US1304205A - rossum - Google Patents

Description

C. A. AND 0. F. ROSS'UM.

CABBURETER.

APPLICATION FILED JAN. 8. 1917.

1,304,205. Patented May 20, 1919.

2 SHEETS-SHEET I VITN ESSES C. A. AND O. F. ROSSUM.

CABBURETER.

APPLICATI'O?! FILED mu. 8. 151.

2 SHEETSSHEET 2.

Patented May 20, 191v.

UNITED STATES PATENT OFFICE.

CARL ALBERT nossum an oscan rnnnnnrx nossum, or WINNIPEG, MANITOBA,

CANADA.

cmrunn'rnn.

Specification of Letters Patent.

Patented May 20, 1919.

To all whom it may concern:

Be it known that we, CARL ALBERT Ros-.

sour and OSCAR FREDERIK RossUM, both of the cit of Winnipeg, in the Province of Manito a, Canada, have invented certain new and useful Improvements in Carbureters, of which the following is the specification.

The invention relates to improvements 1n carbureters as used with internal combustion engines wherein a distillate such .as gasolene or kerosene is used as the fuel and the principal object of the invention is to provide a carbureter in which the eflicient vaporizing of the fuel'by direct heating can be had as it isbeing mixed with air thereby providing a highly eflicient firing mixture for the engine. v

A further object is to arrange the carbureter such that the external heat utilized for vaporizing the fuel will act over a comparatively large area and thereby not only efiiciently vaporize the fuel but also accomplish vaporization quickly.

A still further object is to provide the carburetor with a specially constructed air valve adjustably mounted so that it can be regulated to insure a constant firing mixture at all speeds.

With the above objects in view the invention consists essentially in the arrangement and construction ofparts hereinafter more particularly described and later pointed out in the appended claim, reference being'had to the accompanying drawings in wh1ch:-

' Figure 1 represents a plan view of the complete carburetor.

F1g. 2 a vertical sectional v1ew longitudinally through the same.

Fig. 3 an end view of the carburetor, part bein shown in vertical section. the section passing. longitudinally through the float chamber.

Fig. 4 represents a perspective view of the exhaust gas tube and the surrounding stationary tube forming between them an annular chamber.

Fig. 5 represents a perspective view of the adjusting tube.

Fig. 6 represents a perspective view of the adjusting sleeve an lever.

In the drawings like characters of reference indicate corresponding parts in the several figures.

The carburetor body is atwo-part one, be-

ing formed from an upper casting 2 and a lower casting 3 suitably bolted together as indicated at 4 through lugs provided.

The lower casting is designed to provide a shortinlet air pipe 5, avalve seat 6, an upstanding interiorly screw threaded boss 7 centered below the valve seat, a crosswise extending float chamber 8 communicating through an outlet duct 9 with the bottom ,of the casting and provided with an. en

trance opening 10 for the fuel and an intewith the air pipe as indicated at 12 around the outletduct 9 and terminates in an upwardly extending choke tube 13 located at the opposite side of the casting to the air inlet pipe 5.

The top casting is arranged to present an interior mixing'chamber 14 which communicates' with the tube 13 at the one end and with the air pipe 5 at the other end, this latter passage being eifected through the 'airfloat simply operates to control, the admission through the needle valve to the float chamber of the distillate or fuel such as gasolene or kerosene. Obviously upon the level of the liquid in the float chamber lowering the float willv cause the needle valve to rise which will admit-of the inflow of further liquid to the float chamber, it being understood that the inlet opening is in direct rior air passage. 11 which communicates communication with a reservoir or other source of supply.

To the base of the under casting 3 we bolt a special base plate 20 having an interior duct 21 therein communicating with the duct 9 and provided further with an upstanding tube 22 which is'inserted through the bottom of the casting 3 and extend upwardly centrally within the tube 13 of said casting. The upper end of the tube 22 terminates adjacent the contracted or choking portion 13 of the tube 13 and has the upper end'thereof coned out as indicated at 23.

To the underside of the base plate we fasten a vertically extending exhaust gas tube 24 which passes upwardly through the carbureter from top to bottom and extends in passage through the tube 22, there being an annular reservoir between these tubes as indicated 'at 25.

The upper end of the gas tube is supplied with an elbow 26 whereby it can be readily connected to the exhaust gas pipe of the engine, while the exit from the lower end of the said tube is controlled by a valve 27.

From the above arrangement it will be obvious that the fuel in the float chamber is free to pass directly through the ducts 9 and 21 to the annular chamber 25 formed between the tubes 22 and 24.

The upper casting 2 carries an adjusting tube 28 which surrounds the tube 24, has-the upper end thereof screw threaded into the casting and fitted with opposing pairs of notches 29 and the lower end thereof adjacent the upper end of the'tube 22 coned as indicated at 30 in the opposite direction to the coned end 23 of the latter tube.

An adjusting sleeve 31 is mounted on the upper end of the tube 28 and is supplied with outstanding wings 32 and a lever 33, these being arranged to fit into the notches 29 hereinbefore described.

The above arrangement is such that one can by swinging the lever screw the tube 28 up or down and effect the enlargement or contraction of the outlet passage 34 appearing between the coned ends of the tubes 22 and 28 which passage, it will be noted, forms the only connection for the fuel between the annular passage 25 and the upper end of the tube 13.

35 represents a spindle passing downwardly through the carburetor and having the upper end thereof fitted with a knob or finger piece 36 and the lower end thereof screw threaded into the boss 7.

' 37 represents a sleeve mounted on the upper end of the spindle and screw threaded as indicated at 38 through the top of the upper casting. The threads of the sleeve are directly opposite to the threads of the spindle, that is to say, if the threads of the spindle be right hand, then those of the sleeve are left hand. The sleeve is supplied at the upper end with a head 39 interiorly boredto receive a spring pressed dog 40 which rides on the face of the spindle and is adapted to engage with one or other of longitudinally disposed slots 41 provided in the face of the spindle.

The edge of the head is notched as indicated at 42 and such notches are engaged by a pressure spring 43 bolted at 44 to the top casting.

'45 is an air valve normally seated on the seat 6 and slidably mounted on the spindle.

46 and 47 are a pair of cups mounted on the spindle at opposite sides of the valve, the cup 46 abutting the lower end of the sleeve 38 and being held in this position by an inserted coiled spring 48 set on the top side of the valve, while the cup 47 is seated against a pair of lock nuts 49 being held against them by an inserted coiled spring 50 having the upper end engaging the underside of the valve.

The above arrangement allows of a very fine adjustment of the valve as the tension in the springs can be adjusted as desired and in the following way If one turn the head of the sleeve 37, the spring 43 will click past the notches 42, while the dog 40 will remain in the slot 41 and the result is that the sleeve in screwing up or down will effect a movement in the spindle and owing to the opposite threading of the sleeve and spindle will cause the cups to simultaneously draw together or spread apart to increase or decrease the tension of the springs at opposite sides of the valve.

On the other hand, if one hold the spindle and turn the head of the sleeve or vice versa he can effect an independent adjustment of the top or bottom spring on the valve.

The large range of adjustment possible with this construction of valve insures proper control of the air flow and consequently a proper firing mixture at all speeds.

The outlet pipe 15 and the inlet pipe 5 are provided with throttle valves 51 and- 52 which can be regulated as desired.

When the carbureter is operating at low speeds the air entering through the pipe 5 passes directly to the tube 13 where it is mixed with the vapor escaping from the passage 34, the mixing of the vapor with the air taking place at the contracted part of the tube. Afterward the mixture passes up throu h the outlet pipe 15 to the intake mani old of the engine.

The fuel admitted to the chamber 25 is vaporized positively and effectively by the hot exhaust gases passed downwardly through the tube 24 and controlled by the valve 27 As the engine gains speed the valve 45 automatically 0 ens and allows auxiliary air to pass direct y into the mixing chamber so that a more lean mixture is passed to the manifold than where the engine is running at low speeds and requires a rich mixture such as is passed up through the upper end of the tube 13.

What we claim as our invention'is:

In a carbureter, the combination with an air inlet passage, a mixing chamber and a source of liquid fuel supply, of a contracted choke tube connecting the air passage with the mixing chamber, an exhaust gas tube passing through the carbureter and extending through the choke tube, an upstanding outer tube surrounding and spaced from the lower end of the ekhaust gzis tube and providing a fuel intake assage communicating with the source of f'ue supply, said outer tube having the upper end thereof inward-1y coned and terminating adjacent the contracted port-ion of the choke tube, an adjusting tube 28 adjustably mounted in the upper portion of the carbureter and surrounding the upper portion of the exhaust gas tube and havm the lower end thereof outwardly coned an spaced from the inner end of the upstanding outer tube and providing an adjustable fuel outlet passage to the interior of the choke tube, an adJustable sleeve mounted on the upper end of the tube 28, and an adjustable 15 valve located at the lower end ofthe ex haust gas tube.

Signed at \Vinnipeg, this 13th day of December 1916.

CARL ALBERT ROSSUM. OSCAR FREDERIK ROSSUM. In the presence of- G. S. ROXBURGH, ROLAND 'FOSTER.

copies at thin potent my be obtained (or he cents each, by addressing the "fiommiuioner of l'atentl.

'uhhgton, D. 0.

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