US1716576A - Carburetor - Google Patents

Description

June 11, 1929. A. A. T. CRESER CARBURETOR Filed March 12, 1925 Patented June ll, 1929 Arrannnueusrus THOMAS cansnn, or BrcHreoNn; ENGLAND. V i

CARBURETOR.

Application filed March 12, 1925, Serial No; l5,0 l2, and. in Great Britain March 18;:1924. i

This invention relates to improvements in carburetors for use ith-internal combustion engines v In these carburetors itis knownto employ a slidable piston-valve or block formed- With achoke tube-tor each main nozzle, the

choke tubes extending directly through the piston-valve or block and being lowered vupon each of the-main nozzles simultaneously so that-the said nozzles are equally:

to be attached.- to the engine, is arranged horizontally a shallow box of rectangular shapeinhorizontal andyertical sections.

uncovered or controlled. 7 fliccordin tovthe' )resent invention 1 I t: I 7

form'the slidingblockwhich contains the choke tubes, in such away that it can be moved backwards and forwards across a I p This lid may be secured to the box by screws f chamber into whichthe' -main nozzles pro fject', and in jsuch a Way that the sliding block and .the choke tubes therein are at right angles to the axes of the said nozzles. The sliding block-is-preferably of rectangu-f lar cross sect-ion.

Theehoke tubes are slotted to accommodate the nozzlesin-this choke tubes.

movementand thes'e slots extend almostup tofthe contracted throat portions of such The rectangular cross-section of the slid-; I ingblock allows in a' given area a larger. number of choke-tubes than doesthe same.- [area of a circularycross sectionof a 'cylin-.:

drical piston valve and anthem-the horizontal arrangement; oftthe SlIClIIIg block "Wltll'hOIlZOIItdl choke'tubes passing across theupstandlng main nozzles enables me to; obtaina straight-through passage for the indrawn -air,--With the minimum impeding of or restriction to 'the'flow of air or ffmi x- The: present invention is hereafter -de rscribed With'referen'ce to" the annexed draw -3 Figure 1 is a plan ofthexbridgefcarrying the main nozzles and idling nozzle.

aasectiongo'n-line 22 of ;Fig-' ings in V which a Figure 2 is Figure 8 is 1s plan view showing the to thenozz'le. v

V a plan view' with cover plate 1 r removed and slidingblockin part'section,

Figure is an 'elevationof the rectangular;

sliding block and Figure 5 th" as bar "with":

device for operating the-sliding block.

Figure? is a diagram, of the Venturi tube Figure- 8 is a-side proved carburetor.

' Between the air intake eformed upon the position of the throat relative i M v g v elevation ofthe, im- I b'ody' 'A of the carburetor and the flange fitting 5Z2 wherebythecarburetor is adapted This box 0 is provided .wit h' a' detachable lld id having'a longitudina'lwslot (Z1 therein;

(5 at the corners. The boxis'arranged to be carried upon abridge E comprising holand screws the box portion a canhbe -de tachably 1 secured to the @lateral arms, of the bridge. The-hollow. arms e at forming-the bridge are closed; at their "outerends by \screWs. s g i i 5 The float chamber f is of any convenient construction and may comprise the usual float with needle valve for controllingther Supply of gasoline to thechamber f From beloyv'th'e box 0 and in such a ay that they are in communication withthe lateral? arm 6 suppliedWvith "fuelifrom'the float chamber 7, extend a number of no'zzle tubes or main nozzles. 7th h aligned acr ossthe box oand-upstanding through and above the. bottom ofr the said box; The ,rectangular sliding'block 'shown at-i covers' these main nozzles 7t and is provided with a correspondifng'number of Venturi tubes j bored horizontally through said sliding: block 6. i 1 These.

Venturi tubes are also. slotted. at is .on their 'llIlClGI'jf'POIlZlOHS (seeFigure; 4), the, open endedslots. in extendingflfrom the inlet on that the'mainnozzletubes or nozzles it enter the tubes; at right an gles to the axes of thehorizontalbores through saidpsliding w er-is movedto-the-right,-

ievement! ese nestles #the intake side (right hand side of Figure v 60 I securing said box chamber to said supporting in its longitudinal movements by'the ribs (Z on the lid d. The stud Z is acted on in one direction by, for example, a coiled spring n and in the other direction a'fiexible connection suchas the well known Bowden wire represented diagramatically at 0, Figure 6, passing through guide 8. Any other suitable device however, may be provided for adjusting'the position of the sl-idable block i relatively to the main nozzles h, and

for the easy movement of such slidable block.

\ Theblock-containing box is preferably [cast in one piece with the air intake a and withthe flange fitting b.- The latter may be of any desired contruction andis bored at 6 V c to' provide an outlet for the mixture, so

that a straight-through passagefor'air or mixture? can be obtained with aminimum hindrance by' reason of the Venturi tubes j in the rectangular-sectioned sliding block 2'.

vThe air intake 4, the chamber 0,-the Venturi tubes and the'mixture outletb are aligned; TheVenturi tubes are so tapered from the ,7 inner ends of the slots is, that at no point is the cross sectional area of thetubes, minus thes'pace occupied by the nozzletube or nozzle h, less than throat. 1

Referring' to Figure 7, the cross sectional the'c'ross sectnonal area-at y.

An idling nozzle is indicated at p deliver ing into the bore?) and a butterfly'throttle lever 1'.

valvev'at-g, this'valve g being of any well known construction, pivoted in the inlet to A and 'regulatedjby an external 3 7 i fin combination, ashallow,rectangul'arly secv v tioned box chamber having an air inlet and +1; A carburetor comprising a body formed,

the body" as alshallow box chamber of rectangular J cross section, said chamber having an air inlet and amlxture outlet and having, aper-- Y tures in the bottom of said box chamber, a

single'sliding block movablebackwards and forwards in said chamber and also-of rec tangu'lar cross section, a detachable lid tosaid box chamber having a slot, a stud upstanding from said 'slidingblock and travel ing in said slot 'in' the lid, a supporting bridge for the box chamber, said'bridge including hollow arms in communication with a fuel supply chamber, means for detachably bridge, a pluralityof nozzle tubes mounted upon one of 'saidbridge-arms and supplied with fuel therefrom, said nozzle tubes upthe cross sectional area at the standing into said box chamber through the apertures in the bottom of said box chamber and being'alined across the box chamber, said single block having a separate Venturi tube formedthereinfor each of said nozzle tubes, and an open-ended slot on the underside of each said Venturi tube, through which slots and nozzle tubes pass, said-tube-provided' and slotted sliding block being arranged in advance of said nozzle tubes and being adapted to be drawn back towards the nozzle tubes so that the latter enter the'said open-ended 1 slots in the rectangularly shaped sliding block. I

2. A carburetor comprising a shallow box chamber of rectangular cross section, said chamber having an air 'inletiand a mixture outlet, a sliding block of rectangular cross section "fitting said chamber andm'ovable therein, a supportingbridge up'onywhich said box chamber is detachably mounted in a horizontal position, nozzle tubes mounted uponsaid bridge, means for supplying said noz zle tubes'with liquid-fuel, there'being apertures in the base of said box chamber through which said nozzle tubes project, a

Venturi tube bored horizontally insaid slid-1 iug block for each of said nozzle tubes," said Venturi tubes having'slots upon then underside extending'almost up tothethroats of i i the said Venturi tubes, to permit thelpa'ssage of said nozzle tubes, said slots having open ends and extending to=the "rear-of said multibored sliding block, said Venturi tubes being so tapered from the inn'erends of the slots that at no point is the cross sectional area of the tube minus the space-occupied by area ata: (less the nozzle) is never less than 3 the nozzle tube, less thanthe cross-sectional area, of the-throat of'th'e Venturi tube, and said air intake, box chamber, and saidm'ultibored sliding block'being alined with respect to each other to afford a horizontal straightthrough passage for the air and mixture.

A multi-nozzle carburetor comprising mixture outlet all cast in one piece, and having apertures in the base-of said box chamber, a-detachablelid to saidchamber having aslot, a sliding block of rectangular section fitted in said box chamber and mov;

able backwards and forwards therein,'saidrectangular block having a stud travelling in theslot in said lid,;aslidable' strip car- 7 ried by said stud and covering the slot in s'aid lid, Venturi tubes bored in said blockfrom front'to rear thereof with their axes parallel with the, line. of ;movement of said block, said Venturitubes having longitudinal, open-ended slots'upo'n their underside extending forwardly from the rear of said block, a float chamber, asupportingbridge having hollow arms, said arms beingsulk plied with'fuelf'rom said float chamber, said bridge maintaining said box chamber and sliding block in a horizontal position ma in through the base apertures in the box charm her and through the slots in the Walls of said Venturi tubes, and means for drawing said slichng' block towards the sald ma n nozzles so thatthe latter can enter said open-ended 10 slots.

In testimony whereof I hereunto alfiX' my signature.

ALFRED'AUGUSTUS THOMAS CRESER.

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