US1802135A - Carburetor - Google Patents

Description

A ril-21, 1931. w, c CARTE 1,802,135

I CARBURETOR Filed July 15, 1927 fi z/lg. Z

gym W 197 TOR/V5745.

Patented Apr. 21, 1931 PATENT OFFICE VIILLIAM C. CARTER, F FLINT, MICHIGAN,

CARBURETOR Application filed July 15, 1927. Serial No. 206,027.

This invention relates to carburetors. The main object of the invention is to provide a carburetor that'is equipped with a float mechanism which is compact, inexpensive to manufacture and easy toassemblep Another object is to provide acarburetor, which is of such design that a one-piece symmetrical,'cup-shaped member, produced by a spinning, drawing or stampin operation, and free from slots or external projections, can be used to form the float bowl. 7

Other objects and desirable features of my invention will be hereinafter-pointed out.

Figure 1 of the drawings is a vertical, longitudinal sectional view of a carburetor constructed in accordance with my invention.

Figure 2 is a horizontal sectional View of the needle valve, taken on the line 2-2 of Figure 1; and Figure 3 is a perspective view, showing fragmentary portions of the needle valve and its actuating lever disassembled, so as to more clearly illustrate the pivotal connection between said parts. 5

Referring to the drawings whichillustrate the preferred form of my invention, A

designates the body casting of the carburetor,

B designates an air chamber in said body casting, C designates the main passageway" of the carburetor which communicates with said air chamber, and Ddesignates a throttle valve in said main passageway. The body casting A is provided with a depending, cylindrical portion E and the float bowl of the carburetor isformed by a one-piece symmetrical, cup-shaped member F arranged in concentric relation with the'depending por-:

tion E on thebody casting and with its top ed e pressed tightly against? a gasket that is seated in an annular groove on the under- 40 side of said body 'casting,'the bottom of said cup-shaped member being integrally connected to its side wall. The float bowl F can be retained in position in various ways without departing from the spirit of my invention, but is herein illustrated as being held in po sition by a cap screw G that is'screwed into.

a plug H which serves as aclosure for the lower end of a bore in the portion E of the body casting that constitutes an accelerating well w.

The needle valve I which governs the admission of the liquid fuel to the float bowl is preferably provided with a shank of triangular shape in cross section, as shown inFigure-2,'and is reciprocatingly mounted ina cylindrical hole thatv leads into a lever passageway or chamber J formed in the body casting A and disposed so that one end of same is in communication with the interior of the float bowl. The needle valve I is actuated by a lever K and a float L in the float bowl that bears against one end of said lever, and said needle valve and lever are pivotally connected together by a novel means which permits said parts to be manufacturedcheap ly and to be assembled or disassembled quickly and easily, the'said means consisting of a substantially hook-shaped portion on the needle valve arranged in pivotal engagement with a part on the actuatinglever disposed so as to prevent the needle valve from turning or rotating relatively to the lever. In the form of my invention herein illustrated, note particularly Figure 3. The needle valve is provided at its upper end with a hook I that projects upwardly through a hole in the lever K and hooks over or embraces a cross piece K in the hole in'said lever, thereby serving to pivotally connect said valve and lever together. The transverse opening in thehook-shaped portion I at the upper end oft-he needle valve is of such depth and width, and the cross piece K on the lever K is of such thickness and width, that said cross piece can turn freely in the-openingin the hook-shaped portion of the needle valve when thelever K rocks on its pivot 1, due to the rise and fall of the float L. Notwithstanding the fact that the needlevalve can be easily disconnected from the lever K simply by moving the hook-shaped portion I on the needle valve out of engagement with the cross piece K of the lever, the needle valve is capable of only a limited rotary movement relatively to the lever K, because the cross piece K of the lever which extends transversely through the opening in the hookshaped portion 1" ofthe needle will be engaged by the wall I of said opening (see Figure 3) after the needle valve has turned a certain degree. As shown in Figure 1, the needle valve lever K is arranged in the chamber J, and is so shaped that it extends upwardly from the float and then projects laterally over the top edge of the float bowl F. In the carburetor herein illustrated the lever K is rockably mounted on a pivot pin 1 that is located in the chamber or passageway J at a point above the top edge of the float bowl, and said lever is provided with a depending, angle-shaped portion that projects dowmvardly into the float bowl and then laterally over the top side of the float L. The float L is of annular form and is guided by the cylindrical portion E on the body cast ing that projects downwardly through the float bowl. A fuel duct M leads upwardly from the lower end of the accelerating well a: for conveying fuel from said well to a fuel tube M which is used to introduc fuel into the main passageway C of the carburetor when the throttle "alve is closed or only partly open, as described in my auolieation for patent Serial No. 206,030, liledlluly 15, 1927. either by a The fuel duct M can be liorru d vertically-disposed bore in the portion E of the body casting that terms the side wall of the accelerating well or it can be formed by a vertical groove in the exterior of a sleeve N that fits snugly in said well.

In view of the fact that the float lever K is pivotally mounted on the body casting of the carburetor and is so shaped that it projects upwardly and laterally over the top edge of the float bowl, it is possible to form the float bowl from a synnnetrical, eup-shapet'l member, produced by a spinning, drawing or stamping operation and free from slots lateral projections. Accordingly, the float bowl of the carburetor is inexpensive to manufacture, it is absolutely tight, and as it is held in position by the cap screw G, it is easy to assemble.

Another desirable feature of such a carburetor is that the depending portion E on the body casting performs the anal function of an accelerating well and a guide for the float. Moreover, as the fuel duct M that leads from the accelerating well is located on the inside of the portion E, the exterior of said portion can be made of cylindrical. shape and the center hole of the float L only has to be made large enough to receive said portion E, thereby making it possible to use a float of less diameter than the floats of conventional carburetors, which is highly desirable, in that it reduces the costof the carburetor and makes it compact. The float lever K of such shape that it can be formed conveniently and at a low cost from a metal stamping, it is; (OllllJlllOCl with the needle valve 1 in such a way that said parts can be assembled quickly and without the necessity of using a separate fastening device or connecting device, and still another desirable characteristic of such a construction is that the needle valve cannot turn or rotate relativelyto its actuating lever, notwithstanding the fact that said parts are pivotally connected together in such a way that one can be disengaged from the other simply by lifting the hook-shaped poriton on one of said parts from the cross piece of the other part.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is:

1. A carburetor, comprising a body casting provided with a portion whose exterior acts as a float guide, an annular float that surrounds said guide, a float bowl formed by a one-piece substantially cup-shaped member whose bottom is integrally connected to its side wall, a needle valve, and an actuating lever for said valve shaped so that it projects upwardly and laterally over the top edge of said float bowl and having an integral portion that is arranged in direct engagement with said float.

2. In a carlnu'etor, the combination of a body portion. provided with a. lever passageway having an opening at one end which tel minates at the underside of said body portion, a float bowl formed by a one-piece, cupshaped member whose top ed e is clamped against the underside of said oody portion, and arranged so that the interior of same communicates with said passageway, a float in said bowl, a needle valve, a lever in said. passageway having one of its ends projecting downwardly into said float chamber and arranged in direct engagement with said float, a substantially hook-shaped portion on the needle valve arranged in pivotal engagement with a part on the opposite end of said lever that prevents the needle valve from turning relatively to the lever, and a pivot for said lever arranged in said passageway at a point above the top edge of said float bowl.

3. In a carburetor, the combination of a needle valve, a float, a lever for tramanitting movement to said valve from said float, a substantially hook-shaped portion on said valve, a hole in said lever up through wh ch said valve projects, and a cross piece in said hole arranged in pivotal eng ment with the hook-shaped portion on valve.

4. In a carburetor, the combination of a needle valve, :1 float, a lever for transmitting movement to said valve from said float, and a connection between said needle valve and lever composed of a. substantially hook-shaped part on the needle valve arranged in longitudinal alignment with the lever and in pivotal engagement with a part on said lever that prevents said valve from turning or 1o tating relatively to the lever.

WVILLIAM C. CARTER.

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