US3565298A - Liquid-dispensing device - Google Patents

Liquid-dispensing device Download PDF

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Publication number
US3565298A
US3565298A US789892A US3565298DA US3565298A US 3565298 A US3565298 A US 3565298A US 789892 A US789892 A US 789892A US 3565298D A US3565298D A US 3565298DA US 3565298 A US3565298 A US 3565298A
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US
United States
Prior art keywords
piston
valve
delivery
intake
slide
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.)
Expired - Lifetime
Application number
US789892A
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English (en)
Inventor
Lars Erik Ohlin
Gosta Carlsson
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Individual
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Individual
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Publication date
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Publication of US3565298A publication Critical patent/US3565298A/en
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Expired - Lifetime 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
    • F04B7/00—Piston machines or pumps characterised by having positively-driven valving
    • F04B7/0042—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member
    • F04B7/0053—Piston machines or pumps characterised by having positively-driven valving with specific kinematics of the distribution member for reciprocating distribution members
    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/14—Pistons, piston-rods or piston-rod connections
    • 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
    • F04B9/02—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical
    • F04B9/04—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms
    • F04B9/042—Piston machines or pumps characterised by the driving or driven means to or from their working members the means being mechanical the means being cams, eccentrics or pin-and-slot mechanisms the means being cams

Definitions

  • the piston drive mechanism includes a variable first lost-motion connection providing for an abrupt discontinuance of the pump strokes and a second lost-motion connection providing for a rest period of the pump piston at the end of the delivery stroke to permit the intake and delivery valves to be opened and closed with no flow taking place in the intake and delivery passages.
  • This invention relates to a device for repeatedly dispensing a predetermined quantity of liquid and, more particularly, a liquid-dispensing device having a reciprocating piston pump including intake and delivery valves actuated by the drive means of the pump piston to open and close intake and delivery passages at the ends of the pump strokes.
  • a prior art device of this character is described in British Pat. Specification No. 1,030,368.
  • the principal object of the invention is-to provide a liquid dispensing device of the character described in which provision is made to substantially eliminate fouling caused by leakage of the liquid from the valves or drops falling from the delivery conduit after the delivery stroke of the pump piston has been discontinued.
  • FIG. 1 is a side elevational view, partly in section, of a preferred embodiment of the dispensing device with the intake valve in open position and the delivery valve in closed position;
  • FIG. 2 is a side elevational view corresponding to the upper portion of FIG. I with the valve positions reversed;
  • the lower end 25 of the push rod 22 is adapted to screw as a cam follower and is maintained in sliding engagement with a cam disc 26 by the spring 23.
  • the cam surface of the cam disc 26, which is rotated through 360 for each dispensing cycle by a motor 27, comprises two substantially semicircular segments 28 and 29 having different radii (see FIG. 3).
  • the lower end of the piston 2 engages the upper end of the collar 4 so that the piston 2 and the piston rod 3 are arrested and the intake of liquid is discontinued.
  • the slide plate 32 then continues its downward travel until it reaches the bottom dead center, the overtravel being accommodated by the driver spring 37.
  • the overtravel ensures that the piston 2 is always arrested in an accurately defined bottom end position irrespective of any backlash in the connection between the cam disc 26 and the slide plate 32 and the piston rod 3.
  • valve-actuating lever 19 is pivoted in the anticlockwise direction (as seen in FIGS. 1 and 2) about the pivot 21 under the influence of the spring 23 until the intake valve member 17 has pressed the underlying diaphragm portion into sealing engagement with the intake valve seat 12 to close the intake passage 9.
  • the valve-actuating lever 19 is then pivoted further in the anticlockwise direction about the pivot 20 by the spring 23 so that the delivery valve member 18 is lifted in opposition to the spring 24 to open the delivery passage 10.
  • the slide plate 32 continues its upward travel until it reaches its top dead center when the eccentric pin 30 enters the arcuate portion 34 of the upper edge 35 of the slot 31.
  • This overtravel is accommodated by the driver spring 37 and ensures that the piston is always arrested in an accurately defined upper end position irrespective of any backlash. Since both end positions of the piston are always accurately defined, an exact predetermined volume of liquid is dispensed during each dispensing cycle.
  • the cam follower 25 disengages the cam disc section 29 and engages the cam disc section 28 to cause the push rod 22 to pivot the cam-actuating lever 19 in the clockwise direction to permit the spring 24 to close the delivery valve 13, 18 and then to lift the intake valve body 17 and the underlying diaphragm portion from the intake valve seat 12 so that the intake passage 9 is opened and the next dispensing cycle may commence.
  • the valve positions are reversed while the slide plate 32 and the piston 2 are held stationary.
  • a device for repeatedly dispensing a predetermined quantity of liquid comprising: a reciprocating pump having a pump cylinder providing a variable volume pump chamber and a reciprocable piston in said pump cylinder;
  • a flexible imperforate diaphragm positioned on said external surface of said first valve block to overlie said valve seats and sealingly engage portions of said external surface surrounding said valve seats;
  • valve members in said second valve block, said valve members being adapted to act on said flexible diaphragm on the side thereof facing said second valve block, thereby to cause said flexible diaphragm to engage said valve seats to close said passages;
  • valve-actuating means for displacing said valve members towards and away from said valve seats.
  • a device including an actuating lever for said valve members, said actuating lever being pivoted to said valve members at spaced points and biased to keep said intake valve member in a closed position and said delivery valve member in an open position.
  • a device including means for operatively connecting said actuating lever with a rotatable cam disc having an eccentrically positioned driver pin and a reciprocable slide operatively connected with said piston to reciprocate it in said pump cylinder, said slide having a slotand-pin connection with said cam disc including a slot extending transversely of the direction of reciprocation of said slide and engaging over said driver pin.
  • a device wherein means is provided for continuously rotating said cam disc and driver pin during the course of a dispensing cycle comprising an intake and a delivery stroke of said piston and wherein said slot-and-pin connection between said cam disc and said slide plate includes lost-motion means for effecting an abrupt discontinuance of said delivery stroke and a rest period of said piston between said delivery and said intake strokes.
  • said lost-motion means includes resilient means permitting slight overtravel of said slide past the end positions of said piston.
  • a device wherein means is provided for continuously rotating said cam disc and driver pin during the course of a dispensing cycle comprising an intake and a delivery stroke of said piston and wherein said slot-and-pin connection between said cam disc and said slide plate includes second lost-motion means for effecting an abrupt discontinuance of the movement of said slide at the end of said delivery stroke.
  • a device in which said pump cylinder and said piston cooperate to provide said variable pump chamber.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
US789892A 1968-01-12 1969-01-08 Liquid-dispensing device Expired - Lifetime US3565298A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE00403/68A SE327098B (enrdf_load_html_response) 1968-01-12 1968-01-12

Publications (1)

Publication Number Publication Date
US3565298A true US3565298A (en) 1971-02-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
US789892A Expired - Lifetime US3565298A (en) 1968-01-12 1969-01-08 Liquid-dispensing device

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US (1) US3565298A (enrdf_load_html_response)
GB (1) GB1204103A (enrdf_load_html_response)
SE (1) SE327098B (enrdf_load_html_response)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729256A (en) * 1971-01-18 1973-04-24 Grace W R & Co Assembly for polymeric dispensing
FR2447013A1 (fr) * 1979-01-17 1980-08-14 Arenco Ab Dispositif de dosage volumetrique
US4826050A (en) * 1984-11-28 1989-05-02 Murphy Allan P Spraying and dosing apparatus
US4896797A (en) * 1989-01-17 1990-01-30 Tumlin Bruce A Seed stick
US4915264A (en) * 1988-02-05 1990-04-10 Curtis David C Portion control apparatus
EP1074735A3 (fr) * 1999-08-02 2001-08-22 Lütolf Anton Pompe à piston actionnée par excentriques réglables
US20040255512A1 (en) * 2003-06-18 2004-12-23 Burgess Philip David Japanese knotweed injector system
WO2005003559A1 (de) * 2003-07-02 2005-01-13 Gerhard Winiger Kolbenpumpe
WO2021154556A1 (en) * 2020-01-31 2021-08-05 Becton, Dickinson And Company Valve shaft pump with coordinated pumping and valving operations
US11255316B2 (en) * 2018-02-15 2022-02-22 Jacobsen Innovations, Inc. Pump

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DK136378A (da) 1978-03-28 1979-09-29 Foss A S Doseringspumpe
US4303376A (en) * 1979-07-09 1981-12-01 Baxter Travenol Laboratories, Inc. Flow metering cassette and controller
JPS5985665A (ja) * 1982-09-13 1984-05-17 イメツド・コ−ポレ−シヨン 患者への流体供給装置および方法
US4687426A (en) * 1984-07-31 1987-08-18 Fuji Techno Kogyo Kabushiki Kaisha Constant volume pulsation-free reciprocating pump

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881958A (en) * 1956-07-23 1959-04-14 Milton Roy Co System with plural-way valve for metering fluid
US3011685A (en) * 1957-11-27 1961-12-05 Milton Roy Co System with leakproof plural-way ball valve
US3149753A (en) * 1962-01-08 1964-09-22 Courtesy Products Corp Liquid dispensing machine
GB983634A (en) * 1961-07-05 1965-02-17 Ignace Giacomini Liquid dispensing means

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2881958A (en) * 1956-07-23 1959-04-14 Milton Roy Co System with plural-way valve for metering fluid
US3011685A (en) * 1957-11-27 1961-12-05 Milton Roy Co System with leakproof plural-way ball valve
GB983634A (en) * 1961-07-05 1965-02-17 Ignace Giacomini Liquid dispensing means
US3149753A (en) * 1962-01-08 1964-09-22 Courtesy Products Corp Liquid dispensing machine

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3729256A (en) * 1971-01-18 1973-04-24 Grace W R & Co Assembly for polymeric dispensing
FR2447013A1 (fr) * 1979-01-17 1980-08-14 Arenco Ab Dispositif de dosage volumetrique
US4352444A (en) * 1979-01-17 1982-10-05 Norden Packaging Machinery Aktiebolag Controllable volume dosing device
US4826050A (en) * 1984-11-28 1989-05-02 Murphy Allan P Spraying and dosing apparatus
US4915264A (en) * 1988-02-05 1990-04-10 Curtis David C Portion control apparatus
US4896797A (en) * 1989-01-17 1990-01-30 Tumlin Bruce A Seed stick
EP1074735A3 (fr) * 1999-08-02 2001-08-22 Lütolf Anton Pompe à piston actionnée par excentriques réglables
US7165357B2 (en) 2003-06-18 2007-01-23 Philip David Burgess Japanese knotweed injector system
US20040255512A1 (en) * 2003-06-18 2004-12-23 Burgess Philip David Japanese knotweed injector system
US20070180765A1 (en) * 2003-06-18 2007-08-09 Phillip Burgess Japanese knotweed injector system
US7555864B2 (en) 2003-06-18 2009-07-07 Phillip Burgess Japanese knotweed injector system
US7805884B2 (en) * 2003-06-18 2010-10-05 Phillip Burgess Japanese knotweed injector system
EA007695B1 (ru) * 2003-07-02 2006-12-29 Герхард Винигер Поршневой насос
WO2005003559A1 (de) * 2003-07-02 2005-01-13 Gerhard Winiger Kolbenpumpe
US12258959B2 (en) 2018-02-15 2025-03-25 Jacobsen Innovations, Inc. Valves
US11255316B2 (en) * 2018-02-15 2022-02-22 Jacobsen Innovations, Inc. Pump
WO2021154556A1 (en) * 2020-01-31 2021-08-05 Becton, Dickinson And Company Valve shaft pump with coordinated pumping and valving operations
US20230064224A1 (en) * 2020-01-31 2023-03-02 Becton, Dickinson And Company Valve shaft pump with coordinated pumping and valving operations
JP2023512261A (ja) * 2020-01-31 2023-03-24 ベクトン・ディキンソン・アンド・カンパニー ポンピングおよびバルブ操作を備えたバルブシャフトポンプ
CN115190807B (zh) * 2020-01-31 2024-06-04 贝克顿·迪金森公司 具有协调泵送和阀调操作的阀轴泵
CN115190807A (zh) * 2020-01-31 2022-10-14 贝克顿·迪金森公司 具有协调泵送和阀调操作的阀轴泵

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Publication number Publication date
SE327098B (enrdf_load_html_response) 1970-08-10
GB1204103A (en) 1970-09-03

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