US1464230A - Combined eadiator cap and belief valve foe automobiles - Google Patents

Description

Aug. 7, 1923. 1,464,230

A. R. WIGHTMAN COMBINED RADIATOR GAP AND RELIEF VALVE FOR AUTOMOBILES Filed June '5. 1922 25 19 15 w 7 14: a2 22 16 Z3 17 f Patented Aug. 7, 1923.

UNITED STATES ANDREW R. WIGHTMAN, 0F MALDEN, MASSACHUSETTS.

COMBINED RADIATOR CAP AND BELIEF VALVE FOR AI TTOMOBILES.

Application filed June 5, 1922. Serial No. 566,058.

To all whom it may concern.

Be it known that 1, A DREW R. NIGHT- MAN, a citizen of the United States of America, and a resident of Malden, in the county of Middlesex and Commonwealth of Massachusetts, have invented certain new and use ful Improvements in Combined Radiator Caps and Relief Valves for Automobiles, of which the following is a specification.

This invention relates to a combined radiator cap and relief valve for automobiles and particularly to a form of valve that is very conveniently located in the removable cap or closure of the radiator.

An object of the invention is to produce a radiator cap having mounted therein a simple and cheap valve adapted to automatically function to relieve pressure in the radiator, due to the formation of steam therein, occasioned by lack of water or the poor circulation thereof.

It is a common occurrence in water cooled motors to overheat the water to such extent that steam is generated in the radiator. This sometimes happens even when there is sufficient water in the radiator when the motor has been run for a long period at high speed. More often steam generation is caused by an insufiicient supply of water or poor or non circulation thereof.

In any event the formation of steam, and consequently pressure in theradiator is not desired and in fact in some instances acts detrimentally to the proper circulation of the water.

It is an object of the present invention to provide automatic means to relieve the radiator of pressure so formed by supplying a simple relief the use of which obviates the use of the well known overflow or vent pipe. Heretofore the overflow pipe has been considered a necessary adjunct to a radiator and while simple in itself it is subject to clog ging and leakage and has not the capacity to relieve pressure the required amount for the best results.

The present invention consists in certain features of construction. arrangement and combination of parts which will be fully understood from a description of the drawings and the claim hereinafter given.

0f the drawings:

Figure 1. represents a side view of the improved valve contained cap applied for use. Figure 2 a section on the line 22 Figure 1. Like characters represent like parts in the drawings.

The drawings herewith show one form of radiator cap conveniently arranged to receive therein a pressure relief valve suitable for the occasion. It will be understood that the size and shape thereof may be as desired so long as provision is made to receive therein a valve adapted to automatically function upon the generation of pressure in the radiator. The radiator indicated at 10 has the usual screw threaded nipple 11 to receive the cap 12 which in this instance has the dome like portion 13 hollowed to form a chamber 14 having the perforations 15 and the hand bar 16.

A partition 17 is formed in the cap having a threaded hole into which a centrally bored screw plug 18 is inserted which forms a seat for the valve about to be described.

The dome 13 is provided with an opening at the top thereof through which the threaded end of a stud 19 is passed and held by an ornamental nut 20. The said stud is cen' trally bored as at 21 to slidingly receive the stem 22 of a valve member 23 which is provided with. a resilient closure device 24 adapted to find a seat on the plug 18. Normally the valve is held in closed position by a spring 25 acting on the adjusting screw 26 through a washer 27, turning the said screw in one direction or the other increases or decreases the tension of said spring by which means the valve may be adjusted to automatically lift upon a predetermined pressure in the radiator.

It will also be understood that if desired the screw plug 18 may be adjusted toward or from the valve to increase or decrease spring tension for the same purpose. Normally the valve assumes the position shown in Figure 2 but upon the generation of a predetermined or sufficient amount of pressure in the radiator, the valve will be forced upwardly from its seat against the action of the spring and the valve lifting agent will find its way to the atmosphere through the holes 15, and if it is steam or vapor a visual signal or warning is immediately set up.

It is not known that an adjustable pressure relief valve has ever been mounted in an automobile radiator cap and therefore it i is not the intention to limit the invention to the precise construction herein shown as it is obvious that slight changes might be made Without departing from its spirit and scope.

Having described the invention I claim:

In a combined radiator cap and relief valve for automobiles, a body portion having a partition therein to form a closure for said radiator; a centrally bored screw plug adapted to form a seat for a valve; a valve having a stem; a centrally bored stud fast 10 with said body portion in which said stem is guided; a spring in the bore of said stud; and a screw carried by said valve adapted to regulate the tension of said spring.

Signed by me at Malden, Mass, this 2nd 15 day of June 1922.

ANDRElV R. VVIGHTMAN.

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