULLIO GIARA, OF BOSTON, MASSACHUSETTS.

PNEUMATIC TIRE.

SPECIFICATION or i g P Of Letters Patent N o. 7 84,7 38, dated March 14, 1905.

Application filed April 19, 1904. Serial No. 203,908.

To (all whom it may concern."

Be it known that I. TULLIO GIARA, a subjeet of the King of Italy, and a resident of Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improy ements in Pneumatic Tires, of which the following is a specification.

My invention relates to improvements in pneumatic tires, and especially to a protective shield which has for its object to prevent the air-chamber from being punctured by nails or like articles which may cut through the outer tube surrounding the inner tube which forms the air-chamber.

In carrying out this invention'the protective shield is placed inside the tire between the inner and-outer tubes.

My invention consists of certain novel features hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, which illustrate a construction embodying my invention,

- Figure l is a vertical section of a cycle-rim with a tire constructed accordingto my invention. Fig. 2 is a detail plan view, partly in section, of the improved protective shield.

Fig. 3 is a longitudinal sectional'view through the protective shield. Fig. I is a vertical cross-section on the line X X, Fig. 2, through the protective shield.

Like letters of reference refer to like parts throughout the several views.

On the rim A is located the inner tube O, constituting the air chamber, and held in place on the rim by the tube B, asshown, or in any other desired manner. Located over the inner tube is a layer D, of prepared cloth, and between said layer of cloth and the outer tube B is located the protective shield, which consists of compressed layers Gr and H, of cotton, which have been previously subjected to the action of a suitable solution to give them the proper binding property, and, if desired, to the action of an oxid to cause them to retain their flexibility. The layer G is turned in at the edges, as shown in Fig. 2, and its opposite layer H is formed with a series of pockets J in the manner indicated in Fig. 3, and in these pockets are located flexible thin overlapping steel plates K in the form of scales. Against the back of the layer H is a piece of gummed cloth L. These three layers of cloth are in-.

closed by sheets of rubber F F or directlyvulcanized rubber, and all the parts are then fixed together to hold each part in a determined position, so that the parts cannot shift after the shield has been placed in position between the outer and the inner tube. These thin flexible steel plates give elasticity to the tire in contradistinction to rigid sheets of metal, which reduce the elasticity of the tire. As shown, the shield E is thinner at its edges than at the middle and curved in accordance with the inner tube O forming the air-chainber and of such size as to cause a nail or other cutting-surface which may pierce the tirecover to come into contact with the flexible metal plates and prevent puncture of the airchamber. It will be understood that the shield being light and flexible will yield to any cutting-surface which pierces the outer tube and compresses the air-chamber it surrounds, the fibers and the thin metal plates preventing the cutting-surface from passing through the inner tube and puncturing the airchamber.

The rubber sheets F F prevent the entrance of water to the steel plates K, thereby preventing oxidation of said steel plates, which would cause them to break. After a nail or other sharp surface has passed through the outer tube and has come into contact with the shield and has been withdrawn the rubber of the shield closes up and prevents entrance of water to the steel plates.

I do not limit myself to the arrangement and construction shown, as the same may be varied without departing from the spirit of my invention.

In practice it may be desirable to cement the protective shield to the inside of the tube, so that when the parts are assembled the shield will remain in its proper position.

Having thus described the nature of my invention and set forth a construction embodying the same, what I claim as new, and desire to secure by Letters Patent of the United States, is-

1. A protecting-shield for tires consisting of layers of textile material treated with a binding substance to stick them together and with a flexibility-retaining substance, metal plates inel'osed by said layers of textile material, and a rubber covering inelosing said layers of textile material.

2. A protecting-shield for tires consisting of layers of textile material treated with a binding substance to stick them together and with a flexibility-retaining substance, overlapping metal plates inclosed by said layers of textile material, and a rubber covering inclosing said layers of textile material.

3. A protecting-shield for tires consisting of layers of textile material treated with a binding substance to stick them together, overlapping metal plates inclosed by said layers of textile material, and a rubber covering inclosing said layers of textile material.

TULLIO GIARA.

itnesses:

A. L. MEssEo, A. R. LARRABEE.

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