US2242788A - Safety inner tube - Google Patents

Description

May 20, 1941. A. MARKS SAFETY INNER TUBE Filed Nov. 14, 1939 141125501 Mir/( V VEN TOR.

A TTORNEYS.

i atented May 20, [941 2,242,788 SAFETY INNER ITUBE, Anthony Marks, Youngstown, Ohio Application November 14, 1939, Serial No. $414,339

2 Claims.

This invention relates to a safety inner tube.

The principal object of this invention is the provision of an inner tube adapted to support a pneumatic tire while both inflated and deflated and particularly at such times as the tire casing itself is ruptured or blown out.

A further object of the invention is the provision of an inner tube comprising dual air chambers adapted to be inflated through individual means and which air chambers normally support the weight of the vehicle upon the tire within which the inner tube is positioned.

A further object of the invention is the provision of an inner tube comprising dual air chambers positioned above and below a cushioning section of suitable resilient material.

Specifically, the safety inner tube shown and described herein has been designed so as to provide an inner tube which in normal inflated condition possesses exactly the same characteristics ;as the conventional inner tubes now commonly in use but which actually takes the form of a yieldable cushion suspended between an outer .and inner inflatable section.

With the foregoing 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 changes in the precise em- ;bodiment of the invention herein disclosed, can be made within the scope of what is claimed without departing from the spirit of the invention.

The invention is illustrated in the accompanying drawing, wherein:

Figure 1 is a cross sectional elevation of a tire casing showing a cross sectional View of the safety inner tube positioned therein.

Figure 2 is a cross sectional side elevation of a section of the safety inner tube shown in Figure 1.

It is well known that many and various attempts of providing a blowout proof inner tube have been made, the most successful heretofore of which have comprised the tube within a tube structure commonly referred to as a blowout proof inner tube. One of the objections to this type of tube is the loosening of the innermost tube from its annular connection with the inner tube itself which frequently results in the rupture of the complete tube thus rendering it useless. Another objection is in the difficulty of inflating the tube within a tube structure to proper pressure as the equalizing opening in the innermost tube is of such small size that quite commonly the tube is only partially inflated at the time of inflation due to the inability of a sufficient quantity of air reaching the interior of the innermost tube through the small opening. Another objection to this type of tube is that when the tube itself is ruptured as in the case of a blowout the weight of the vehicle upon which it is positioned is carried for a short time upon the innermost tube which rapidly deflates through the opening provided therein. In order to overcome these objections the safety inner tube shown and described herein has been designed and comprises an annular tubular structure I0 which has positioned midway therein an annular cushion ll of resilient material or light weight sponge rubber possessed of sufl'icient body to adequately support the weight of the vehicleupon which it is to be used. This annular cushion II is shaped so that an outer inflatable section I2 is provided which, of course, completely encircles the annular cushion H and supports the tread portion E3 of a tire casing M as it is positioned between this tread section I3 and the annular cushion H, Positioned around the innermost portion of the tubular structure It] there is a secondary inflatable section l5 which gives the safety inner tube flexibility and enables its accurate and positive positioning in the tire casing l4 upon a drop center wheel It.

By referring to Figure 2 of the drawing it will .be seen that the outer and inner inflatable sections l2 and I5 are provided with individual valved inflation tubes I1 and l8 respectively which are preferably formed of flexible material it being obvious that in order to be practical the innermost portion [1A of the inflation tube I! is formed of yieldable material preferably a rubber tube so that when the complete tube is inflated or deflated the changes in the relative positions of the various portions thereof will not affect the utility of the inflation tube ii. The inflation tubes I1 and iii are positioned adjacent each other so that they may conveniently pass through the single opening provided in most wheel structures and are formed of flexible material so that they may be separated sufficiently to permit the application of inflation fitting to their respective valved ends. It will also be seen by referring to Figures 1 and 2 that the plurality of finger like depressions l9 may be formed in the annular cushion It in order to reduce the weight thereof and to provide an additional cushioning effect. It is obvious that these finger like depressions may be formed entirely separate from the inflatable sections l2 and IE or that they may communicate with either section as desired.

What I claim is:

1. An inflatable container adapted to be inserted in and removed from a tire casing as a unit comprising a flexible annular cushion arranged within a flexible annular tube of greater cross section, said cushion being joined to the said tube along its sides throughout its entireperiphery so as to form inflatable sections above and below the said cushion, the said inflatable sections formed by the said flexible annular tube, together with means for inflating each of the said inflatable sections separately.

serted in and removed from a tire casing as a unit comprising a flexible annular tube of relatively thin material having arranged therein an annular cushion member of relatively thick material, the said cushion member being joined along its respective sides to the said flexible annular tube so as to be spaced midway between a the inner and outer peripheries thereof so as to 2. An inflatable container adapted to be in-V 15 form separate and distinct inflatable annular chambers one adjacent the outermost periphery of the flexible tube and one adjacent the innermost periphery thereof, together with separate means for inflating the said sections.

ANTHONY MARKS.

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