USRE17461E - Pany inc - Google Patents

Description

Oct. 15,` 1929.

A. H. SHOEMAKER- PNEUMATICI TIRE AND RIM CONSTRUCTION Original Filed March 30, 1920 ATTORNEY Reissued Oct. 15, 1929 UNITED STATES PATENT OFFICE ALVIN H. SITOEMAKER, OEy SEATTLE, WASHINGTON, ASSIGNOR TO SEMITIRE COM- PANY INC., OF SEATTLE, WASHINGTON, A CORPORATION OF WASHINGTON PNEUMATICI TIRE AND EIM CONSTRUCTION Original No. 1,510,709, dated October 7, 1924, Serial No. 369,960, filed March 3G, 1920. Application for reissue filed July 15, 1926. Serial No. 122,703,

specific rim disclosed herein is used said rim y on which the tire or tread is placed being eX- `tended to. take the place of the usual side walls of the tire.

Another object is to provide a tire and riin structure in which the bead of the tire fits over the outside of the bead receiving portion of the rim and one that is constructed in such a manner that the expansive pressure of the air within the tire will cause the bead of the tire to be drawn tightly into contact with theA bead receiving portion of the rim.

A further object is to provide a pneumatic tire and rim construction embodying a tire that may be readily placed on a one piece circular rim.

A still further object is to provide a tire that is cheap to construct, that is durable and Wears well, and one that is Apossessed of the resilient properties required of a pneumatic tire.

A. still further object of the invention is to provide a pneumatic tire of elastic material having transversely directed cordsI imbedded therein to provide extensibility in longitudinal directions only. f

With the above and other objects in view the invention consists in the novel construction, adaptation and combination of parts of a tire and rim construction as will be more clearly hereinafter described and claimed.

In the accompanying drawings Fig. 1 is a View in cross section on a relatively large scale of a tire and rim constructed in accordance with this invention; and

Fig. 2 isa view in side elevation on a reduced scale of such tire and rim, certain parts being;V broken away to better reveal the internal construction of the same.

Like reference numerals designate like parts throughout the several views.

Referring to the drawings the numeral 5 designates a circular rim that is adapted to be secured in any suitable manner to a wheel not shown.

The rim 5 is of substantially semicircular cross sectional shape as shown in Fig. 1 and the annular edgesof the rim are bent inwardly by a relatively sharp bend as at 6 and terminate in curved portions 7 that are adapted to receive the overlapping bead portions 8 of a tire 10.

The tire 10 is provided with circular bead rings or cables 11 and has cords 12 that are embedded therein and preferably extend crosswise of the tire and at substantially right angles to the plane of such tire.

The cords 12 are preferably a single cable that is wrapped back and forth around the bead rings as shown in Fig. 1 as the tire is built up and become a part of the tire when the same is cured. Said cords extend directly across from one bead toy the other, and there are no longitudinally or diagonally directed cords or fabric that will tend to restrict the tire'from longitudinal extension.

1 An air tight inner tube 13 of the usual form may be disposed within the rim 5 and 7 as shown and may be provided with a valve 14:.

The tire 10, as shown, is designed specilieally to be mounted upon said specic type of rien-and is without side walls. Said tire is similar to the tread portion of an ordinary pneumatic tire that has its side walls removed` and has the bead rings l1 incorporated therein. i

The outer peripheral wailof the tire is substantially a semi-circle as seen in cross section in Fig. 1 with the center of curvature at A while the inner peripheral wall ,is arcuate shape 4and considerably less than a semicircle with the center of curvature at B so that the tire is relatively thicksand heavy in the center and tapers toward the edges,

The cords 12 are embedded within the tire at a substantially constant distance from the inner wall of such tire so that as seen in Fi l their Center of curvature is the point B. he rim 5 is preferably circular with a center of curvature ataA. and the tire which is lo drawn across t-he open periphery of the rim forms a somewhat flattened side for the semicircular air chamber within the rim.-

The bead rings 11 are endless circular me tallic cables which are practically .rigid or 15 will expand only a very slightamount when the tireA is placed on the rim, as shown, and is iniiated. The pressure of the air which is equal in all directions will tend to expand the tire radially and will further tend to crowd outwardly orv swell that portion of the tire between the two bead rings l1 thus causing the bead' portions 8 of the tire to be drawn inwardly tightly against the curved bead receiving portions 7 of the rim, thereby pre- 26 v enting any danger'of a blow out between the t1re and rim. y

When the bead portions 8 are in engagement with the bead receiving portions 7 of the rim thecords 12, which form nonelastic 30 transverse binders, are drawnacross the open .outer portion of the rim on anarc having a center at B so that the nonelasticI binders extending from bead tobead traverse considerably less than half of a complete circle described from the center B. The expansive pressure of the air within the tire and rim will tend to cause the non-elastic binder cords 12 to approach an exact semi-circular shape, and, owing to theV fact that the ends of such cords are held by the non-elastic bead rings 11, this pressure will tend to draw the bead portions of the tire tightly inward against the bead receiving portions of the rim.

crowding one side of the rim into the tire far enough so that the opposite side of the tire may be slipped over the rim and then adjusting the tire all around so vthat the'bead portions 8 of the'tire t the curved beadreofceiving portions ofthe rim. y

When the tire is in use thetread portion thereof iiexes and absorbs shock like the tread portion of an ordinary pneumatic tire, such tread portion being supported by and deriving its resilience from the relatively large volume of compressed air most of which is contained within the rim 5.

In this tire. when used upon the specially formed rim described the side walls common to pneumatic tires are dispensed with and only a part that corresponds with and is Vsimilar to the tread portion of an ordinary tire is used, thus making a tire of this form relatively` cheap in construction.

From the foregoing description taken in .transverse binder but leaving said tire free but, while I have described the principle of v operation of the invention, together .with the deviceA which I now consider to ne the best embodiment thereof, it will be understood lthat the structure shown is merely illustrative and that such changes may be made as are within the scope of the following claims.

What I claim is: l 1. A tire and rim construction of the class described embodying arigid rivm having external bead receiving portions, and a tire of pliable material having non-elastic bead rings in the edges thereof and having reinforcing means extending between said bead rings and forming a substantially non-elastic transverse binder but leaving said tire-free to expandV circumferentially except for said 35 bead rings, said transverse binder, as considered on any transverse section of the tire, be-r ing short enough so that, when the tire is in# flated, it will form bet-Ween said bead portions an arc of less'than a semi-circle thereby causingrsaid bead portions to be drawn in- -wardly against the rim. f

2. In a tire and rim construction embody. ing a tire of elastic material having nonelastic bead rings in the edges thereof, reinforcing cords extending crosswise between said bead rings and forming a substantially to expand longitudinally between said bead rings and arecessedrim having bead receiving portions arrangedto fit within the bead Yportions of said tire and hold said bead portions apart, whereby when the tire is inflated, said cords will form, between said bead bead portions of thetire will be drawn in against the bead receiving portions of the rim. The tire may be placed on the rim by 3. A tire and rim construction of the class described, embodying a rim having ,spaced apart bead receiving portions, and a tire of pliable elastic materlaljhaving non-elastic bead portions arranged to rest on said bead receiving portions ofv said rim and having reinforcing means imbedded therein and extending between said bead portions and forming ka substantially non-elastic transverse binder, b'ut leaving said tire free to stretch circumferentially except for said non-elastic bead portions, said tire being` substantially less than a circle in cross section when said l bead portions rest onvsaid bead receivingl portionsof said rim, and said tire and said rim co-operating to form an air cavity. s

4. AV tire and rim construction of the class described, embodying a rigid concave rim having spaced apart inclined bead receiving portions, and a tire of substantially semicircular cross section formed of pliable elastic material having non-elastic bead portions arrings, arcs of lessthan a semi-circle and the los ranged to be tightened cireumferentially by internal air pressure on said bead receiving portions of said rim and having reinforcing means imbedded therein and extending between said bead ortions and, forming a suhstantially nnon-e astio transverse binder, but

' leaving said tire'free to stretch circumferi" entially except for said non-elastic bead por.

tions. a Signed at Seattle, Washington, this 16th day of June, 1926. .ALVIN H. SHOEMAKER.

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