US1315173A - Automatic pressure-relief valve for pneumatic tires - Google Patents

Description

L. M. WAMPLER.

AUTOMATIC PRESSURE RELIEF VALVE FOR PNEUMATIC TIRES.

JIFFL-J- THE COLUMBIA PLANnc ml APPLICATION FILED "AR. 3. I9l9.

Patented Sept. 2, 1919.

I j/zggal r I moi/Mega u an" WASHINGTON, I). r.

LUTHER MARION WAMPLER, OF LIBERAL, KANSAS.

AUTOMATIC PRESSURE-RELIEF VALVE FOR PNEUMATIC TIRES.

Application filed March 3, 1919.

To all whom it may concern:

Be it known that I, LUTHER M. WAM- PLER, citizen of the United States, residing at Liberal, in the county of Seward and State of Kansas, have invented certain new and useful Improvements in Automatic Pressure Relief Valves for Pneumatic Tires; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to valves, and it relates more specifically to an improved automatic pressure-relief valve for pneumatic tires.

One object of this invention is to generally improve upon devices of this character by constructing this device of comparatively few and simple parts, consistent with practicability, efficiency and durability.

A further object is to provide an improved valve which will efiectually prevent accidental and continual leakage, whilebeing quite sensitive in yielding'to an over-pressure, so as to permit the escape of air for relieving such over-pressure.

Other objects and advantages may become apparent to persons who read the following details of description in connection with the accompanying drawings, in which Figure 1 is a view of my improved valve partly in elevation and partly in vertical section;

Fig. 2 is a horizontal sectional view along line 2--2 of Fig. 1;

Fig. 3 is a perspective view illustrating my improved complemental valve rings or disks.

Referring to these drawings in detail, in which similar reference characters correspond with similar parts throughout the several views, the lower end portion 5 and its connection with the inner tube 6, as well shown in connection with my improved as the rib 7 and felly 8, may be of any appropriate construction, and are merely valve for the purpose of showing the relation of the valve to such elements.

My improved valve comprises an integral body 9 of tubular shape, the same having a central bore or opening 10 extending longitudinally therethrough from end to end- A cap 11 is screw-threaded over the outer end of the body 9, and this body may be fitted air-tight on the screw-threaded portion 12,

Specification of Letters Patent.

Patented Sept. 2, 1919.

Serial No. 280,219.

although any appropriate form of valve structure (not shown) may be operable within the outer or upper end portion in any well known manner for allowing the entrance of air therethrough into the tube 6, but preventing the exit of air therethrough. The body 9 also comprises a valve stem 13 and an annular shelf or valve seat 14, the latter surrounding the base of the valve stem and being provided with any appro priate number of air passages communicatlng with the exterior of the body through the annular shelf 14 and also communicating with the interior of the .body 9, that is, they communicate with the opening 10, which extends through the body 9 from end to end. It will be seen that the air passages 15 extend downwardly and inwardly from the shelf 14, so that when a current of air 'is being forced down through the air passage 10, there is little, (if any) tendency of the air to pass outward through the air passages 15.

Upon the shelf 14 is secured a fiat resilient rubber ring 16, the same being centrally apertured at 17 and eccentrically apertured at 18. This ring 16 is seated and preferably cemented upon the shelf 14 in such relation that the valve stem 13 extends through its central aperture while the air passages 15 are in registry with its apertures 18, respectively. It will be seen, therefore, that no air can pass from the air passages 15 exce t through the apertures 18.

A flat resi ient rubber ring or disk 19 is movably seated upon the ring 16, and this ring 19 is provided with a central aperture 20 and with eccentrically positioned studs or bosses 21 which are of a size and shape to fit tightly in the aperture 18 and render the latter air-tight. A flat metal ring 22 is seated on the rubber ring 19 and constittutes a spring seat against which a helical spring 23 presses with suflicient force to counteract the normal outward pressure of air in the tire and valve. However, in the event that the air in the tire or tube 6 expands because of excessive heat or any other cause, and such expansion causes the air pressure to exceed a predetermined normal,

the valve member or rubber ring 19 upon the rubber ring 16.

In order that the predetermined normal pressure may be varied, I provide screw threads 24 at the outer end portion of the valve stem, and engage an adjusting nut 25 therewith, and I may employ a washer 26 between the spring 23 and nut 25. It is obvious that by screwing the nut 25 downward, the downward pressure of the spring 13 on the valve member 19 is increased, so that a greater pressure of air will be required to raise this valve member.

In order that the device may be protected from dust, mud, rain, etc, I provide a hood 27 which is secured by screw-threads to the enlarged lower portion of the body 9, and this hood is provided with an opening or air outlet 28 which is normally covered by means of a flat spring 29. Therefore, when air escapes through the apertures 18 into the hood, it may escape from the hood through the opening 28 by its pressure slightly raising the spring 29.

Although I have described this embodiment of my invention very specifically, it is to be understood that this invention is not limited to these exact details of construction and arrangements of parts, and that I am entitled to make changes within the scope of the inventive idea disclosed in the foregoing description and following claim.

'What I claim as my invention is:

In a device of the character described, a tubular bodycomprising a valve-stem and an annular valve-seat around one end of the valve stem, said valve-stem being normally closed but adapted to be opened to permit air to be forced through said body, said body being provided with air-passages communicating with its interior and with its exterior through said valve-seat; an apertured rubber ring around said valve-stem and seated on said valve-seat in air-tight relation to the latter except that its apertures register with the said airepassages; a rubber ring formed with bosses and being normally seated on the first said rubber ring and having its bosses fitted in the apertures of the first said rubber ring; and yieldable means to normally press the second said ring upon the first said ring so that the apertures of the first said rubber ring are closed by the bosses of the second said rubber ring and are adapted to be opened by excessive pressure of air in said air-passages.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

LUTHER MARION WAMPLER.

Witnesses J. E. FITZGERALD, Jon T; DU RAIN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D; G.

Images