US1881255A

US1881255A - Gasoline pump

Info

Publication number: US1881255A
Application number: US173631A
Authority: US
Inventors: Clarence J Whitacre
Original assignee: CHESTER H BRASELTON
Current assignee: CHESTER H BRASELTON
Priority date: 1927-03-08
Filing date: 1927-03-08
Publication date: 1932-10-04
Anticipated expiration: 1949-10-04

Description

Oct. 4, 1932.

C. J. -WHITACRE GASOLINE PUMP Filed March 8. 1927 3 Sheets-Sheet 1 ATTORNEY 0i2. 4, 1932. J, wan- 1,881,255

GASOLI'NE PUMP Filed March 8. 1927 5 Sheets-Sheet 2 5 EVYIIIM ATTORNEY Oct. 4, 1932. c. J. WHITACRE 1,831,255

' GASOLINE PUMP Filed March 8. 1927 3 Sheets-Sheet 3 INVENTOR CLARE/V65 I WH/T/JCRE BY ,l 4, "n

ATTORNEY A of power when the pressure in the pump Patented Oct. 4, 1932 UNITED STATES I PATENT OFFICE CLARENCE J. WHITACBE, 0F DETROIT, MICHIGAN, ASSIGNOR TO CHESTER H. BRASELTON,

' OF NEW YORK, N. Y.

GASOIPINE PUMP Application, filed March 8', 1927. Serial No. 173,631.

This invention relates to liquid pumping devices, particularly of the type designed to supply fuel to carburetors of automotive internal combustion engines.

One of the objects of the invention is to provide an automatically controlled liquid pumping device for pumping fuel directly rom the fuel supply tank to the carburetor of an internal combustion engine without the use of an auxiliary supply tank.

Another object of the invention is to pro vide' a liquid pumping device which may be positively operated by the engine but which is rendered inoperative as. the pressure in the outlet connection of the pump rises above a predetermined amount.

Another object of the invention is to provide a liquid supply pump for automotive internal'combustion engines which will antomatically disconnect itself from the source been illustrated in the accompanying drawings, in which:

Fig. 1 is a side elevation of a preferred embodiment of the pump;

Fig. 2 is an enlarged sectional side ele-' vation'of the pump shown in Fig. 1;

Fig. 3 is a sectional plan view of the pump taken on the line 33 of Fig. 1;

Fig. 4 is a sectional plan view taken on the line 44 of Fig. 2;

Fig. 5 is a sectional plan view taken on the line 5--,5 of Fig. 2;

Fig. 6 is a sectional elevation taken on the line 66 of Fig. 2;

-Fig. 7 is a sectional side elevation of an- I other embodiment of the invention;

. Fig. 8 is a sectional end view of the embodiment shown in Fig. 7 taken on the line 8-8. of Fig. 7 y

Fig. '9 is a sectional plan view of the outlet and inlet connections of the pump taken on theline 9-9 of Fig. 8; and

Fig. 10 is av modification of the bellows shown in Fig. 7.

Broadly the invention comprises a pump having relatively movable parts and valve outlet and inlet connections thereto.

inlet connection to the pump may be connected directly to the supply fuel tank of the automobile and the "outlet connection may be connected directly to the carburetor of the engine. A- means is provided to cause the pump to operate from an intermittently moving part of the engine. The pump is designed to supply more fuel than is required under maximum consumption of the engine and as the pressure is built up in the outlet pipe of the pump due to the pump supplying an excess The automatically separated and the pump is disconnected from the operating means whereupon fuel ceases to flow through the pump until such time as the pressure in the outlet connection thereof is lowered.

7 Referring now more specifically to the drawings, the pump as shown in Fig. 1 is attached to the crank case 10 ofan internal combustion engine having a cam shaft 11 upon which is mounted a series of cams one of Several embodiments of the inventlon have a which 12 is shown as operating the valve stem 13 and also the lever arm 14 of the pump. For convenience in attaching the pump to the crank case or for other reasons, it may be desirable to space the lever arm between two of the cams and in this case a specially designed cam may be mounted on the cam shaft in the proper location.

The pump comprises a cylindrical casing 15 having an open upper end which is flanged as at 16 and this end is closed by the cover plate 17 which is attached to the flange 16 by the screws 18. The cover plate 17 has a hollow portion 19 extending parallel thereto by which the pump may be attached to the crank tight connection between the extended'portion 19 and the crank case 10 of the engine, a

flange 22 is provided adjacent the hole 21 and letconnection casting and the manner of his flange 22 is adapted to be inserted .in the hole in the crank case. A suitable gasket 23 may be inserted between the plate 20 and the side of the crank case and the whole may be secured to the crank case by the stud bolts 24.

A hollow piston 25 is attached to the lower end of the casing, in a manner which will hereinafter be described, and a cylinder 26 is adapted to reciprocate upon the piston 25.

Both the piston and the cylinder are prefer- 7 ably dome-shaped at their upper ends, and the cylinder has a flange 27 extending around its lower end upon which rests the lower end of a spring 28. The upper end of the spring 28 rests against the cover plate 17 and the spring therefor normally urges the cylinder toward its lowermost position with respect to the piston. A lug 29 may be provided on the upper end of the cylinder and to this lug may be pivoted a short connecting rod 30 which extends up through a hole in the plate 17 into the hollow portion 19 and is pivoted to the lever arm 14 which is pivoted to theextended portion 19 by means of the screw 32 which extends across and between the two sides thereof. The piston 25' has a neck 33 extending upwardly at the top thereof and an opening 34 in this neck provides communication between the pumping chamber and the inside of the piston. The outside of the neck 33 is turned slightly outwardly to prevent any lubricant which may happen to Work up the side ofthe piston from passing through the opening 34. The extreme lower end 35 of the piston 25 is somewhat smaller in diameter than the upper part, and is threaded at the end to receive thenut 36. An outlet casting 37 is provided having a round flat hollow extended portion 38 connected thereto by means of a stem 39. The .round portion 38 is drilled to receive the end 35 of the piston and when slipped in place over the end of the piston is firmly secured thereto by the nut 36 which thereby holds theoutlet casting 37 together with the piston 25 firmly positioned with respect to the casing 15. The inside of the round portion 38is large enough to provide an annular chamber 38 around the lower end of the piston and the interior 7 a substantially constant flow of fuel.

of the piston communicates with this chamber through an opening 40. 'A conduit 41 extends horizontallythrough the stem 39 and connects with a vertical conduit 42 in the casting 37. At the top of this conduit 42 may be secured the outlet valve 43. while the lower end thereofmay be closed by the plug 46. The casting 37 is preferably round and may be threaded to receive the'dome-shaped cap 44 which provides an air cushion to insure Adiacent the conduit 42 is another opening in the casting 37 in may be screwed.

which the outlet connection 45- By means of the construction of the outattaching. to the casing of the pump, the air chamber and casing may be swung around the pump casing in any desirable direction and secured there by the nut 36. Thus the pump may be conveniently attached to a crankcase and the air chamber and outlet connection swung in that direction Where it will least interfere with other parts and accessories of the engine.

Fuel is admitted into the pump through the lower end of the piston 25 in the following manner. The bore of the lower end 35 of the piston is threaded adjacent the end thereof to receive a tubular member 47. This member has an upper portion 48 somewhat smaller in diameter than the inside bore of the piston so that an annular passage 48- is provided round the tubular member 48 to permit fuel to flow into the outlet opening 40. The upper end of the tubular member 48 is provided with a check. valve 49 ofany suitable design. The lower end of the tubular member 47 may be threaded to receive the inlet pipe 50 from the fuel tank and a polygonal shaped rib 47 may be provided thereon to facilitate screwing the tubular member into place.

The operation of the device will now be describe duit 42, through the check valve 43 into the air chamber formed by the shell 44, and out through the outlet'connection 45 direct to the carburetor. The flow to the carburetor may be regulated in the well known manner by the needle valve and float arrangement inside the carburetor and when the carburetor has become full of fuel, the needle valve is closed by the float whereupon no more fuel can enter the carburetor and pressure is gradually built up in the air chamber formed by the shell 44.

As this pressure increases, it is transmitted .to the interior of the pump chamber and gradually lifts the cylinder against the pressure of the spring 28. As the cylinder 26 lifts, the lever arm 14 is rocked about its 1 pivot 32 and the end 14a is moved away from the cam'12 in this-manner the stroke of the pump becomes less and lessas the pressure inside of the pump increases until there may come a time when the pump ceases to f nction entirely. However, during normal operation of the pum as the pump is designed to provide more uel than is necessary for the ordinary consumption of the engine, the pressure will be maintained within the pump and the end 14a of the lever 14 Will be struck very slightly by the cam at each revolution thereof.

In order to provide a seal for the clearance between the cylinder and the piston which will not onlyseal'the same against leakage of pressure but. lubricate the parts so that little resistance is offered to the action of the spring 28' and the cam 12, Iprefer to fill the casing 15 about half full of a good heavy lubricating oil such as castor oil. Thus might mix with the gasoline. In order to prevent the lubricating oil from splashing up through the opening in the plate 17 into the hollow member 19,"I have found it preferable to provide a gasket 16a between the flange 16 and the .cover plate 17 which is large enough to cover the whole end of the casing 15 and have a hole just large enough to permit the rod to pass easily therethrough.

I have also found that in the normal operation of the pump-there is a tendency to produce some noise, due to the fact that the high part of thecam 12 strikes against the end 14a of the lever arm 14, and to prevent this noise, I prefer to insert in the end 14a a strip of fibre or other soft-material 145 which may be held in place in a dovetail slot in the end of the leverarm. l

I It may also be desirable to provide a means tolubricate the pivot 32 of the lever arm 14 as well as the pivot 31 at the end thereof. In order to accom lish this, I contemplate providing a conduit 31a extending through the lever arm 14 and in which maybe threaded a wick 32a. This wick terminates near the end of the lever where it comes in contact.

with the oil in the crank case 10 which oil is drawn by'capillary attraction to the

pivots

32 and 3 1.

In Figures 7 and 9 inclusive I have shown a modification of the pump wherein the pump chamber is ormed by bellows 51 which may T33 be formed f a metallic tube having corru-.

gated walls. The bellows 51 may be attached to the inner end of a casing 52 which has an open outer end adapted to be closed by the cover plate 53. As will be apparent one side of the casing 52 near the open end thereof is extended to rovide a housin 55 for a lever arm 56 whic is pivoted to t e casing at 57 and contacts at its upper end with the bellows 51. The lower end of the lever 56 is pivoted at 58 to a push rod 59 which extends through an opening in the cover plate 53. The cover plate 53 is built up around the push rod opening .to form a sleeve 60 through which the push rod 59 extends and has lateral movement. A flange 61 is provided at the end of the sleeve 60 by means of which the entire pump structure maybe attached to the side of the crank casing 10a in a manner similar to the attachment shown in Figs. 1 and 2. The inner end of the casing 52 may be built up to form a cylinder 62 to extend into the bellows 51 and limit the size of the pumping chamber formed therein. The cylinder 62 may be drilled out to fit a plug 63 attached to the outer end of the bellows 51 and to provide a guide therefor. A conduit 65 is provided which permits fluid to pass into the cavity formed in the cylinder 62 so that there will be no resistance to the movement of the plug 63 as the bellows 51 expands and contracts. It may be desirable to provide a spring 66 inside the cavity in the cylinder 62 to urge the be1lows51 toward its expanded position and in this case it may be also found desirable to provide a second spring 67 between the cover plate 53 and the end of the lever arm 56 to urge the lever arm and bellows inwardly and the push rod 59 outwardly against the cam 12a. I With some forms of bellows, however, the pump has been found to work just as well 1 without the use of the springs above referred Inlet and outlet connections are provided for this modification of the invention in the following manner; two dome-shaped

tubular chambers

68 and 69 are cast integrally with the end of the casing 52 and the chamber 68 has an opening 70' communicating with the interior of the bellows 51. The lower end of the chamber 68 is open and threaded to receive the inlet connection 71 in which may be mounted the inlet check valve 72, any suitable valve being used for this purpose. A conduit 73 is provided connecting the two

chambers

68 and 69 at the lower end thereof and a plug 74 is adapted to fit in the opening at the bottom of the chamber 69 this plug having a conduit 75 passing horizontally therethrough to connect with the conduit 73 between the

chamber

68 and 69. A vertical conduit 76 is provided in the plug 74 communicating with the conduit 75 and upon the top of which the outlet valve 77 may be mounted. The plug 74 is preferably attached to a flange 78 on the lower end of the chamber 69 by two screws 79 and inasmuch as the conduit 75 extends completely through the plug 7 4, the plug may be inserted into the chamber 69 in any way as long as the screws 79 match up with the threaded holes provided therefor.

- side of the chamber 69 and may be threaded to receive the outlet pipe carrying the gasoline to the carburetoi The operation of this modification of the invention is substantially the same'as that already described and need not be repeated here.

It may be found desirable to provide a bellows similar to thatdescribed in the patent to S.- F. Arbuckle, No. ,1,367,792. The construction of this bellows is indicated in Fig. 10 and the operation thereof would be similar to that of the bellows 51 illustrated in Fig. 7.

It is evident that many modifications and changes may be made in the construction illustrated in the drawings and I do not therefore, desire to limit myself to the specific construction shown, but to interpret the invention broadly within the scope of the appended claims. i Having thus described my invention, what I claim is:

l. Ina pumping device, a casing; a cover plate attached to the open end of said casing and having a hollow portion extending beyond said casing at one. side thereof and by which the casing may be attached to the side of an internal combustion engine; a pump within saidcasing comprising a stationary part and a movable part; a lever pivoted within the hollow portion of said cover plate and having one end connected to said movable part and the other end extending through an opening in the side of the engine; and a cam rotated by said engine and adjacent the end of said lever, said pump and lever being so constructed'that the lever is moved away from the cam as the pressure in the pump increases.

2. In a liquid pumping device, a tubular casing; a cover plate for said casing having a hollow extended portion by which the pump is adapted to be attached to a support; a

pump within said casing comprising a stationary part and a movable part; a lever connected to said movable part and pivoted Within said hollow portion of said cover plate and having one end extending beyond. the

end of said hollow portion; an outlet connection for said pump; a chamber adjacent said connection and communicating there wlth to form" an 2111' cush1on, sa1d chamber and connection being adjustable to extend in a-plurality of directions from said casing.

3. In a liquid pumping device, a casing; a cover plate for said casing having a hollow extended portion by which the device is adapted to be attached to a support; a pump within said casing comprising'a stationary part and a movable part; a lever pivoted within the hollow portion of said cover plate and having one end connected to said mov able part and the other-end extending be= yond said hollow portion of said cover plate; means to conduct lubricant from a point adj acent the end of said. lever to the pivot thereof; an outlet connection for said pump comprising a. pipe and an air chamber communicating therewith; and means to adjust said outlet connection to extend in any one of a plurality of directions from said casing.

A. In a liquid pumping device, a casing; a piston within said casing and attached to one end thereof; a cylinder reciprocable upon said piston; means to urge said cylinder to ward its innermost position with respect to said piston; means. comprising a cushioned striking surface attached to said cylinder; and means to repeatedly strike said striking surface to cause reciprocation of 'said cylinder, said first mentioned means having a force directed upon the cylinder equal to the force exerted thereupon by the maximum desired pressure within the cylinder.

' 5. In a liquid pumping device, a casing; a hollow piston within said casing'and attached thereto; a cylinder cooperatmg with said piston to form a pumping action when said cylinder is reciprocated; inlet and outlet conneotions communicating with the interior of said piston; spring means to urge'said cylinder toward one extreme position with respect to said piston; mechanical means comprising a cam and striking plate therefor to intermittently force said cylinder toward the other extreme position, said. striking plate having a cushioned surface and means to seal the clearance space between the cooperating portions of said cylinder and piston.

6. In a liquid pumping device, a cylindrical casing; a hollow piston attached to the lower end of said casing; an inlet connection communicating with the interior of said piston; an outlet connection-comprising an air chamber also communicating with the interior of said piston; means to adjust said outlet connection' to extend in any one of a plurality of directions with respect to said casing; a cylinder adapted to reciprocate upon said piston; means to seal the space between the cooperating sides of the piston and cylinder without appreciably limiting the action of said cylinder; means exerting a force upon said cylinder equal to the maximum desired pressure therewithin tending to urge said cylinder toward one extreme position of its travel; and means mechanically operated to intermittently urge said cylinder toward its other extreme position.

In testimony whereof, I afi'ix my signature.

CLARENCE J. WHITAGRE.