US1167426A - Carbureter. - Google Patents

Description

w. H. PARK.

CARBUHETER.

APPLICATION FILED SEPT. 8, 1913.

Patented Jan. 11, 19H3.

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APPLICATION FILED SEPT. s, I9I3.

M. Patented m. II, 1916.

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WILLIAM R. PARK, OF TAUNTON, MASSACHUSETTS, ASSIGNOR TO UNITED INJECTOR COMPANY, 0F NEW YORK, N. Y.; A CORPORATION'OF NEW YORK.

CARBURETER.

Specification of Letters Patent.

Patented Jan. Jil, 1916.

Application led September 8, 1913. Serial No. 788,500.

To al?, whom t may concern:

Be it known that I, WILLIAM R. PARK, a citizen of the United States, and resident ot Taunton, in the county ot Bristol and State of liz'lassach'usetts, have invented new and useful Improvements in Carbureters, of which the following is a specification.

My invention relates to carbureters for supplying combustible mixtures to internal combustion engines, and `consists in improvements which while generally applicable are particularly adapted to acarbureter of the character shown and described in United States Letters Patent No. 955,353, issued to me April 19, 1910. One of the chief characteristics ofthe carbureter de scribedl in the aforesaid patent is a' gravity air valve controlling the air duct which supplies the mixing tube of the carbureter. This air valve as arranged in the carbur'eter shown in the said patent is necessarily quite heavy, and consequently possesses consider able Ainertia and is therefore not quite as sensitive as might be desired.

I have found by investigation and demonstration that in a carbureter in which the supply of liquid fuel is graduated in some direct proportion to the supply of air it is desirable so to proportion the passages leading to the engine that a decidedly high vacuum shall be produced in the mixing tube, say one corresponding to 30 inches of water column. lVith such a manometric value in the mixing tube it is obvious that a valve arranged as shown in my said patent will necessarily be quite heavy, and for this reason lack that sensitiveness which is desirpart of the casing.

able.

In the drawings hereto annexed which illustrate my improvements,-Figure 1 is a vertical section ofa carbureter; Fig. 9. is a plan view, partly broken away; Fig. 3 is a vertical section on the line 3-3 of Fig. 2; and Fig. et. is a plan view of a detail, namely, the adjusting yoke which forms part of the connections between the air valve and the fuel supply valve.

In thesedrawings, the carbureter casing is composed of several parts, A, A', A2, the float chamber A3 being formed in the lower The mixing tube B which is preferably' in the form of a constricted passage, comprises a depending portion B" which lower part A of the casing. The fuelsupand a binding screw extends down into therises through the annuler duct between the central air tube D and the surrounding tube N. The latter is mounted on the centra-l boss E at the periphery of which is formed the valve seat E, the latter coperating with the air valve V. This air valve V is a gravity valve, and is provided with a seat ing edge at V which seats on the periphery E ofthe boss E. The diameter of this valve seat is less than the external diameter of the depending portion V of the mixing tube B, and the valve V is mounted to slide upon the exterior of this portion B of the mixing tube. Additional bearing may, if desired, be had, as at V2 on the central tube N. The valve V is grooved, as at V3, this groove cooperating with the stem F which forms part of the connection between the air valve- C and the needle valve I formed by the lower end of the stem 1. This connection comprises also the yoke G which is split at G and threaded to receive the threaded end F of the rod F.

At I2 the stem Ivis secured to the yoke G, H serves to lock the yoke G and rod F irmly together.

A squared keyhole F2 is formed in the top of rod F so that by means of a suitable key, adjustment of the connection between the air valve V and fuel valve I may be made. These connections are housed in the portion A2 of the carbureter casing, this latter being supplied with a suitable cover A4.

Since the diameter of the lower portion B of the mixing tube B is greater than that of the seat V of the valve V, this valve is a diil'erential valve; therefore it may be made of light weight and consequently possess little inertia, and at the same time be sufficiently heavy to control the air inlet properly under conditions of low pressure in the mixing tube B. i

It is essential that the valve V shall at all times slide smoothly on its bearings, and although the double bearing at Vand V2 is almost certain to suffice for this purpose, I have found it advisabley to apply a steadyingiinger to the side ot' the valve V. Such a finger is shown in Fig. 3 at K, this being secured to t-he carbureter casing at K and provided with a soft pad,as of felt, at L, which bears with a light touch against the valve V. This steadying finger being opposite to the connectionwith the fuel valve serves eti'ectually to check any tendency of sticking or chattering of the valve.

I claim:

l. In a carbureter, the combination of a tubular gravity air valve, a seat therefor coacting with the lower end of the tubular valve, a mixing tube entering the upper end of the tubular air valve and constituting a sliding bearing for the valve, the diameter of the upper end of the tubular bore of the air valve being greater than that of the lower end, a fuel inlet communicating with the interior of the mixing tube, and a needle valve to control the fuel supply, connected with and operated bythe gravity air valve.

2. In a carbureter, the combination of a tubular gravity air valve, a seat therefor coacting with the lower end of the tubular valve, a mixing tube entering the upper end of the tubular air valve and constituting a sliding bearing for the valve, the diameter of the upper end of the tubular bore of the air valve being greater than that of the lower end, a steadying finger bearing on the gravity air valve, and a fuel inlet communicating with the interior of the mixing tube.

3. In a carbureter, the combination of a tubular gravity air valve, a seat therefor coacting with the lower end of the tubular valve, a mixing tube entering the upper end of the tubular air valve and constituting a sliding bearing for the valve, the diameter of the upper end of the tubular bore-of the air valve being greater than that of the lower end, a'fuel inlet communicating with the interior of the mixing tube, a needle valve to control the fuel supply, connected with and operated by the gravity air valve, and a steadying finger bearing on the gravity air valve.

Signed by me at Boston, Massachusetts, this lth day of September 1913.

WILLIAM R. PARK. Witnesses:

CHARLES D. WOODBERRY, ODIN ROBERTS.

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