US1881560A - Carburetor - Google Patents

Description

0431:.V 11, 1932. F, H HElTGER 1,881,560

GARBURETOR Filed July 21. 1927 3 Sheets-Sheet l m, a?. S14/manto@ MAE/76.5%?,

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F. H. HEITGER CARBURETOR Filed July 21, 1927 3 Sheets-Sheet 2 aan# 3 Aj. Ob j 7 @Norway Patented Oct. 11, 1932 FRANK E. HEITGER, OF FLINT, 'MICHIGAN CARBURETOR Application led July 21,

This invention relates to carburetors, and more particularly to improvements in the choke valve usually provided in the carburetor air intake, and the invention has for one of its objects to provide means for automatically regulating the choke valve so as to j insure a supply of uniformly rich mlxture in the interval from the moment the engine is started, until it is brought up to its nor- -"1 mal 'operating temperature, the automatic regulation of the valve being combined wlth a manually adjusting device for varying the limits of the automatic control'.

A further object is the'provision of an 5 automatic regulating device employing a spring as an essential element in the regulation of the valve.

Referring to the accompanying drawings,

wherein an approved embodiment of the invention is illustrated:

Fig. 1 is a side elevation of a conventional carburetor illustrating the invention applied thereto,

Fig. 2 is a section on the line 2-2 of Fig. 1',

5 Figures'3 and 4 are diagrammatic views showing portions of the regulating device,

Fig. 5 is a fragmentary side elevation of a carburetor, illustrating amodiication of the invention, and

l0 Fig. 6 is a similar view of a further modiication.

Referring to the drawingsin detailnum eral 5 indicates a lconventional type of carburetor including a throttle control arm 6,

5 fuel reservoir 7, and air intake 8 in which the shaft 9 supporting the choke valve 10 is journalled.

According to the present invention, the shaft 9 is located in a plane below the-axis `=0 of the air intake 8, in order that the differential pressure active on the valve, incident to the air being drawn through the inlet, normally tends to open the valve. Externally of the air inlet 8, an arm 11 is secured 5 to the supporting shaft 9, and carries at its outer end, a swlvelly mounted slide collar 12 receiving the manually operable choke rod 13, which, as will be understood, is extended to a point within convenient reach 0 of the operator of the engine.

1927. Serial No. 207,488.

' ulation of the valve is ineffective.

An adjustable abutment 17, secured in place by a set screw 1B, or equivalent device. 65 is secured to the extremity of the rod 13, and an expansion spring 19 confined between said abutment and the slide collar 12, normally tends to so displace the arm 11 with respect to the rod 13, as to resiliently retain the valve either in closed position, or in such near closed position as the rod 13 will admit, owing to engagement of the slide collar 12 with the stop collar 14.

According to modern practice in the construction and design of carburetors, the choke valve when partially closed, so as to supply a mixture, sufficiently-rich in li uid fuel as to afford proper combustion o an engine during the warming up period, for 86 a certain position of the throttle is ineffective in maintaining uniformity' of the proportion of the liquid fuel at other positions of the throttle, than that for which the choke valve was originally adjusted, and hence the fuel mixture 1s of the improper proportion and the vengine fails to fire regularly.

The present invention, however, overcomes this objection toA known t pes of choke valves for the reason hereina er more fully explained, and in operation, when the engine is initially started in a cold condition, thel choke valve 10 is positively retained in closed position by affecting the adjustment of the rod 13 to supply an exceedingly rich mixn ture for initial starting purposes.4 Thereafter, the rod 13 is adjusted to the position shown in Fig. 3, so as to permit of a limited opening movement of the throttle 10, the extent of such opening movement being dewhen the valve is closed, is so disposed as termined by the operator according to the' suctlon effect acting thereon. For instance, when the engine is running at relativel low speed, and the pressure dil'erencev o the valve is correspondingly low, the spring 19 acting against the pressure of the incoming air, moves the valve toa position farther closed, whereas when the pressure effect on the valve increases, the latter is opened against the tension of the spring to admit a greater quantity of air. When the engine has been heated sufl'lciently for normal running, the rod 13 is manually displaced suiiciently to positively maintain the valve 10 in opened position against the stop 20.

According to the modification illustrated in 5, the valve 10 constructed and mounted on the shaft 9 as previously described, is mounted on the intake of the carburetor andthe arm 21 thereof is connected with a contractile spring, the tension of which normally acts to move the valve to closed-position against the pressure effect of the incoming air. As will be understood, the extremity of the spring 22, opposite the arm 21, is suitably connected with a stationary part of the carburetor.

The opening movement of the valve is variably limited by a stop collar 23, adjustably mounted on the choke rod 24 which latter passes through the extremity of the arm 21. A second stop collar 25, coacting with the arm 21 to positively maintain the valve in opened position, is also adjustably mounted on ,the rod- 24.

The operation of this form of the invention is substantially the same as that described in connection with the form of the invention first illustrated, except-that the spring normally tending to close the valve instead of coacting directly between the arm and choke control rod is interposed between the carburetor body and valve arm.'

The` arrangement according to the modification illustrated in Fig. 6 is substantially the same as that illustrated in Figs. 1 to 4, except that the arm 11, instead of being arranged to extend upwardly from the shaft 9 to extend downwardly from said shaft when the valve is closed.

In view of the similarity of the construction and arrangement of parts, the same reference numerals have been used in Fig.v 6 as those employed in Figs. 1 to 4 inclusive.

As proposed in another of my pending applications, the spring in either of the forms of the invention illustrated, may be constituted by thermo sensitive elements, which, whenV exposed to the exceedingly low temperatures, increase the tension of the proper quantity of air according to theA spring to such extent as to offer greater resistance to the opening movement of the in a position in proximity with the engine.

is affected by the heat radiated from the latter, as theengine is warmed to normal working temperature, and thus the tension of the spring is gradually reduced to normal, as the engine temperature approaches a more moderate thermal condition.

What I claim and desire to secure by Letters Patent is: 1. In a carburetor, an air inlet, a choke valve in said inlet opened in response to incoming air, a manually operable choke valve rod, stop collars arranged in spaced relation on said rod, an arm on said valve movable betweenv'said stop collars, and spring means interposed between the rod and arm, normally tending to move the valve to closed position.

2. In a carburetor, an air inlet, a choke valve in said inlet opened in response to incoming air, a manually operable chok'e valve rod, stop' collars arranged in spaced relation on said rod, an arm on said valve movable between said stop collars, spring means interposed Ibetween the rod and arm normally tending to move the valve to closed position, and means adjustably securing the stop collars on said rod.

3. In a carburetor, an air inlet, a choke valve in said inlet opened in response to incoming air, a manually operable choke valve rod, stop collars arranged in spaced relation on said rod, an arm on said valve movable between said stop collars, spring means interposed between the rod and arm normally tending to move the valve to closed position, and means for varying the tension of said spring means.

4. In a carburetor having an air inlet, a

valve mounted therein so as to be operated by suction, said valve being normally out of action, except when warming up, spring means to resist the opening of the valve, and means to, at will, from a distant point, regulate said spring, and also to positively hold said valve closed, and wide open out of action.

5. In a. carburetor having an air inlet, a valve mounted therein so as to be operated by suction, said valve being normally out of action, spring means to resist the opening of the valve, and means to, at will, regulate said spring, and also positively hold said valve closed, and wide open out of action.

6. In a carburetor having an air inlet, a valve mounted therein so that it may be operated by suction, said valve during normal operation of the carburetor being positively held Wide open and out of action, means operable from a dista-nt point to positively close said valve for starting the motor to which the carburetor is attached and to positively open it wide, said last mentioned means being adapted to adjust a spring which comes into action When the -valve is released from a positive closed position to yieldably oppose the valve opening by suction.

In testimony whereof-I hereunto aix my signature.

FRANK H. HEITGER.

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