US2189554A - Carburetor accelerating pump - Google Patents

Description

Feb, 6, 19400 J. scHwr-zsss 2,189,554

CARBURETOR ACCELERATING PUMP Filed Jan. 16, 1939 2 Sheets-Sheet 1 INVENTOR JOSEPH SCHWEISS MA IQ ATTORNEY 71/145411 Q in! 7/1! I FIJMWM 8 I, I

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""llllllllll F I G Patented Feb. 6, 1940 CARBURETOR ACOELERATING PUMP Joseph Schweiss, St. Louis, Mo., assignor to Carter. Carburetor Corporation, St. Louis, Mo., a corporation of Delaware r Application January 16, 1939, Serial No. 251, 14

' i 3 Claims. (o1.10s 14s This invention relates to fluid pump devices and consists particularly in novel construction of the pressure chamber and valve portions thereof.

The invention is shown applied to the accelerating pump of an internal combustion engine carburetor although it may be readily adaptable to a variety of different uses.

An object of the invention is to eliminate the leakage and wear which accompanies the use' of fluid pumpsutilizing reciprocating pistons.

Another object is to provide greatly simplified inlet and outlet valve structure for a fluid pump.

These objects and other more detailed objects hereafter appearing are attained substantially by the structure illustrated in the accompanying drawings in which Fig. 1 is a vertical transverse section of an internal combustion engine carburetor. I

Fig. 2 is a partial vertical section of the carburetor and taken on a different plane than Fig. 1.

Fig. 3 is an enlarged View showing a part of the structure in Fig. 2.

Fig. 4 is a horizontal section taken on the corresponding section line of Fig. 3, and

Fig. 5 is a View similar to Fig. 3 but showing a modification.

The carburetor in Figs. 1 and 2 has a downdraft mixture'conduit including air inlet horn l venturi 2, and outlet portion '3, flanged as at 4 for attachment to the intake manifold of an associated internal combustion engine (not shown). A choke valve 5 is pivotally mounted in the air horn onshaft 6 which extends, at one end, into a housing I enclosing automatic choke controlling mechanism. A throttle valve 8, near the lower end of the mixture conduit, is provided with a crank 9 for manual control. Adjacent the mixture conduit is a bowl it within whichiuel is maintainedat a substantially constant level by means of the usual needle valve mechanism ll, controlled by float l2. Fuel is supplied to the bowl by means of an inlet connection l3 and, during normal operation, is supplied to the mixture conduit through a calibrated metering orifice member l4, controlled by stepped metering rod l5, and main nozzle It discharging into the throat of the smallest venturi 2.

An arm I! is mounted on the throttle shaft opposite crank 9 and is connected by means of a link l8 to a rock lever l9 centrally fulcrumedupon a pillar block projecting upwardly from the float bowl cover 2|. As shown in Fig. 1, metering rod I5 is carried by lever l9 between ment of piston rod 22.

its connection to link l8 and the fulcrum. At the opposite end of lever H), as shown in Fig. 2, a piston rod 22 is connected to lever l9 by means of a small link 23.

Piston rod 22extends through bowl cover 2| and, at its lower end, is rigidly connected to the upper wall of a pliable sack, generally indicated at 24, received within tubular guide 25 extending between topand bottom portions of the float bowl. An inlet passage 26 connects the float bowl with the interior of sack 24 and an outlet passage 2l"coni1ects'the sack with a small nozzle 23 discharging into the mixture conduit adjacent venturi 2.

Sack 24, as better shown in Figs. 3 and 4, includescylindrical side wall structure 29 and end walls 30 and Bi. Side wall structure 29 and end wall 3i] are preferably formed of a continuous 1 sheet of a suitable gasoline resistant, pliable material such as synthetic rubber. Piston rod 22 is secured to end wall 30 for the application of pumping pressures to the sack. A series of longitudinally spaced circumferential ribs 32 extend around the outer surface of side wall structure 29 and engage the inner surface of tubular guide 25 so as to provide spaces, as at 33, between the guide and the portions of wall structure 29 between ribs 32 to accommodate bulging or flexing of the side wall structure during the application of pumping pressures thereto. Guide 25 funo-- tions to restrict distortion of sack 24 to the bulging and collapsing movement normally incident to pumping.

The other end wall 3i has an. opening 34 communicating with inlet passage 26 and a second opening 35 communicating with outlet passage 21. Wall 3| may be formed of a. block of molded material, such as synthetic rubber, with projecting nipples", as at 36 and 31, projecting oppositely therefrom and normally closing orifices 34 and 35. and have central apertures which are normally closed but which yield when fluid pressures are applied thereto in one direction only to permit the passage or fluid therethrough. Nipple 36 is arranged to function as an inlet valve to permit drawing of fluid through orifice 34 into sack 24 when the latter is expanded due to upward move- Nipple 37 functions as an outlet valve for admitting fuel to outlet passage 27 when the sack is collapsed. During the discharge, nipple 36 remains tightly sealed and during charging of the sack outlet nipple 31 remains tightly sealed.

These nipples are of resilient material is preferably formed of resilient material so as to return to its original shape of its own accord. In Fig. 5 there is shown a coiled spring 38 in the interior of sack M for urging upper end wall 30 in an upwardly direction. The other elements of the structure in Fig. 5 are the same as in the previous form.

The arrangement, form, and adaption of the pumpdevice may be modified in various ways. For instance, lower end wall 3| may be formed of any suitable material and inlet and outlet valve nipples 36 and 37 may be separately formed and secured thereto. I have shown tubular guide 25 resting on the upper edge of a shoulder 39 formed on the lower extremity of sack 24 for holding this extremity in fluid tight engagement with the bottom wall of the bowl, guide 25 being held down by bowl cover 2!. This arrangement of parts is not essential and also the form of the tubular guide 25 may be carried substantially without detracting from its function as guiding and bracing means for the pliable sack. The exclusive use of all modifications as come within the scope of the appended claims is contemplated.

I claim:

1. A fluid pump device comprising a sack having wall structure at least partly of yielding material, inlet and outlet valves in said wall structure, means for applying alternate expanding and collapsing pressures to said structure for drawing fluid thereinto and expelling the same therefrom,

said sack comprising side Wall structure of pliable material and end walls, there being circumferential ribs on said side wall structure, and guide means extending along said side wall structure and engaging said ribs, the portions of said side wall structure between said ribs being spaced from said guide means whereby said portions may bulge and contract during application of pumping pressures to said sack.

2. A fluid pump device comprising a sack formed substantially of pliable material having side and end walls, circumferential ribs on the outer surface of said side wall, guide means extending along said wall and engaging said ribs for limiting distortion of said sack to the bul ing and contracting incident to pumping, inlet and outlet valves in one of said end walls, and means for applying pumping pressures to the opposite end wall.

3. A fluid pump device comprising a rigid tubular guide, a sack formed substantially of pliable material inside said guide, said sack having wall structure including side and end walls, circumferential ribs spaced longitudinally along said side walls and engaging said guide, inlet and outlet valves in said wall structure, and means for alternately applying pushing and pulling forces to one of said end walls to produce bulging and contraction of the portions of said side walls between said ribs.

JOSEPH SCHWEISS.

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