US20080260550A1 - Deep Well Irrigation Pump - Google Patents

Deep Well Irrigation Pump Download PDF

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Publication number
US20080260550A1
US20080260550A1 US10/579,513 US57951304A US2008260550A1 US 20080260550 A1 US20080260550 A1 US 20080260550A1 US 57951304 A US57951304 A US 57951304A US 2008260550 A1 US2008260550 A1 US 2008260550A1
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US
United States
Prior art keywords
closed
closed conduit
movable piston
conduit
pump
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.)
Abandoned
Application number
US10/579,513
Inventor
Martin J. Fisher
Lawrence E. Carlson
Ben Tarbell
Jonathan I. Kaplan
Shilajeet Banerjee
Opher Doron Yom-Tov
Ari T. Adler
Christine M. Kurjan
Robert Ian Lister
Alan Charles Spybey
Abdilkadir Mohammed Musa
Mohammed Swaleh
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.)
Kickstart International
Kickstart International Inc
Original Assignee
Kickstart International
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
Priority to US51988703P priority Critical
Application filed by Kickstart International filed Critical Kickstart International
Priority to US10/579,513 priority patent/US20080260550A1/en
Priority to PCT/US2004/038130 priority patent/WO2005050022A1/en
Assigned to KICKSTART INTERNATIONAL, INC. reassignment KICKSTART INTERNATIONAL, INC. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SPYBEY, ALAN CHARLES, ADLER, ARI T., FISHER, MARTIN J., TARBELL, BEN, BANERJEE, SHILAJEET, KURJAN, CHRISTINE M., KAPLAN, JONATHAN I., LISTER, ROBERT IAN, YOM-TOV, OPHER DORON, CARLSON, LAWRENCE E.
Assigned to KICKSTART INTERNATIONAL reassignment KICKSTART INTERNATIONAL ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MUSA, ABDILKADIR MOHAMMED
Publication of US20080260550A1 publication Critical patent/US20080260550A1/en
Abandoned legal-status Critical Current

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Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B53/00Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/10Valves; Arrangement of valves
    • F04B53/12Valves; Arrangement of valves arranged in or on pistons
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04BPOSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B47/00Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps
    • F04B47/02Pumps or pumping installations specially adapted for raising fluids from great depths, e.g. well pumps the driving mechanisms being situated at ground level
    • F04B47/026Pull rods, full rod component parts

Abstract

Provided herein are exemplary embodiments of an efficient pump apparatus. In one embodiment the pump apparatus comprises a piston assembly loosely disposed within a cylinder. The piston assembly includes a driving cable connecting a top leaky piston and a bottom leaky piston having a check valve connected thereto. The cylinder includes an outlet pipe at an upper portion thereof and a check valve located at a lower end of the cylinder. The pistons move in the cylinder at a velocity relative to the conduit such that as the pistons move along the cylinder they create a substantial tortuous leak path forming a hydrodynamic seal between the pistons and the cylinder.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This application claims the benefit of priority to U.S. Application No. 60/519,887, filed Nov. 14, 2003, the entire disclosure of which is hereby incorporated by reference as if set forth at length herein.
  • STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
  • Not applicable
  • REFERENCE OF A “MICROFICHE APPENDIX”
  • Not applicable
  • FIELD OF THE INVENTION
  • The present invention relates generally to pumping devices.
  • BRIEF DESCRIPTION OF THE DRAWINGS
  • Exemplary embodiments of the present invention are now briefly described with reference to the following drawings:
  • FIG. 1 depicts one aspect of the present invention in accordance with the teachings presented herein.
  • FIG. 2 depicts a second aspect of the present invention in accordance with the teachings presented herein.
  • FIG. 3 depicts a third aspect of the present invention in accordance with the teachings presented herein.
  • FIG. 4 depicts a fourth aspect of the present invention in accordance with the teachings presented herein.
  • FIG. 5 depicts a fourth aspect of the present invention in accordance with the teachings presented herein,
  • FIG. 6 depicts a fourth aspect of the present invention in accordance with the teachings presented herein
  • DESCRIPTION OF THE INVENTION
  • The aspects, features and advantages of the present invention will become better understood with regard to the following description with reference to the accompanying drawings. What follows are preferred embodiments of the present invention. It should be apparent to those skilled in the art that the foregoing is illustrative only and not limiting, having been presented by way of example only. All the features disclosed in this description may be replaced by alternative features serving the same purpose, and equivalents or similar purpose, unless expressly stated otherwise. Therefore, numerous other embodiments of the modifications thereof are contemplated as falling within the scope of the present invention as defined herein and equivalents thereto.
  • FIG. 1 depicts an exemplary embodiment of an efficient pump apparatus 100 constructed in accordance with the present invention. As shown, the pump apparatus includes at a piston assembly loosely disposed within a cylinder. The piston assembly includes a driving cable connecting a top leaky piston and a bottom leaky piston having a check valve connected thereto. The cylinder includes an outlet pipe on a upper portion thereof and a check valve located at a lower end of the cylinder. Key features of the pump apparatus 100 will now be described below.
  • Long Loose Leaky Piston
  • In an exemplary embodiment, the present invention employs two “long loose leaky pistons”, having a length greater than that of conventional washers used in prior art rope and washer pumps. The “long loose leaky pistons”, when reciprocated up and down in the cylinder, displace a volume of fluid and create a pressure head. The loose fit between the piston and the cylinder accommodates extremely loose dimensional tolerances (like those found in the inconsistent pipes that are available in many developing countries) and also has many other advantages listed below. Instead of having a tight fitting seal between the piston and cylinder they are both made of cylindrical pipes with the outer diameter of the piston being slightly smaller (up to a few % of the diameter) than the inner diameter of the cylinder. As the piston moves, the length of the piston creates a tortuous leak path making a hydrodynamic seal and allowing the piston to pressurize the fluid. The longer the piston, and the smaller the gap the more efficient this seal becomes.
  • The advantages of a “long-loose leaky piston” over other prior art pistons, include:
      • (1) There is very little friction between the piston and cylinder and this friction does not vary much with depth of pumping. The gap between the piston and cylinder is filled with fluid mailing them hydrodynamically lubricated. In a normal piston and cylinder pump there is a piston cup (often leather or rubber) where the sealing force and thus the frictional force increases linearly with the depth of the pumping and greatly increases the pumping forces required. This new pump can thus be very energy efficient compared to a normal piston and cylinder pump.
      • (2) The hydrodynamic lubrication means that for clean fluids there is almost no problem with wear on either the piston or cylinder unlike for traditional piston pumps where wear is a major issue and requires the cylinder to be made of hardened material and the piston ring/cup to be replaced on a regular basis. (friction and wear are of-course closely related in this instance).
      • (3) Because there is no physical contact between the piston and cylinder the force required to lower the piston is also greatly reduced—it is now only the hydrodynamic drag thru the valve and this allows us to rely on gravity to lower the piston. In regular piston cylinder pumps piston rods are required to push the piston down (to overcome the frictional forces between the piston cup and the cylinder) on the return stroke.
      • (4) Because the leaky piston has a substantial leak path the pumping efficiency of the pump is highly velocity dependent (unlike for a traditional piston and cylinder pump). The faster the piston moves the more efficient the pump becomes. (And it also turns out that the longer the stroke the more efficient the pump becomes since less time is taken with the valves open between strokes and the water has to be re-accelerated fewer times—but this last point is also true on traditional piston pumps).
      • (5) Pumping efficiency is also dependent on the cylinder-piston gap and on the length of the piston (length of the leak path). A longer piston and tighter gap decreases the leakage and increases the volumetric efficiency but also increases the hydrodynamic drag so eventually in the limit it also decreases the energy efficiency. In a normal piston and cylinder pump the volumetric efficiency is pretty much constant (because the tight seal between piston and cylinder) while the energy efficiency decreases with depth of pumping because of greatly increased frictional losses.
      • (6) A leaky piston is also much less dependent on precise dimensional tolerances between the piston and cylinder compared to a traditional piston pump, and also the surface quality of the cylinder (which usually has to be a very smooth machined surface) is no longer such a major issue. This means that a pump with a leaky piston can be made from fairly rough materials. However, dimensional straightness over the length of the piston and cylinder is still critical. This low need for exact tolerances means that it is possible for the pumping pipe to also act as the cylinder/cylinders, which is another big advantage of the design.
    Flexible Cable Drive
  • In an exemplary embodiment, the present invention further employs a flexible cable drive (such as a chain, rope, wire, or some other flexible member). Most reciprocating deep well pumps use a rigid driving rod that can push the piston down (and pull it up). This design requires more material and bearing infrastructure to prevent the rod from buckling. The present invention uses gravity to return the bottom piston to its bottom position offering a cheaper, easier to assemble/transport, and reliable solution. There is no contact between the piston and the cylinder therefore no real drag occurs between the piston and the cylinder.
  • Top Piston and Bottom Piston
  • To enable a pressure head above ground, the present invention (which is very important for many applications including irrigation) includes a top leaky piston without any additional valves (other than the two check valves in the bottom cylinder and piston). On the pressure stroke (forcing the top piston down), water is pressurized against the existing bottom check valve and out the outlet at the top of the well. This embodiment reduces the number of valves and seals.
  • It turns out, however, that the addition of another one-way outlet valve in the outlet pipe increases the efficiency of the pump. Without this extra valve the bottom loose piston gap sees the full (below ground and above ground) pressure head on the up stroke and it leaks a lot more and reduces efficiency. Another embodiment of the present invention employs an outside sleeve over the top cylinder with an outlet pipe only at the top end of it, instead of an outlet pipe at the bottom of the top cylinder. The addition of the outside sleeve feature keeps the overall diameter of the down hole components to a minimum allowing the pump to be used in a small diameter bore hole.
  • ADDITIONAL EMBODIMENTS OF THE PRESENT INVENTION
  • In accordance with an alternative embodiment of the present invention, a pump could be constructed with only the bottom leaky piston and a flexible tension member (rope, cable chain, etc) pulling it up and letting it drop by gravity. A pump can be built without the top leaky piston and without the outlet pipe.
  • In accordance with a second alternative embodiment of the present invention, any type of drive mechanism could be connected to the pump mechanism, including but not limited to other manual drives, a gasoline engine or electric motor.
  • In accordance with a third alternative embodiment of the present invention, a flexible piston option would work in the case where there is a non-straight cylinder. Here the hydrodynamic pressure would act to ensure that the piston flexes so that it won't get jammed in the cylinder. This would be very useful for pumping fluids through curved pipes.
  • In accordance with a fourth alternative embodiment of the present invention, a double reciprocating piston pump (with two pistons one above the other operating 180 degrees out of synch) may be used, with two cables going down the pumping tube.
  • In accordance with a fifth alternative embodiment of the present invention, any type of valve could be used.
  • FIGS. 2A-D depict details of the bottom leaky piston and FIGS. 3A-B depict details of the top leaky piston.
  • FIGS. 4A-D depict aspects of alternative exemplary embodiments of pump apparatus 100.
  • FIGS. 5A-D depict of alternative exemplary embodiments of pump apparatus 100.
  • FIG. 6 depicts an assembly incorporating an exemplary embodiment of pump apparatus 100.
  • The present invention pump apparatus 100 is operated by repeatedly driving the top piston up and down while the bottom cylinder and check valve are submersed in a fluid. The fluid is pulled into the bottom check valve on the up stroke and is forced out of the outlet pipe under pressure during the down stroke. The two pistons are connected by a flexible tension member (rope, cable chain) that pulls up the bottom piston on the up stroke and then gravity returns the bottom piston to place on the down stroke. The pump 100 may be driven by two foot operated treadles like a small stair master machine.
  • The pump 100 adds a variable mechanical advantage on the drive mechanism giving a high mechanical advantage at the start of each stroke (allowing for increased acceleration) and a low mechanical advantage at the end of each stroke (allowing for increased velocity) thereby maximizing the average piston velocity over the stroke and increasing the overall energy efficiency of the pump. This is an attractive feature for a human powered pump.
  • Having now described preferred embodiments of the invention, it should be apparent to those skilled in the art that the foregoing is illustrative only and not limiting, having been presented by way of example only. All the features disclosed in this specification (including any accompanying claims, abstract, and drawings) may be replaced by alternative features serving the same purpose, and equivalents or similar purpose, unless expressly stated otherwise. Therefore, numerous other embodiments of the modifications thereof are contemplated as falling within the scope of the present invention as defined by the appended claims and equivalents thereto.

Claims (10)

1. An energy efficient pump apparatus, comprising:
a first closed conduit having a first and a second end;
a first movable piston having a closed end having an effective length A greater than a median radius of the first closed conduit, the first movable piston being loosely disposed within the first closed conduit such that a first gap having a predefined median size is formed between the first movable piston and the first closed conduit, and
a flexible drive member connected to a top end of the first movable piston and operable to move the first movable piston up and down along the first closed conduit,
(i) wherein the first movable piston is movable in the first closed conduit at a velocity relative to the first closed conduit such that as the first movable piston moves along the first closed conduit, the first movable piston creates a substantially tortuous leak path forming a hydrodynamic seal between the first movable piston and the first closed conduit, thereby enabling the first movable piston to displace fluid along the first closed conduit, and
(ii) an efficiency of the hydrodynamic seal is based on the predefined median size of the first gap, the effective length A of the first movable piston, and the velocity of the first movable piston.
2. The pump apparatus of claim 1 wherein the first movable piston further comprises a one-way valve disposed therein, and the first movable piston and the first closed conduit are arranged such that when the first movable piston is moved back and forth along the first closed conduit, the first movable piston pulls and pumps fluid along the first closed conduit.
3. The pump apparatus of claim 2 wherein the first closed conduit is positioned at an angle other than horizontal, the first closed conduit further comprises a one-way inlet valve at a lower portion thereof, and the first movable piston and the first closed conduit are arranged such that when the first movable piston is moved up and down along the first closed conduit, fluid is pulled into and pumped up the first closed conduit.
4-5. (canceled)
6. The pump apparatus of claim 1 further comprising a pipe having a top end and a bottom end, wherein (i) the bottom end of the pipe is attached to the top end of the first closed conduit, (ii) during an up-stroke of the pump apparatus, the first movable piston is pulled up by the flexible drive member, and (iii) during a down-stroke of the pump apparatus, the first movable piston is pulled down by gravity, thereby pulling and pumping fluid into and up the pipe.
7. The pump apparatus of claim 6 further comprising:
a second closed conduit having a top end and a bottom end, and including an outlet disposed at a lower end of the second closed conduit; and
a second movable piston loosely disposed within the second closed conduit such that a second gap having a predefined median size is formed between the second movable piston and the second closed conduit, the second movable piston including a rigid drive member.
wherein the bottom end of the second closed conduit is attached to the top end of the pipe, and
during operation of the pump apparatus the first and second movable pistons move in the respective first and second closed conduits to facilitate fluid flow into the first closed conduit, such that the fluid flows into and up the pipe on the up-stroke, and out of the outlet under pressure on the down-stroke.
8. The pump apparatus of claim 7 further comprising an outlet pipe connected to the outlet at the lower end of the second closed conduit and a one-way outlet valve disposed in the outlet pipe to limit the amount of force required to move the first and second movable pistons on the up-stroke.
9. The pump apparatus of claim 7 further comprising:
a closed sleeve outlet conduit comprising a closed sleeve and an outlet pipe connected to an upper portion of the closed sleeve, the closed sleeve outlet conduit covering the second closed conduit and creating a second gap between an outer wall of the second closed conduit and an inner wall of the closed sleeve, such that the second gap is sealed both at a bottom and a top of the closed sleeve outlet conduit, and such that substantially any fluid flowing through the outlet at the lower end of the second closed conduit flows into the second gap,
wherein during operation of the pump apparatus the first and second movable pistons move in the respective first and second closed conduits to facilitate fluid flow into (i) the first closed conduit, into and up the pipe and into the second closed conduit during the up-stroke, and (ii) through the opening of the second closed conduit, into the sleeve-conduit gap and out of the outlet pipe under pressure during the down-stroke.
10. The pump apparatus of claim 9 wherein the sleeve outlet pipe includes a one-way valve disposed therein to limit the amount of force required to move the first and second movable pistons on the up-stroke.
11-31. (canceled)
US10/579,513 2003-11-14 2004-11-15 Deep Well Irrigation Pump Abandoned US20080260550A1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US51988703P true 2003-11-14 2003-11-14
US10/579,513 US20080260550A1 (en) 2003-11-14 2004-11-15 Deep Well Irrigation Pump
PCT/US2004/038130 WO2005050022A1 (en) 2003-11-14 2004-11-15 Deep well irrigation pump

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US10/579,513 US20080260550A1 (en) 2003-11-14 2004-11-15 Deep Well Irrigation Pump

Publications (1)

Publication Number Publication Date
US20080260550A1 true US20080260550A1 (en) 2008-10-23

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ID=34619391

Family Applications (1)

Application Number Title Priority Date Filing Date
US10/579,513 Abandoned US20080260550A1 (en) 2003-11-14 2004-11-15 Deep Well Irrigation Pump

Country Status (5)

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US (1) US20080260550A1 (en)
CN (1) CN100465443C (en)
AP (1) AP2095A (en)
BR (1) BRPI0416598A (en)
WO (1) WO2005050022A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011100430A2 (en) * 2010-02-10 2011-08-18 Kickstart International, Inc. Human-powered irrigation pump

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US149953A (en) * 1874-04-21 Improvement in pumps
US205699A (en) * 1878-07-02 Improvement in lifting and force pumps
US372888A (en) * 1887-11-08 Eoscoe bean
US523240A (en) * 1894-07-17 Double-acting pump
US724569A (en) * 1902-05-17 1903-04-07 Elmer W Gragert Relay-pump.
US767092A (en) * 1904-03-08 1904-08-09 Edwin R Walker Pump.
US909676A (en) * 1907-10-26 1909-01-12 George Adam Rockola Pump.
US1012917A (en) * 1910-09-07 1911-12-26 George Adam Rockola Pump.
US1520621A (en) * 1924-05-29 1924-12-23 Herbert H Watkins Rectilinear pump
US1539556A (en) * 1922-07-13 1925-05-26 Deming Co Pump
US1600352A (en) * 1925-09-10 1926-09-21 Nagy David Seesaw
US1721245A (en) * 1927-09-06 1929-07-16 Lester C Black Flexible multistage deep-well pump plunger
US1831379A (en) * 1929-05-30 1931-11-10 Creser Alfred Augustus Thomas Inflating apparatus
US1974964A (en) * 1933-06-05 1934-09-25 Perey D Lyons Multiple pump for embalming and other purposes
US2061252A (en) * 1936-02-17 1936-11-17 Clifford M Peters Plunger pump
US2074787A (en) * 1933-07-03 1937-03-23 Herbst Paul Piston pump for gases and liquids
US2633808A (en) * 1948-09-25 1953-04-07 Jack C Webber Well swab
US2651454A (en) * 1948-06-21 1953-09-08 Bjurstrom Thure Hjalmar Foot pump
US3551012A (en) * 1968-12-23 1970-12-29 Wayne N Sutliff Rod shock absorber
US3730651A (en) * 1972-01-12 1973-05-01 L Ellis Pump and folding support arrangement therefor
US4173431A (en) * 1977-07-11 1979-11-06 Nu-Watt, Inc. Road vehicle-actuated air compressor and system therefor
US4688999A (en) * 1984-09-24 1987-08-25 Battelle Devepment Corporation Well pump
US5000441A (en) * 1990-04-25 1991-03-19 Wang Shui Mu Simulated climbing exercise device
US5118265A (en) * 1990-11-02 1992-06-02 Bearss James G Liquid pump assembly
US5299994A (en) * 1993-05-03 1994-04-05 Ping Chen Retarding device for an exerciser
US5346452A (en) * 1993-04-01 1994-09-13 Ku Tse Fen Adjustable air resistance system for fitness equipment
US6341782B1 (en) * 2000-03-03 2002-01-29 Surface Technologies Ltd Lubricated seals having micropores
US6622612B2 (en) * 2001-05-25 2003-09-23 Hammelmann Maschinenfabrik Gmbh Pump, particularly plunger pump

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CN2531127Y (en) * 2001-04-12 2003-01-15 罗小朋 Constant power multi-functional foot water pump

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US149953A (en) * 1874-04-21 Improvement in pumps
US205699A (en) * 1878-07-02 Improvement in lifting and force pumps
US372888A (en) * 1887-11-08 Eoscoe bean
US523240A (en) * 1894-07-17 Double-acting pump
US724569A (en) * 1902-05-17 1903-04-07 Elmer W Gragert Relay-pump.
US767092A (en) * 1904-03-08 1904-08-09 Edwin R Walker Pump.
US909676A (en) * 1907-10-26 1909-01-12 George Adam Rockola Pump.
US1012917A (en) * 1910-09-07 1911-12-26 George Adam Rockola Pump.
US1539556A (en) * 1922-07-13 1925-05-26 Deming Co Pump
US1520621A (en) * 1924-05-29 1924-12-23 Herbert H Watkins Rectilinear pump
US1600352A (en) * 1925-09-10 1926-09-21 Nagy David Seesaw
US1721245A (en) * 1927-09-06 1929-07-16 Lester C Black Flexible multistage deep-well pump plunger
US1831379A (en) * 1929-05-30 1931-11-10 Creser Alfred Augustus Thomas Inflating apparatus
US1974964A (en) * 1933-06-05 1934-09-25 Perey D Lyons Multiple pump for embalming and other purposes
US2074787A (en) * 1933-07-03 1937-03-23 Herbst Paul Piston pump for gases and liquids
US2061252A (en) * 1936-02-17 1936-11-17 Clifford M Peters Plunger pump
US2651454A (en) * 1948-06-21 1953-09-08 Bjurstrom Thure Hjalmar Foot pump
US2633808A (en) * 1948-09-25 1953-04-07 Jack C Webber Well swab
US3551012A (en) * 1968-12-23 1970-12-29 Wayne N Sutliff Rod shock absorber
US3730651A (en) * 1972-01-12 1973-05-01 L Ellis Pump and folding support arrangement therefor
US4173431A (en) * 1977-07-11 1979-11-06 Nu-Watt, Inc. Road vehicle-actuated air compressor and system therefor
US4688999A (en) * 1984-09-24 1987-08-25 Battelle Devepment Corporation Well pump
US5000441A (en) * 1990-04-25 1991-03-19 Wang Shui Mu Simulated climbing exercise device
US5118265A (en) * 1990-11-02 1992-06-02 Bearss James G Liquid pump assembly
US5346452A (en) * 1993-04-01 1994-09-13 Ku Tse Fen Adjustable air resistance system for fitness equipment
US5299994A (en) * 1993-05-03 1994-04-05 Ping Chen Retarding device for an exerciser
US6341782B1 (en) * 2000-03-03 2002-01-29 Surface Technologies Ltd Lubricated seals having micropores
US6622612B2 (en) * 2001-05-25 2003-09-23 Hammelmann Maschinenfabrik Gmbh Pump, particularly plunger pump

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011100430A2 (en) * 2010-02-10 2011-08-18 Kickstart International, Inc. Human-powered irrigation pump
WO2011100430A3 (en) * 2010-02-10 2012-01-05 Kickstart International, Inc. Human-powered irrigation pump
US8770954B2 (en) 2010-02-10 2014-07-08 KickSmart International, Inc. Human-powered irrigation pump
AP3556A (en) * 2010-02-10 2016-01-18 Kickstart International Inc Human-powered irrigation pump

Also Published As

Publication number Publication date
WO2005050022A1 (en) 2005-06-02
CN1950605A (en) 2007-04-18
BRPI0416598A (en) 2007-01-30
CN100465443C (en) 2009-03-04
AP200603634A0 (en) 2006-06-30
AP2095A (en) 2010-01-29

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Owner name: KICKSTART INTERNATIONAL, INC., CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ADLER, ARI T.;BANERJEE, SHILAJEET;CARLSON, LAWRENCE E.;AND OTHERS;REEL/FRAME:018334/0017;SIGNING DATES FROM 20060717 TO 20060801

AS Assignment

Owner name: KICKSTART INTERNATIONAL, CALIFORNIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MUSA, ABDILKADIR MOHAMMED;REEL/FRAME:020805/0457

Effective date: 20080320

STCB Information on status: application discontinuation

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