US1250223A - Inner tube for elastic vehicle-tires. - Google Patents

Description

E. w. RAWDON. I INNER TUBE FOR ELASTIC VEHICLE TIRES.

APPLICATION FILED FEB. 2, I911- v 1 Patented Dec. 18, 1917.

avwemtoz i UNITED STATES PATENT OFFICE.

EDWARD WQRAWDON, or AKRON, OHIO.

INNER TUBE FOR ELASTIC VEHICLE-TIRES.

To all whom it may concern:

Be it known that I, EDW'ARD W. RAWDON, a citizen of the United States, residing at Akron, in thecounty of Summit and State ofOhio, have invented new and useful Improvements in Inner Tubes for Elastic Vehicle-Tires, of which the following is a specification.

This invention relates to improvements in inflatable inner tubes for double tube pneumatic tires. The object of the invention is to provide an inner tube capable of being inflated for holding the outer shoe or casing of the tire in its expanded position for use.

More particularly the invention consists in the provision of means contained within the inner tube by which the tube may be infiated .while in use by the revolution of the inner tube in unison with the wheel on which the same is positioned, to the end that a tire will always be properly inflated to the required degree by supplying air to the inner tube under pressure by automatically operable means positioned within'the inner tube.

With the foregoing and other objects in view, the invention consists in the novel construction, combination and arrangement of parts constituting the invention to be here inafter specifically described and illustrated in the accompanying drawings which form a part hereof wherein is shown the preferred embodiment of the invention, but it is to be understood that changes, variation and modifications can be resorted to which come within the scope of the matter hereinafter claimed.

In the drawings in which similar reference numerals indicate like parts in the different drawings,

Figure 1 is a longitudinal sectional view of an inner tube embodying the present invention showing the same in its expanded or inoperative position.

Fig. 2 is a view similar to Fig. 1 with the inflating means in its compressed or operative position, and

Fig. 3 is a transverse sectional view taken approximately on line 3 of Fig. 1.

Referring to the drawings in detail reference numeral 1 denotes an inner tube of conventional pattern and as the general construction of the inner tube is unimportant Specification of Letters Patent. t t d 13, 7

Application filed February 2, 1917.

Serial No. 146,114.

to thi invention and as the same is well known, no attempt is made to show the entire tube'but only so much thereof as will show the present invention. within the inner tube and preferably formed integral with the. side walls thereof is a thick elastic or resilient partition or plug 2 preferably provided with concave ends 3 Positioned and 4. The plug or partition 2 completely divides or interrupts the interior chamber or cavity of the tube 1. The partition or plug 2 is formed with a longitudinally-extending recess 5 approximately crescentshaped in longitudinal and transverse section as shown in Figs. 1 and 2 to provide a central portion 6 and tWotapering end portions 7 and 8 the latter terminating approximately near the center of the end wall 4 of the member 2 and establishing open communication with the interior of the main '5. Communicating with the portion 7 of the opening 5 is a duct 11 the lower end of which is in open communication with the portion 7 and which is closed through the medium of a flap valve 12 similar to the valve 10 so arranged as to prevent the egress or passage of air from the recess 5 into the duct 11. The upper end of the duct 11 terminate in an inflating tube 13 of any preferred construction the upper end of which is preferably closed by means of a cap 14 covered by a screen or provided with minute perforations 15. When the inner tube is properly positioned within the outer wear resisting casing or shoe of a pneumatic tire and the wheel on which the tire is mounted is revolved the weight of the wheel and the car acts to move the walls of the recess 5 toward each other thereby forcing the air contained therein outwardly past the valve 10 into the chamber or cavity of the inner tube for assisting in maintaining a proper degree of inflation therein and the egress or the passage of air outwardly from the recess 5 through the duct 11 is prevented by the valve 12. This pumping action or eX- pulsion of air from the reces 5 into the cavity of the inner tube takes place whenever the portion of the tire containing the partition or plug 2 is at the lower point of its cycle or revolution and is in contact with the roadway. WVhen the portion of the tire containing the member 2 moves upwardly from its operative position in contact with the roadway, the weight of the wheel and the car is removed from the partition 2 and the side walls of the recess 5 are permitted to separate or move apartinto the position shown in Fig. 1. During the movement of the walls of the recess 5 to their open or expanded position a sucking or exhaust action takes place which closes the valve 10 and opens the valve 11 allowing a fresh charge of air to pass through the duct 11 into the rece s. 5 and the action is repeated every time the portion of the tire containing the member 2 i at the lower portion of its cycle of movement. When the proper pressure or degree of inflation of the tube 1 has been reached, the air in the inner tube forces the end walls 3 and 4: of the member 2 toward each other and moves the walls of the recess into substantial contact and thus substantially closes or obliterates the recess 5 and also moves both valves 10 and 11 to their closed positions which remain in these positions until the pressure of air in the cavity of the inner tube has been reduced suiticiently to permit the pumping action of the walls of the recess 5 to resume their function of forcing air into the inner tube. The screen or minute perforations 1 5 of the cap 14; serve to prevent the entrance of dirt and other foreign matters to the interior of the recess 5,

I claim:

1. An inner tube embodying a body portion, a block formed integral therewith and constituting a relatively long partition extending completely across the chamber of the tube, said partition provided with a longitudinal recess crescent-shaped in central cross and longitudinal radial sections, one end of said recess having direct connection with the chamber of said tube, the other end of the recess communicating with the atmosphere, the said recess during the compression of the tube substantially completely closing from the air receiving end thereof toward the discharge end into the chamber of said inner tube.

2. An inner tube including a body por tion, a relatively long, solid block extending oss the Q mhsr thereof o pr d a pa tition, said partition provided with a recess ending long tu nally h re d O nth iled i both ross and ongitudina nt al, ad a (se tion, a d re e c mmunieating directly one of its ends with the amber f the ub t e pp it n f id reces comm cating h h m phra-e the partition being formed of rubber capable of compression whereby the opposite end walls of the block are moved into close relationship with a substantially complete clo of the recess from one end toward the other when the tube has obe t desir d infl ti ny n e tim y wh eo ha hereunte Se my hand.

EDWARD w, RAWDON.

Copies of this patent may be obtained for five cents each, byv addressing: the Commissioner of Eatents,

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