US1509694A - Mixer for carburetor outlets - Google Patents

Description

Patented Sept. 23, 19234.

UNETED STATES CHARLES N. SILVER, OF MILWAUKEE, WISCONSIN.

MIXER FOE CAR'BUR-ETOR OUTLETS.

hpplication filed July 21, 1919. Serial No. 312,124.

T 0 all whom it may concern:

Be it known that 1, CHARLES N. SILVER, a citizen of the United States, residing at Milwaukee, county of Milwaukee, and State of lVisconsin, have invented new and useful Improvements in Mixers for Carburetor Outlets, of which the following is a. specificat ion. 1

My invention relates to improvements in auxiliary mixers for internal combustion engine carburetors.

The object of my invention is to provide a mixer in the form of a unit which can be independently manufactured at small cost, and readily inserted between the carburetor outlet and the manifold. A furtherobject of my invention is to provide a mixing unit which can be adjusted in position for use by a comparatively inexperienced person,

and at small cost, and which will operate with a high degree of efficiency.

In the drawingss Figure 1 is a fragmentary view, partly in vertical section, of a carburetor, and the outlet duct which connects it with the manifold, my invention being illustrated in section and in position for use.

Figure 2 is a view of my mixing unit detached and shown partly in section, and partly in plan.

Figure 3 is a rear view of the same.

Figure 4: is a front view of the blank from which the fan wings are formed, showing the same as it is cut p-repatory to binding the wings to the desired contour.

Figure 5 is an end view of the same, indicating one wing in the position which it will occupy when properly contoured.

Lilie parts are identified by the same reference characters thruout the several views.

1 is the casing of a carburetor, which may be of any ordinary construction. 2 is an outlet duct, this being elbowed and provided with an ordinary throttle valve having a valve actuating lever 3. In the ordinary carburetor for internal combustion engines the outlet duct is thus elbowed and provided with a throttle valve, the rear end or outlet end of the elbow being connected with another section 1, which leads to the manifold,

and may be formed integrally with the latter.

My improved fitting is so constructed that it can readily be inserted between the members 2 and 4, both of which are ordinarily provided with coupling heads 5,

which, instead of being directly connected,

as in ordinary practice, are separated sufficiently to allow the casing member 6 of my fitting or mixer unit to be inserted between the coupling heads 5. The casing 6 has corresponding heads 7, adapted to be clamped between the heads 5, as best illustrated in Figure 2.

My improved fitting is provided with a cylindrical passage 8, and at the out-er end of the casing 6 is notched to receive a cross bar 9 having dowel pins 10, which pass thru the bars, and are suitably socketed in the casing 6 at the bases of the notches. The cross bar preferably projects slightly beyond the casing'at the top and bottom, as indicated at 11, whereby when the coupling bolts 12 are removed and the casing '6 withdrawn, this cross bar 9 may be easily removed to permit the removal of the blade, as hereinafter explained.

At the rear end of the casing 6 an integrally formed cross bar 1 1 spans the passage 8, and preferably projects rearwardly into the section 4. The central portion of this bar is enlarged and bored to receive an adjusting screw 16 which has threaded bearings in the bar or cross head 14, and which is secured in the desired position of adjustment by a nut 17. A. set of mixer paddles 20, preferably formed from a piece of sheet metal cut and slitted as indicated in Figure 1, and having a circular central portion 21 provided with an aperture 22, is clamped to a suitable hub 23 by a nut 24 threaded upon a projecting stem 25, which passes thru the aperture 22 of the sheet metal member, and supports the mixing paddles20. The end of the stem 25 is taperedas shown at 27, and loosely fitted to a tapered socket 28 in the cross bar 9 when the parts are assembled in position for use.

The rear end of the hub 23 is provided with a socket to receive. the unthreaded end 30 of the adjustable stem 16, and a ball 31 mounted at the base of the socket in the hub provides a bearing for the end 80 of the stem.

\Vith the construction above described, it will be obvious that by removing the mixing unit from between the members 2 and at of the connecting duct leading from the carburetor to the manifold, the bar 9 may be withdrawn from the notches in the casing 6, after which the stem 25, the mixing paddles and the hub 23 may be withdrawn from the adjustable stem 30. Then by removing the nut 24 the paddles may be removed from thehub, and by loosening the nut 17, the adjusting screw 16 may be readily removed or readjusted. It will, of course, be understood that the parts are assembled in revers order.

In operation this device works quite similarly to any ordinary rotary mixer driven by the pressure of the air and hydrocarbon on its way from the carburetor to the manifold. The particles of atomized hydrocarbon s'trike'the blades of the mixer, and assist in driving the latter by momentum energy. But the impacts of the particles of hydrocarbon on the blades break up the particles, and cause the atomized fragments to be further distributed in the air; also the heat of the engine transmitted thru the walls of the connecting duct to the mixing blades is utilized to raise the temperature of the hydrocarbon, and tosome extent to vaporize it at a point where vaporization has no tendency to reduce the quantity of hydrocarbon as is the case where the hydrocarbon is heated before being delivered to the carburetor.

Further, inasmuch as the mixer blades are rotated by the air and the hydrocarbon in a plane transverse to the direction taken by the mixer, the blades perform the function of bailies to a considerable extent without checking the movement of the air to the same extent as would be the case with stationary bafiles.

From the foregoing description it will be seen that I have devised an exceedingly simple and vefiicient mixer which can be readily inserted between sections of a carburetor outlet duct, and in which clearance for the adjusting screw is secured by making the cross head l t in the form of a bow which projects rearwardly into the duct 4:, and that I am thus enabled to manufacture the entire unit as such, and sell it separately to be attached by any user. It will be observed thatthe apertures 32 which receive the connecting bolts or coupling bolts 12 are slightly elongated laterally, whereby the same unit may be coupled to heads in which the connecting bolts are somewhat differently positioned or spaced.

It Will be understood from the foregoing description that the adjusting screw 16 con stitutes a bearing pin, about the axis of which the hub and mixing paddles rotate, the reduced front end of the hub constitutinga spindle which has a loose bearing in the removable cross bar socket, but withoutappreciable frictional resistance, the thrust '31 interposed.

being exerted rearwardly against the hearing pin or adjusting screw 16, with the ball Therefore, the device 01)- erates with minimum frictional resistance since the ball bears upon the end of the adjusting screw in substantial point bearing contact therewith, and any conditions which tend to increase the frictional resistance of the ball upon the pin will cause the ball to rotate in the socket and ieadjustitself to present new or unworn surfaces for contact with the pin.

I claim 1. In an auxiliary fuel mixer for an internal combustion engine having a carburetor and intake manifold, the combination with an apertured fitting adapted to be secured between the carburetor outlet duct and intake manifold to constitute a continuation thereof, said fitting bein provided at one end with diametricalI opposed, radially cxtending slots; of a cross bar integrally connected with the fitting at the other end thereof, said cross bar spanning the aperture and extending transversely thereof; a second cross bar extending across the aperture and seated in said slots, said second cross bar being provided with a conical. hole concentric with the aperture; a laterally extending pin on the second cross bar adapted to engage the fitting and retain the cross bar in position; a rotary fan member having at one end an adjustable bearing connection with the first mentioned cross bar; and a conical bearing member on the other end of said rotary fan member extending into the conical hole in the second cross bar.

2. In an auxiliary fuel mixer for an internal combustion engine, the combination with an apertured fitting having at one end a bearing spindle and at the other end a bearing socket, of a rotary fan member, said member comprising a shouldered and apertured hub adapted to receive the spindle, and having a bearing stem adapted to extend into the socket, a removable fan member having a centrally disposed aperture adapted to receive the bearing stem, and a nut adapted to threadably engage the stem to clamp the fan to the shoulder on said hub.

In testimony whereof I affix my signature in the presence of two witnesses.

CHARLES N. SILVER Vitnesses Lnvnnn'r'r C. Vin-smirk. CHAS. E. SILVER.

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