EP1992818A1 - Pompe à piston alternative fonctionnant sur un support de pression - Google Patents

Pompe à piston alternative fonctionnant sur un support de pression Download PDF

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Publication number
EP1992818A1
EP1992818A1 EP07075373A EP07075373A EP1992818A1 EP 1992818 A1 EP1992818 A1 EP 1992818A1 EP 07075373 A EP07075373 A EP 07075373A EP 07075373 A EP07075373 A EP 07075373A EP 1992818 A1 EP1992818 A1 EP 1992818A1
Authority
EP
European Patent Office
Prior art keywords
piston
pump
medium
inlet
plunger
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP07075373A
Other languages
German (de)
English (en)
Inventor
Jan Noord
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to EP07075373A priority Critical patent/EP1992818A1/fr
Priority to US11/901,123 priority patent/US20080286120A1/en
Priority to NO20083599A priority patent/NO20083599L/no
Publication of EP1992818A1 publication Critical patent/EP1992818A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B9/00—Piston machines or pumps characterised by the driving or driven means to or from their working members
    • F04B9/08—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid
    • F04B9/10—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid
    • F04B9/103—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber
    • F04B9/105—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting liquid motor
    • F04B9/1053—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being fluid the fluid being liquid having only one pumping chamber reciprocating movement of the pumping member being obtained by a double-acting liquid motor one side of the double-acting liquid motor being always under the influence of the liquid under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/04—Regulating by means of floats
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/02—Pressure in the inlet chamber

Definitions

  • the invention relates to a reciprocating piston pump operating on a pressure medium.
  • Existing pumps are for example used to transport a medium from a pump inlet connected to a tank to a pump outlet opening. These pumps are driven by a motor that slidably moves a piston of the pump in the cylinder, thereby forming a pressure chamber in the cylinder.
  • the invention now has for its object to provide a reciprocating piston pump which is more efficient and does not require separate drive means.
  • the piston of the pump will slide in the cylinder from a first to a second position by supplying the pump inlet with a pressure medium.
  • Valve members are received or incorporated in the piston itself and are actuated by the actuating means. Therefore, the pressure medium that is brought into the cylinder during the movement of the piston from a first to a second position will be transferred to the other side of the piston during the piston's return from a second to a first position due to the valve members.
  • the first valve member is in an open position mutually connecting the cylinder spaces on either side of the piston.
  • a preferred embodiment of the piston pump according to the present invention comprises a first plunger for uptake of a first medium from a second inlet to a second chamber.
  • the plunger moves from a first to a second position thereby creating an under pressure that will be compensated by uptake of a first medium through a second inlet of the pump.
  • the pump comprises sealing means for sealing the second chamber against a return flow of medium.
  • the pump comprises connecting means for connecting the first plunger with the piston to simultaneously move the plunger and piston. Through this simultaneously movement both the pressure medium and the first medium are transported to the pump outlet.
  • the movement of the piston either by the pressure medium or the resilient means, means transport and uptake of the first medium to the pump outlet.
  • the pump outlet for the first medium and the pressure medium is the same. Therefore, a mixture of the pressure medium with the first medium is provided. E.g. in case of the pressure medium being water and the first medium being a soap concentrate, such a mixture would result in a fluid soap ready for use.
  • the pump further comprises a second plunger for uptake of a second medium from a third inlet to a third chamber.
  • the pump comprises second sealing means for sealing the third chamber against a return flow of medium.
  • the second pump preferably comprises second connecting means for connecting the second plunger to the piston (and preferably the first plunger) to simultaneously move the piston and second plunger (and preferably the first plunger) for transport of the pressure medium, and (first and) second medium to the pump outlet.
  • the pump outlet for the pressure medium, and the first and second medium are transported to the same pump outlet.
  • the outflow of the pump will be as a fluid soap ready for use.
  • the third inlet is at a different position as the second inlet to enable uptake of two different media, or the same medium at different altitudes in a tank with different densities.
  • the third inlet taking media from the same tank it is possible to have a mixture at the pump outlet of the pressure medium and two different densities of the other medium thereby creating a consistent mixture.
  • the pump comprises floating means for connecting the third inlet to the second chamber.
  • the floating means By the use of floating means it is possible to keep the third inlet at the upper level of e.g. a storage tank with decreasing level as the pumping operation continues. With the floating means keeping the third inlet at a different level as compared to the second inlet during the pumping operation density differences in a storage tank are compensated.
  • the floating means comprise pivoting means to enable keeping the third pump inlet above the second inlet.
  • the floating means comprise locking means for locking and unlocking the pivoting means. This enables the floating means to float on the top surface of the fluid in e.g. a storage tank. Therefore, the third inlet can be positioned just below this top level.
  • the floating means will pivot around the pivoting means to remain floating on the medium and thereby keeping the third inlet just below this top level.
  • the piston pump may start operation. In case the piston pump needs to be removed from the storage tank the floating means may be retracted to their original position by enabling the locking means. This may be relevant e.g. in case a storage tank is not fully empty.
  • the pump further comprises at least one shock absorber with a plunger.
  • the pump further comprises disposing means for disposing an amount of an agent medium in at least one chamber.
  • the disposing means will provide a certain amount of one or more agents into one of the chambers of the piston pump during a stroke of the piston and/or plungers.
  • agent may include a colouring agent supplying a specific colour to the inlet space of the pressure medium, thereby colouring the outflow from the piston pump.
  • a colouring agent supplying a specific colour to the inlet space of the pressure medium, thereby colouring the outflow from the piston pump.
  • the pump comprises connecting means for connecting the tank of agents medium to the pump. This enables the provision of a single piece of equipment for both the pump and the agent disposal means.
  • the agent medium to the pump it is possible to use the movement of the piston for disposal of the agent in the main pressure chamber related to this piston.
  • the pressure medium is a fluid.
  • a fluid, like water, used for the pressure medium would allow for movement of the piston in the cylinder.
  • the fluid is transported to the pump outlet and preferably mixed with one or two other media like e.g. soap concentrate.
  • soap concentrate may constitute of a mix of various chemicals with a rather large variation of molecular weight.
  • This concentrate may be taken from a storage tank.
  • After a relatively short period of time like e.g. 5 minutes it is possible to distinguish an upper part of e.g. 60% low density concentrate and a lower part of 40% higher density concentrate.
  • To achieve a consistent outflow of soap at the pump outlet such a mixture must reflect the differences in density of the soap concentrate.
  • the ratio of the first pressure chamber and second chamber is about 1:11, also ratios 1:10 and 1:12 are possible. However, it will be understood that also totally different ratios will be possible, like 1:1 and 1:100, depending on the density differences in the relevant media. This will include the ratios 1:23 and 1:35 that are also relevant for soap concentrates. Obviously, the volumes of the chambers related to the first and second plunger have to be chosen in correspondence with the characteristics of the soap concentrate. In the example mentioned here, this ratio would 2:3, although ratios between 1:2 and 2:1 would also be possible. However, it will be understood that ratios like 1:0,01 and 100:1 would also be possible.
  • the invention further relates to a method for pumping at least one medium using the reciprocating piston pump according to the invention. Using this method the advantages mentioned before will be obtained.
  • a reciprocating piston pump is located in a storage tank 4 that is put on a pallet 6 ( figure 1 ).
  • the piston pump 2 has an inlet 8 for supply of water as a pressure medium and an outlet 10 for the outgoing flow.
  • the pump 2 comprises a second inlet 12 and a third inlet 14 for uptake of a relatively low density fluid 16 and a relatively high density fluid 18.
  • the pump 2 is connected to tank 4 with connecting means 20.
  • the pump 2 is put at the bottom of the tank 4 with inlet 14.
  • the floating means 22 will be in approximately a horizontal position as it is rotated around pivot axis 24. To enable extraction of pump 2 from the tank 4 the floating means 22 are locked against the pump ( figure 2 ).
  • Pump 2 ( figures 5A and 5B ) comprises a housing 26 wherein a main piston 28 slides.
  • the piston 28 is connected to a central rod 30.
  • the pressure medium in this case water, enters the pump 2 at the inlet body 32.
  • the pressure chamber 34 will become smaller thereby increasing the pressure inside this chamber 34.
  • fluid in chamber 34 will be enabled to leave this room 34 and leave the pump 2 at the pump outlet 36 through the use of the valve member 38.
  • Valve member 38 ( figure 6 ) comprises an upper valve part 40 and a lower valve part 42.
  • the valve members 40 and 42 are received slidably in the piston 28.
  • the protruding ends of the valve bodies form actuating means which can co-act respectively with stops formed in the pressure room 34 by the fluid head disk 44 and the stop at the opposite end of the cylinder formed by the inlet body 32.
  • the pressure medium flows via the inlet body 32 towards the piston 28.
  • the pressure medium pushes the piston 28 downwards counter to the force of a spring.
  • the fluid in room 34 will flow through the opening between the lower valve part 42 and the piston channel through the pump outlet 36.
  • valve spring 46 As the actuating means or valve spring 46 meets its stop at the end of the downward movements, the valve member 38 will move relative to the piston 28 and the connection between outlet 36 and room 34 will be closed. At the same time the upper valve part 40 will be opened and both rooms opposite of the piston 28 will be connected. As the spring urges the piston 28 back to this begin position, as shown in figures 5 and 6 , the fluid will be transported from above the piston 28 to the room 34 below the piston 28. At the end of this return stroke when the piston 28 returns in his begin position the valve spring 46 will move the valve member 38 relative to the piston 28 so that the next cycles may start.
  • Piston 28 comprises three shock absorbers 48 ( figure 7 ).
  • the shock absorber 48 contains a shock absorber cap 50, a shock absorber barrel 52 and a shock absorber piston 54. This will compensate for undesired pressure variations and results in a more constant outflow. Fluid enters the space between absorber piston 54 and the bottom of barrel 52. The fluid urges the piston 54 upward, by allowing fluid to enter the absorber 48 through opening 55, thereby increasing the air pressure in the space above piston 54. Fluid is collected in the space below piston 54 during the movement of the main piston 28 from its upper to its lower position. In the return movement the air pressure above piston 54 pushes piston 54 downward thereby transporting the fluid to the outlet. Piston 54 is cup-shaped to increase the volume of the shock absorber 48.
  • the central rod or piston rod 30 is connected to a two staged plunger.
  • the large upper plunger is connected to the piston 28 with an area constituting a ratio between the pressure medium and the second (and further) medium of about 11:1.
  • the lower and smaller plunger section has a surface area of 60 % of the upper plunger leaving a ring shaped area of 40 %.
  • 60 % of the second and further medium is taken from the upper part of the storage tank volume, while the remaining 40 % are taken from the bottom of this storage tank.
  • the piston rod 30 is connected with the piston 28 and the plungers 56,58. A downward movement of piston 28 results in a simultaneous movement of the upper plunger 56 and lower plunger 58.
  • the circular area 60 between the lower plunger 58 and the fluid at fluid head 62 is emptied due to the downward movement of the upper plunger 20.
  • the chamber 64 is also emptied in this same downward movement of the piston 28.
  • the upper outlet valve 66 ( figure 8 ) is open during the downward movement of the piston 28 thereby allowing the medium in room 60 to be transported towards piston 28 and the pump outlet 36.
  • An upper support ring 68 lies against fluid head disk 22 and comprises upper support ring inner seal 70, an upper outlet outer seal 72 and also an upper support ring inner seal 74.
  • the outlet valve 66 is urged back from its second position to its first position due to the upper outlet spring 76.
  • the lower plunger 58 ( figure 9 ) in his downward movement moves the lower outlet valve 78 and allows transport of the medium in room 64 towards piston 28 and pump outlet 36.
  • the lower outlet spring 80 closes valve 78 when returning from its second position to its first position.
  • the center rod 30 comprises a lower seal 82.
  • the fluid head extension 84 is connected to a lower support ring 86.
  • the support ring 86 contains inner seals 88 and lower seals 90.
  • the fluid head extension 84 contains an upper seal 92 and lower seal 94.
  • the valve 78 contains an outer seal 96.
  • the chamber 64 is supplied with medium through suction pipe 98 in the piston movement from the second position back to its first position.
  • the medium is supplied through suction pipe 98 towards room 64 and an assembly 98 prevents a return flow of medium back into suction pipe 98 ( figure 9 ).
  • Assembly 100 comprises a lower inlet insert 102, a lower inlet body 104, a lower inlet gland 106 and a lower inlet poppet 108. Furthermore, the assembly 100 is provided with a lower inlet body outer seal 110, a lower inlet poppet seal 112 and two lower inlet body inlet seals 114.
  • the suction pipe 98 is connected to a pivotable inlet through coupling assembly 116 ( figure 10 ).
  • the assembly 116 pivots around a pivot axis construed by balance pivot bolt 118.
  • the assembly 116 further comprises two balance connectors 120, two balance pivot bearings 122 and the balance pivot 124.
  • the assembly 116 is sealed using four balance intake extension seals 126, two balance pivot seals 128 and two balance connector seals 130.
  • the assembly 116 is connected to its inlet through a balance open union 132 and a balance float bolt 134 leading to the inlet located in the balance float 136.
  • the inlet of floating part 136 ( figure 5A ) has a counter weight 138 that is connected by a horse shoe connection 140 with the counter weight extension 142. These parts are connected with four balance connectors closed unions 144.
  • Room 60 is supplied with medium through flexible suction pipe 146 that is connected to the corresponding inlet assembly 148 ( figure 11 ).
  • the assembly 148 comprises a bottom
  • the center rod 30 comprises a lower seal 82.
  • the fluid head extension 84 is connected to a lower support ring 86.
  • the support ring 86 contains inner seals 88 and lower seals 90.
  • the fluid head extension 84 contains an upper seal 92 and lower seal 94.
  • the valve 78 contains an outer seal 96.
  • the chamber 64 is supplied with medium through suction pipe 98 in the piston movement from the second position back to its first position.
  • the medium is supplied through suction pipe 98 towards room 64 and an assembly 98 prevents a return flow of medium back into suction pipe 98 ( figure 9 ).
  • Assembly 100 comprises a lower inlet insert 102, a lower inlet body 104, a lower inlet gland 106 and a lower inlet poppet 108. Furthermore, the assembly 100 is provided with a lower inlet body outer seal 110, a lower inlet poppet seal 112 and two lower inlet body inlet seals 114.
  • the suction pipe 98 is connected to a pivotable inlet through coupling assembly 116 ( figure 10 ).
  • the assembly 116 pivots around a pivot axis construed by balance pivot bolt 118.
  • the assembly 116 further comprises two balance connectors 120, two balance pivot bearings 122 and the balance pivot 124.
  • the assembly 116 is sealed using four balance intake extension seals 126, two balance pivot seals 128 and two balance connector seals 130.
  • the assembly 116 is connected to its inlet through a balance open union 132 and a balance float bolt 134 leading to the inlet located in the balance float 136.
  • the inlet of floating part 136 ( figure 5A ) has a counter weight 138 that is connected by a horse shoe connection 140 with the counter weight extension 142. These parts are connected with four balance connectors closed unions 144.
  • Room 60 is supplied with medium through flexible suction pipe 146 that is connected to the corresponding inlet assembly 148 ( figure 11 ).
  • the assembly 148 comprises a bottom disk 150 and a bottom disk insert 152.
  • the assembly 148 further comprises a bottom disk retaining ring 154.
  • the suction pipe 146 supplies the medium at the other side through an upper inlet assembly 156 ( figure 12 ). Each of the two suction pipes 146 inputs the medium through a separate upper inlet assembly 156.
  • Each assembly 156 comprises an upper inlet poppet 158, a lower supporting ring outer seal 160 and an upper inlet spring 162.
  • a floating assembly To enable intake of medium from the top level of a liquid in a storage tank a floating assembly is allowed to pivot around its axis, as described before. To enable removal of the pump 2 from the storage tank it is required that the floating device returns to its original position.
  • a locking assembly comprising a lock spring 164, a mounting gland 166, a lock sleeve 168, a lock body 170, a large balance protector 172 and a small balance protector 174 (see also figure 4 ).
  • the assembly further comprises a lock body support 176.
  • the balance protector 174 is connected to the pivoting assembly 156 through a rod 178, washer 180 and nut 182 with bolt 184.
  • the large protector 172 is connected through the threaded rod 186, washer 188 and nut 190.
  • the protectors 172, 174 are connected to the pump 2 ( figure 5B ) and do not pivot with the floating assembly.
  • the lock body 170 comprises a cam 171 that engages the floating means 22. By movement of the lock body 170 and cam 171, the floating means 22 are locked or unlocked for its pivotal movement. When unlocked the floating means start to pivot, depending on the level of fluid in the tank 4, and engages the lock body 170 when reaching a horizontal level.
  • spring means 204 are on one end engaging spring support 206 with spring bushing 208. On its other end spring 204 lies against spring support 210 that is connected to inlet body 32.
  • the rod 200 consists of a bottom part 212 and an upper part 214 that are connected through a union 216 comprising a seal 218.
  • Inlet body 32 is sealed with an inlet body seal 220.
  • the spring support 210 is sealed with seals 222, 224 and backup seal 226.
  • agent medium is supplied from agent supply room 192 ( figure 13 ).
  • the agent medium is supplied using a separate plunger 228.
  • the diameter extension 230 at the end of the rod, changing from 44 to 46 mm, drives the plunger 228. Thereby the movements of this plunger 228 are connected with piston 28.
  • the displacement of the plunger 228 would be 1 mm with a diameter of 10 mm resulting in a volumetric displacement of about 79 ⁇ l.
  • the inlet and outlet valves for the plunger comprise steel balls 232, 234 in a bore of about 3,2 mm with a stroke of about 0,4 mm. The balls seal in one direction.
  • a rubber spring 236 pushes the large ball 238 and the plunger 228 against the rod.
  • the rod extension compresses the spring 236.
  • the spring 236 increases its diameter filling the space inside the plunger and insert 240 preventing a substantial dead volume. This configuration will, in relevant cases, ensure a more constant supply of agent medium and enable a smooth start-up of the agent supply.
  • agent medium is supplied from an agent supply room 192.
  • This room 192 comprises an agent filler cap 194 for refilling and a top lid.
  • the room 192 is sealed with a filler cap seal 198, through which the top rod 200 may be moved.
  • This rod is supplied with a top cap.
  • an agent pusher that at the end of the stroke, enters into a cone of spring support 210 thereby pushing the desired droplets of agents medium by the seal into the room above the piston 28 during the movement from first to second position.
  • the pressure medium may be water and the first and second medium may be a soap concentrate.
  • other media will also be possible.
  • it will be possible to supply all inlets with different media from different storage tanks.
  • the configuration of the pump may be changed, for example in that room 60 is connected to the inlet of the floating assembly instead of the bottom inlet.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
EP07075373A 2007-05-15 2007-05-15 Pompe à piston alternative fonctionnant sur un support de pression Withdrawn EP1992818A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07075373A EP1992818A1 (fr) 2007-05-15 2007-05-15 Pompe à piston alternative fonctionnant sur un support de pression
US11/901,123 US20080286120A1 (en) 2007-05-15 2007-09-14 Reciprocating piston pump operating on pressure medium
NO20083599A NO20083599L (no) 2007-05-15 2008-08-20 Stempelpumpe driftende på trykkmedium

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07075373A EP1992818A1 (fr) 2007-05-15 2007-05-15 Pompe à piston alternative fonctionnant sur un support de pression

Publications (1)

Publication Number Publication Date
EP1992818A1 true EP1992818A1 (fr) 2008-11-19

Family

ID=38983325

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07075373A Withdrawn EP1992818A1 (fr) 2007-05-15 2007-05-15 Pompe à piston alternative fonctionnant sur un support de pression

Country Status (3)

Country Link
US (1) US20080286120A1 (fr)
EP (1) EP1992818A1 (fr)
NO (1) NO20083599L (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2622997A1 (fr) * 2012-02-03 2013-08-07 Minima Espresso Systems, S.L. Système de fourniture d'un liquide sous pression, procédé de fourniture d'un liquide sous pression au moyen de ce système et machine de préparation de boissons comprenant ledit système
WO2016109658A1 (fr) 2014-12-30 2016-07-07 Graco Minnesota Inc. Tige de pompe et liaison d'entraînement avec configuration de réduction de charge latérale
BR102018003284B1 (pt) 2017-02-21 2021-07-20 Graco Minnesota Inc. Haste de pistão para uma bomba, bomba, pulverizador, e, método para substituir uma luva de desgaste
CN115362318A (zh) 2020-03-31 2022-11-18 固瑞克明尼苏达有限公司 泵驱动系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB973280A (en) * 1961-04-17 1964-10-21 Humber Ltd Improvements relating to piston pumps
US3208396A (en) * 1962-09-06 1965-09-28 Budzich Tadeusz Fluid pressure control system
DE1403747A1 (de) * 1960-08-30 1969-03-06 Bendix Corp Pumpe mit veraenderlicher Foerdermenge und konstantem Druck
DE1528629B1 (de) * 1959-07-06 1970-01-02 Weatherhead Co Schubtrieb zum Längsverschieben des Zylinderblocks einer Taumelscheiben-Axialkolbenpumpe
US3588285A (en) * 1968-10-21 1971-06-28 Sunstrand Corp Hydraulic pump

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Publication number Priority date Publication date Assignee Title
US3357363A (en) * 1966-11-15 1967-12-12 Internat Basic Eeonomy Corp Hydraulic machine
DE2020317A1 (de) * 1970-04-25 1971-11-11 Krueger Gmbh H Pumpvorrichtung
US3768932A (en) * 1971-06-09 1973-10-30 Sigma Np Automatic double acting differential pump
US4441862A (en) * 1981-12-07 1984-04-10 Haskel, Inc. Synchronized mixing pump
US4509409A (en) * 1983-02-07 1985-04-09 Towmotor Corporation Pump arrangement for a linear fluid operated device
US5529460A (en) * 1993-07-28 1996-06-25 Coleman Powermate, Inc. Pressure washer with flow control switch
US6386841B1 (en) * 1998-12-28 2002-05-14 Schmidt, Kranz & Co. Gmbh Pneumatically operated hydraulic pump
US6478552B1 (en) * 2000-05-09 2002-11-12 Thermaco, Inc. Fluid motivated pump

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1528629B1 (de) * 1959-07-06 1970-01-02 Weatherhead Co Schubtrieb zum Längsverschieben des Zylinderblocks einer Taumelscheiben-Axialkolbenpumpe
DE1403747A1 (de) * 1960-08-30 1969-03-06 Bendix Corp Pumpe mit veraenderlicher Foerdermenge und konstantem Druck
GB973280A (en) * 1961-04-17 1964-10-21 Humber Ltd Improvements relating to piston pumps
US3208396A (en) * 1962-09-06 1965-09-28 Budzich Tadeusz Fluid pressure control system
US3588285A (en) * 1968-10-21 1971-06-28 Sunstrand Corp Hydraulic pump

Also Published As

Publication number Publication date
US20080286120A1 (en) 2008-11-20
NO20083599L (no) 2009-03-16

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