US3765802A - Feed and proportioning pump - Google Patents

Feed and proportioning pump Download PDF

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US3765802A
US3765802A US3765802DA US3765802A US 3765802 A US3765802 A US 3765802A US 3765802D A US3765802D A US 3765802DA US 3765802 A US3765802 A US 3765802A
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Prior art keywords
suction
diaphragm
displacement members
pressure
valve
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W Leitermann
G Maurhoff
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Audi AG
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Audi AG
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00Machines, pumps, or pumping installations having flexible working members
    • F04B43/02Machines, pumps, or pumping installations having flexible working members having plate-like flexible members, e.g. diaphragms
    • F04B43/06Pumps having fluid drive
    • F04B43/073Pumps having fluid drive the actuating fluid being controlled by at least one valve
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01LCYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
    • F01L23/00Valves controlled by impact by piston, e.g. in free-piston machines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M1/00Carburettors with means for facilitating engine's starting or its idling below operational temperatures
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B43/00Machines, pumps, or pumping installations having flexible working members
    • F04B43/0009Special features
    • F04B43/0081Special features systems, control, safety measures
    • F04B43/009Special features systems, control, safety measures leakage control; pump systems with two flexible members; between the actuating element and the pumped fluid
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B7/00Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0073Piston machines or pumps characterised by having positively-driven valving the member being of the lost-motion type, e.g. friction-actuated members, or having means for pushing it against or pulling it from its seat
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/12Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air
    • F04B9/1207Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being elastic, e.g. steam or air using a source of partial vacuum or sub-atmospheric pressure
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02MSUPPLYING COMBUSTION ENGINES IN GENERAL, WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2700/00Supplying, feeding or preparing air, fuel, fuel air mixtures or auxiliary fluids for a combustion engine; Use of exhaust gas; Compressors for piston engines
    • F02M2700/43Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel
    • F02M2700/4302Arrangements for supplying air, fuel or auxiliary fluids to a combustion space of mixture compressing engines working with liquid fuel whereby air and fuel are sucked into the mixture conduit
    • F02M2700/438Supply of liquid to a carburettor reservoir with limitation of the liquid level; Aerating devices; Mounting of fuel filters
    • F02M2700/4388Supply of liquid to a carburettor reservoir with limitation of the liquid level; Aerating devices; Mounting of fuel filters with fuel displacement by a pump
    • F02M2700/439Supply of liquid to a carburettor reservoir with limitation of the liquid level; Aerating devices; Mounting of fuel filters with fuel displacement by a pump the pump being a membrane pump

Abstract

A feed and proportioning pump is provided for delivering two different liquids in a given proportion by flow volume, and in particular to a pump for delivering fuel and oil to mixturelubricated combustion engines, having two interconnected displacement members executing their suction strokes and their feed strokes simultaneously and arranged in special working chambers communicating with a suction and a delivery line by way of reciprocally acting check valves.

Description

United States Patent [191 Leitermann et al.

[111 3,765,802 [451 Oct. 16,1973

[ 1 FEED AND PROPORTIONING PUMP [75] Inventors: Wulf Leitermann; Gerhard Maurhoff, both of Weckalsulm, Germany [73] Assignee: Audi NSU Auto Union Aktiengesellschaft, Neckarsulm, Germany [22] Filed: July 12, 1971 [21] Appl.-N0.: 161,529

[30] Foreign Application Priority Data July 14, 1970 Germany P 20 34 816.7

[52] US. Cl 417/395, 417/503, 417/521 [51] Int. Cl. F04b 43/06, F04b 45/04 [58] Field of Search 1. 91/47, 51; 417/245 [56] References Cited UNITED STATES PATENTS 1,322,236 11/1919 Fish 1 417/521 2,146,398 2/1939 Lafferty 417/395 2,566,436 9/1951 Waite.. 417/521 2,615,299 10/1952 Holmes 417/395 2,948,116 8/1960 Olander.... 91/51 2,981,058 4/1961 Reed 1 91/47 3,386,388 6/1968 Rosenberg.... 417/507 3,486,416 12/1969 Eastman 91/51 FOREIGN PATENTS OR APPLICATIONS 1,231,933 1/1967 Germany 417/295 Primary Examiner-Wiliam L. Freeh Assistant Examiner-John T. Winburn Att0rneyDavid S.-l(ane et a1.

[57] ABSTRACT 4 Claims, 2 Drawing Figures FAIENIEDucI 16 Ian 3 765L802 FIG. 2 4 2 FEED AND PROPORTIONING PUMP BACKGROUND OF THE INVENTION It has previously been proposed for feed and proportioning pumps that one stroke of two displacement members be effected by spring action and the counterstroke by a controlled transmission medium. A control member, actuable by the displacement members, was provided to turn on the supply of transmission medium at the end of the full stroke (effected by spring action) and shut it off at the end of the full counterstroke (effected by the medium). In the practical embodiment of that feed and proportioning pump, the negative pressure in the intake duct of the engine served as the transmission medium. It has now been found that the running of the pump is delayed at starting by the fact that the negative pressure must first overcome the force of the spring, and this requires a certain amount of time for the negative pressure to build up. An analogous situation obtains also if compressed air used as the transmission medium.

SUMMARY OF THE INVENTION The object of the invention is to improve the feed and proportioning pump of the type specified in such manner as to ensure qucik starting of the pump.

This problem is solved, according to the invention, in that the pump is provided with a chamber having a movable partition dividing the chamber into two parts capable of being connected to a common source of pressure or suction. The partition is, in turn, connected with the displacement members. A bistable valve capable of being actuated by the partition at the end of each complete stroke of the displacement members is also provided for establishing communication of one of the parts of the chamber with the source of pressure or suction at the end of one stroke of the displacement members and interrupting it at the end ofthe counterstroke.

The pump, according to the invention, will start immediately as soon as pressure or suction prevails in one or both chambers, since to start the pump no spring action need be overcome that would otherwise require a certain pressure or suction build-up.

The movable partition is preferably in the form of a diaphragm. In addition, one of the displacement members may also be advantageously formed by a diaphragm, bounding the working chamber for one of the liquids to be handled on one side and the chamber in which the movable partition is arranged on the other side. Inasmuch as the diaphragm acts as a displacement member, it is required to have a smaller effective area than the diaphragm acting as a partition, in order to get the necessary area differential to bring about the stroke through the suction prevailing in the part of the chamber in question.

If the pump according to the invention is employed as a mixture pump to deliver fuel and oil to the carburetor of a combustion engine, the actuation may occur where at high suctions and low flow volume a comparatively high liquid pressure will be built up, which may cause the float housing to overflow because of failure of the float needle valve to close tightly. To avoid this, the part of the chamber between the two membranes may be connected with the atmosphere by way of a negative pressure valve. This will limit the suction in that part of the chamber, and hence the delivery pressure, to a certain valve. In this instance, in order to avoid excessive loss of suction, it has proven expedient to connect the part of the chamber between the two diaphragms to the source of suction by way of a throttling means.

The other part of the chamber is alternately connected by the bistable valve to the source of suction and to the atmosphere at the end of each full stroke. The bistable position of the valve is produced by a U- shaped snap spring fixed to the diaphragm forming the partition. This spring has bends directed towards each other near its ends to cooperate with the cam attached to the valve. This spring brings the valve to a first position at which communication is established between part of the chamber with the atmosphere; and it shuts off communication with the source of suction at the end of a stroke, holding it in that position until the end of the next stroke, and then it brings the valve into the other position.

BRIEF DESCRIPTION OF THE DRAWINGS An embodiment of the invention will be described below by way of example with reference to the drawings.

FIG. 1 shows a sectional view FIG. a fuel-oil proportioning pump according to the invention, with the valve in one position; and

. FIG. 2 repeats a portion of Fig. l with the valve in the other position.

In the drawing, a multipartite pump housing 1 has two working chambers 2 and 3. Chamber 2 is bounded by a disphragm 4 connected with a piston 5 displaceable in chamber 3. A fuel supply line 6 closed by a check valve 7 opens into chamber 2. A feed line 8 closed by a second check valve 10 extends from chamber 2 and opens into a mixing chamber 9. An oil line 11 closed by a spring-loaded shut-off valve 12 extends into chamber 3. The'feed line 13 of chamber'3 opens into the mixing chamber 9 and is closed by the same check valve 10 as the feed line 8 of chamber 2. Extending from the mixing chamber 9 is a mixture line 14 leading to the float chamber of the carburetor.

The diaphragm 4 cooperates in defining a motorchamber 15 opposite chamber 2. A diaphragm 16 divides motor chamber 15 into two parts 17 and 18 and is advantageously connected with diaphragm 4 and piston 5. Diaphragm 16 has a greater effective area than diaphragm 4.

A suction line 19 communicating with the intake of the combustion engine or with a negative pressure reservoir opens by way of a branch 20 into chamber part 18 and by way of another branch 21 into chamber part 17. Part 17 is capable of being connected to the atmosphere as well as by means of a line 22. Lines 21 and 22 are capable of being shut off alternately by a valve 23 actuated by diaphragm 16 at the end of each of its strokes. For this purpose, a U-shaped snap spring 24 is attached to diaphragm 16, having bends 25 directed towards each other near its ends to cooperate with a cam 26 mounted on valve 23. Cam 26 forms the end stop for valve 23 in one direction, while the end stop in the other direction is formed by a shoulder 27. As shown, cam 26 is in the form of a disc whose periphery is beveled on both sides. Valve 23 has two constrictions 23a and 23b which alternately open line 21 or line 22, as shown in FIGS. 1 and 2.

A passage 28 extends from chamber part 17 and opens into a chamber 29 bounded by a disphragm 30 connected with the shut-off valve 12.

The mode of operation of the pump shown is as follows:

in the position depicted by FIG. 1, diaphragm 4 and piston 5 are at the end of their delivery stroke, which has been effected by the suction in chamber part 18. Part 17, which during this delivery stroke has been in communication with the atmosphere by way of line 22 (see PK 2,) is now connected to the negative pressure line 19 by the shift of valve 23. The negative pressure pulls diaphragm 16 downwardly and with it diaphragm 4 and piston 5. Simultaneously, spring 24 is spread by cam 26. Fuel now flows through line 6 and the opened check valve 7 into chamber 2. At the same time, the suction in chamber 29 opens the shut-off valve 12 so that oil can reach chamber 3 by way of line 11. At the end of the down stroke, the bends 25 snap over cam 26, abruptly shifting valve 23 into its other extreme position in which the shoulder 27 is in contact with the housing (FIG. 2). This shuts off passage 21 and opens passage 22, so that the negative pressure now acting in chamber part 18 can move diaphragm l6 upwardly and with it diaphragm 4 and piston 5. At the same time, the shutoff valve 12 is closed by spring action,

The delivery stroke of diaphragm 4 and piston 5 now takes place, and the liquid previously drawn into chambers 2 and 3 is supplied through the opened check valve into mixing chamber 9 and thence through mixture line 14 to the carburetor. If the float needle of the carburetor has shut off the feed line, diaphragm 4 and piston 5 will stop in an intermediate position until the float needle has opened the feed line again, whereupon the delivery stroke will be completed by the suction in chamber part 18. Only at the end of the delivery stroke will valve 23 be forced back by snap spring 24 into the position shown in FIG. 1, thereby shutting off the vent line 22 and opening the negative pressure line 21, so that a complete suction stroke can be executed once more.

In order to avoid the occurrence of too high a delivery pressure, which the float meter cannot withstand and which would flood the float housing, chamber part 18 is conveniently connected to the atmosphere by way ofa negative pressure valve 31. This valve 31 limits the maximum suction in chamber part 18 to a certain valve. To avoid excessive loss of suction at high negative pressures, a throttling means 32 is provided in branch line 20.

Thus, the several aforenoted objects and advantages are most effectively attained. Although a single somewhatpreferred embodiment has been disclosed and described herein, it should be understood that this invention is in no sense limited thereby and its scope is to be determined by that of the appended claims.

What is claimed is:

l. A feed and proportioning pump for delivering two different liquids in a given proportion by flow volume and in particular delivering fuel and oil to a mixturelubricated combustion engine, having two interconnected displacement members executing their suction strokes simultaneously and their delivery strokes simultaneously and arranged in individual pumping chambers each communicating with a separate suction line and a common delivery line by way of opposing acting check valves, one of said displacement members being a diaphragm and forming a portion of one of said pumping chambers, a motor chamber on the opposite side of said first diaphragm, a second diaphragm connected to the first mentioned diaphragm and dividing the motor chamber into two spaces capable of being connected to a common source of pressure or suction, said two diaphragms having different effective areas, a bistable valve capable of being actuated by the second diaphragm at the end of each stroke of the displacement members, one of the spaces being between the diaphragms and being continuously connected to the source of pressure or suction during operation'of the pump, said bistable valve establishing communication of the other space to the source of pressure or suction at the end of one stroke of the displacement members and interrupting such communication and establishing communication of that space with the atmosphere at the end of the counterstroke.

2. A pump according to claim 1 wherein the chamber space between the two diaphragms is in communication with the atmosphere by way of a negative pressure valve.

3. A pump according to claim 1 wherein the chamber space between the two diaphragms is in communication with the source of suction by way of a throttling means.

4. A feed and proportioning pump for delivering two particular liquids in a given proportion by flow volume and in particular delivering fuel and oil to a mixturelubricated combustion engine, having two interconnected displacement members executing their suction strokes simultaneously and their delivery strokes simultaneously and arranged in individual pumping chambers each communicating with a separate suction line and a common delivery line by way of opposing acting check valves, one of said displacement members being a diaphragm and forming a portion of one of said pumping chambers, a motor chamber on the opposit side of said first diaphragm, a second diaphragm connected to the first mentioned diaphragm and dividing the motor chamber into two spaces capable of being connected to a common source of pressure or suction, one of the spaces being between the diaphragms and being continuously connected to the source of pressure or suction during operation of the pump, said two diaphragms having differenteffective areas, a U-shaped snap spring attached to the second diaphragm, a bistable valve capable of being actuated by the spring at the end of each stroke of the displacement members, a cam mounted on the bistable valve, the spring having bends directed toward each other near its ends to cooperate with the cam mounted on the bistable valve to move the valve between two positions, said bistable valve establishing communication of the other of said spaces to the source of pressure or suction at the end of one stroke of the displacement members and interrupting such communication and establishing communication of that space with the atmosphere at the end of the counterstroke.

Claims (4)

1. A feed and proportioning pump for delivering two different liquids in a given proportion by flow volume and in particular delivering fuel and oil to a mixture-lubricated combustion engine, having two interconnected displacement members executing their suction strokes simultaneously and their delivery strokes simultaneously and arranged in individual pumping chambers each communicating with a separate suction line and a common delivery line by way of opposing acting check valves, one of said displacement members being a diaphragm and forming a portion of one of said pumping chambers, a motor chamber on the opposite side of said first diaphragm, a second diaphragm connected to the first mentioned diaphragm and dividing the motor chamber into two spaces capable of being connected to a common source of pressure or suction, said two diaphragms having different effective areas, a bistable valve capable of being actuated by the second diaphragm at the end of each stroke of the displacement members, one of the spaces being between the diaphragms and being continuously connected to the source of pressure or suction during operation of the pump, said bistable valve establishing communication of the other space to the source of pressure or suction at the end of one stroke of the displacement members and interrupting such comMunication and establishing communication of that space with the atmosphere at the end of the counterstroke.
2. A pump according to claim 1 wherein the chamber space between the two diaphragms is in communication with the atmosphere by way of a negative pressure valve.
3. A pump according to claim 1 wherein the chamber space between the two diaphragms is in communication with the source of suction by way of a throttling means.
4. A feed and proportioning pump for delivering two particular liquids in a given proportion by flow volume and in particular delivering fuel and oil to a mixture-lubricated combustion engine, having two interconnected displacement members executing their suction strokes simultaneously and their delivery strokes simultaneously and arranged in individual pumping chambers each communicating with a separate suction line and a common delivery line by way of opposing acting check valves, one of said displacement members being a diaphragm and forming a portion of one of said pumping chambers, a motor chamber on the opposite side of said first diaphragm, a second diaphragm connected to the first mentioned diaphragm and dividing the motor chamber into two spaces capable of being connected to a common source of pressure or suction, one of the spaces being between the diaphragms and being continuously connected to the source of pressure or suction during operation of the pump, said two diaphragms having different effective areas, a U-shaped snap spring attached to the second diaphragm, a bistable valve capable of being actuated by the spring at the end of each stroke of the displacement members, a cam mounted on the bistable valve, the spring having bends directed toward each other near its ends to cooperate with the cam mounted on the bistable valve to move the valve between two positions, said bistable valve establishing communication of the other of said spaces to the source of pressure or suction at the end of one stroke of the displacement members and interrupting such communication and establishing communication of that space with the atmosphere at the end of the counterstroke.
US3765802A 1970-07-14 1971-07-12 Feed and proportioning pump Expired - Lifetime US3765802A (en)

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Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923427A (en) * 1974-09-16 1975-12-02 Itt Differential volume pump
US4263602A (en) * 1978-11-30 1981-04-21 Sharp Kabushiki Kaisha Constant flow rate liquid supply pump
US4343596A (en) * 1978-06-29 1982-08-10 Sharp Kabushiki Kaisha Constant flow rate liquid supply pump
US4357617A (en) * 1978-06-29 1982-11-02 Sharp Kabushiki Kaisha Ink recirculating device of ink jet printer
FR2515256A1 (en) * 1981-10-23 1983-04-29 Outboard Marine Corp mixed fuel pump and actuated by oil pressure
WO1983004242A1 (en) * 1982-06-04 1983-12-08 M&T Chemicals Inc. Air operated diaphragm pump system
US4473340A (en) * 1981-10-08 1984-09-25 Outboard Marine Corporation Combined fluid pressure actuated fuel and oil pump
US4515537A (en) * 1981-09-03 1985-05-07 Grunbeck Wasserauebereitung Gmbh Dosing pump
US4523903A (en) * 1982-03-24 1985-06-18 Grunbeck Wasseraufbereitung Gmbh Dosing pump
US4539949A (en) * 1981-10-08 1985-09-10 Outboard Marine Corporation Combined fluid pressure actuated fuel and oil pump
US4551076A (en) * 1983-10-07 1985-11-05 Outboard Marine Corporation Fluid driven pump with one-way valve in fluid inlet
US4552101A (en) * 1983-02-07 1985-11-12 Outboard Marine Corporation Fluid pressure actuated motor with pneumatically-coupled pistons
US4573932A (en) * 1984-02-08 1986-03-04 Outboard Marine Corporation Electrical fluid pumping device including first and second pumping portions
US4594970A (en) * 1985-02-11 1986-06-17 Outboard Marine Corporation Marine installation including fuel/oil mixing device
USRE32577E (en) * 1983-10-07 1988-01-12 Outboard Marine Corporation Fluid pumping device for use with a fluid pump
US4807573A (en) * 1987-08-15 1989-02-28 Andreas Stihl Fuel injection arrangement for a two-stroke engine
US5470305A (en) * 1993-04-19 1995-11-28 Stryker Corporation Irrigation handpiece with built in pulsing pump
US6213970B1 (en) 1993-12-30 2001-04-10 Stryker Corporation Surgical suction irrigation
US6746419B1 (en) 1993-04-19 2004-06-08 Stryker Corporation Irrigation handpiece with built in pulsing pump
US20040115074A1 (en) * 2000-09-29 2004-06-17 Sven Huber Device for generating a reducing agent/air mixture
US20050034711A1 (en) * 2003-08-04 2005-02-17 Yoshikazu Yamada Fuel supply control system for engine
FR2862105A1 (en) * 2003-11-07 2005-05-13 Stephane Urrutia Hydraulic motor for metering pump, has enclosure in which two bellows are placed to delimit three chambers, and distributor placed at bellows and operated between admission state and blocking state
WO2005045244A1 (en) * 2003-11-07 2005-05-19 Urrutia Stephane Hydraulic motor having bellows, and metering pump comprising said motor
US20050254971A1 (en) * 2002-04-08 2005-11-17 Ikuo Ohya Electromagnetic vibrating type diaphragm pump
US20060198740A1 (en) * 2005-03-01 2006-09-07 Shinya Yamamoto Diaphragm pump
US7481791B2 (en) 2000-09-11 2009-01-27 Stryker Corporation Surgical suction irrigator
US20090068034A1 (en) * 2007-09-12 2009-03-12 Pumptec, Inc. Pumping system with precise ratio output

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US4383504A (en) * 1981-11-23 1983-05-17 Outboard Marine Corporation Marine propulsion device with mechanical fuel pressure operated device for supplying a fuel/oil mixture
EP0590041B1 (en) * 1991-06-21 1997-04-09 Orbital Engine Company (Australia) Pty. Ltd. A method and apparatus for metering oil for a two stroke cycle internal combustion engine
DE102013205773A1 (en) * 2013-04-02 2014-10-02 Bayerische Motoren Werke Aktiengesellschaft Fuel pump unit
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US2566436A (en) * 1947-10-11 1951-09-04 Cleveland Detroit Corp Beverage dispensing machine
US2615299A (en) * 1948-10-13 1952-10-28 Curtis Mfg Co J Vacuum booster for internal-combustion engines
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US2948116A (en) * 1959-05-25 1960-08-09 Marquardt Corp Fluid actuated toggle mechanism
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Cited By (38)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3923427A (en) * 1974-09-16 1975-12-02 Itt Differential volume pump
US4343596A (en) * 1978-06-29 1982-08-10 Sharp Kabushiki Kaisha Constant flow rate liquid supply pump
US4357617A (en) * 1978-06-29 1982-11-02 Sharp Kabushiki Kaisha Ink recirculating device of ink jet printer
US4263602A (en) * 1978-11-30 1981-04-21 Sharp Kabushiki Kaisha Constant flow rate liquid supply pump
US4515537A (en) * 1981-09-03 1985-05-07 Grunbeck Wasserauebereitung Gmbh Dosing pump
US4539949A (en) * 1981-10-08 1985-09-10 Outboard Marine Corporation Combined fluid pressure actuated fuel and oil pump
US4473340A (en) * 1981-10-08 1984-09-25 Outboard Marine Corporation Combined fluid pressure actuated fuel and oil pump
FR2515256A1 (en) * 1981-10-23 1983-04-29 Outboard Marine Corp mixed fuel pump and actuated by oil pressure
US4523903A (en) * 1982-03-24 1985-06-18 Grunbeck Wasseraufbereitung Gmbh Dosing pump
US4500264A (en) * 1982-06-04 1985-02-19 M&T Chemicals Inc. Air operated diaphragm pump system
WO1983004242A1 (en) * 1982-06-04 1983-12-08 M&T Chemicals Inc. Air operated diaphragm pump system
US4552101A (en) * 1983-02-07 1985-11-12 Outboard Marine Corporation Fluid pressure actuated motor with pneumatically-coupled pistons
US4551076A (en) * 1983-10-07 1985-11-05 Outboard Marine Corporation Fluid driven pump with one-way valve in fluid inlet
US4555221A (en) * 1983-10-07 1985-11-26 Outboard Marine Corporation Fluid pumping device for use with a fluid pump
USRE32577E (en) * 1983-10-07 1988-01-12 Outboard Marine Corporation Fluid pumping device for use with a fluid pump
US4573932A (en) * 1984-02-08 1986-03-04 Outboard Marine Corporation Electrical fluid pumping device including first and second pumping portions
US4594970A (en) * 1985-02-11 1986-06-17 Outboard Marine Corporation Marine installation including fuel/oil mixing device
US4807573A (en) * 1987-08-15 1989-02-28 Andreas Stihl Fuel injection arrangement for a two-stroke engine
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Also Published As

Publication number Publication date Type
FR2101594A5 (en) 1972-03-31 application
DE2034816A1 (en) 1972-01-20 application
GB1296334A (en) 1972-11-15 application

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