US2570560A - Universal combination fuel and vacuum pump - Google Patents

Description

Oct. 9, 1951 M. KATCHER UNIVERSAL COMBINATION FUEL AND VACUUM PUMP 4 Sheets-Sheet l Filed Jan. 3l, 1946 Oct. 9, 1951 M. KATCHER UNIVERSAL COMBINATION FUEL AND VACUUM PUMP 4 Sheets-Sheet 2 Filed Jan. 3l, 1946 INVENToR /aee/f 51704/5161 ATTORNEY Oct. 9, 1951 M. KATcHER UNIVERSAL.v COMBINATION FUEL AND VACUUM PUMP 4 Sheets-Shea?l 3 Filed Jan. 3l, 1946 lNvENToR Mee/.v Kira/ff?.

BYMQI, ATTORNEY M. KATCHER UNIVERSAL. COMBINTION FUEL AND VACUUM PUMP oct. 9, 1951 4 Sheets-Sheet 4 Filed Jan. 5l, 1946 INVENToR Mee/f /f/arf//fe ATTORNEY Patented Oct. 9, 1951 AUNITED STATES PATENT OFFICE UNIVERSAL COMBINATION FUEL AND VACUUM PUMP Morris Katcher, New York, N. Y.

s Application January 31, 1946, Serial N0. 644,535

10 Claims. V(Cl. 103-6) This invention relates to a universal combination fuel and Vacuum pump for usewith internal combustion engines. Motors in use at present require, in some instances, the location of the fuel pump on top and the vacuum pump on the bottom and in corresponding situations all connections from the fuel tank to the carburetor via the pump as well as connections from the accessories, such as the windshield wiper, to the intake manifold via the pump. In the case of other motors conditions are reversed, the motors and said connections requiring a combined pump in which the fuel pump part is on the bottom and the vacuum pump part on the top. To satisfy both conditions, it has been necessary, heretofore cordingly, it is an object of the present invention to provide a combination pump which will suit both of the conditions noted above, which pump does not require special skill and fittings to install, no matter which way it must'be installed, that is either with the fuel pump on top or the vacuum pump on top.

A further object, as an aid to the universality of the pump, is the provision of a detachable mounting or supporting bracket which is of such symmetry that it may be reversed with respect to the engine casing or the pump body. The provision of a plurality of sets of holes in the bracket and corresponding holes in the connecting flange on the pump body, permits the mounting of the pump on a number of different engines instead of requiring specially holed pumps for said different engines. Such a bracket could be standard for a group of motors, special brackets only being required for groups of motors, instead of individual types of motors. Y

To make it possible that the pump operate efficiently in reversed positions, provision is made that the inner end of the operating lever is in such operative relation to the means connected to the diaphragms for eiecting their strokes and the diaphragms themselves, that it reciprocates or rocks from a mean position which is suitable for either the fuel pump diaphragm` or the vaccum pump diaphragm, no matter which dia-v phragm is on top. The inner end of the operating lever must bear a constant relation to the diaphragms, even if it be necessary that its outer end be varied to suit the driving means of the particular engine with which the pump is to be used. Further, the outer end of the operating lever should also be in a different relation to the driving means or cam where the combination pump is mounted with the fuel pump diaphragm on top than from ywhere said diaphragm is on the bottom of the combination pump.

Another object of the invention is the provision of a strainer or filter for the fuel, which strainer is operative in an upright position or in an inverted position Without any change or adjustment. The strainer is on line or substantially coaxial withY the diaphragme. A further object of the invention resides in the novel construction of the pump housing to provide for gasoline leakage and the entrance of oilv into the pump housing, whether the pump is in upright or inverted position. The gasoline is led to the outside of the pump housing to prevent it from entering the engine crank case while the oil is allowed to return to the latter. "Another object is the use of an operating lever in one unit from the eccentric rocking it to the parts connected to the diaphragms for reciproeating them. Said parts are in axial alignment and engage the lever with a lost motion connection. The parts are kept separate from each other with the lever between them, instead of telescoping into each other as shown in my application Serial No. 633,333. This obviates any likelihood of the parts binding on each other.

A novel arrangement of breather hole construction is provided for the interior of the pump housing between the diaphragms, which arrangement permits inversion of the pump and no loss of oil without any adjustments of the housing at the breather hole. In another type, said inversion requires only the adjustment of a small plate.

Other objects and advantages will become apparent upon a further study of the description and drawings, in which: Y Fig'. V1 is a longitudinal section through the pump with the fuel pumping mechanism on top andthe vacuum pumping mechanism below.

Fig. 2 is a front elevation of the pump set as in Fig. 1.

'.Fig. 3 is a partial section along the line 3 3 of Fig. 1.

. Fig. 4 is a plan view taken along the line 4--4 of Fig. 1, with the drain bowl, baie and screen removed.

Fig. 5 is a sectional plan taken looking up along the broken line 5 5 of Fig. 1.

Fig. 6 is a sectional plan taken along the broken line 6--6 of Fig. 1.

Fig. 7 is an elevation in partial section of the pump shown inverted and turned 180 degrees from its position of Fig. 1, the outside portion of the operating lever being of different form.

Fig. 8 is a longitudinal section of the central body portion or intermediate member of the pump housing shown with diaphragms attached and an alternate arrangement of the operating lever hookup and breather holes.

Fig. 9 is a partial section taken along the line -9 of Fig. 8.

Fig. 10 is a top plan view, partially in section and to a larger scale of the intermediate member of the pump housing of Fig. 8 and turned 180 degrees, showing fuel and oil drain holes.

Fig. 11 is an elevation, partially in section, of the intermediate member of Figs. 8 and 10, and looking to the left in Fig. 10, and

Fig. 12 is a partial section taken along the line I2-I2 of Figs. 10 and 11.

Intermediate member I3, Figs. l to 6, has top flange I4 upon which is mounted fuel pumping diaphragm I5. Fuel diaphragm I5 is held upon flange I4 by the pressure of flange I6 of the fuel pump cover I1, the pressure being induced by screws I8. Fuel pump cover I1 forms the upper wall of fuel pump chamber I9, while its lower wall comprises diaphragm l5. Mounted on top of cover I1 is glass strainer bowl 26, held down on gasket 2I by means of bail 22, nut 23 and screw 24. Cover I1 has a hollow cylindrical portion 25 extending up into bowl 20. At the bottom of portion 25 is an inlet check valve 26 which allows the ow of fuel down from the inside of portion or tubular member 25 into fuel pump chamber I9V but not in the reverse direction. Cover I1 is provided with fuel inlet 21 which can be connected to the fuel tank, not shown, and apassage 28 which receives the fuel from the inlet and delivers it near the top of cylindrical portion 25. An annular flange or baiile 30 is mounted on top of portion 25 so as to surround the latter and is provided with an opening over the open upper end of tubular member 25. Screen 29 is mounted in said opening. Baffle 30 acts to prevent any sludge which may have settled outside of portion 25 from reaching screen 29.

The screen and flange 30 are held down on member 25 by spring 3I, the upper end.of which reacts against the inside top of bowl 20. The fuel from the top of passage 28 flows through screen 26 into the inside of member 25 and through check valve 26 into fuel pump chamber I9 when diaphragm I5 is moved downward, that is, has its suction stroke. Upon the upward or compression stroke of diaphragm I5, the fuel is forced through outlet check valve 32 into passage 33 and then through a second check valve 34, which happens to be in this particular embodiment a ball check valve. From check valve 34, the fuel passes out of the pump through outlet 35 which is usually connected to the carburetor, not shown, of an internal combustion engine. Other out-V lets 36, shown plugged in Fig. 4, are provided to be used instead of outlet 35 when more convenient. The use of the second check valve, as s shown, has been found by experiment to act, instead of the usual air dome, as a pulsation dampener, that is the fuel flows from the pump to the carburetor in a substantially steady stream. The pulsation dampener of this type forms the subject matter of a joint application by William Hicks and myself, Serial No. 619,710 now abandoned.

Vacuum pump diaphragm 31 is clamped to bottom flange 38 of intermediate member I3 by means of screws 39 and flange 4I at the top of vacuumpumpcover. Diaphragm 31 is comprised in one wall of vacuum pump chamber 42 the rest of which is defined by cover 40. A cup-shaped part 43 is formed inside cover 45. An internally threaded boss 44 is formed in the bottom of part 43 for receiving screw 45 which is used to fasten plate 46 to cover 40. Cover 46 is provided with an inlet 41 and an inlet check valve not seen which are in communication with vacuum pump chamber 42 by a passage also not shown, such construction being well known to the art. The discharge from chamber 42 passes through outlet check valve 48 and outlet 49. Inlet 41 is adapted to be connected to the vacuum motor of a windshield wiper, not shown.

A readily removable mounting bracket 5|! is held to intermediate member I3 at flange |04 by means of screws 5I, and the bracket in turn is held by bolts 52 to the engine mounting 53, fragmentally shown in dotted lines. Operating lever 54 is pivotally mounted in bracket 50 by means of pin 55, an extension 56 to the bracket on each side thereof being provided as a bearing for the pin. Intermediate member I3 is recessed to receive extensions 56. A readily removable and changeable mounting bracket with its operating lever permits the use of a standard pump body with dii-ferent types of` motors. Suitable brackets and levers are provided to take up the variation in the motors while the pump body remains standard. It is to be noted that the portion of lever 54 within that portion of the housing comprising intermediate member I3 can remain standard, only the outside portion of the lever needing to be varied. This type of bracket and lever forms the subject matter of my pending application Serial No. 600,782 now Patent 2,440,175 dated April 4, 194,8. They 'are also shown in my pending application Serial No. 633,333.

Lever 54, Figs. 1, 2, 3 and 6, is formed of two spaced sheet metal arms 51 joined at their outer end by bridge piece 58 and inside of the housing by a rivet 59. Bridge piece 58 is forced to ride on the surface of cam 01 eccentric 60 by the pressure of spring 6I whose upperend engages member I3. Cam 60 is mounted on shaft |65 which is usually the cam shaft of the motor. Lever arms 51 at their inner end straddle fuel pump diaphragm stem 62 above and come inside of vacuum pump diaphragm stem or shell 63 below. Arms 51 are provided with a notch 65 for their engagement with pin 61 extending through the bottom of stem 52. Notch 65 is elongated vertically to allow for lostmotion of pin 61 with relation to lever 54. Arms 51 are each provided with another notch or hook 66 in their bottom edge for engagement with pin 68 which extends across the open end of shell 63.

Diaphragm stem 62 is formed with a rivet 64 at its upper end, the head of said rivet engaging washer 69 which squeezes down plate 10 against fuel pump diaphragm I5. A plate 13 is pinched between diaphragm I5 and the shoulder on top of stem 62. Loosely mounted on stem 62 is channel-shaped washer 1I, said washer being held down against the top of lever 54 by spring 12, the upper end of said spring reacting against plate v'I3 on the underside of diaphragm I5, said together by rivet 11. A spring 18 under predetermined initial compression extends between washer 16 on the bottom of diaphragm 31 and the bottom of part 43, so that normally dia-` t phragm 31 is moved to its upper position in a suction stroke only until the decrease in pressure in chamber 42 is suiiicient to overcome the compression in spring 18.

When lever 54 is rocked by cam 68 so that its inner end is moved down, it bears down on pin 68 at notches 66 forcing down shell 63 and diaphragm 31 for its compression stroke against the pressure of spring 18. As cam 68 revolves, spring 6| pressing down on bridge piece 58 raises the inner end of lever 54, vreleasing shell 63, allowing thereby spring 18 to push up diaphragm 31 for its suction stroke. The suction developed by the vacuum pump cannot exceed that produced by the strength of spring 18. When the pressure in chamber 42 becomes lower than a predetermined amount, spring 18 is prevented from expanding. Under this condition, when lever 54 is rocked in a counter-clockwise direction, the inner end of lever 54 rises without corresponding rising of shell 63, that is there is lost motionV in the connection of the lever and the shell. .The reason for this is to insure that a vacuum in chamber 42 will not be created below a predetermined absolute pressure.

When lever 54 rocks in a counter-clockwise direction, its inner end pushes up on washer 1| which through the intermediacy of spring "I2 raises diaphragm I5 for its compression stroke. Washer 1| is limited in its downward motion relative to stem 62 by pin |86 set in said stern. Pin |86 is provided to retain washer 1| during assembly. When lever 54 rocks in a clockwise direction its inner end solidly presses down on pin 61 effecting the suction stroke of diaphragm I5. As in my application Serial No. 633,333, springs 12 and 18 can act in opposite directions on lever 54. In fact at times, one spring will help the lever overcome the resistance of the other-spring, as just after lever 54 has finished its compression stroke on Vacuum pump diaphragm 31 and started to yrock in a counterclockwise direction, spring 18 which had been compressed during the compression stroke will recover, forcing up diaphragm 31 and with it shell 63 and pin 68 against lever 54, assisting the latter in pressing against spring 12. In Fig. 1, both diaphragms I5 and 31 are at the upper limit of their stroke, vcompression stroke for diaphragm I5 and suction stroke for diaphragm 31. This means that the pressure in fuel pump chamber I9 and fuel line 19 which is connected to the carburetor, not shown, is less than that required for spring 12 to yield, and that pin 61 is at the upper edge of notches or slots 65. It also means that the vacuum created in vacuum pump chamber 42 is not great enough to hold back diaphragm 31 against the force of spring 18 so that pin 68 contacts the bottom of lever 54. Should the pressure in fuel pump chamber I9 in a subsequentacompression stroke of diaphragm I5 be great enough to overcome the initial compression in spring 12, the inner end of lever 54 will rise without corresponding rising of stem 62, so that pin 61 will be located in slots 65 below their upper edge. In other words, there will be lost motion between lever 54 and stem 62. Under this condition, upon subsequent clockwise motion of lever 54, spring 12 will help push the lever4 down against the resistance of spring 18 until the top of slots 65 engage pin 61. The reciprocation of diaphragm I5 by lever 54 through the intermediacy of spring 12 is also described in my applications Serial Nos. 600,782 and 633,333. The length of slot 65 is sufficient to permit this lost motion, as is the normal spacing of the end of stem 62 and pin 68.

Both washer 1| and shell 63 are guided in their reciprocation by cylindrical Walls 8| extending between housing Wall 89 and lug wall 88. Wall 88 is provided with an internally threaded lug 82 for receiving screw 83 which is used to fasten plate 81 to the rear of member I3. A breather hole 88 is provided in the upper portion of plate 81 to maintain the interior of member I3 at at-v mospheric pressure during the reciprocation of the diaphragms.

As there is a possibility for gasoline to leak into the conned space below diaphragm I5, Fig. 1, in case of a small break in said diaphragm (by itself insuiicient to prevent the pump from further functioning) provision is made to prevent it from running back into the engine crank case 53. Accordingly, upper cylindrical wall 8|, when the fuel pumping mechanism is on top as shown in Figs. 1 and 2, is used as a dam to hold the gsaoline until it can drain through small holes 84, Figs. 2 and 6, to the outside of the pump housing on a side of it away from where lever 54 extends. The smallness of holes 84 prevents substantial escape of oil.

When the pump is inverted, as shown in Fig. 7, fuel pump diaphragm I5 is on bottom, but due to the pumping action, gasoline may enter the confined space in the housing above it and drain through holes 85 to the `outside of the housing on a side of it away from where lever 54 extends. See also Figs. 10, l1 and 12. But oil, also, by splash from the engine, may enter said space above the fuel pump diaphragm and try to escape with the gasoline through holes 85. However, the amount of oil, due to its greater viscosity, escaping this way will be small because holes 85 are small. But the gasoline will escape, because as it wells up from the bottom, it will dilute the oil in its path and run out holes 85. On the other hand, because the oil cannot escape except slowly, it will continue to accumulate until it reaches large holes 86 from whence it will ow back into the engine crank case.

When the pump is reversed as shown in Fig. '1, it is necessary to reverse plate 81 so that its breather hole 88 is on top, in this case adjacent vacuum pump diaphragm 31, instead of fuel pump diaphragm I5 as in Fig. 1. With the pump in reversed position. a different shaped operating lever 98 is required from pivot pin 55 outward to eccentric 9|. Inward to pins l61 and 68, lever 98 may be the same as lever 54, Fig. 1. With fuel pump diaphragm I5 on the bottom,.Fig. 7, operating lever 98 is given a positive push for clockwise rotation, its return stroke being effected by spring 92, while with fuel pump diaphragm I5 on the top, Fig. 1, operating lever 54 is given a positive push for counterclockwise rotation, considering the pump of Fig. r`1 rotated about a vertical axis so that eccentric 68 is on the right as shown in Fig. '1. When lever 98, Fig."1, is given a clockwise rotation by cam 9|, its inner hooked end solidly engages pin 68 of diaphragm stem 63, effecting the compression stroke ofl vacuum pump diaphragm 31 againstthe resistance of -spring 76. When given clockwise rotation, the hooked end of lever 9@ also solidly engages `pin el of diaphragm stem 62, effecting the suction stroke of fuel pump diaphragm l5. 'Upon the return or counter-clockwise stroke of lever 9e, which is effected by spring 912, the hooked end of said lever moves down away from pin 6&2, permitting spring 'I8 to ycause the vacuum stroke of vacuum pump diaphragm 3l'. When the vacuum is sufliciently low, spring 'I8 has not sufficient strength to push down diaphragm 3l, and hence the hooked end of lever 9B moves away from pin 63, resulting in lost motion upon the clockwise stroke of the lever. Similarly, upon the counter-clockwise stroke of lever 96, its hooked end moves down away from pin 6l, provided spring i2 permits it, that is, if the pressure in feed line i9 is high enough to overcome the compressive strength of said spring. This results in lost motion between lever 99 and pin B7 upon the compressive stroke or clockwise motion of the lever.

Further, intermediate member I3 is so constructed in spatial relation to the operating mechanism, as in my application Serial No. 633,333, that the operating levers will give the required strokes to diaphragms i and 3l' no matter whether intermediate member I3 is turned upside down just by itself from its position shown in Fig. 1 or in its modified form shown in Fig. l1 with fuel pump diaphragm i5 remaining on top, or whether the entire pump is turned upside down vwith diaphragm i5 coming on the bottom. Where intermediate member i3, Fig. l, or intermediate member 93, il, is so constructed that it may be turned upside down by itself, it must be the same at its top flange ifi as it is at its bottom flange 32. In this case fuel pump diaphragm I5 is the same size as vacuum pump diaphragm 3l. While this is the preferred construction, by Vlimiting the `symmetry of the operating mechanism to the intermediate member only as far as the strokes of the 'lever and the diaphragms are concerned, it is possible to use a fuel pump diaphragm of different diameter from that of the vacuum pump diaphragm. However, in the latter case, Ythe pump as 'a whole must be inverted. 1n said latter case, the mean position of the strokes of the inner Yend of the operating lever is Substantially equally distant from the mean positions of the strokes of the diaphragms when the strokes of the latter have their maximum amplitude. The maximum amplitude of the stroke of diaphragm I5 occurs when the pressure in fuel chamber 'I9 is 4less .f

than enough to cause spring 'i2 to shorten during the com-pression stroke. The maximum amplitude of the stroke of diaphragm Si occurs when the vacuum in vacuum chamber isnot low enough to overcome the pressure of spring 58.

When the pump is inverted, as shown in Fig. 7, strainer bowl of course, is inverted. The iiow of fuel through the strainer can be traced with bowl 29 in this position by inverting Fig. l. Fuel enters inlet 2l, and then passes down passage V28, past bafe 3B and then up through screen A29 into cylindrical portion `or tubular member 25.` From portion 25, the fuel passes through inlet check valve 26 into Achamber I9 and out from said chamber as previously described in connection with Fig. l. Any `sediment separated out from the fuel by screen 29, will settle to the bottom of bowl 29, that is the bottom of said bowl as viewed in Fig. 7 or with 1 upside down. Enough space is provided S1 between the screen 29 and 'the'bottom of bowl 20 for a substantial amount of sediment. .It .is thus seen that a strainer is provided in line with diaphragms I5 and 3l which is operative in erect and inverted positions, requiring no change or adjustments in the pump to suit either position.

In Figs. 8-12 is .shown an operating lever 94, l'eciprocated by eccentric 9| reacting against spring 92, said lever having a special detail at its inner end for engaging pins 67 and shell or stem il?. of Vthe 'diaphragm reciprocating mechanism. Intermediate .member 93 is in general the same as member i3 of Figs. l and '7, except that there are specially constructed breather holes 95 and 91.

Referring to Figs. 8 and 9, it is seen that the two side arms 98 of lever 94 have fastened between them by rivets 99 a solid hook block IUS which carries a pin I IU projecting from it, said pin engaging notch II I in shell II2. The diaphragm reciprocating mechanism is the same as before, stem 62 and spring l2 reciprocating diaphragm I5 and shell II2 and spring I8 reciprocating diaphragm 3`I. Washer 1i and shell H2 are guided in their reciprocation by wall IliI of the housing which extends like a dam and for a similar purpose as wall r8I,`1"ig. 1. However in order to form passages |62 .leading to breather holes 96 and 91, U-shaped walls |03, Fig. 10, are formed on wall IDI. Wall H13 in conjunction with the adjacent portion of wall II forms a tube defining passages I2. Breather hole 96 and its passage |02 communicate withthe space under diaphragm 3l, Fig. 8, while breatherrh'ole 97 and its passage |02 communicate with the space above diaphragm I5. When lever 94, Figs. 8 and 9, is given a clockwise rotation by cam 9|, its pin I I solidly engages a corresponding notch in diaphragm stem II2, effecting the compression stroke of vacuum pump diaphragm 3'! against the resistance of spring T8. When given clockwise rotation, the hooked portion of the inner end of lever 94 solidlyl engages pin 61 of diaphragm stem 62, effecting the suction stroke of fuel pump diaphragm I5. Upon the return or counter-clockwise stroke of lever 94, which is effected by spring 92, pin IIS moves down away from the notch in stem II2, permitting spring '8 to cause 'the vacuum stroke of vacuum pump diaphragm 31. When the vacuum is suiciently low, spring 'I8 has not suicient strength to push down diaphragm 3l, and hence pin IIB moves down away from stem II2, resulting in lost motion upon the clockwise stroke of the lever. Similarly, upon the counter-clockwise stroke of lever the Vhooked portion of its inner end moves down away fromV pin El, provided spring 'I2 permits it, that is if the pressure in the fuel pump chamber Aunder diaphragm I5 is high enough to overcome the compressive strength of said spring. This results in lost motion between the hooked portion 'of .lever 913 and pin 61 upon the compressive stroke or clockwise motion of the lever.

I claim:

i. A pump comprising a housing' provided with a .fuel 4pump chamber., :amounting therefor, said pump adapted to be mounted with Vsaid chamber at its lower portion, ay fuel 'pump diaphragm within the housing above the chamber when the p-mp is so mounted, said diaphragm adapted to cooperate with said chamber for pumping the fuel when reciprocated, said housing .being provided with a drain hole in a side away from said mount- 9 ing and above the diaphragm, said hole leading out from the space in the housing above the diaphragm for draining off fuel leaking into "said space,'said hole being suihciently small substantially to prevent escape through it of lubricant of normal consistency, another hole being provided higher up in thev housing in its side at the mounting for draining olf lubricant entering said space, the latter hole being sufficiently large to pass lubricant of normal consistency.

2. In a combined fuel and vacuum pump for use with driving means, a housing providing a ffuel pump chamber and a vacuum pump chamber, a fuel pump diaphragm within'the housing adapted to cooperate when reciprocated with the fuel pump chamber for pumping the fuel,

a vacuum pump diaphragm Within the housing adapted to cooperate whenl reciprocated with the vacuum pump chamber for creating a vacuum, said housing having a plurality of drain holes located above the fuel pump diaphragm Vwhen the latter is at the lower end of the housing, said the space inthe housing above said latter diaphragm, one of said holes being lprovided for4 draining off fuel leakinginto said space, and being suiciently small substantially to prevent escape through it of lubricant of normal consistency, a second hole being located higher up than said first hole and being sulcientlylarge readily to drain olf from said space the lubricant ofr normal consistency reaching it, and a third hole still higher up than the second hole, acting as a drain hole for leaking fuel when the housing is turned to have the fuel pump diaphragm at the upper end, said third hole being sufficiently small to prevent substantially escape through it of lubricant of normal consistency, said second hole when the housing is turned to have the fuel pump diaphragm on top also servM ing to vdrain olf lubricant of ynormal consistency. 3. In. a'combined fuel and vacuum pump a housing providing a fuel pump chamber at one end of the housing, and a vacuum pump chamber at the opposite end of the housing, a fuel pun-1p diaphragm within the housing adapted 'to cooperate when reciprocated, with the fuel pump chamber for pumping the fuel, a vacuum pump diaphragmr within the housing adapted to cooperate, when reciprocated, with the vacuumk pump chamber for creating a vacuum, said housing having a substantially confined space on the side of each diaphragm away from its cooperating chamber, and a tubular member on the housing having one end opening into the space adjacent the fuel pump diaphragm and another end opening into the space adjacent the vacuum pump diaphragm, said member being vented to the atmosphere at a location substantially midway between the diaphragms.

4. In a combined fuel and vacuum pump a housing providing a fuel pump chamber at one end of the housing and a vacuum pump chamber at the opposite end of the housing, a fuel pump diaphragm within the housing adapted to cooperate, when reciprocated, with the fuel pump chamber for pumping fuel, a vacuum pump diaphragm within the housing adapted to cooperate, when reciprocated, with the vacuum pump chamber for creating a vacuum, said housing being open to the atmosphere between the diaphragms, and a removable plate having an opening therein near one end, said plate being reversibly mountable on the housing for closing it 01T from the atmosphere except at said openl0 ing, whereby the opening can be located nearer to one diaphragm than the other as desired.

5. A combined fuel and vacuum pump comprising a housing provided with a fuel pump chamber and a vacuum pump chamber, a fuel pump diaphragm within the housing adapted to cooperate with the fuel pump chamber, a vacuum pump diaphragm within the housing adapted to cooperate with the vacuum pump charnber, a separate part connected to each diaphragm for effecting the reciprocation of the latter, the part connected to one diaphragm extending toward the other diaphragm, said parts being substantially in axial alignment, and axially spaced from each other, an operating lejver pivotally mounted on the housing adapting the lever to be given a rocking motion, said lever having an outer end projecting outside of the housing and an inner endl inside of the housing, the inner end of the lever extending between and, when rocked, actuating ysaid parts, said inner end and said parts being formed and provided with suitable clearance between themto provide a lost motion connection between the lever and said parts, effecting a suction stroke and a compression stroke ofthe fuel pump diaphragm only up to a predetermined pressure in the fuel chamber, and a compression strokeand and a suction stroke of the vacuum pump diaphragm only down to a predetermined pressure in the vacuum pump chamber.

6. A pump having a housing providing a fuel s pump chamber and a vacuum pump chamber,

tion, an operating lever pivotally mounted on l the housing adapting the lever to be given a rock- -ing motion, said lever having an outer end pro jecting outside of the housing and an inner end inside of the housing, the inner end of the lever being provided with hooked ends, a laterally ex- -tending projection provided on each of Ysaid diaphragm parts in line with said hooked ends-and axially spaced from each other, said hooked ends being in axial spaced relation to engage the spaced projections on said parts, one hooked end adapted to engage one of the projections and the other hooked end adapted to engage the other of said projections, the open side of each hooked end facing away from the fuel pump diaphragm and when moved in the direction of said facing effecting the suction stroke of the fuel pump diaphragm and the compression stroke of the vacuum pump diaphragm by engaging its corresponding projection.

'7. A combined fuel and vacuum pump comprising a housing provided with a fuel pump chamber and a vacuum pump chamber, a fuel pump diaphragm Within the housing adapted to cooperate with the fuel pump chamber, a vacuum pump diaphragm within the housing adapted to cooperate with the vacuum pump chamber, a part connected to each diaphragm, movably mounted for axial motion in the housing, said parts being substantially in axial alignment, and

axially spaced from each other, an operating the housing, and an inner end inside of the housing, the inner end of the lever extending between and actuating said parts to effect the reciprocation of the diaphragms, the inner end of the lever and the diaphragm parts being formed and provided with suitable clearance between them to provide a lost motion connection'between the lever and said diaphragm parts, lthe space between the diaphragm parts whensaid parts are positively engaged by the lever being suicient to provide for the lost motion between the lever and the part Yconnected to the fuel pump diaphragm.

8. A combined fuel and vacuum pump comprising a housing provided with a fuel pump chamber and a vacuum pump chamber, a fuel pump diaphragm within the housing adapted to cooperate with the fuel pump chamber, a vacuum pump diaphragm within the housing adapted to cooperate with the vacuum pump chamber, a part for each diaphragm movably'mounted in the housing and connected at one end'to its diaphragm, said parts being substantially in axial alignment, with theirother ends facing eachother in axially spaced relation, an operating lever pivotally mounted on the housing adapting the lever to be given a rocking motion, said lever having an outer end projecting outside of the housing, and an inner end inside of the housing, the inner end of the lever Vbeing provided with a vhooked portion and a projection in axially spaced relation to the hooked portion, the ends of said parts being suitably formed to have one of them engaged bysaid hooked portion and the other of them engaged by said projection, the'open end `of the hooked portion facing away from the fuel pump diaphragm and adapted solidly to engage the part connected to the fuel pump diaphragmfor effecting its suction stroke, the projection being adapted solidly toengage the part connected to the vacuum pump diaphragm for effecting its compression stroke.

9. A fuel pumpcomprising a housing, a mount'- ing therefor, said housing being provided with a fuel pump chamber in its lower portion, a fuel pump diaphragm mounted in the" housingto form the upper wall ofsaid chamber, said'diaphragm, when reciprocated, adapted to cooper'- A ate with the chamber for pumping fuel, said housing being provided with a drain hole from itsspace above the diaphragm to the outside of the housing, said hole being sufficiently small substantialh7 to prevent escape through .it of lubricant of normal consistency, the fuel diluting the lubricant at the hole to permit said fuel to escape, and a second and larger hole at the mounting at a higher elevation than the first hole for draining off any lubricant reaching the interior of the housing above the diaphragm.

10. A combined fuel and'vacuum pump comprising a housing provided with a fuel pump chamber and a vacuum pump chamber with a space in the housing between said chambers, a fuel pump diaphragm within the housing adapted when reciprocated to cooperate with the fuel pump chamber to pump fuel, a vacuum pump diaphragm within the housing adapted when reciprocated to cooperate with the vacuum'pump chamber to create a vacuum, said housing being provided with a drainY hole from thevlower portion of its space between the diaphragms` to the outside of the housing, said hole being Vsufficiently small substantially to prevent escape through it of lubricant of normal consistency, the fuel diluting the lubricant at the hole to permit said fuel to escape, and a second hole and larger hole in the housing at the lower portion of said space, but at a higher elevation than the first hole for draining off any lubricant reaching said space. v

MORRIS KATCHER.

EFERENCES CITED The following references are of record in the ile of this patent:

UNTED STATES VPATENTS Number Name Y Date 2,018,153- Schulze VOct'. 22', 1,935 2,036,452 Babitch er, al Apr. '7, 1936 2,079,406 Harry May 4, 1937 2,183,421 Brady Dec. l2, 1939 2,440,175 Katcher Apr. 4, 1948 FOREIGN PATENTS Number Country Date 71,459 VSweden 1929

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