US1864375A - Automatic air temperature control - Google Patents

Description

June 21, 1932. c. H. ROOT AUTOMATIC AIR TEMPERATURE CONTRQL Filed Feb. 26. 1931 jg z.

INVENTOR ATTORNEY Patented June 21, 1932 cam. 11. Room, or nmon', moment auromrrc AIR rnmnnhmn comaor.

Application filed February 28, 1931. Serial No. 518,558.

This invention relates to thermostatic heat control for the air entering the carbureter of an internal combustion e gine.

A primar object of the invention is to so construct a evice of this character that it will furnish air to the carbureter at a temperature which gives the greatest efliciency to the motor. 4

Another object of the invention is to so construct such a device that a large area of heating surface will be in contact with the exhaust pipe and thereby warm the motor quickly in cold weather. I

Stillanother object is to so construct such a device that it will be automatic in its operation, avoiding the necessity of the usual manual control.

In carrying out these objects, the invention is susceptible of a wide range of modification without departin from the spirit or sacrificing any of the a vantages of the claimed invention; there being shown in the drawin for illustrative purposes a preferred and practical form, in which:

Figure 1 is a side elevation of a portion of an engine equipped with this improved temperature control;

Fig. 2 is a longitudinal section through the device constituting the invention;

Fig. 3 is a transverse section taken on the line 3-3 of Fig. 2; and

Fig. 4 is a slmilar view taken on the line 4-4 of Fig. 2.

In the embodiment illustrated the device constituting this invention comprises a cylindrical jacket 1 designed to encircle the exhaust pipe E of an internal combustion engine and made larger than said exhaust to permit the free circulation of air around the exhaust, between it and. the jacket. This jacket 1 has an enlarged mouth 2 at its outer end through which cold air is designed to enter the jacket and be drawn into the jacket by the suction of motor. This jacket 1 may encircle the entire exhaust pipe or only a portion and other elements.

thereof as may be desired and has extending laterally therefrom a pipe 2 through which hot air is designed to be conveyed to the carbureter air intake shown at AI in 1 of the drawing, the carbureter being in 59 cated at C.

A thermostat 10 is located within the pipe 2 and is here shown extended longitudinall thereof and includes a shaft or rod 11 whic is journalled or supported in suitable spiders 3 and 4 located at suitably spaced intervals in the pipe 2. The shaft 11 has a small disk 12 fixed to the end thereof beyond the sup port 3 and is designed for a purpose presently to be described. The support 3 is fixedly 5 mounted on a'slidable sleeve 4 fitted within the pipe 2 and designed to be moved by the expansion and contraction of the thermostat 10 as will be presently hereinafter more fully described. This sleeve 4 operates as a valve 05 for bringing into and cutting oif communig cation between the interior of the pipe 2 and the outer atmosphere. The tube 2 is provided with a plurality of openings 5 arranged circumferentially around the tube and over which the sleeve 4 is designed to slide to cover and uncover them according to the heat within the tube. .Fixedly mounted in the tube 2 in rear of the thermostat and disk 12 carried thereby is an annular plate 6 through 7 which the hot air from pipe 1 is designed to pass and the opening in which shown at 7 is covered or uncovered by the disk 12 controlled by the thermostat 10.

A truncated cone-shaped deflector 8 is mounted on the outside of the pipe 2 around the openings 5 therein and secured in any suitable manner with its flared mouth facing outwardly. This deflector is designed to pro tect the openings 5 against entrance of dirt In the use of this device it being installed as shown in Fig. 1, the suction from the en gine will draw the air in through the pipes 1' and 2 and through the air intake pipe AI to the carbureter and from thence to the engine. The heat from the exhaust E will heat the air passing through these pipes and when the passing air becomes heated to. vaflpredetermined point the thermostat 10 expandmoving the disk 12 over the opening 7 in the partition 7 cutting off the entrance of further air and openmg the openings 5 by the removal of the sleeve or sliding valves 4 from over them.

When the air in tube 2 has become sufficiently cool by the entrance of the outside air through openings 5 the thermostat 10 will contract and thus uncover the opening 7 in the partition 6 and permit the heated air from beyond to continue passing through the tube to the carbureter.

It will thus been seen that the temperature air to enter the hot air pipe for conduction to the carbureter, a disc secured inwthe hot air pipe between the heater and the openings in the hot air pipe and located at a right angle to the axis of the hot air pipe, said disc hav-' ing an opening to permit ot air from the heater to pass directly to the carbureter, a

second valve movable axially of-the hot air pipe connected to the thermostat and adapted to close the opening in the disc when the annular valve has been moved from the openings in the hot air pipe.

' CARL H; ROOT.

of the air fed to the carbureter through the airintake thereof will be controlled automatically by means of the thermostat 10 and hence after the device has once been installed no further attention will be necessary.

Without further description it is thought that the features and advantages of the 1nvention will be readily apparent to those skilled in the art, and it will, of course, be

understood thatv changes in the form, proportion and minor details of construction may be resorted to, without departing from the spirit of the invention or its scope as claimed.

I claim:

1. In the combination with the exhaust pipe of an internal combustion engine, an

air heater associated with said pipe, a hot air pipe leading from said heater and connected with the air intake of a carbureter,

the hot air pipe havin a pluralit of circumferentiall dispose passages or placingthe hot air pipe in communicatlon with the atmosphere nected between the 'spiders for causing the cular plate fitting the passages in the hot air pipe pipe of an internal rectly with the atmosphere,

' air pipe and when the temperature of the air 1s mcreased a sleeve within the hot air pipe and movable over said openings, a spider secured to said sleeve, a second spider secured to the interior of the hot air pipe, a thermostat located within the hot air pipe and consufliciently the thermostat will move the valve from the openings and permit atmospheric

Images