US1577765A

US1577765A - Automatic choker for carburetors

Info

Publication number: US1577765A
Application number: US634576A
Authority: US
Inventors: Glen R Sisson
Original assignee: Individual
Current assignee: Individual
Priority date: 1923-04-25
Filing date: 1923-04-25
Publication date: 1926-03-23
Anticipated expiration: 1943-03-23

Description

March 23,1926 1,577,7 5

' G. R. SISSON 1 AUTOMATIC CHOKER FOR CARBURETORS Filed April 25, 1923 INVENTOR. 62: R. 5/550/V,

By IL A TTORNE Y.

Patented Mar. 23, 19 26. I UNITED STATES PATENT OFFICE.

GLEN n. SISSON, F PENDLETON, INDIANA.

AUTOMATIC CHOKER FOR CARBURETORS.

Application filed April 25, 1923. Serial No. 634,576.

, of which the following is a specification.

It is the object of my invention to provide an automatic choker for carburetors, for regulating the air-supply, especially during starting, so that an efiicient mixture under both starting and operating conditions ma be obtained without requiring special I skil on the part ofthe operator.

In the operation of automobiles, drivers have difiiculty, after starting, in getting the right amount of air. They may fail to start by having too much air. They may fail to start by having too little air. They are apt to have inefiicient 2 many especially in and just operation after starting by reason of too little air, on account of keeping the choker 'closed too long; although many operators kill their engine immediately after starting by opening the chokervalve too wide before the engine is heated up, thus permitting too large an air supply for a cold engine.

In accordance with my invention, I control a supply of air by the operation of the starter motor, so that while the starter motor is in operation this supply of air will be largely or wholly shut off. I preferably arrange this air-supply which is thus controlled by the operation of the starting motor so that it is one of two supplies, leading to the carburetor in parallel; and preferably control the second air-supply by a thermostatic device, responsive as shown to the temperature of the engine in some suitable way, so that such second air-supply is opened more widely as the temperature of the engine rises. My invention contemplates various combinations of less than allthese features, as the claims set forth.

The accompanying drawing illustrates my invention: Fig. 1 is a side elevation of an automobile engine equipped with my invention, the structure being shown semidiagrammatically; and Fig. 2' is an enlarged elevation of-the controlling means for the air-supply.

The enginelO is supplied with explosive mixture by the usual carburetor 11, which supplies such explosive mixture to the engine through any convenient intake manifold 12; andthe exhaust gases from the engine are discharged through an exhaust manifold 13 in the usual way. At least part of the air intake forthe carburetor 11 is conveniently derived from the usual stove 15 on the exhaust manifold 13, so that the air will be heated by the heat of the exhaust gases, though this stove is not essential to my invention.

The air-supply pipe 16 for the carburetor 11 has two

branches

17 and 18, both of which join into the pipe 16 and communicate therethrough with the carburetor 11. These two branches are both shown as deriving their air from the stove 15, though that is not essential. I have shown the two

pipes

17 and 18 merely diagrammatically, without intending to indicate any definite relation as to their relative sizes. The relation between these two pipes may be varied .as desired.

In the branch-pipe 17 is a choker valve 20, which is normally spring-pressed to the open position shown but is arranged to be closed when the circuit of the starter motor 21 is closed. The starter motor 21 is supplied with current from the usual battery 22; and

is controlled by the usual foot-switch 23,

which when depressed closes the circuit of such starter motor. The controlling device for'the choker valve 20 is shown as a solenoid 24 connected in shunt to the starter motor 21, so that it is controlled in common with such starter motor by the foot-switch 23; which solenoid 24 has a core 25 suitably connected to an operating arm 26 of the choker valve 20. A spring 27 or other returning device holds the choker valve 20 normally in open position, but when the solenoid 24 is energized the choker valve 20 is moved to closed position to shut ofl the supply of air to the carburetor through the branch pipe 17.

Thus when the foot-switch 23 is closed to complete the circuit for the starter motor 21, and such-starter motor is operating to turn over the engine 10, the air-supply through the branch pipe 17 is shut ofi' andthe supply pipe 16 of the carburetor must derive its whole supply; of air from the branch pipe 18. This cuts down the quantity of air delivered to the carburetor, and thus assists in starting. As soon as the footswitch 23 is released and allowed to open, both the starter motor 21 and the solenoid 24 are de-energized, and the choker valve 20 is opened by its'spring 27, thus admitting parts are arranged as shown, course lnessentlal.

choker valve 30. I

opened and closed as the temperature of the I more air to the carburetor after the engine is i started While the branch-pipe 18 may be valveless, I prefer to rovide vitalso with a his choker valve 30 is engine rises and falls respectively. To this on the operating arm 31 of the choker valve 30 is connected to any suitablethermostat 32, suitably arranged to be responsive to the temperature of the engine itself, orof something which varies in temperature with the engine. The thermostat 32 is shown as a single two-metal thermostat strip, supported at one end on the exhaust manifol 13, and connected at the other or free en" by a link 33-,to the arm 31. The free end of the thermostat 32 bows upward upon increase of temperature, and downward upon decrease of temperature, if the but this is of Therefore, when the engine is started cold, both

choker valves

20 and 30 are closed, and very litle air is supplied to the carburetor.

'As soon as the engine starts, the choker valve 20 is opened, to admit more air; and as the ture of the engine;and the starting choking is only by the choker valve 20, which is opened as soon' as thexdriver releases the foot-switch 23. v

This makes a substantially fool-proof arrangement, requiring, no skill or care on the part of the operator to get suitable mixtures for starting under all conditions, and for.

- varying the choking 'of the supply of air to the carburetor in accordance with the temperature of the engine.

2. A choking device for an internal combustion engine having a carburetor and a starting device, comprising means for automatically choking the supply of air to the carburetor during the starting of the engine by said starting device, and additional means for choking the supply of air to said carburetor in accordance with the temperature of the engine.

3. In combination, an internal combustion engine, a carburetor and a starting device therefor, said carburetor being provided supply is'so increased.

engine, a carburetor and a starting device therefor, said, carburetor being provided with a branched air-inlet, and a choker valve arranged in one of said branches and controlled jointly with said starting device. 5. In combination, an internal combustion engine, a carburetor and a starting device therefor, said carburetor being provided with a branched air-inlet, a choker ,valve arranged in one of said branches and controlled jointl with said starting device, and a choker va v,e arranged in the other of said branches and controlled'by the temperature of the engine.

6. In combination, an internal combustion engine, a carburetor therefor, said carburetor being provided with a branched airinlet, a choker valve arranged in one of said branches, and means for controlling said choker valve by the temperature of the engine, the other branch being free from control by the temperature of the engine.

7. A choking device for the carburetor .of'

an internal combustion engine having a starting device, comprising means control led jointly with said starting device for automaticallychoking the supply of air to the carburetor during the starting of the engine, .1

by said starting device, and a thermostat for. varying such choking.

8; The combination set forth in claim 7, with the addition that said thermostat is responsive to the temperature of the engine.

9. A choking device for the carburetor of an internal combustion engine having a starting device, comprising means controlled jointly with said starting device for automatically choking the supply of air to the carburetor during the startlng of the engine creasing the choking produced by said choker valve upon increase in temperature of the engine.

10. A choking device for the carburetor.

no I

means being arranged to increase the air supply upon cessation of the starting-device operation, and a thermostat for varying the proportionate extent to which such air 11, A choking device for the carburetor of an internal combustion engine having a starting device, comprising means controlled f jointly with said starting device for auto- 110 .by said starting device, and means for de- 1 inatically choking the silpplyeof ai'r'to the carburetor during the startmg of the engine by said starting device, and a thermostat also exerting a control .on the choking gme.

13. The combination set forth in claim 11,

with the addition that the air-supply to the carburetor is-branched, and saidfirst-named means and said thermostat exert their chokingactions in different branches of said airsupply.

In witness whereof,v I have hereunto set my hand at Indianapolis, Indiana, this 23d day of April, A. D. one thousand nine hundred and twenty-three.

' GLEN'R. SISSON.