Air-regulating attachment for carburetors



April 14, 1925. 1,533,980 W. FALWELL AIR REGULATING ATTACHMENT FOR CARBURETORS Filed Nov. 5 1923 Patented Apr. 14, 1925. V UNITED STATES PATENT OFFICE. WRAY FALWELL, OF FITCHBURG, MASSACHUSETTS, ASSIGNQR ZED EMERSON W. BAKE-1B,, OF FITOHBUKG', MASSACHUSETTS. AIR-BEGULA'I'ING ATTACHMENT FOR GARBURETOES. Applicat on filed November To all 207mm it may concern: Be it known that I, Year FALWELL, a citizen of the United States. residing at Fitchburg, in the county of .Vorcester and Commonwealth of Massachusetts, have invented a new and useful. Improvement inregulating attachment for carburetors, and p is designed for use especially with those types of carburetors which are devoid of air control devices, i. e., carburetors such as are in general use on Ford cars and many other motor vehicles. 1 i The present invention contemplates an air control device which can be operatively associated with such a carburetor with the greatest ease and facility, and with no necessity for the use of special fittings or any attaching device whatsoever. The invention also contemplates a device of this class which, by its construction, absolutely insures against the possibility of error in its positioning, and which, by its construction, furthermore is not subject to damage or breakage in the event of back-firing by the engine. The above and other objects are obtained by the novel construction hereinafter described and claimed, reference being had to the accompanying drawings, wherein- Fig. 1 is a side elevation, partly in section, showing my improved device in operative association with a carburetor of the type used on Ford and other engines. Fig. 2 is an enlarged View in side elevation of said device or attachment. Fig. 3 is a developed view of the blank from which said device is preferably made. Fig. 4 is a vertical sectional view on the line 4-4 of Fig. 2. Fig. 5 is a top plan view of mydevice or attachment. 7 Like reference characters refer to like parts in the different figures. Referring first to Fig. 1, the carburetor 1, of ordinary and well known construction, is shown in connection with the inlet manifold 2 of an internal combustion engine, and the air supply for said carburetor is shown as being delivered thereto by means of a pipe 3, the latter having its entrance 4 flared to extend over a portion of the exhaust manifold 5, so that the air supply is suitably heated before delivery to the carburetor. The hot air pipe'or fitting 3 is here shown as of the type that is universally used with carburetors of Ford engines, there being a right angle bend in said pipe, as indicated at 6, Fig. l, which is advantageously utilized in my invention, as hereinafter clescribed. p r The attachment which forms the subject matter of my invention ispreferably made from a sheet metal blank or stamping of the form indicated in Fig. 3, the same compris-' ing an annular portion 7 having four projecting radial wings 8, 8, with a connected tongue 9 extending from each of said wings. Two of said wings 8, 8, lying oppositely to each other, are bent or pressed upwardly, and the other two are bent or pressed downwardly, all of said wings in this operation being curved so as to constitute arcs of a cylinder whose outside diameter corresponds substantially to the inside diameter of the pipe 3. With the wings thus bent and curved, the blank of Fig. 3 assumes the form of a skeleton cylinder, as'shown in Fig. 2, the annular portion 7 constituting a transverse dividing partition in said cylinder,'and the wings 8, 8 constituting the cylinder walls proper, as will be readily understood. The tongues 9, 9 of said wings are bent over toward each other at right angles, and the apertures 10, 10 of their overlapping portions thus come into registry to provide bearings for a spindle 11, whose ends, after insertion of said spindle, are upset or enlarged to prevent endwise displacement thereof. The spindle 11 carries a circular valve member 12 which is free to slide longitudinally on said spindle, and which normally is maintained midway of the skeleton cylindrical casing, in the opening 13 of trans verse partition 7, by springs 14, 14 on opposite sides thereof, encircling said spindle and confined between said valve and the tongues 9, 9 at either end. The opening 13 is of greater diameter than valve 12 and hence, even in this centered position of the valve, there is always an annular passage between it and the inner periphery of the partition; as hereinafter described, the area of this passage varies with the suctionproduced by the engine, when the attachment is operatively associated with the carburetor. Such operative association is accomplished simply by removing the usual hot air pipe or fitting 3, and by inserting the attachment into the flared entrance 4:, whence it drops to the bottom of the vertical leg of said pipe, coming to rest at the right angled bend 6. Thereupon, the pipe or fitting 3, with the attachment of my invention inserted therein, is replaced on the engine, in the usual relation to the carburetor. Y No special fittings or attaching devices of any kind whatsoever are required, since the attachment, once inserted, seeks and retains its proper position by the action of gravity alone. Moreover, it is impossible to get the attachment inserted in any but the correct way, since the valve mechanism is double-acting, and the springs work in the same way from both sides thereof. With the attachment in place, the amount of heated air supplied to the car buretor is automatically regulated by the suction, and by the use ot'the device the motor vehicle can be throttled down to a very slow speed on high gear and it has also been found that the vehicle when using this device can be started easier in cold weather and can be more readily accelerated otherwise. Amaterial saving of fuel is also efi'ected. As the suction increases, the valve 12 is automatically shifted and, by moving away from the partition 7, increases the opening for the passage of air to the carburetor. In the event of the engine back-firing, no damage or breakage can occur, since the pressure operating on the valve is cushioned by the outer spring 14. I claim- 1. As a new article of manufacture, an air regulating attachment for a carburetor, comprising a double-acting yielding check member offering the same resistance to air in either direction insertible either end foremost in a vertical leg of the hot-air supply tube leading to said carburetor. 2. As a new article of manufacture, an air regulating attachment for a carburetor, comprising a casing of skeleton cylindrical formproviding a central partition and made from a single stamping, the latter having oppositely bent wings, with inturned tongues on'said wings to providebearings at each end of said casing for a spindle runnin longitudinally of said casing, and sai spindle having thereon, in the vicinity of said partition, a slidable valve member subject to spring pressure on both sides. WRAY EALWELL-



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