US1663804A - Carburetor attachment - Google Patents

Description

March 27, 1928.

M. MACKIE CARBURETOR ATTACHMENT Filed May 1922 INVENTOR. Michell Mackte ATTORNEY.

Patented Mar. 27,1928.

MITCHELL 'MAGKIE, or WAU-KESHA, wrsconsm, nssrenoaro M TCH LL MACKIE COMPANY, or MILWAUKEE, Wisconsin, A CORPORATIONOF wrsoonsm;

cnnnunnron "ATTACHMENT,

Application filed May 19,

This invention relates to a newan'd useful -a-ttachmentifor a carburetor, and 1s moreespecially des gned for 13186111 connection with internal combustionengines of that type em- 5 ploye dnas the motive power for vehicles.

, Many. attempts have been madeiin the past 7 to t'ac ilitatethe starting of internal combusgtionenginesimcold weather allot whlch have-met with moreor less failure, that --theydo not operate except after the engine has been running 'for sometime, as in t he case ofdevicesemploylng the englne'exhaust gasesaas aheatin-g medium, or elseJthey inevolve other complicated electrical appliances 5 arrangeldtofheat the :entire charge and re quiringlarge radiating surfaces.

In view of the above and other objections.

to internal combustion engine charge heating 7 devices -now ingeneral use, this invention has torrone of ltSzObjBCtStQPlOYldG a device so 7 designed'and constructed asto be capable of application tocarburetorsin useor at the time of their manufacture and which require but a small heatingsurface-which comes in 2, contact with the. initial fuel and is preferably renderedinoperative afterthe engine has started .or become warm by its own opera: tions.

.Soine -ofzthe conventional types of earhuretors now, onothe market have faby-pass Jlea'dingfromthefuel supplyto a point adjacent the engine side of the throttle valve when ininearly closed position so that a'rich C, plugged and the screwing'therein'of one end i of a heating unit whereby, the fuel drawn through the passage is thoroughly heated v :by. contact With theaend of the heating memo.ber-to, assis t the starting operation'of the ;engine;

It:is a .further object of this invention to I V providerasheating unitso designedfan'd con 9 structed as to require but a minimum amount of energy topr o-perly heat the radiator plug heatingofnan excessive; area: oi the ca'rbure-V tion;

1922. serial No. 562,195;

tor device but the heat is applied and limited as much as possible to the fuel passing through the bypass to the engine side of the throttle valve.

The priming of an internal combustioniem gine, when cold, may have a deleterious effect as the heavier particles of the raw tu'eldo notignite,but may leak past the pistons" into the crankcase, diluting the lubricating oil 'thei'ein'and causing-a severelossin', engine efficiency. Therefore, this invention has'for I a still ,jfurther object to provide means for priming anengine and, at the same time, eliminatecrank case oil dilution.

With the aboveand other objects in view which will appear as the description proceeds, my invention resides in the novel construction, combination and arrangement of 7 parts substantially as hereinafter described and .more particularly defined by the appended claims, ,it being understood that'such changes in'the precise embodiment of the herein disclosed nvention may be made-as come, withinthescope of the claims.

In: the accompanying drawings, Ihave illustrated one complete exampleof the physical, embodiment of, my invention constructed accordingto the best mode 'I'have so;far devised for "the 'ipractical application, ofthe principles thereof, andinwhich:

Figure 1 is a top View ofone type ofcarburetor equipped with my invention, parts thereofbeing broken away and in section to more clearly illustrate details of construc- Figure 2 is .a detail view of the'heating nnit detached from the carburetor, said view form of my invention illustrated in Figure 3 with a carburetor.

-111 the drawings,.th e numeral5 designates v the fuel bowl or float chamber of'a.carbure thereof whereby noenergyis Wastedby the tor having aimixing chamberltl connected outlet 7 which is connected with a manifold 8 and controlled by a throttle valve 9. Air is supplied the combustible mixture through a controlled air inlet 10. i

In a number of carburetors, an idling bypass 11 is formed in the side wall of the mixing chamber with its outer end communicating with the interior of outlet 7 adjacent valve 9, when in closed position, and its inner end terminating in a pocket or recess 12 connected by a duct 13 with a well, or fuel passage 13, communicating with the mixing chamber.

The by-pass 11 comes into play when the engine is being started with the throttle valve substantially closed when the raw liquid fuel in the well, with which duct 13 communicates, is drawn therethrough into the engine cylinders. The drawing of liquid fuel into the cylinders of a cold internal combustion engine for starting is objectionable in many ways as the heavier particles of the raw fuel leak past the pistons and into the crank case and mix with the lubrieating oil, diluting the same. Furthermore, this raw fuel entering the cylinders tends to dampen the spark and thus hampers instead of facilitates the starting of the engine.

In practiceI have found that very efficient results are obtained by internally threading recess 12 and inserting therein a heating element, with which all fuel passing through by-pass 11 is subjected and thus reduced to a substantially'vapor state or at least sufficiently heated so that the heavier particles vaporize readily and thus eliminate dampening of the spark and consequently greatly facilitate starting.

As illustrated in Figures 1 and 2, the means I provide for heating the fuel consists of a plug or stud member 14, the opposite ends of which are threaded, as at 15 and 16. end 15 being preferably corrugated, as at 17, and secured in recess 12 with its inner end adjacent the inner termination of by-pass 11 and flange 18, formed on stud 14, engaging the carburetor casting.

That portion of stud 14 between flange 18 and end 16 is provided with an insulating covering of mica, or the like 19 around which is wound a heating coil or element 20, one end of which is electrically connected with stud 14 by a securing nut 22 for a sleeve or guard 23 enclosing the heating element. The sleeve or guard is insulated from nut 22 of the heating element and'from flange 18 by washers 24 and the other end 25 of heating element is electrically connected with the sleeve so that a suitable terminal 26 may be conveniently electrically connected there with to afford means for connecting the heat ing element, a one wire circuit. It will be readily appreciated that coil'20 may be insulated from stud 14 and connected in a two wire circuit.

With end 15 corrugated as illustrated an increased heating surface is provided and in the operation of the device, fuel drawn into recess 12 strikes end 15 and is reduced to a vapor state or else heated to a degree sufii cient to volatilize the heavier particles and facilitate starting of the engine.

As illustrated in FigureB, the stud designated at 14' may be hollow and has a tubular stem or nozzle 27 projected centrally therefrom which is directly connected wit1 the conduit 13 so that all fuel drawn through by-pass 11 is first drawn into a heating chamber 28 within stud 14 and then out through apertures 29 and bypass 11 leading to the intake manifold. The chamber 28 is connected with the fuel supply in the manner illustrated in Figure 5 and previous to securingthe attachment in position, the screw or nut 30 fixing the conduit 13 in place preferably has its central bore tapered to have a snug fit with the tapered end of the nozzle 27. a

What I claim as my invention is:

1. The combination with a carburetor having a fuel mixture passage adapted for connection with an engine intake manifold, a; throttle valve in the passage forcontrolling the volume of air and fuel supplied the engine and a by-pass formed in the wall of the fuel mixture passage and leading direct from the fuel supply to the fuel mixture passage near the engine side of the throttle valve, of means for heating only the fuel passing through the by-pass and including an electrical heating member.

2. An attachment of the character described, comprising a tubular stem having one end threaded to provide means of securement in an opening communicating with a carburetor idling by-pass, a nipple extended from the tubular stem into the fuel passage of the by-pass, the bores of said stem and nipple communicating, an outlet connecting the bore of the stem with the outlet side of the fuel passage, whereby fuel flowing through the fuel passage enters the tubular stem through the nipple'and re-enters the passage through the outlet, and a heating element carried by the unthreaded portion of the stem. V

3. The combination with a carburetor having a fuel mixture passage adapted forconnection with an engine intake manifold and an idling by-pass one end of which is connected with the source of fuel and the other with said passage, said by-pass being formed in the walls of the carburetor and having a substantial bend therein at a medial point of a heating member adapted to be inserted into said by-pass at the bend therein whereby fuel fiowing through the by-pass contacts with said member as it passes the bend therein. a I a 4. The combination with a carburetor havof said nipple being inserted into said pascoil for heating the nipple and cylindrical ing a fuel passage medially formed with a and communicating with the outlet portion substantial bend, of a cylindrical member, a of the passage, whereby fuel flowing through 10 heat conveying nipple extending from one the passage flows through said nipple and end of the cylindrical member, the outer end cylindrical member, and an electric heating sage at the bend therein, said nipple dismember. charging into the cylindrical member, an

outlet leading from the cylindrical member MITCHELL MACKIE;

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